Pipe polisher

Abstract

The utility model discloses a pipe polisher which comprises a shell, a polishing pipe and a rotating shaft, the polishing pipe and the rotating shaft are rotatably connected into the shell, the inner side face of the polishing pipe is a polishing face, the outer end of the rotating shaft is provided with a transmission connecting portion connected with an external rotating device, the inner end of the rotating shaft is provided with a driving gear, and a gear ring is fixedly installed on the outer side of the polishing pipe. Teeth of the driving gear are meshed with teeth of the gear ring, and the two ends of the grinding pipe are exposed out of the shell. According to the pipe polisher, due to the fact that the shape of the inner side of the polishing pipe is matched with the shape of the outer side of the pipe, in the pipe polishing process, an operator does not need to rotate the pipe, the polishing pipe can conduct circumferential polishing treatment on the surface of the pipe, operation is convenient, working efficiency is high, and polishing on the surface of the pipe is more uniform.

Description

Technical Field

[0001] This utility model belongs to the field of pipe surface grinding technology, and specifically relates to a pipe grinder. Background Technology

[0002] Currently, the grinding of the outer surface of pipes is done manually. The specific operation method is as follows: the operator holds the pipe and then brings the surface of the pipe close to the grinding belt or grinding wheel of the grinding machine for grinding. During the grinding process, the operator also needs to rotate the pipe to perform circumferential grinding on the outer surface of the pipe. The operation is very inconvenient, the work efficiency is low, and the quality of the ground surface of the pipe is not easy to guarantee. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a pipe grinder that is easy to operate.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a pipe grinder, comprising a shell, a grinding tube rotatably connected within the shell, and a rotating shaft. The inner surface of the grinding tube is a grinding surface. The outer end of the rotating shaft is provided with a transmission connection part connected to an external rotating device. The inner end of the rotating shaft is provided with a drive gear. A gear ring is fixedly installed on the outer side of the grinding tube. The teeth of the drive gear mesh with the teeth of the gear ring. Both ends of the grinding tube are exposed outside the shell.

[0005] In the above solution, a grinding tube is rotatably connected inside the outer casing. During use, the pipe to be ground can be inserted into the grinding tube. Then, an external rotating device, such as an electric drill, is connected to a transmission connection. The electric drill drives a rotating shaft, and simultaneously, a drive gear rotates. This drive gear, in turn, drives a gear ring, causing the grinding tube to rotate. This allows the grinding surface inside the grinding tube to grind the pipe surface. After grinding is complete, the electric drill is turned off, and the ground pipe is removed from the grinding tube, thus completing the pipe surface grinding operation. Because the inner shape of the grinding tube matches the outer shape of the pipe, the operator does not need to rotate the pipe during the grinding process. The grinding tube can perform circumferential grinding on the pipe surface, making the operation convenient, efficient, and resulting in more uniform grinding of the pipe surface.

[0006] Furthermore, the aforementioned grinding tube includes a tube body rotatably connected within the outer casing, an annular grinding body placed within the tube body, a left end cap located at the left end of the tube body, and a right end cap located at the right end of the tube body. A toothed ring is fixedly installed on the outer side of the tube body. The inner surface of the annular grinding body is the grinding surface. The annular grinding body is positioned between the left and right end caps. The left and right end caps have insertion slots corresponding to the hollow interior of the annular grinding body. Since the grinding surface of the annular grinding body is prone to wear after long-term use, when the annular grinding body needs to be replaced due to wear, the user can open the left or right end cap to remove the annular grinding body from the tube body for replacement, making the replacement operation convenient. The annular grinding body in this design is relatively large, suitable for grinding large-sized tubes. In addition, a limiting component is provided inside the tube body to restrict the rotation of the annular grinding body relative to the tube body, ensuring that the annular grinding body rotates along with the tube body while grinding the tube.

[0007] Furthermore, the aforementioned limiting component is a limiting protrusion located inside the tube body. The side wall of the annular grinding body is provided with a limiting notch that extends through both ends of the protrusion. The limiting protrusion is placed inside the limiting notch, thereby preventing the annular grinding body from rotating relative to the tube body, allowing the annular grinding body and the tube body to rotate synchronously. The limiting notch is designed to extend through both ends of the annular grinding body, allowing the annular grinding body to move left and right and exit the tube body without affecting the replacement operation of the annular grinding body.

[0008] Furthermore, the aforementioned left and right end caps are threaded to the corresponding ends inside the tube body, ensuring the stability of the connection between the left and right end caps and the tube body, and facilitating easy assembly and disassembly. The outer surfaces of the left and right end caps are axially symmetrically provided with several screw-on ports. When in use, the prongs of the screw-on tool can be inserted into the screw-on ports, which makes it easy to rotate the left and right end caps to open and close.

[0009] Furthermore, the aforementioned tube body has a first sleeve, with a limiting notch on the outer side of the first sleeve. The limiting notch of the first sleeve engages with the limiting protrusion of the tube body, and a limiting protrusion is also provided on the inner side of the first sleeve. An annular grinding body is placed inside the first sleeve, with the limiting notch of the annular grinding body engaging with the limiting protrusion of the first sleeve, thereby causing the annular grinding body and the first sleeve to rotate together with the tube body. The annular grinding body of this design has a moderate size and is used for grinding medium-sized tubes.

[0010] Furthermore, the first sleeve has a second sleeve inside, and the outer side of the second sleeve is provided with a limiting notch. The limiting notch of the second sleeve is matched with the limiting protrusion of the first sleeve, and the inner side of the second sleeve is provided with a limiting protrusion. The annular grinding body is placed inside the second sleeve, and the limiting notch of the annular grinding body is matched with the limiting protrusion of the second sleeve, so that the annular grinding body, the first sleeve, and the second sleeve will rotate together with the pipe body. The annular grinding body of this solution is relatively small in size and is used to grind smaller pipes.

[0011] Furthermore, the aforementioned outer casing includes a hollow vertical tube and a hollow horizontal tube perpendicular to the vertical tube. The interiors of the vertical and horizontal tubes are interconnected. The rotating shaft is rotatably connected inside the vertical tube, and the tube body is rotatably connected inside the horizontal tube. The drive gear is located inside the horizontal tube. This allows the transmission connection of the rotating shaft and the opening of the grinding tube to face different directions, ensuring that the working position of the electric drill does not interfere with the insertion of the tube, thus facilitating operation.

[0012] Furthermore, a left bearing and a right bearing are provided between the outer side of the tube body and the inner side of the horizontal tube, which can reduce the friction between the tube body and the horizontal tube and make the rotation of the tube body smoother.

[0013] Furthermore, a first limiting ring is provided on the outer side of the aforementioned tube body. The left bearing is located between the left end cap and the first limiting ring, so that the left end cap and the first limiting ring can prevent the left bearing from moving left and right relative to the tube body. The right bearing is located between the toothed ring and the right end cap, so that the toothed ring and the right end cap can prevent the right bearing from moving left and right relative to the tube body, thereby improving the installation stability of the two bearings. In addition, a retaining edge is provided on the inner side of the aforementioned horizontal tube corresponding to the right side of the right bearing. The retaining edge can prevent the grinding tube from moving to the right and dislodging from the horizontal tube. A second limiting ring is fastened on the inner side of the horizontal tube corresponding to the left side of the left bearing. The second limiting ring can prevent the grinding tube from moving to the left and dislodging from the horizontal tube, ensuring the installation stability of the grinding tube. After removing the second limiting ring, the grinding tube can be moved to the left and dislodged from the horizontal tube, facilitating the disassembly and assembly of the grinding tube.

[0014] Furthermore, the upper end cover with a hollow structure is detachably connected to the inner opening of the aforementioned vertical tube. The rotating shaft passes through the upper end cover via a bushing. The transmission connection part is a transmission connection groove with a non-circular cross-section, located on the outer end face of the rotating shaft. The upper end cover has a clearance opening corresponding to the transmission connection groove of the rotating shaft. One end of the transmission connecting rod passes through the clearance opening and engages with the transmission connection groove of the rotating shaft. The other end of the transmission connecting rod is connected to an electric drill, which can quickly enable the electric drill to drive the rotating shaft to rotate. In addition, by installing the rotating shaft inside the upper end cover, the rotating shaft can be easily disassembled from the upper end cover when the upper end cover is removed, making disassembly and assembly convenient. The bushing can reduce the friction between the rotating shaft and the upper end cover, making the rotation of the rotating shaft smoother.

[0015] Furthermore, the inner surface of the aforementioned annular grinding body has multiple grinding columns, the free ends of which together form a grinding surface. The grinding function is achieved by the friction between the free ends of the grinding columns and the surface of the pipe during rotation, through the dense distribution of multiple grinding columns.

[0016] This utility model of pipe grinder allows operators to perform circumferential grinding on the pipe surface without rotating the pipe during the grinding process. Compared with existing methods that require rotating the pipe for grinding, this utility model of pipe grinder is more convenient to operate, more efficient, and provides more uniform grinding on the pipe surface. In addition, when the annular grinding body is worn, it can be easily replaced by unscrewing the left or right end cap, making the replacement operation very convenient. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the pipe grinder according to an embodiment of the present invention.

[0018] Figure 2 This is a cross-sectional view of the pipe grinder according to an embodiment of the present invention.

[0019] Figure 3 This is an exploded structural diagram of the pipe grinder according to an embodiment of the present invention.

[0020] Figure 4 This is an enlarged view of part A in section 3.

[0021] Figure 5 This is a schematic diagram of the exploded structure of the grinding tube in the second embodiment of this utility model.

[0022] Figure 6 This is a schematic diagram of the exploded structure of the grinding tube in the third embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram illustrating the use of the pipe grinder according to an embodiment of the present invention. Detailed Implementation

[0024] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0025] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0026] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0027] Example 1

[0028] like Figure 1 , 2 As shown in Figure 3, this embodiment provides a pipe grinder, including a housing 1, a grinding tube 2 rotatably connected inside the housing 1, and a rotating shaft 3. The rotating shaft 3 is connected to the grinding tube 2 in a transmission manner. Rotating the rotating shaft 3 will drive the grinding tube 2 to rotate. The inner side of the grinding tube 2 is a grinding surface. The outer end face of the rotating shaft 3 is provided with a transmission connection part 30 corresponding to its axial position and connected to an external rotating device. Both ends of the grinding tube 2 are exposed outside the housing 1, that is, the housing 1 does not cover the two ends of the grinding tube 2, which facilitates the insertion of the pipe into the grinding tube 2.

[0029] Specifically, the inner end of the aforementioned rotating shaft 3 is provided with a drive gear 31, which is aligned with the center line of the rotating shaft 3. A gear ring 4 is fixedly installed on the outer side of the grinding tube 2, which is aligned with the center line of the grinding tube 2. The teeth of the drive gear 31 mesh with the teeth of the gear ring 4. When the rotating shaft 3 rotates, the drive gear 31 will also rotate. The rotation of the drive gear 31 will transmit power to the gear ring 4, which will drive the grinding tube 2 to rotate, thereby realizing the structural function of the aforementioned drive connection between the rotating shaft 3 and the grinding tube 2.

[0030] The aforementioned grinding tube 2 includes a tube body 21 rotatably connected to the outer casing 1, an annular grinding body 22 placed inside the tube body 21, a left end cap 23 located at the left end of the tube body 21, and a right end cap 24 located at the right end of the tube body 21. A toothed ring 4 is fixedly installed on the outside of the tube body 21. The inner surface of the annular grinding body 22 is the grinding surface. The annular grinding body 22 is placed between the left end cap 23 and the right end cap 24. The left end cap 23 and the right end cap 24 have insertion ports 230 corresponding to the hollow interior of the annular grinding body 22, ensuring that the tube to be ground can be inserted into the annular grinding body 22 through the insertion ports 230. Since the grinding surface of the annular grinding body 22 is prone to wear after long-term use, when the annular grinding body 22 needs to be replaced after wear, the user can open the left end cap or the right end cap to remove the annular grinding body 22 from the tube body 21 for replacement, making the replacement operation convenient. In addition, the inner side of the tube 21 is provided with a limiting member that can restrict the rotation of the annular grinding body 22 relative to the tube 21, so as to ensure that the annular grinding body 22 will also rotate and grind the tube while the tube 21 rotates.

[0031] When using the pipe grinder of this embodiment, the pipe to be ground can be inserted into the annular grinding body 22. Then, an external rotating device such as an electric drill is used to drive the transmission connection part 30. The electric drill is then started, which drives the rotating shaft 3 and the drive gear 31 to rotate. The drive gear 31 then drives the gear ring 4 to rotate the pipe body 21 and the annular grinding body 22. This allows the grinding surface inside the annular grinding body 22 to grind the surface of the pipe. After grinding is completed, the electric drill is turned off, and the ground pipe is taken out from the annular grinding body 22, thus completing the grinding operation on the surface of the pipe.

[0032] Because the inner side of the annular grinding body 22 matches the outer side of the pipe, the pipe grinder in this embodiment does not require the operator to rotate the pipe during the grinding process. The annular grinding body 22 can also perform circumferential grinding on the pipe surface, making it easy to operate, highly efficient, and more uniformly grinding the pipe surface.

[0033] Example 2

[0034] This embodiment is a further improvement on the structure of the pipe grinder in Embodiment 1. The improvement lies in that, as... Figure 3As shown, the aforementioned limiting member is a limiting protrusion 211 located inside the tube 21. The limiting protrusion 211 is formed by a screw passing through the outside of the tube 21 and into the inside of the tube 21. The side wall of the annular grinding body 22 is provided with a limiting notch 221 that extends through both ends. The limiting protrusion 211 is placed inside the limiting notch 221, thereby preventing the annular grinding body 22 from rotating relative to the tube 21, so that the annular grinding body 22 and the tube 21 can rotate synchronously. The limiting notch 221 is designed to extend through both ends of the annular grinding body 22, so that the annular grinding body 22 can move left and right to exit the tube 21 without affecting the replacement operation of the annular grinding body 22.

[0035] like Figure 1 As shown, the left end cap 23 and the right end cap 24 are threaded to the corresponding ends inside the tube body 21, ensuring the stability of the connection between the left end cap 23 and the right end cap 24 and the tube body 21, and making disassembly and assembly convenient. The left end cap 23 and the right end cap 24 are axially symmetrically provided with several screw cap openings 231 on their outer surfaces. When in use, the prongs of the screw cap tool can be inserted into the screw cap openings 231, so that the left end cap 23 and the right end cap 24 can be easily rotated to open and close.

[0036] like Figure 3 , 4 As shown, the aforementioned annular grinding body 22 includes a base plate and multiple grinding pillars 222. The grinding pillars 222 are densely distributed on the same side of the base plate. The base plate is formed by rolling a plastic plate to form a cylinder with gaps in the side wall and placed inside the tube body 21. The gaps in the side wall of the cylinder form a limiting notch 221. All the grinding pillars 222 are located on the inner side of the base plate, so that the inner side of the annular grinding body 22 is formed by the free ends of multiple grinding pillars 222. Through the dense distribution of multiple grinding pillars 222, the grinding function is achieved by the free ends of the grinding pillars 222 rubbing against the surface of the tube during rotation.

[0037] In addition, the grinding tube 2 in this embodiment provides three size options, as follows:

[0038] The first type of grinding tube 2-size scheme is as follows: Figure 3 As shown, an annular grinding body 22 is directly set inside the tube body 21. The annular grinding body 22 in this scheme is relatively large and is used to grind large-sized tubes.

[0039] The second type of grinding tube 2-size scheme is as follows: Figure 5As shown, a first sleeve 27 is added to the inner side of the tube body 21. A limiting notch 221 is provided on the outer side of the first sleeve 27. The limiting notch 221 of the first sleeve 27 cooperates with the limiting protrusion 211 of the tube body 21. A limiting protrusion 211 is also provided on the inner side of the first sleeve 27. The annular grinding body 22 is placed inside the first sleeve 27. The limiting notch 221 of the annular grinding body 22 cooperates with the limiting protrusion 211 of the first sleeve 27, so that the annular grinding body 22 and the first sleeve 27 will rotate together with the tube body 21. The annular grinding body 22 of this scheme is of moderate size and is used for grinding medium-sized tubes.

[0040] The third option, the 2-size grinding tube, is as follows: Figure 6 As shown, a second sleeve 28 is added inside the first sleeve 27. The outer side of the second sleeve 28 is also provided with a limiting notch 221. The limiting notch 221 of the second sleeve 28 cooperates with the limiting protrusion 211 of the first sleeve 27. The inner side of the second sleeve 28 is also provided with a limiting protrusion 211. The annular grinding body 22 is placed inside the second sleeve 28. The limiting notch 221 of the annular grinding body 22 cooperates with the limiting protrusion 211 of the second sleeve 28, so that the annular grinding body 22, the first sleeve 27, and the second sleeve 28 will rotate together with the tube body 21. The annular grinding body 22 of this scheme is relatively small and is used to grind smaller tubes.

[0041] This embodiment provides three size options for the grinding tube 2, allowing users to select the appropriate size option based on the required tube size, thus providing greater operational flexibility. Of course, in addition to the three options mentioned above, users can further add a sleeve structure within the second sleeve 28, thereby making the size of the annular grinding body 22 smaller for grinding even smaller tubes.

[0042] To improve the stability of the grinder, the dimensions of the insertion ports 230 of the left end cap 23 and right end cap 24 of the aforementioned grinding tube 2 are adapted to the dimensions of the annular grinding body 22 as closely as possible.

[0043] Example 3

[0044] This embodiment is a further improvement on the pipe grinder structure of Embodiment 2. The improvement lies in, for example... Figure 1 , 2As shown in Figure 3, the outer casing 1 includes a hollow vertical tube 11 and a hollow horizontal tube 12 perpendicular to the vertical tube 11. The interiors of the vertical tube 11 and the horizontal tube 12 are interconnected. The rotating shaft 3 is rotatably connected inside the vertical tube 11, and the tube body 21 is rotatably connected inside the horizontal tube 12. The drive gear 31 is placed inside the horizontal tube 12. This allows the transmission connection part 30 of the rotating shaft 3 and the opening of the grinding tube 2 to face different directions, so that the working position of the electric drill will not interfere with the insertion of the tube, facilitating operation. A left bearing 25 and a right bearing 26 are provided between the outer side of the tube body 21 and the inner side of the horizontal tube 12, which can reduce the friction between the tube body 21 and the horizontal tube 12, making the rotation of the tube body 21 smoother.

[0045] The outer side of the tube body 21 is provided with a first limiting ring 212. The left bearing 25 is located between the left end cover 23 and the first limiting ring 212, so that the left end cover 25 and the first limiting ring 212 can prevent the left bearing 25 from moving left and right relative to the tube body 21. The right bearing 26 is located between the toothed ring 4 and the right end cover 24, so that the toothed ring 4 and the right end cover 24 can prevent the right bearing 26 from moving left and right relative to the tube body 21, thereby improving the installation stability of the two bearings. In addition, a retaining edge 121 is provided on the inner side of the horizontal tube 12 corresponding to the right side of the right bearing 26. The retaining edge 121 can prevent the grinding tube 2 from moving to the right and getting out of the horizontal tube 12. A second limiting ring 122 is fastened on the inner side of the horizontal tube 12 corresponding to the left side of the left bearing 25. The second limiting ring 122 can prevent the grinding tube 2 from moving to the left and getting out of the horizontal tube 12, ensuring the installation stability of the grinding tube 2. After the second limiting ring 122 is removed, the grinding tube 2 can be moved to the left and get out of the horizontal tube 12, which facilitates the disassembly and assembly of the grinding tube 2.

[0046] A hollow upper cover 111 is detachably connected to the inner opening of the aforementioned vertical tube 11. The upper cover 111 is connected to the vertical tube 11 by a bolt 6 to facilitate the installation and removal of the upper cover 111. Furthermore, by installing the rotating shaft 3 inside the upper cover 111, the rotating shaft 3 can be easily removed from the upper cover 111 when the upper cover 111 is disassembled, thus facilitating the installation and removal of the rotating shaft 3. The aforementioned rotating shaft 3 passes through the upper cover 111 via a bushing 32. The bushing 32 reduces friction between the rotating shaft 3 and the upper cover 111, resulting in smoother rotation of the rotating shaft 3.

[0047] The aforementioned transmission connection part 30 is a transmission connection groove opened on the outer end face of the rotating shaft 3 corresponding to its axial center position. The cross-section of the transmission connection groove is non-circular, for example, polygonal. The upper end cover 111 has a clearance opening 110 corresponding to the position of the transmission connection groove of the rotating shaft 3. Figure 7 As shown, in use, the lower end of the transmission link 5 passes through the clearance opening 110 and engages with the transmission connection groove of the rotating shaft 3, and the upper end of the transmission link 5 is connected to the electric drill, so that the electric drill can quickly drive the rotating shaft 3 to rotate.

[0048] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pipe grinder, characterized in that: The device includes a housing (1), a grinding tube (2) rotatably connected inside the housing (1), and a rotating shaft (3). The inner side of the grinding tube (2) is a grinding surface. The outer end of the rotating shaft (3) is provided with a transmission connection part (30) connected to an external rotating device. The inner end of the rotating shaft (3) is provided with a drive gear (31). A gear ring (4) is fixedly installed on the outer side of the grinding tube (2). The teeth of the drive gear (31) mesh with the teeth of the gear ring (4). Both ends of the grinding tube (2) are exposed outside the housing (1).

2. The pipe grinder according to claim 1, characterized in that: The grinding tube (2) includes a tube body (21) rotatably connected to the outer shell (1), an annular grinding body (22) placed inside the tube body (21), a left end cap (23) located at the left end of the tube body (21), and a right end cap (24) located at the right end of the tube body (21). A toothed ring (4) is fixedly installed on the outside of the tube body (21). The inner surface of the annular grinding body (22) is a grinding surface. The annular grinding body (22) is placed between the left end cap (23) and the right end cap (24). The left end cap (23) and the right end cap (24) have insertion ports (230) corresponding to the hollow interior of the annular grinding body (22). The inner side of the tube body (21) is provided with a limiting member that can restrict the rotation of the annular grinding body (22) relative to the tube body (21).

3. The pipe grinder according to claim 2, characterized in that: The limiting component is a limiting protrusion (211) located inside the tube body (21), and the side wall of the annular grinding body (22) is provided with a limiting notch (221) that extends through both ends, with the limiting protrusion (211) placed inside the limiting notch (221).

4. The pipe grinder according to claim 3, characterized in that: The left end cap (23) and the right end cap (24) are both threaded to the inside of the tube body (21), and the outer surfaces of the left end cap (23) and the right end cap (24) are axially symmetrically provided with several screw cap openings (231).

5. The pipe grinder according to claim 3, characterized in that: The tube body (21) has a first sleeve (27) inside. The first sleeve (27) has a limiting notch (221) on the outside. The limiting notch (221) of the first sleeve (27) is matched with the limiting protrusion (211) of the tube body (21). The first sleeve (27) also has a limiting protrusion (211) on the inside. The annular grinding body (22) is placed inside the first sleeve (27). The limiting notch (221) of the annular grinding body (22) is matched with the limiting protrusion (211) of the first sleeve (27).

6. The pipe grinder according to claim 5, characterized in that: The first sleeve (27) has a second sleeve (28) inside. The second sleeve (28) has a limiting notch (221) on its outer side. The limiting notch (221) of the second sleeve (28) cooperates with the limiting protrusion (211) of the first sleeve (27). The second sleeve (28) has a limiting protrusion (211) on its inner side. The annular grinding body (22) is placed inside the second sleeve (28). The limiting notch (221) of the annular grinding body (22) cooperates with the limiting protrusion (211) of the second sleeve (28).

7. The pipe grinder according to any one of claims 2-6, characterized in that: The outer shell (1) includes a hollow vertical tube (11) and a hollow horizontal tube (12) arranged perpendicularly to the vertical tube (11). The interiors of the vertical tube (11) and the horizontal tube (12) are interconnected. A rotating shaft (3) is rotatably connected inside the vertical tube (11), and a tube body (21) is rotatably connected inside the horizontal tube (12). A drive gear (31) is placed inside the horizontal tube (12).

8. The pipe grinder according to claim 7, characterized in that: A left bearing (25) and a right bearing (26) are provided between the outer side of the tube body (21) and the inner side of the horizontal tube (12). A first limiting ring (212) is provided on the outer side of the tube body (21). The left bearing (25) is located between the left end cap (23) and the first limiting ring (212). The right bearing (26) is located between the toothed ring (4) and the right end cap (24). A retaining edge (121) is provided on the inner side of the horizontal tube (12) corresponding to the right side of the right bearing (26). A second limiting ring (122) is fastened on the inner side of the horizontal tube (12) corresponding to the left side of the left bearing (25).

9. The pipe grinder according to claim 7, characterized in that: The upper end cover (111) with a hollow structure is detachably connected to the inner opening of the vertical tube (11). The rotating shaft (3) passes through the upper end cover (111) through the bushing (32). The transmission connection part (30) is a transmission connection groove with a non-circular cross-section. The transmission connection groove is located on the outer end face of the rotating shaft (3). The upper end cover (111) has a clearance opening (110) corresponding to the transmission connection groove position of the rotating shaft (3).

10. The pipe grinder according to claim 7, characterized in that: The inner surface of the annular grinding body has multiple grinding columns (222), and the free ends of the multiple grinding columns (222) together form a grinding surface.

Images