Axial pre-tightening pull rod device

Abstract

The present invention discloses an axial pre-tightening pull rod device, and aims to solve the problem that roller boxes are easy to jump. The axial pre-tightening pull rod device can help avoid jump of the roller boxes, and comprises two roller boxes, the roller boxes are provided with countersinks, major diameter sections of the countersinks of the two roller boxes are opposite in direction, the countersinks of the two roller boxes sleeve pull rods, parts of the pull rods corresponding to the two roller boxes are provided with plus threads and left-hand threads, the pull rods are connected with the roller boxes through double thread pair locking mechanisms, the double thread pair locking mechanism comprises an axial elastic mechanism, first nuts and second nuts, the elastic mechanism, the first nuts and the second nuts sleeve the pull rod in turn from an end part to the middle part, both the first nuts and the second nuts are arranged in a spaced manner, the second nuts contact and are pressed against a stepped position of the countersink of the roller box, an end cover tightly presses the first nuts through the axial elastic mechanism, the distance between the end cover and the first nuts is smaller than the original length of the axial elastic mechanism, the first and second nuts and the counter sink are circumferentially and fixedly arranged, and threads of the first and second nuts are opposite to threads of the pull rods. With adoption of the axial pre-tightening pull rod device provided by the invention, jumps of the roller boxes can be prevented, and the rolling quality is raised.

Description

technical field [0001] The invention relates to an axial pretensioning rod device. Background technique [0002] The rod, wire and section steel rolling mill is the core process equipment in the steel rolling process, and its function is to roll and shape the billet. The tie rod device is an important device in the rolling mill, which plays the role of adjusting the roll gap of the upper and lower rolls. Keeping the roll gap / opening constant during the rolling process plays a vital role in the quality of rolled products. In actual use, the existing rolling mill pull rod device mainly has the following problems: [0003] 1 In the previous similar structure, the middle supporting elastic body structure was adopted, relying on the middle supporting elastic body to stretch and tension the upper and lower roller boxes, there were the following problems: with the wear of the new roller, the diameter of the roller became smaller and the elastic body was compressed The stroke beco...

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Problems solved by technology

[0003] 1 In the previous similar structure, the middle supporting elastic body structure was adopted, relying on the middle supporting elastic body to stretch and tension the upper and lower roller boxes, there were the following problems: with the wear of the new roller, the diameter of the roller became smaller and the elastic body was compressed The stroke becomes larger, and the elastic force increases nonlinearly. When the roll gap adjustment operation is performed, the load is too large, which often causes damage to the roll gap adjustment transmission device, or it is difficult to press down. Moreover, when the diameter span of the old and new rolls is large, This situation is more obvious and affects production efficiency to a large extent

[0004] 2 In the past, the "fixed part" and the "axial moving part" in the tie rod device were often locked by a single thread pair. Due to the inevitable fit gap between the single thread pairs, the roll could not be effectively locked, causing the roll to pass through the steel. Bouncing up and down in an instant often causes the roundness of the rolled product to fail to meet the requirements, affecting the quality of the rolled product

[0005] 3Each rolling mill is equipped with 4 supporting elastic bodies, the structure is complex, the volume is huge, and it is very inconvenient to install and replace

The supporting elastic body is often external and exposed outside. Due to the harsh environment of the workshop, the temperature of the rolling mill during the rolling process often reaches 700-800 degrees. Under the comprehensive influence of cooling water, iron oxide scale, dust, etc., the traditional The service life of the elastic body is affected, it is often replaced, and requires careful maintenance, which increases the production cost

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