Gantry crane cable reel torque motor control part of the technological innovations

gantry crane cable drum drive motor is torque motor, the direction of their work only in one direction so that the cable reel recycling. Walking carts flap side of the cable is fixed by the motor-driven cable reel recycling, and to the other side is the cable tension by turning the motor torque to overcome the invert put the cable reel. In reaching the cable flap at large, to let in the motor drive forward roll, the sudden reversal of motor rotation torque to overcome the pull of full role on the cable, this force is quite large, so it is likely to cause damage to the cable . We rent Yidu projects outside 63T  bridge gantry crane  cables because of this causes serious wear and tear. To this end, we Yidu comprehensive mechanization squad leader Zhao Qiushun chef with years of experience in electrical, motor torque control loop for its rectification, to solve this problem, as follows.

   Rectification mainly torque motor control loop, the result is to make the motor torque to the cable car traversing at a fixed flap can temporarily stop working, to prevent a sudden change of direction, reducing the moment the cable suffered a big pull. As illustrated in Figure One is the improved electrical schematics, Figure 2 shows the original electrical schematics. We realize this process is mainly used in the running of the two trolley unit conversion limit switch (Figure K1, K2, Model LX19-222) in the cable flap about two meters were installed at the corresponding switch on the bezel , by switching the switch to achieve the collision stopper conversion.

BRIEF DESCRIPTION controls the entire process is as follows: When the carts to move forward, the icon ① circuit connected, time relay ST1 turned its speed make contact ST1 closed, then switch K1A, K2A in the closed state, K3 is limit torque motor brake, brake opens its status is closed, then the torque of the motor control circuit is ON, the motor running. When walking to the cable flap on the 1st stopper at a fixed time, K1 collision stopper, K1A disconnect, K1B closed power control loop torque motor, the motor stopped working. Carts continue to walk through the cable to the 2nd stop tailgate flap, K2 collision stopper, K2A disconnect, K2B closed, the torque motor control circuit through K1B, K2B formation pathway, the motor starts to operate again. This completes the flap around the cable short stops the motor torque is reduced by a large instantaneous cables tension.

Conversely, cars and carts to go back on the opposite. The beginning is K1B, K2B closed to achieve the torque motor is running, the line to the 2nd stopper at, K2 switch collision baffle, K2B disconnect, K2A closed control loop disconnect torque motor, the motor stops working, carts continue Walking back to the 1st baffle, K1 collision baffle, K1B K1A closed off, then torque motor control circuit through K1A, K2A formation pathway, electricity running again in order to achieve the purpose.

In order to prevent the cable carts stopped collapse under the action of gravity, walking in the control of the motor contactors and relays on two time ST1, ST2 (model JST-4), two time delay relay to disconnect Contact ST1, ST2 access roll torque motor control circuit to ensure carts can continue to run after stopping a short time. In addition to the torque motor braking torque motor control circuit limit access only opened its K3 brakes to get through. Also in the brake control circuit added a contactor MZ, its normally open contact access control loop walking carts, only cable reel system is powered motor circuit walk to get through, to prevent problems when walking to pull off the cable.

After rectification where there is a need to pay attention is to check the K1, K2 two changeover switch crank arm direction in the two stopper at the outside, crank arm must remain two switches are kept in the same direction, or torque motor does not will operate normally. Will pull off the cable.