L48A1 Mast Section Debugging method of trolley luffing tower crane hoisting moment limiter
1. When the hook is no-load, use a screwdriver to distinguish and press down the travel switches 1, 2 and 3, and confirm whether the three switches are sharp and reliable.
① The travel switch 1 is a limit switch with 80% rated torque. Press the switch and the buzzer alarm will be given on the linkage platform.
② Travel switches 2 and 3 are limit switches with additional torque. When the switch is pressed down, the working power supply for the lifting mechanism to recover and the luffing mechanism to move forward is blocked, the lifting hook can only be lowered, the luffing trolley can only move backward, and the linkage platform is equipped with a light to flash and a buzzer to alarm continuously.
2. During the adjustment, the hook shall be quadrupled and the height of single breaking shall be less than 40m, and the lifting weight shall be slightly off the ground, and the trolley may run.
3. When the working range is 50m and the arm length is 50m, the trolley moves to 25m and the lifting weight is 2290kg. After the lifting weight is stable from the ground tower crane, adjust the adjusting screw 4 absolutely corresponding to the travel switch 1 to the travel switch 1, and then change the connection, and tighten the corresponding adjusting nut 7
4. Adjust the moment limiter according to the constant amplitude and variable code, and adjust the travel switch 2
5. Adjust the moment limiter and the travel switch 3 according to the fixed code and amplitude change.
