Three-roller tube-rolling machine

Abstract

A three-roller tube mill relates to hot-rolled seamless steel tube equipment. The existing three-roller tube mill is a small-sized tube mill which is provided with a closed frame, changes a roll in an off-line manner, and can only produce seamless tubes with the diameter shorter than 219mm. The three-roller tube mill comprises three rotating drums and three rollers which are arranged in the frame, and main motors which are connected with the rollers by main speed reducers and main transmission shafts. The fame is an open frame consisting of an upper part and a lower part and provided with three cylinders which form an angle of 120 degrees with each other; the three rollers and the three rotating drums are respectively arranged in the three cylinders; and the three rollers are respectively connected with the three main motors and the main speed reducers by the transmission shafts. The three-roller tube mill has the advantages that the fame has good rigidity and high strength; the transmission device does not easily resonate and has good stability; the tube mill body is provided with an inlet auxiliary device and an outlet auxiliary device; the roller shape can satisfy metal flowability very well, thus causing the production of large-diameter steel tubes possible.

Description

technical field [0001] The invention relates to equipment for hot-rolling seamless steel pipes, in particular to a cross-rolling three-roller pipe mill. Background technique [0002] Existing cross-rolling three-roll pipe mill is composed of main parts such as frame, drum, roll and transmission device. The frame is composed of upper and lower parts. There are three windows with an angle of 120° to each other on the frame. The roll drums are respectively installed in the three windows, and the rolls are respectively connected with the transmission device. [0003] CN1981948A discloses a kind of " three-roll pipe rolling mill ", and it is closed frame, off-line (equipment is lifted from production line outside) the small-scale pipe rolling mill that changes roll, can only produce the seamless steel tube below 219 diameters. This three-roll pipe mill has the following disadvantages: [0004] 1. It must use two tube rolling mills to be replaced as a whole to complete the produ...

AI Technical Summary

Problems solved by technology

[0003] CN1981948A discloses a "three-roll pipe rolling mill", which is a small-sized pipe rolling mill with a closed frame and off-line (suspension of the equipment to the outside of the production line) to replace the rolls, and can only produce seamless steel pipes with a diameter of 219 or less

[0004] 1. It must use two tube rolling machines to be replaced as a whole to complete the production. Every time it is replaced, the power line, hydraulic pipeline, glycerin lubrication pipeline, and water cooling pipeline installed on it must be disassembled, and all parts need to be loosened. A variety of connecting bolts, time-consuming and labor-intensive

The closed stand is inconvenient to repair and change rolls, and it takes a long time, so it is necessary to move the rolling mill from the production line to another place for maintenance, and another rolling mill needs to be installed on the production line to take over production, resulting in a one-time failure for the user. Sexual investment costs increase

[0005] 2. In order to reduce the disassembly and assembly time, it has to use the quick connector of the pipeline and the quick socket of the power supply, but this will cause many problems such as unreliable connection

The rolling angle is fixed and cannot be adjusted, and the adjustment of the feeding angle can only be changed without mechanical reprocessing, which will result in the uniformity of the rolled products

[0007] 4. It is very difficult to overhaul and assemble the closed frame. Its three spaces for installing rolls at 120° to each other are window-type, resulting in poor rigidity of the frame.

[0008] 5. Its main drive is a motor that separates three shafts through a reducer to drive three rolls. The reducer just blocks the exit of the rolling mill. It is necessary to make a hole in the reducer so that the pipe can pass through. This not only restricts The production range of the steel pipe is reduced, and the high temperature of the pipe reduces the performance of the reducer

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