A stainless steel tube inner polishing device

Abstract

The utility model discloses a stainless steel pipe inner polishing device, including main connection shell and fixed installation on the main connection shell's main grip lever and install the grip lever of auxiliary grip lever's composition, still include installation on the main connection shell's rotation drive subassembly and adjusting drive subassembly, install the connecting assembly of grip lever, rotate and connect on the main connection shell's rotation axle sleeve, the first sliding block of sliding connection on rotation axle sleeve, fixed installation on the first sliding block's fixed shell, install the clamping assembly of fixed shell, install the polishing roller subassembly of fixed shell, rotation axle sleeve connects on the output of rotation drive subassembly. According to the size of the pipe material to be polished, by setting adjusting drive subassembly, drive the movement of first sliding block, adjust the interval of polishing roller subassembly, until the polishing roller body in polishing roller subassembly and the inner wall of stainless steel pipe to be polished are adapted, satisfy the polishing demand of different size pipe material.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe production technology, specifically to a stainless steel pipe internal polishing device. Background Technology

[0002] In the industrial production field, stainless steel pipes are widely used, from chemical pipelines to building decoration pipes. Their quality and surface finish directly affect the performance and aesthetics of the products. Therefore, polishing the inner wall of stainless steel pipes has become an indispensable key link in the production process.

[0003] In the current technology, faced with a wide variety of stainless steel pipe specifications on the market, the size and inner wall shape of different pipes vary greatly. Traditional fixed polishing devices lack flexibility in design, and the size and shape of their polishing heads are fixed, making it difficult to adapt to diverse pipe requirements. When encountering pipes of different diameters, operators have to frequently change polishing heads. This process is not only time-consuming and labor-intensive, but also greatly increases production costs and operational difficulty, seriously affecting the overall operating efficiency of the production line. Utility Model Content

[0004] The purpose of this utility model is to provide a stainless steel pipe internal polishing device to solve the problems mentioned in the background art, such as the fixed size and shape of the polishing head of the traditional stainless steel pipe polishing device, which is difficult to adapt to pipes with different diameters and inner wall shapes, requires frequent replacement of polishing heads, which is time-consuming, labor-intensive, increases costs and operational difficulty, and drags down production efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a stainless steel tube internal polishing device, comprising a main connecting shell and a grip consisting of a main grip fixedly mounted on the main connecting shell and a secondary grip mounted on the main grip, further comprising a rotation drive assembly and an adjustment drive assembly mounted on the main connecting shell, a connecting assembly mounted on the grip, a rotation sleeve rotatably connected to the main connecting shell, a first sliding block slidably connected to the rotation sleeve, a fixed outer shell fixedly mounted on the first sliding block, a snap-fit ​​assembly mounted on the fixed outer shell, and a polishing roller assembly mounted on the fixed outer shell, wherein the rotation sleeve is connected to the output end of the rotation drive assembly, and the first sliding block is connected to the output end of the adjustment drive assembly; The adjustment drive assembly is used to adjust the opening and closing of the first sliding block. After the polishing roller assembly is installed on the fixed housing, the polishing roller assembly is limited and fixed by the snap-fit ​​assembly. In use, the rotating drive assembly drives the rotating bushing to rotate, which in turn drives the polishing roller assembly to polish the inside of the pipe.

[0006] According to the preferred embodiment of this technical solution, the rotation drive assembly includes a first motor fixedly mounted on the main connecting shell, a rotating gear fixedly connected to the output end of the first motor, and a connecting gear meshing with the rotating gear. The connecting gear is fixedly connected to the rotating shaft sleeve. The first motor is used to drive the rotating gear to rotate. When the rotating gear rotates, it drives the rotating shaft sleeve to rotate through meshing with the connecting gear.

[0007] According to the preferred embodiment of this technical solution, the adjustment drive assembly includes an electric push rod body fixedly mounted on the main connecting shell, a sliding seat slidably connected to the rotating shaft sleeve, and a rotating rod rotatably connected between the first sliding block and the sliding seat. The sliding seat is rotatably connected to the output end of the electric push rod body. The electric push rod body is used to push the sliding seat to move in a preset direction. When the sliding seat moves, it pushes the rotating rod to drive the first sliding block to move in the preset direction.

[0008] In a preferred embodiment of this technical solution, a rotating groove is provided on the sliding seat, and the sliding seat is rotatably connected to the output end of the electric push rod body through the rotating groove.

[0009] In a preferred embodiment of this technical solution, the snap-fit ​​assembly includes an adjusting threaded rod rotatably connected to a fixed housing, a linkage plate threadedly connected to the adjusting threaded rod, a second sliding block slidably connected to the fixed housing, a fixed plate fixedly connected to the second sliding block, and a first limiting block fixedly mounted on the fixed plate. The linkage plate is slidably connected to the second sliding block. The adjusting threaded rod is used to drive the linkage plate to move in a preset direction. When the linkage plate moves, it drives the connected second sliding block to move in the preset direction. When the second sliding block moves, it drives the first limiting block to open or move closer.

[0010] According to the preferred embodiment of this technical solution, the polishing roller assembly includes a mounting base mounted on a fixed housing and a polishing roller body fixedly connected to the mounting base, with a first limiting block snapped into the mounting base.

[0011] In a preferred embodiment of this technical solution, the connecting component includes a second limiting block and a third sliding plate slidably connected to the grip, a connecting block fixedly connected to the second limiting block, a first spring fixedly connected between the third sliding plate and the grip, a fixed rod fixedly connected to the third sliding plate, and a linkage rod fixedly connected to the fixed rod. The second limiting block is snapped onto the auxiliary grip, the linkage rod is slidably connected to the connecting block, and the third sliding plate is used to drive the fixed rod to move in a preset direction. When the fixed rod moves, it drives the second limiting block to move in the preset direction through the transmission cooperation between the linkage rod and the connecting block.

[0012] In a preferred embodiment of this technical solution, the connecting block is provided with a connecting groove that matches the linkage rod, and the linkage rod is slidably connected to the connecting groove.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. Based on the size of the pipe to be polished, the first sliding block is moved by setting an adjustment drive component to adjust the spacing of the polishing roller assembly until the polishing roller body in the polishing roller assembly is adapted to the inner wall of the stainless steel pipe to be polished, so as to meet the polishing requirements of pipes of different sizes.

[0014] 2. The polishing roller assembly adopts a modular design and is installed on the fixed housing through snap-fit ​​components. During use, the polishing roller assembly at different positions can be flexibly replaced according to the wear degree of the polishing roller assembly at different positions, avoiding the need for complete replacement, effectively reducing replacement costs and operational difficulty, and improving the economy and convenience of using the device.

[0015] 3. The auxiliary handle adopts a modular design. During use, the required number of auxiliary handles can be flexibly added according to the length of the pipe to be polished. During the addition process, quick assembly can be achieved with the help of the connecting components installed on the handle. Compared with the traditional threaded or bolt connection method, no tools are needed for turning, making the assembly process faster and more convenient, greatly shortening the handle adjustment time, and further improving the flexibility and operating efficiency of the device to adapt to pipes of different lengths. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one embodiment of the stainless steel tube internal polishing device of this utility model; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the central connecting shell; Figure 3 This is a schematic diagram of the snap-fit ​​assembly and polishing roller assembly of this utility model; Figure 4 This is a schematic diagram of the connecting component structure of this utility model; Figure 5 This is a schematic diagram of the second limiting block and its connected components of the present invention.

[0017] In the diagram: 1. Main connecting shell; 4. Main grip rod; 5. Secondary grip rod; 21. Rotating bushing; 22. First sliding block; 23. Fixed shell; 24. First motor; 25. Rotating gear; 26. Connecting gear; 27. Electric push rod body; 28. Sliding seat; 29. ​​Rotating rod; 210. Adjusting threaded rod; 211. Second sliding block; 212. Linkage plate; 213. Fixed plate; 214. First limit block; 215. Mounting seat; 216. Polishing roller body; 31. Second limit block; 32. Connecting block; 33. Third sliding plate; 34. First spring; 35. Fixed rod; 36. Linkage rod. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1 - Figure 5 This utility model provides an embodiment: a stainless steel tube internal polishing device, including a main connecting shell 1 and a grip consisting of a main grip 4 fixedly installed on the main connecting shell 1 and a secondary grip 5 installed on the main grip 4. It also includes a rotation drive assembly and an adjustment drive assembly installed on the main connecting shell 1, a connecting assembly installed on the grip, a rotation sleeve 21 rotatably connected to the main connecting shell 1, a first sliding block 22 slidably connected to the rotation sleeve 21, a fixed outer shell 23 fixedly installed on the first sliding block 22, a snap-fit ​​assembly installed on the fixed outer shell 23, and a polishing roller assembly installed on the fixed outer shell 23. The rotation sleeve 21 is connected to the output end of the rotation drive assembly, and the first sliding block 22 is connected to the output end of the adjustment drive assembly. The adjustment drive assembly is used to adjust the opening and closing of the first sliding block 22. After the polishing roller assembly is installed on the fixed housing 23, the polishing roller assembly is limited and fixed by the snap-fit ​​assembly. In use, the rotating drive assembly drives the rotating bushing 21 to rotate, which in turn drives the polishing roller assembly to polish the inside of the pipe. When using this stainless steel pipe polishing device, first install the polishing roller assembly onto the fixed housing 23, and use the snap-fit ​​assembly to limit and fix the polishing roller assembly to ensure that the polishing roller assembly remains stable in subsequent work. Then, according to the pipe diameter of the stainless steel pipe to be polished, start the adjustment drive assembly. The adjustment drive assembly will drive the first sliding block 22 to move. Since the first sliding block 22 is fixedly connected to the fixed housing 23, the movement of the first sliding block 22 will synchronously drive the fixed housing 23 and the polishing roller assembly installed on the fixed housing 23 to move until the position of the polishing roller assembly is adapted to the inner wall of the pipe. Then, according to the length of the pipe, add the required number of auxiliary grips 5, and use the connecting assembly to assemble and connect the main grip 4 and the auxiliary grips 5 together. Once the polishing roller assembly is in position, the rotation drive assembly is activated. The output end of the rotation drive assembly drives the rotating bushing 21 to rotate. The rotation of the rotating bushing 21 drives the first sliding block 22, the fixed housing 23, and the polishing roller assembly to rotate together. During the rotation of the polishing roller assembly, the operator holds the handle consisting of the main handle 4 and the auxiliary handle 5 and inserts the polishing roller assembly into the pipe. The rotating polishing roller assembly can then contact the inner wall of the pipe to perform polishing work on the inside of the pipe.

[0020] Please see Figure 1 - Figure 3 A further solution based on this embodiment is as follows: The rotation drive assembly includes a first motor 24 fixedly mounted on the main connecting shell 1, a rotating gear 25 fixedly connected to the output end of the first motor 24, and a connecting gear 26 meshing with the rotating gear 25. The connecting gear 26 is fixedly connected to the rotating bushing 21. The first motor 24 is used to drive the rotating gear 25 to rotate. When the rotating gear 25 rotates, it drives the rotating bushing 21 to rotate through meshing with the connecting gear 26. The first motor 24 drives the rotating gear 25 to rotate, and the rotating gear 25 drives the connecting gear 26 and the connected rotating bushing 21 to rotate through meshing. The gear meshing transmission ensures that the rotating bushing 21 drives the polishing roller assembly to polish at a uniform speed, thereby improving the polishing accuracy.

[0021] Please see Figure 1 - Figure 3 A further solution based on this embodiment is as follows: the adjustment drive assembly includes an electric push rod body 27 fixedly installed on the main connecting shell 1, a sliding seat 28 slidably connected to the rotating bushing 21, and a rotating rod 29 rotatably connected between the first sliding block 22 and the sliding seat 28. The sliding seat 28 is rotatably connected to the output end of the electric push rod body 27. The electric push rod body 27 is used to push the sliding seat 28 to move in a preset direction. When the sliding seat 28 moves, it pushes the rotating rod 29 to drive the first sliding block 22 to move in the preset direction. By pushing the sliding seat 28 to move through the electric push rod body 27, the sliding seat 28 pushes the first sliding block 22 to slide along the rotating bushing 21 through the rotating rod 29. The moving distance of the first sliding block 22 can be controlled, realizing fine adjustment of the spacing of the polishing roller assembly, adapting to pipelines with different inner wall shapes, and greatly increasing the adaptability of the device.

[0022] Please see Figure 1 - Figure 3 A further solution based on this embodiment is as follows: a rotating groove is provided on the sliding seat 28, and the sliding seat 28 is rotatably connected to the output end of the electric push rod body 27 through the rotating groove; the sliding seat 28 is rotatably connected to the output end of the electric push rod body 27 through the rotating groove, and the angle is adaptively adjusted as the electric push rod extends and retracts, so as to avoid the sliding seat 28 from disengaging from the electric push rod body 27 when it moves and rotates, which would affect the subsequent adjustment of the polishing roller assembly.

[0023] Please see Figure 1 - Figure 3A further solution based on this embodiment is as follows: The snap-fit ​​assembly includes an adjusting threaded rod 210 rotatably connected to the fixed housing 23, a linkage plate 212 threadedly connected to the adjusting threaded rod 210, a second sliding block 211 slidably connected to the fixed housing 23, a fixed plate 213 fixedly connected to the second sliding block 211, and a first limiting block 214 fixedly installed on the fixed plate 213. The linkage plate 212 is slidably connected to the second sliding block 211. The adjusting threaded rod 210 is used to drive the linkage plate 212 to move in a preset direction. When the linkage plate 212 moves, it drives the connected second sliding block 211 to move in the preset direction. When the second sliding block 211 moves, it drives the first limiting block 214 to open or move closer. Rotating the adjusting threaded rod 210 drives the linkage plate 212 to move. The linkage plate 212 drives the second sliding block 211 to move, so that the first limiting block 214 on the fixed plate 213 opens and closes. The displacement of the first limiting block 214 is achieved by threaded transmission, which facilitates the disassembly and maintenance of the polishing roller assembly.

[0024] Please see Figure 1 - Figure 3 A further solution based on this embodiment is as follows: the polishing roller assembly includes a mounting base 215 mounted on the fixed housing 23 and a polishing roller body 216 fixedly connected to the mounting base 215. A first limiting block 214 is snapped onto the mounting base 215. After the first limiting block 214 is snapped onto the mounting base 215, the polishing roller body 216 is fixed on the fixed housing 23. During operation, the polishing roller body 216 rotates with the fixed housing 23 and the rotating bushing 21 to achieve polishing. The snapping structure is simple and reliable, which facilitates the quick assembly and disassembly of the polishing roller body 216 and reduces the difficulty of maintenance. Moreover, the polishing roller body 216 adopts a modular design. When one side of the polishing roller body 216 is worn and needs to be replaced, it can be replaced separately.

[0025] Please see Figure 1 - Figure 5A further embodiment of this solution is as follows: the connecting assembly includes a second limiting block 31 and a third sliding plate 33 slidably connected to the grip bar, a connecting block 32 fixedly connected to the second limiting block 31, a first spring 34 fixedly connected between the third sliding plate 33 and the grip bar, a fixing rod 35 fixedly connected to the third sliding plate 33, and a linkage rod 36 fixedly connected to the fixing rod 35. The second limiting block 31 is engaged with the auxiliary grip bar 5, the linkage rod 36 is slidably connected to the connecting block 32, and the third sliding plate 33 is used to drive the fixing rod 35 to move along a preset direction. When the fixing rod 35 moves, it is connected to the linkage rod. The 36 and the connecting block 32 work together to drive the second limiting block 31 to move in a preset direction; the movement of the third sliding plate 33 drives the fixed rod 35 and the linkage rod 36 to move. The linkage rod 36 drives the second limiting block 31 to open and close through the connecting block 32. The first spring 34 assists the third sliding plate 33 to reset. The spring reset structure realizes the automatic rebound of the second limiting block 31, which simplifies the operation steps and enhances the stability of the connection between the auxiliary grip rod 5 and the main grip rod 4. The auxiliary grip rod 5 adopts a modular design. When in use, the required number of auxiliary grip rods 5 can be added according to the length of the pipeline. Its snap-fit ​​structure design makes assembly more convenient and faster.

[0026] Please see Figure 1 - Figure 5 A further solution based on this embodiment is as follows: a connecting groove adapted to the linkage rod 36 is provided on the connecting block 32, and the linkage rod 36 is slidably connected to the connecting groove; the linkage rod 36 slides along the connecting groove of the connecting block 32, and the groove guides the precise transmission and cooperation with the connecting block 32. The connecting groove provides a guiding function to prevent the linkage rod 36 from deviating during transmission. The linear sliding of the fixed rod 35 and the linkage rod 36 is transformed into the up and down movement of the second limiting block 31 through the sliding groove of the connecting block 32, which drives the second limiting block 31 to move away from and closer to the slot of the auxiliary grip rod 5.

[0027] Other embodiments: The adjustment drive assembly can also adopt other structures in the prior art, with a pneumatic push rod replacing the electric push rod body 27. The advantage is that the pneumatic push rod is suitable for outdoor or temporary polishing scenarios without power supply, and the pneumatic push rod has a faster response speed, which is suitable for high-frequency adjustment needs.

[0028] Working principle: When using this stainless steel tube polishing device, first install the mounting base 215 in the polishing roller assembly onto the fixed housing 23. Then operate the adjusting threaded rod 210 in the snap-fit ​​assembly. When the adjusting threaded rod 210 rotates, it drives the linkage plate 212 connected to it to move along the preset direction. During the movement of the linkage plate 212, it cooperates with the second sliding block 211, driving the second sliding block 211 to slide along the fixed housing 23. When the second sliding block 211 slides, it drives the fixed plate 213 and the first limiting block 214 fixed on the fixed plate 213 to move, so that the first limiting block 214 approaches and snaps onto the mounting base 215, thereby limiting and fixing the polishing roller assembly. After the polishing roller assembly is fixed, according to the diameter of the stainless steel pipe to be polished, the electric push rod body 27 in the adjustment drive assembly is activated. The electric push rod body 27 pushes the sliding seat 28 to move along the rotating shaft sleeve 21. When the sliding seat 28 moves, it cooperates with the rotating rod 29. During the rotation of the rotating rod 29, it drives the first sliding block 22 to slide along the rotating shaft sleeve 21. Since the first sliding block 22 is connected to the fixed housing 23, when the first sliding block 22 slides, it drives the fixed housing 23 and the polishing roller assembly installed on the fixed housing 23 to move together until the polishing roller body 27 in the polishing roller assembly moves along with the stainless steel pipe to the diameter of the pipe. 16 is adapted to the inner wall of the pipe. If the length of the pipe to be polished is long, the required number of auxiliary grips 5 can be added according to the length of the pipe. When operating the connecting assembly, push the third sliding plate 33 to move along the grip. When the third sliding plate 33 moves, it drives the fixed rod 35 to move synchronously. During the movement of the fixed rod 35, it cooperates with the linkage rod 36, so that the linkage rod 36 slides along the connecting groove on the connecting block 32. When the linkage rod 36 slides, it cooperates with the connecting block 32, driving the second limit block 31 to move along the grip and locking the second limit block 31 onto the auxiliary grip 5, thus realizing the assembly and connection of the main grip 4 and the auxiliary grip 5. Once the polishing roller assembly is positioned correctly and the grip is assembled, the first motor 24 in the rotation drive assembly is started. The output of the first motor 24 drives the rotating gear 25 to rotate. During the rotation of the rotating gear 25, it meshes with the connecting gear 26, driving the connecting gear 26 to rotate. Since the connecting gear 26 is connected to the rotating bushing 21, when the connecting gear 26 rotates, it drives the rotating bushing 21 to rotate around the main connecting shell 1. During the rotation of the rotating bushing 21, it cooperates with the first sliding block 22, driving the first sliding block 22, the fixed shell 23, and the polishing roller assembly mounted on the fixed shell 23 to rotate together. When the polishing roller assembly rotates, it drives the polishing roller body 216 to rotate synchronously. At this time, the operator holds the grip consisting of the main grip 4 and the auxiliary grip 5 and inserts the polishing roller assembly of the device into the inside of the pipe. The rotating polishing roller body 216 contacts the inner wall of the pipe and performs polishing operations on the inside of the pipe.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stainless steel tube internal polishing device, comprising a main connecting shell (1) and a grip consisting of a main grip (4) fixedly mounted on the main connecting shell (1) and a secondary grip (5) mounted on the main grip (4), characterized in that: It also includes a rotation drive assembly and an adjustment drive assembly mounted on the main connecting shell (1), a connection assembly mounted on the handle, a rotation bushing (21) rotatably connected to the main connecting shell (1), a first sliding block (22) slidably connected to the rotation bushing (21), a fixed outer shell (23) fixedly mounted on the first sliding block (22), a snap-fit ​​assembly mounted on the fixed outer shell (23), and a polishing roller assembly mounted on the fixed outer shell (23). The rotation bushing (21) is connected to the output end of the rotation drive assembly, and the first sliding block (22) is connected to the output end of the adjustment drive assembly. The adjustment drive assembly is used to adjust the opening and closing of the first sliding block (22). After the polishing roller assembly is installed on the fixed housing (23), the polishing roller assembly is limited and fixed by the snap-fit ​​assembly. When in use, the rotating drive assembly drives the rotating bushing (21) to rotate, thereby rotating the polishing roller assembly to polish the inside of the pipe.

2. The stainless steel tube internal polishing device according to claim 1, characterized in that: The rotation drive assembly includes a first motor (24) fixedly mounted on the main connecting shell (1), a rotating gear (25) fixedly connected to the output end of the first motor (24), and a connecting gear (26) meshing with the rotating gear (25). The connecting gear (26) is fixedly connected to the rotating bushing (21). The first motor (24) is used to drive the rotating gear (25) to rotate. When the rotating gear (25) rotates, it drives the rotating bushing (21) to rotate through meshing with the connecting gear (26).

3. The stainless steel tube internal polishing device according to claim 1, characterized in that: The adjustment drive assembly includes an electric push rod body (27) fixedly mounted on the main connecting shell (1), a sliding seat (28) slidably connected to the rotating bushing (21), and a rotating rod (29) rotatably connected between the first sliding block (22) and the sliding seat (28). The sliding seat (28) is rotatably connected to the output end of the electric push rod body (27). The electric push rod body (27) is used to push the sliding seat (28) to move in a preset direction. When the sliding seat (28) moves, it pushes the rotating rod (29) to drive the first sliding block (22) to move in a preset direction.

4. The stainless steel tube internal polishing device according to claim 3, characterized in that: A rotating groove is provided on the sliding seat (28), and the sliding seat (28) is rotatably connected to the output end of the electric push rod body (27) through the rotating groove.

5. The stainless steel tube internal polishing device according to claim 1, characterized in that: The snap-fit ​​assembly includes an adjusting threaded rod (210) rotatably connected to a fixed housing (23), a linkage plate (212) threadedly connected to the adjusting threaded rod (210), a second sliding block (211) slidably connected to the fixed housing (23), a fixed plate (213) fixedly connected to the second sliding block (211), and a first limiting block (214) fixedly installed on the fixed plate (213). The linkage plate (212) is slidably connected to the second sliding block (211). The adjusting threaded rod (210) is used to drive the linkage plate (212) to move in a preset direction. When the linkage plate (212) moves, it drives the connected second sliding block (211) to move in a preset direction. When the second sliding block (211) moves, it drives the first limiting block (214) to open or approach.

6. The stainless steel tube internal polishing device according to claim 1, characterized in that: The polishing roller assembly includes a mounting base (215) mounted on a fixed housing (23) and a polishing roller body (216) fixedly connected to the mounting base (215), with a first limiting block (214) snapped onto the mounting base (215).

7. The stainless steel tube internal polishing device according to claim 1, characterized in that: The connecting assembly includes a second limiting block (31) and a third sliding plate (33) slidably connected to the grip, a connecting block (32) fixedly connected to the second limiting block (31), a first spring (34) fixedly connected between the third sliding plate (33) and the grip, a fixed rod (35) fixedly connected to the third sliding plate (33), and a linkage rod (36) fixedly connected to the fixed rod (35). The second limiting block (31) is snapped onto the auxiliary grip (5), the linkage rod (36) is slidably connected to the connecting block (32), and the third sliding plate (33) is used to drive the fixed rod (35) to move in a preset direction. When the fixed rod (35) moves, it drives the second limiting block (31) to move in a preset direction through the linkage rod (36) and the connecting block (32).

8. The stainless steel tube internal polishing device according to claim 7, characterized in that: The connecting block (32) has a connecting groove that matches the linkage rod (36), and the linkage rod (36) is slidably connected to the connecting groove.

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