A tool for polishing the inside of a pipe

Abstract

This utility model discloses a grinding tool for the inner wall of a circular tube, belonging to the technical field of grinding tools. It includes a fixing device, a grinding device, and a driving device. The fixing device is located at both ends of the circular tube. The grinding device includes a grinding rod with an external thread at one end and several grinding seats connected to the other end of the grinding rod along the circumferential direction via a connecting rod. Sandpaper or scouring pads are placed on the grinding seats, and the outer surface of the grinding seats abuts against the inner wall of the circular tube. The driving device drives the grinding rod to move back and forth to grind the inner wall of the circular tube. It includes a driving frame, one end of which is connected to the fixing device via several feet. A threaded hole is located at the center of the driving frame, and the grinding rod is threaded into the threaded hole. This utility model utilizes a grinding mechanism to drive the grinding rod to rotate. When the grinding rod rotates, it moves synchronously along the axial direction of the circular tube under the action of the threaded hole at the center of the driving frame, achieving uniform grinding of the inner wall of the circular tube and ensuring consistent grinding results.

Description

Technical Field

[0001] This utility model belongs to the field of polishing tool technology, and specifically relates to a polishing tool for the inner wall of a round tube. Background Technology

[0002] In the industrial manufacturing sector, circular tubes, as key connection and conveying devices, are widely used in various industries such as petrochemicals, high-voltage power, and water conservancy. The quality of their inner walls directly determines the core performance and service life of the products. Among these factors, the surface roughness of the inner wall of a circular tube has a significant impact on conveying efficiency, media purity, and corrosion resistance. Taking high-voltage power pipes as an example, their inner walls must meet the standard of "absolute smoothness." If there are uneven marks or dents, they can easily cause point discharge accidents under high-voltage environments, threatening the safe operation of the power system.

[0003] However, the current mainstream manual polishing methods in the industry have insurmountable drawbacks: for round pipes with small diameters or long lengths, workers' arms or conventional tools cannot reach the middle section of the pipe, creating obvious blind spots for polishing. In the petrochemical industry, there have been numerous incidents where crude oil and chemical raw materials have been contaminated due to incomplete rust and scale removal from the inner walls of the middle section of the pipeline, resulting in not only economic losses but also increased subsequent treatment costs. Furthermore, manual polishing relies on the operator's experience, making it difficult to control the polishing force and uniformity, easily leading to localized over-polishing or incomplete polishing, further affecting the quality stability of the inner wall of the round pipe.

[0004] With the increasing demands for precision in the industrial sector, traditional manual grinding methods can no longer meet the needs of efficient and high-quality production. Developing a grinding tool for the inner wall of round tubes that can eliminate grinding blind spots and ensure grinding uniformity has become an urgent need for the current industry development. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a grinding tool for the inner wall of a round tube, so as to solve the problems of difficulty in grinding the middle section of a small-diameter or long round tube and poor consistency of manual grinding.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A tool for grinding the inner wall of a round tube, comprising: Fixing devices, located at both ends of the circular tube, are used to support the circular tube; A grinding device for grinding the inner wall of a round tube includes a grinding rod. One end of the grinding rod has an external thread and an internal hexagonal groove. The other end of the grinding rod is connected to several grinding seats along the circumferential direction via a connecting rod. Sandpaper or scouring pads are provided on the grinding seats. The outer surface of the grinding seats abuts against the inner wall of the round tube. A drive device is used to drive the grinding rod to move back and forth to grind the inner wall of the round tube. It includes a drive frame, one end of which is connected to a fixing device through several feet. A threaded hole is provided at the center of the drive frame, and the grinding rod is threaded into the threaded hole.

[0007] Furthermore, the fixing device includes a fixing frame, with a plurality of fixing clamps arrayed on the inner wall of the fixing frame. A movable clamp is provided on one side of each fixing clamp. Both the fixing clamp and the movable clamp are provided with an arc-shaped straight groove in the middle. A top post is provided inside the arc-shaped straight groove, and a slot is provided in the middle of the top post. A pin is also provided on the top post. An inner ring is provided between the fixing clamp and the movable clamp with a gap. The inner ring is located inside the slot of the top post. An arc-shaped guide groove is provided on the inner ring, and the pin passes through the arc-shaped guide groove. A plurality of gear teeth are provided on the outer ring of the inner ring, and a worm gear that meshes with the gear teeth is rotatably connected to the fixing frame.

[0008] Furthermore, a rubber pad is provided at one end of the top column near the circular tube.

[0009] Furthermore, the fixed frame is provided with a base at its lower part, and the bottom of the base is flat.

[0010] Furthermore, the side wall of the grinding base is provided with a snap groove, and a snap plate is detachably connected in the snap groove. The sandpaper or scouring pad is placed in the snap groove on both sides and fixed to the grinding base by the snap plate.

[0011] Furthermore, the drive frame is equipped with several blow pipes, the air inlets of which are connected to an air compressor, and the air outlets of which are aligned with the inner wall of the circular tube to blow away the rust stains that have been ground off inside the circular tube; the airflow blown out by the multiple blow pipes enters the interior of the circular tube in a spiral manner.

[0012] Furthermore, multiple connecting rods are arranged in parallel, with one end of each connecting rod hinged to a grinding rod and the other end hinged to a grinding seat. The grinding rod is equipped with an adjustment device for adjusting the distance between the grinding seat and the grinding rod. The adjustment device includes a sliding sleeve slidably fitted onto the outside of the grinding rod, with several push rods hinged to the sliding sleeve. One end of each push rod is hinged to the middle of one of the connecting rods. An adjusting nut is threaded onto the grinding rod, and the adjusting nut abuts against the sliding sleeve.

[0013] Furthermore, a spring is fitted around the outside of the grinding rod, with one end of the spring abutting against the sliding sleeve and the other end of the spring abutting against the adjusting nut. After the grinding device is installed inside the round tube, the spring is in a compressed state.

[0014] Furthermore, it also includes a support frame for supporting the end of the grinding rod. The support frame includes a support plate, and the end of the grinding rod is rotatably mounted on the support plate via a bearing. Both ends of the support plate are provided with threaded sleeves, and the threaded sleeves are internally threaded with support legs. The bottom of the support legs is provided with casters.

[0015] The beneficial effects of this utility model are: (1) This utility model utilizes a grinding mechanism to drive the grinding rod to rotate. When the grinding rod rotates, it moves synchronously along the axial direction of the round tube under the action of the central threaded hole of the drive frame, thereby achieving uniform grinding of the inner wall of the round tube and ensuring the consistency of the grinding effect.

[0016] (2) During the clamping process of the round tube, the multiple top columns move synchronously, which realizes the centering and clamping of the round tube on the fixed device, ensuring that the grinding rod and the central axis of the round tube are collinear, and ensuring the uniformity of the grinding force of the grinding device on the inner wall of the round tube.

[0017] (3) By setting a base with a planar structure at the bottom of the fixed frame, the stability of the fixing device when placed on the ground is ensured.

[0018] (4) A groove is provided on the side wall of the grinding seat, and a detachable clip is provided in the groove. The two sides of the sandpaper or scouring pad are clamped in the groove by the clip, which makes it easy to replace the sandpaper or scouring pad after it is worn.

[0019] (5) By setting a blowpipe on the drive frame, the air outlet of the blowpipe is aligned with the inner wall of the round pipe, which facilitates the real-time blowing of the rust stains that have been ground inside the round pipe. Furthermore, the airflow blown out by multiple blowpipes enters the interior of the round pipe in a spiral state, which further enhances the blowing effect of the blowpipe.

[0020] (6) By setting an adjustment device, the position of the sliding sleeve on the grinding rod is adjusted by rotating the adjusting nut, and the connecting rod is pushed by the push rod to rotate, thereby driving the grinding seat to move closer to or away from the grinding rod, so as to realize the adjustment of the position of the grinding seat.

[0021] (7) By setting a spring, a constant preload is generated on the sliding sleeve, so that the grinding seat generates stable pressure on the inner wall of the round tube. By tightening or loosening the adjusting nut, it is easy to adjust the grinding force of the grinding device on the inner wall of the round tube.

[0022] (8) By setting a support frame to support the end of the grinding rod, the grinding rod can maintain a stable axial position during the rotation grinding process, reducing the shaking and offset caused by rotation and improving the stability of the grinding device during grinding. Attached Figure Description

[0023] Figure 1 This is a diagram showing the usage of a tool for grinding the inner wall of a round tube according to this utility model.

[0024] Figure 2 This is a schematic diagram of the fixing device.

[0025] Figure 3 This is a schematic diagram of the fixing frame in the fixing device.

[0026] Figure 4This is a schematic diagram of the assembly of the grinding device, drive device and support frame.

[0027] Figure 5 This is a schematic diagram of the grinding device.

[0028] Figure 6 This is a schematic diagram of the grinding base structure.

[0029] In the diagram, 1. Fixing device; 11. Fixing frame; 111. Base; 12. Fixing clamp; 121. Arc-shaped straight groove; 13. Movable clamp; 14. Inner ring; 141. Gear tooth; 142. Arc-shaped guide groove; 15. Worm gear; 16. Top column; 161. Pin shaft; 162. Rubber pad; 2. Drive device; 21. Drive frame; 22. Foot; 23. Blow pipe; 3. Grinding device; 31. Grinding rod; 32. Grinding seat; 321. Snap groove; 322. Snap plate; 33. Connecting rod; 34. Top rod; 35. Sliding sleeve; 36. Spring; 37. Adjusting nut; 4. Support frame; 41. Support plate; 42. Screw sleeve; 43. Support leg; 44. Caster. Detailed Implementation

[0030] The following will be combined with the appendix Figures 1-6 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] like Figure 1 As shown, a grinding tool for the inner wall of a round tube includes a fixing device 1, a grinding device 3, and a driving device 2. The fixing device 1 is disposed at both ends of the round tube and is used to support the round tube; as shown... Figure 4 As shown, the grinding device 3 is used to grind the inner wall of the round tube. It includes a grinding rod 31. One end of the grinding rod 31 is provided with an external thread and its end is provided with an internal hexagonal groove. The other end of the grinding rod 31 is connected to a plurality of grinding seats 32 along the circumferential direction via a connecting rod 33. Sandpaper or scouring pad is provided on the grinding seats 32. The outer surface of the grinding seats 32 abuts against the inner wall of the round tube. like Figure 4 As shown, the driving device 2 is used to drive the grinding rod 31 to move back and forth to grind the inner wall of the round tube. It includes a driving frame 21. One end of the driving frame 21 is connected to the fixing device 1 through several feet 22. The center of the driving frame 21 is provided with a threaded hole that matches the grinding rod 31. The grinding rod 31 is threaded through the threaded hole. When the grinding rod 31 rotates, it can move axially along the threaded hole to achieve grinding.

[0033] When grinding the inner wall of a round tube, the fixing device 1 is installed at both ends of the round tube. After connecting the grinding device 3 and the driving device 2 into a whole, the driving device 2 is connected to the fixing device 1 on one side, so that the sandpaper or scouring pad is pressed against the inner wall of the round tube. The driving mechanism such as an electric drill is connected to the internal hexagonal groove of the end of the grinding rod 31 with external thread. The driving mechanism such as the electric drill is started to rotate forward or reverse, which drives the grinding rod 31 to rotate forward or reverse. When the grinding rod 31 rotates, it moves synchronously under the action of the central threaded hole of the driving frame 21, so as to achieve uniform grinding of the inner wall of the round tube and ensure the consistency of the grinding effect.

[0034] like Figure 3 As shown, the fixing device 1 includes a fixing frame 11, and a plurality of fixing plates 12 are arrayed and connected to the inner wall of the fixing frame 11. A movable plate 13 is provided on one side of each fixing plate 12. Both the fixing plate 12 and the movable plate 13 are provided with an arc-shaped straight groove 121 in the middle. A top post 16 is provided inside the arc-shaped straight groove 121. A slot is provided in the middle of the top post 16. A pin 161 is also provided on the top post 16. Figure 2 As shown, an inner ring 14 is provided between the fixed clamping plate 12 and the movable clamping plate 13 with a gap. The inner ring 14 is located inside the slot of the top column 16. The inner ring 14 is provided with an arc-shaped guide groove 142, and the pin 161 passes through the arc-shaped guide groove 142. The outer ring of the inner ring 14 is provided with a plurality of gear teeth 141, and a worm gear 15 that meshes with the gear teeth 141 is rotatably connected to the fixed frame 11.

[0035] Using the aforementioned fixing device 1, when the fixing device 1 performs the fixing operation on the round tube, the rotating worm gear 15 drives the inner ring 14 to rotate. When the inner ring 14 rotates, the arc-shaped guide groove 142 and the arc-shaped straight groove 121 drive the top column 16 to move radially along the inner ring 14. Multiple top columns 16 clamp the round tube to complete the fixing of the round tube. In addition, during the clamping process, multiple top columns 16 move synchronously, realizing the centering clamping of the round tube on the fixing device 1, ensuring that the grinding rod 31 is collinear with the central axis of the round tube, and ensuring the uniformity of the grinding force of the grinding device 3 on the inner wall of the round tube.

[0036] like Figure 2 As shown, a rubber pad 162 is provided at one end of the top post 16 near the round tube to prevent the top post 16 from damaging the outer wall of the round tube.

[0037] like Figure 2 , Figure 3 As shown, the lower part of the fixing frame 11 is provided with a base 111, and the bottom of the base 111 is flat, which ensures the stability of the fixing device 1.

[0038] like Figure 6 As shown, the side wall of the grinding base 32 is provided with a buckle groove 321, and a buckle plate 322 is detachably connected in the buckle groove 321. The two sides of the sandpaper or scouring pad are placed in the buckle groove 321 and fixed to the grinding base 32 by the buckle plate 322, which facilitates the replacement of the sandpaper or scouring pad after wear.

[0039] like Figure 4 As shown, the drive frame 21 is provided with a plurality of blow pipes 23. The air inlet of the blow pipe 23 is connected to the air compressor, and the air outlet of the blow pipe 23 is aligned with the inner wall of the round pipe to blow away the rust stains that have been ground off inside the round pipe. In some embodiments, the airflow blown out by the plurality of blow pipes 23 enters the interior of the round pipe in a spiral state, which further enhances the blowing effect of the blow pipes 23.

[0040] like Figure 5 As shown, multiple connecting rods 33 are arranged in parallel, with one end of each connecting rod 33 hinged to a grinding rod 31 and the other end of each connecting rod 33 hinged to a grinding seat 32. An adjustment device is provided on the grinding rod 31 to adjust the distance between the grinding seat 32 and the grinding rod 31 to accommodate round tubes of different inner diameters. The adjustment device includes a sliding sleeve 35 slidably fitted onto the outside of the grinding rod 31. Several push rods 34 are hinged to the sliding sleeve 35, with one end of each push rod 34 hinged to the middle of one of the connecting rods 33. An adjusting nut 37 is threaded onto the grinding rod 31, and the adjusting nut 37 abuts against the sliding sleeve 35.

[0041] By rotating the adjusting nut 37, the position of the sliding sleeve 35 on the grinding rod 31 is adjusted. When the sliding sleeve 35 moves along the axial direction of the grinding rod 31, the push rod 34 pushes and pulls the connecting rod 33 to rotate around the hinge point at the lower end of the connecting rod 33, thereby driving the grinding seat 32 to move closer to or further away from the grinding rod 31, thus realizing the adjustment of the position of the grinding seat 32.

[0042] like Figure 5 As shown, a spring 36 is sleeved on the outside of the grinding rod 31. One end of the spring 36 abuts against the sliding sleeve 35, and the other end of the spring 36 abuts against the adjusting nut 37. After the grinding device 3 is installed inside the round tube, the spring 36 is in a compressed state. The compressed spring 36 generates a constant preload on the sliding sleeve 35, so that the grinding seat 32 generates stable pressure on the inner wall of the round tube. By tightening or loosening the adjusting nut 37, the grinding force of the grinding device 3 on the inner wall of the round tube can be easily adjusted.

[0043] like Figure 4As shown, it also includes a support frame 4 for supporting the end of the grinding rod 31. The support frame 4 includes a support plate 41. The end of the grinding rod 31 is rotatably mounted on the support plate 41 via a bearing. Both ends of the support plate 41 are provided with threaded sleeves 42. The threaded sleeves 42 are internally threaded with support legs 43. The bottom of the support legs 43 is provided with casters 44.

[0044] The end of the grinding rod 31 is rotatably mounted on the support plate 41 via a bearing, which enables the grinding rod 31 to maintain a stable axial position during the rotational grinding process, reducing the shaking and offset caused by rotation and improving the stability of the grinding device 3 during grinding.

[0045] The above content is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the structure of the utility model, they should all fall within the protection scope of this utility model.

Claims

1. A tool for grinding the inner wall of a round tube, comprising: Fixing device (1) is provided at both ends of the circular tube to support the circular tube; A grinding device (3) is used to grind the inner wall of a round tube. It is characterized by including a grinding rod (31), one end of which is provided with an external thread and an internal hexagonal groove. The other end of the grinding rod (31) is connected to a plurality of grinding seats (32) along the circumferential direction via a connecting rod (33). Sandpaper or scouring pad is provided on the grinding seats (32), and the outer surface of the grinding seats (32) abuts against the inner wall of the round tube. The driving device (2) is used to drive the grinding rod (31) to move back and forth to grind the inner wall of the round tube. It includes a driving frame (21). One end of the driving frame (21) is connected to the fixing device (1) through several feet (22). The center of the driving frame (21) is provided with a threaded hole, and the grinding rod (31) is threadedly connected in the threaded hole.

2. The grinding tool for the inner wall of a round tube according to claim 1, characterized in that, The fixing device (1) includes a fixing frame (11), and a plurality of fixing plates (12) are arrayed and connected to the inner wall of the fixing frame (11). A movable plate (13) is provided on one side of the fixing plate (12). Both the fixing plate (12) and the movable plate (13) are provided with an arc-shaped straight groove (121) in the middle. A top post (16) is provided inside the arc-shaped straight groove (121). A slot is provided in the middle of the top post (16). A pin (161) is also provided on the top post (16). An inner ring (14) is provided between the fixed clamping plate (12) and the movable clamping plate (13). The inner ring (14) is located inside the slot of the top column (16). The inner ring (14) is provided with an arc-shaped guide groove (142). The pin (161) passes through the arc-shaped guide groove (142). The outer ring of the inner ring (14) is provided with several gear teeth (141). A worm (15) that meshes with the gear teeth (141) is rotatably connected to the fixed frame (11).

3. A pipe internal wall polishing tool according to claim 2, wherein The top column (16) is provided with a rubber pad (162) at one end near the round tube.

4. A pipe internal wall polishing tool according to claim 2, wherein The fixed frame (11) is provided with a base (111) at the bottom, and the bottom of the base (111) is flat.

5. A pipe internal wall polishing tool according to claim 1, wherein The grinding seat (32) has a groove (321) on its side wall. A snap plate (322) is detachably connected in the groove (321). Sandpaper or scouring pad is placed in the groove (321) and fixed to the grinding seat (32) by the snap plate (322).

6. A pipe internal wall polishing tool according to claim 1, wherein The drive frame (21) is provided with several blow pipes (23). The air inlet of the blow pipe (23) is connected to the air compressor, and the air outlet of the blow pipe (23) is aligned with the inner wall of the round pipe to blow away the rust stains that have been polished inside the round pipe. The airflow blown out by the multiple blow pipes (23) enters the inside of the round pipe in a spiral state.

7. A pipe internal wall polishing tool according to claim 1, wherein Multiple connecting rods (33) are arranged in parallel, with one end of the connecting rod (33) hinged to the grinding rod (31) and the other end of the connecting rod (33) hinged to the grinding seat (32). The grinding rod (31) is provided with an adjustment device for adjusting the distance between the grinding seat (32) and the grinding rod (31). The adjustment device includes a sliding sleeve (35) that is slidably sleeved on the outside of the grinding rod (31). Several push rods (34) are hinged on the sliding sleeve (35), with one end of the push rod (34) hinged to the middle of one of the connecting rods (33). An adjusting nut (37) is threaded onto the grinding rod (31), and the adjusting nut (37) abuts against the sliding sleeve (35).

8. A pipe internal wall polishing tool according to claim 7, wherein The grinding rod (31) is fitted with a spring (36) on the outside. One end of the spring (36) abuts against the sliding sleeve (35), and the other end of the spring (36) abuts against the adjusting nut (37). After the grinding device (3) is installed inside the round tube, the spring (36) is in a compressed state.

9. A pipe internal wall polishing tool according to any one of claims 1 to 8, wherein It also includes a support frame (4) for supporting the end of the grinding rod (31). The support frame (4) includes a support plate (41). The end of the grinding rod (31) is rotatably mounted on the support plate (41) by a bearing. The two ends of the support plate (41) are provided with threaded sleeves (42). The threaded sleeves (42) are internally threaded with support legs (43). The bottom of the support legs (43) is provided with casters (44).

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