290HC Mast Section What if the crane doesn't work? How to solve the problem of tower crane operation failure
In the operation of the tower crane should always pay attention to the operation status of the tower crane, in order to ensure the safe work of the tower crane so as to improve the efficiency of the work. If problems are found, it will be late to prevent them, especially in large-scale engineering operations. It is likely to cause major tower crane accidents. So tower drivers have to be extra careful at work. How to solve the operation failure of the safety protection device when overloading or overloading.
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Electrical system or hydraulic system failure, can cause tower crane operation failure. Below, to the circuit, the liquid road inspection work, do the following analysis.
1, Circuit detection
The purpose of circuit detection is to check whether the power moment limiter and the limit switch can also transmit the electrical signal to the discharge solenoid valve while providing the panel indicator signal. If so, the discharge loop will be connected to achieve safe unloading. Otherwise, Safety discharge will fail.
2, check the liquid road
After checking the circuit, check the liquid road. First, check the cloth pipe. There was no error. Finally, the attention was focused on the logical valve. It was suspected that the spring of the one-way valve in the logic valve was harder or the diameter in the valve was smaller, making the discharge oil. Road back pressure is larger, Cause unloading oil road is not smooth, unloading is difficult. Therefore, in the state of alarm, the pressure of an or BN corresponding to the action was measured and the pressure was found to be about 1 MPa. The main valve only needed about 0.6 MPa of pilot pressure to open. This proves that the suspicion is correct. It is precisely because the back pressure in the logic valve is large. To make it difficult to unload.
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