To ensure safe and reliable operation of lifting cranes equipped with better safety devices
To ensure safe and reliable operation of lifting cranes equipped with better safety devices, so that in case of an accident, protect parts or alert the operator attention, and thus play a security role.
1. Each hydraulic system relief valve: Can loop abnormally high pressure in order to prevent damage to the hydraulic pump and motor, and to prevent is overloaded.
2. Luffing crane safety device: When unexpected accident, boom luffing cylinder loop high-pressure hose or pipe burst or cut, the hydraulic circuit balancing valves to work, 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 operations.
3. Telescopic crane safety device: When unexpected accident, telescopic boom cylinder circuit pressure hose or pipe burst or cut, the hydraulic circuit balancing valves to work, lock cylinder from the lower chamber of the working oil, so hanging retract on their own, so as to ensure the safety of operations.
4. Height limit device: Hook rose from a predetermined height, touch weight limit, open limit switch, "over around" indicator light that is bright, and cut off the hook lifting, arm extended, boom V and other action to ensure safe operation. Then just manipulate the hook down boom boom retracted or looked up (ie safe side operation), etc. When the handle so that the limit hammer untying, normal operation is restored. For special occasions, such as the need for trace amounts still had around operation, press the release button on the meter box, this time limit will be lifted role, but this time the operation must be very careful to avoid accidents.
5. Leg locking device: When unexpected accident, leading to the legs of the vertical cylinder high-pressure hose or pipe rupture or cut, the hydraulic system can be blocked bidirectional hydraulic lock cylinder two legs blockade pressure oil chamber, so that the legs do not reduced or thrown, thus ensuring the safety of lifting operations.
6. From the weight indicator: Starting weight indicator is set in the basic arm together side (ie, the right side of the cab), the operator sitting in the control room will be able to clearly observed, can accurately indicate the boom elevation and corresponding conditions permitted rated lifting cranes.
7. Lifting characteristics Table: Set in the control room under the front wall, which lists the ratings of various arm lengths and various operating margin from under the weight and lifting height for easy reference during operation. When the lifting operation, must not exceed the values specified in the table.