Cutting device for semicircular notch of pipe body

Abstract

The invention discloses a cutting device for a semicircular notch of a pipe body, which is characterized in that two cutting torches (26) are symmetrically arranged on the outer side of the pipe body (23), a horizontal output shaft of a speed reducer drives the pipe body to rotate, a vertical output shaft of the speed reducer drives the cutting torches to axially move, the combined track of the movement of the two is semicircular, the rotating speed of the pipe body is controlled by a speed regulating mechanism, the speed regulating mechanism comprises a friction wheel (29) moving vertically, the displacement of the friction wheel changes along with the rotation angle of the pipe body, the two sides of the friction wheel are tightly attached to a driving disc (30) and a driven disc (28) respectively, the driving disc is connected with a main shaft of a motor (31), and the driven disc is connected with an input shaft (36) of the speed reducer; in the rotating process of the pipe body, the speed regulating mechanism can enable the rotating speed of the input shaft (36) of the speed reducer to change along with the rotating angle of the pipe body, the rotating speed of the input shaft (36) is reduced when the friction wheel moves upwards, and vice versa; and the speed is regulated through the speed regulating mechanism, so that the cutting speed is basically consistent, and the notch shape after cutting is closer to a semicircle.

Description

technical field [0001] The invention relates to a cutting device for a semicircular notch of a pipe body. Background technique [0002] During the manufacture and installation of pressure vessels, pipe fittings are often connected. For pipe fittings with larger diameters, in order to ensure the connection strength between the main pipe and the branch pipe, it is necessary to process a notch at the end of the branch pipe that matches the outer diameter of the main pipe. (intersecting lines). The patent No. 2011201762979 discloses a saddle mouth cutting machine for pipe fittings. A gas cutting torch is used to cut the saddle mouth at the end of the pipe fittings. This forms a saddle mouth on the pipe fitting; the patent application number 2020104274720 discloses a flame cutting device for the pipe body, which uses a flame gun to cut a semicircular notch at the end of the pipe fitting. The torch (flame gun) moves back and forth along the axis of the pipe, and the moving posit...

AI Technical Summary

Problems solved by technology

[0003] The movement trajectory of the cutting torch (flame gun) on the pipe body is the synthesis of the rotational movement of the pipe and the axial reciprocation movement of the cutting torch. The speed of each point of the synthesis movement is inconsistent, that is, the cutting speed is inconsistent. The cutting speed at the mouth of the notch is the fastest, and the cutting speed at the bottom of the notch is the slowest. The ratio of the speed difference between the two is as high as 40%. The edge of the cutting seam is uneven, and even local melting occurs, making it difficult to clean the slag after cutting

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