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How does the height limit device of the gantry crane work?

April 28, 2022

To a certain extent, the gantry crane is a bridge type crane in which the bridge frame is supported on the ground track by its legs on both sides. Structurally, it is composed of a mast, a cart operating mechanism, a crane trolley, and electrical parts. Some gantry cranes only have outriggers on one side, and the other side is supported on the factory building or trestle bridge. They are called semi-gantry cranes.


The upper part of the gantry crane (including main beam and end beam), outriggers, and lower cross beams are composed of the upper part of the bridge frame (including the main beam and the end beam). In order to expand the operating range of the crane, the main beam can extend beyond the outriggers to one or both sides to form a cantilever. A crane with a boom can also be used to expand the crane's operating range through the pitch and rotation of the boom.


The height limit device of the crane is an indispensable configuration, let's take a look at how it works!


After the hook is raised to the specified height, touch the limit weight, turn on the travel switch, the "over-winding" indicator light will light up, and cut off operations such as hook lifting, boom extension, and boom down And to ensure safety. At this time, as long as the handle is operated such as lowering the hook, retracting the boom or raising the boom (that is, operating to the safe side), the limit weight is released from the restraint, and the operation returns to normal. In special occasions, if you still need to do a small amount of bypass operation, you can press the release button on the meter box, and the function of the limit will be released at this time, but the operation at this time must be very careful to prevent accidents.


When designing the main girder structure of the gantry crane, the rigidity and strength of the main girder must be sufficient, and at the same time, it must be well coordinated with the operation mechanism of the large and small vehicles to ensure normal operation; considering that the weight reduction of the main girder will help improve the economy Therefore, the self-weight structure design can be reduced as much as possible.


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