Descaling device at inner wall of steel tube with 20-100mm of diameter

Abstract

The invention provides a descaling device at an inner wall of a steel tube with a 20-100mm of diameter. The descaling device comprises a three-way pipe and a high-pressure pipe, wherein the high-pressure pipe passes through two interfaces of the three-way pipe; the outlet end is connected with a flow equalizing head; high-pressure airflow or water flow and mortar are directly mixed inside an inner cavity of the steel tube to be descaled by matching of the high-pressure pipe and the three-way pipe; a high-speed abrasive jet is formed to strike the inner wall; and continuous, efficient and environment-friendly removal of a roll scale at the inner wall of the steel tube is achieved. Compared with the prior art, the descaling problem of the inner wall of the small-diameter steel tube of which the inner diameter is 20-100mm is successfully solved; the descaling device is high in descaling efficiency, free of pollution to the environment, and low in descaling cost; water or air and mortar are taken as materials; the water and the mortar can be recycled; a mixing nozzle of a common abrasive jet nozzle is concealed; and the descaling device is simple in structure, small in volume, easy to operate equipment, and wide in application range, and can be applied to various fields for cleaning the inner wall, such as descaling and derusting of the inner wall of the steel tube.

Description

technical field [0001] The invention relates to a device for descaling the inner wall of a small-diameter steel pipe with an inner diameter of 20-100mm. Background technique [0002] During hot rolling or heat treatment of steel pipes, a dense covering of metal oxides will be formed on the surface, commonly known as "scale". In the subsequent drawing and reaming process, it is easy to press the scales into the metal surface, causing surface quality problems. In addition, the hard scales will scratch the mandrel and accelerate the wear of the drawing machine or piercing machine. Based on this problem, the surface scales of the hot-rolled and heat-treated steel pipes must be thoroughly removed before entering the post-treatment process. [0003] At present, the surface descaling of steel pipes at home and abroad mostly adopts traditional pickling, shot blasting or shot blasting, and peeling. Because pickling will produce waste acid and acid mist, shot blasting or shot blasti...

AI Technical Summary

Problems solved by technology

Because pickling will produce waste acid and acid mist, shot peening or shot blasting, peeling treatment will produce a lot of dust, these methods have a great adverse impact on the surrounding environment and the health of production workers during the production process; as a new high-pressure Abrasive water jet descaling technology can solve environmental protection problems, but limited by the structure of the actuator and the internal space of the steel pipe, including shot blasting, shot blasting, peeling and general abrasive water jet, the scale on the inner wall of small diameter steel pipes with an inner diameter of φ100mm or less is basically can't handle

[0004] Through consulting patent documents, there are few domestic and foreign literatures on the acid-free descaling technology of the inner wall of steel pipes at room temperature, especially for the inner wall descaling of small-diameter steel pipes, and no good treatment technology and equipment have been proposed so far

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