A kind of pqf continuous rolling mill connecting shaft and its roll changing method

Abstract

The invention discloses a method for connecting shafts and changing rolls of a PQF continuous rolling mill. The PQF continuous rolling mill connecting shaft of the present invention includes a roll end assembly and a tooth end assembly, and it also includes a shaft assembly. The left end of the shaft assembly is connected with the roll end assembly through a gear pair, and its right end is connected with the tooth end assembly through a fastener; The end assembly includes the inner ring gear at the roller end, the large connecting plate, the tensioning ring device, and the large mandrel; the shaft assembly includes the left top block, split gland, large external gear sleeve, spline sleeve, spline shaft, spacer sleeve, Locate the snap ring device, spring assembly, shaft end assembly, and right top block. The invention relates to a connecting shaft of a PQF continuous rolling mill, which can realize large-displacement expansion and contraction, and can realize rapid reset, thereby ensuring high production efficiency. At the same time, it can meet the requirements of on-site production of high-precision and high-quality seamless steel pipes.

Description

technical field [0001] The invention relates to a new connecting shaft of a PQF continuous rolling mill, which can be widely used for the connection between rolls and gear boxes at the production site of a three-roller structure continuous rolling pipe mill. Background technique [0002] Since its inception, the two-roll longitudinal rolling mill has developed rapidly. It has won people's favor for its high quality, high output and low consumption, and has become the mainstream of seamless steel pipe production. However, with the deepening of people's understanding of the two-roll pipe rolling process and production practice, it is found that there is a major problem in the two-roll continuous pipe rolling mill, that is, quality defects will occur due to uneven deformation of the metal during the rolling process, and With the increase of pass size, diameter-to-wall ratio and alloy ratio of rolled materials, the above problems have become more and more serious, and the growth...

AI Technical Summary

Problems solved by technology

At present, the disadvantages of the PQF rolling mill connecting shaft are: 1. When the roll is changed, the movement and reset of the shaft assembly on the connecting shaft is realized by the two-way screw, which is inefficient; 2. When the roll needs to be changed and shifted, the mandrel will be moved out of the spring , when it is reset, it is very difficult for the mandrel to re-enter the inner ring of the spring, the speed is extremely slow, and it will also shake; therefore, it is also impossible to achieve large displacement expansion and contraction; Tooth tip gap can not be eliminated well, which affects the quality of seamless steel pipe

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