Adjustable pull rod of core bar support frame

Abstract

The invention discloses an adjustable pull rod of a core bar support frame. The adjustable pull rod (1) is characterized by consisting of a first pull rod (2), a second pull rod (3), an adjusting nut (4) and a fixed bolt (5), wherein the first pull rod (2) is an integrated structure, one end is a pin shaft hole having a shaft sleeve, and the other end is a projected external thread; the second pull rod (3) is an integrated structure, one end is a pin shaft hole having a shaft sleeve, and the center of the other end is an internal thread; the adjusting nut (4) is an internal / external thread structure, is in fit connection with the external thread of the first pull rod (2) through the internal thread, is in fit connection with the internal thread of the second pull rod (3) through the external thread, and is positioned on the second pull rod (3) through the fixed bolt (5); internal and external threads of the adjusting nut (4) have the same rotating direction and different pitches; and when the adjusting nut (4) rotates by one lap, the length of the pull rod is changed by a pitch difference, so that the purpose of finely adjusting the length of the pull rod can be achieved, and the precise centering of three support rollers of the core bar support frame is realized.

Description

Technical field: [0001] The invention relates to the technical field of PQF-restricted mandrel continuous rolling, in particular to an adjustable pull rod for a mandrel supporting frame. Background technique: [0002] PQF limit mandrel continuous tube rolling technology is a tube rolling process technology developed in the mid-1990s. It has developed rapidly in the 21st century and represents the latest level of process design and manufacturing of today's seamless steel tube rolling mills. The mandrel support stand is the key equipment of the PQF continuous rolling mill. There are two mandrel support stands in the 5-stand PQF continuous rolling mill, which are used for the support and guidance of the mandrel. Before the capillary passes through and after rolling, the mandrel support rollers in the mandrel support frame are in the position of "holding" the mandrel to guide and center the mandrel; when the capillary is about to reach the support frame, the mandrel is The back...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an adjustable tie rod for a mandrel support frame, which mainly solves the poor alignment of the three support rollers in the frame caused by the non-adjustable pull rods of the existing mandrel support frame. Problems such as inability to effectively support and guide the mandrel

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