CN213387498U - Double-brake lifting speed regulation control system of tower crane - Google Patents
Double-brake lifting speed regulation control system of tower crane Download PDFInfo
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- CN213387498U CN213387498U CN202021719986.5U CN202021719986U CN213387498U CN 213387498 U CN213387498 U CN 213387498U CN 202021719986 U CN202021719986 U CN 202021719986U CN 213387498 U CN213387498 U CN 213387498U
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Abstract
The utility model relates to the technical field of tower cranes, in particular to a double-brake lifting speed regulation control system of a tower crane, which comprises a PLC and a frequency converter, wherein the PLC controls a lifting mechanism of the tower crane through the frequency converter, the output end of the PLC is connected with the frequency converter, and the output end of the frequency converter is connected with a lifting motor; the automatic control device is characterized by further comprising an operation table, wherein a microswitch and a limit switch of the operation table are connected with the input end of the PLC, and a control signal and a reset button switch of the frequency converter are connected with the input end of the PLC. After the structure is adopted, the utility model eliminates the braking impact, reduces the electrical maintenance, reduces the electric energy consumption, improves the power factor and the like, and can obtain good actual effect; meanwhile, the system also has overcurrent, overvoltage, undervoltage and input open-phase protection, and frequency converter overtemperature, overload, overspeed, brake unit overheating, I/0 fault protection, motor fault protection and the like.
Description
Technical Field
The utility model relates to a tower crane technical field, especially a tower crane dual-brake plays to rise speed governing control system.
Background
The hoisting mechanism is the most important transmission mechanism of the tower crane, and the quality of the speed regulation mode directly influences the performance of the whole crane. At present, the traditional speed regulation mode can not realize heavy load low speed, light load high speed and has small speed regulation range. The speed regulation mode selection principle of the hoisting mechanism is three: firstly, the stability and the small impact are required; secondly, the method is economical and reliable and accords with the national conditions; and thirdly, the maintenance is convenient. The commonly used traditional speed regulation methods of the tower crane include the following methods: firstly, regulating the speed of a wound asynchronous motor rotor by series resistance, regulating the speed of a thyristor stator by voltage and regulating the speed of a cascade; secondly, a reducer for shifting gears of the electromagnetic clutch is added with a single-speed wound rotor motor with eddy current brake; thirdly, a multi-speed wound rotor motor with eddy current brake is added to the common speed reducer; fourthly, adding double motors to the differential planetary reducer; fifthly, regulating the speed of the motor in a series manner; sixthly, the electric control is complex, the maintenance is difficult, and the material consumption is frequent. They have the common characteristics of poor transmission performance, poor reliability, increased energy consumption and increased maintenance cost, and all adopt a single braking mode. The single brake has the advantages of simple structure and convenient installation, debugging and maintenance; the defect is also the most important fatal point, namely when the brake fails, the motor shaft or the speed reducer shaft is damaged, the brake friction plate is worn and the like, no other protective measures are taken to brake the lifting device, and accidents caused by the reasons are rare.
Chinese utility model patent CN 201347335Y discloses a speed regulation control system for a tower crane hoisting mechanism, which controls the hoisting mechanism of the tower crane through a frequency converter by a PLC, inputs each shift of switching value of hoisting and descending of the tower crane into the PLC, the output of the PLC is connected with the frequency converter, and the output of the frequency converter is connected with a hoisting motor; PLC program design is carried out to complete logic operation of a given signal and a peripheral signal of the lifting frequency converter, control of a brake and logic judgment and alarm of various fault signals.
Disclosure of Invention
The utility model discloses the technical problem that needs to solve provides a tower crane dual-brake plays to rise speed governing control system that can be nimble and reliable and stable speed governing to tower crane hoisting mechanism.
In order to solve the technical problem, the double-brake lifting speed regulation control system of the tower crane comprises a PLC and a frequency converter, wherein the PLC controls a lifting mechanism of the tower crane through the frequency converter, the output end of the PLC is connected with the frequency converter, and the output end of the frequency converter is connected with a lifting motor; the automatic control device is characterized by further comprising an operation table, wherein a microswitch and a limit switch of the operation table are connected with the input end of the PLC, and a control signal and a reset button switch of the frequency converter are connected with the input end of the PLC.
Preferably, the hoisting mechanism is a double-brake mechanism, the hoisting mechanism comprises a winding drum and a speed reduction motor, the winding drum is connected with the speed reduction motor, and a shaft head of the winding drum is provided with a limiter.
Preferably, the brake is electrically connected with the PLC, and the output end of the PLC is connected to the coil of the relay of the brake.
Preferably, the system further comprises a lifting fan, and the lifting fan is connected with the PLC.
Preferably, the power input end of the frequency converter is connected with a power supply through a reactor and a main contactor, and the power supply is respectively connected with a lifting fan and a lifting motor.
After the structure of the oil adding device is adopted, the utility model discloses an advanced PLC variable frequency speed control technique carries out technical transformation to tower crane electric drive system, makes hoist hoisting mechanism realize steady operation, improves the operating efficiency, improves the overload operation, eliminates and plays the braking impact, reduces electrical maintenance, reduces power consumption, improves power factor etc. and all can gain good actual effect. Meanwhile, the system also has overcurrent, overvoltage, undervoltage and input open-phase protection, and frequency converter overtemperature, overload, overspeed, brake unit overheating, I/0 fault protection, motor fault protection and the like.
1) The speed regulation range is wide, and the operation with the requirement of accurate control and positioning can be realized;
2) the soft start and stop functions reduce mechanical transmission impact, can obviously improve the bearing performance of a steel structure, and prolong the service life of the crane;
3) the high-integration component and the high-reliability low-voltage electrical appliance effectively solve the problem of complex wiring of an original electrical system, reduce the fault probability of the system and are easy to maintain;
4) when the motor is at zero speed, the full torque can be output, and even if the brake is loosened or fails, the heavy object cannot slide down, so that the safety and reliability of the system are ensured;
5) the system has quick dynamic response, does not slide the hook and really realizes the zero-speed crossing function;
6) the special load weight measuring and controlling instrument is matched with corresponding software, the lifting speed can be automatically switched along with the change of the load weight, and the operation requirements of 'light load is fast, heavy load is slow';
7) the frequency converter used by the system has an automatic energy-saving operation mode, can improve the power factor of the system and the working efficiency of the whole machine, has obvious energy-saving effect, and has the average power-saving rate of more than 20 percent.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a circuit schematic diagram of a double-brake lifting speed regulation control system of a tower crane.
FIG. 2 is a PLC control diagram of the double-brake lifting speed-regulating control system of the tower crane.
Fig. 3 is a control diagram of a lifting frequency converter of a double-brake lifting speed-regulating control system of the tower crane.
Detailed Description
As shown in fig. 1 and 2, the dual-brake lifting speed-regulating control system of the tower crane of the present invention comprises a PLC and a frequency converter, wherein the PLC controls a lifting mechanism of the tower crane through the frequency converter, an output end of the PLC is connected with the frequency converter, and an output end of the frequency converter is connected with a lifting motor; the automatic control device is characterized by further comprising an operation table, wherein a microswitch and a limit switch of the operation table are connected with the input end of the PLC, and a control signal and a reset button switch of the frequency converter are connected with the input end of the PLC. The lifting mechanism is a double-brake mechanism and comprises a connected winding drum and a speed reduction motor with a brake, and a limiter is installed on a shaft head of the winding drum. The brake is electrically connected with the PLC, and the output end of the PLC is connected to a coil of a relay of the brake. In addition, this tower crane dual-brake plays to rise speed governing control system still includes and plays to rise the fan, it is connected with PLC to play to rise the fan. The power input end of the frequency converter is connected with a power supply through a reactor and a main contactor, and the power supply is respectively connected with a lifting fan and a lifting motor.
In the embodiment, as shown in fig. 1-3, the switch of the console is connected to the input terminals I0.0 to I0.5 of the PLC, the limit switch is connected to the input terminals I0.6 to I1.4 of the PLC, the control signal of the frequency converter is connected to the input terminals 2L, Q0.4.4 to 1.0 of the PLC, the reset button switch is connected to the input terminal I2.1 of the PLC, the signal of the frequency converter is prepared, the switch is opened and connected to the terminals I1.6 to 1.7 of the PLC, and the brake control PLC power supply Q1L is connected to the relay coil Q0.0, 0.1, 0.2 and 0.3.
The output end of the PLC is connected to input terminals Q2L and Q0.4-1.0 of the frequency converter, and the output end of the PLC is connected to coils A1 of a confirmation relay of the brake, XLFa and XLFa 2. Therefore, the brake control circuit is composed of transformers 160V, 80V and 0V, wherein 160V and 0V are connected to main contacts L4 and L2 of LFa2, main contacts L1 and L3 of contactors LFa and LFa2 are connected to one end of a rectifier diode to form half-wave rectification output, the half-wave rectification output is connected to main contacts L2 and L4 of LFa, L1 and L3 are combined and connected to No. 11 of a RedFa1 connection terminal on a switch, 80V of the transformer is directly connected to No. 12 of an L terminal, motor brake coils are connected to No. 11 and No. 12 terminals, and the voltage of the brake coils is about 90V of direct current.
The power supply is connected to a power input end R \ S \ T of the frequency converter through a main contactor KM and a reactor React l, the power supply is connected to the fan LVeM, an output terminal U \ V \ W motor LM of the frequency converter is connected, and a direct current output terminal of the frequency converter is connected to the brake resistor RL through the brake units PB and PB.
After the power is switched on, limit switches such as I0.6-I1.6 are firstly closed. The PLC firstly sends out operation control signals (Xl forward rotation and X2 reverse rotation) to the frequency converter, the frequency converter starts to start preparation I1.6 after receiving the operation signals, and when three quantities of the output current, the output torque and the output frequency of the frequency converter reach set values, the frequency converter is closed by an opening signal Y8 (I1.7). And (4) switching on the brake control circuit, opening the motor brake, and starting the motor to run.
And determining a signal output point of the PLC, wherein Q and I terminals of the lifting PLC comprise signal output points of forward rotation, reverse rotation, fault reset, a first multi-speed section, a second multi-speed section, a third multi-speed section, external faults and the like. The corresponding signals are transmitted to the frequency converter, and the frequency converter changes the frequency according to the signals to realize the speed change process in the ascending or descending process.
According to production requirements, the ascending or descending operation speed is changed by changing the frequency set values of speed change signal output points X3, X4 and X5 of the PLC and frequency converters I0.0-0.5 at each section, so that the operation period of the crane is changed to adapt to the production process requirements of various buildings.
In order to ensure the safety in the production process and debugging and overhauling, a fault display alarm signal is arranged on the frequency converter and the PLC. The system can be started and normally operated only when no fault exists. Otherwise, the system can send out a fault alarm signal to remind maintenance personnel to remove the fault.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many changes and modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.
Claims (5)
1. The utility model provides a double-brake plays to rise speed governing control system of tower crane, includes PLC and converter, its characterized in that: the PLC controls a hoisting mechanism of the tower crane through a frequency converter, the output end of the PLC is connected with the frequency converter, and the output end of the frequency converter is connected with a hoisting motor; the automatic control device is characterized by further comprising an operation table, wherein a microswitch and a limit switch of the operation table are connected with the input end of the PLC, and a control signal and a reset button switch of the frequency converter are connected with the input end of the PLC.
2. The double-brake lifting speed regulation control system of the tower crane according to claim 1, characterized in that: the lifting mechanism is a double-brake mechanism and comprises a connected winding drum and a speed reduction motor with a brake, and a limiter is installed on a shaft head of the winding drum.
3. The double-brake lifting speed regulation control system of the tower crane according to claim 2, characterized in that: the brake is electrically connected with the PLC, and the output end of the PLC is connected to a coil of a relay of the brake.
4. The double-brake lifting speed regulation control system of the tower crane according to claim 2, characterized in that: the device further comprises a lifting fan, and the lifting fan is connected with the PLC.
5. The double-brake lifting speed regulation control system of the tower crane according to claim 1, characterized in that: the power input end of the frequency converter is connected with a power supply through a reactor and a main contactor, and the power supply is respectively connected with a lifting fan and a lifting motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021719986.5U CN213387498U (en) | 2020-08-18 | 2020-08-18 | Double-brake lifting speed regulation control system of tower crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021719986.5U CN213387498U (en) | 2020-08-18 | 2020-08-18 | Double-brake lifting speed regulation control system of tower crane |
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| Publication Number | Publication Date |
|---|---|
| CN213387498U true CN213387498U (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021719986.5U Active CN213387498U (en) | 2020-08-18 | 2020-08-18 | Double-brake lifting speed regulation control system of tower crane |
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| CN (1) | CN213387498U (en) |
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- 2020-08-18 CN CN202021719986.5U patent/CN213387498U/en active Active
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Address after: 213200 room 223, 168 Huacheng Middle Road, Jintan District, Changzhou City, Jiangsu Province Patentee after: Jiangsu Zhongjian Dafeng Mechanical Engineering Co.,Ltd. Address before: 213200 room 223, 168 Huacheng Middle Road, Jintan District, Changzhou City, Jiangsu Province Patentee before: JIANGSU ZHONGJIAN DAFENG MACHINERY ENGINEERING CO.,LTD. |