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Safety Device for Cranes
Jan 10, 2018

1. Hydraulic system in the overflow valve: can inhibit the circuit in the abnormal high pressure to prevent the hydraulic pump and motor damage, and to prevent overload state.

2. Boom luffing safety device: When an accident occurs, the boom variable amplitude cylinder circuit in the high-pressure hose or tubing burst or cut off, the hydraulic circuit in the balance valve function, lock from the oil cylinder under the cavity of the work of oil, so that the jib does not fall, so as to ensure the safety of the operation.

3. Boom Telescopic safety device: When an accident occurs, boom telescopic cylinder in the loop of high-pressure hose or tubing burst or cut off, the hydraulic circuit in the balance valve function, lock from the oil cylinder under the cavity of the work of oil, so that the hanging will retract itself, so as to ensure the safety of the operation.

4. Height limit device: Hook up to the specified height, touch-limit heavy hammer, open the stroke switch, "over around" indicator light is bright, while cutting off the hook lifting, hanging arm out, hanging arm volts to the operation of the action and ensure safety. At this point, as long as the control of the hook drop, the boom retracted or lifting arm back (that is, to the safe side operation), such as the handle, so that the limit of the heavy hammer lifting the constraint, operation that return to normal. In special occasions, if you still need to do a trace of the operation, you can press the release button on the Instrument box, the role of the limit will be lifted, but at this time the operation must be very careful to prevent accidents.


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