256HC Mast Section Which safety devices must be installed when tower crane is installed
The following introduces several important safety devices, remind the vast number of tower crane users installed when the installation of the installation. 1 Height limit device, lifting the hook to the specified height, touch the limit weight, open the stroke switch, and turn on the indicator light At the same time, cut off the lifting hook, crane arm extended, crane arm to the operation of such actions to ensure safety.
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At this point, as long as the Control Hook down, the tower crane arm retracted or crane arm raised to the safety side operation of such a handle, so that the limit weight to release the constraints, the operation is back to normal. In special occasions, if you still need to make micro bypass operation, you can press the release button on the instrument box, this time the role of the limit will be lifted, but at this time the operation must be very careful to prevent accidents. 2 Boom luffing safety device, when unexpected accident happens, the high pressure hose or oil pipe in the boom luffing cylinder circuit of tower crane will burst or be cut off, the Balance Valve in the hydraulic circuit will work to lock the working oil from the lower chamber of the oil cylinder The tower crane arm does not fall, thus ensuring the safety of the operation. 3 tower crane boom telescopic safety device, when unexpected accidents occur, boom telescopic cylinder circuit in the high-pressure hose or tubing burst or cut off, the hydraulic circuit in the Balance Valve will work, locking the working oil from the lower chamber of the cylinder, the crane will retract itself to ensure the safety of the operation. The overflow valves in the hydraulic system can restrain the abnormal high pressure in the circuit to prevent the damage of the hydraulic oil pump and the motor, and to prevent being in the overload state.
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