Guide wheel special for shot blasting of inner wall of pipeline

Abstract

The invention discloses a guide wheel special for shot blasting of the inner wall of a pipeline, the guide wheel is a helical bevel gear and comprises a wheel body and a supporting rod, the wheel body is a cone, a plurality of tooth grooves are distributed on the conical surface of the wheel body, the tooth grooves incline relative to the generatrix of the cone, and the inclination degree of the tooth grooves is expressed by a helical angle beta; the inner wall of the wheel body is rotationally connected with a supporting rod through a plane bearing, and the end, away from the conical bottom, of the supporting rod is connected with the shot blasting gun head. When the surface of the wheel body is impacted by peening shots, the tooth grooves are inclined relative to the conical generatrix, high-speed peening shots impact the tooth groove surfaces to drive the wheel body to rotate, the peening shots and the surface of the wheel body generate rolling friction, the rolling friction force is far smaller than sliding friction force, the surface abrasion of the guide wheel is greatly reduced, the service life is greatly prolonged, and the maintenance and replacement cost is greatly reduced. Once an impact pit is formed, the impact pit can be replaced in advance, so that the whole-course production quality is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline surface treatment, and in particular relates to a special guide wheel for shot peening of the inner wall of a pipeline. Background Art

[0002] In recent years, the continuous development of industries such as nuclear power, petrochemicals, and natural gas has brought opportunities for the development of the pipeline industry, and the quality requirements for the required steel pipes are becoming increasingly higher. The previous method of cleaning the inner wall of steel pipes by grinding wheels and other methods can no longer meet the production and internal surface quality requirements.

[0003] Recently, sandblasting / shot blasting machines have emerged to clean the inner walls of steel pipes. These machines spray high-speed projectiles onto the inner surface of the steel pipe, continuously rotating it while cleaning it. This removes scale, welding slag, sand, dirt, and other surface deposits, revealing the metal's true color. This creates a uniform surface roughness and improves corrosion resistance. However, because the nozzle can only be fixed in one direction, efficiency is low.

[0004] CN203357271U once disclosed a shot blasting gun for a steel pipe inner wall shot blasting cleaning machine, comprising a gun body and a gun head, wherein the central axis of the gun head is in the same straight line with the central axis of the gun body; the gun head outlet end is provided with a multi-directional conical guide block that matches the inner wall of the steel pipe, and its cone bottom is located on the side away from the gun head outlet end, so that the sand ejected by the shot blaster flies out in a conical surface, covering the entire circumference of the inner wall of the steel pipe, greatly shortening the production cycle and improving production efficiency. However, in practice, the conical guide block made of carbon steel quickly produces impact pits under the scouring of high-speed shot blasting, and is quickly penetrated and fails. Its service life is only a few tens of minutes on average. Even if high-wear-resistant tungsten carbide (WC) hard alloy is used, it will completely fail in about 6 hours. The maintenance and replacement cost is high. The impact pits also cause the inner wall oxide scale to be not cleanly removed, and the saponification and phosphating effects are poor, which brings more quality problems to the final steel pipe cold drawing work. Summary of the Invention

[0005] The object of the present invention is to provide a guide wheel specially used for shot blasting the inner wall of a pipeline, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a guide wheel specially used for shot peening the inner wall of a pipe, wherein the guide wheel is a helical bevel gear, comprising a wheel body and a support rod, wherein the wheel body is a cone, and a plurality of tooth grooves are distributed on its conical surface, and the tooth grooves are inclined relative to the cone generatrix, and the degree of inclination is represented by the helix angle β; the inner wall of the wheel body is rotatably connected to the support rod through a plane bearing, and the end of the support rod away from the bottom of the cone is connected to the head of the shot peening gun.

[0007] According to a further technical solution, a washer and two nuts are sleeved on the other end of the support rod close to the conical bottom to limit the wheel body and the plane bearing for easy disassembly and replacement.

[0008] According to a further technical solution, the helix angle β is 30°.

[0009] According to a further technical solution, the wheel body is made of tungsten carbide (WC).

[0010] The beneficial effects of the present invention are as follows: a guide wheel specifically designed for shot peening the inner wall of a pipe utilizes a helical bevel gear design. The wheel surface is impacted by the shot peening. Because the tooth grooves are tilted relative to the cone generatrix, the high-speed shot peening impacts the tooth groove surface, driving the wheel body to rotate. This generates rolling friction between the shot and the wheel surface. Because the rolling friction coefficient is much smaller than the sliding friction coefficient, and the rolling friction force is much smaller than the sliding friction force, wheel surface wear is greatly reduced, significantly extending the service life and significantly reducing maintenance and replacement costs. Once an impact crater is formed, the wheel can be replaced early, thereby ensuring overall production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic axial cross-sectional view of a guide wheel specifically designed for shot peening the inner wall of a steel pipe according to the present invention;

[0012] Figure 2 The figure is a schematic diagram of the three-dimensional structure of a guide wheel specially used for shot peening the inner wall of a steel pipe according to the present invention.

[0013] Among them, 1-wheel body, 2-tooth groove, 3-support rod, 4-plane bearing, 5-nut, 6-gasket. DETAILED DESCRIPTION

[0014] The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0015] like Figure 1 、 Figure 2 As shown, the present invention is a guide wheel specially used for shot peening the inner wall of a pipe, including a wheel body 1 and a support rod 3. The wheel body 1 is a cone, and a plurality of tooth grooves 2 are distributed on its conical surface. The tooth grooves 2 are inclined relative to the cone generatrix, and the degree of inclination is represented by the helix angle β; the inner wall of the wheel body 1 is rotatably connected to the support rod 3 through a plane bearing 4, and the end of the support rod 3 away from the bottom of the cone is connected to the head of the shot peening gun.

[0016] Preferably, a washer 6 and two nuts 5 are sleeved on the other end of the support rod 3 close to the conical bottom.

[0017] Preferably, the helix angle β is 30°.

[0018] Preferably, the wheel body 1 is made of tungsten carbide (WC).

[0019] It should be noted that helical bevel gears are bevel gears whose tooth profiles on the crown wheel are straight lines that do not pass through the top of the cone. There are two types of bevel gears: orthogonal helical bevel gears and spiral bevel gears. Orthogonal helical bevel gears have an inclined straight line tooth profile, while spiral bevel gears have an arc tooth profile. They are also called circular arc bevel gears, spiral bevel gears, spiral bevel gears, etc.

[0020] During operation, the operator installs the guide wheel for pipe inner wall shot blasting on the head of the shot blasting gun, inserts it into the steel pipe, and moves it axially at a constant speed. The high-pressure sand stream impacts the wheel, driving it to rotate at high speed. The sand particles are centrifugally scattered and completely cover the inner wall of the steel pipe. The average service life of the tungsten carbide (WC) wheel reaches 160 hours, 26 times that of the original.

[0021] The above shows and describes the main features and advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative rather than restrictive. Without departing from the spirit of the design of the present invention, various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A special guide wheel for shot blasting the inner wall of a pipe, characterized in that: The guide wheel is a helical bevel gear, including a wheel body and a support rod. The wheel body is a cone with a plurality of tooth grooves distributed on its conical surface. The tooth grooves are inclined relative to the cone generatrix, and the degree of inclination is represented by the helix angle β. The inner wall of the wheel body is rotatably connected to the support rod through a plane bearing, and the end of the support rod away from the bottom of the cone is connected to the head of the shot peening gun.

2. The guide wheel for shot blasting the inner wall of a pipe according to claim 1, characterized in that: A washer and two nuts are sleeved on the other end of the support rod close to the conical bottom.

3. The guide wheel for shot blasting the inner wall of a pipe according to claim 1, characterized in that: The helix angle β is 30°.

4. The guide wheel for shot blasting the inner wall of a pipe according to claim 1, characterized in that: The wheel body is made of tungsten carbide (WC).

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