Gantry crane working principle of the safety devices

  To ensure that a single girder  gantry crane  operation safety and reliability, the crane is 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.

      A hydraulic system, 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 luffing jib safety device: When the 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 work oil, the single girder gantry crane jib will not fall, thus ensuring job security.

     3 telescopic  hoist crane  safety device: When unexpected accidents, telescopic boom cylinder circuit of the high-pressure hose or pipe burst or cut off, the hydraulic circuit balancing valves on the work, lock cylinder lower chamber from the working oil, the suspension will retract themselves, thus ensuring the safety of operation.

     4 height limit device: single girder gantry crane hook to rise from the specified height after touching limit hammer, turn the trip switch, indicator lights that light off around the same time cutting off hook lift, crane extended, the boom volts to the operation of such action to ensure safety. Then just manipulate the hook down, boom boom retracted or looked up (to the Security side operation), 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 outrigger locking device: When unexpected accidents, leading to the single girder  overhead gantry crane  outrigger vertical cylinder high-pressure hose or pipeline rupture or cutting, hydraulic system can be bi-directional hydraulic lock cylinder two chambers blockade blockade outrigger pressure oil, the legs indented or throw, so as to ensure the safety of the lifting operation.