L68A1 Mast SectionCauses of tower crane slide hook and measures to prevent it
1. Causes of tower crane sliding hook
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(1) The fixed screws of the contactor power supply inlet and outlet wires in the tower crane distribution box are loose, the connection bolts of the terminal board are in poor contact, and the main contact of the contactor is in poor contact.
(2) The connection bolts of the motor rotor and stator coil are in poor ablation contact.
(3) The wear of brake pads of high and low speed motors exceeds the specified requirements.
(4) The transmission gear is damaged and the fixed gear bolt is loose.
(5) The phase loss protector does not work.
(6) Limiter failure
2. Measures to prevent tower crane from sliding hook
(1) The driver shall calm down after the phenomenon of slipping hook occurs in the work, and inform the signalman in time to let the ground personnel go away. Operate in accordance with the operation regulations, lift the hook, turn the arm, walk the trolley, etc., and place the heavy objects in the unmanned area on site.
(2) Do a good job in the safety inspection before, during and after the shift, and conduct the inspection in the form of eyes, ears and hands.
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(3) Check and fasten the connection points of various lines irregularly.
(4) Regularly check whether the brake pads of each brake are normal, whether the motor wiring bolts are in good contact, and whether the main contact of the contactor is normal.
(5) The maintenance personnel shall be responsible for the work, do it in strict accordance with the requirements of the safety operation procedures, replace the parts to be replaced, and do a good job of inspection and test run after the work.
(6) Check the working condition of the limiter regularly and select the genuine limiter.
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