Double beam bridge crane control system

Under normal circumstances, the electrical control system of a double-beam bridge crane is divided into two parts: the lifting part is on the crane end beam, and the lifting part and the trolley running part are on the hoist, which runs with the car. The current layout is to put the electric control part of the trolley, cart, and lifting system in the same position, all on the terminal beam. The dual control is also called centralized control.

The advantage of this arrangement is that the service life of the system can be prolonged, because the instability of the suspended crane on the crane makes the electrical control system unavoidable from repeated swings. The swing of the electrical control system under working conditions is one of the important reasons for the failure; the overall electrical control on the end beam is not limited by space, and the electrical control box can be enlarged to facilitate the addition of electrical components such as inverters, fans, and resistors. Our existing inverter crane control boxes are uniformly installed on the end beams. It can be seen to reduce the damage at both ends of the box girder.

Different arrangements of the drive control system of the electric hoist double-beam crane. For the LH type double girder crane, since the double girder trolley will not swing back and forth, the LH type double girder crane can meet the space requirements of the control box; the most important thing is that the double girder trolley can use two control boxes at the same time. The central control box is placed on the car, which simplifies the wiring and saves a lot of redundant cables.

Simplification of the relay logic function of the PLC control system of the double-beam bridge crane: In the design, it should be noted that not all relay logic should be replaced. Certain important logics (such as control relays and mechanism relays of the main contact) require double interlocking between the relay and the PLC.

Special functions are completed in the PLC control system of the double-beam bridge crane: the special functions of the double-beam bridge crane generally require PLC to be realized. Nowadays, many brands of inverters have launched hoisting application macros and hoisting special process cards. Using these application macros and process cards to complete hoisting special functions can simplify the design process, with strong performance, good reliability, easy debugging, and low cost. It is recommended to use it first. . When you need to use PLC for programming, you should pay attention to the modularization of related programs as much as possible, and reduce the connection between the module and the main program, so that it can be transplanted in similar applications in the future.

The PLC control system can detect and control the faults of the double-beam bridge crane, assist in fault finding, and avoid fault expansion: In order to achieve this goal, it is necessary to collect as much system information as possible on the PLC. It is recommended to use PLC to collect the position signal of each device. This includes but is not limited to circuit breakers, contactors, relays, brakes, limit switches, safety devices, etc. If all the signals are collected, we can know exactly whether each instruction is executed correctly after it is issued. If you find that the instruction is not executed correctly, you should immediately call the police, stop the operation or execute the fault handling program to avoid further expansion of the fault. The fault location of the double-beam bridge crane is analyzed for reference by maintenance personnel.

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