A sideways turning method of a large flat frame type workpiece

Abstract

The invention relates to a laterally turning method of a large panel framework type workpiece. The laterally turning method comprises the following steps: firstly, putting the workpiece horizontally, and hoisting by adopting a crane, wherein a forged steel bilateral hooked head is adopted for hoisting; secondly, arranging two hoisting points along the length direction; thirdly, hoisting by four equal-length steel wire ropes; fourthly, binding the workpiece horizontally at the hoisting point I and the hoisting point II respectively by adopting the same mode; fifthly, adjusting the steel wire ropes so as to enable the reservation length of the head parts to be equal to that of the tail parts; sixthly, hanging the steel wire ropes to the bilateral hook head respectively; and seventhly, hoisting the workpiece by the crane slowly, wherein one side of the workpiece is always kept to be in contact with the ground in the hoisting process until the workpiece turns over by 90 degrees. Compared with the prior art, the laterally turning method has the beneficial effects that the lateral turning operation of the large panel framework type workpiece can be completed by only one crane and the steel wire ropes, so that the time and cost waste for designing and manufacturing a special lifting appliance is prevented; the rotation operation and the turning operation of the laterally erected workpiece also can realized; the laterally turning method is simple, feasible, safe and reliable.

Description

technical field [0001] The invention relates to the technical field of hoisting of large workpieces, in particular to a rollover method for large flat frame workpieces. Background technique [0002] In the process of processing workpieces of large flat frame structure such as rolling mill racks (also known as arches), it is often necessary to perform operations such as turning over and standing on the side of the workpiece. For the overturning of such workpieces, several groups of pulleys or main and auxiliary hooks or two cranes are usually used to complete the overturning operation in the air on both sides of the workpiece. For example, the Chinese patent with application number 201210208261.3 (application date is June 19, 2012) discloses "a support device used when turning over a large workpiece and a method for lifting one end of a large workpiece", which is generally used in workpiece binding It is convenient or the workpiece has lifting lugs. [0003] When the shape ...

AI Technical Summary

Problems solved by technology

[0004] However, designing and manufacturing special hoisting tools is not only time-consuming, but also increases costs, especially for non-standard equipment, special hoisting tools are equivalent to one-time use, resulting in greater waste

Therefore, at present, processing workshops usually use several steel wire ropes to bind the workpiece on both sides to turn over or stand sideways. One side of the wire rope is transferred to the other side of the wire rope, resulting in a huge instantaneous impact load, which is prone to rope breakage accidents, and due to the inertial force of the overturn, the workpiece will swing from side to side to a large extent, which will also pose a threat to the safety of the surrounding workers.

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