Small caliber short tube chamfering machine

Abstract

The utility model relates to a small caliber short pipe chamfering machine. It solves the technical problems of low efficiency of present manual polishing and unable to realize batch processing. Including frame body, the frame body lower end inside is equipped with drive motor, the frame body upper end inside is equipped with burr grinding tool assembly, burr grinding tool assembly is linked with drive motor through grinding tool drive structure, burr grinding tool assembly has the outer ring grinding tool that rotates to set up in the frame body upper end inside and is used for with short pipe end outside contact, the one side of outer ring grinding tool is equipped with the inner ring grinding drill that rotates to set up in the frame body upper end inside and is used for with short pipe end inside contact, and outer ring grinding tool and inner ring grinding drill are located on same horizontal plane. Advantages lie in: adopting double tool collaborative design, equipping outer ring grinding tool with inner ring grinding drill simultaneously, and both are located on same horizontal plane, can carry out grinding burr to the outside and the inside of short pipe end part, greatly promote processing efficiency, especially suitable for batch production scene.

Description

Technical Field

[0001] This utility model belongs to the technical field of chamfering machine equipment, specifically relating to a small-diameter short pipe chamfering machine. Background Technology

[0002] After short pipes are cut using laser cutting or pipe cutters, a large number of burrs often remain at the ends. In the early days, manual grinding was used, requiring workers to repeatedly grind the ends of the short pipes with sandpaper and other tools. This method was not only inefficient and costly in terms of manpower and time, but also difficult to ensure consistent grinding quality for each short pipe due to variations in manual operation. The efficiency and quality issues were particularly prominent when processing batches of short pipes. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a small-diameter short pipe chamfering machine.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a small-diameter short pipe chamfering machine, comprising a frame, a drive motor provided on the inner side of the lower end of the frame, and a burr grinding tool assembly provided on the inner side of the upper end of the frame. The burr grinding tool assembly is connected to the drive motor through a grinding tool drive structure. The burr grinding tool assembly has an outer ring grinding tool rotatably disposed on the inner side of the upper end of the frame and used to contact the outer side of the end of the short pipe. An inner ring grinding drill bit is provided on one side of the outer ring grinding tool, rotatably disposed on the inner side of the upper end of the frame and used to contact the inner side of the end of the short pipe. The outer ring grinding tool and the inner ring grinding drill bit are located on the same horizontal plane.

[0005] In the aforementioned small-diameter short pipe chamfering machine, the outer ring grinding tool has an outer ring grinding section with an inverted conical structure at one end. This outer ring grinding section is welded from multiple high-speed steel blades. The inner side of the outer ring grinding section has a grinding cavity with several grinding notches circumferentially arranged, and these notches contact the outer circumferential side of the short pipe end. The inverted conical structure of the outer ring grinding section allows for a good fit to the outer edge of the pipe end, enabling precise grinding. The grinding cavity provides space for the pipe end, avoiding interference. The circumferential grinding notches form an effective cutting edge and also facilitate chip removal, preventing chip blockage that could affect processing quality and tool life. The high-speed steel blades provide high hardness and wear resistance, and the welded structure is simple to manufacture and has a low cost.

[0006] In the aforementioned small-diameter short pipe chamfering machine, one end of the inner ring grinding drill bit has a conical inner ring grinding section. The outer circumferential side of the inner ring grinding section has several grinding protrusions, which contact the inner circumferential side of the short pipe end. The conical structure of the inner ring grinding section allows it to naturally enter the pipe bore and grind the edge of the bore. The grinding protrusions are the actual cutting points. This structural design ensures effective removal of burrs from the inner bore while reducing the contact area with the pipe wall, thus lowering friction and resistance.

[0007] In the aforementioned small-diameter short pipe chamfering machine, the tool grinding drive structure includes a double pulley mounted on the output shaft of a drive motor. The double pulleys are respectively equipped with an outer belt connected to the outer grinding tool and an inner belt connected to the inner grinding drill bit. Both the outer grinding tool and the inner grinding drill bit are equipped with tool grinding drive assemblies. The transmission is reasonable and the layout is compact. A single drive motor drives the tool and drill bit separately via the double pulleys. The structure is simple and the cost is low. Simultaneously, the belt drive provides a certain degree of buffering and overload protection, mitigating the impact of motor startup on the tool.

[0008] In the aforementioned small-diameter short pipe chamfering machine, the tool grinding drive assembly includes an outer ring drive unit located at the end of the outer ring tool grinding assembly away from the short pipe. One end of the outer ring drive unit extends axially above the output shaft, and the end of the outer ring drive unit away from the short pipe is connected to an outer ring belt. An inner ring drive unit is located at the end of the inner ring drill bit grinding assembly away from the short pipe. One end of the inner ring drive unit extends axially above the output shaft, and the end of the inner ring drive unit away from the short pipe is connected to an inner ring belt. Power transmission is direct and effective. The axial extension of the drive unit above the output shaft makes the belt drive layout more reasonable, the power flow transmission path smoother, reduces unnecessary torque loss, and ensures that the tool and drill bit receive sufficient cutting power.

[0009] In the aforementioned small-diameter short pipe chamfering machine, a horizontal motor support is provided on the inner side of the lower end of the frame, and the drive motor is connected to the horizontal motor support. A horizontal drill bit support is provided on the inner side of the upper end of the frame, and the deburring tool assembly is connected to the horizontal drill bit support. This provides stable support and ensures precision, offering a robust and accurate mounting reference for the deburring tool assembly and guaranteeing the concentricity and positional accuracy of the outer ring grinding tool and the inner ring grinding drill bit under high-speed rotation.

[0010] In the aforementioned small-diameter short pipe chamfering machine, a motor controller is provided on one side adjacent to the burr grinding tool assembly. A control button base is connected above the motor controller, and the motor controller is connected to the drive motor.

[0011] In the aforementioned small-diameter short pipe chamfering machine, a horizontally arranged protective plate is provided on the upper part of the frame near the burr-sharpening tool assembly. Both ends of the protective plate are respectively provided with downwardly angled side guards, and the protective plate and side guards are integrally formed and made of transparent material. This provides physical protection without obstructing the operator's view, allowing for real-time observation of the processing process and timely detection of problems. It effectively blocks potentially flying chips during processing, ensuring operator safety and maintaining a clean working environment.

[0012] In the aforementioned small-diameter short pipe chamfering machine, the frame body has several positioning posts on the side near the burr-grinding tool assembly, each corresponding to an outer ring grinding tool and an inner ring grinding drill bit. These positioning posts are connected to the frame body via several connecting rods. The upper end of each positioning post has a short pipe fixing seat movably mounted, coaxially with the centers of the outer and inner ring grinding sections. The upper side of the short pipe fixing seat has a V-shaped short rod placement groove. A baffle is located at the end of the short rod placement groove away from the burr-grinding tool assembly, and the short pipe is placed within the short rod placement groove, with the short pipe's length exceeding the groove's length. The V-shaped short rod placement groove, combined with the baffle, enables rapid placement and axial positioning of the short pipe, eliminating the need for complex clamps and tightening operations. This also achieves semi-automatic processing, reducing manual operation. The positioning posts ensure alignment between the fixing seat and the tool, guaranteeing stable processing quality.

[0013] In the aforementioned small-diameter short pipe chamfering machine, the lower side of the short pipe fixing seat is provided with a guide moving part fixed to the upper end of the positioning column. The upper side of the guide moving part is provided with a sliding groove, and the short pipe fixing seat is disposed within the sliding groove. Under external force, the short pipe fixing seat moves axially along the direction of the burr-grinding tool assembly. The short pipe fixing seat can move axially within the sliding groove. The operator only needs to place the short pipe into the V-groove and push it towards the tool. Using the short pipe itself as a medium, the manual pushing force is converted into a uniform feed motion. This self-guided feeding method has a simple and reliable structure, eliminates the need for a complex power feeding mechanism, reduces costs, and can adapt to short pipes of different lengths, as long as they are longer than the V-groove.

[0014] Compared with existing technologies, the advantages of this utility model are: 1. This device adopts a dual-tool collaborative design. The equipment is equipped with an outer ring grinding tool and an inner ring grinding drill bit, and the two are located on the same horizontal plane. It can grind burrs on the outer and inner sides of the short pipe end, saving time and greatly improving processing efficiency, which is especially suitable for mass production scenarios.

[0015] 2. The outer ring grinding section of the device adopts an inverted conical structure and a circumferential grinding notch design. The grinding notch can precisely fit with the circumferential outer side of the short pipe end, which can evenly remove burrs on the outer side of the short pipe and avoid local over-grinding or omission.

[0016] 3. The inner ring grinding section of the device adopts a conical structure and a circumferential grinding protrusion design. The conical structure facilitates insertion into the inside of the short tube, and the grinding protrusion can perform comprehensive grinding on the circumferential side of the inside of the short tube.

[0017] 4. This device, through a drive motor and a double pulley power structure, can simultaneously provide power to the outer ring shaving tool and the inner ring shaving drill bit, eliminating the need for multiple additional drive devices. Furthermore, both the outer and inner ring drive units extend axially above the output shaft, shortening the belt drive path, reducing power loss, ensuring synchronous high-speed rotation of the two tools, and further improving shaving efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a structural schematic diagram from another perspective of the present invention.

[0020] Figure 3 This is a structural cross-sectional view of the present invention.

[0021] Figure 4 This is a structural schematic diagram of the short tube fixing seat in this utility model.

[0022] In the diagram: Frame 1, Drive motor 11, Output shaft 12, Motor transverse support 13, Drill bit transverse support 14, Motor controller 15, Control button seat 16, Deburring and grinding tool assembly 2, Outer ring grinding tool 21, Inner ring grinding drill bit 22, Outer ring grinding part 23, Grinding cavity 24, Grinding notch 25, Inner ring grinding part 26, Grinding protrusion 27, Grinding tool drive structure 3, Double pulley 31, Outer ring belt 32, Inner ring belt 33, Grinding tool drive assembly 4, Outer ring drive part 41, Inner ring drive part 42, Protective plate 5, Side guard plate 51, Positioning post 6, Connecting rod 61, Short pipe fixing seat 62, Short rod placement slot 63, Baffle 64, Guide moving part 65, Sliding groove 66. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1-4As shown, a small-diameter short pipe chamfering machine includes a frame 1. A drive motor 11 is provided on the inner side of the lower end of the frame 1, and a burr grinding tool assembly 2 is provided on the inner side of the upper end of the frame 1. The burr grinding tool assembly 2 is connected to the drive motor 11 through a grinding tool drive structure 3. The burr grinding tool assembly 2 has an outer ring grinding tool 21 that is rotatably disposed on the inner side of the upper end of the frame 1 and is used to contact the outer side of the end of the short pipe. An inner ring grinding drill bit 22 is provided on one side of the outer ring grinding tool 21 that is rotatably disposed on the inner side of the upper end of the frame 1 and is used to contact the inner side of the end of the short pipe. The outer ring grinding tool 21 and the inner ring grinding drill bit 22 are located on the same horizontal plane.

[0025] Combination Figure 1 and Figure 3 As shown, the outer ring grinding tool 21 has an outer ring grinding section 23 with an inverted conical structure at one end. The outer ring grinding section 23 is welded from multiple high-speed steel blades. The inner side of the outer ring grinding section 23 has a grinding cavity 24. The grinding cavity 24 has several grinding notches 25 circumferentially provided, and the grinding notches 25 are in contact with the outer circumferential side of the short pipe end. The outer ring grinding section 23 adopts an inverted conical structure. This shape can fit well with the outer edge of the pipe end for precise grinding. The grinding cavity 24 provides a space for the pipe end to accommodate it and avoids interference. The circumferential grinding notches 25 form an effective cutting edge and are also conducive to chip removal, preventing chip blockage from affecting the machining quality and tool life. It is made of high-speed steel blades with high hardness and good wear resistance. The welded structure is simple to manufacture and has a low cost.

[0026] The inner grinding drill bit 22 has a tapered inner grinding section 26 at one end. The inner grinding section 26 has several grinding protrusions 27 arranged circumferentially outwards, and these protrusions 27 contact the inner circumferential side of the short pipe end. The tapered structure of the inner grinding section 26 allows it to naturally enter the pipe bore and grind the edge of the bore. The grinding protrusions 27 are the actual cutting points. This structural design ensures effective removal of burrs from the inner bore while reducing the contact area with the pipe wall, thus lowering friction and resistance.

[0027] Combination Figure 2 and Figure 3 As shown, the tool sharpening drive structure 3 includes a double pulley 31 mounted on the output shaft 12 of the drive motor 11. The double pulley 31 is respectively equipped with an outer belt 32 connected to the outer grinding tool 21 and an inner belt 33 connected to the inner grinding drill bit 22. Both the outer grinding tool 21 and the inner grinding drill bit 22 are equipped with a tool sharpening drive assembly 4. The transmission is reasonable and the layout is compact. A single drive motor 11 drives the tool and drill bit respectively through the double pulleys 31. The structure is simple and the cost is low. At the same time, the belt drive has a certain buffering and overload protection function, which can reduce the impact of the motor startup on the tool.

[0028] The tool regrinding drive assembly 4 includes an outer ring drive section 41 located at the end of the outer ring regrinding tool 21 away from the short tube. One end of the outer ring drive section 41 extends axially above the output shaft 12, and the end of the outer ring drive section 41 away from the short tube is connected to the outer ring belt 32. An inner ring drive section 42 is located at the end of the inner ring regrinding drill bit 22 away from the short tube. One end of the inner ring drive section 42 extends axially above the output shaft 12, and the end of the inner ring drive section 42 away from the short tube is connected to the inner ring belt 33. Power transmission is direct and effective. The axial extension of the drive section above the output shaft 12 makes the belt drive layout more reasonable, the power flow transmission path smooth, reduces unnecessary torque loss, and ensures that the tool and drill bit receive sufficient cutting power.

[0029] A motor transverse support 13 is provided on the inner side of the lower end of the frame 1, and the drive motor 11 is connected to the motor transverse support 13. A drill bit transverse support 14 is provided on the inner side of the upper end of the frame 1, and the burr grinding tool assembly 2 is connected to the drill bit transverse support 14. The support is stable and the precision is guaranteed, providing a solid and accurate installation reference for the burr grinding tool assembly 2, ensuring the concentricity and positional accuracy of the outer ring grinding tool 21 and the inner ring grinding drill bit 22 under high-speed rotation. In addition, bearings matching the outer ring grinding tool 21 and the inner ring grinding drill bit 22 are respectively installed in the drill bit transverse support 14.

[0030] like Figure 1 As shown, a motor controller 15 is provided on one side of the burr grinding tool assembly 2. A control button base 16 is connected above the motor controller 15, and the motor controller 15 is connected to the drive motor 11.

[0031] Combination Figure 1 and Figure 3 As shown, a horizontally arranged protective plate 5 is provided on the upper part of the frame 1 near the burr-sharpening tool assembly 2. At both ends of the protective plate 5 are inclined downward-facing side guards 51, and the protective plate 5 and the side guards 51 are integrated and made of transparent material. While providing physical protection, it does not obstruct the operator's view, allowing real-time observation of the processing process, facilitating timely detection of problems, effectively blocking potentially flying chips during processing, ensuring operator safety, and maintaining a clean working environment.

[0032] Combination Figure 1 and Figure 4As shown, the frame 1 has several positioning posts 6 on the side near the burr-grinding tool assembly 2, corresponding one-to-one with the outer ring grinding tool 21 and the inner ring grinding drill bit 22. The positioning posts 6 are connected to the frame 1 through several connecting rods 61. The upper end of the positioning posts 6 is movably provided with short tube fixing seats 62, which are coaxially arranged with the center of the outer ring grinding part 23 and the center of the inner ring grinding part 26, respectively. The upper side of the short tube fixing seat 62 is provided with a V-shaped short rod placement groove 63. The end of the short rod placement groove 63 away from the burr-grinding tool assembly 2 is provided with a baffle 64, and the short tube is placed in the short rod placement groove 63 with a length greater than the length of the short rod placement groove 63. The V-shaped short rod placement groove 63, together with the baffle 64, can realize the rapid placement and axial positioning of the short tube, eliminating the need for complex clamping and tightening operations, and also realizing semi-automated processing, reducing manual operation. The positioning posts 6 ensure that the fixing seat and the tool are aligned, ensuring the stability of the processing quality.

[0033] The short pipe fixing seat 62 has a guide moving part 65 fixed to the upper end of the positioning post 6 on its lower side. The guide moving part 65 has a sliding groove 66 on its upper side. The short pipe fixing seat 62 is set in the sliding groove 66, and the short pipe fixing seat 62 moves axially along the direction of the burr grinding tool assembly 2 under the action of external force. The short pipe fixing seat 62 can move axially in the sliding groove 66. The operator only needs to put the short pipe into the V-shaped groove and push it towards the tool. Using the short pipe itself as a medium, the manual pushing force is converted into a uniform feed motion. This self-guided feed method has a simple and reliable structure, does not require a complex power feed mechanism, reduces costs, and can adapt to short pipes of different lengths, as long as they are longer than the V-shaped groove.

[0034] The principle of this embodiment is as follows: The drive motor 11 starts, and its output shaft 12 drives the double pulley 31 to rotate. The double pulley 31 transmits power to the outer grinding tool 21 and the inner grinding drill bit 22 through the outer belt 32 and the inner belt 33, respectively. The outer drive part 41 of the outer grinding tool 21 and the inner drive part 42 of the inner grinding drill bit 22 are connected to the outer belt 32 and the inner belt 33, respectively, thereby realizing the rotational movement of the outer grinding tool 21 and the inner grinding drill bit 22. The short tube is placed in the short rod placement groove 63 of the short tube fixing seat 62, and one end of the short tube abuts against the baffle 64 to achieve circumferential positioning of the short tube. The short tube fixing seat 62 can move axially along the direction of the burr grinding tool assembly 2 under the action of external force in the sliding groove 66 of the guide moving part 65, so that the end of the short tube... Approach and align the burr-refining tool assembly 2; the outer ring refining part 23 of the outer ring refining tool 21 contacts the outer side of the short pipe end, and the circumferential refining notch 25 of the refining cavity 24 contacts the circumferential outer side of the short pipe end. As the outer ring refining tool 21 rotates, the burrs on the outer side of the short pipe end are refining. After the outer side of the short pipe end is refining, the short pipe is placed in another short pipe fixing seat 62. Then, the inner ring refining part 26 of the inner ring refining drill bit 22 is inserted into the inner side of the short pipe end, and the circumferential outer refining protrusion 27 contacts the circumferential inner side of the short pipe end. When the inner ring refining drill bit 22 rotates, the refining protrusion 27 refining the burrs on the inner side of the short pipe end is refining, thereby realizing the refining of the inner and outer sides of the short pipe end.

[0035] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0036] Although this document frequently uses terms such as frame 1, drive motor 11, output shaft 12, motor transverse support 13, drill bit transverse support 14, motor controller 15, control button seat 16, burr-refining tool assembly 2, outer ring burr-refining tool 21, inner ring burr-refining drill bit 22, outer ring burr-refining part 23, burr-refining cavity 24, burr-refining notch 25, inner ring burr-refining part 26, burr-refining protrusion 27, burr-refining tool drive structure 3, double pulley 31, outer ring belt 32, inner ring belt 33, burr-refining tool drive assembly 4, outer ring drive part 41, inner ring drive part 42, protective plate 5, side guard plate 51, positioning post 6, connecting rod 61, short pipe fixing seat 62, short rod placement slot 63, baffle 64, guide moving part 65, and sliding groove 66, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A small-diameter short pipe chamfering machine, comprising a frame (1), wherein a drive motor (11) is provided on the inner side of the lower end of the frame (1), characterized in that, The frame (1) is provided with a burr grinding tool assembly (2) on the inner side of the upper end. The burr grinding tool assembly (2) is connected to the drive motor (11) through the grinding tool drive structure (3). The burr grinding tool assembly (2) has an outer ring grinding tool (21) that is rotatably disposed on the inner side of the upper end of the frame (1) and is used to contact the outer side of the end of the short pipe. The outer ring grinding tool (21) is provided with an inner ring grinding drill bit (22) that is rotatably disposed on the inner side of the upper end of the frame (1) and is used to contact the inner side of the end of the short pipe. The outer ring grinding tool (21) and the inner ring grinding drill bit (22) are located on the same horizontal plane.

2. The small-diameter short pipe chamfering machine according to claim 1, characterized in that, The outer ring grinding tool (21) has an outer ring grinding part (23) with an inverted conical structure at one end. The outer ring grinding part (23) is welded from multiple stainless steel blades. The inner side of the outer ring grinding part (23) has a grinding cavity (24). The grinding cavity (24) is provided with several grinding notches (25) in the circumferential direction, and the grinding notches (25) are in contact with the outer circumferential direction of the end of the short pipe.

3. A small-diameter short pipe chamfering machine according to claim 2, characterized in that, The inner ring grinding drill bit (22) has a tapered inner ring grinding part (26) at one end. The inner ring grinding part (26) has several grinding protrusions (27) on its outer circumferential side, and the grinding protrusions (27) are in contact with the inner circumferential side of the end of the short pipe.

4. A small-diameter short pipe chamfering machine according to claim 1, 2, or 3, characterized in that, The tool regrinding drive structure (3) includes a double pulley (31) on the output shaft (12) of the drive motor (11). The double pulley (31) is provided with an outer belt (32) connected to the outer regrinding tool (21) and an inner belt (33) connected to the inner regrinding drill bit (22). The outer regrinding tool (21) and the inner regrinding drill bit (22) are provided with a tool regrinding drive assembly (4).

5. A small-diameter short pipe chamfering machine according to claim 4, characterized in that, The tool regrinding drive assembly (4) includes an outer ring drive part (41) disposed at the end of the outer ring regrinding tool (21) away from the short tube. One end of the outer ring drive part (41) extends axially above the output shaft (12). The end of the outer ring drive part (41) away from the short tube is connected to the outer ring belt (32). The inner ring regrinding drill bit (22) is an inner ring drive part (42) at the end of the inner ring away from the short tube. One end of the inner ring drive part (42) extends axially above the output shaft (12), and the end of the inner ring drive part (42) away from the short tube is connected to the inner ring belt (33).

6. A small-diameter short pipe chamfering machine according to claim 1, characterized in that, The frame (1) is provided with a motor transverse support (13) on the inner side of the lower end. The drive motor (11) is connected to the motor transverse support (13). The frame (1) is provided with a drill bit transverse support (14) on the inner side of the upper end. The burr grinding tool assembly (2) is connected to the drill bit transverse support (14).

7. A small-diameter short pipe chamfering machine according to claim 1, characterized in that, The burr-refining tool assembly (2) is provided with a motor controller (15) on one side adjacent to it. A control button base (16) is connected above the motor controller (15), and the motor controller (15) is connected to the drive motor (11).

8. A small-diameter short pipe chamfering machine according to claim 1, characterized in that, The frame (1) has a horizontally arranged protective plate (5) on the upper end of the side near the burr-refining tool assembly (2). The protective plate (5) has side guards (51) arranged at both ends, and the protective plate (5) and the side guards (51) are integrated and made of transparent material.

9. A small-diameter short pipe chamfering machine according to claim 3, characterized in that, The frame (1) is provided with a number of positioning posts (6) on the side near the burr grinding tool assembly (2), which correspond one-to-one with the outer ring grinding tool (21) and the inner ring grinding drill bit (22). The positioning posts (6) are connected to the frame (1) through a number of connecting rods (61). The upper end of the positioning posts (6) is provided with short tube fixing seats (62) that are coaxially arranged with the center of the outer ring grinding part (23) and the center of the inner ring grinding part (26). The upper side of the short tube fixing seat (62) is provided with a short rod placement groove (63) with a V-shaped structure. The end of the short rod placement groove (63) away from the burr grinding tool assembly (2) is provided with a baffle (64), and the short tube is placed in the short rod placement groove (63) and the length of the short tube is greater than the length of the short rod placement groove (63).

10. A small-diameter short pipe chamfering machine according to claim 9, characterized in that, The short pipe fixing seat (62) is provided with a guide moving part (65) fixed to the upper end of the positioning column (6) on the lower side. The guide moving part (65) is provided with a sliding groove (66) on the upper side. The short pipe fixing seat (62) is located in the sliding groove (66), and the short pipe fixing seat (62) moves axially along the direction of the burr grinding tool assembly (2) under the action of external force.

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