Grinding device for inner cavity of metal arc-shaped pipe

Abstract

The invention belongs to the technical field of pipeline inner cavity polishing, and discloses a metal arc-shaped pipe inner cavity polishing device which comprises a pipeline, a first annular sleeve plate is installed on one side of the outer wall of the pipeline, a second annular sleeve plate is installed at the end, close to the first annular sleeve plate, of the pipeline, and compression grooves are formed in the three sides of the outer wall of the first annular sleeve plate. And first limiting grooves are formed in the two sides of the interior of the compression groove in one side. According to the pipeline polishing device, when the pipeline is moved forwards and encounters an arc-shaped bend, a first guide rod drives a first hinge base to slide in a compression groove through downward pressing of a roller, meanwhile, a first spring is squeezed, the effect is that the roller always abuts against the inner wall of the pipeline so that a polishing head can be stabilized, and therefore the situation that the pipeline is damaged due to long-time hand holding of the pipeline can be prevented; and the situation that a worker shakes when holding the pipeline by hand is caused, the grinding head may deviate, the inner cavity of the pipeline is ground unevenly, and meanwhile potential safety hazards caused by holding the pipeline by hand can be avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline inner cavity grinding, in particular to a metal arc-shaped pipe inner cavity grinding device. Background Art

[0002] The inner cavity grinding device of metal arc pipe is a mechanical device specially used for grinding and processing the inner surface of metal pipes, especially curved pipes. Its main function is to clean the inner cavity of metal pipes, remove oxide layers and impurities, or perform surface smoothing to ensure that the inner wall of the pipe reaches a certain smoothness and precision requirements.

[0003] In the common metal arc tube inner cavity grinding device, a person needs to hold the grinder with one hand and hold the pipeline connected to the grinding head with the other hand to control the angle of the grinding head. The operation is cumbersome, and when the pipeline connected to the grinding head is held by hand, it will inevitably cause the grinding head to be unstable and thus reduce the grinding effect. At the same time, there are certain safety risks when holding the connecting grinding head by hand. Secondly, after the metal arc tube is polished, the dust on the inner wall needs to be cleaned. When cleaning the metal arc tube, the arc-shaped pipeline is not convenient for cleaning inside the pipeline, resulting in the dust from grinding affecting the use of the metal arc tube. Summary of the invention

[0004] In order to solve the problems raised in the above background technology that holding the pipeline to control the angle of the grinding head and adjusting the angle for a long time will inevitably lead to instability of the grinding head and reduce the grinding effect, and there are certain safety risks in holding the connected grinding head by hand, and the metal arc pipe is not convenient for cleaning when cleaning the pipe due to its arc shape, the present invention provides a metal arc pipe inner cavity grinding device.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A metal arc tube inner cavity grinding device comprises a pipeline, an annular sleeve plate 1 is installed on one side of the outer wall of the pipeline, an annular sleeve plate 2 is installed on one end of the pipeline close to the annular sleeve plate 1, compression grooves are provided on three sides of the outer wall of the annular sleeve plate 1, and limiting grooves 1 are provided on both sides of the inner wall of the compression groove on one side, a spring 1 is installed on one side of the inner wall of the compression groove, an end of the spring 1 away from the compression groove is fixedly connected to an articulated seat 1, and the articulated seat 1 slides in the compression groove, and both sides of the articulated seat 1 are fixedly connected to limiting plates 1, and the limiting plates 1 slide in the limiting groove 1, a guide rod 1 is rotatably connected to the top of the articulated seat 1, and an end of the guide rod 1 away from the articulated seat 1 penetrates and is rotatably connected to a connecting shaft, a roller is fixedly connected to the middle part of the outer wall of the connecting shaft, and guide rods 2 are rotatably connected to both sides of the outer wall of the connecting shaft, and three articulated seats 2 are fixedly connected to the outer wall of the annular sleeve plate 2, and the side of the guide rod 2 away from the connecting shaft is rotatably connected to the articulated seat 2.

[0006] Preferably, the outer walls of the three annular sleeve plates are provided with output grooves on both sides of the compression groove, the two ends of the connecting shaft are rotatably connected with output rods 1, and the output rods 1 slide in the output grooves, the output rods 1 are rotatably connected with the end away from the connecting shaft with output rods 2, an annular cleaning plate 1 is fixedly connected to the edge of one side of the outer wall of the annular sleeve plate 1, three annular cleaning plates 2 are penetrated and slidably connected inside the annular cleaning plate 1, two grooves 1 are provided on the side of the annular cleaning plate 2 close to the output rods 2, the end of the output rods 2 away from the output rods 1 is rotatably connected inside the grooves 1, a spring groove is provided on the top of the grooves 1, a spring 2 is installed inside the spring groove, a scraper is fixedly connected to the side of the spring 2 away from the spring groove, and the scraper slides in the spring groove.

[0007] Preferably, an output rod three is fixedly connected to one side of the outer wall of the guide rod two, three annular baffle plates one are fixedly connected to the edge of one side of the outer wall of the annular sleeve plate two, annular baffle plate one is penetrated and slidably connected inside the annular baffle plate one, a groove two is formed on the side of the annular baffle plate two close to the output rod three, and the side of the output rod three away from the guide rod two is rotatably connected to the inside of the groove two.

[0008] Preferably, the outer wall of the annular sleeve plate 2 is fixedly connected with a collection box between the hinge seat 2 and the annular baffle plate 1, and a collection groove is penetrated and opened on one side of the annular baffle plate 1, and the collection groove cooperates with the collection box.

[0009] Preferably, two limiting grooves are provided on both sides of the inner cavity of the second annular cleaning plate, and two sides of the scraper are fixedly connected to the two limiting plates, and the two limiting plates slide in the two limiting grooves.

[0010] Preferably, a second connection end is installed at one end of the pipeline, and an output pipeline is installed at an end of the second connection end away from the pipeline.

[0011] Preferably, a connection end 1 is installed at one end of the output pipeline away from the connection end 2, and a pneumatic grinder is installed at one end of the connection end 1 away from the output pipeline.

[0012] Preferably, an air connection end is installed at one end of the pneumatic engraving and grinding machine away from the connection end, and the air pump is connected through the air connection end.

[0013] Preferably, one end of the pipeline away from the second connection end passes through the second annular sleeve plate and is installed with a threaded rod, and the outer wall of the threaded rod is threadedly connected with a grinding head.

[0014] Preferably, outer walls of the three rollers are all sleeved with rubber pads, and the rubber pads increase the friction force to make the grinding head work stably.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention prevents the worker from shaking the pipeline held by the operator due to holding the pipeline for a long time, which is very likely to cause the grinding head to deviate, resulting in uneven grinding of the pipeline inner cavity. When moving forward and encountering an arc curve, the roller will press downward to make the guide rod drive the hinge seat to slide in the compression groove, and at the same time make the spring to squeeze, so that the roller can always contact the inner wall of the pipeline to stabilize the grinding head. In this way, the worker can be prevented from shaking the pipeline held by the operator due to holding the pipeline for a long time, which is very likely to cause the grinding head to deviate, resulting in uneven grinding of the pipeline inner cavity, and at the same time, the safety hazard caused by holding the pipeline can be avoided.

[0016] The present invention prevents the dust left by grinding in the metal arc tube from affecting the subsequent use of the metal arc tube by arranging the cooperation of the output rod 1 and the annular cleaning plate 2. When the roller enters the inner cavity of the metal arc tube, it will drive the output rod 1 to slide in the output groove through extrusion, and at the same time drive the output rod 1 to move forward. The annular cleaning plate 2 moves upward through the movement of the output rod 1. At the same time, the output rod 1 rotates in the groove 1. During the upward movement of the annular cleaning plate 2, the scraper will be driven to move upward so that the scraper will contact the inner wall of the metal arc tube. The scraper can always maintain the contact state through the spring 2. After the grinding is completed, when the grinding head is pulled out, the dust in the metal arc tube is taken out through the scraper, so as to prevent the dust left by grinding in the metal arc tube from affecting the subsequent use of the metal arc tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the threaded rod and the grinding head of the present invention; Figure 3 It is a schematic diagram of an annular sleeve plate 1 and an annular sleeve plate 2 of the present invention; Figure 4 A cross-sectional view of an annular sleeve plate of the present invention; Figure 5 A cross-sectional view of an annular cleaning plate of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle; Figure 7 A side sectional view of an annular cleaning plate 1 and annular cleaning plate 2 of the present invention; Figure 8 A cross-sectional view of an annular baffle of the present invention; Fig. 9 For the present invention Figure 8 Enlarged view of point B in the middle.

[0018] In the figure: 1, pipeline; 2, annular sleeve plate 1; 3, annular sleeve plate 2; 4, compression groove; 5, limit groove 1; 6, spring 1; 7, hinge seat 1; 8, limit plate 1; 9, guide rod 1; 10, connecting shaft; 11, roller; 12, guide rod 2; 13, hinge seat 2; 14, output groove; 15, output rod 1; 16, output rod 2; 17, annular cleaning plate 1; 18, annular cleaning plate 2; 19, groove 1; 20. Spring groove; 21. Spring 2; 22. Scraper; 23. Limit groove 2; 24. Limit plate 2; 25. Output rod 3; 26. Annular baffle 1; 27. Annular baffle 2; 28. Groove 2; 29. ​​Collecting groove; 30. Collecting box; 31. Pneumatic grinder; 32. Connection end 1; 33. Output pipeline; 34. Connection end 2; 35. Threaded rod; 36. Grinding head; 37. Air connection end; 38. Rubber pad. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figures 1 to 9 As shown, the present invention provides a metal arc tube inner cavity grinding device, including a pipeline 1, an annular sleeve plate 2 is installed on one side of the outer wall of the pipeline 1, an annular sleeve plate 3 is installed on one end of the pipeline 1 close to the annular sleeve plate 2, compression grooves 4 are opened on three sides of the outer wall of the annular sleeve plate 2, and limiting grooves 5 are opened on both sides of the inner side of the compression groove 4 on one side, a spring 6 is installed on one side of the inner wall of the compression groove 4, and an end of the spring 6 away from the compression groove 4 is fixedly connected to a hinge seat 7, and the hinge seat 7 slides in the compression groove 4, and the hinge seat 7 The two sides of the annular sleeve plate 23 are fixedly connected with a limit plate 8, and the limit plate 8 slides in the limit groove 5, the top of the articulated seat 7 is rotatably connected with a guide rod 9, the end of the guide rod 9 away from the articulated seat 7 passes through and is rotatably connected with a connecting shaft 10, a roller 11 is fixedly connected to the middle of the outer wall of the connecting shaft 10, and the two sides of the outer wall of the connecting shaft 10 are rotatably connected with guide rods 2 12, the outer wall of the annular sleeve plate 23 is fixedly connected with three articulated seats 2 13, and the side of the guide rod 2 12 away from the connecting shaft 10 is rotatably connected to the articulated seat 2 13.

[0021] The above scheme is adopted: when the annular sleeve 1 2 and the annular sleeve 2 3 are completely entered into the pipeline, the roller 11 and the rubber pad 38 will contact the inner wall of the pipeline to fix the grinding head 36. When moving forward and encountering an arc curve, the roller 11 will press down to make the guide rod 19 drive the hinge seat 7 to slide in the compression groove 4, and at the same time make the spring 16 squeeze, so that the roller 11 can always contact the inner wall of the pipeline to stabilize the grinding head 36. In this way, it can be prevented that the staff holding the pipeline 1 for a long time will cause the shaking of the pipeline 1, which may cause the grinding head 36 to deviate, resulting in uneven grinding of the pipeline cavity, and at the same time avoid the safety hazards caused by holding the pipeline.

[0022] like Figures 1 to 9 As shown, the outer walls of the three annular sleeve plates 2 are located on both sides of the compression groove 4 and are provided with output grooves 14. The two ends of the connecting shaft 10 are rotatably connected with output rods 15, and the output rods 15 slide in the output grooves 14. The end of the output rod 15 away from the connecting shaft 10 is rotatably connected with the output rod 2 16. An annular cleaning plate 17 is fixedly connected to the edge of one side of the outer wall of the annular sleeve plate 2. Three annular cleaning plates 2 18 are penetrated and slidably connected inside the annular cleaning plate 17. Two grooves 19 are provided on the side of the annular cleaning plate 28 close to the output rod 2 16. The end of the output rod 2 16 away from the output rod 15 is rotatably connected inside the groove 19. A spring groove 20 is provided on the top of the groove 19. A spring 21 is installed inside the spring groove 20. A scraper 22 is fixedly connected to the side of the spring 21 away from the spring groove 20, and the scraper 22 slides in the spring groove 20.

[0023] The above scheme is adopted: when the roller 11 enters the inner cavity of the metal arc tube, the roller 11 drives the output rod 15 to slide in the output groove 14 through extrusion, and at the same time drives the output rod 15 to move forward. The movement of the output rod 15 causes the annular cleaning plate 2 18 to move upward, and the output rod 15 rotates in the groove 19. During the upward movement of the annular cleaning plate 2 18, the scraper 22 is driven to move upward so that the scraper 22 contacts the inner wall of the metal arc tube. The scraper 22 can always maintain a contacting state through the spring 21. After grinding is completed, the grinding head 36 is pulled out so that the dust ground in the metal arc tube is taken out through the scraper 22, so as to avoid the dust left in the metal arc tube from grinding affecting the subsequent use of the metal arc tube.

[0024] like Figures 1 to 9As shown, an output rod 3 25 is fixedly connected to one side of the outer wall of the guide rod 2 12, three annular baffles 1 26 are fixedly connected to the edge of one side of the outer wall of the annular sleeve plate 2 3, an annular baffle 2 27 is penetrated and slidably connected inside the annular baffle 1 26 on one side, a groove 28 is provided on the side of the annular baffle 2 27 close to the output rod 3 25, and the side of the output rod 3 25 away from the guide rod 2 12 is rotatably connected inside the groove 28; The outer wall of the annular sleeve plate 2 3 is fixedly connected with a collection box 30 between the hinge seat 2 13 and the annular baffle plate 1 26 . A collection groove 29 is penetrated and opened on one side of the annular baffle plate 1 26 , and the collection groove 29 cooperates with the collection box 30 .

[0025] By adopting the above scheme, when the roller 11 enters the inner cavity of the metal arc tube to squeeze and cause the roller 11 to descend, the guide rod 2 12 will be lowered, and when the guide rod 2 12 descends, the output rod 3 25 can be moved upward, and the force of the upward movement of the output rod 3 25 drives the annular baffle plate 2 27 to move upward so that the inner wall of the metal arc tube of the annular baffle plate 2 27 can be prevented from affecting the components connected to the outer wall of the annular sleeve plate 1 2 and the annular sleeve plate 2 3 by the dust generated during grinding; The dust blocked by the annular baffle 1 26 and the annular baffle 2 27 will enter the collection box 30 through the collection groove 29 for collection.

[0026] like Figures 1 to 9 As shown, two limiting grooves 23 are provided on both sides of the inner cavity of the annular cleaning plate 18 , and two limiting plates 24 are fixedly connected to both sides of the scraper 22 , and the limiting plates 24 slide in the limiting grooves 23 .

[0027] By adopting the above solution, the cooperation between the second limiting groove 23 and the second limiting plate 24 can prevent the scraper 22 from being separated from the second annular cleaning plate 18 .

[0028] like Figures 1 to 9 As shown, a connection end 2 34 is installed at one end of the pipeline 1, an output pipeline 33 is installed at the end of the connection end 2 34 away from the pipeline 1, a connection end 1 32 is installed at the end of the output pipeline 33 away from the connection end 2 34, a pneumatic grinder 31 is installed at the end of the connection end 1 32 away from the output pipeline 33, an air connecting end 37 is installed at the end of the pneumatic grinder 31 away from the connection end 1 32, and an air pump is connected through the air connecting end 37, the end of the pipeline 1 away from the connection end 2 34 passes through the annular sleeve plate 2 3 and is installed with a threaded rod 35, the outer wall of the threaded rod 35 is threadedly connected with a grinding head 36, and the outer walls of the three rollers 11 are all provided with rubber pads 38, and the rubber pads 38 increase the friction force to make the grinding head 36 work stably.

[0029] The above solution is adopted: firstly, the air connection end 37 is connected to the air pump and then the pneumatic grinder 31 is turned on to make the threaded rod 35 drive the grinding head 36 to rotate through the output pipeline 33 and the pipeline 1 to grind the inner cavity of the pipeline.

[0030] The working principle and use process of the present invention: When working, first place the grinding head 36 in the pipe to be polished, then turn on the pneumatic grinder 31, through the output pipeline 33 and the pipeline 1, the threaded rod 35 drives the grinding head 36 to rotate to grind the inner cavity of the pipeline, and then the grinding head 36 is directed forward through the air connection end 37. When the annular sleeve plate 1 2 and the annular sleeve plate 2 3 are completely entered into the pipeline, the roller 11 and the rubber pad 38 will contact the inner wall of the pipeline to fix the grinding head 36. When moving forward and encountering an arc bend, the roller 11 will press downward to make the guide rod 19 drive the hinge seat 17 to slide in the compression groove 4, and at the same time make the spring 16 squeeze, so that the roller 11 can always contact the inner wall of the pipeline to stabilize the grinding head 36. In this way, it can prevent the staff from shaking the pipeline 1 held for a long time, which is very likely to cause the grinding head 36 to deviate, resulting in uneven grinding of the inner cavity of the pipeline, and at the same time avoid the safety hazards caused by hand holding. When the roller 11 enters the inner cavity of the metal arc tube, the roller 11 drives the output rod 15 to slide in the output groove 14 through extrusion, and drives the output rod 15 to move forward. The movement of the output rod 15 causes the annular cleaning plate 2 18 to move upward. At the same time, the output rod 15 rotates in the groove 19. During the upward movement of the annular cleaning plate 2 18, the scraper 22 is driven to move upward so that the scraper 22 contacts the inner wall of the metal arc tube. The scraper 22 can always maintain the contact state through the spring 21. After the grinding is completed, the grinding head 36 is pulled out so that the dust in the metal arc tube is taken out through the scraper 22, so as to avoid the dust left in the metal arc tube from being affected by the subsequent use of the metal arc tube. When the roller 11 enters the inner cavity of the metal arc tube to squeeze and squeeze the roller 11 to descend, the guide rod 2 12 will also descend. When the guide rod 2 12 descends, the output rod 3 25 can move upward. The upward movement of the output rod 3 25 drives the annular baffle 2 27 to move upward so that the inner wall of the metal arc tube of the annular baffle 2 27 can be prevented from the dust generated during grinding affecting the components connected to the outer wall of the annular sleeve plate 1 2 and the annular sleeve plate 2 3. At the same time, the dust blocked by the annular baffle 1 26 and the annular baffle 2 27 will enter the collection box 30 through the collection groove 29 for collection.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal arc tube inner cavity grinding device, comprising a pipeline (1) characterized by: An annular sleeve plate 1 (2) is installed on one side of the outer wall of the pipeline (1), and an annular sleeve plate 2 (3) is installed on one end of the pipeline (1) close to the annular sleeve plate 1 (2). Compression grooves (4) are provided on three sides of the outer wall of the annular sleeve plate 1 (2), and limiting grooves 1 (5) are provided on both sides of the interior of the compression groove (4). A spring 1 (6) is installed on one side of the inner wall of the compression groove (4), and an end of the spring 1 (6) away from the compression groove (4) is fixedly connected to a hinge seat 1 (7), and the hinge seat 1 (7) slides in the compression groove (4), and both sides of the hinge seat 1 (7) are fixedly connected to the limiting plate 1 ( 8), and the limiting plate 1 (8) slides in the limiting groove 1 (5), the top of the hinge seat 1 (7) is rotatably connected to a guide rod 1 (9), the end of the guide rod 1 (9) away from the hinge seat 1 (7) passes through and is rotatably connected to a connecting shaft (10), a roller (11) is fixedly connected to the middle of the outer wall of the connecting shaft (10), and guide rods 2 (12) are rotatably connected to both sides of the outer wall of the connecting shaft (10), the outer wall of the annular sleeve plate 2 (3) is fixedly connected to three hinge seats 2 (13), and the side of the guide rod 2 (12) away from the connecting shaft (10) is rotatably connected to the hinge seat 2 (13).

2. The metal arc tube inner cavity grinding device according to claim 1, characterized in that: The outer walls of the three annular sleeve plates (2) are provided with output grooves (14) on both sides of the compression groove (4); the two ends of the connecting shaft (10) are rotatably connected to output rods (15), and the output rods (15) slide in the output grooves (14); the end of the output rods (15) away from the connecting shaft (10) is rotatably connected to output rods (16); an annular cleaning plate (17) is fixedly connected to the edge of one side of the outer wall of the annular sleeve plate (2); and three annular cleaning plates (17) are penetrated and slidably connected inside the annular cleaning plate (17). A second cleaning plate (18), wherein two first grooves (19) are formed on a side of the second annular cleaning plate (18) close to the second output rod (16), and one end of the second output rod (16) away from the first output rod (15) is rotatably connected to the inside of the first groove (19), and a spring groove (20) is formed on the top of the first groove (19), and a second spring (21) is installed inside the spring groove (20), and a scraper (22) is fixedly connected to the side of the second spring (21) away from the spring groove (20), and the scraper (22) slides in the spring groove (20).

3. The metal arc tube inner cavity grinding device according to claim 1, characterized in that: An output rod 3 (25) is fixedly connected to one side of the outer wall of the guide rod 2 (12) on one side, three annular baffles 1 (26) are fixedly connected to the edge of one side of the outer wall of the annular sleeve plate 2 (3), an annular baffle 2 (27) penetrates through and is slidably connected to the inside of the annular baffle 1 (26) on one side, a groove 2 (28) is formed on the side of the annular baffle 2 (27) close to the output rod 3 (25), and the side of the output rod 3 (25) away from the guide rod 2 (12) is rotatably connected to the inside of the groove 2 (28).

4. The metal arc tube inner cavity grinding device according to claim 1, characterized in that: The outer wall of the annular sleeve plate 2 (3) is fixedly connected with a collection box (30) between the hinge seat 2 (13) and the annular baffle plate 1 (26), and a collection groove (29) is penetrated and opened on one side of the annular baffle plate 1 (26), and the collection groove (29) is matched with the collection box (30).

5. The metal arc tube inner cavity grinding device according to claim 2, characterized in that: The inner cavity of the second annular cleaning plate (18) is provided with two limiting grooves (23), and the two sides of the scraper (22) are fixedly connected to the second limiting plate (24), and the second limiting plate (24) slides in the second limiting groove (23).

6. The metal arc tube inner cavity grinding device according to claim 1, characterized in that: A second connection end (34) is installed at one end of the pipeline (1), and an output pipeline (33) is installed at the end of the second connection end (34) away from the pipeline (1).

7. The metal arc tube inner cavity grinding device according to claim 6, characterized in that: A connection end 1 (32) is installed at one end of the output pipeline (33) away from the connection end 2 (34), and a pneumatic grinder (31) is installed at one end of the connection end 1 (32) away from the output pipeline (33).

8. The metal arc tube inner cavity grinding device according to claim 7, characterized in that: An air connection end (37) is installed at one end of the pneumatic grinder (31) away from the connection end (32), and is connected to an air pump via the air connection end (37).

9. The metal arc tube inner cavity grinding device according to claim 1, characterized in that: One end of the pipeline (1) away from the second connection end (34) passes through the second annular sleeve plate (3) and is installed with a threaded rod (35), and the outer wall of the threaded rod (35) is threadedly connected with a grinding head (36).

10. The metal arc tube inner cavity grinding device according to claim 1, characterized in that: The outer walls of the three rollers (11) are all sleeved with rubber pads (38), and the rubber pads (38) increase the friction force so that the grinding head (36) works stably.

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