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What are the safety devices of cranes?

Time: 2018-12-04 13:36

What safety devices do cranes have in order to ensure the safety and reliability of lifting operations? Cranes are equipped with more perfect safety devices so that they can play a protective role in case of accidents.

1. every relief valve in the hydraulic system can suppress abnormal high pressure in the circuit to prevent damage to the hydraulic oil pump and motor and prevent overload.

2. swing arm safety device: when accident occurs, the high pressure hose or tubing burst or cut off in the loop of the boom luffing cylinder circuit, the balancing valve in the hydraulic circuit acts as a working oil to lock the working oil from the lower part of the oil cylinder so as not to cause the boom to fall, thus ensuring the safety of the operation.

3. telescopic boom safety device: when accident occurs, the high pressure hose or tubing burst or cut off in the telescopic oil cylinder loop of the boom, the balancing valve in the hydraulic circuit acts as a working oil to lock the working oil from the lower part of the oil cylinder, so that the crane itself will be retracted, so as to ensure the safety of the operation.

4. height limit device: after lifting the hook to the required height, touch the heavy hammer, open the stroke switch, turn over the indicator light, and cut off the lifting operation of the hook, the extension of the boom and the operation of the boom to ensure safety. At this time, as long as the hook is lowered, the boom is retracted or the boom is lifted up, that is, when the handle is operated on the safe side, the limit weight is lifted and the operation is restored to normal. On special occasions, if the micro winding operation is still needed, the release button on the instrument box can be pressed. The function of the limit will be relieved at this time, but the operation at this time must be very careful and careful to prevent accidents.

5. leg locking device: when accident occurs, when the high pressure hose or tubing is broken or cut to the vertical hydraulic cylinder of the outrigger, the two-way hydraulic lock in the hydraulic system can block the pressure oil of the leg blocking the two chamber of the oil cylinder, so that the outrigger does not shrink or throw out, thus ensuring the safety of lifting operation.

The 6. weight indicator: the weight indicator is set on the side side of the basic arm (that is, the right side of the control room). The operator can observe clearly in the control room and accurately indicate the elevation angle of the boom and the rated lifting capacity permitted by the crane under the corresponding working conditions.

The 7. lifting characteristic table is set on the front side wall panel of the control room, which lists the rated lifting and lifting height of various arm lengths and various working ranges, so that it can be consulted during operation. When lifting work, do not exceed the value specified in the table. In order to ensure the safety and reliability of lifting operations, the cranes are equipped with more perfect safety devices so as to protect the machine parts or remind operators to pay attention when accidents happen, so as to play a safety protection role.