News Detail
In order to ensure the safety and reliability of the lifting operation, the crane is equipped with a more perfect safety device, so that in the case of accidents, to protect the parts or remind the operator attention, so as to play a role in safety protection.
1. The relief valve in the hydraulic system: it can suppress the abnormal high pressure in the circuit to prevent the damage of the hydraulic oil pump and motor, and prevent the overload state.
2. Boom luffing safety device: when unexpected accidents occur, the high pressure hose or tubing in boom luffing cylinder circuit is burst or cut off, the balance valve in the hydraulic circuit will play a role, locking the working oil from the lower chamber of the cylinder, so that the boom will not fall, so as to ensure the safety of operation.
3. Boom telescopic safety device: when an accident occurs, the high-pressure hose or tubing in boom telescopic cylinder circuit is burst or cut off, the balance valve in the hydraulic circuit will play a role, locking the working oil from the lower chamber of the cylinder, so that the crane will retract itself, so as to ensure the safety of operation.
4. Height limit device: after the hook is lifted to the specified height, touch the limit hammer, open the travel switch, the "over winding" indicator light is on, and cut off the hook lifting, lifting arm extending, lifting arm falling to other operations to ensure safety. At this time, as long as the hook is operated down, the lifting arm is retracted or the lifting arm is raised (to the safety side operation) and other handles, the limit weight is lifted, and the operation is back to normal. In special occasions, if you still need to do a small amount of overwinding operation, you can press the release button on the instrument box, at this time the role of the limit will be lifted, but at this time the operation must be very careful to prevent accidents.
5. Leg locking device: when an accident occurs, the high pressure hose or tubing leading to the vertical cylinder of the leg is broken or cut, the two-way hydraulic lock in the hydraulic system can block the pressure oil of the two chambers of the cylinder, so that the leg does not shrink or swing out, so as to ensure the safety of the lifting operation.
6. Lifting indicator: the lifting indicator is set on the side of the basic arm (namely the right side of the control room). The operator can clearly observe it when sitting in the control room, and can accurately indicate the lifting Angle of the boom and the rated lifting weight allowed by the crane under the corresponding working conditions.
7. Lifting characteristics table: set on the lower wall panel in the front of the control room, this table lists the rated lifting weight and lifting height under various arm lengths and various working ranges, so that the operation can be consulted. Lifting operation, must not exceed the value specified in the table.