Detection method and detection system for diagonal pulling of heavy crane hook

文档序号：126260 发布日期：2021-10-22 浏览：26次中文

阅读说明：本技术 重型吊车吊钩斜拉的检测方法及检测系统 (Detection method and detection system for diagonal pulling of heavy crane hook ) 是由陈明旭王梓宇于 2021-07-27 设计创作，主要内容包括：本发明提供了一种重型吊车吊钩斜拉的检测方法及检测系统,实时获取吊臂顶端和吊钩顶端中心位置的卫星信号和方向信息；实时获取驾驶舱位置的卫星信号以及方向信息,并根据所述卫星信号生成实时的RTK差分数据；根据吊臂顶端和吊钩顶端中心位置的卫星信号和RTK差分数据,分别生成吊臂顶端和吊钩顶端中心位置相对于驾驶舱位置的定位信息；根据吊臂顶端和吊钩顶端中心位置的定位信息,确定目标点,得到吊钩目标点相对于吊臂顶端的垂直投影的相对位置,同时通过吊臂和吊钩顶端的方向信息,得到吊臂的旋转角度和吊钩的姿态信息,获得二维的雷达图。本发明实现提高施工效率,节省额外的沟通成本和人工成本,大幅度降低发生斜拉侧翻的概率。(The invention provides a detection method and a detection system for diagonal pulling of a heavy crane hook, which are used for acquiring satellite signals and direction information of the top end of a suspension arm and the center position of the top end of the hook in real time; acquiring satellite signals and direction information of the position of a cockpit in real time, and generating real-time RTK differential data according to the satellite signals; respectively generating positioning information of the central positions of the top end of the suspension arm and the top end of the lifting hook relative to the position of the cockpit according to the satellite signals and the RTK differential data of the central positions of the top end of the suspension arm and the top end of the lifting hook; and determining a target point according to the positioning information of the top end of the suspension arm and the center position of the top end of the lifting hook, obtaining the relative position of the lifting hook target point relative to the vertical projection of the top end of the suspension arm, simultaneously obtaining the rotation angle of the suspension arm and the attitude information of the lifting hook according to the direction information of the top ends of the suspension arm and the lifting hook, and obtaining a two-dimensional radar map. The invention improves the construction efficiency, saves additional communication cost and labor cost, and greatly reduces the probability of diagonal pulling and side turning.)

1. A method for detecting inclined pulling of a heavy crane hook is characterized by comprising the following steps:

acquiring satellite signals of the center position of the top end of the suspension arm and direction information of the top end of the suspension arm in real time;

acquiring satellite signals of the center position of the top end of the lifting hook and direction information of the top end of the lifting hook in real time;

acquiring satellite signals and direction information of a position of a cockpit in real time, and generating real-time RTK differential data according to the satellite signals of the position of the cockpit;

generating positioning information of the central position of the top end of the suspension arm relative to the position of the cockpit according to the satellite signal of the central position of the top end of the suspension arm and the RTK differential data;

generating positioning information of the central position of the top end of the lifting hook relative to the position of the cockpit according to the satellite signal of the central position of the top end of the lifting hook and the RTK differential data;

respectively determining the position information of a boom target point and a lifting hook target point according to the positioning information of the top center position of the boom and the top center position of the lifting hook and the direction information of the top end of the boom and the top end of the lifting hook;

and obtaining the relative position of the lifting hook target point relative to the vertical projection of the top end of the suspension arm according to the position information of the suspension arm target point and the lifting hook target point, obtaining the rotation angle of the suspension arm and the attitude information of the lifting hook according to the direction information of the top end of the suspension arm and the top end of the lifting hook, further obtaining a two-dimensional radar map, and finishing the detection of the inclined pulling of the lifting hook of the crane.

2. The method for detecting the diagonal pulling of the lifting hook of the heavy duty crane according to claim 1, wherein the obtaining of the satellite signal of the central position of the top end of the suspension arm and the direction information of the top end of the suspension arm comprises:

installing a suspension arm positioning system at the center position of the top end of the suspension arm, wherein the obtained satellite signal of the suspension arm positioning system is the satellite signal of the center position of the top end of the suspension arm;

arranging a main antenna on one side edge of the top end of the suspension arm and arranging a slave antenna on the other side edge of the top end of the suspension arm opposite to the main antenna in a master-slave antenna mode, so that a connecting line between the main antenna and the slave antenna just passes through the central point of the top end of the suspension arm, and acquiring direction information from the main antenna to the slave antenna, namely the direction information of the top end of the suspension arm;

the direction information includes: the angle between the projection of the vector line from the main antenna to the auxiliary antenna on the horizontal plane and the true north direction of the earth is a deflection angle, and the angle between the vector line and the horizontal plane of the earth is a pitch angle.

3. The method for detecting the diagonal tension of the heavy-duty crane hook according to claim 1, wherein the obtaining of the satellite signal of the center position of the top end of the hook and the direction information of the top end of the hook comprises:

installing a lifting hook positioning system at the center position of the top end of the lifting hook, wherein the obtained satellite signal of the lifting hook positioning system is the satellite signal of the center position of the top end of the lifting hook;

arranging a main antenna on one side edge of the top end of the lifting hook and arranging a slave antenna on the other side edge of the top end of the lifting hook opposite to the main antenna in a master-slave antenna mode, so that a connecting line between the main antenna and the slave antenna just passes through the central point of the top end of the lifting hook, and acquiring direction information from the main antenna to the slave antenna, namely the direction information of the top end of the lifting hook;

4. The method for detecting the diagonal pulling of the heavy crane hook according to claim 1, wherein the step of acquiring the satellite signal and the direction information of the position of the cockpit in real time and generating real-time RTK differential data according to the satellite signal of the position of the cockpit comprises the steps of:

installing a base station system at any open position at the top of a cockpit to acquire a satellite signal and sending RTK differential data through a radio station;

the method comprises the steps that a main antenna is arranged at the position, close to the back, of the top of a cockpit in a main-auxiliary antenna mode, a slave antenna is arranged at the position, close to the front, of the top of the cockpit, a vector line formed by the main antenna and the slave antenna is overlapped with the direction opposite to the center of the view field of the cockpit, and the direction information from the main antenna to the slave antenna is obtained and is the direction information of the position of the cockpit;

the direction information includes: the direction in which the master and slave antennas are pointed.

5. The method for detecting the diagonal pulling of the heavy crane hook according to claim 1, wherein the step of generating the positioning information of the central position of the top end of the boom relative to the position of the cockpit according to the satellite signal of the central position of the top end of the boom and the RTK differential data comprises:

calculating the carrier phase of the satellite signal at the top center position of the suspension arm and the carrier phase of the RTK differential data to obtain a phase differential observation value;

processing the phase difference observation value in real time to obtain positioning information of centimeter-level positioning accuracy, namely positioning information of the center position of the top end of the suspension arm relative to the position of the cockpit;

the generating of the positioning information of the central position of the top end of the lifting hook relative to the position of the cockpit according to the satellite signal of the central position of the top end of the lifting hook and the RTK differential data comprises:

calculating the carrier phase of the satellite signal at the center position of the top end of the lifting hook and the carrier phase of the RTK differential data to obtain a phase differential observation value;

and processing the phase difference observation value in real time to obtain positioning information of centimeter-level positioning accuracy, namely positioning information of the center position of the top end of the lifting hook relative to the position of the cockpit.

6. The method for detecting the diagonal tension of the heavy-duty crane hook according to claim 1, wherein the method for determining the position information of the target point of the boom and the target point of the hook respectively according to the positioning information of the center position of the top end of the boom and the center position of the top end of the hook and the direction information of the top end of the boom and the top end of the hook adopts a virtual point positioning method, comprising the following steps:

the lifting hook target point is positioned at the position of a lifting hook, and the direction information of the top end of the lifting hook is obtained in a master-slave antenna mode; calculating the position information of the lifting hook target point as follows:

A1(X)＝P1(X)+d1×cosβ1×cosα1

A1(Y)＝P1(Y)+d1×cosβ1×sinα1

A1(Z)＝P1(Z)+l1×sinβ1

wherein, a1(X), a1(Y), a1(Z) are position coordinates of a hook target point, P1(X), P1(Y), P1(Z) are position coordinates of a hook main antenna for obtaining hook top end direction information, d1 is a horizontal distance from the hook main antenna to a hook top end central point, l1 is a vertical distance from the hook top end central point to the hook target point, α 1 is a deflection angle of a hook main and auxiliary antenna extension line, and β 1 is a pitch angle of the hook main and auxiliary antenna extension line;

the suspension arm target point is positioned below the suspension arm pulley block and connected with the acquisition point, and the direction information of the top end of the suspension arm is obtained in a master-slave antenna mode; calculating the position information of the suspension arm target point as follows:

A2(X)＝P2(X)+d2×cosβ2×cosα2

A2(Y)＝P2(Y)+d2×cosβ2×sinα2

A2(Z)＝P2(Z)+l2×sinβ2

a2(X), A2(Y) and A2(Z) are position coordinates of a boom target point, P2(X), P2(Y) and P2(Z) are position coordinates of a boom main antenna used for obtaining boom top end direction information, d2 is a horizontal distance from the boom main antenna to a boom top end central point, l2 is a vertical distance from the boom top end central point to the boom target point, alpha 2 is a deflection angle of a boom main and auxiliary antenna extension line, and beta 2 is a pitch angle of the boom main and auxiliary antenna extension line.

7. The method for detecting the diagonal tension of the heavy-duty crane hook according to claim 1, wherein the obtaining of the relative position of the hook target point with respect to the vertical projection of the top end of the boom according to the position information of the boom target point and the hook target point comprises:

subtracting the position information of the boom target point from the position information of the hook target point to obtain the position information of the hook target point relative to the boom target point;

subtracting a vertical error from the obtained position information of the lifting hook target point relative to the suspension arm target point, and projecting the position information onto a two-dimensional plane to obtain two-dimensional plane positioning information, namely the relative position of the lifting hook target point relative to the vertical projection of the top end of the suspension arm; wherein the vertical error comprises: the vertical distance from the center point of the top end of the lifting hook to a lifting hook target point and the vertical distance from the center point of the top end of the lifting arm to a lifting arm target point;

the rotation angle of the suspension arm and the attitude information of the lifting hook are obtained according to the direction information of the top end of the suspension arm and the top end of the lifting hook, and the method comprises the following steps:

according to the direction information of the top end of the suspension arm and the top end of the lifting hook, obtaining an included angle between the projection of the vector line of the direction information of the top end of the lifting hook relative to the earth horizontal plane and the projection of the vector line of the direction information of the top end of the suspension arm relative to the earth horizontal plane, namely the rotation angle of the suspension arm;

according to the direction information of the top end of the lifting hook, an included angle between the projection of the vector line of the direction information of the top end of the lifting hook on the horizontal plane and the true north direction of the earth, namely a deflection angle, and an included angle between the vector line of the direction information of the top end of the lifting hook and the horizontal plane of the earth, namely a pitch angle are obtained;

obtaining current attitude information of the lifting hook based on the deflection angle and the pitch angle;

and combining the relative position of the hook target point relative to the vertical projection of the top end of the suspension arm, the rotation angle of the suspension arm and the attitude information of the hook to obtain a two-dimensional radar map.

8. The method of claim 1, further comprising:

according to the direction information of the position of the cockpit, obtaining the angle of the direction opposite to the cockpit, and correcting the direction angle of the obtained two-dimensional radar map, wherein the correction comprises the following steps:

according to the direction information of the position of the cockpit, obtaining an included angle between the projection of the direction information on the horizontal plane and the true north direction of the earth, and obtaining the angle of the direction opposite to the cockpit;

and according to the angle of the direction opposite to the cockpit, rotating the plane coordinate system of the two-dimensional radar chart as follows:

X′＝X*cos(θ)-Y*sin(θ)

Y′＝X*sin(θ)-Y*cos(θ)

wherein, (X, Y) is X-axis and Y-axis coordinates under an original plane coordinate system, (X ', Y') is X-axis and Y-axis coordinates under a plane coordinate system after rotation, namely position information after direction angle correction is carried out on a two-dimensional radar map, and 0 is an angle of a direction opposite to a cockpit;

and the direction pointed by the Y axis of the rotated plane coordinate system is superposed with the direction information of the position of the cockpit, so that the correction of the direction angle of the two-dimensional radar chart is completed.

9. The utility model provides a heavy crane lifting hook draws detecting system to one side which characterized in that includes:

the base station system module is used for acquiring satellite signals and direction information of a cockpit position in real time and generating real-time RTK differential data according to the satellite signals of the cockpit position;

the suspension arm positioning system module is used for acquiring a satellite signal of the central position of the top end of the suspension arm and direction information of the top end of the suspension arm in real time and generating positioning information of the central position of the top end of the suspension arm relative to the position of the cockpit according to the satellite signal of the central position of the top end of the suspension arm and the RTK differential data;

the lifting hook positioning system module is used for acquiring a satellite signal of the central position of the top end of the lifting hook and direction information of the top end of the lifting hook in real time, and generating positioning information of the central position of the top end of the lifting hook relative to the position of the cockpit according to the satellite signal of the central position of the top end of the lifting hook and the RTK differential data;

the information processing system module is used for respectively determining the position information of a suspension arm target point and a lifting hook target point according to the positioning information of the top center position of the suspension arm and the top center position of the lifting hook and the direction information of the top end of the suspension arm and the top end of the lifting hook; and obtaining the relative position of the lifting hook target point relative to the vertical projection of the top end of the suspension arm according to the position information of the suspension arm target point and the lifting hook target point, obtaining the rotation angle of the suspension arm and the attitude information of the lifting hook according to the direction information of the top end of the suspension arm and the top end of the lifting hook, further obtaining a two-dimensional radar map, and finishing the detection of the inclined pulling of the lifting hook of the crane.

10. The heavy duty crane hook diagonal draw detection system of claim 9, further comprising any one or more of the following:

-the base station system module comprising: the base station comprises a base station module, a base station main antenna and a base station slave antenna; the base station module is arranged on the cockpit and used for acquiring satellite signals and sending RTK differential data to the suspension arm positioning system module and the lifting hook positioning system module through a radio station; the base station main antenna is arranged at the position close to the back of the top of the cockpit, the base station slave antenna is arranged at the position close to the front of the top of the cockpit, a vector line formed by the base station main antenna and the base station slave antenna is superposed with the direction opposite to the center of the view field of the cockpit, and the base station module acquires direction information from the base station main antenna to the base station slave antenna and sends the direction information to the information processing system module;

-the boom positioning system module, comprising: the suspension arm positioning module, the suspension arm positioning main antenna and the suspension arm positioning slave antenna are arranged on the base; the suspension arm positioning module is arranged at the central position of the top end of the suspension arm and used for receiving the RTK differential data, carrying out differential calculation according to a satellite signal of the suspension arm positioning module, obtaining positioning information relative to the base station module and sending the positioning information to the information processing system module; the suspension arm positioning main antenna is arranged on one side edge of the top end of the suspension arm, the suspension arm positioning slave antenna is arranged on the other side edge of the top end of the suspension arm opposite to the suspension arm positioning main antenna, so that a connecting line between the main antenna and the slave antenna just passes through the central point of the top end of the suspension arm, and the suspension arm positioning module acquires direction information from the suspension arm positioning main antenna to the suspension arm positioning slave antenna and sends the direction information to the information processing system module;

-the hook positioning system module comprising: the lifting hook positioning module, the lifting hook positioning main antenna and the lifting hook positioning auxiliary antenna are arranged on the lifting hook positioning module; the lifting hook positioning module is arranged at the central position of the top end of the lifting hook and used for receiving the RTK differential data, carrying out differential solution according to a satellite signal of the lifting hook positioning module, obtaining positioning information relative to the base station module and sending the positioning information to the information processing system module; the main hook positioning antenna is arranged on the edge of one side of the top end of the hook, the auxiliary hook positioning antenna is arranged on the edge of the other side of the top end of the hook, which is opposite to the main hook positioning antenna, so that a connecting line between the main antenna and the auxiliary hook positioning antenna just passes through the central point of the top end of the hook, and the hook positioning module acquires direction information from the main hook positioning antenna to the auxiliary hook positioning antenna and sends the direction information to the information processing system module;

-further comprising a control terminal in communicative connection with the information handling system module;

the control terminal comprises a display module and a console; wherein:

the display module is used for displaying the two-dimensional radar map;

the console realizes any one or more of the following functions through the information processing system module:

-parameter adjustment of the base station system module, boom positioning system module and/or hook positioning system module;

-base station position calibration of the base station system module;

-setting the station frequency band;

-an alarm module is provided, wherein the alarm module presets a distance threshold value and gives an alarm when the diagonal distance of the lifting hook is greater than or equal to the distance threshold value;

-acquiring a current two-dimensional radar map in real time.

Technical Field

The invention relates to the technical field of diagonal tension monitoring of a heavy crane hook, in particular to a detection method and a detection system for diagonal tension of the heavy crane hook.

Background

During the operation of a large-scale crane, the general purpose is to obtain the approximate position of the lifting hook by the observation experience of a driver and the cooperation of external workers so as to adjust and control the general position, the obtained position information is not visual and accurate enough, the working efficiency is low, the timeliness is not enough, the communication is not smooth, the labor cost is high, and the like, so that the problem that the lifting hook is inclined to pull to cause the rollover of the crane occurs at times, and the great economic loss and the personal injury are caused.

Through search, the following results are found:

chinese patent invention entitled "milemeter GNSS combined construction tower crane and hoisting fixed-point lofting system" with publication number CN107140538B includes a cross arm, a lifting rope and a lifting hook, the construction tower crane cooperates with a hoisting fixed-point lofting auxiliary system, the hoisting fixed-point lofting auxiliary system includes a reference station, a monitoring device and a client terminal, the construction tower crane also includes: the mobile station is arranged on the cross arm and right above the lifting hook; the system comprises a base station, a mobile station, a monitoring device and a milemeter, wherein the base station is used for receiving GNSS satellite signals, acquiring approximate position information of the mobile station, receiving comprehensive error correction signals subjected to difference processing between satellites from a reference station, correcting the position of the mobile station, acquiring position information with centimeter-level precision, sending the position information to the monitoring device, the milemeter is used for acquiring the mileage of a lifting rope, and the monitoring device is used for determining the position of a lifting hook according to the mileage of the lifting rope and the position information of the mobile station. The system still has the following problems:

the central positions of a suspension arm and a lifting hook of the crane are a complex pulley block transmission device and a steel bar cable, and the installation of positioning modules at the central positions of the suspension arm and the lifting hook has great difficulty in engineering realization, can influence the normal operation of the cable and can also greatly influence the signal reception of an antenna, so that the prior art has no precedent for installing the positioning modules at the central positions of the suspension arm and the lifting hook. In addition, specific direction information including the rotation angle of the suspension arm and the attitude information of the lifting hook cannot be known by a simple positioning module, and the actual inclined pulling state of the lifting hook cannot be intuitively and accurately known.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a method and a system for detecting the inclined pulling of a heavy crane hook.

According to one aspect of the invention, a method for detecting the inclined pulling of a heavy-duty crane hook is provided, which comprises the following steps:

acquiring satellite signals of the center position of the top end of the suspension arm and direction information of the top end of the suspension arm in real time;

acquiring satellite signals of the center position of the top end of the lifting hook and direction information of the top end of the lifting hook in real time;

Preferably, the acquiring the satellite signal of the center position of the top end of the boom and the direction information of the top end of the boom includes:

Preferably, the acquiring the satellite signal of the center position of the top end of the hook and the direction information of the top end of the hook includes:

Preferably, the acquiring the satellite signal and the direction information of the position of the cockpit in real time, and generating real-time RTK differential data according to the satellite signal of the position of the cockpit includes:

installing a base station system at any open position at the top of a cockpit to acquire a satellite signal and sending RTK differential data through a radio station;

the direction information includes: the direction in which the master and slave antennas are pointed.

Preferably, the generating of the positioning information of the boom top center position relative to the position of the cockpit according to the satellite signal of the boom top center position and the RTK differential data includes:

Preferably, the determining the position information of the boom target point and the hook target point according to the positioning information of the boom top center position and the hook top center position and the direction information of the boom top and the hook top, respectively, and using a virtual point positioning method includes:

A1(X)＝P1(X)+d1×cosβ1×cosα1

A1(Y)＝P1(Y)+d1×cosβ1×sinα1

A1(Z)＝P1(Z)+l1×sinβ1

A2(X)＝P2(X)+d2×cosβ2×cosα2

A2(Y)＝P2(Y)+d2×cosβ2×sinα2

A2(Z)＝P2(Z)+l2×sinβ2

Preferably, the obtaining the relative position of the hook target point with respect to the vertical projection of the top end of the boom according to the position information of the boom target point and the hook target point includes:

obtaining current attitude information of the lifting hook based on the deflection angle and the pitch angle;

Preferably, the method further comprises:

and according to the angle of the direction opposite to the cockpit, rotating the plane coordinate system of the two-dimensional radar chart as follows:

X′＝X*cos(θ)-Y*sin(θ)

Y′＝X*sin(θ)-Y*cos(θ)

According to another aspect of the present invention, there is provided a heavy duty crane hook diagonal pull detection system comprising:

Preferably, the module of the base station system includes: the base station comprises a base station module, a base station main antenna and a base station slave antenna; the base station module is arranged on the cockpit and used for acquiring satellite signals and sending RTK differential data to the suspension arm positioning system module and the lifting hook positioning system module through a radio station; the base station main antenna is arranged at the position close to the back of the top of the cockpit, the base station slave antenna is arranged at the position close to the front of the top of the cockpit, a vector line formed by the base station main antenna and the base station slave antenna is overlapped with the center of the view field of the cockpit in the opposite direction, and the base station module acquires direction information from the base station main antenna to the base station slave antenna and sends the direction information to the information processing system module.

Preferably, the boom positioning system module comprises: the suspension arm positioning module, the suspension arm positioning main antenna and the suspension arm positioning slave antenna are arranged on the base; the suspension arm positioning module is arranged at the central position of the top end of the suspension arm and used for receiving the RTK differential data, carrying out differential calculation according to a satellite signal of the suspension arm positioning module, obtaining positioning information relative to the base station module and sending the positioning information to the information processing system module; the suspension arm positioning main antenna is arranged on one side edge of the top end of the suspension arm, the suspension arm positioning slave antenna is arranged on the other side edge of the top end of the suspension arm opposite to the suspension arm positioning main antenna, so that a connecting line between the main antenna and the slave antenna just penetrates through the central point of the top end of the suspension arm, and the suspension arm positioning module acquires direction information from the suspension arm positioning main antenna to the suspension arm positioning slave antenna and sends the direction information to the information processing system module.

Preferably, the hook positioning system module comprises: the lifting hook positioning module, the lifting hook positioning main antenna and the lifting hook positioning auxiliary antenna are arranged on the lifting hook positioning module; the lifting hook positioning module is arranged at the central position of the top end of the lifting hook and used for receiving the RTK differential data, carrying out differential solution according to a satellite signal of the lifting hook positioning module, obtaining positioning information relative to the base station module and sending the positioning information to the information processing system module; lifting hook location main antenna set up in on the side border on lifting hook top, the lifting hook location from the antenna set up in with on the opposite side border on the lifting hook top that lifting hook location main antenna is relative, make main antenna with from the central point on the lifting hook top is just passed to the line between the antenna, lifting hook orientation module acquires from lifting hook location main antenna to the direction information of lifting hook location from the antenna, and send to information processing system module.

Preferably, the system further comprises a control terminal, and the control terminal is in communication connection with the information processing system module;

the control terminal comprises a display module and a console; wherein:

the display module is used for displaying the two-dimensional radar map;

the console realizes any one or more of the following functions through the information processing system module:

-parameter adjustment of the base station system module, boom positioning system module and/or hook positioning system module;

-base station position calibration of the base station system module;

-setting the station frequency band;

-acquiring a current two-dimensional radar map in real time.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:

the detection method and the detection system for the inclined pulling of the heavy crane hook provided by the invention are convenient for a crane operator to know the state of the hook more visually, and greatly reduce the risk of the inclined pulling and side turning of the hook.

The detection method and the detection system for the inclined pulling of the heavy crane hook provided by the invention can improve the operation efficiency of the crane.

The detection method and the detection system for the inclined pulling of the heavy crane hook provided by the invention have the advantages that the labor cost is reduced, the unnecessary communication cost is reduced, and the risk cost caused by side turning is reduced.

The invention provides a detection method and a detection system for diagonal pulling of a heavy crane hook, which solve the problem of difficulty in mounting and positioning antennas at a target position of a suspension arm and the hook by adopting a double-antenna directional positioning technology and a virtual point positioning method.

The detection method and the detection system for the inclined pulling of the heavy crane hook ensure good signal receiving conditions.

The detection method and the detection system for the inclined pulling of the heavy crane hook can acquire the rotation angle of the suspension arm and the attitude information of the hook in real time, and can acquire the actual inclined pulling state of the hook more intuitively and accurately.

The detection method and the detection system for the inclined pulling of the heavy crane hook provided by the invention can improve the intelligent degree of the crane and further improve the brand competitiveness.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a flow chart of a method for detecting the diagonal tension of a heavy crane hook according to an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a system for diagonal tension detection of a hook of a heavy-duty crane according to an embodiment of the present invention; 101 is a base station main antenna, 102 is a base station slave antenna, 103 is a base station module, 201 is a boom positioning main antenna, 202 is a boom positioning slave antenna, 203 is a boom positioning module, 301 is a hook positioning main antenna, 302 is a hook positioning slave antenna, 303 is a hook positioning module, and 4 is an information processing system module.

Fig. 3 is a signal transmission diagram of a heavy duty crane hook diagonal pull detection system in accordance with a preferred embodiment of the present invention.

Fig. 4 is a schematic diagram of the hardware structure of the heavy duty crane hook diagonal tension detection system in a preferred embodiment of the present invention.

FIG. 5 is a schematic diagram of obtaining directional information for the position of the cockpit in a preferred embodiment of the present invention; wherein G is a top view of the top of the cockpit, V is a view field range of the cockpit, R is a view field opposite direction of the cockpit, namely a standard direction, 101 is a base station main antenna, 102 is a base station slave antenna, and 104 is a master-slave antenna vector line.

FIG. 6 is a two-dimensional plan view after projection in a preferred embodiment of the invention; wherein C is the projection of the lifting hook on the horizontal plane, x3 and y3 are coordinate information of the projection of the lifting hook on the horizontal plane, the central point is the projection of the top end of the suspension arm on the horizontal plane, and r is the offset distance of the lifting hook relative to the top end of the suspension arm on the horizontal plane.

FIG. 7 is a schematic diagram of a diagonal pulling state of a hook according to a preferred embodiment of the present invention; the point B is a target point at the top end of the suspension arm, the point C is a target point of the lifting hook in a swinging state, r is the length of the cable, and A is a target point of the hanging hook in a static state.

FIG. 8 is a schematic view of the directional information of the top end of the boom and the top end of the hook in a preferred embodiment of the present invention; wherein, alpha is an azimuth angle (deflection angle), beta is a pitch angle, and the true north direction is the direction formed by the intersection point of the earth horizontal plane and the north pole line.

FIG. 9 is a schematic diagram of the operation of acquiring a target point of the boom and a target point of the hook according to a preferred embodiment of the present invention; the antenna system comprises a suspension arm positioning main antenna 201, a suspension arm positioning slave antenna 202, a hook positioning main antenna 301, a hook positioning slave antenna S302, and a suspension arm F, wherein the suspension arm positioning main antenna S is the center position of the hook, and the suspension arm F is the center position of the suspension arm.

FIG. 10 is a schematic diagram of a yaw angle and a pitch angle when a target point is obtained according to a preferred embodiment of the present invention; wherein, P is the main antenna position, Q is the auxiliary antenna position, and A is the target point position.

Detailed Description

The following examples illustrate the invention in detail: the embodiment is implemented on the premise of the technical scheme of the invention, and a detailed implementation mode and a specific operation process are given. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Fig. 1 is a flowchart of a method for detecting a diagonal tension of a heavy crane hook according to an embodiment of the present invention.

As shown in fig. 1, the method for detecting the diagonal tension of the heavy crane hook provided by this embodiment may include the following steps:

s100, acquiring satellite signals of the center position of the top end of the suspension arm and the center position of the top end of the lifting hook and direction information of the top end of the suspension arm and the top end of the lifting hook in real time; acquiring satellite signals and direction information of the position of a cockpit in real time, and generating real-time RTK differential data according to the satellite signals of the position of the cockpit;

s200, generating positioning information of the central position of the top end of the suspension arm relative to the position of the cockpit according to the satellite signal of the central position of the top end of the suspension arm and the RTK differential data; generating positioning information of the central position of the top end of the lifting hook relative to the position of the cockpit according to the satellite signals of the central position of the top end of the lifting hook and the RTK differential data;

s300, respectively determining the position information of a boom target point and a hook target point according to the positioning information of the center position of the top end of the boom and the center position of the top end of the hook and the direction information of the top end of the boom and the top end of the hook;

s400, obtaining the relative position of the lifting hook target point relative to the vertical projection of the top end of the suspension arm according to the position information of the suspension arm target point and the lifting hook target point, obtaining the rotation angle of the suspension arm and the attitude information of the lifting hook according to the direction information of the top end of the suspension arm and the top end of the lifting hook, further obtaining a two-dimensional radar map, and completing the detection of the inclined pulling of the lifting hook of the crane.

In S100 of this embodiment, as a preferred embodiment, acquiring the satellite signal of the center position of the boom tip and the direction information of the boom tip may include the following steps:

s1011, mounting the suspension arm positioning system at the center position of the top end of the suspension arm, wherein the obtained satellite signal of the suspension arm positioning system is the satellite signal of the center position of the top end of the suspension arm;

s1012, arranging the main antenna on one side edge of the top end of the suspension arm and the slave antenna on the other side edge of the top end of the suspension arm opposite to the main antenna in a master-slave antenna mode, so that a connecting line between the main antenna and the slave antenna just penetrates through the central point of the top end of the suspension arm, and obtaining direction information from the main antenna to the slave antenna, namely the direction information of the top end of the suspension arm.

Further, as a preferred embodiment, the direction information of the boom tip includes: the angle between the projection of the vector line from the main antenna to the auxiliary antenna on the horizontal plane and the true north direction of the earth is a deflection angle, and the angle between the vector line and the horizontal plane of the earth is a pitch angle.

In S100 of this embodiment, as a preferred embodiment, the acquiring the satellite signal of the center position of the hook tip and the direction information of the hook tip may include the following steps:

s1021, installing the lifting hook positioning system at the center position of the top end of the lifting hook, wherein the obtained satellite signal of the lifting hook positioning system is the satellite signal of the center position of the top end of the lifting hook;

and S1022, arranging the main antenna on one side edge of the top end of the lifting hook and the slave antenna on the other side edge of the top end of the lifting hook opposite to the main antenna in a master-slave antenna mode, so that a connecting line between the main antenna and the slave antenna just passes through the central point of the top end of the lifting hook, and acquiring direction information from the main antenna to the slave antenna, namely the direction information of the top end of the lifting hook.

Further, as a preferred embodiment, the direction information of the top end of the hook includes: the angle between the projection of the vector line from the main antenna to the auxiliary antenna on the horizontal plane and the true north direction of the earth is a deflection angle, and the angle between the vector line and the horizontal plane of the earth is a pitch angle.

In S100 of this embodiment, as a preferred embodiment, acquiring the satellite signal and the direction information of the cockpit position in real time, and generating the real-time RTK differential data according to the satellite signal of the cockpit position may include the following steps:

s1031, mounting the base station system at any open position at the top of the cockpit to acquire a satellite signal, and sending RTK differential data through a radio station;

s1032, arranging the main antenna at the position close to the back of the top of the cockpit in the open air and arranging the auxiliary antenna at the position close to the front of the top of the cockpit in the open air in a master-slave antenna mode, wherein a vector line formed by the main antenna and the auxiliary antenna is overlapped with the direction opposite to the center of the view field of the cockpit, and acquiring direction information from the main antenna to the auxiliary antenna, namely the direction information of the position of the cockpit.

Further, as a preferred embodiment, the direction information of the position of the cockpit includes: the direction in which the master and slave antennas point (the direction directly opposite to the center of the cockpit visual field is also the direction in which the master and slave antennas of the base station point, and is also the direction in which the front of the two-dimensional radar chart points).

In S200 of this embodiment, as a preferred embodiment, generating positioning information of the boom tip center position relative to the cockpit position according to the satellite signal of the boom tip center position and the RTK differential data may specifically include the following steps:

s2011, calculating a carrier phase of the satellite signal at the top center position of the suspension arm and a carrier phase of the RTK differential data to obtain a phase differential observation value; s2012, the phase difference observed value is processed in real time to obtain positioning information of centimeter-level positioning accuracy, namely the positioning information of the center position of the top end of the suspension arm relative to the position of the cockpit.

In S200 of this embodiment, as a preferred embodiment, generating the positioning information of the hook tip center position relative to the position of the cockpit according to the satellite signal of the hook tip center position and the RTK differential data may specifically include the following steps:

s2021, calculating a carrier phase of the satellite signal at the center position of the top end of the lifting hook and a carrier phase of the RTK differential data to obtain a phase differential observation value;

and S2022, processing the phase difference observed value in real time to obtain positioning information of centimeter-level positioning accuracy, namely positioning information of the center position of the top end of the lifting hook relative to the position of the cockpit.

In S300 of this embodiment, as a preferred embodiment, the method for determining the position information of the boom target point and the hook target point respectively according to the positioning information of the boom top center position and the hook top center position and the direction information of the boom top end and the hook top end, and using the virtual point positioning method, may include the following steps:

s30a, a hook target point is located at the hook position of the hook, and the direction information of the top end of the hook is obtained in a master-slave antenna mode; the position information of the hook target point is calculated as follows:

A1(X)＝P1(X)+d1×cosβ1×cosα1

A1(Y)＝P1(Y)+d1×cosβ1×sinα1

A1(Z)＝P1(Z)+l1×sinβ1

wherein, a1(X), a1(Y), a1(Z) are position coordinates of a hook target point, P1(X), P1(Y), P1(Z) are position coordinates of a hook main antenna for obtaining information of a hook top end direction, d1 is a horizontal distance from the hook main antenna to a hook top end central point, l1 is a vertical distance from the hook top end central point to the hook target point, α 1 is a deflection angle of a hook main and auxiliary antenna extension line, and β 1 is a pitch angle of the hook main and auxiliary antenna extension line;

s30b, the boom target point is located below the boom pulley block and connected with the acquisition point, and the direction information of the boom top is obtained in a master-slave antenna mode; the position information of the boom target point is calculated as follows:

A2(X)＝P2(X)+d2×cosβ2×cosα2

A2(Y)＝P2(Y)+d2×cosβ2×sinα2

A2(Z)＝P2(Z)+l2×sinβ2

a2(X), A2(Y) and A2(Z) are position coordinates of a boom target point, P2(X), P2(Y) and P2(Z) are position coordinates of a boom main antenna used for obtaining information of the direction of the top end of the boom, d2 is the horizontal distance from the boom main antenna to the center point of the top end of the boom, l2 is the vertical distance from the center point of the top end of the boom to the boom target point, alpha 2 is the deflection angle of a boom main and slave antenna extension line, and beta 2 is the pitch angle of the boom main and slave antenna extension lines.

In S400 of this embodiment, as a preferred embodiment, obtaining the relative position of the vertical projection of the hook target point relative to the boom top according to the position information of the boom target point and the hook target point may include the following steps:

s4011, subtracting the position information of the boom target point from the position information of the hook target point to obtain the position information of the hook target point relative to the boom target point;

s4012, subtracting a vertical error from the obtained position information of the target point of the lifting hook relative to the target point of the suspension arm, and projecting the position information onto a two-dimensional plane to obtain two-dimensional plane positioning information, namely the relative position of the target point of the lifting hook relative to the vertical projection of the top end of the suspension arm; wherein the vertical error comprises: the vertical distance from the center point of the top end of the lifting hook to the target point of the lifting hook and the vertical distance from the center point of the top end of the suspension arm to the target point of the suspension arm.

In S400 of this embodiment, as a preferred embodiment, obtaining the rotation angle of the boom and the attitude information of the hook according to the direction information of the top end of the boom and the top end of the hook may include the following steps:

s4021, obtaining an included angle between the projection of the vector line of the direction information of the top end of the lifting hook relative to the earth horizontal plane and the projection of the vector line of the direction information of the top end of the lifting hook relative to the earth horizontal plane according to the direction information of the top end of the lifting hook and the direction information of the top end of the lifting hook, namely the rotation angle of the lifting arm;

s4022, obtaining an included angle between the projection of the vector line of the direction information of the top end of the lifting hook on the horizontal plane and the true north direction of the earth, namely a deflection angle, and an included angle between the vector line of the direction information of the top end of the lifting hook and the horizontal plane of the earth, namely a pitch angle, according to the direction information of the top end of the lifting hook;

s4023, obtaining the current attitude information of the lifting hook based on the deflection angle and the pitch angle.

In S400 of this embodiment, as a preferred embodiment, obtaining a two-dimensional radar map may include the following steps:

In this embodiment, as a preferred embodiment, the method may further include the steps of:

s500, obtaining an angle of a direction opposite to the cockpit according to the direction information of the position of the cockpit, and correcting the direction angle of the obtained two-dimensional radar map, may include the following steps:

s501, according to the direction information of the position of the cockpit, obtaining an included angle between the projection of the direction information on the horizontal plane and the true north direction of the earth, and obtaining the angle of the direction opposite to the cockpit;

s502, according to the angle of the direction opposite to the cockpit, the plane coordinate system of the two-dimensional radar chart is rotated as follows:

X′＝X*cos(θ)-Y*sin(θ)

Y′＝X*sin(θ)-Y*cos(θ)

wherein, (X, Y) is X-axis and Y-axis coordinates under the original plane coordinate system, (X ', Y') is X-axis and Y-axis coordinates under the plane coordinate system after rotation, and 0 is the angle of the direction opposite to the cockpit;

s503, the direction pointed by the Y axis of the rotated plane coordinate system is overlapped with the direction information of the position of the cockpit, and the correction of the direction angle of the two-dimensional radar chart is completed.

And theta is the direction angle opposite to the cockpit, and the position information X and Y of the original radar chart is substituted into the formula through the formula to obtain new position information X 'and Y', wherein the new position information is the position information obtained by correcting the two-dimensional radar chart direction angle.

Fig. 2 is a schematic structural diagram of a system for detecting diagonal tension of a heavy crane hook according to an embodiment of the present invention.

As shown in fig. 2, the detection system for diagonal pulling of the heavy-duty crane hook provided by this embodiment may include the following:

the base station system module is used for acquiring satellite signals and direction information of the position of the cockpit in real time and generating real-time RTK differential data according to the satellite signals of the position of the cockpit;

the information processing system module is used for respectively determining the position information of a suspension arm target point and a lifting hook target point according to the positioning information of the top center position of the suspension arm and the top center position of the lifting hook and the direction information of the top end of the suspension arm and the top end of the lifting hook; and obtaining the relative position of the lifting hook target point relative to the vertical projection of the top end of the suspension arm according to the position information of the suspension arm target point and the lifting hook target point, obtaining the rotation angle of the suspension arm and the attitude information of the lifting hook according to the direction information of the suspension arm and the lifting hook, further obtaining a two-dimensional radar map, and finishing the detection of the inclined pulling of the lifting hook of the crane.

In this embodiment, as a preferred embodiment, the module of the base station system may include: a base station module 103, a base station master antenna 101 and a base station slave antenna 102; the base station module is arranged on the cockpit and used for acquiring satellite signals and sending RTK differential data to the suspension arm positioning system module and the hook positioning system module through the radio station; the base station main antenna is arranged at the position close to the back of the top of the cockpit, the base station slave antenna is arranged at the position close to the front of the top of the cockpit, a vector line formed by the base station main antenna and the base station slave antenna is overlapped with the center of the view field of the cockpit in the opposite direction, and the base station module acquires direction information from the base station main antenna to the base station slave antenna and sends the direction information to the information processing system module.

In this embodiment, as a preferred embodiment, the boom positioning system module may include: a boom positioning module 203, a boom positioning master antenna 201 and a boom positioning slave antenna 202; the suspension arm positioning module is arranged at the central position of the top end of the suspension arm and used for receiving RTK differential data, carrying out differential solution according to a satellite signal of the suspension arm positioning module, obtaining positioning information relative to the base station module and sending the positioning information to the information processing system module; the suspension arm positioning main antenna is arranged on one side edge of the top end of the suspension arm, the suspension arm positioning slave antenna is arranged on the other side edge of the top end of the suspension arm opposite to the main antenna, so that a connecting line between the main antenna and the slave antenna just penetrates through the central point of the top end of the suspension arm, and the suspension arm positioning module acquires direction information from the suspension arm positioning main antenna to the suspension arm positioning slave antenna and sends the direction information to the information processing system module.

In this embodiment, as a preferred embodiment, the hook positioning system module may include: a hook positioning module 303, a hook positioning main antenna 301 and a hook positioning slave antenna 302; the lifting hook positioning module is arranged at the central position of the top end of the lifting hook and used for receiving RTK differential data, carrying out differential solution according to a satellite signal of the lifting hook positioning module, obtaining positioning information relative to the base station module and sending the positioning information to the information processing system module; hook location main antenna sets up on the border of one side on hook top, and the hook location is followed the antenna and is set up on the opposite side border on hook top relative with main antenna for main antenna just passes the central point on hook top with the line between the slave antenna, and hook orientation module acquires the direction information from hook location main antenna to hook location slave antenna, and sends to information processing system module.

In this embodiment, as a preferred embodiment, the system may further include a control terminal, where the control terminal is connected to the information processing system module in a communication manner;

the control terminal comprises a display module and a console; wherein:

the display module is used for displaying a two-dimensional radar map;

the console realizes any one or more of the following functions through the information processing system module:

-parameter adjustment of the base station system module, the boom positioning system module and/or the hook positioning system module;

-base station position calibration of the base station system module;

-setting a station frequency band;

an alarm module is provided, which presets a distance threshold value and gives an alarm when the diagonal distance of the hook is greater than or equal to the distance threshold value;

-acquiring a current two-dimensional radar map in real time.

The technical solutions provided by the above embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

The system for detecting the inclined pulling of the heavy crane hook provided by the embodiment of the invention mainly comprises four parts, as shown in fig. 2, including: the lifting arm positioning system module, the lifting hook positioning system module, the base station system module and the information processing system module.

The suspension arm positioning system module is mainly used for acquiring positioning information of the center position of the top end of the suspension arm and direction information of the top end of the suspension arm in real time and sending the information to the information processing system module in real time through the data transmission radio station.

The lifting hook positioning system module is mainly used for acquiring positioning information of the center position of the top end of the lifting hook and direction information of the top end of the lifting hook in real time and sending the information to the information processing system module in real time through the data transmission radio station.

The module of the base station system is arranged on a cockpit and mainly provides real-time RTK differential data for a boom top positioning system and a lifting hook positioning system to help the two positioning systems to perform high-precision positioning. Meanwhile, the orientation function (acquiring direction information) of the base station system module can assist the radar chart to correct the direction opposite to the cockpit in real time.

The information processing system module mainly acquires positioning data and orientation data (direction data) of the suspension arm positioning system module, the lifting hook positioning system module and the base station system module, performs unified processing, generates a radar map convenient for a driver to observe, and sends the radar map to the vehicle-mounted device system. And simultaneously, the configuration instruction received from the vehicle end is transmitted back to other three systems to carry out corresponding parameter configuration.

After the detection system is started, a base station system module acquires satellite signals and sends RTK differential data through a radio station, a suspension arm positioning system module and a lifting hook positioning system module simultaneously receive the differential data, differential calculation is carried out according to the satellite signals of the suspension arm positioning system module and the lifting hook positioning system module, high-precision positioning information relative to the base station is obtained, meanwhile, a pitch angle and a deflection angle of a vector line of a main antenna pointing to a slave antenna can be obtained through double antennas of the suspension arm positioning system module and the lifting hook positioning system module, the positioning system module sends positioning data and directional data to an information processing system module through the digital radio station, the information processing system module carries out calculation through a filtering algorithm, the relative position of a lifting hook target point relative to the vertical projection of the top end of a suspension arm is calculated, and meanwhile, the rotating angle of the suspension arm and the attitude information of the lifting hook can be calculated through the directional data. Meanwhile, the information processing system module also receives the direction information from the base station system module, calculates the angle of the direction opposite to the cockpit, corrects the direction angle of the radar map, and then sends the attitude information of the suspension arm and the lifting hook and the position information of the radar map to a vehicle-mounted terminal (control terminal) through a CAN bus. As shown in fig. 3.

The driver may configure some parameters of the detection system at the control terminal, including but not limited to alarm threshold, resolution, refresh frequency, station frequency band, operation mode selection (operation mode, wakeup mode, sleep mode), base station location calibration, etc. The CAN bus is transmitted to the information processing system module, and after the information processing system module identifies the instruction, other different modules are configured according to different instructions.

Fig. 4 is a schematic diagram of a hardware structure of a heavy-duty crane hook diagonal tension detection system according to a preferred embodiment of the present invention.

As shown in fig. 4, the system includes: the system comprises a suspension arm positioning system, a lifting hook positioning system, a base station system and an information processing system.

In the preferred embodiment, the boom positioning system comprises: the RTK radio comprises an RTK main antenna, an RTK slave antenna, an RTK radio antenna, a data return antenna, an RTK positioning board card, an RTK data transmission radio, a data return radio and a single-chip microcomputer processor.

Wherein:

the RTK master antenna is used to acquire position information and the RTK slave antenna provides a reference for direction information.

And the RTK positioning board card is used for resolving RTK differential data to acquire positioning and direction information.

An RTK data radio and antenna are used to receive RTK differential carrier data from the base station.

The single-chip microcomputer processor is used for processing RTK differential data, receiving positioning and orientation data of the positioning board card, transmitting the processed data back to the radio station through the data, and meanwhile, configuring main parameters of the radio station and the board card.

In the preferred embodiment, the hook positioning system comprises: the RTK radio comprises an RTK main antenna, an RTK slave antenna, an RTK radio antenna, a data return antenna, an RTK positioning board card, an RTK data transmission radio, a data return radio and a single-chip microcomputer processor.

The working principle of the RTK main antenna, the RTK slave antenna, the RTK radio antenna, the data return antenna, the RTK positioning board card, the RTK data transmission radio, the data return radio and the single-chip microcomputer processor is similar to that of the boom positioning system, and the details are not repeated here.

In the preferred embodiment, the base station system comprises an RTK main antenna, an RTK slave antenna, an RTK radio antenna, a data return antenna, an RTK positioning board, an RTK data transmission radio, a data return radio and a single-chip processor.

The working principle and the working process of the RTK main antenna, the RTK slave antenna, the RTK radio antenna, the data return antenna, the RTK positioning board card, the RTK data transmission radio, the data return radio and the single-chip processor are similar to those of the boom positioning system, and the details are not repeated here.

In the preferred embodiment, the information processing system includes: the lifting arm positioning system comprises a lifting arm positioning system data receiving antenna, a lifting arm positioning system data receiving radio station, a lifting hook positioning system data receiving antenna, a lifting hook positioning system data receiving radio station, a base station system data receiving antenna, a base station system data receiving radio station, a single chip processor and a CAN bus module.

Wherein:

the boom positioning system data receiving antenna and the radio station are used for receiving positioning and orientation data sent by the boom positioning system data return antenna, and meanwhile, a configuration instruction can be sent to carry out parameter configuration on the boom positioning system.

The hook positioning system data receiving antenna and the radio station are used for receiving positioning and orientation data sent by the hook positioning system data return antenna, and meanwhile, a configuration instruction can be sent to carry out parameter configuration on the hook positioning system.

The base station system data receiving antenna and the radio station are used for receiving positioning and orientation data sent by the base station system data return antenna, and meanwhile, a configuration instruction can be sent to carry out parameter configuration on the base station system.

The single-chip microcomputer processing system is mainly used for summarizing data received by the three radio stations, filtering and resolving the data to obtain radar information data, sending the radar information data to the CAN bus, receiving configuration instructions sent by the CAN bus, and sending the configuration instructions to the corresponding radio stations after resolving the configuration instructions.

The CAN bus module is mainly used for the bidirectional communication between the vehicle-mounted terminal and the information processing system.

In the preferred embodiment, the base station system transmits the carrier observations and the base station coordinate information to the boom and hook positioning system together in real time via the station data link. The suspension arm and lifting hook positioning system receives the carrier phase of the GPS satellite and the carrier phase from the base station system, and forms a phase difference observation value to process in real time, so that centimeter-level positioning accuracy is solved in real time.

The RTK differential data comprises carrier observed quantity and base station coordinate information. And (4) with the coordinate information of the base station as a reference, calculating the carrier observed quantity to obtain the position information of the suspension arm and the lifting hook target point.

Fig. 5 is a schematic diagram of obtaining direction information of the position of the cockpit in accordance with a preferred embodiment of the present invention.

As shown in fig. 5, the direction in which the driver sits in the cockpit and faces the field of view is set as a standard direction. The vector line formed by the master and slave antennas of the base station coincides with the standard direction. That is, the main antenna is mounted at a position closer to the rear of the cabin roof, and the sub antenna is mounted at a position closer to the front of the cabin roof.

Fig. 6 is a two-dimensional plan view after projection provided in a preferred embodiment of the present invention.

As shown in fig. 6, the y-axis direction is the direction directly opposite to the view line of the cockpit, and is also the direction in which the main antenna of the base station points to the slave antenna; the circle center is a projection point of the top end of the suspension arm on the horizontal plane; the point C is a projection point of the lifting hook target point on the horizontal plane; x3 and y3 are coordinate values of the point C on the two-dimensional plane; r is the distance from the point C to the circle center and is also the distance from the horizontal plane projection of the lifting hook to the horizontal plane projection of the top end of the suspension arm, and the larger the distance is, the more serious the inclined pulling degree of the lifting hook is.

Fig. 7 is a schematic diagram of a diagonal pulling state of the hook in the preferred embodiment of the invention.

As shown in fig. 7, the Z axis is the direction of the sky and coincides with the line of the weight; the Y-axis direction is the direction opposite to the visual line of the cockpit and is also the direction in which the main antenna of the base station points to the slave antenna; the point B is a target point at the top end of the suspension arm; the point C is a lifting hook target point in a swinging state; the point A is a lifting hook target point in a static state; r is the length of the cable.

FIG. 8 is a schematic view of the directional information of the boom tip and the hook tip in a preferred embodiment of the present invention.

As shown in fig. 8, a master-slave antenna mode is adopted, a master antenna is arranged on one side edge of the top end of a suspension arm or a lifting hook, a slave antenna is arranged on the other side edge of the top end opposite to the master antenna, so that a connecting line between the master antenna and the slave antenna just passes through the central point of the top end, and the direction information from the master antenna to the slave antenna is the required direction information, namely, the included angle between the projection of a vector line from the master antenna to the slave antenna on the horizontal plane and the true north direction of the earth, namely, the azimuth angle (deflection angle) and the included angle between the vector line and the horizontal plane of the earth, namely, the pitch angle are obtained.

As shown in fig. 9 and 10, after the information d1, l1, d2 and l2 is measured during installation, the precise position information of the boom target point F and the hook target point S can be calculated according to the position information of the main antenna and the direction information of the main and auxiliary antennas.

The position information of the hook target point S is calculated as follows:

A1(X)＝P1(X)+d1×cosβ1×cosα1

A1(Y)＝P1(Y)+d1×cosβ1×sinα1

A1(Z)＝P1(Z)+l1×sinβ1

wherein, A1(X), A1(Y) and A1(Z) are position coordinates of a hook target point S, P1(X), P1(Y) and P1(Z) are position coordinates of a hook main antenna, d1 is the horizontal distance from the hook main antenna to a center point N at the top end of the hook, l1 is the vertical distance from the center point N at the top end of the hook to the hook target point S, alpha 1 is the deflection angle of a hook main and auxiliary antenna extension line, and beta 1 is the pitch angle of the hook main and auxiliary antenna extension line;

the position information of the boom target point F is calculated as follows:

A2(X)＝P2(X)+d2×cosβ2×cosα2

A2(Y)＝P2(Y)+d2×cosβ2×sinα2

A2(Z)＝P2(Z)+l2×sinβ2

a2(X), A2(Y) and A2(Z) are position coordinates of a boom target point F, P2(X), P2(Y) and P2(Z) are position coordinates of a boom main antenna, d2 is the horizontal distance from the boom main antenna to a boom top center point M, l2 is the vertical distance from the boom top center point M to the boom target point F, alpha 2 is the deflection angle of a boom master-slave antenna extension line, and beta 2 is the pitch angle of the boom master-slave antenna extension line.

In this embodiment, error d is used to calculate the position of the target point on X, Y and error l is used to calculate the position of the target point on the Z axis. Wherein d1 and l1 are errors of the top end of the suspension arm, l2 and d2 are errors of the lifting hook, the data can be measured by a traditional measuring tool during installation, the accuracy can reach 1mm, and after the installation is finished, the parameters are always fixed without moving equipment.

In the preferred embodiment, positioning antennas do not need to be installed at the bottom end of the suspension arm and the target position of the hook, and target position information can be obtained only by extracting the position of the central point according to the vector line where the master antenna and the slave antenna are located.

When a large crane is used for carrying out corresponding work, for example, the hoisting of a wind generating set is carried out, the length of a suspension arm reaches hundreds of meters, an operator can hardly carry out accurate judgment by naked eyes, the auxiliary observation of many people is often needed, the communication is not smooth, the efficiency is low, and the side turning risk is easy to occur due to the inclined pulling of a lifting hook, so that the loss without estimation is brought. By adopting the scheme described by the invention, an operator can visually check the inclined pulling state of the lifting hook and the postures of the lifting arm and the lifting hook from the central control screen, each step of operation and control can be dynamically displayed on the screen in real time without additional workers for auxiliary observation, the efficiency is high, and the risk and the cost are greatly reduced.

The method and system for detecting the inclined pulling of the heavy crane hook provided by the embodiment of the invention adopt a high-precision positioning and orientation technology based on Real-time kinematic (RTK), carry out Real-time precise positioning on the relative position of the hook relative to the top end of the suspension arm, and can be displayed on a central control screen (display module) of a cockpit in a radar map form.

It should be noted that, the steps in the method provided by the present invention may be implemented by using corresponding modules, devices, units, and the like in the system, and those skilled in the art may implement the composition of the system by referring to the technical solution of the method, that is, the embodiment in the method may be understood as a preferred example for constructing the system, and will not be described herein again.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

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Detection method and detection system for diagonal pulling of heavy crane hook

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