阅读说明：本技术 一种低成本塔机用回转控制系统及控制方法 (Low-cost rotation control system and control method for tower crane ) 是由 程江龙 范俊红 方建飞 陈江南 叶志云 应旦昊 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种低成本塔机用回转控制系统,它包括控制中心,控制中心上电性连接有变频器、失电检测模块和联动台；联动台与控制中心之间连接有第一信号线、第二信号线和互锁装置；变频器上电性连接有回转机构；回转机构上电性连接有电机转速传感器。依据上述控制系统所构建的控制方法,由第一信号线或第二信号线分别将联动台上的发出的电位信号或者档位信号发送给控制中心,控制中心根据接收到的电位信号或者档位信号控制变频器启动,通过变频器以改变回转机构输出的频率、电压和速率。本发明不仅能够降低生产成本,还具有使用稳定性高、使用安全性高、使用寿命长、适用范围广、结构简单和可靠性高的优点。(The invention discloses a low-cost rotation control system for a tower crane, which comprises a control center, wherein a frequency converter, a power loss detection module and a linkage table are electrically connected to the control center; a first signal wire, a second signal wire and an interlocking device are connected between the linkage table and the control center; the frequency converter is electrically connected with a swing mechanism; the swing mechanism is electrically connected with a motor rotating speed sensor. According to the control method constructed by the control system, the first signal wire or the second signal wire respectively sends the potential signal or the gear signal sent by the linkage table to the control center, the control center controls the frequency converter to start according to the received potential signal or the gear signal, and the frequency, the voltage and the speed output by the swing mechanism are changed through the frequency converter. The invention can reduce the production cost, and has the advantages of high use stability, high use safety, long service life, wide application range, simple structure and high reliability.)

1. The utility model provides a low-cost gyration control system for tower machine which characterized in that: the system comprises a control center (1), wherein a frequency converter (2), a power-off detection module and a linkage table (3) are electrically connected to the control center (1); a first signal line (4) and a second signal line (5) which are arranged in parallel are connected between the linkage table (3) and the control center (1), and an interlocking device is arranged between the first signal line (4) and the second signal line (5); the frequency converter (2) is electrically connected with a swing mechanism (6); the slewing mechanism (6) is electrically connected with a motor rotating speed sensor (8), and the output end of the motor rotating speed sensor (8) is electrically connected with the control center (1); the power loss detection module is electrically connected with the rotary motor (7).

2. The rotation control system for the low-cost tower crane according to claim 1, characterized in that: the power loss detection module comprises a first comparator (9), a second comparator (10) and a third comparator (11) which are mutually connected in series, and the input end of the third comparator (11) is connected with a mutual inductor; a plurality of resistors and diodes are arranged between the input end of the first comparator (9) and the output end of the second comparator (10).

3. The rotation control system for the low-cost tower crane according to claim 1, characterized in that: the interlocking device comprises a first relay (12), a second relay (13), a third relay (14) and a fourth relay (15), the first relay (12) and the second relay (13) are electrically connected with the first signal line (4) in a mutual parallel mode, and a normally closed switch Q1 of the first relay (12) and a normally closed switch Q2 of the second relay (13) are both mutually connected in series with the third relay (14); the third relay (14) and the fourth relay (15) are electrically connected with the second signal wire (5) in a mutual parallel mode, and the normally closed switch Q3 of the third relay (14) and the normally closed switch Q4 of the fourth relay (15) are mutually connected in series with the first relay (12).

4. The rotation control system for the low-cost tower crane according to claim 1, characterized in that: the slewing mechanism of the tower crane comprises three speed reducing motors (16) which are distributed in a triangular shape, and a driving gear (17) is arranged on each speed reducing motor (16); and a tower crane large arm driving gear (18) is meshed and connected among all the driving gears (17), and the tower crane large arm driving gear (18) is used for driving the tower crane large arm to rotate.

5. The rotation control system for the low-cost tower crane according to claim 1, characterized in that: the linkage table (3) is provided with a handle linkage potentiometer and a handle position master switch, and the first signal wire (4) is electrically connected with the handle linkage potentiometer; the second signal wire (5) is electrically connected with the handle position master switch.

6. The control method constructed by the rotation control system for the low-cost tower crane according to any one of claims 1 to 5, is characterized in that: the control center controls the frequency converter to start according to the received potential signal or gear signal, and the frequency, voltage and speed output by the slewing mechanism are changed through the frequency converter, so that the slewing work of the tower crane is controlled; meanwhile, the working state of the slewing mechanism can be synchronously detected and synchronously sent to a control center through the motor speed sensor and the power loss detection module, and the state monitoring of the slewing mechanism is completed.

Technical Field

The invention relates to a control system and a control method for a tower crane, in particular to a low-cost rotation control system and a control method for the tower crane.

Background

The slewing mechanism of the tower crane is suitable for driving a heavy object to rotate, and if the slewing mechanism is not accurately controlled, the phenomenon of shaking is easy to occur, so that safety accidents are easy to occur; at present, a rotation control system commonly used for a tower crane mostly adopts an eddy current controller to carry out auxiliary speed regulation, but a motor needing to be equipped by utilizing the eddy current controller needs to be a torque motor, and an independent heat dissipation device needs to be equipped for the torque motor, so that the production cost of the whole control system is increased. Therefore, the existing tower crane rotation control system has the problem of high production cost.

Disclosure of Invention

The invention aims to provide a low-cost rotation control system and a low-cost rotation control method for a tower crane. The invention has the advantage of low production cost.

The technical scheme of the invention is as follows: a low-cost rotary control system for a tower crane comprises a control center, wherein a frequency converter, a power loss detection module and a linkage table are electrically connected to the control center; a first signal wire and a second signal wire which are arranged in parallel are connected between the linkage table and the control center, and an interlocking device is arranged between the first signal wire and the second signal wire; the frequency converter is electrically connected with a swing mechanism; the swing mechanism is electrically connected with a motor rotating speed sensor, and the output end of the motor rotating speed sensor is electrically connected with the control center; the power loss detection module is electrically connected with the rotary motor.

In the low-cost rotation control system for the tower crane, the power loss detection module comprises a first comparator, a second comparator and a third comparator which are connected in series, and an input end of the third comparator is connected with a mutual inductor; a plurality of resistors and diodes are arranged between the input end of the first comparator and the output end of the second comparator.

In the low-cost rotation control system for the tower crane, the interlocking device comprises a first relay, a second relay, a third relay and a fourth relay, the first relay and the second relay are electrically connected with a first signal line in a mutual parallel mode, and a normally closed switch Q1 of the first relay and a normally closed switch Q2 of the second relay are both mutually connected in series with the third relay; the third relay and the fourth relay are electrically connected with the second signal line in a parallel mode, and the normally closed switch Q3 of the third relay and the normally closed switch Q4 of the fourth relay are connected with the first relay in series.

In the rotation control system for the low-cost tower crane, the tower crane rotation mechanism comprises three speed reducing motors which are distributed in a triangular manner, and each speed reducing motor is provided with a driving gear; and a tower crane large arm driving gear is meshed and connected among all the driving gears and is used for driving the tower crane large arm to rotate.

In the low-cost rotation control system for the tower crane, the linkage table is provided with a handle linkage potentiometer and a handle position master switch, and the first signal line is electrically connected with the handle linkage potentiometer; the second signal line is electrically connected with the handle position master switch.

The control method constructed according to the rotation control system for the low-cost tower crane comprises the steps that a first signal line or a second signal line respectively sends a potential signal or a gear signal sent by a linkage table to a control center, the control center controls a frequency converter to start according to the received potential signal or the gear signal, and the frequency, the voltage and the speed output by a rotation mechanism are changed through the frequency converter, so that the rotation work of the tower crane is controlled; meanwhile, the working state of the slewing mechanism can be synchronously detected and synchronously sent to a control center through the motor speed sensor and the power loss detection module, and the state monitoring of the slewing mechanism is completed.

Compared with the prior art, the invention improves the existing rotation control system for the tower crane, and the frequency converter, the rotation motor and the rotation mechanism are electrically connected on the control center, and an eddy current brake is not needed for auxiliary speed regulation by utilizing the way that the frequency converter and the rotation motor are mutually matched, thereby reducing the overall cost of the rotation control system; the motor rotating speed sensor is arranged among the frequency converter, the rotary motor and the control center, and can be used for detecting the rotating speed of the rotary motor in real time, so that the rotating working state of the tower crane is monitored according to the rotating speed of the rotary motor, and the working state of the tower crane can be timely processed when emergency or abnormal reaction occurs, the abrasion of the tower crane is reduced, and the service life is prolonged; the first signal line and the second signal line are connected between the linkage table and the control center, and different control signal acquisition is carried out by utilizing the first signal line and the second signal line to provide starting signals for the swing claw energy control system of the tower crane, so that the whole swing control system of the tower crane is in a dual control mode, and further can adapt to different demand scenes, and the application range is expanded; by arranging the interlocking device between the first signal wire and the second signal wire, the mutual influence of the double first signal wires and the second signal wire can be avoided by utilizing the interlocking device, and when one of the first signal wires and the second signal wire fails, the other signal wire and the second signal wire can be operated in time, so that the use stability is improved; meanwhile, the power-off detection module is arranged, the power-on condition of the tower crane can be detected by the power-off detection module, and when the tower crane has sudden power failure, the power-off condition can be timely fed back to the control center for processing, so that the use safety is improved. In addition, the first comparator, the second comparator and the third comparator are arranged, and the attenuation degree of the current is judged by utilizing three-layer comparison, so that the reliability of detection is improved; by arranging the first relay, the second relay, the third relay and the fourth relay, the interlocking function of the first signal line and the second signal line is completed by utilizing the characteristics that the normally closed switch of the relay is closed under the condition of power-on and is disconnected under the condition of power-off, and the integrated structure is simple and convenient to connect; through setting up three gear motor, all be connected with drive gear on every gear motor, all drive gear all are connected with the meshing of the big arm drive gear of tower machine, utilize three and drive gear to drive the big arm drive gear of tower machine rotatory, fine regulation the big arm drive gear pivoted intensity of tower machine, the atress is more even to improved the stability of tower machine gyration work and gone on. Therefore, the invention not only can reduce the production cost, but also has the advantages of high use stability, high use safety, long service life, wide application range, simple structure and high reliability.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a circuit diagram of a power loss detection module;

fig. 3 is a schematic structural diagram of the swing mechanism.

The labels in the figures are: 1-a control center, 2-a frequency converter, 3-a linkage table, 4-a first signal line, 5-a second signal line, 6-a swing mechanism, 8-a motor speed sensor, 9-a first comparator, 10-a second comparator, 11-a third comparator, 12-a first relay, 13-a second relay, 14-a third relay, 15-a fourth relay, 16-a speed reducing motor, 17-a driving gear and 18-a tower crane large arm driving gear.

Detailed Description

The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.

Examples are given. A low-cost rotary control system for a tower crane is formed as shown in figures 1 to 3 and comprises a control center (1), wherein a frequency converter (2), a power loss detection module and a linkage table (3) are electrically connected to the control center (1); a first signal line (4) and a second signal line (5) which are arranged in parallel are connected between the linkage table (3) and the control center (1), and an interlocking device is arranged between the first signal line (4) and the second signal line (5); the frequency converter (2) is electrically connected with a swing mechanism (6); the slewing mechanism (6) is electrically connected with a motor rotating speed sensor (8), and the output end of the motor rotating speed sensor (8) is electrically connected with the control center (1); the power loss detection module is electrically connected with the rotary motor (7).

The power loss detection module comprises a first comparator (9), a second comparator (10) and a third comparator (11) which are mutually connected in series, and the input end of the third comparator (11) is connected with a mutual inductor; a plurality of resistors and diodes are arranged between the input end of the first comparator (9) and the output end of the second comparator (10); the interlocking device comprises a first relay (12), a second relay (13), a third relay (14) and a fourth relay (15), the first relay (12) and the second relay (13) are electrically connected with the first signal line (4) in a mutual parallel mode, and a normally closed switch Q1 of the first relay (12) and a normally closed switch Q2 of the second relay (13) are both mutually connected in series with the third relay (14); the third relay (14) and the fourth relay (15) are electrically connected with the second signal wire (5) in a mutual parallel mode, and a normally closed switch Q3 of the third relay (14) and a normally closed switch Q4 of the fourth relay (15) are mutually connected in series with the first relay (12); the slewing mechanism of the tower crane comprises three speed reducing motors (16) which are distributed in a triangular shape, and a driving gear (17) is arranged on each speed reducing motor (16); a tower crane large arm driving gear (18) is meshed and connected among all the driving gears (17), and the tower crane large arm driving gear (18) is used for driving a tower crane large arm to rotate; the linkage table (3) is provided with a handle linkage potentiometer and a handle position master switch, and the first signal wire (4) is electrically connected with the handle linkage potentiometer; the second signal wire (5) is electrically connected with the handle position master switch.

According to the control method constructed by the rotation control system for the low-cost tower crane, as shown in fig. 1, a first signal line or a second signal line respectively sends a potential signal or a gear signal sent by a linkage table to a control center, the control center controls a frequency converter to start according to the received potential signal or gear signal, and the frequency, voltage and speed output by a rotation mechanism are changed through the frequency converter, so that the rotation work of the tower crane is controlled; meanwhile, the working state of the slewing mechanism can be synchronously detected and synchronously sent to a control center through the motor speed sensor and the power loss detection module, and the state monitoring of the slewing mechanism is completed.

The working principle is as follows: in the specific use process, when the tower crane needs to be controlled to perform the rotation action, firstly, a rotation signal is sent to the control center 1 through the linkage table 3, wherein the rotation signal can be sent from a handle linkage potentiometer of the linkage table 3 or a handle position master switch, the handle linkage potentiometer is electrically connected with the first signal line 4, the handle position master switch is electrically connected with the second signal line 5, when the handle linkage potentiometer sends out a potential signal, current passes through the first signal line 4, so that the second relay 13 is electrified to work, when the second relay 13 is electrified to work, the normally closed switch Q2 of the third relay is disconnected, so that the third relay 14 and the fourth relay 15 cannot be connected to work, and when the third relay 14 and the fourth relay 15 do not work, the normally closed switch Q3 of the third relay 14 and the normally closed switch Q4 of the fourth relay 15 are in a closed state, thereby, the first relay 12 is also in an operating state, so that the second signal line 5 does not flow through the signal; similarly, when the handle position master switch sends a gear signal, namely the second signal line 5 is electrified, the third relay 14 and the fourth relay 15 are electrified and started, and the first relay 12 and the second relay 13 are powered off and do not work, so that the first signal line 4 and the second signal line 5 are interlocked, and the phenomenon that the two send signals simultaneously can not occur; when the first signal wire 4 sends a potential signal to the control center 1 or the second signal wire 5 sends a gear signal to the control center 1, the control center 1 sends a frequency conversion signal to the frequency converter 2 after receiving the potential signal or the gear signal, and the frequency converter 2 works after receiving the frequency conversion signal sent by the control center 1; when the frequency converter 2 works, the voltage passing through the reducing motor 16 is adjusted, so that the frequency, the voltage and the speed output by the reducing motor 16 are controlled, the reducing motor 16 can drive the driving gear 17 to rotate after rotating, the driving gear 17 is meshed and connected with the tower crane large-arm driving gear 18, and the driving gear 17 can drive the tower crane large-arm driving gear 18 to rotate together when rotating, so that the change of the rotation state of the tower crane is completed; meanwhile, as the plurality of driving gears 17 are arranged, the rotating strength of the driving gear of the large arm of the tower crane can be well adjusted by utilizing the plurality of driving gears 17, and the stress is more uniform, so that the stability of the rotary work of the tower crane is improved; meanwhile, the motor speed sensor 8 and the power loss detection module can synchronously detect the working state of the speed reducing motor 16; the motor rotating speed sensor 8 can detect the rotating speed of the running of the speed reducing motor 16 in real time and send the detected speed value to the control center 1, and a comparator arranged in the control center 1 is compared with a set speed value to ensure the stable operation of the rotary operation; when the power loss detection module works, the detected current enters the third comparator 11 through the mutual inductor, the third comparator 11 is compared with the reference voltage set inside for the first time, after the first comparison is completed, the current sequentially passes through the second comparator 10 and the first comparator 9 through the resistor and the diode, the third comparison and the second comparison are respectively performed in the first comparator 9 and the second comparator 10, and whether the attenuation of the detected signal current is zero or not is judged by utilizing multiple comparisons, so that whether the power loss occurs or not is judged; when the power loss detection module judges that power is lost, the control center 1 sends an alarm signal, and manually adjusts the gear to a braking gear or directly controls the speed reduction motor 16 to stop so as to brake the whole rotating system of the tower crane in time, avoid safety accidents caused by inertial running of the tower crane and improve the use safety.