A surface grinding device for steel-plastic composite pipes

Abstract

This invention belongs to the field of steel-plastic composite pipe manufacturing technology, and discloses a surface grinding equipment for steel-plastic composite pipes. The equipment includes a frame, a grinding station located on the frame, clamping mechanisms distributed at both ends of the grinding station, a support mechanism distributed below the grinding station, and a grinding mechanism located on the side of the grinding station. The grinding mechanism includes a base, multiple guide rods, multiple grinding blocks respectively fixed on the guide rods, a clamping assembly mounted on the base for clamping the guide rods, a first drive assembly, a calibration assembly, and a second drive assembly. This invention has the following advantages and effects: The calibration assembly calibrates the position of the grinding blocks, and the clamping assembly clamps and fixes the guide rods to fix the position of the grinding blocks. This allows for periodic calibration of the grinding block position, avoiding inconsistent grinding effects on the steel-plastic composite pipe surface caused by grinding block wear, and effectively ensuring the stability and consistency of the grinding operation.

Description

Technical Field

[0001] This invention relates to the field of steel-plastic composite pipe manufacturing technology, and in particular to a surface grinding device for steel-plastic composite pipes. Background Technology

[0002] Steel-plastic composite pipes are a new type of composite pipe made by combining steel pipes and plastics. They are classified into four types according to their structure: steel strip reinforcement, seamless steel pipe reinforcement, perforated steel strip, and steel wire mesh reinforcement. A typical structure consists of an inner steel strip layer combined with inner and outer polyethylene layers, possessing high strength, corrosion resistance, and oxygen barrier properties, making it suitable for applications in oil, natural gas, water supply, and drainage.

[0003] During the manufacturing process of steel-plastic composite pipes, surface grinding is required. There is limited existing literature on surface grinding of steel-plastic composite pipes. One document, titled "Design of a Surface Grinding Device for Steel-Plastic Composite Pipes," published in the journal *Internal Combustion Engines and Accessories*, discloses a surface grinding device for steel-plastic composite pipes. Chinese invention patent CN118952024B discloses a surface polishing device for steel-plastic composite pipes.

[0004] Taking the aforementioned patent literature as an example, during the polishing process, a third spring applies elastic force to the polishing block, causing it to adhere tightly to the surface of the steel-plastic composite pipe for polishing. However, this method has the following problems: the longer the polishing time, the more wear occurs on the surface of the polishing block; the elastic deformation of the third spring varies, resulting in changes in the magnitude of the elastic force; and the force applied to different steel-plastic composite pipe surfaces during operation is inconsistent, making it difficult to ensure a uniform polishing force throughout the polishing process. Furthermore, the deterioration of the third spring is difficult to assess; once a reduction in elastic force occurs, it is difficult for operators to detect it immediately, leading to difficulties in controlling the quality of the polished products. Summary of the Invention

[0005] The purpose of this invention is to provide a surface grinding device for steel-plastic composite pipes, which has the effect of calibrating the position of the grinding block.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a surface grinding device for steel-plastic composite pipes, comprising a frame and a grinding station located on the frame. The frame is provided with clamping mechanisms distributed at both ends of the grinding station, a supporting mechanism distributed below the grinding station, and a grinding mechanism located on the side of the grinding station. The grinding mechanism includes a base, multiple guide rods, multiple grinding blocks respectively fixed on the multiple guide rods, a clamping assembly mounted on the base for clamping the guide rods, a first driving assembly for driving the base to move closer to or away from the grinding station, a calibration assembly, and a second driving assembly for driving the calibration assembly to move. The base has guide holes through which the multiple guide rods pass. Each guide rod is equipped with a detection spring. One end of the detection spring is fixed to the base, and the other end is fixed to the guide rod or in contact with the grinding block. A calibration station is provided on the side of the base. When the calibration assembly is located at the calibration station, the elastic force of the calibration spring drives the grinding block to press against the calibration assembly.

[0007] By adopting the above technical solution, the steel-plastic composite pipe to be ground is placed in the grinding station. The clamping mechanism holds the steel-plastic composite pipe, the supporting mechanism supports the steel-plastic composite pipe, and the first driving component drives the base closer to the grinding station, so that the grinding block is pressed tightly against the steel-plastic composite pipe in the grinding station. As the steel-plastic composite pipe rotates, the grinding block grinds the surface of the steel-plastic composite pipe. After the grinding operation is completed, the first driving component drives the base away from the grinding station, so that the ground steel-plastic composite pipe can be removed from the grinding station, and then the next steel-plastic composite pipe to be ground can be placed in the grinding station to continue the grinding operation.

[0008] When the operator visually observes that the grinding block is severely worn or has reached the predetermined calibration time, the first drive component moves the base away from the grinding station, the clamping component reduces the clamping force of the guide rod, and the second drive component moves the calibration component into the calibration station. The detection spring force forces the grinding block to adhere tightly to the calibration component. The worn grinding block also reaches the predetermined calibration position. The clamping component increases the clamping force of the guide rod, locking the guide rod and grinding block in place. Even if the grinding block wears down during operation, it can be moved back to the predetermined position through calibration, ensuring good stability and consistency in the grinding effect of the steel-plastic composite pipe product.

[0009] A further configuration of the present invention is as follows: the clamping mechanism includes two clamps distributed at both ends of the grinding station. Each clamp includes a rotating shaft rotatably connected to the frame, a movable sleeve circumferentially fixed and axially slidingly disposed on the rotating shaft, an adjusting cylinder mounted on the rotating shaft to drive the movable sleeve to slide axially, a disc fixed on the movable sleeve, and a plurality of grippers disposed on the disc. The plurality of grippers are evenly distributed along the circumference of the disc. Each gripper includes a clamping seat, an outer gripper fixed on the clamping seat, and an inner gripper fixed on the clamping seat. An outer clamping cylinder is mounted on the outer gripper, and an inner clamping cylinder is mounted on the inner gripper. An end clamping rubber pad is fixed on the clamping seat, and the end clamping rubber pad is used to contact the end of the steel-plastic composite pipe.

[0010] By adopting the above technical solution, the steel-plastic composite pipe is placed in the grinding station and supported by the supporting mechanism. The piston rod of the adjusting cylinder extends to drive the movable sleeve to approach the steel-plastic composite pipe in the grinding station. The disc moves together with the movable sleeve. The end of the clamping claw on the disc presses the rubber pad against the end of the steel-plastic composite pipe. The piston rod of the outer clamping cylinder on the outer claw extends, and the piston rod of the inner clamping cylinder on the inner claw extends to complete the clamping of the steel-plastic composite pipe. During the rotation of the rotating shaft, the steel-plastic composite pipe can be rotated.

[0011] A further configuration of the present invention is as follows: the disc body has multiple sliding grooves arranged radially along the disc body, and each of the multiple sliding grooves corresponds to a multiple of the grippers. The clamping seat is slidably connected within the sliding grooves. The disc body is provided with a gripper adjustment assembly for adjusting and locking the grippers to move radially along the disc body. The gripper adjustment assembly includes multiple lead screws arranged radially along the disc body and rotatably connected to the disc body at both ends, multiple nut assemblies mounted on the multiple lead screws, a driven bevel gear fixed to each lead screw, a cover rotatably connected to the disc body, a disc gear fixed to the cover, and a locking bolt threadedly connected to the cover. The disc body has multiple locking holes for the locking bolts to be inserted into, and the multiple driven bevel gears mesh with the disc gear.

[0012] By adopting the above technical solution, the clamping structure of the present invention can clamp steel-plastic composite pipes of different sizes and specifications. Loosen the locking bolt to disengage it from the locking hole, rotate the cover, and the cover drives the disc gear and driven bevel gear to rotate the lead screw. The lead screw drives the nut assembly and the grippers to move. Since the grippers rotate synchronously, their movement is also synchronous. After the grippers are positioned correctly, tighten the locking bolt to insert it into the locking hole, locking the cover and disc gear in place.

[0013] A further configuration of the present invention is as follows: the number of external clamping cylinders and the number of internal clamping cylinders are both several, the piston rod of the external clamping cylinder is fixed with an external clamping rubber pad, and the piston rod of the internal clamping cylinder is fixed with an internal clamping rubber pad.

[0014] By adopting the above technical solution, the outer compression rubber pad is used to directly contact the outer wall of the steel-plastic composite pipe, and the inner compression rubber pad is used to directly contact the inner wall of the steel-plastic composite pipe.

[0015] A further feature of the present invention is that the rotating shaft is fixed with an air supply pipeline, the air supply pipeline provides compressed air to the external compression cylinder, the internal compression cylinder, and the adjusting cylinder, and the air supply pipeline is equipped with a rotary joint.

[0016] By adopting the above technical solutions, the rotary joint is also known as a pneumatic rotary joint, rotary air joint, or rotary sealing joint.

[0017] A further provision of the present invention is that the frame is equipped with a motor, and the motor drives at least one of the rotating shafts to rotate.

[0018] A further configuration of the present invention is as follows: the calibration component includes a calibration frame, a central shaft rotatably connected to the calibration frame, and a plurality of calibration arc plates. A connecting rod is provided between the calibration arc plates and the central shaft. A plurality of positioning holes are provided on the central shaft. The calibration frame is threadedly connected to a positioning bolt, and the screw of the positioning bolt is inserted into the positioning hole.

[0019] By adopting the above technical solution, different calibration arc plates correspond to steel-plastic composite pipes of different sizes and specifications. After loosening the positioning bolts to make them disengage from the positioning holes, rotating the central shaft drives the calibration arc plate to move, and different calibration arc plates can be switched according to the size and specifications of the steel-plastic composite pipe to be ground.

[0020] A further feature of the present invention is that the two ends of the calibration frame are rotatably connected to the frame, and the second drive component is a rotary cylinder mounted on the frame.

[0021] By adopting the above technical solution, the rotary cylinder drives the calibration frame to rotate, so as to realize the calibration arc plate on the central axis entering and leaving the calibration station.

[0022] A further feature of the present invention is that the calibration arc plate has a countersunk hole, and a countersunk bolt threaded to the connecting rod is provided in the countersunk hole.

[0023] A further configuration of the present invention is as follows: the supporting mechanism includes a supporting support, a supporting rod, and a supporting wheel rotatably connected to the upper end of the supporting rod; the supporting support has a vertically opened insertion hole; the lower end of the supporting rod is inserted into the insertion hole; the supporting rod has multiple threaded holes, which are spaced apart along the vertical direction on the supporting rod; the supporting support has a through hole, and an adjusting bolt is threaded through the through hole and connected to the threaded hole.

[0024] By adopting the above technical solution, rotating the adjusting bolt to disengage it from the threaded hole allows the support rod to be adjusted to drive the support wheel to rise and fall, thus adapting to steel-plastic composite pipes of different sizes and specifications in the grinding station.

[0025] The beneficial effects of this invention are:

[0026] 1. The present invention calibrates the position of the grinding block by means of calibration component and fixes the position of the grinding block by means of clamping and fixing guide rod by clamping component. It can realize the periodic calibration of the position of grinding block, avoid the uneven grinding effect on the surface of steel-plastic composite pipe after the grinding block wears, and effectively ensure the stability and consistency of grinding operation.

[0027] 2. This invention, through its designed clamping structure, adapts to the clamping operations of steel-plastic composite pipes of different diameters by adjusting the radial position of the grippers along the disc body. This avoids the significant time wasted by directly changing clamps, effectively improving production efficiency. Simultaneously, the clamping mechanism uses friction from multiple points—end-pressing rubber pads, inner-wall pressing rubber pads, and outer-wall pressing rubber pads—to drive the rotation of the steel-plastic composite pipe. This not only prevents damage or scratches to the pipe surface caused by clamping but also enables grinding operations by rotating the pipe. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the clamp structure of the present invention. Figure 1 .

[0030] Figure 3 This is a schematic diagram of the clamp structure of the present invention. Figure 2 .

[0031] Figure 4 yes Figure 3 Enlarged view of point A.

[0032] Figure 5 This is a schematic diagram of the housing and disc body separated in this invention.

[0033] Figure 6 This is a schematic diagram of the grinding mechanism of the present invention.

[0034] Figure 7 This is a schematic diagram showing the positional relationship between the base, grinding block, and guide rod of the present invention.

[0035] Figure 8 This is a schematic diagram of the calibration component structure of the present invention.

[0036] Figure 9 This is a schematic diagram of the support mechanism structure of the present invention.

[0037] In the diagram, 1. Frame; 2. Clamping mechanism; 21. Rotating shaft; 211. Limiting groove; 22. Movable sleeve; 221. Limiting block; 23. Adjusting cylinder; 24. Disc body; 241. Slide groove; 242. Locking hole; 25. Gripper; 251. Grip seat; 252. Outer gripper; 253. Inner gripper; 254. Outer clamping cylinder; 255. Inner clamping cylinder; 256. Outer clamping rubber pad; 257. Inner clamping rubber pad; 258. End clamping rubber pad; 26. Gripper adjusting assembly; 261. Lead screw; 262. Driven bevel gear; 263. Disc shape 1. Gear; 264. Locking bolt; 265. Cover; 3. Grinding mechanism; 31. Base; 32. Guide rod; 33. Grinding block; 34. Clamping assembly; 35. First drive assembly; 36. Calibration assembly; 361. Calibration frame; 362. Central shaft; 363. Calibration arc plate; 364. Connecting rod; 365. Positioning bolt; 37. Second drive assembly; 38. Detection spring; 4. Support mechanism; 41. Support support; 42. Support rod; 43. Support wheel; 44. Threaded hole; 45. Adjusting bolt; 5. Motor; 6. Steel-plastic composite pipe. Detailed Implementation

[0038] A surface grinding device for steel-plastic composite pipes, such as Figure 1 As shown, it includes a frame 1, a grinding station located on the frame 1, and a clamping mechanism 2 distributed at both ends of the grinding station, a supporting mechanism 4 distributed below the grinding station, and a grinding mechanism 3 located on the side of the grinding station.

[0039] like Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the clamping mechanism 2 includes two clamps distributed at both ends of the grinding station. Each clamp includes a rotating shaft 21 rotatably connected to the frame 1, a movable sleeve 22 circumferentially fixed and axially slidingly disposed on the rotating shaft 21, an adjusting cylinder 23 mounted on the rotating shaft 21 to drive the movable sleeve 22 to slide axially, a disc 24 fixed on the movable sleeve 22, and multiple jaws 25 disposed on the disc 24. The multiple jaws 25 are evenly distributed along the circumference of the disc 24. Each jaw 25 includes a clamping seat 251, an outer jaw 252 fixed to the clamping seat 251, and an inner jaw 253 fixed to the clamping seat 251. An outer clamping cylinder 254 is mounted on the outer jaw 252, and an outer clamping rubber pad 256 is fixed to the piston rod of the outer clamping cylinder 254. An inner clamping cylinder 255 is mounted on the inner jaw 253, and an inner clamping rubber pad 257 is fixed to the piston rod of the inner clamping cylinder 255. The clamp 251 is fixed with an end-pressing rubber pad 258, which is used to contact the end of the steel-plastic composite pipe 6. A limiting groove 211 is opened on the rotating shaft 21, and the limiting groove 211 is opened along the axial direction of the rotating shaft 21. A limiting block 221 is fixed on the inner wall of the movable sleeve 22, and the limiting block 221 is embedded in the limiting groove 211 and can slide along the limiting groove 211.

[0040] like Figure 2 As shown, the disc body 24 has multiple sliding grooves 241 arranged radially along the disc body 24. Each sliding groove 241 corresponds to a single clamping jaw 25. A clamping seat 251 is slidably connected within the sliding groove 241. The disc body 24 is equipped with a clamping jaw adjustment assembly 26 for adjusting and locking the clamping jaws 25 radially along the disc body 24. The clamping jaw adjustment assembly 26 includes multiple lead screws 261 arranged radially along the disc body 24 and rotatably connected to both ends of the disc body 24; multiple nut assemblies mounted on the multiple lead screws 261; a driven bevel gear 262 fixed to each lead screw 261; a cover 265 rotatably connected to the disc body 24; a disc gear 263 fixed to the cover 265; and a locking bolt 264 threadedly connected to the cover 265. The disc body 24 has multiple locking holes 242 for inserting the locking bolt 264. All driven bevel gears 262 mesh with the disc gear 263.

[0041] A rotating shaft 21 is fixed with an air supply line, which provides compressed air to the external pressure cylinder 254, the internal pressure cylinder 255, and the adjusting cylinder 23. The air supply line is equipped with a rotary joint, which is connected to an air pipe, which is connected to an air source. A motor 5 is mounted on the frame 1, and the motor 5 drives one of the rotating shafts 21 to rotate.

[0042] like Figure 6 , Figure 7 As shown, the grinding mechanism 3 includes a base 31, multiple guide rods 32, multiple grinding blocks 33 respectively fixed on the multiple guide rods 32, a clamping assembly 34 mounted on the base 31 for clamping the guide rods 32, a first driving assembly 35 for driving the base 31 to move closer to or away from the grinding station, a calibration assembly 36, and a second driving assembly 37 for driving the calibration assembly 36 to move. The base 31 has guide holes through which the multiple guide rods 32 pass. Each guide rod 32 is equipped with a detection spring 38. One end of the detection spring 38 is fixed to the base 31, and the other end is fixed to the guide rod 32 or in contact with the grinding block 33. A calibration station is provided on the side of the base 31. When the calibration assembly 36 is located at the calibration station, the spring force of the calibration spring drives the grinding block 33 to press against the calibration assembly 36.

[0043] like Figure 8As shown, the calibration assembly 36 includes a calibration frame 361, a central shaft 362 rotatably connected to the calibration frame 361, and multiple calibration arc plates 363. A connecting rod 364 is provided between the calibration arc plates 363 and the central shaft 362. Multiple positioning holes are provided on the central shaft 362. Positioning bolts 365 are threadedly connected to the calibration frame 361, with the screws of the positioning bolts 365 inserted into the positioning holes. Both ends of the calibration frame 361 are rotatably connected to the frame 1. The second drive assembly 37 is a rotary cylinder mounted on the frame 1, used to drive the rotation of the calibration frame 361. The calibration arc plates 363 have countersunk holes, and countersunk bolts threadedly connected to the connecting rod 364 are provided within the countersunk holes.

[0044] like Figure 9 As shown, the supporting mechanism 4 includes a supporting support 41, a supporting rod 42, and a supporting wheel 43 rotatably connected to the upper end of the supporting rod 42. The supporting support 41 has a vertically opened insertion hole, and the lower end of the supporting rod 42 is inserted into the insertion hole. The supporting rod 42 has multiple threaded holes 44, which are distributed vertically on the supporting rod 42 at intervals. The supporting support 41 has a through hole, and an adjusting bolt 45 is threaded through the through hole and connected to the threaded hole 44.

[0045] Working principle: The steel-plastic composite pipe 6 to be ground is placed in the grinding station. The clamping mechanism 2 clamps the steel-plastic composite pipe 6, and the supporting mechanism 4 supports the steel-plastic composite pipe 6. The first driving component 35 drives the base 31 closer to the grinding station, so that the grinding block 33 is pressed against the steel-plastic composite pipe 6 in the grinding station. As the steel-plastic composite pipe 6 rotates, the grinding block 33 grinds the surface of the steel-plastic composite pipe 6. After the grinding operation is completed, the first driving component 35 drives the base 31 away from the grinding station, so that the ground steel-plastic composite pipe 6 can be removed from the grinding station. Then, the next steel-plastic composite pipe 6 to be ground is placed in the grinding station to continue the grinding operation.

[0046] When the operator visually observes that the grinding block 33 is severely worn or has reached the predetermined calibration time, the first drive assembly 35 drives the base 31 to move away from the grinding station, the clamping assembly 34 reduces the clamping force of the guide rod 32, and the second drive assembly 37 drives the calibration assembly 36 to move into the calibration station. The detection spring 38 forces the grinding block 33 to adhere tightly to the calibration assembly 36. The worn grinding block 33 also reaches the predetermined calibration position. The clamping assembly 34 increases the clamping force of the guide rod 32, locking the guide rod 32 and the grinding block 33 in position. Even if the grinding block 33 wears during operation, it can be moved back to the predetermined position through the calibration operation, ensuring good stability and consistency in the grinding effect of the steel-plastic composite pipe 6 product.

Claims

1. A surface grinding device for steel-plastic composite pipes, characterized in that: Includes a frame (1), a grinding station located on the frame (1), the frame (1) having clamping mechanisms (2) distributed at both ends of the grinding station, a support mechanism (4) distributed below the grinding station, and a grinding mechanism (3) located on the side of the grinding station. The grinding mechanism (3) includes a base (31), multiple guide rods (32), multiple grinding blocks (33) respectively fixed on the multiple guide rods (32), a clamping assembly (34) mounted on the base (31) for clamping the guide rods (32), a first driving assembly (35) for driving the base (31) to move closer to or away from the grinding station, and calibration. The components (36) and the second drive component (37) that drive the calibration component (36) to move are provided. The base (31) has guide holes through which multiple guide rods (32) pass. Each guide rod (32) is equipped with a detection spring (38). One end of the detection spring (38) is fixed to the base (31), and the other end is fixed to the guide rod (32) or in contact with the grinding block (33). The base (31) has a calibration station on its side. When the calibration component (36) is located at the calibration station, the spring force of the calibration spring drives the grinding block (33) to press against the calibration component (36). The clamping mechanism (2) includes two clamps distributed at both ends of the grinding station. Each clamp includes a rotating shaft (21) rotatably connected to the frame (1), a movable sleeve (22) circumferentially fixed and axially sliding on the rotating shaft (21), an adjusting cylinder (23) mounted on the rotating shaft (21) to drive the movable sleeve (22) to slide axially, a disc (24) fixed on the movable sleeve (22), and multiple jaws (25) provided on the disc (24). The multiple jaws (25) move along the grinding station. The disc body (24) is evenly distributed in the circumferential direction. The jaws (25) include a clamping seat (251), an outer jaw (252) fixed on the clamping seat (251), and an inner jaw (253) fixed on the clamping seat (251). An outer clamping cylinder (254) is installed on the outer jaw (252), and an inner clamping cylinder (255) is installed on the inner jaw (253). An end clamping rubber pad (258) is fixed on the clamping seat (251). The end clamping rubber pad (258) is used to contact the end of the steel-plastic composite pipe (6). The calibration component (36) includes a calibration frame (361), a central shaft (362) rotatably connected to the calibration frame (361), and a plurality of calibration arc plates (363). A connecting rod (364) is provided between the calibration arc plates (363) and the central shaft (362). A plurality of positioning holes are provided on the central shaft (362). The calibration frame (361) is threadedly connected to a positioning bolt (365), and the screw of the positioning bolt (365) is inserted into the positioning hole.

2. The surface grinding equipment for steel-plastic composite pipes according to claim 1, characterized in that: The disc body (24) has multiple sliding grooves (241) arranged radially along the disc body (24). Each of the multiple sliding grooves (241) corresponds to a multiple of the grippers (25). The gripper base (251) is slidably connected within the sliding grooves (241). The disc body (24) is provided with a gripper adjustment assembly (26) for adjusting and locking the grippers (25) to move radially along the disc body (24). The gripper adjustment assembly (26) includes components arranged radially along the disc body (24) and rotatably connected at both ends to the disc body (24). The disc (24) has multiple lead screws (261), multiple nut assemblies mounted on the multiple lead screws (261), driven bevel gears (262) fixed to each lead screw (261), a cover (265) rotatably connected to the disc body (24), a disc gear (263) fixed to the cover (265), and a locking bolt (264) threaded to the cover (265). The disc body (24) has multiple locking holes (242) for the locking bolts (264) to be inserted into. The multiple driven bevel gears (262) mesh with the disc gears (263).

3. The surface grinding equipment for steel-plastic composite pipes according to claim 2, characterized in that: The number of external clamping cylinders (254) and the number of internal clamping cylinders (255) are both several. The piston rod of the external clamping cylinder (254) is fixed with an external clamping rubber pad (256), and the piston rod of the internal clamping cylinder (255) is fixed with an internal clamping rubber pad (257).

4. The surface grinding equipment for steel-plastic composite pipes according to claim 3, characterized in that: The rotating shaft (21) is fixed with an air supply line, which provides compressed air to the external pressure cylinder (254), the internal pressure cylinder (255), and the regulating cylinder (23). The air supply line is equipped with a rotary joint.

5. The surface grinding equipment for steel-plastic composite pipes according to claim 1, characterized in that: The frame (1) is equipped with a motor (5), which drives at least one of the shafts (21) to rotate.

6. The surface grinding equipment for steel-plastic composite pipes according to claim 1, characterized in that: The calibration frame (361) is rotatably connected to the frame (1) at both ends, and the second drive assembly (37) is a rotary cylinder mounted on the frame (1).

7. The surface grinding equipment for steel-plastic composite pipes according to claim 1, characterized in that: The calibration arc plate (363) has a countersunk hole, and a countersunk bolt threaded to the connecting rod (364) is provided in the countersunk hole.

8. The surface grinding equipment for steel-plastic composite pipes according to claim 1, characterized in that: The supporting mechanism (4) includes a supporting support (41), a supporting rod (42), and a supporting wheel (43) rotatably connected to the upper end of the supporting rod (42). The supporting support (41) has a vertically opened insertion hole. The lower end of the supporting rod (42) is inserted into the insertion hole. The supporting rod (42) has multiple threaded holes (44). The multiple threaded holes (44) are distributed at intervals along the vertical direction on the supporting rod (42). The supporting support (41) has a through hole. The through hole has an adjusting bolt (45) that passes through the through hole and is threaded into the threaded hole (44).

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