PVC-U drain pipe inner wall polishing device

Abstract

The invention provides a PVC-U drain pipe inner wall polishing device, and relates to the field of drain pipe inner wall polishing. The device comprises a base, and a stop block is fixedly connected to the position, located at the left end, of the upper surface of the base; a through groove used for cleaning powder is formed in the check block. The interior of the drainage pipeline is polished and ground synchronously through cooperation of two grinding assemblies arranged in the polishing and grinding device, meanwhile, dust is blown away through cooperation of a sweeping assembly and a spray head, interference of the powder to grinding is prevented, the grinding effect is enhanced, and the grinding efficiency is improved; the polishing assembly and the cleaning assembly are jacked up to adapt to pipelines with different inner diameters, meanwhile, a polishing plate can be conveniently disassembled through bolts, a positioning assembly is arranged to move a sliding ring so as to drive a moving plate to move, a spray head leaves when the spray head moves into the drainage pipeline, and the error possibility caused by manual operation is reduced; and the polishing efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of polishing the inner wall of drainage pipes, specifically to a polishing device for the inner wall of PVC-U drainage pipes. Background Technology

[0002] PVC-U drainage pipes are widely used plastic pipes in construction and municipal engineering, primarily for sewage discharge, rainwater drainage, and the transmission of other non-potable water. PVC-U, or unplasticized polyvinyl chloride, is a non-toxic, lightweight, and corrosion-resistant material with good chemical stability and physical strength. Due to its superior performance, PVC-U drainage pipes are widely used in drainage systems. The manufacturing process of PVC-U drainage pipes is relatively simple, employing extrusion molding technology. This results in a smooth pipe surface and flat inner wall, effectively reducing fluid resistance and minimizing water turbulence. Furthermore, PVC-U drainage pipes possess good pressure resistance and impact resistance, making them suitable for use in various soil and environmental conditions. Their corrosion resistance also makes them less susceptible to chemical corrosion, resulting in a long service life.

[0003] Existing PVC-U drainage pipes require a smoother internal surface in some special operating environments, such as systems that require efficient drainage. Grinding the internal surface can reduce flow resistance and improve drainage efficiency. When repairing or modifying some old or damaged PVC-U drainage pipes, internal grinding is also required. Existing grinding equipment polishes the inside of the pipe through multiple grinding processes, and the powder produced during grinding affects the subsequent grinding effect, resulting in low efficiency. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a polishing device for the inner wall of PVC-U drainage pipes, which solves the problems of low efficiency and the impact of powder generated during polishing on subsequent polishing results due to repeated polishing and grinding of the pipe interior.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a PVC-U drain pipe inner wall polishing device, comprising a base, a stop block fixedly connected to the upper surface of the base at the left end; a channel for cleaning powder is provided inside the stop block; a positioning device is provided on the upper surface of the base near the stop block; the upper end of the positioning device clamps the drain pipe; a first electric push rod is provided on the upper surface of the base at the right end; an extension rod is fixedly connected to the output end of the first electric push rod; a limit block is sleeved on the surface of the extension rod, and the lower end of the limit block is fixedly connected to the upper surface of the base; a limit device is fixedly connected to the upper surface of the base near the limit block; and a polishing device for grinding the inner wall of the drain pipe is fixedly connected to the end of the extension rod.

[0006] Preferably, the positioning device includes a first fixing block, a second fixing block, a rotating rod, a third gear, a first motor, and an arc-shaped clamping plate; the first fixing block is fixedly connected to the upper surface of the base; the second fixing block is fixedly connected to the upper surface of the first fixing block; the first motor is fixedly connected to the inner surface of the second fixing block; one end of the rotating rod is fixedly connected to the output end of the first motor; the third gear is fixedly connected to the outer wall of the rotating rod; and the lower end of the arc-shaped clamping plate is fixedly connected to the outer surface of the third gear. Preferably, the limiting device includes a limiting column, a sliding ring, a moving plate, and a nozzle; the lower end of the limiting column is fixedly connected to the upper surface of the base; the sliding ring is slidably connected to the inner sidewall surface of the limiting column via a protrusion on the outer sidewall; the moving plate is fixedly connected to the protrusion of the sliding ring via an extension rod; the moving plate is slidably connected to the inner surface of the limiting column on the side facing the drainage pipe; and the nozzle is fixedly connected to the end surface of the moving plate facing the drainage pipe. Preferably, the polishing and grinding device includes a first gear, a positioning component, a grinding component, a cleaning component, an adjusting component, a second gear, a second motor, and a rotating rod; the rotating rod is rotatably connected to the inner surface of the extension rod; the first gear is fixedly connected to one end of the rotating rod located inside the extension rod; the second motor is fixedly connected to the inner surface of the extension rod; the second gear is fixedly connected to the output end of the second motor; the surfaces of the first gear and the second gear are engaged; the adjusting component is disposed on the inner surface of the extension rod for adjusting the cleaning component and the grinding component; the positioning component is disposed on the inner surface of the rotating rod; two grinding components are provided and sequentially disposed on the inner surface of the rotating rod; the cleaning component is disposed between the two grinding components. Preferably, the positioning component includes an arc-shaped adjusting block, an adjusting plate, and a positioning protrusion; the positioning protrusion is fixedly connected to the outer surface of the arc-shaped adjusting block; the arc-shaped adjusting block is fixedly connected to one end of the adjusting plate; and the adjusting plate is slidably connected to the inner surface of the rotating rod.

[0007] Preferably, the adjustment assembly includes a second electric push rod and a movable push head; the movable push head is rotatably connected to the output end of the second electric push rod; the second electric push rod is fixedly connected to the inner surface of the extension rod; and the surface of the movable push head is slidably connected to the inner wall surface of the rotating rod.

[0008] Preferably, the grinding assembly includes a grinding plate, bolts, a first expansion plate, a sliding rod, and a first spring; the grinding plate (50301) at one end of the two grinding assemblies (503) has a roughness greater than that of the grinding plate (50301) at the other end; the lower end of the sliding rod is fixedly connected to the upper surface of the adjusting plate; the upper end of the sliding rod is fixedly connected to the lower surface of the first expansion plate; the first spring is sleeved on the outer wall of the sliding rod; the upper end of the first spring is fixedly connected to the inner surface of the first expansion plate; the lower end of the first spring is fixedly connected to the inner surface of the rotating rod; the grinding plate is bolted to the inner surface of the first expansion plate; an elastic pad is provided between the grinding plate and the first expansion plate; the grinding plate moves on the inner surface of the first expansion plate through the elastic pad.

[0009] Preferably, the cleaning assembly includes a second expansion plate, a cleaning plate, a fixing rod, and a second spring; the lower end of the fixing rod is fixedly connected to the outer surface of the adjusting plate, and the upper end is fixedly connected to the inner surface of the second expansion plate; the second spring is sleeved on the outer surface of the fixing rod; the upper end of the second spring is fixedly connected to the inner surface of the second expansion plate, and the lower end is fixedly connected to the inner surface of the rotating rod; the cleaning plate is fixedly connected to the outer surface of the second expansion plate.

[0010] (III) Beneficial Effects This invention provides a polishing device for the inner wall of PVC-U drainage pipes. It has the following beneficial effects: 1. The polishing device uses two polishing components to simultaneously polish the inside of the drainage pipe. At the same time, the cleaning components and nozzles work together to blow away dust, preventing powder from interfering with the polishing process, thus enhancing the polishing effect and improving polishing efficiency.

[0011] 2. By adjusting the component settings, the grinding and cleaning components can be raised to accommodate pipes with different inner diameters, and the bolts provided facilitate the disassembly of the grinding plate.

[0012] 3. By setting up a positioning component to move the sliding ring, which in turn moves the moving plate, the nozzle is moved into the drainage pipe and then the nozzle leaves. This reduces the possibility of errors caused by manual operation and improves polishing efficiency. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the overall structure of a PVC-U drainage pipe inner wall polishing device proposed in this invention. Figure 2 This is a partial structural schematic diagram of a PVC-U drainage pipe inner wall polishing device proposed in this invention. Figure 3 This is a schematic diagram of the positioning device structure of a PVC-U drainage pipe inner wall polishing device proposed in this invention; Figure 4 This is a schematic diagram of the limiting device structure of a PVC-U drainage pipe inner wall polishing device proposed in this invention; Figure 5 This is a schematic diagram of the internal cross-sectional structure of the limiting device of the PVC-U drainage pipe inner wall polishing device proposed in this invention. Figure 6 This is a schematic diagram of the internal structure of the polishing and grinding device of the PVC-U drainage pipe inner wall polishing device proposed in this invention. Figure 7 This is a schematic diagram of the positioning component structure of a PVC-U drainage pipe inner wall polishing device proposed in this invention; Figure 8 For the present invention Figure 7 Enlarged view of section B in the middle; Figure 9 For the present invention Figure 7 Enlarged view of section A.

[0014] The components include: 1. Base; 2. Stop; 3. Positioning device; 301. First fixing block; 302. Second fixing block; 303. Rotating rod; 304. Third gear; 305. First motor; 306. Arc-shaped clamp; 4. First electric push rod; 5. Polishing and grinding device; 501. First gear; 502. Positioning assembly; 50201. Arc-shaped adjusting block; 50202. Adjusting plate; 50203. Positioning protrusion; 503. Grinding assembly; 50301. Grinding plate; 50302. Bolt; 50303. First expansion plate; 503... 04. Sliding rod; 50305. First spring; 504. Sweeping assembly; 50401. Second expansion plate; 50402. Sweeping plate; 50403. Fixed rod; 50404. Second spring; 505. Adjustment assembly; 50501. Second electric push rod; 50502. Moving push head; 506. Second gear; 507. Second motor; 508. Rotating rod; 6. Drainage pipe; 7. Limiting block; 8. Extension rod; 9. Limiting device; 901. Limiting column; 902. Sliding ring; 903. Moving plate; 904. Nozzle. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0016] Example 1: like Figure 1-9 As shown, this embodiment of the invention provides a PVC-U drain pipe inner wall polishing device, including a base 1, a stop block 2 fixedly connected to the upper surface of the base 1 at the left end; the inside of the stop block 2 is provided with a channel for cleaning powder; a positioning device 3 is provided on the upper surface of the base 1 near the stop block 2; the upper end of the positioning device 3 clamps the drain pipe 6; a first electric push rod 4 is provided on the upper surface of the base 1 at the right end; an extension rod 8 is fixedly connected to the output end of the first electric push rod 4; a limiting block 7 is sleeved on the surface of the extension rod 8, and the lower end of the limiting block 7 is fixedly connected to the upper surface of the base 1; a limiting device 9 is fixedly connected to the upper surface of the base 1 near the limiting block 7; and a polishing and grinding device 5 for grinding the inner wall of the drain pipe 6 is fixedly connected to the end of the extension rod 8.

[0017] In the above, the inside of the baffle 2 is provided with a through groove of a diameter that allows the polishing and grinding device 5 to pass through, while the drainage pipe 6 cannot pass through.

[0018] The positioning device 3 includes a first fixing block 301, a second fixing block 302, a rotating rod 303, a third gear 304, a first motor 305, and an arc-shaped clamping plate 306. The first fixing block 301 is fixedly connected to the upper surface of the base 1. The second fixing block 302 is fixedly connected to the upper surface of the first fixing block 301. The first motor 305 is fixedly connected to the inner surface of the second fixing block 302. One end of the rotating rod 303 is fixedly connected to the output end of the first motor 305. The third gear 304 is fixedly connected to the outer wall of the rotating rod 303. The lower end of the arc-shaped clamping plate 306 is fixedly connected to the outer surface of the third gear 304. In the above, the two opposing third gears 304 mesh and rotate, causing the arc-shaped clamping plate 306 to clamp the drainage pipe 6 in the middle.

[0019] The limiting device 9 includes a limiting column 901, a sliding ring 902, a moving plate 903, and a nozzle 904; the lower end of the limiting column 901 is fixedly connected to the upper surface of the base 1; the sliding ring 902 is slidably connected to the inner side wall surface of the limiting column 901 through a protrusion on the outer side wall; the moving plate 903 is fixedly connected to the protrusion of the sliding ring 902 through an extension rod; the moving plate 903 is slidably connected to the inner surface of the limiting column 901 on one side in the direction of the drainage pipe 6; and the nozzle 904 is fixedly connected to the end surface of the moving plate 903 on one end in the direction of the drainage pipe 6. In the above, the protrusion below the sliding ring 902 is connected to the moving plate 903 and is used to move the moving plate 903.

[0020] The polishing and grinding device 5 includes a first gear 501, a positioning component 502, a grinding component 503, a cleaning component 504, an adjusting component 505, a second gear 506, a second motor 507, and a rotating rod 508. The rotating rod 508 is rotatably connected to the inner surface of the extension rod 8. The first gear 501 is fixedly connected to one end of the rotating rod 508 located inside the extension rod 8. The second motor 507 is fixedly connected to the inner surface of the extension rod 8. The second gear 506 is fixedly connected to the output end of the second motor 507. The surfaces of the first gear 501 and the second gear 506 are meshed. The adjusting component 505 is disposed on the inner surface of the extension rod 8 to adjust the cleaning component 504 and the grinding component 503. The positioning component 502 is disposed on the inner surface of the rotating rod 508. Two grinding components 503 are provided and are sequentially disposed on the inner surface of the rotating rod 508. The cleaning component 504 is disposed between the two grinding components 503. The positioning component 502 includes an arc-shaped adjusting block 50201, an adjusting plate 50202, and a positioning protrusion 50203; the positioning protrusion 50203 is fixedly connected to the outer surface of the arc-shaped adjusting block 50201; the arc-shaped adjusting block 50201 is fixedly connected to one end of the adjusting plate 50202; and the adjusting plate 50202 is slidably connected to the inner surface of the rotating rod 508.

[0021] In the above, the positioning protrusion 50203 is used to position the sliding ring 902 so that when the rotating rod 508 moves, the sliding ring 902 can also be moved out, thereby moving the nozzle 904.

[0022] The adjustment assembly 505 includes a second electric push rod 50501 and a movable push head 50502; the movable push head 50502 is rotatably connected to the output end of the second electric push rod 50501; the second electric push rod 50501 is fixedly connected to the inner surface of the extension rod 8; the surface of the movable push head 50502 is slidably connected to the inner wall surface of the rotating rod 508.

[0023] The grinding assembly 503 includes a grinding plate 50301, a bolt 50302, a first expanding plate 50303, a sliding rod 50304, and a first spring 50305. The grinding plate 50301 at one end of the two grinding assemblies 503 has a higher surface roughness than the grinding plate 50301 at the other end. The lower end of the sliding rod 50304 is fixedly connected to the upper surface of the adjusting plate 50202. The upper end of the sliding rod 50304 is fixedly connected to the lower surface of the first expanding plate 50303. The first spring 50305 is sleeved on... The outer wall of the sliding rod 50304; the upper end of the first spring 50305 is fixedly connected to the inner surface of the first expansion plate 50303; the lower end of the first spring 50305 is fixedly connected to the inner surface of the rotating rod 508; the grinding plate 50301 is installed on the inner surface of the first expansion plate 50303 by bolts 50302; an elastic pad is provided between the grinding plate 50301 and the first expansion plate 50303; the grinding plate 50301 moves on the inner surface of the first expansion plate 50303 through the elastic pad.

[0024] In the above, the surface roughness of the grinding plate 50301 located at one end is rougher than that of the grinding plate 50301 at the other end.

[0025] The cleaning assembly 504 includes a second expansion plate 50401, a cleaning plate 50402, a fixing rod 50403, and a second spring 50404. The lower end of the fixing rod 50403 is fixedly connected to the outer wall surface of the adjusting plate 50202, and the upper end is fixedly connected to the inner surface of the second expansion plate 50401. The second spring 50404 is sleeved on the outer wall surface of the fixing rod 50403. The upper end of the second spring 50404 is fixedly connected to the inner surface of the second expansion plate 50401, and the lower end is fixedly connected to the inner surface of the rotating rod 508. The cleaning plate 50402 is fixedly connected to the outer wall surface of the second expansion plate 50401.

[0026] In the above, the cleaning plate 50402 is an existing material used to clean the powder produced by the grinding plate 50301 at the front end of the inner wall of the drainage pipe 6.

[0027] Working principle: The drain pipe 6 is placed between the arc-shaped clamps 306. Then, the first motor 305 is started, which drives the third gear 304 to rotate. The meshing of the third gear 304 drives the arc-shaped clamps 306 on both sides to clamp the drain pipe 6 in the middle and fix the drain pipe 6. Then, the first electric push rod 4 is started to move the extension rod 8, which in turn moves the polishing and grinding device 5 at the end of the extension rod 8. When the polishing and grinding device 5 moves, it is driven by the positioning protrusion 50203 on the arc-shaped adjusting block 50201. As the sliding ring 902 moves, the protrusion at its lower end, which slides inside the limiting column 901, drives the moving plate 903 to move. The moving plate 903 moves the nozzle 904 to the port of the drainage pipe 6. Simultaneously, the polishing device 5 moves into the port of the drainage pipe 6. Then, the arc-shaped adjusting block 50201 leaves the sliding ring 902, releasing the limiting effect on the adjusting plate 50202. At this point, the first expanding plate 50303 and the second expanding plate 50401 move in conjunction with the first spring 50305 and... Under the action of the second spring 50404, the outward expansion part simultaneously activates the second electric push rod 50501 to move the moving push head 50502, thereby moving the moving push head 50502 outward, so that the grinding plate 50301 and the cleaning plate 50402 contact the inner wall of the drainage pipe 6. Then, the second motor 507 is activated to drive the second gear 506 to rotate. The rotation of the second gear 506 drives the rotating rod 508 to rotate through the first gear 501. First, the grinding assembly 503 at the end part rough grinds the inner wall of the drainage pipe 6, and then... The rotation of the cleaning component 504 agitates the coarsely ground powder and moves it towards the end position for cleaning. At the same time, the output position of the nozzle 904 sprays gas to blow the ground powder into the through groove inside the baffle 2 to assist in cleaning dust and powder. Then, the polishing component 503 at the other end of the cleaning component 504 performs fine grinding and polishing on the inside of the drainage pipe 6. After polishing is completed, the second electric push rod 50501 is activated to move the moving push head 50502 back to its original position. Then, the first electric push rod 4 is activated to remove the polishing and grinding device 5 from the drainage pipe 6.

[0028] Example 2: The difference between this embodiment and Embodiment 1 is that: If cooling is required when polishing in drainage pipe 6, you can choose to spray water from nozzle 904 to cool it down. At the same time, the water flow can also carry away polishing dust and improve the polishing effect.

[0029] Example 3: The difference between this embodiment and Embodiment 1 is that: Before the positioning device 3 clamps the drainage pipe 6, the grinding device 5 can be started to move the drainage pipe 6 to the position of the stop block 2, thereby reducing the wear on the transverse position inside the arc-shaped clamping plate 306.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A polishing device for the inner wall of a PVC-U drainage pipe, comprising a base (1), characterized in that: A stop block (2) is fixedly connected to the upper surface of the base (1) at the left end; the inside of the stop block (2) is provided with a channel for cleaning powder; a positioning device (3) is provided on the upper surface of the base (1) near the stop block (2); the upper end of the positioning device (3) clamps the drainage pipe (6); a first electric push rod (4) is provided on the upper surface of the base (1) at the right end; an extension rod (8) is fixedly connected to the output end of the first electric push rod (4); a limit block (7) is sleeved on the surface of the extension rod (8), and the lower end of the limit block (7) is fixedly connected to the upper surface of the base (1); a limit device (9) is fixedly connected to the upper surface of the base (1) near the limit block (7); a polishing device (5) for polishing the inner wall of the drainage pipe (6) is fixedly connected to the end of the extension rod (8).

2. The PVC-U drainage pipe inner wall polishing device according to claim 1, characterized in that: The positioning device (3) includes a first fixing block (301), a second fixing block (302), a rotating rod (303), a third gear (304), a first motor (305), and an arc-shaped clamping plate (306); the first fixing block (301) is fixedly connected to the upper surface of the base (1); the second fixing block (302) is fixedly connected to the upper surface of the first fixing block (301); the first motor (305) is fixedly connected to the inner surface of the second fixing block (302); one end of the rotating rod (303) is fixedly connected to the output end of the first motor (305); the third gear (304) is fixedly connected to the outer wall of the rotating rod (303); and the lower end of the arc-shaped clamping plate (306) is fixedly connected to the outer surface of the third gear (304).

3. The PVC-U drainage pipe inner wall polishing device according to claim 1, characterized in that: The limiting device (9) includes a limiting column (901), a sliding ring (902), a moving plate (903), and a nozzle (904); the lower end of the limiting column (901) is fixedly connected to the upper surface of the base (1); the sliding ring (902) is slidably connected to the inner side wall surface of the limiting column (901) through a protrusion on the outer side wall; the moving plate (903) is fixedly connected to the protrusion of the sliding ring (902) through an extension rod; the moving plate (903) is slidably connected to the inner surface of the limiting column (901) on one side in the direction of the drainage pipe (6); the nozzle (904) is fixedly connected to the end surface of the moving plate (903) on one end in the direction of the drainage pipe (6).

4. The PVC-U drainage pipe inner wall polishing device according to claim 1, characterized in that: The polishing and grinding device (5) includes a first gear (501), a positioning component (502), a grinding component (503), a cleaning component (504), an adjusting component (505), a second gear (506), a second motor (507), and a rotating rod (508); the rotating rod (508) is rotatably connected to the inner surface of the extension rod (8); the first gear (501) is fixedly connected to one end of the rotating rod (508) located inside the extension rod (8); the second motor (507) is fixedly connected to the inner surface of the extension rod (8); the second gear (506) is fixedly connected to the inner surface of the extension rod (8); the second gear (506) is fixedly connected to the inner surface of the extension rod (8); the second gear (506) is fixedly connected to the inner surface of the extension rod (8); the second gear (506) is fixedly connected to the inner surface of the extension rod (8); the second gear (506) is fixedly connected to the inner surface of the extension rod (8); the second gear (506) is fixedly connected to the inner surface of the extension rod (8); the second gear (506) is fixedly connected to the inner surface of the extension rod (8); the second gear (507 ...6) is fixedly connected to the inner surface of the extension rod (8); the second gear (506) is fixedly connected to the inner surface of the extension rod (8); the second gear (506) is fixedly The first gear (501) is fixedly connected to the output end of the second motor (507); the surfaces of the first gear (501) and the second gear (506) are meshed; the adjustment component (505) is set on the inner surface of the extension rod (8) to adjust the cleaning component (504) and the polishing component (503); the positioning component (502) is set on the inner surface of the rotating rod (508); there are two polishing components (503), which are arranged sequentially on the inner surface of the rotating rod (508); the cleaning component (504) is set between the two polishing components (503).

5. The PVC-U drainage pipe inner wall polishing device according to claim 4, characterized in that: The positioning component (502) includes an arc-shaped adjusting block (50201), an adjusting plate (50202), and a positioning protrusion (50203); the positioning protrusion (50203) is fixedly connected to the outer surface of the arc-shaped adjusting block (50201); the arc-shaped adjusting block (50201) is fixedly connected to one end of the adjusting plate (50202); and the adjusting plate (50202) is slidably connected to the inner surface of the rotating rod (508).

6. The PVC-U drainage pipe inner wall polishing device according to claim 4, characterized in that: The adjustment assembly (505) includes a second electric push rod (50501) and a movable push head (50502); the movable push head (50502) is rotatably connected to the output end of the second electric push rod (50501); the second electric push rod (50501) is fixedly connected to the inner surface of the extension rod (8); the surface of the movable push head (50502) is slidably connected to the inner wall surface of the rotating rod (508).

7. The PVC-U drainage pipe inner wall polishing device according to claim 4, characterized in that: The grinding assembly (503) includes a grinding plate (50301), a bolt (50302), a first expansion plate (50303), a sliding rod (50304), and a first spring (50305); the grinding plate (50301) at one end of the two grinding assemblies (503) has a roughness greater than that at the other end; the lower end of the sliding rod (50304) is fixedly connected to the upper surface of the adjusting plate (50202); the upper end of the sliding rod (50304) is fixedly connected to the lower surface of the first expansion plate (50303); the first spring (50305) is sleeved... The upper end of the first spring (50305) is fixedly connected to the inner surface of the first expansion plate (50303); the lower end of the first spring (50305) is fixedly connected to the inner surface of the rotating rod (508); the grinding plate (50301) is installed on the inner surface of the first expansion plate (50303) by bolts (50302); an elastic pad is provided between the grinding plate (50301) and the first expansion plate (50303); the grinding plate (50301) moves on the inner surface of the first expansion plate (50303) through the elastic pad.

8. The PVC-U drainage pipe inner wall polishing device according to claim 4, characterized in that: The cleaning assembly (504) includes a second expansion plate (50401), a cleaning plate (50402), a fixing rod (50403), and a second spring (50404). The lower end of the fixing rod (50403) is fixedly connected to the outer wall surface of the adjusting plate (50202), and the upper end is fixedly connected to the inner surface of the second expansion plate (50401). The second spring (50404) is sleeved on the outer wall surface of the fixing rod (50403). The upper end of the second spring (50404) is fixedly connected to the inner surface of the second expansion plate (50401), and the lower end is fixedly connected to the inner surface of the rotating rod (508). The cleaning plate (50402) is fixedly connected to the outer wall surface of the second expansion plate (50401).

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