Rotary pneumatic grinder

Abstract

The application relates to the technical field of grinding machines, and discloses a rotary pneumatic grinding machine which comprises a grinding machine body and a grinding disc rotatably arranged at one end of the grinding machine body, an annular limiting groove is formed in the outer side of the grinding machine body, a protective semicircular cover is arranged on the outer side of the grinding disc and is in sliding connection with the annular limiting groove, and a placing groove is formed in one end of the protective semicircular cover. The protective semicircular cover is arranged on the outer side of the grinding disc and is in sliding connection with the annular limiting groove, a connecting frame is in sliding connection in the placing cavity of the protective semicircular cover, an arc-shaped limiting rod connected with a limiting hole is arranged in the limiting barrel on one side of the connecting frame, when working, the arc-shaped limiting rod is controlled to be connected with the limiting hole, the protective semicircular cover can be fixed, waste can be prevented from splashing to the side of the worker, the arc-shaped limiting rod is controlled to be separated from the limiting hole, the protective semicircular cover can rotate, the worker can comprehensively detect the upper end of the grinding disc, and the grinding disc does not need to be disassembled for detection.

Description

Technical Field

[0001] This invention relates to the field of grinding machine technology, specifically a rotary pneumatic grinding machine. Background Technology

[0002] Grinding wheel machines are commonly used equipment for sharpening various knives and tools. They are also used for grinding, deburring, and cleaning small parts. They can be categorized into vertical grinding wheel machines, suspended grinding wheel machines, benchtop grinding wheel machines, and pneumatic grinding wheel machines. Existing pneumatic grinding wheel machines, such as the one disclosed in authorization announcement number CN208528752U, have a protective component installed at the lower end of the rotating base. The protective plate moves downwards, and the fixing plate locks the locking block, thus covering the grinding wheel blade with the protective plate. This prevents accidental injury when the user accidentally touches the switch, as the grinding wheel blade will not rotate, improving safety. An air pipe fixing component is installed at one end of the air pipe fixing sleeve. Through the elastic force of the connecting spring, the fixing seat tightly clamps the air pipe, thus doubly fixing the air pipe through the air pipe fixing sleeve and the fixing seat, preventing the air pipe from falling off due to loose connection.

[0003] Existing pneumatic grinding machines achieve grinding and other tasks through the rapid rotation of the grinding wheel. Similar to the aforementioned existing technology, protective covers are generally installed to prevent waste from flying during grinding. However, existing grinding wheels require inspection after a period of use. If chips or cracks appear, they need to be replaced. Chips around the grinding wheel and cracks at the lower end are relatively easy to observe. However, because the upper part of the grinding wheel is inside the protective cover, it is inconvenient to inspect for cracks, making it difficult to detect and replace the wheel in time, thus posing a safety hazard to workers. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a rotary pneumatic grinding machine that facilitates timely inspection of the grinding wheel disc inside the protective cover.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a rotary pneumatic grinding machine, comprising a grinding machine body and a grinding wheel disk rotatably disposed at one end of the grinding machine body. An annular limiting groove is provided on the outer side of the grinding machine body. A protective semi-circular cover is provided on the outer side of the grinding wheel disk, slidably connected to the annular limiting groove. A placement groove is provided at one end of the protective semi-circular cover, and a detection component is slidably disposed within the placement groove. The detection component includes a magnifying glass located within the placement groove. An installation groove is provided at the other end of the protective semi-circular cover, and a cleaning component is disposed within the installation groove. A placement cavity communicating with the placement groove and the installation groove is provided inside the protective semi-circular cover. A rotating component is rotatably mounted within the placement cavity. A connecting component connected to the grinding machine body is also provided within the placement cavity. The rotating component is used to control the movement of the magnifying glass, the cleaning component, and the connecting component. The rotating component includes a T-shaped rotating rod rotatably mounted through the protective semi-circular cover, and a limiting component is provided on the outer side of the T-shaped rotating rod.

[0006] Preferably, the detection component further includes a first arc-shaped frame slidably connected to the placement cavity, with locking teeth fixedly installed on both inner sides of the first arc-shaped frame, and a fixing frame fixedly installed on the outer side of the magnifying glass, with one end of the first arc-shaped frame fixedly connected to the fixing frame.

[0007] Preferably, the connecting assembly includes a mounting frame that is slidably connected to the placement cavity. Connecting teeth are fixedly installed on both inner sides of the mounting frame. A limiting cylinder is fixedly installed on one side of the mounting frame. A limiting hole is opened on the side wall of the annular limiting groove. A telescopic component connected to the limiting hole is provided at one end of the limiting cylinder.

[0008] Preferably, the telescopic assembly includes an arc-shaped limiting rod that is slidably connected to the limiting cylinder, the arc-shaped limiting rod being slidably connected to the limiting hole, and a connecting spring being fixedly provided between the arc-shaped limiting rod and the limiting cylinder.

[0009] Preferably, the cleaning assembly includes a second arc-shaped frame slidably connected to the placement cavity. Fixing teeth are fixedly installed on both inner sides of the second arc-shaped frame. A connecting frame is fixedly installed at one end of the second arc-shaped frame. Two elastic connecting rods are rotatably installed inside the connecting frame. A fixing shaft is fixedly installed on the inner side of the two elastic connecting rods. An adhesive tube is rotatably sleeved on the fixing shaft. A spring shaft is fixedly installed on one side of each elastic connecting rod. The elastic connecting rod is rotatably connected to the connecting frame through the spring shaft.

[0010] Preferably, the rotating assembly further includes a first toothed ring, a second toothed ring, and a third toothed ring fixedly sleeved on the outside of the T-shaped rotating rod. The first toothed ring meshes with the connecting tooth, the second toothed ring meshes with the fixed tooth, and the third toothed ring meshes with the locking tooth.

[0011] Preferably, the limiting component includes a ring fixedly sleeved on the outside of the T-shaped rotating rod, a fixing ring fixedly installed in the placement cavity, a plurality of slots opened on the inner side of the fixing ring, and a plurality of elastic blocks fixedly installed on the outer side of the ring.

[0012] Preferably, a first sealing plate is fixedly installed on one side of the placement groove opening of the fixing frame, and a second sealing plate is fixedly installed on the outer side of the connecting frame on one side of the installation groove opening.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention provides a protective semi-circular cover that is slidably connected to an annular limiting groove on the outside of the grinding wheel. A connecting frame is slidably connected inside the placement cavity of the protective semi-circular cover. An arc-shaped limiting rod connected to a limiting hole is slidably installed inside a limiting cylinder on one side of the connecting frame. During operation, the protective semi-circular cover can be fixed by controlling the arc-shaped limiting rod to connect with the limiting hole to prevent waste from splashing onto the workers. By controlling the arc-shaped limiting rod to disengage from the limiting hole, the protective semi-circular cover can be rotated. At this time, the workers can perform a comprehensive inspection of the upper part of the grinding wheel without removing the grinding wheel for inspection, making the operation more convenient.

[0014] 2. The present invention provides a magnifying glass in the placement slot and a first arc-shaped frame that is slidably connected in the placement cavity. The first arc-shaped frame is connected to a fixed frame on the outside of the magnifying glass. By controlling the movement of the first arc-shaped frame, the magnifying glass can be pushed out. When performing a comprehensive inspection on the upper end of the grinding wheel, the cracks can be seen more intuitively through the magnifying glass.

[0015] 3. This invention involves sliding a second arc-shaped frame within the placement cavity, rotatably installing two elastic connecting rods within a connecting frame at one end of the second arc-shaped frame, and rotatably mounting an adhesive tube on a fixed shaft inside the two elastic connecting rods. By controlling the movement of the second arc-shaped frame, the adhesive tube can be pushed out. Through the cooperation of a spring shaft, the adhesive tube contacts the upper end of the grinding wheel. When performing a comprehensive inspection of the upper end of the grinding wheel, the adhesive tube can remove some debris from the upper end of the grinding wheel, thus avoiding interference with the detection of cracks. Attached Figure Description

[0016] Figure 1 This is a side view of the overall three-dimensional structure of the present invention; Figure 2 This is a top-view three-dimensional structural diagram of the present invention; Figure 3 This is a partial three-dimensional cross-sectional structural diagram of the main body of the grinding wheel machine of the present invention; Figure 4 for Figure 3 A magnified structural diagram of B in the diagram; Figure 5 This is a schematic diagram of the overall top-view three-dimensional cross-sectional structure of the present invention; Figure 6 for Figure 5 A magnified structural diagram of A in the middle; Figure 7 This is a three-dimensional cross-sectional structural diagram of the protective semi-circular cover of the present invention; Figure 8 for Figure 7 A magnified structural diagram of D in the diagram; Figure 9 This is a top-view three-dimensional cross-sectional structural diagram of the protective semi-circular cover of the present invention; Figure 10 for Figure 9 A magnified structural diagram of C; Figure 11 This is a three-dimensional structural diagram of the detection component of the present invention; Figure 12 This is a three-dimensional structural diagram of the cleaning component of the present invention; Figure 13 This is a three-dimensional structural schematic diagram of the rotating component of the present invention; Figure 14 This is a three-dimensional structural diagram of the adhesive tube of the present invention.

[0017] In the diagram: 1. Grinding wheel body; 2. Grinding wheel disc; 3. Annular limiting groove; 4. Protective semi-circular cover; 5. Placement groove; 6. Installation groove; 7. Placement cavity; 8. T-shaped rotating rod; 9. Magnifying glass; 10. First arc-shaped frame; 11. Clamping tooth; 12. First sealing plate; 13. First toothed ring; 14. Fixing frame; 15. Fixing tooth; 16. Connecting tooth; 17. Second arc-shaped frame; 18. Connecting frame; 19. Elastic connecting rod; 20. Adhesive tube; 21. Installation frame; 22. Limiting tube; 23. Limiting hole; 24. Arc-shaped limiting rod; 25. Connecting spring; 26. Third toothed ring; 27. Second toothed ring; 28. Spring rotating shaft; 29. ​​Fixing shaft; 30. Second sealing plate; 31. Bayonet; 32. Fixing ring; 34. Circular ring; 35. Elastic locking block. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0019] Example Please see Figures 1-14A rotary pneumatic grinder includes a grinder body 1 and a grinding wheel disc 2 rotatably mounted at one end of the grinder body 1. An annular limiting groove 3 is formed on the outer side of the grinder body 1. A protective semi-circular cover 4, slidably connected to the annular limiting groove 3, is formed on the outer side of the grinding wheel disc 2. A placement groove 5 is formed at one end of the protective semi-circular cover 4, and a detection component, including a magnifying glass 9 located within the placement groove 5, is slidably mounted therein. A mounting groove 6 is formed at the other end of the protective semi-circular cover 4, and a cleaning component is disposed within the mounting groove 6. A placement cavity 7, communicating with the placement groove 5 and the mounting groove 6, is formed inside the protective semi-circular cover 4. A rotating component is rotatably mounted within the placement cavity 7. A connecting component, connected to the grinder body 1, is also disposed within the placement cavity 7. The rotating component controls the movement of the magnifying glass 9, the cleaning component, and the connecting component. The connecting component includes a mounting frame slidably connected to the placement cavity 7. 21. Connecting teeth 16 are fixedly installed on both inner sides of the mounting frame 21. A limiting cylinder 22 is fixedly installed on one side of the mounting frame 21. A limiting hole 23 is opened on the side wall of the annular limiting groove 3. A telescopic component connected to the limiting hole 23 is provided at one end of the limiting cylinder 22. The telescopic component includes an arc-shaped limiting rod 24 that is slidably connected to the limiting cylinder 22. The arc-shaped limiting rod 24 is slidably connected to the limiting hole 23. A connecting spring 25 is fixedly provided between the arc-shaped limiting rod 24 and the limiting cylinder 22. During operation, by controlling the arc-shaped limiting rod 24 to connect with the limiting hole 23, the protective semi-circular cover 4 can be fixed to prevent waste from splashing onto the workers. By controlling the arc-shaped limiting rod 24 to disengage from the limiting hole 23, the protective semi-circular cover 4 can rotate. At this time, the workers can perform a comprehensive inspection of the upper end of the grinding wheel 2 without removing the grinding wheel 2 for inspection, which is more convenient. The detection assembly also includes a first arc-shaped frame 10 that is slidably connected to the placement cavity 7. The first arc-shaped frame 10 has locking teeth 11 fixedly installed on both inner sides. A fixing frame 14 is fixedly installed on the outer side of the magnifying glass 9. One end of the first arc-shaped frame 10 is fixedly connected to the fixing frame 14. By controlling the movement of the first arc-shaped frame 10, the magnifying glass 9 can be pushed out. When performing a comprehensive inspection on the upper end of the grinding wheel 2, the crack can be seen more intuitively through the magnifying glass 9. The cleaning assembly includes a second arc-shaped frame 17 slidably connected to the placement cavity 7. Fixing teeth 15 are fixedly installed on both inner sides of the second arc-shaped frame 17. A connecting frame 18 is fixedly installed at one end of the second arc-shaped frame 17. Two elastic connecting rods 19 are rotatably installed inside the connecting frame 18. A fixing shaft 29 is fixedly installed on the inner side of the two elastic connecting rods 19. An adhesive tube 20 (similar to a lint roller in the prior art, consisting of layers of peelable adhesive paper wrapped around a paper tube; each time it is used, the previously used adhesive paper can be peeled off, and new adhesive paper contacts the grinding wheel 2. When in contact, the elastic connecting rods 19 are in an inclined state, even when sticking...) Even after the diameter of the tube 20 is reduced, the adhesive tube 20 can still contact the upper end of the grinding wheel 2. A spring shaft 28 is fixedly installed on one side of the elastic connecting rod 19. The elastic connecting rod 19 is rotatably connected to the connecting frame 18 through the spring shaft 28. By controlling the movement of the second arc frame 17, the adhesive tube 20 can be pushed out. With the cooperation of the spring shaft 28, the adhesive tube 20 contacts the upper end of the grinding wheel 2. When performing a full inspection of the upper end of the grinding wheel 2, the adhesive tube 20 can remove some of the debris from the upper end of the grinding wheel 2 to avoid affecting the detection of cracks. The elastic connecting rod 19 is elastic and can be bent to deform, so that the adhesive tube 20 can be replaced. The rotating assembly includes a T-shaped rotating rod 8 that is rotatably mounted on the protective semi-circular cover 4, and a limit component is provided on the outside of the T-shaped rotating rod 8.

[0020] As a further technical solution of the present invention, the rotating assembly also includes a first toothed ring 13, a second toothed ring 27, and a third toothed ring 26 fixedly sleeved on the outside of the T-shaped rotating rod 8. The first toothed ring 13 meshes with the connecting tooth 16, the second toothed ring 27 meshes with the fixed tooth 15, and the third toothed ring 26 meshes with the locking tooth 11. When the T-shaped rotating rod 8 is rotated, through the cooperation of the first toothed ring 13 with the connecting tooth 16, the cooperation of the second toothed ring 27 with the fixed tooth 15, and the cooperation of the third toothed ring 26 with the locking tooth 11, the first arc-shaped frame 10 can be moved to push out the magnifying glass 9, the second arc-shaped frame 17 can be moved to push out the adhesive tube 20, and the arc-shaped limiting rod 24 can be moved to disengage from the limiting hole 23 for detection work. When the T-shaped rotating rod 8 is rotated further, the first arc-shaped frame 10 can be moved to drive the magnifying glass 9 to reset, the second arc-shaped frame 17 can be moved to drive the adhesive tube 20 to reset, and the arc-shaped limiting rod 24 can be moved to connect with the limiting hole 23.

[0021] As a further technical solution of the present invention, the limiting component includes a ring 34 fixedly sleeved on the outside of the T-shaped rotating rod 8, a fixing ring 32 fixedly installed in the placement cavity 7, a plurality of slots 31 opened on the inner side of the fixing ring 32, and a plurality of elastic blocks 35 fixedly installed on the outer side of the ring 34. When the T-shaped rotating rod 8 is rotated, the T-shaped rotating rod 8 drives the ring 34 to rotate, so that the elastic blocks 35 are compressed. When the T-shaped rotating rod 8 is not rotated, the first toothed ring 13, the second toothed ring 27 and the third toothed ring 26 can be kept stationary by the cooperation of the uncompressed elastic blocks 35 with the slots 31.

[0022] As a further technical solution of the present invention, a first sealing plate 12 is fixedly installed on one side of the groove opening of the placement groove 5 in the fixing frame 14, and a second sealing plate 30 is fixedly installed on the outer side of the connecting frame 18 on one side of the groove opening of the installation groove 6, which can seal the placement groove 5 and the installation groove 6 to prevent debris from splashing into the placement groove 5 and the installation groove 6.

[0023] Working principle: During normal operation, the arc-shaped limiting rod 24 is connected to the limiting hole 23, which can fix the protective semi-circular cover 4 to prevent waste from splashing onto the workers. When crack detection is required on the grinding wheel 2, rotate the T-shaped rotating rod 8. The T-shaped rotating rod 8 drives the first toothed ring 13, the second toothed ring 27, the third toothed ring 26 and the circular ring 34 to rotate. The first toothed ring 13 engages with the connecting tooth 16 on one side of the mounting frame 21, which can drive the mounting frame 21 to move. The mounting frame 21 drives the limiting cylinder 22 to move, and the compressed connecting spring 25 gradually resets until it drives the arc-shaped limiting rod 24 to disengage from the limiting hole 23. The third toothed ring 26 engages with the locking tooth 11 on one side of the first arc frame 10, which can drive the first arc frame 10 to move. The first arc frame 10 drives the fixed frame 14 to move, so that the first sealing plate 12 moves to open the placement groove 5. When the arc-shaped limiting rod 24 disengages from the limiting hole 23, the magnifying glass 9 is pushed out of the placement groove 5. The second toothed ring 27 engages with the fixed tooth 15 on one side of the second arc-shaped frame 17, which can drive the second arc-shaped frame 17 to move. The second arc-shaped frame 17 drives the connecting frame 18 to move, causing the second sealing plate 30 to move and open the mounting groove 6. When the arc-shaped limiting rod 24 disengages from the limiting hole 23, the adhesive tube 20 is pushed out from the mounting groove 6. Due to the cooperation of the spring shaft 28, the adhesive tube 20 contacts the upper end of the grinding wheel 2. When in contact, the elastic connecting rod 19 is in an inclined state. Even after the diameter of the adhesive tube 20 becomes smaller, the adhesive tube 20 can still contact the upper end of the grinding wheel 2. (The adhesive tube 20 is similar to the existing lint roller, which is composed of layers of peelable adhesive paper wrapped around a paper tube. The multiple adhesive papers are not connected. Each time it is used, the previously used adhesive paper can be peeled off, and the new adhesive paper contacts the grinding wheel 2.) The ring 34 drives the elastic block 35 to move. When it moves, the elastic block 35 is compressed. When the T-shaped rotating rod 8 stops rotating, the first toothed ring 13, the second toothed ring 27 and the third toothed ring 26 can be kept stationary by the cooperation of the uncompressed elastic block 35 and the bayonet 31. Then rotate the protective semicircular cover 4 to move the adhesive tube 20 and the magnifying glass 9 to inspect the upper end of the grinding wheel 2 for cracks. After the test is completed, rotate the T-shaped rotating rod 8 to continue moving. The T-shaped rotating rod 8 drives the first toothed ring 13, the second toothed ring 27, the third toothed ring 26 and the ring 34 to continue rotating. The first toothed ring 13 engages with the connecting tooth 16 on the other side of the mounting frame 21, causing the mounting frame 21 to move back. The mounting frame 21 then moves the limiting cylinder 22. At this point, the arc-shaped limiting rod 24 does not correspond to the limiting hole 23, causing the connecting spring 25 to be compressed. Then, the protective semi-circular cover 4 continues to rotate until the arc-shaped limiting rod 24 corresponds to the limiting hole 23. Due to the action of the connecting spring 25, the arc-shaped limiting rod 24 is pushed to connect with the limiting hole 23. (By setting the connecting spring 25 and the arc-shaped limiting rod 24, it is easier to detect when not in sight.) (The lower control arc-shaped limiting rod 24 is connected to the limiting hole 23). At this time, the T-shaped rotating rod 8 continues to rotate, and the mounting frame 21 moves back to continue pushing the arc-shaped limiting rod 24, so that the connecting spring 25 is compressed. The second toothed ring 27 can drive the second arc-shaped frame 17 to move back by meshing with the fixed tooth 15 on the other side of the second arc-shaped frame 17, and move the adhesive tube 20 into the mounting groove 6. The third toothed ring 26 can drive the first arc-shaped frame 10 to move back by meshing with the locking tooth 11 on the other side of the first arc-shaped frame 10, and retract the magnifying glass 9 into the placement groove 5.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will readily make equivalent substitutions for its features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotary pneumatic grinding machine, comprising a grinding machine body (1) and a grinding wheel disc (2) rotatably disposed at one end of the grinding machine body (1), characterized in that, The grinding wheel body (1) has an annular limiting groove (3) on its outer side. The grinding wheel disc (2) has a protective semicircular cover (4) that is slidably connected to the annular limiting groove (3) on its outer side. One end of the protective semicircular cover (4) has a placement groove (5). A detection component is slidably arranged in the placement groove (5). The detection component includes a magnifying glass (9) located in the placement groove (5). The other end of the protective semicircular cover (4) has an installation groove (6). A cleaning component is arranged in the installation groove (6). The protective semicircular cover (4) has a placement cavity (7) that communicates with the placement groove (5) and the installation groove (6). A rotating component is rotatably installed in the placement cavity (7). A connecting component connected to the grinding wheel body (1) is also arranged in the placement cavity (7). The rotating component is used to control the movement of the magnifying glass (9), the cleaning component and the connecting component. The rotating component includes a T-shaped rotating rod (8) that is rotatably installed through the protective semicircular cover (4). A limiting component is arranged on the outer side of the T-shaped rotating rod (8).

2. The rotary pneumatic grinding machine according to claim 1, characterized in that, The detection assembly also includes a first arc-shaped frame (10) that is slidably connected to the placement cavity (7). The first arc-shaped frame (10) has two inner sides with fixed teeth (11). The magnifying glass (9) has a fixed frame (14) that is fixedly installed on the outside. One end of the first arc-shaped frame (10) is fixedly connected to the fixed frame (14).

3. A rotary pneumatic grinding machine according to claim 2, characterized in that, The connecting assembly includes a mounting frame (21) that is slidably connected to the placement cavity (7). Connecting teeth (16) are fixedly installed on both inner sides of the mounting frame (21). A limiting cylinder (22) is fixedly installed on one side of the mounting frame (21). A limiting hole (23) is opened on the side wall of the annular limiting groove (3). A telescopic assembly connected to the limiting hole (23) is provided at one end of the limiting cylinder (22).

4. A rotary pneumatic grinding machine according to claim 3, characterized in that, The telescopic assembly includes an arc-shaped limiting rod (24) that is slidably connected to the limiting cylinder (22). The arc-shaped limiting rod (24) is slidably connected to the limiting hole (23). A connecting spring (25) is fixedly provided between the arc-shaped limiting rod (24) and the limiting cylinder (22).

5. A rotary pneumatic grinding machine according to claim 4, characterized in that, The cleaning assembly includes a second arc-shaped frame (17) that is slidably connected to the placement cavity (7). Fixing teeth (15) are fixedly installed on both inner sides of the second arc-shaped frame (17). A connecting frame (18) is fixedly installed at one end of the second arc-shaped frame (17). Two elastic connecting rods (19) are rotatably installed inside the connecting frame (18). A fixing shaft (29) is fixedly installed on the inner side of the two elastic connecting rods (19). An adhesive tube (20) is rotatably sleeved on the fixing shaft (29). A spring shaft (28) is fixedly installed on one side of the elastic connecting rod (19). The elastic connecting rod (19) is rotatably connected to the connecting frame (18) through the spring shaft (28).

6. A rotary pneumatic grinding machine according to claim 5, characterized in that, The rotating assembly further includes a first toothed ring (13), a second toothed ring (27), and a third toothed ring (26) fixedly sleeved on the outside of the T-shaped rotating rod (8). The first toothed ring (13) meshes with the connecting tooth (16), the second toothed ring (27) meshes with the fixed tooth (15), and the third toothed ring (26) meshes with the locking tooth (11).

7. A rotary pneumatic grinding machine according to claim 6, characterized in that, The limiting component includes a ring (34) fixedly sleeved on the outside of the T-shaped rotating rod (8), a fixing ring (32) fixedly installed in the placement cavity (7), a plurality of slots (31) are opened on the inner side of the fixing ring (32), and a plurality of elastic blocks (35) are fixedly installed on the outer side of the ring (34).

8. A rotary pneumatic grinding machine according to claim 7, characterized in that, The fixing frame (14) is fixedly installed with a first sealing plate (12) on one side of the groove opening of the placement groove (5), and the connecting frame (18) is fixedly installed with a second sealing plate (30) on the outside of the groove opening of the installation groove (6).

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