A welding method for small-diameter pipes and an apparatus for implementing the method.

Abstract

This disclosure relates to a method for welding small-diameter pipes and an apparatus for implementing the method. The apparatus includes a long shaft and a handle ball, a liner and a grinding component, and a drive component. The grinding component includes a three-jaw chuck, a separator, a cup-shaped grinding wheel, a support body, a guide wheel assembly, and a first bearing. The drive component includes a frame, a locking bolt, a motor, a left retaining ring, a positioning bolt, a spring, a right retaining ring, and a second bearing. The length of the long shaft is greater than that of the pipe to be welded. The front of the long shaft is provided with a threaded section, a front rod section, a smooth rod section, and a shoulder for mounting the liner and the grinding component. The rear of the long shaft is provided with a threaded section, a rear rod section, and a shoulder for mounting the drive component. A handle ball is installed at the rear end of the long shaft to push the long shaft to move axially. The apparatus provided in this disclosure separates the grinding component and the drive component, connecting and driving them through a long shaft, enabling the liner welding and post-weld grinding to be completed in one operation.

Description

Technical Field

[0001] This disclosure relates to a method and apparatus for gasket welding of small-diameter pipes and for removing residual gaskets from the inner wall after welding. Background Technology

[0002] When welding small-diameter pipes, welding can only be performed on one side, which can easily lead to defects such as incomplete penetration or excessive weld beads on the inner wall of the pipe. These defects can affect the strength of the pipe and the flow pattern of high-speed fluids inside. Using backing technology in pipe welding is an effective way to avoid these weld defects.

[0003] Currently, there are already some pipe welding gasket devices, such as: a cross-sliding gasket device for pipe welding (CN109822286A), a gasket device for small-diameter pipe welding (CN219293174U), and an arc-shaped gasket device for pipe welding (CN107825059A).

[0004] These pipe welding gaskets use copper gaskets, which have low adhesion strength to steel pipes after welding and are easily removed. However, using copper gaskets under high welding temperatures can easily cause copper seepage into the inner wall of the steel pipe, affecting pipe performance.

[0005] Replacing the copper material of these gaskets with the same steel grade as the pipes can prevent copper seepage into the pipe walls. However, when welding steel gaskets, they will melt and become one with the pipe weld. After welding, the gaskets need to be removed and a special pipe wall grinding device needs to be installed to grind away any excess gasket residue.

[0006] Current pipe inner wall grinding devices include: pipe weld grinding machine (CN209304234U) and a pipe inner wall grinding device (CN115070527A). However, the driving and moving mechanisms of these pipe inner wall grinding devices are complex and combined with the grinding components, resulting in a large radial dimension of the device, making it difficult to install into small-diameter pipes.

[0007] Furthermore, the above-mentioned method requires two sets of equipment for pipe gasket welding and post-weld grinding, and the operation is cumbersome and the construction efficiency is low. Summary of the Invention

[0008] This disclosure proposes a welding method for small-diameter pipes and an apparatus for implementing the method, which can solve the problems mentioned in the background art, such as the need for two sets of equipment when selecting a gasket of the same steel grade as the pipe, and the difficulty in installing a grinding device into a small-diameter pipe. The grinding component and the driving component of this apparatus are separated. The grinding component is designed with a small radial dimension and placed inside the pipe. The driving component with a large radial dimension is arranged on the outside of the pipe end. The two are connected and driven by a long shaft, thereby enabling the gasket welding and post-weld grinding to be completed in one go.

[0009] The small-diameter pipe welding and grinding assembly described in this disclosure, Scheme 1: the assembly includes a gasket 3 and a grinding component, and its unique feature is:

[0010] The grinding components include a three-jaw holder 2, a separator cylinder 4, a cup-shaped grinding wheel 5, a support body 7, a guide wheel assembly 8, and a first bearing 9;

[0011] The three-claw frame is a structure formed by stamping a thin plate with square holes and three elastic claws. The outer side of the elastic claws is provided with grooves to hold and support the pad.

[0012] The gasket is made of the same steel grade as the pipe and is installed on the three-jaw bracket to seal the weld bevel of the pipe.

[0013] The outer diameter of the cup-shaped grinding wheel is smaller than the inner diameter of the pipe, and it is used to grind the gasket remaining on the inner wall of the pipe after welding. The cup-shaped grinding wheel is composed of a metal body and a grinding body. A square hole is machined in the center of the metal body and ventilation holes are machined around the circumference of the metal body. The grinding body is composed of resin-bonded abrasive.

[0014] The separator cylinder is machined with a square hole and is installed between the three-jaw holder and the bowl-shaped grinding wheel via a long shaft 10;

[0015] The support body is a cylindrical shape with thickened ends. The thickened section is machined with bearing holes for installing two first bearings 9. The outer wall of the middle section of the support body is machined with three planes evenly distributed around its circumference and threaded holes are machined therein, and three guide wheel sets 8 are installed by bolts.

[0016] The guide wheel assembly 8 consists of a wheel frame, two small wheels, and two wheel axles, and is used to support the back and forth movement of the liner and grinding components in the pipe.

[0017] Furthermore, the component also includes a fan 1;

[0018] The outer diameter of the fan is smaller than the inner diameter of the pipe, and a square hole is machined for the long shaft 10 to pass through; the two fans 1 are respectively installed in front of the three-jaw holder and after the bowl-shaped grinding wheel, and can generate axial flow under the drive of the long shaft 10 to cool the heat generated by grinding and blow the debris out of the pipe.

[0019] Furthermore, the gasket is annular with a boss on its outer edge; the size of the boss matches the welding bevel, with a height of 1-2mm and a width equal to the bevel spacing.

[0020] Furthermore, the component also includes a baffle 6; the baffle is disposed between the fan and the first bearing to prevent debris blown by the fan from splashing into the first bearing.

[0021] Option 2: Based on Option 1 and the optimized option, a driving component is added to the component to obtain Option 2, as follows:

[0022] The drive component includes a frame 12, a locking bolt 11, a motor 13, a left retaining ring 14, a positioning bolt 15, a spring 16, a right retaining ring 17, and a second bearing 18.

[0023] The frame consists of four parts: a clamping solid 1201, a motor base plate 1202, a connecting rod 1203, and a bearing base plate 1204. Three clamping solids are evenly distributed and welded to the left side of the motor base plate. The clamping solids have threaded holes, and the frame is secured to the outside of the right end of the pipe using three clamping bolts 11. A center hole and circumferential holes are machined on the motor base plate for mounting the motor. Three connecting rods are evenly distributed and welded to the right side of the motor base plate at their left ends, and welded to the bearing base plate at their right ends.

[0024] The bearing seat plate is machined with countersunk holes to install the second bearing;

[0025] The motor is mounted on the right side of the motor base plate; the motor is provided with a hollow square hole shaft for passing through the rear rod section of the long shaft 10;

[0026] The left retaining ring has a square hole for passing through the rear of the long shaft 10 and is fixed in position by the positioning bolt.

[0027] The second bearing is mounted on the bearing housing plate;

[0028] The right retaining ring is machined with a square hole for passing through the rear of the long shaft 10 and being installed in the hole of the second bearing;

[0029] The spring is a compression spring and is installed between the left retaining ring and the right retaining ring.

[0030] Using the components described in Scheme 2, along with the long shaft 10 and the handle ball 19, Scheme 3 is obtained, namely, a small-diameter pipe welding and grinding device:

[0031] The length of the long shaft is greater than the pipe to be welded;

[0032] The front part of the long shaft is provided with a threaded section, a front rod section, a smooth rod section and a shaft shoulder for mounting the liner and grinding components;

[0033] The rear of the long shaft is provided with a threaded section, a rear rod section and a shoulder in sequence for mounting the drive component;

[0034] The handle ball is installed at the rear end of the long shaft, which pushes the long shaft to move axially;

[0035] The three-jaw bracket is installed between the fan 1 and the partition cylinder 4 at the front of the long shaft;

[0036] The cup-shaped grinding wheel is installed at the front section of the long shaft;

[0037] The support is mounted to the front bare section of the shoulder of the long shaft via two first bearings 9.

[0038] Another aspect of this disclosure is to provide a small-diameter pipe welding method implemented by the device described in application scheme 3:

[0039] Follow these steps:

[0040] First, before welding, insert the gasket 3 and the grinding component into the pipe 20 to be welded; fix the drive component in the device to the outside of the end of the pipe 20 to be welded by the locking bolt 11;

[0041] The second step is to adjust the position of the long axis 10 so that the gasket 3 is aligned with the weld bevel 21 of the pipe 20 to be welded, so that the outer edge boss of the gasket 3 is clamped at the bevel 21.

[0042] The third step is to weld on the outside of the pipe 20 to be welded until the gasket 3 and the weld 22 are fused together.

[0043] Fourth step, push the long shaft 10 to drive the three-jaw chuck 2 to disengage from the pad 3 until the cup-shaped grinding wheel 5 hits the remaining part of the pad 3 on the weld 22; move the left retaining ring 14 to the right to compress the spring 16, the moving distance is 2-3 times the width of the weld 22, tighten the fixing bolt 15 to fix the left retaining ring 14 on the long shaft 10, and the spring 16 pushes the long shaft 10 to the left to load;

[0044] Fifth step, start motor 13 to drive long shaft 10 to rotate, drive cup-shaped grinding wheel 5 to grind the gasket residue on weld 22; at the same time, two fans 1 generate axial flow under the drive of long shaft 10 to cool the ground weld area and blow the grinding debris out of the pipe.

[0045] The above-described at least one technical solution adopted in one or more embodiments of this specification can achieve the following beneficial effects:

[0046] First, the device provided in this disclosure integrates gasket welding and post-weld grinding into one unit, requiring only one set of equipment to complete welding and grinding. It is simple to install and operate, and has high construction efficiency. Second, by applying the technical solution provided in this disclosure, the gasket can be made of the same steel grade as the pipe, eliminating the problem of copper seepage during welding. Third, the radial dimensions of the gasket and grinding components are small, making them suitable for installation in small-diameter pipes. In addition, the device is equipped with two axial flow fans, which can cool the grinding heat and blow the debris out of the pipe.

[0047] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0048] Other features and aspects of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0049] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the specification, serve to illustrate the technical solutions of this disclosure.

[0050] Figure 1 This is an overall sectional view of the device;

[0051] Figure 2 A partial cross-sectional view of the padding and polishing components mounted on the front of the long shaft;

[0052] Figure 3 A partial cross-sectional view of the drive component mounted at the rear of the long shaft;

[0053] Figure 4 A cross-sectional view of the gasket of the device;

[0054] Figure 5 This is a sectional front view of the three-jaw chuck of the device;

[0055] Figure 6 This is a left view of the three-jaw chuck of the device;

[0056] Figure 7 This is a cross-sectional view of the cup-shaped grinding wheel of the device.

[0057] Figure 8 A cross-sectional view of the fan in the device;

[0058] Figure 9 This is a cross-sectional view of the support body of the device;

[0059] Figure 10 A view of the guide wheel assembly of the device;

[0060] Figure 11A view of the long axis of the device;

[0061] Figure 12 This is a cross-sectional view of the frame of the device;

[0062] Figure 13 This is a cross-sectional view of the left retaining ring of the device;

[0063] Figure 14 This is a cross-sectional view of the right retaining ring of the device;

[0064] Figure 15 A cross-sectional view of the pipe with the device installed before welding;

[0065] Figure 16 This is a partial cross-sectional view of the gasket sealing the pipe bevel during the welding process;

[0066] Figure 17 A partial cross-sectional view of the gasket and grinding component after they have been welded and removed from the gasket;

[0067] Figure 18 A partial cross-sectional view of the gasket and the grinding component after the gasket has been ground off during welding.

[0068] In the diagram: 1-Fan; 2-Three-jaw holder; 3-Pad; 4-Divider cylinder; 5-Bowl-shaped grinding wheel; 501-Metal body; 502-Square hole; 503-Ventilation hole; 504-Grinding body; 6-Guide cover; 7-Support body; 701-Bearing hole; 702-Small plane; 703-Threaded hole; 8-Guide wheel assembly; 801-Wheel frame; 802-Small wheel; 803-Wheel axle; 9-First bearing; 10-Long shaft; 10 01-Front pole segment, 1002-Rear pole segment; 11-Securing bolt; 12-Frame; 1201-Securing object; 1202-Motor base plate; 1203-Connecting rod; 1204-Bearing base plate; 13-Motor; 14-Left retaining ring; 15-Positioning bolt; 16-Spring; 17-Right retaining ring; 18-Second bearing; 19-Handle ball; 20-Pipe to be welded; 21-Bevel; 22-Weld. Detailed Implementation

[0069] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0070] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0071] Furthermore, to better illustrate this disclosure, numerous specific details are set forth in the following detailed description. Those skilled in the art will understand that this disclosure can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art have not been described in detail in order to highlight the main points of this disclosure.

[0072] like Figures 1-14 The small-diameter pipe welding and grinding device disclosed herein consists of three parts: a long shaft and a handle ball, a liner and a grinding component, and a drive component.

[0073] The length of the long shaft is greater than that of the steel pipe to be welded; the front part of the long shaft is provided with a threaded section, a front rod section, a smooth rod section and a shoulder for installing the pad and grinding component; the rear part of the long shaft is provided with a threaded section, a rear rod section and a shoulder in sequence for installing the drive component; the rear end of the long shaft is provided with a handle ball to push the long shaft to move axially.

[0074] The pad and grinding components include: 2 fans, 1 three-jaw holder, 1 pad, 1 separator cylinder, 1 bowl-shaped grinding wheel, 1 baffle, 1 support body, 3 guide wheel assemblies, and 2 first bearings.

[0075] The outer diameter of the fan is slightly smaller than the inner diameter of the steel pipe, and a square hole is machined in it; the two fans are respectively installed in front of the three-jaw holder and behind the bowl-shaped grinding wheel at the front section of the long shaft, and generate axial airflow under the drive of the long shaft to cool the heat generated by grinding and blow the debris out of the pipe.

[0076] The three-jaw bracket is installed between the fan and the partition cylinder at the front of the long shaft; the three-jaw bracket is a structure formed by stamping a thin plate with a square hole and three elastic claws, and the outer side of the elastic claw is provided with a small groove to hold and support the pad.

[0077] The gasket is made of the same steel grade as the pipe and is installed on the three-jaw bracket to seal the pipe welding bevel. The gasket is designed in the shape of a ring with a small protrusion on the outer edge. The size of the small protrusion matches the welding bevel, with a height of 1-2mm and a width equal to the bevel spacing.

[0078] The outer diameter of the cup-shaped grinding wheel is slightly smaller than the inner diameter of the steel pipe. It is installed at the front section of the long shaft and is used to grind the gasket remaining on the inner wall of the pipe after welding. The cup-shaped grinding wheel is composed of a metal body and a grinding body. A square hole is machined in the center of the metal body and ventilation holes are machined around the circumference of the metal body. The grinding body is composed of resin-bonded abrasive.

[0079] The separator cylinder is machined with a square hole and installed between the three-jaw holder and the bowl-shaped grinding wheel at the front of the long shaft.

[0080] The baffle is positioned between the fan and the first bearing to prevent debris blown by the fan from splashing into the first bearing.

[0081] The support body is a cylindrical shape with thickened ends. The thickened section is machined with bearing holes and is installed on the front smooth section of the long shaft through two first bearings. The middle section of the support body has three small planes evenly distributed around its outer circumference and threaded holes, and three guide wheel assemblies are installed through bolts.

[0082] Each of the guide wheel assemblies consists of a wheel frame, two small wheels, and two wheel axles, supporting the back-and-forth movement of the liner and grinding components within the pipe.

[0083] The drive component includes: a frame, three locking bolts, a motor, a left retaining ring, a positioning bolt, a spring, a right retaining ring, and a second bearing.

[0084] The frame consists of four parts: a clamping body, a motor base plate, connecting rods, and a bearing base plate. Three clamping bodies are evenly distributed and welded to the left side of the motor base plate. The clamping bodies have threaded holes, and the frame is secured to the outside of the right end of the pipe using three clamping bolts. The motor base plate has a center hole and circumferential holes for mounting the motor. Three connecting rods are evenly distributed and welded to the right side of the motor base plate at their left ends, and welded to the bearing base plate at their right ends. The bearing base plate has countersunk holes for mounting the second bearing.

[0085] The motor is mounted on the right side of the motor base plate of the frame; the motor is provided with a hollow square hole shaft, which passes through the rear rod section of the long shaft.

[0086] The left retaining ring has a square hole that passes through the rear section of the long shaft and is fixed in position by the positioning bolt.

[0087] The second bearing is mounted on the bearing seat plate of the frame; the right retaining ring is machined with a square hole, passes through the rear rod section of the long shaft, and is installed in the hole of the second bearing.

[0088] The spring is a compression spring and is installed between the left retaining ring and the right retaining ring.

[0089] The following is an example of... Figures 15-18 The specific usage method of the device is introduced as follows:

[0090] First, before welding, insert the gasket and grinding component of the device into the pipe 20; fix the driving component to the outside of the end of the pipe 20 using the locking bolt 11; adjust the position of the long shaft 10 so that the gasket 3 is aligned with the bevel 21 to be welded on the pipe 20, wherein the small protrusion on the outer edge of the gasket 3 is clamped at the bevel 21, see [reference]. Figure 15 .

[0091] The second step involves welding the outside of the pipe 20, where the gasket 3 and the weld 22 are fused together. (See below) Figure 16 .

[0092] Thirdly, after welding is completed, push the long shaft 10 to move the three-jaw chuck 2 away from the pad 3 until the cup-shaped grinding wheel 5 hits the remaining part of the pad 3 in the weld 22; move the left retaining ring 14 to the right to compress the spring 16, the moving distance being 2-3 times the width of the weld 22; tighten the positioning bolt 15 to fix the left retaining ring 14 on the long shaft 10; the spring 16 pushes the long shaft 10 to the left to load it. See [link / reference]. Figure 17 .

[0093] Fourth step: Start the motor 13 to drive the long shaft 10 to rotate, which in turn drives the bowl-shaped grinding wheel 5 to grind the lining residue of the weld 22; simultaneously, the two fans 1 generate axial airflow under the drive of the long shaft 10 to cool the ground weld area and blow the grinding debris out of the pipe, see [link to relevant documentation] Figure 18 .

[0094] The embodiments described above are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A small-diameter pipe welding and grinding assembly, comprising a gasket (3) and a grinding component, characterized in that: The grinding components include a three-jaw holder (2), a separator cylinder (4), a cup-shaped grinding wheel (5), a support body (7), a guide wheel assembly (8), and a first bearing (9); The three-claw frame is a structure formed by stamping a thin plate with square holes and three elastic claws. The outer side of the elastic claws is provided with grooves to hold and support the pad. The gasket is made of the same steel grade as the pipe and is installed on the three-jaw bracket to seal the weld bevel of the pipe. The outer diameter of the cup-shaped grinding wheel is smaller than the inner diameter of the pipe, and it is used to grind the gasket remaining on the inner wall of the pipe after welding. The cup-shaped grinding wheel is composed of a metal body and a grinding body. A square hole is machined in the center of the metal body and ventilation holes are machined around the circumference of the metal body. The grinding body is composed of resin-bonded abrasive. The separator cylinder is machined with a square hole and is installed between the three-jaw holder and the bowl-shaped grinding wheel via a long shaft (10); The support body is a cylindrical shape with thickened ends. The thickened section is machined with bearing holes for installing two first bearings (9). The outer wall of the middle section of the support body is machined with three planes evenly distributed around its circumference and threaded holes are machined to install three guide wheel sets (8) by bolts. The guide wheel assembly (8) consists of a wheel frame, two small wheels and two wheel axles, and is used to support the back and forth movement of the liner and grinding components in the pipe.

2. The small-diameter pipe welding and grinding assembly according to claim 1, characterized in that: The component also includes a fan (1); The outer diameter of the fan is smaller than the inner diameter of the pipe, and a square hole is machined for the long shaft (10) to pass through; the two fans (1) are respectively installed in front of the three-jaw holder and behind the bowl-shaped grinding wheel, and can generate axial flow under the drive of the long shaft (10) to cool the heat generated by grinding and blow the debris out of the pipe.

3. The small-diameter pipe welding and grinding assembly according to claim 2, characterized in that: The pad is annular with a boss on the outer edge; the size of the boss matches the welding bevel, with a height of 1-2mm and a width equal to the bevel spacing.

4. The small-diameter pipe welding and grinding assembly according to claim 3, characterized in that: The component also includes a shield (6); The baffle is positioned between the fan and the first bearing to prevent debris blown by the fan from splashing into the first bearing.

5. The small-diameter pipe welding and grinding assembly according to claim 4, characterized in that: The component also includes a driving component; The drive component includes a frame (12), a locking bolt (11), a motor (13), a left retaining ring (14), a positioning bolt (15), a spring (16), a right retaining ring (17), and a second bearing (18); The frame consists of four parts: a clamping solid (1201), a motor base plate (1202), a connecting rod (1203), and a bearing base plate (1204). There are three clamping solids, which are evenly distributed and welded to the left side of the motor base plate. The clamping solids are machined with threaded holes, and the frame is clamped and fixed to the outside of the right end of the pipe by three clamping bolts (11). The motor base plate is machined with a center hole and a circumferential hole for mounting the motor. There are three connecting rods, which are evenly distributed and welded to the right side of the motor base plate at the left end, and welded to the bearing base plate at the right end. The bearing seat plate is machined with countersunk holes to install the second bearing; The motor is installed on the right side of the motor base plate; the motor is provided with a hollow square hole shaft for passing through the rear rod section of the long shaft (10); The left retaining ring has a square hole for passing through the rear of the long shaft (10) and is fixed in position by the positioning bolt. The second bearing is mounted on the bearing housing plate; The right retaining ring is machined with a square hole for passing through the rear of the long shaft (10) and being installed in the hole of the second bearing; The spring is a compression spring and is installed between the left retaining ring and the right retaining ring.

6. A small-diameter pipe welding and grinding device, characterized in that, The components described in claim 5 are used, along with the long shaft (10) and the handle ball (19); The length of the long shaft is greater than the pipe to be welded; The front part of the long shaft is provided with a threaded section, a front rod section, a smooth rod section and a shaft shoulder for mounting the liner and grinding components; The rear of the long shaft is provided with a threaded section, a rear rod section and a shoulder in sequence for mounting the drive component; The handle ball is installed at the rear end of the long shaft, which pushes the long shaft to move axially; The three-jaw bracket is mounted between the fan (1) and the partition cylinder (4) at the front of the long shaft; The cup-shaped grinding wheel is installed at the front section of the long shaft; The support is mounted to the front bare section of the shoulder of the long shaft via two first bearings (9).

7. A welding method for small-diameter pipes, characterized in that... The apparatus of claim 6 is used in accordance with the following steps: First, before welding, insert the gasket (3) and the grinding component into the pipe (20) to be welded; fix the drive component in the device to the outside of the end of the pipe (20) to be welded by the locking bolt (11); The second step is to adjust the position of the long axis (10) so that the gasket (3) is aligned with the weld bevel (21) of the pipe (20) to be welded, so that the outer edge boss of the gasket (3) is clamped at the bevel (21). The third step is to weld on the outside of the pipe (20) to be welded until the gasket (3) and the weld (22) are fused together. Fourth step, push the long shaft (10) to drive the three-jaw chuck (2) to disengage from the pad (3) until the cup-shaped grinding wheel (5) hits the remaining part of the pad (3) on the weld (22); move the left retaining ring (14) to the right to compress the spring (16), the moving distance is 2-3 times the width of the weld (22), tighten the fixing bolt (15) to fix the left retaining ring (14) on the long shaft (10), and the spring (16) pushes the long shaft (10) to the left to load; Fifth step, start the motor (13) to drive the long shaft (10) to rotate, and drive the cup-shaped grinding wheel (5) to grind the gasket residue on the weld (22); at the same time, the two fans (1) generate axial flow under the drive of the long shaft (10), cool the ground part of the weld and blow the grinding debris out of the pipe.

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