Method for manufacturing box counterweight of crane without surface bulges

Abstract

The invention relates to the field of construction machinery, in particular to a method for manufacturing a box counter weight of a crane without surface bulges, comprising the following steps of: (a) blanking, assembling and welding a box body, carrying out kerosene seepage test on the periphery of an outer frame, and testing whether welding seams have leakage or not; (b) welding reinforcing ribplates in the counterweight box body without leakage, wherein the reinforcing rib plates divide the interior of the box body into small filling chambers; (c) stacking steel plates in the filling chambers, filling fine sand into spaces among the steel plates in the chambers and punching to solid; and (d) casting mortar on the surfaces of the steel plates, and welding a cover plate to seal the counterweight box body. In the method, a structure that waste steel plates is filled in the hollow box body is adopted to reduce the cost and be convenient for site fabrication; the box body is internallyis provided with partitions, iron sand is filled among the steel plates, and mortar is cast on the surfaces of the steel plates, so that the internal filling densely forms a whole to effectively prevent surface bulges caused by air leakage.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a method for preparing a crane box-type counterweight that prevents surface swelling. Background technique [0002] Cranes are commonly used construction machinery, and their counterweights are often made of solid iron. This preparation method is expensive, and it cannot be made on site during the construction process of the crane. Therefore, box-type counterweights with hollow structures appear. The box body is usually welded on site according to the required size, and then filled with fillers in the box and welded with the cover plate. However, in the production process of this kind of counterweight, there are gaps due to the external sealing and internal filling process. As the temperature changes, the gap in the box will expand due to the infiltration of air, which will cause bulges on the surface of some counterweights, resulting in uneven contact surfaces between the up...

AI Technical Summary

Problems solved by technology

[0002] Cranes are commonly used engineering machinery, and their counterweights are often made of solid iron casting. This preparation method is expensive, and it cannot be made on site during the construction process of the crane, so box-type counterweights with hollow structures appear. The box body is often welded on site according to the required size, and then filled with fillers in the box and welded with the cover plate. However, in the production process of this kind of counterweight, there are gaps due to the external seal and the internal filling process. As the temperature changes, the space in the box will expand due to the infiltration of air, which will cause bulges on the surface of some counterweights, resulting in uneven contact surfaces between the upper and lower counterweights, which will affect the balance of the crane.

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