Overview of crane types of safety devices

Crane is a large device, there are certain risks of its own nature, so in order to ensure safe and reliable lifting operation, designed a number of safety devices to ensure safety,overhead gantry crane play a security role.
Crane safety device has:
A hydraulic system of the pressure relief valve
Inhibit loop abnormally high pressure in order to prevent damage to the hydraulic pumps and motors, and to prevent is overloaded.
2 safety devices luffing jib
When unexpected accident, boom luffing cylinder loop pressure hose or pipe burst or cut off, the hydraulic circuit balancing valves on the work, lock cylinder lower chamber from the working oil,bridge gantry crane so that the boom will not fall, thus ensure job security.
3 telescopic crane safety device
When unexpected accidents, telescopic boom cylinder circuit high pressure hose or tubing burst or cut off, the hydraulic circuit balancing valves on the work, lock cylinder lower chamber from the working oil to make hanging retract on their own, thus ensure job security.
4 height limit device
Hook up the required height to rise after touching limit hammer, turn the trip switch, "over round" indicator light that is bright, while cutting off the hook lifting, boom stretched out, boom volts to the operation of such action and to ensure safety. Then just manipulate the hook down, boom boom retracted or looked up (to the Security side operation),hoist gantry crane etc. handle, lift the weight limit constraint, the operation returns to normal. For special occasions, such as still need to make a small amount of over-winding 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 prevent accidents.
5 leg locking means
When unexpected accidents, leading to the legs vertical cylinder high-pressure hose or pipeline rupture or cutting, hydraulic system can be bi-directional hydraulic lock cylinder two blockade blockade outrigger pressure oil chamber, so that the legs indented or thrown, so as to ensure the safety of the lifting operation.
6 from the weight indicator
Indicator is set from the weight of the aggregate of the basic side arm (i.e. the right side of the cab), the operator sitting in the control room can be clearly observed, can accurately indicate the elevation angle of the  jib crane  and the corresponding conditions permissible rated capacity.
7 Lifting Characteristics Table
Set in the control room on the front side of the next wall, the table lists the various arm lengths and a variety of work under the nominal weight range and lifting height for operation inspection. Lifting operation, must not exceed the values ​​specified in the table. To ensure safe and reliable lifting operations, crane equipped with a better safety devices in order to unexpected circumstances, play a protective parts or alert the operator, and thus play a security role