What are the safety devices of jib cranes?
In order to ensure the safe operation of the jib crane, the jib crane is also designed with many safety equipment, so that the safety of the machine and the operator can be well maintained in the event of an accident. So what are the safety equipment of jib cranes?
Boom elastic safety equipment: When an accident occurs and the high-pressure hose or oil pipe in the boom elastic cylinder circuit bursts or is blocked, 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 lift. It will retract by itself, and then ensure the safety of the operation.
2. Each relief valve in the hydraulic system: It can suppress abnormal high pressure in the circuit to avoid damage to the hydraulic oil pump and motor, and avoid overloading.
3. Height limit equipment: After the hook is raised to the specified height, touch the limit hammer, turn on the limit switch, and the "overwinding" indicator light will be on, which will block the lifting of the hook, the extension of the boom, and the extension of the boom. The safety is guaranteed by the operation of the volt-and-wait action. At this time, when the hook is lowered, the boom is retracted, or the boom is raised (ie, operate to the safe side), the limit weight is released from restraint, and the operation returns to normal. In special occasions, if you still need to make a small amount of bypass operation, you can press the release button on the instrument box, and the effect of the current limit will be eliminated, but the operation at this time is very careful to prevent accidents.
5. Outrigger locking device: When an accident occurs and the high-pressure hose or oil pipe leading to the straight cylinder of the outrigger is broken or cut, the two-way hydraulic lock in the hydraulic system can close the pressure oil in the two chambers of the outrigger and the cylinder, so that the outrigger can be locked. Do not retract or throw out, then ensure the safety of lifting operations.