阅读说明：本技术 安全模块、升降系统和起重机及其升降方法 (Safety module, lifting system, crane and lifting method of crane ) 是由 吴双生 关进军 马威 史向东 黄敏 于 2019-11-19 设计创作，主要内容包括：本发明涉及建筑机械技术领域,公开了一种安全模块、升降系统和起重机及其升降方法。所述安全模块包括用于固定在不同踏步(61)之间的从动件(111)和沿所述从动件(111)的长度延伸方向运动且和所述从动件(111)具有机械传动逆传动自锁性的主体部；所述主体部包括和所述从动件(111)形成运动副的主动件(112)。这样,利用主体部和所述从动件(111)的自锁特性,达到在顶升作业或者下降作业过程中出现故障的时能够起到自动保护、防止支撑在所述主体部上的负载突然下降的目的。(The invention relates to the technical field of construction machinery, and discloses a safety module, a lifting system, a crane and a lifting method of the crane. The safety module comprises a driven piece (111) fixed among different steps (61) and a main body part which moves along the length extension direction of the driven piece (111) and has mechanical transmission and inverse transmission self-locking performance with the driven piece (111); the main body portion includes a driving member (112) forming a kinematic pair with the driven member (111). Thus, the self-locking characteristic of the main body part and the driven part (111) is utilized, so that the purposes of automatic protection and sudden drop of the load supported on the main body part can be achieved when a fault occurs in the process of jacking operation or dropping operation.)

1. A safety module, characterized by comprising a driven member (111) for being fixed between different steps (61) and a main body part which can move along the length extension direction of the driven member (111) and has mechanical transmission reverse transmission self-locking property with the driven member (111); the main body portion includes a driving member (112) forming a kinematic pair with the driven member (111).

2. A security module according to claim 1, characterized in that the driving member (112) is rotationally advanced along the length extension of the driven member (111); the main body part comprises a speed reducing device (113) which is arranged between the driving part (112) and a first execution unit (114) for driving the driving part (112) to act and can follow the driving part (112) to move along the length extension direction of the driven part (111).

3. A lifting system is characterized by comprising a lifting mechanism (1) and a hydraulic station (3) for driving the lifting mechanism (1) to act; the lifting mechanism (1) comprises a first lifting mechanism (11) and a second lifting mechanism (12) which run synchronously; wherein the first lifting mechanism (11) comprises a safety module according to any of claims 1-2.

4. The lifting system according to claim 3, characterized by comprising a first execution unit (114) for driving the active member (112) to act and a second execution unit (121) for driving the second lifting mechanism (12) to act.

5. The lifting system according to claim 4, characterized in that the hydraulic station (3) comprises an oil pump (31) and a reversing valve (32) connected on an oil path between the oil pump (31) and the second actuator unit (121) for controlling the operating state of the second actuator unit (121); the second execution unit (121) and a pipeline connected between the second execution unit (121) and the reversing valve (32) form a first control oil path (33).

6. The lifting system according to claim 5, characterized in that the hydraulic station (3) comprises, in parallel with the first control circuit (33), a second control circuit (34) downstream of the reversing valve (32) for controlling the action of the first execution unit (114); the first execution unit (114) and a pipeline connected between the first execution unit (114) and the reversing valve (32) form a second control oil path (34).

7. The lifting system according to claim 4, characterized in that the driven member (111) comprises a first thread structure and the driving member (112) comprises a second thread structure screw-mounted on the first thread structure.

8. The lifting system according to claim 4, characterized in that the driven member (111) comprises a rack and the driving member (112) comprises a gear wheel meshing with the rack; the lifting system also comprises a worm gear reducer connected between the gear and the first execution unit (114) and used for driving the gear to act.

9. The lifting system according to claim 3, characterized in that it comprises a synchronization control unit (2) that calculates and sends commands to control the movement of the first lifting mechanism (11) according to the operating state of the second lifting mechanism (12) so as to synchronize the operation of the second lifting mechanism (12) and the first lifting mechanism (11).

10. The lifting system according to claim 9, characterized in that the synchronous control unit (2) comprises a controller (21) and a detection unit (22), the controller (21) being able to receive detection signals from the detection unit (22) to process and coordinate the synchronous movement of the first lifting mechanism (11) and the second lifting mechanism (12).

11. Crane, characterized in that it comprises at least one lifting system according to any one of claims 3-10 and a climbing frame (4) located in the upper part of the crane and being lifted using the lifting system.

12. A lifting method of a crane, characterized in that, when the crane according to claim 11 is used to start a lifting operation, the second lifting mechanism (12) drives the climbing frame (4) to ascend; the first lifting mechanism (11) and the second lifting mechanism (12) are synchronously started; at the moment, a first execution unit (114) for driving the active part (112) to act rotates along a first direction;

when the descending operation is started, the first lifting mechanism (11) and the second lifting mechanism (12) are synchronously started; at the moment, a first execution unit (114) for driving the active part (112) to act rotates along the direction opposite to the first direction.

Technical Field

The invention relates to the technical field of construction machinery, in particular to a safety module, a lifting system, a crane and a lifting method of the crane.

Background

In the building construction process, along with the height change of a building, the construction height of the tower crane needing to be constructed is adjusted to meet the operation requirement. At present, self-climbing tower cranes are all provided with jacking systems to increase or decrease the working height. In the leading-in and leading-out links of the standard knot of the self-climbing tower crane, the standard knot can be roughly divided into rope wheel type, chain wheel type, screw rod type, hydraulic type and other forms according to different transmission modes of a jacking mechanism, wherein the hydraulic jacking mechanism has the advantages of simple structure, reliable operation, stable lifting and the like, and is popular. However, the existing hydraulic jacking system mainly adopts a multi-cylinder jacking system to carry out jacking or descending operation; thus, when a component fault occurs during the jacking operation or the descending operation: for example, the oil pipe bursts, the sudden power failure, the internal leakage or the external leakage of the oil cylinder, even the cylinder explosion, the leakage of the hydraulic balance valve and the like; the jacking system cannot complete jacking operation or descending operation; the load supported by the jacking system can be instantly rubbed down to generate serious impact, so that the main body structure of the tower crane can be severely shaken; serious accidents can cause the tower crane to tip over. During the jacking operation or the descending operation, the operation can not be continued for various reasons; the lifted load is supported by the oil cylinder and is in an unreliable supporting state, and at the moment, in order to eliminate the danger, the lifting operation or the descending operation needs to be carried out by adopting an unconventional method to support all the loads on the steps on the standard section of the tower crane, so that the support can be reliable. At present, the unconventional method mainly adopts a manual pump to pump high-pressure oil to support a load on a step for jacking operation or descending operation, but the method is not timely. The load is supported on the step by adopting a method of adjusting the balance valve, which is unsafe and inconvenient. In order to solve the existing problems, there is a need for a new lifting system, by which the above problems can be overcome.

Disclosure of Invention

The invention aims to provide a tower crane, which adopts hydraulic drive to adjust the construction height according to the construction; when the construction height of the tower crane is adjusted, if the hydraulic station breaks down, the lifting system of the tower crane can prevent the load from being reliably supported and prevent the load from suddenly sliding downwards. In order to achieve the purpose, the invention provides a safety module which comprises a driven piece and a main body part, wherein the driven piece is used for being fixed between different steps, the main body part moves along the length extension direction of the driven piece and has mechanical transmission reverse transmission self-locking performance with the driven piece; the main body portion includes a driving member forming a kinematic pair with the driven member.

Further, the driving part rotates and advances along the length extending direction of the driven part; the main body part comprises a speed reducing device which is arranged between the driving part and a first execution unit for driving the driving part to move and can follow the driving part to move along the length extending direction of the driven part.

The invention provides a lifting system in a second aspect, which comprises a lifting mechanism and a hydraulic station for driving the lifting mechanism to act; the lifting mechanism comprises a first lifting mechanism and a second lifting mechanism which run synchronously; wherein, the first elevating system includes the above-mentioned safety module.

Furthermore, the lifting system comprises a first execution unit for driving the driving member to act and a second execution unit for driving the second lifting mechanism to act.

Further, the hydraulic station comprises an oil pump and a reversing valve which is connected to an oil path between the oil pump and the second execution unit and used for controlling the working state of the second execution unit; the second execution unit and a pipeline connected between the second execution unit and the reversing valve form a first control oil path.

Further, the hydraulic station comprises a second control oil path which is connected with the first control oil path in parallel and is used for controlling the action of the first execution unit at the downstream of the reversing valve; the first execution unit and a pipeline connected between the first execution unit and the reversing valve form a second control oil path.

Further, the driven member includes a first thread structure, and the driving member includes a second thread structure that is screw-mounted on the first thread structure.

Further, the driven part comprises a rack, and the driving part comprises a gear meshed with the rack; the lifting system further comprises a worm gear and worm reducer which is connected between the gear and the first execution unit and is used for driving the gear to act.

And the synchronous control unit calculates and sends instructions according to the working state of the second lifting mechanism to control the movement of the first lifting mechanism so as to enable the second lifting mechanism and the first lifting mechanism to synchronously operate.

Further, the synchronous control unit comprises a controller and a detection unit, and the controller can receive a detection signal from the detection unit to process and coordinate the synchronous movement of the first lifting mechanism and the second lifting mechanism.

The invention provides a crane, which comprises the lifting system and a climbing frame which is positioned at the upper part of the crane and is lifted by using the lifting system.

The fourth aspect of the invention provides a lifting method of a crane, which adopts the crane, and when the lifting operation is started, the second lifting mechanism drives the climbing frame to ascend; the first lifting mechanism and the second lifting mechanism are synchronously started; at the moment, a first execution unit for driving the active part to act rotates along a first direction;

when the descending operation is started, the first lifting mechanism and the second lifting mechanism are synchronously started; at this time, the first execution unit for driving the active part to act rotates in the direction opposite to the first direction.

According to the technical scheme, the device comprises the driven piece 111 fixed among different steps 61 and the main body part which can move along the length extension direction of the driven piece 111 and has mechanical transmission reverse transmission self-locking performance with the driven piece 111; wherein the main body portion includes a driving member 112 forming a kinematic pair with the driven member 111. Thus, the self-locking characteristic of the main body part and the driven part 111 is utilized to achieve the purposes of automatic protection and prevention of sudden drop of the load supported on the main body part when a fault occurs in the process of jacking operation or descending operation.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of the operation of a lifting mechanism and a hydraulic station of a first embodiment of the present application;

FIG. 2 is a schematic diagram of the operation of the lifting mechanism and hydraulic station of a second embodiment of the present application;

FIG. 3 is a schematic view of one embodiment of a tower crane having the lift mechanism of FIGS. 1 and 2 in a first operational state, when jacking is ready;

FIG. 4 is a side view of the first lift mechanism and the second lift mechanism of FIG. 3;

FIG. 5 is an enlarged view of the first lift mechanism of FIG. 3;

FIG. 6 is a schematic view of a second operating condition of the first and second lift mechanisms of FIG. 3, when jacking;

FIG. 7 is a schematic view of a third operating condition of the first and second lift mechanisms of FIG. 3, when a next lift cycle is entered;

FIG. 8 is a schematic diagram of the operation of the lifting mechanism and hydraulic station of the third embodiment of the present application employing a different lifting mechanism than that of FIG. 1;

FIG. 9 is a diagrammatic illustration of the operating principle of a lifting mechanism and hydraulic station of a fourth embodiment of the present application employing a different lifting mechanism than that of FIG. 2;

FIG. 10 is a schematic illustration of an operating condition of an embodiment of a tower crane having the hoist mechanism shown in FIGS. 8 and 9;

FIG. 11 is a schematic illustration of an operational state of another embodiment tower crane;

fig. 12 is an enlarged view of the first elevating mechanism in fig. 11.

Description of the reference numerals

1-a lifting mechanism; 11-a first lifting mechanism; 111-a follower; 112-an active part; 113-a reduction unit; 114-a first execution unit; 115-safety connections; 12-a second lifting mechanism; 121-a second execution unit; 2-a synchronization control unit; 21-a controller; 22-a detection unit; 3-a hydraulic station; 31-an oil pump; 32-a reversing valve; 343-a first throttle valve; 344-a second throttle valve; 33-a first oil passage; 34-a second oil path; 331-a balancing valve; 35-relief valves; 36-an oil filtration unit; 37-a fuel tank; 4-climbing frame; 5-a load section; 6-a fixed part; 61-stepping; 62-climbing attachment; 7-introduction system; 8-Standard knot to be introduced or withdrawn.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. In the present invention, it is to be understood that the terms "away", "toward", "upper", "lower", "front", "rear", "left", "right", and the like indicate an orientation or positional relationship corresponding to an orientation or positional relationship in actual use; "inner and outer" refer to the inner and outer relative to the profile of the components themselves; for convenience of description and simplicity of description only, and not to indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention, in which "self-climbing tower crane" refers to a tower crane capable of continuously increasing or decreasing the working height using its own equipped jacking system; the mechanical transmission reverse transmission self-locking property means that the mechanical rotation is transmitted irreversibly under a proper condition; namely: the mechanical rotation can only drive the driven part by the driving part, otherwise, the mechanical rotation is locked; the step refers to a fixed step welded on the crane and plays a supporting role in the lifting operation or the descending operation; the standard section is an important component of the tower crane and is divided into an integral standard section and a sheet standard section according to whether the standard section can be split or not, and the size of the standard section meets the requirements of related standard sizes.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

One aspect of the present invention provides a security module, as shown in fig. 1: the device comprises a driven part 111 fixed among different steps 61 and a main body part which moves along the length extension direction of the driven part 111 and has mechanical transmission and inverse transmission self-locking performance with the driven part 111; the main body portion includes a driving member 112 forming a kinematic pair with the driven member 111.

According to the technical scheme, the device comprises the driven piece 111 fixed among different steps 61 and the main body part which can move along the length extension direction of the driven piece 111 and has mechanical transmission reverse transmission self-locking performance with the driven piece 111; wherein the main body portion includes a driving member 112 forming a kinematic pair with the driven member 111. Thus, the self-locking characteristic of the main body part and the driven part 111 is utilized to achieve the purposes of automatic protection and prevention of sudden drop of the load supported on the main body part when a fault occurs in the process of jacking operation or descending operation.

Preferably, the driving member 112 rotationally advances along a length extending direction of the driven member 111; the main body part comprises a speed reducing device 113 which is arranged between the driving part 112 and a first execution unit 114 for driving the driving part 112 to act and can follow the driving part 112 to move along the length extending direction of the driven part 111. The reduction gear 113 can convert the high speed transmitted from the first execution unit 114 into the low speed required by the driving part 112, and the reduction gear 113 can be arranged to meet the requirements of various structural forms and the driven part 111 with mechanical transmission reverse transmission self-locking performance of the main body part.

The second aspect of the invention provides a lifting system, which comprises a lifting mechanism 1 and a hydraulic station 3 for driving the lifting mechanism 1 to act; the lifting mechanism 1 comprises a first lifting mechanism 11 and a second lifting mechanism 12 which run synchronously; wherein the first lifting mechanism 11 comprises the safety module described above.

Driving the lifting mechanism 1 by using the hydraulic station 3, and setting the lifting mechanism 1 to include a first lifting mechanism 11 and a second lifting mechanism 12 which operate synchronously; wherein, the first lifting mechanism 11 has mechanical transmission reverse transmission self-locking performance. Therefore, the purpose that the lifting mechanism 1 can automatically protect when a fault occurs in the lifting operation or the descending operation process is achieved by utilizing the self-locking characteristic of the first lifting mechanism 11.

Preferably, the lifting system comprises a first execution unit 114 for driving the active component 112 to act and a second execution unit 121 for driving the second lifting mechanism 12 to act.

In a jacking operation according to a specific embodiment, the second execution unit 121 is mainly used for supporting a load during a jacking operation or a lowering operation, and the first execution unit 114 is mainly used for preventing the load from instantly sliding down when a fault occurs during the jacking operation or the lowering operation, and preferably, the first execution unit 114 employs a motor or a motor to drive the driving member 112 to rotate and spirally advance along a length extending direction of the driven member 111.

When the first actuator 114 is driven by a motor. In this case, the hydraulic station 3 is a hydraulic station 3 as shown in fig. 2 or 9.

When the first actuator 114 is driven by a motor. In this case, the hydraulic station 3 is the hydraulic station 3 shown in fig. 1 or 8.

Preferably, the hydraulic station 3 comprises an oil pump 31 and a reversing valve 32 connected to an oil path between the oil pump 31 and the second actuator 121 for controlling the operating state of the second actuator 121; the second actuator 121 and a pipe connected between the second actuator 121 and the direction switching valve 32 form a first control oil path 33. The second actuator 121 can be supplied with pressure oil through the first control oil path 33, and the direction of the pressure oil supplied to the second actuator 121 is changed by the selector valve 32 to control the operating state of the second actuator 121.

Further preferably, the second executing unit 121 adopts a pressure cylinder with high working efficiency, stable and reliable performance, and convenient use and maintenance; the first control oil path 33 includes a balance valve 331 capable of controlling the pressure of both sides of the piston of the pressure cylinder, the balance valve 331 includes a balance valve body, and a balance valve first oil port, a balance valve second oil port and a balance valve control oil port formed on the balance valve body, the balance valve first oil port and the balance valve second oil port are respectively communicated with the oil pump 31 and the rodless cavity of the pressure cylinder, and the balance valve control oil port is communicated with the rod cavity of the pressure cylinder.

By arranging the balance valve 331, when a fault occurs in the middle of jacking, the jacked load can be ensured not to fall; the descending speed can be ensured to be stable when descending.

Preferably, the hydraulic station 3 comprises a second control oil circuit 34 connected in parallel with the first control oil circuit 33 downstream of the reversing valve 32 for controlling the action of the first execution unit 114; the first actuator 114 and a pipe connected between the first actuator 114 and the selector valve 32 form a second control oil passage 34. Thus, the first execution unit 114 and the second execution unit 121 can act simultaneously.

Further preferably, the first execution unit 114 adopts a motor including two working ports, and the second control oil path 34 further includes a first throttle valve 343 and a second throttle valve 344 respectively disposed on pipelines communicating the two working ports of the motor to improve the working stability of the motor.

The hydraulic station 3 further comprises an oil tank 37 and an overflow valve 35 connected between the oil pump 31 and the oil tank 37 and used for preventing the oil pump 31 from being overloaded, one end of the overflow valve 35 is communicated with the oil pump 31, and the other end of the overflow valve 35 is connected to the oil tank 37.

The hydraulic station 3 further comprises an oil filter unit 36 connected to the line between the oil tank 37 and the overflow valve 35, the oil filter unit 36 comprising an oil filter with a bypass valve for preventing contamination of the oil in the hydraulic station 3, by means of which oil filter on the one hand impurities in the oil tank 37 can be prevented from entering the line in the hydraulic station 3 and on the other hand a rapid return of pressure oil in the line to the oil tank 37 is facilitated.

In the lifting mechanism 1, the driven member 111 and the driving member 112 may be screw pairs, or may be rack and pinion pairs.

Preferably, the driven member 111 includes a first screw structure, and the driving member 112 includes a second screw structure screw-mounted on the first screw structure. By means of the characteristics of the threads, the driven piece 111 and the driving piece 112 can only advance spirally along the axial direction of the first thread structure and the axial direction of the second thread structure and cannot advance linearly directly, so that when an unexpected situation occurs, the driving piece 112 can be prevented from moving linearly along the axial direction of the driven piece 111, and the effect of safety protection is achieved. The structure is simple and the cost is low.

Further preferably, the first thread structure comprises a climbing screw, and the second thread structure comprises a climbing nut spirally mounted on the climbing screw; the speed reduction device 113 adopts a gear reducer, and an output shaft of the gear reducer adopts a hollow shaft; the climbing screw is rotatably inserted into the hollow shaft, as shown in fig. 5, in a specific embodiment, the climbing nut is fixed on a bearing supporting the hollow shaft, so that the purpose of driving the climbing nut to advance spirally along the climbing screw by using a gear reducer is achieved, and meanwhile, the gear reducer is driven by the climbing nut to move along the axis of the climbing screw.

In order to reduce the maintenance period, the driven member 111 and the driving member 112 have longer service life, and the rack-and-pinion pair preferably has the driven member 111 comprising a rack and the driving member 112 comprising a pinion engaged with the rack; the lifting system further comprises a worm gear reducer connected between the gear and the first execution unit 114 for driving the gear to act. As shown in fig. 8 to 10, the worm of the worm gear reducer is connected to the first actuator 114, and the gear engaged with the rack is rigidly connected to the worm gear reducer, and is driven by the first actuator 114 to run along the rack, and at the same time, the worm gear reducer is driven to advance along the length extension direction of the rack.

It is further preferable that the first lifting mechanism 11 includes a safety link 115 for fixing the follower 111, one end of the safety link 115 is fixed to one end of the first lifting mechanism 11, for example, in a tower crane, the safety link 115 is fixed to an upper end of the follower 111, and the other end of the safety link 115 is detachably connected to a standard knot of the tower crane, so that the first lifting mechanism 11 is fixed and installed in a lifting operation or a lowering operation.

Preferably, a synchronous control unit 2 is included for calculating and sending instructions according to the working state of the second lifting mechanism 12 to control the movement of the first lifting mechanism 11 so as to enable the second lifting mechanism 12 and the first lifting mechanism 11 to synchronously operate. In this way, the synchronous operation of the first lifting mechanism 11 and the second lifting mechanism 12 can be automatically maintained.

Preferably, the synchronous control unit 2 includes a controller 21 and a detection unit 22, and the controller 21 can receive a detection signal from the detection unit 22 to process and coordinate the synchronous movement of the first lifting mechanism 11 and the second lifting mechanism 12.

In one embodiment, as shown in fig. 1, 2, 8, and 9, the detection unit 22 employs a speed sensor; the speed sensors measure the speeds of the second execution unit 121 and the active part 112, and send the speed signals to the controller 21, and the controller 21 coordinates the speed of the first execution unit 114 by calculating and comparing the difference between the two speeds, so that the speed difference between the active part 112 and the second execution unit 121 is kept within a set range value.

Furthermore, a dragging unit is arranged between the first lifting mechanism 11 and the second lifting mechanism 12, and generally, a complete lifting operation or a complete lowering operation can be completed only by lifting for many times or lowering for many times; fig. 3, 6 and 7 are schematic diagrams of three different working states. The connection mode between the dragging unit and the first lifting mechanism 11 and the second lifting mechanism 12 is shown in fig. 4.

In this way, the dragging unit can finish one jacking or descending step, and when the next jacking or descending step is started, the first lifting mechanism 11 and the second lifting mechanism 12 are in place again, so that necessary working conditions are provided for the next jacking or descending step. As shown in fig. 3, at the time of starting jacking, the piston rod of the pressure cylinder is in a state of being retracted in the pressure cylinder, and the driving member 112 is located at the lower end of the driven member 111; as shown in fig. 6, during the jacking process, the piston rod of the pressure cylinder extends out of the pressure cylinder, the driving member 112 moves up along the driven member 111 along with the extension of the piston rod, when the jacking is in place, the piston rod of the pressure cylinder extends out of the pressure cylinder to the maximum extent, and the driving member 112 moves to the upper end of the driven member 111; if the next jacking operation is performed, the load and the pressure cylinder need to be fixed to the next working position, and the piston rod of the pressure cylinder needs to be retracted into the pressure cylinder to prepare for the next jacking operation, as shown in fig. 7, at this time, the first lifting mechanism 11 also needs to be moved to the next working position, and at this time, the first lifting mechanism 11 needs to be dragged to the next working position by the dragging unit while the piston rod is retracted, and the first lifting mechanism 11 and the second lifting mechanism 12 are in place to prepare for the next jacking operation.

A third aspect of the present invention provides a crane comprising the above-described lifting system and a climbing frame 4 located above the crane and being lifted by the lifting system.

In a specific embodiment, as shown in fig. 3, the crane is a self-climbing tower crane, and when the working height of the self-climbing tower crane is raised or lowered, the self-climbing tower crane comprises a movable moving part and a non-movable fixed part 6, the movable part comprises a load 5, a climbing frame 4 detachably connected with the load 5, and a climbing connecting part 62 for fixing the climbing frame 4, and the fixed part 6 comprises a fixed standard knot fixed on a foundation and steps 61 arranged on the fixed standard knot at regular intervals along the height direction of the self-climbing tower crane; during the lifting operation or the descending operation, the climbing frame 4 is fixed by the climbing connecting piece 62 when being lifted or descended to the distance between two adjacent steps 61, and the climbing connecting piece 62 is hung into the next step 61 and is mechanically positioned, so that the lifting operation of one step is completed. The load lifted at the upper part and the climbing frame 4 are reliably connected and positioned with the steps 61 on the standard knot at the lower part through the climbing connecting piece 62, and the distance between two steps 61 is left between the next standard knot.

One end of the second lifting mechanism 12 is fixedly connected with the climbing frame 4, and the other end of the second lifting mechanism 12 is supported on the step 61; two ends of the first lifting mechanism 11 are respectively fixed on two adjacent steps 61 on the fixing part 6, so that the load 5 and the climbing frame 4 move simultaneously under the action of the lifting system during the lifting operation or the descending operation; the second lifting mechanism 12 is an active lifting component, the first lifting mechanism 11 and the second lifting mechanism 12 lift synchronously with the lifting maintenance of the second lifting mechanism 12, and when the second lifting mechanism 12 cannot work normally, such as a rubber pipe bursts, a sudden power failure, a pressure cylinder damage, etc.; the first lifting mechanism 11 has mechanical transmission reverse transmission self-locking property, at this time, the gravity of the load with the upper part being lifted is transmitted to the speed reducing device 113 through the climbing frame 4, then transmitted to the driving part 112, and further transmitted to the fixed standard knot, so that the dangerous condition that the load slides down is prevented.

The second lifting mechanism 12 or other components in the hydraulic station 3 are prevented from being broken down, so that the load 5 suddenly slides down to cause an accident.

The self-climbing crane further comprises an introduction system 7; the lead-in system 7 can lead in or lead out the standard knot 8 to be led in or led out from between the load 5 and the fixing part 6 during jacking operation, so that the aim of raising or lowering the operation height of the crane is fulfilled.

The fourth aspect of the invention provides a lifting method of a crane, which adopts the crane, when the lifting operation is started, the second lifting mechanism 12 drives the climbing frame 4 to ascend; the first lifting mechanism 11 and the second lifting mechanism 12 are started synchronously; at this time, the first execution unit 114 for driving the active component 112 to act rotates along a first direction;

when the descending operation is started, the first lifting mechanism 11 and the second lifting mechanism 12 are synchronously started; at this time, the first execution unit 114 for driving the active component 112 to act rotates in a direction opposite to the first direction.

The lifting method of the crane utilizes the second lifting mechanism 12 to provide power when starting lifting operation or descending operation, adopts the first lifting mechanism 11 comprising a safety module to carry out safety protection, and utilizes the self-locking characteristic of the main body part of the safety module and the driven part 111 to achieve the purposes of automatic protection and preventing the load 5 from suddenly descending when a fault occurs in the lifting operation or the descending operation process so as to cause safety accidents.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention. For example, hydraulic drive may be changed to pneumatic drive; the drive of the climbing nut may be changed to a manual drive as shown in fig. 11, 12.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, for example, the dragging unit can be a chain. The invention is not described in detail in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.