Lifting machinery safety technology 30, what are the safety protection devices of cranes

In order to ensure the safety and reliability of the lifting operation, the crane is equipped with a more complete safety device, so as to protect the parts or remind the operator to pay attention in case of accidents, so as to play a role in safety protection.

1.Relief valves in the hydraulic system: can suppress the abnormal high pressure in the circuit to prevent damage to the hydraulic oil pump and motor, and prevent it from being in an overload state.

2.Boom luffing safety device: When an accident occurs, the high-pressure hose or oil pipe in the boom luffing cylinder circuit bursts or is cut off, the balance valve in the hydraulic circuit plays a role to lock the working oil from the lower cavity of the cylinder, so that the boom will not be the best to ensure the safety of the operation.

3.Boom telescopic safety device: When an unexpected accident occurs, the high-pressure hose or oil pipe in the boom telescopic cylinder circuit bursts or is cut off, the balance valve in the hydraulic circuit will play a role to lock the working oil from the lower cavity of the cylinder, so that the crane will retract by itself, so as to ensure the safety of the operation.

4.Height limiting device: After the hook is lifted to the specified height, touch the limiting hammer and open the travel switch"Overwinding"The indicator light will be on, and at the same time, the operation of the hook lifting, the boom extending, and the boom falling will be cut off to ensure safety.

5.Outrigger locking device: When an unexpected accident occurs, the high-pressure hose or oil pipe leading to the vertical cylinder of the outrigger is broken or cut, the two-way hydraulic lock in the hydraulic system can block the pressure oil of the two chambers of the outrigger cylinder, so that the outrigger does not shrink or throw out, so as to ensure the safety of lifting operations.

6.Lifting weight indicator: The lifting weight indicator is set on the side of the basic arm (i.e., the right side of the control room), and the operator can clearly observe it when sitting in the control room, and can accurately indicate the elevation angle of the boom and the allowable rated lifting capacity of the crane under the corresponding working conditions.

7.Lifting characteristics table: arranged on the front side lower wall panel in the control room, the table lists the rated lifting capacity and lifting height under various arm lengths and various working ranges, so as to consult during operation. When lifting operations, do not exceed the values specified in the table.

1. The overload limiter is a full protection device for the crane to prevent overloading, also known as the lifting weight limiter. Its safety function is to stop the lifting action when the lifting load of the crane exceeds the rated value, so as to avoid accidents caused by overloading. Overload limiters are widely used on overhead type cranes and lifts.

2. The torque limiter is a comprehensive safety protection device for the boom crane. The torque limiter consists of a load detector, an arm length detector, an angle detector, a condition selector and a microcomputer.

3. The buffer is a safety device configured at the end of the metal structure of the rail-running crane, which has the safety function of absorbing the collision kinetic energy of the running mechanism and slowing down the impact. The main indicators of the safety inspection of the buffer are whether the installation is firm and reliable, whether the components are intact and the ability to absorb kinetic energy.

4. The windproof and anti-skid safety device is a safety device to prevent the crane working in the open air from sliding along the track under the action of strong winds, and the rail-mounted cranes working outdoors should be installed. Its safety function is that when the crane encounters the maximum wind force of wide infiltration in the non-working state, the crane will not be blown to prevent the crane from overturning at the end of the track. Common windproof devices include rail clamps, anchoring devices, and iron shoes.