Double beam crane safety device

To ensure the safe operation of the double girder cranes, the crane is also designed with a number of safety devices to protect the safety of the machine and the operator in the event of an accident. So what is the safety device for the double girder crane?

1. Boom telescopic safety device:

When an accident occurs and the high pressure hose or line in the boom telescopic cylinder circuit bursts or shuts off, the balancing valve in the hydraulic circuit is used to lock the working oil in the lower chamber of the hydraulic cylinder so that the crane can retract itself. Make sure the job is safe.

2. Boom luffing safety device:

When an accident occurs and the high pressure hose or pipe in the boom variable cylinder circuit bursts or cuts, the balancing valve in the hydraulic circuit is used to lock the working oil from the lower chamber of the cylinder, so that the boom will not autumn. Make sure the job is safe.

3. Each safety valve in the hydraulic system:

It suppresses abnormal high voltages in the circuit to prevent damage to the hydraulic pump and motor and prevent overload.

4. Height limit device:

When the hook is raised to the specified height, it will hit the limit weight and open the travel switch. The “Over-winding” indicator lights up and performs the hooking, lifting the boom, lifting the boom, etc., and ensuring safety. At this time, as long as the operation hook is lowered, the boom is retracted or the boom is lifted (ie, operated to the safe side), the weight is restricted from being released from the restraint, and the operation returns to normal. In special cases, if a slight winding operation is still required, press the release button on the meter box to release the limit action, but be careful to avoid accidents during operation.

5. Lifting characteristics table:

Located on the front lower wall of the control room, the watch lists various boom lengths and various lift lengths and lift heights for various operating ranges for easy access during operation. When lifting work, do not exceed the values specified in the table. In order to ensure safe and reliable lifting work, the crane is equipped with a complete safety device to protect the machine or to alert the operator in the event of an accident, thus providing safety protection.

6. Leg locking device:

The bi-directional hydraulic lock in the hydraulic system prevents the pressure oil in the leg from blocking the two chambers of the leg when an accident occurs and the high pressure hose or pipe leading to the vertical cylinder of the leg is broken or severed. The tube is to prevent the leg from contracting or scooping out. This ensures the safety of the lifting work.

7. Weightlifting indicator:

The lifting weight indicator is placed on one side of the basic arm (ie, on the right side of the operating room), which can be clearly observed by the operator while sitting in the operating room, and can accurately indicate the elevation angle of the boom and the operating lever. The crane is under the corresponding working conditions. Allowable rated lifting capacity.

In addition, the crane must be operated in accordance with the safe operating rules of the crane to avoid accidents.