L68B1 Mast SectionHow to solve the problem of unloading failure of tower crane from two aspects of circuit and liquid circuit?
when the crane overload or overswing operation, the crane electrical system or hydraulic system failure, can lead to crane unloading failure. How to check from the circuit and the liquid path two aspects, solves this problem.
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1. Check the circuit. The purpose of checking the circuit is to check whether the Torque limiter and limit switch can transmit the electric signal to the unloading solenoid valve as well as the warning signal of the indicator lamp provided to the panel The unloading circuit will be connected to realize the safe unloading, otherwise, the safe unloading will fail. 2. Check the flow path, check the flow path, first check the distribution pipe, no errors, finally focused attention on the logic valve, logic valve, suspected that the valve inside the one-way valve spring harder or smaller diameter valve The back pressure of unloading oil circuit is large, which leads to unblocked unloading oil circuit and difficult unloading. The pressure of an or BN port corresponding to the action is measured in the alarm state, and it is found that the pressure is about 1MPA, while the main valve only needs about 0.6 MPA of pilot pressure to open, which proves that the suspicion is correct, precisely because the back pressure in the logic valve is large, that caused the unloading problem.
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