Safety device of light crane
Light cranes are a new type of lifting machinery. We will place some safety devices when designing them. These are built to ensure the safety of our lives, mainly including the following safety devices.
1. Boom luffing: When an accident occurs and the high-pressure hose or tubing in the boom luffing cylinder circuit bursts or is cut off, the balance valve in the hydraulic circuit will work to lock the working oil from the lower cavity of the cylinder. Prevent the jib from falling, so as to ensure the safety of the operation.
2. Boom telescoping: When an accident occurs and the high-pressure hose or tubing in the boom telescoping cylinder circuit bursts or is cut off, the balance valve in the hydraulic circuit will work to lock the working oil from the lower cavity of the cylinder, so that the crane can be lifted. Will retract by itself to ensure the safety of the operation.
3. Height limit device: After the hook is lifted to the specified height, touch the limit weight, turn on the travel switch, the indicator light will light up, and cut off the hook lifting, boom extension, and boom Ensure safety by waiting for the operation of the action. At this time, as long as the hook is lowered, the boom is retracted or the handle is raised, the limit weight is released from the restraint, and the operation returns to normal. In special occasions, if you still need to do a small amount of bypass operation, you can press the release button on the meter box, and the function of the limit will be released at this time, but the operation at this time is very careful to prevent accidents.
4. Relief valves in the hydraulic system: It can suppress the abnormal high pressure in the circuit to prevent damage to the hydraulic oil pump and motor, and to prevent overloading.
5. Outrigger locking device: When an accident occurs and the high-pressure hose or tubing leading to the vertical cylinder of the outrigger is broken or cut, the two-way hydraulic lock in the hydraulic system can block the outrigger and block the pressure oil in the two chambers of the cylinder, so that the support The legs are not retracted or thrown out to ensure the safety of lifting operations.
6. Lifting weight indicator: The lifting weight indicator is set on the closing side of the basic arm. The operator can clearly observe while 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: set on the lower wall panel of the front side of the control room, this table lists the rated lifting weight and lifting height under various boom lengths and various working ranges for easy reference during operation. During the lifting operation, the value specified in the table must not be exceeded. In order to ensure the safety and reliability of the lifting operation, the crane is equipped with a more complete safety device to protect the machine parts or remind the operator to pay attention to the safety protection in the event of an accident.
When we use light cranes, in order to ensure safe and reliable lifting operations, we will install more complete safety devices on the equipment, so as to protect the parts or remind the operators to pay attention to safety in the event of accidents. Protective effects.
