Portal crane

Abstract

The invention relates to a portal crane. The portal crane comprises a crane body and a moving mechanism arranged at the bottom of the crane body; the crane body comprises a pair of bases, lifting mechanisms arranged on the bases, a cross beam connected between the tops of the lifting mechanisms and a slidable lifting sling which is movably arranged on the cross beam; the slidable lifting sling comprises a drive lifting sling body, a driven lifting sling body connected with the drive lifting sling body and a power part used for driving the drive lifting sling body to slide; and the drive lifting sling body comprises fixing brackets, lifting plate assemblies connected to the fixing brackets and rolling assemblies connected to the bottoms of the fixing brackets, the rolling assemblies are arranged on the cross beam, and the power part is located under the cross beam. According to the portal crane, displacement and adjustment of the lifting sling on the cross beam are achieved, the slidingdistance is increased, sliding is more convenient and more flexible, and maintenance is not needed; and a modular car or a guide rail can be adopted as the moving mechanism, and therefore selection is flexible and diverse.

Description

Technical field [0001] The invention relates to a hoisting machine used in the fields of construction, power manufacturing, large-piece installation, transportation and the like, and in particular to a gantry crane. Background technique [0002] At present, the spreaders set on the gantry cranes on the market are usually fixed. When heavy objects need to be lifted: the gantry crane moves through the track, so that the spreader is aligned with the heavy object to complete the lifting, but because the track is relatively fixed, once the position of the heavy object cannot be passed Moving the alignment on the track will cause lifting difficulties. Therefore, mobile spreaders appeared on the market. In order to realize movement, similar spreaders on the existing market generally adopt static friction, that is, use low-friction materials to realize the movement of the spreader relative to the track. The power of the spreader slip is usually pulled by a hoisting wire rope. The use o...

AI Technical Summary

Problems solved by technology

The power for the slippage of the spreader is usually pulled by the hoisting wire rope, which has the disadvantages of complex structure and frequent maintenance of the wire rope; even if it is pushed and pulled by the oil cylinder, the oil cylinder is also arranged on the beam of the gantry crane. Above, due to the limitation of space, the length of the cylinder is limited so that the stroke of the cylinder is very short, resulting in a very short sliding distance

[0003] In addition, the gantry cranes (gantry cranes) currently on the market have both wheel-rail type and tire type, but according to the needs, they can not only use the module car as the chassis, but also can walk on the special guide rail according to the needs and realize it through the lifting of the oil cylinder. There is no lifting function

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