Horizontal precision adjusting method during hoist of prestressed forging hydraulic press beam and adjusting device

Abstract

The invention discloses a steel rope length adjusting device and a horizontal precision adjusting method during the hoist of a prestressed forging hydraulic press beam by the device. The method comprises the following steps: hoisting an upper beam by four steel ropes in same length; after the upper beam is stabilized, detecting horizontality; mounting the steel rope length adjusting device on thethree lower steel ropes and adjusting the length of the three steel ropes; repeatedly measuring the horizontality and correspondingly adjusting the length of the steel ropes till the horizontality ofthe upper beam is 0.10mm / M at most; coating lubricating agent on the matching surface of four positioning holes of the upper beam and outer cylinders of the end parts on four prestressed press sleeves; hoisting the upper beam to the upper parts of the prestressed press sleeves, aligning the four positioning holes of the upper beam and the outer cylinders of the end parts of and four prestressed press sleeves and leading the upper beam to slowly fall in position. The device can accurately adjust the length of the steel ropes, the method is simple to operate, and the problem of injury or clamping between the outer cylinders of the prestressed press sleeves and the positioning holes of the upper beam during the hoist of the prestressed forging hydraulic press beam is solved.

Description

Technical field [0001] The invention belongs to the technical field of heavy machinery and equipment manufacturing and on-site equipment installation, and relates to a method and device for assembling or using on-site installation and hoisting of a large prestressed forging hydraulic machine beam in a manufacturing plant, and specifically relates to a method for adjusting the horizontal accuracy during hoisting of a prestressed forging hydraulic machine beam , The present invention also relates to the lifting adjusting device used in the method. Background technique [0002] Large-scale pre-stress forging hydraulic presses are generally in the form of three beams and four (or two-column) columns. In order to improve the rigidity of forging hydraulic presses, the four-column (or two-column) adopts a pre-stressed structure, that is, a pre-stress is set between the upper and lower beams at the axis of the tension column. Compression sleeve, after the hydraulic press is installed, pr...

AI Technical Summary

Problems solved by technology

Since the three girders of a large forging hydraulic press have a relatively large weight, generally about 100T to 300T, it is a common process to hoist the upper girder with four steel rope slings of equal length when assembling in the factory or on site. The lengths of the four steel rope slings cannot be made to be absolutely equal, even the length parameters given by professional steel rope sling manufacturers are also marked as "effective length" or "approximate value" (see "China Wire Rope Network" ), at the same time, the upper beam is a steel casting, and the geometric centers of its four lifting lugs and the actual center of gravity of the beam cannot be absolutely coincident. It is difficult to level it within 0.1 mm per meter during hoisting. In the technical literature "Heavy Machinery Process Manual" Volume 2 (edited by China First Heavy Machinery Group Corporation, published by Harbin Publishing House), on page 993, in the section 6.1.23 Safety and Lifting, there is no instruction on how to accurately adjust the level when hoisting workpieces related information

Due to the heavy weight of the upper beam, if the hoisting is not level, the positioning hole between the outer cylinder of the prestressed compression sleeve and the beam is likely to be ground or seized, and severe cases will cause equipment and personal safety accidents

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