A polishing device for plastic-coated steel pipe production

Abstract

This invention discloses a grinding device for the production of plastic-coated steel pipes, including a base. A smoothing mechanism is provided on the outside of the base. The smoothing mechanism includes two support plates. The outer surface of one support plate is fixedly connected to the outer surface of the base. A slip ring is provided between the outer surfaces of the two support plates. An adjusting rod is fixedly connected at equal angles to the inner arc surface of the slip ring. A grinding plate is fixedly connected to the output end of the adjusting rod. The outer surface of the grinding plate is provided with coarse grinding zones, fine grinding zones, and precision grinding zones at equal intervals along the direction of movement. This invention relates to the field of plastic-coated steel pipe production technology and solves the problems of existing plastic-coated steel pipe grinding devices, which require reciprocating grinding to achieve the required precision, resulting in low actual efficiency. Furthermore, the rotation and grinding of the steel pipe operate independently, requiring adjustment of their operating speeds for different steel pipe specifications, which not only easily leads to grinding dead angles but also further reduces grinding efficiency.

Description

Technical Field

[0001] This invention relates to the field of plastic-coated steel pipe production technology, specifically a grinding device for plastic-coated steel pipe production. Background Technology

[0002] During the production of plastic-coated steel pipes, the surface needs to be ground to facilitate the welding of the anti-corrosion layer. However, traditional grinding devices cannot meet the grinding requirements of plastic-coated steel pipes of different specifications. A utility model with announcement number CN220388849U discloses a grinding device for the production of plastic-coated steel pipes, which includes an equipment platform, a length adjustment unit, a pipe rotation unit, and a grinding unit. It uses a diameter-adjustable hydraulic cylinder to clamp pipes of different diameters inside the pipe and rotate them for grinding. It has multiple application scenarios and high grinding efficiency.

[0003] Although this device has the advantages mentioned above, it still has the following drawbacks in practical use: 1) The grinding head of this device has a fixed grinding grit. Within the stroke of the unidirectional movement along the threaded rod, it is easy to fail to complete the required grinding accuracy, which leads to the need for reciprocating motion for grinding, thus causing a reduction in actual grinding efficiency. 2) The grinding head and rotating unit of this device work independently. Due to the influence of rotation speed and pipe outer diameter, there are problems such as grinding dead angles or prolonged grinding time, which reduces grinding efficiency. At the same time, the running speed of the two need to be adjusted separately for different specifications, which makes the actual grinding work time-consuming, laborious and cumbersome.

[0004] Therefore, improvements are needed to address the shortcomings of existing devices. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a grinding device for the production of plastic-coated steel pipes. This device solves the problems of existing plastic-coated steel pipe grinding devices, which require reciprocating grinding to achieve the required precision, resulting in low actual efficiency. Furthermore, the rotation and grinding of the steel pipe operate independently, requiring adjustments to their operating speeds for different steel pipe specifications. This not only easily leads to grinding dead angles but also further reduces grinding efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a grinding device for producing plastic-coated steel pipes, comprising a base, a smoothing mechanism on the outside of the base, the smoothing mechanism comprising two support plates, the outer surface of one support plate being fixedly connected to the outer surface of the base, a slip ring being provided between the outer surfaces of the two support plates, an adjusting rod being fixedly connected at equal angles to the inner arc surface of the slip ring, a grinding plate being fixedly connected to the output end of the adjusting rod, the outer surface of the grinding plate being provided with coarse grinding area, fine grinding area and fine grinding area at equal intervals along the direction of movement, two ear plates being fixedly connected to the outer surface of the slip ring, a ball screw and a slide rod being slidably connected through the bodies of the two ear plates respectively, one end of the slide rod being fixedly connected to the outer surface of one support plate, one end of the ball screw being rotatably connected through the body of one support plate, and the other ends of the slide rod and the ball screw being slidably connected through the body of the other support plate.

[0007] Preferably, a cylinder is fitted onto the other end of the ball screw, the outer surface of the cylinder is slidably connected to the body of another support plate, a groove is provided on the inner arc surface of the cylinder, a retaining plate is movably connected inside the groove, and the outer surface of the retaining plate is fixedly connected to the other end of the ball screw.

[0008] Preferably, the slip ring is provided with a clamping assembly, which includes two round shafts. The outer surface of one round shaft is rotatably connected to the body of a support plate, and one end of the other round shaft is rotatably embedded in the outer surface of another support plate. Clamping plates are provided on the outer surfaces of the two round shafts that are close to each other. Abutment plates are fixedly connected to the outer surfaces of the clamping plates on both sides. A telescopic rod is fixedly connected to the outer surface of the clamping plate on the other side. The outer surface of the telescopic rod is fixedly embedded in the outer surface of the other round shaft. A drive motor is fixedly connected to the other end of the other round shaft. The output end of the drive motor is rotatably embedded in the body of another support plate, and the outer surface of the drive motor is fixedly connected to the outer surface of the other support plate.

[0009] Preferably, another of the circular shafts is provided with a slide rail on its outside, the outer surface of the slide rail is fixedly connected to the outer surface of the base, a slider is slidably connected to the outer surface of the slide rail, and the outer surface of the slider is fixedly connected to the outer surface of another support plate.

[0010] Preferably, a control unit is provided on the outside of one side of the clamping plate. The control unit includes two sets of sliding grooves, which are respectively opened on both sides of the outer surface of a round shaft. Sliding rods are slidably connected inside the sliding grooves. One end of one set of sliding rods is fixedly connected to an arc wheel, and one end of the other set of sliding rods is fixedly connected to the outer surface of one side of the clamping plate. The other end of both sets of sliding rods is threadedly connected to a screw. One end of the screw is rotatably connected to the body of a round shaft. Worm gears are fixedly connected to the outer surfaces of the screws on both sides. A dual-axis motor is fixedly connected to the body of one round shaft. Worms are fixedly connected to the output ends on both sides of the dual-axis motor through couplings. The outer surfaces of the worms on both sides mesh with the outer surfaces of the worm wheels on both sides.

[0011] Preferably, the outer surface of the arc wheel is connected to a synchronous belt, the outer surface of the synchronous belt is connected to a synchronous pulley, and the body of the synchronous pulley is fixedly connected to one end of the ball screw.

[0012] Preferably, a tensioning module is provided on the outside of the synchronous belt. The tensioning module includes a grooved plate, the outer surface of which is fixedly connected to the outer surface of a support plate. A connecting block is slidably connected inside the grooved plate. An auxiliary wheel is rotatably connected to the outer surface of the connecting block. The outer surface of the auxiliary wheel is drively connected to the outer surface of the synchronous belt. A support rod is slidably connected through the body of the connecting block. Both ends of the support rod are fixedly connected to the inside of the grooved plate. A tension spring is sleeved on the outside of the support rod. Both ends of the tension spring are fixedly connected to the inside of the grooved plate and the outer surface of the connecting block, respectively.

[0013] Preferably, a magnetic ring is sleeved on the outside of the support rod, the outer surface of the magnetic ring is fixedly connected to the outer surface of the connecting block, and an electromagnet is movably connected to the outside of the magnetic ring by magnetic force, the outer surface of the electromagnet is fixedly connected to the inside of the slot plate.

[0014] Beneficial effects This invention provides a grinding device for the production of plastic-coated steel pipes. Compared with the prior art, it has the following advantages: (1) By setting up a smooth surface mechanism and setting up multiple sets of grinding plates at equal angles around the plastic-coated steel pipe, the grinding range of a single grinding plate is reduced, so that the outer arc surface of the plastic-coated steel pipe is more easily ground completely when the grinding plate rotates during axial movement, thereby avoiding the problem of grinding dead angles and reducing the difficulty of matching the independent movement speed of the grinding plate and the plastic-coated steel pipe. At the same time, since the grinding plate is set with coarse grinding area, fine grinding area and fine grinding area respectively, the outer arc surface of the plastic-coated steel pipe can be coarsely ground, finely ground and finely ground in sequence during axial movement, so that the grinding plate can complete the grinding requirements of the plastic-coated steel pipe within a single movement stroke, thereby further improving the grinding efficiency and reducing the grinding difficulty.

[0015] (2) By setting up a clamping assembly, the two round shafts provide support, and the clamping plate on the outside of the round shaft is radially slidable to achieve internal clamping of plastic-coated steel pipes of different specifications. At the same time, one of the support plates slides with the slider. By adjusting the distance between the two support plates, the two ends of the plastic-coated steel pipe are respectively sleeved on the outside of the two circumferences, which facilitates the loading and unloading and clamping of the plastic-coated steel pipe. In addition, by using the cooperation of the cylinder, the slot and the clamping plate, the support of the ball screw is maintained during the movement of the support plate, thus ensuring the stability and accuracy of the grinding.

[0016] (3) By setting up a joint control unit, the radial adjustment of the arc wheel and the corresponding side clamp plate in the same direction is used to make the outer diameter of the arc wheel support inversely proportional to the specification of the plastic-coated steel pipe. Then, through the transmission of the synchronous belt, arc wheel and synchronous wheel, the operation of the plastic-coated steel pipe and the grinding plate can be interconnected, and the speed of the two can be adaptively matched. This not only reduces the difficulty of adaptation and adjustment, but also further improves the grinding efficiency and grinding accuracy, so as to avoid the problem of grinding dead angles.

[0017] (4) By setting up a tensioning module, the auxiliary wheel is connected to the synchronous belt through transmission, and the elastic force of the tension spring is used to make the auxiliary wheel tension the synchronous belt, thereby ensuring the stability of the movement of the plastic-coated steel pipe and the grinding plate. Furthermore, by using the magnetic force of the magnetic ring and the electromagnet, as well as the sliding adjustment of the connecting block inside the groove plate, the position of the synchronous auxiliary wheel can change when the arc wheel is radially adjusted, thus ensuring the real-time tensioning of the synchronous belt and avoiding the problem of the synchronous belt becoming unconnected. Attached Figure Description

[0018] Figure 1 This is a perspective view of the external structure of the present invention; Figure 2 This is a perspective view of the external structure of the grinding plate of the present invention; Figure 3 This is a perspective view of the internal structure of the cylinder of the present invention; Figure 4 This is a perspective view of the external structure of the telescopic rod of the present invention; Figure 5 This is a perspective view of the internal structure of the circular shaft of the present invention; Figure 6 This is a three-dimensional view of the internal structure of the groove plate of the present invention.

[0019] In the diagram: 1. Base; 2. Support plate; 3. Slip ring; 4. Clamping assembly; 41. Round shaft; 42. Clamping plate; 43. Support plate; 44. Control unit; 441. Slide groove; 442. Arc wheel; 443. Screw; 444. Worm gear; 445. Dual-axis motor; 446. Worm; 447. Synchronous belt; 448. Tensioning module; 4481. Groove plate; 4482. Connecting block; 4483. Auxiliary wheel; 4484. Support rod; 4485. Tension spring; 4486. Magnetic ring; 4487. Electromagnet; 449. Synchronous pulley; 4410. Slide bar; 45. Telescopic rod; 46. Drive motor; 47. Slide rail; 48. Slider; 5. Adjusting rod; 6. Grinding plate; 7. Ear plate; 8. Ball screw; 9. Slide rod; 10. Cylinder; 11. Slot; 12. Clamping plate. Detailed Implementation

[0020] 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-6 This invention provides a technical solution: a grinding device for the production of plastic-coated steel pipes. The system includes a base 1, with a smoothing mechanism on its exterior. This mechanism comprises two support plates 2. The outer surface of one support plate 2 is fixedly connected to the outer surface of the base 1. A slip ring 3 is positioned between the outer surfaces of the two support plates 2. The inner diameter of the slip ring 3 is larger than the maximum specification of the plastic-coated steel pipe to be processed. An adjusting rod 5 is fixedly connected at equal angles to the inner arc surface of the slip ring 3. The adjusting rod 5 is made of an electric push rod and is electrically connected to an external control circuit. A grinding plate 6 is fixedly connected to the output end of the adjusting rod 5. The grinding plate 6 has a grinding area on its side facing the axis of the slip ring 3. It is adjusted by the extension and retraction of the adjusting rod 5 to fit against the outer arc surface of the plastic-coated steel pipe for grinding. The outer surface of the grinding plate 6 has evenly spaced grooves along the direction of movement. The grinding zones are coarse, fine, and high. Two ear plates 7 are fixedly connected to the outer surface of the slip ring 3. The ear plates 7 provide fixed support and limit guidance for the slip ring 3. The bodies of the two ear plates 7 are respectively slidably connected to a ball screw 8 and a slide rod 9. The ball screw 8 rotates in one direction, and its sliding end can drive the slip ring 3 to reciprocate axially through the corresponding ear plate 7. The slide rod 9 provides support, limit, and sliding guidance for the slip ring 3 through the corresponding ear plate 7. One end of the slide rod 9 is fixedly connected to the outer surface of a support plate 2. One end of the ball screw 8 is rotatably connected to the body of a support plate 2. The other ends of the slide rod 9 and the ball screw 8 are slidably connected to the body of another support plate 2.

[0022] The other end of the ball screw 8 is fitted with a cylinder 10. The outer surface of the cylinder 10 is slidably connected to the body of another support plate 2. The connection between the cylinder 10 and the corresponding support plate 2 is provided with axial limiting measures (including but not limited to bearings, not shown in the figure) to improve the stability of the connection. The inner arc surface of the cylinder 10 is provided with a groove 11. The groove 11 is movably connected with a locking plate 12. Multiple sets of locking plates 12 and grooves 11 are arranged at equal angles to improve the force and balance. At the same time, the axial sliding connection and radial locking action of the two facilitate the cylinder 10 and the opposing support plate 2 to slide along the axial direction of the ball screw 8, thereby adjusting the distance between the two support plates 2 to facilitate the loading and unloading of the plastic-coated steel pipe. The outer surface of the locking plate 12 is fixedly connected to the other end of the ball screw 8.

[0023] The slip ring 3 is externally equipped with a clamping assembly 4, which includes two round shafts 41. The outer surface of one round shaft 41 is rotatably connected to the body of a support plate 2. The connection between the round shaft 41 and the support plate 2 is provided with axial limiting measures to improve the stability of the connection and the force balance of the round shaft 41. One end of the other round shaft 41 is rotatably embedded in the outer surface of another support plate 2. The outer surfaces of the two round shafts 41 that are close to each other are provided with clamping plates 42. The clamping plates 42 achieve the clamping effect by abutting against the inner wall of the plastic-coated steel pipe. Multiple clamping plates are arranged at equal angles to improve the clamping balance. The outer surfaces of the clamping plates 42 on both sides are fixedly connected with abutment plates 43. The abutment plates 43 are connected by... The contact with the end of the plastic-coated steel pipe enhances its axial stability when clamping the plastic-coated steel pipe. A telescopic rod 45 is fixedly connected to the outer surface of the other side clamping plate 42. The telescopic rod 45 is made of electric push rod and is electrically connected to the external control circuit through a rotary electrical element. The rotary electrical element is set on the corresponding round shaft 41. The outer surface of the telescopic rod 45 is embedded and fixedly connected to the outer surface of another round shaft 41. The other end of the other round shaft 41 is fixedly connected to a drive motor 46. The drive motor 46 is electrically connected to the external control circuit. The output end of the drive motor 46 is embedded and rotatably connected to the body of another support plate 2. The outer surface of the drive motor 46 is fixedly connected to the outer surface of the other support plate 2.

[0024] Another circular shaft 41 is provided with a slide rail 47 on its outside. The outer surface of the slide rail 47 is fixedly connected to the outer surface of the base 1. A slider 48 is slidably connected to the outer surface of the slide rail 47. The slider 48 and the slide rail 47 are made of an existing linear motor device with a self-locking function and are electrically connected to an external control circuit. The outer surface of the slider 48 is fixedly connected to the outer surface of another support plate 2.

[0025] A control unit 44 is provided on the outside of one side clamping plate 42. The control unit 44 includes two sets of sliding grooves 441, which are respectively opened on both sides of the outer surface of a round shaft 41. Sliding strips 4410 are slidably connected inside the sliding grooves 441. The sliding grooves 441 limit and guide the movement of the sliding strips 4410, and also enclose and store them. The sliding strips 4410 have a rectangular cross-section to improve the stability of sliding inside the sliding grooves 441. One end of one set of sliding strips 4410 is fixedly connected to an arc wheel 442, which is composed of a hollow drive wheel. One end of the other set of sliding strips 4410 is fixedly connected to the outer surface of one side clamping plate 42. The other end of both sets of sliding strips 4410 is threadedly connected to a screw 443. The screw 443 is threadedly connected to the sliding strip 4410, utilizing... The forward and reverse rotation drives the slider 4410 to slide along the groove 441. One end of the screw 443 is embedded and rotatably connected to the body of a round shaft 41. Worm gears 444 are fixedly connected through the outer surfaces of both screws 443. The worm gears 444 and worms 446 not only play a transmission role, but also improve the stability of the slider 4410, thereby improving the force bearing capacity of the corresponding clamp 42 and the arc wheel 442. A dual-axis motor 445 is fixedly connected to the body of a round shaft 41. The dual-axis motor 445 is made of servo motor and is electrically connected to the external control circuit through a rotary electrical connection element. The rotary electrical connection element is set on the corresponding round shaft 41. Worms 446 are fixedly connected to the output ends of both sides of the dual-axis motor 445 through couplings. The outer surfaces of the worms 446 on both sides mesh with the outer surfaces of the worm gears 444 on both sides.

[0026] The outer surface of the arc wheel 442 is connected to a synchronous belt 447, and the outer surface of the synchronous belt 447 is connected to a synchronous pulley 449. The transmission action of the synchronous pulley 449 and the synchronous belt 447 enables the operation of the round shaft 41, the plastic-coated steel pipe, the ball screw 8, and the grinding plate 6 to be related. Furthermore, by utilizing the radial adjustment of the arc wheel 442, the running speed of the grinding plate 6 and the plastic-coated steel pipe can be adaptively matched. The body of the synchronous pulley 449 is fixedly connected to one end of the ball screw 8.

[0027] A tensioning module 448 is externally mounted on the synchronous belt 447. The tensioning module 448 includes a groove plate 4481, the inner and outer cross-sections of which are rectangular. The outer surface of the groove plate 4481 is fixedly connected to the outer surface of a support plate 2. A connecting block 4482 is slidably connected inside the groove plate 4481. The connecting block 4482 is rectangular and its external dimensions are adapted to the internal dimensions of the groove plate 4481 to ensure stable sliding inside the groove plate 4481. An auxiliary wheel 4483 is rotatably connected to the outer surface of the connecting block 4482. The shaft end of the auxiliary wheel 4483 is rotatably embedded in the outer surface of the connecting block 4482 and is provided with axial limiting measures to improve the stability of the auxiliary wheel 4483. At the same time, by sliding along with the connecting block 4482, it maintains the tension on the synchronous belt 447. The tensioning effect of 7, the outer surface of the auxiliary wheel 4483 is connected to the outer surface of the synchronous belt 447, the body of the connecting block 4482 is slidably connected to the support rod 4484, the length of the support rod 4484 is adapted to the length inside the groove plate 4481, which can further improve the force bearing capacity and sliding stability of the connecting block 4482. Both ends of the support rod 4484 are fixedly connected to the inside of the groove plate 4481. A tension spring 4485 is sleeved on the outside of the support rod 4484. The tension spring 4485 can adapt to the radial adjustment of the arc wheel 442 by its own elasticity, thereby maintaining the force balance and positional stability of the connecting block 4482 and the auxiliary wheel 4483. Both ends of the tension spring 4485 are fixedly connected to the inside of the groove plate 4481 and the outer surface of the connecting block 4482, respectively.

[0028] A magnetic ring 4486 is fitted around the outside of the support rod 4484. The magnetic ring 4486 is made of permanent magnet. The outer surface of the magnetic ring 4486 is fixedly connected to the outer surface of the connecting block 4482. An electromagnet 4487 is magnetically connected to the outside of the magnetic ring 4486. The electromagnet 4487 is electrically connected to the external control circuit. Through the magnetic repulsion between the electromagnet 4486 and the magnetic ring 4486, the pressure applied to the auxiliary pulley 4483 by the synchronous belt 447 during transmission can be offset, thereby further improving the positional stability of the auxiliary pulley 4483. The outer surface of the electromagnet 4487 is fixedly connected to the inside of the slot plate 4481.

[0029] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0030] During operation; for loading the plastic-coated steel pipe: First, the plastic-coated steel pipe to be ground is hoisted and moved using hoisting equipment. Then, the slider 48 moves along the slide rail 47, causing the corresponding support plate 2 to move, increasing the distance between the two support plates 2. Subsequently, the plastic-coated steel pipe is moved between the two support plates 2, and one end of the plastic-coated steel pipe is fitted onto the outside of the horizontally fixed round shaft 41. Then, the slider 48 moves in the opposite direction, causing the corresponding support plate 2 to reset, so that the corresponding round shaft 41 slides into the interior of the other end of the plastic-coated steel pipe. Then, the output end of the telescopic rod 45 extends and retracts, driving the corresponding clamping plate. 42 slides radially so that the corresponding clamping plate 42 abuts against the inner wall of the plastic-coated steel pipe, and the abutting plate 43 on the clamping plate 42 abuts against the end of the plastic-coated steel pipe. Then, the two output ends of the dual-axis motor 445 drive the two worm gears 446 to rotate synchronously. Through the meshing of the worm gears 446 and the worm wheel 444, the two sets of screws 443 rotate synchronously. Through the threaded connection between the screws 443 and the slide bar 4410, the two slide bars 4410 slide radially in opposite directions synchronously inside the slide groove 441, thereby clamping the plastic-coated steel pipe with the corresponding clamping plate 42. When the slider 4410 moves, it simultaneously drives the arc wheel 442 to perform radial adjustment. During the adjustment of the arc wheel 442, the relative position and shape of the synchronous belt 447 change. At the same time, the auxiliary wheel 4483 slides along the support rod 4484 inside the groove plate 4481, and the tension spring 4485 is stretched to different degrees to keep the synchronous belt 447 taut. Then, the output end of the adjusting rod 5 extends, driving the grinding plate 6 closer to the plastic-coated steel pipe. When the two are in contact, the output end of the adjusting rod 5 maintains its extension length to ensure stable contact. Once the plastic-coated steel pipe is fully clamped, the drive motor 46 drives the round shaft 41 to rotate, causing the plastic-coated steel pipe to rotate accordingly. Since the arc wheel 442 rotates with the round shaft 41, and through the transmission of the synchronous belt 447, the synchronous wheel 449 and the auxiliary wheel 4483 rotate synchronously. When the synchronous belt 447 applies pressure to the auxiliary wheel 4483, the electromagnet 4487 is energized and magnetized, and through the magnetic force of the magnetic ring 4486, it counteracts the pressure applied by the synchronous belt 447. Simultaneously, the synchronous wheel 449 drives the ball screw 8 to rotate synchronously. The sliding end of the ball screw 8 drives the slip ring 3 to slide through the corresponding ear plate 7. Due to the rotation of the plastic-coated steel pipe and the sliding of the grinding plate 6, its surface can be ground. Furthermore, by setting up coarse grinding, fine grinding, and precision grinding zones, the surface of the plastic-coated steel pipe can be ground to the required precision within a single stroke of the grinding plate 6, thus avoiding the cost and efficiency losses caused by repeated grinding.

[0031] 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 alterations 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 grinding device for producing plastic-coated steel pipes, comprising a base (1), characterized in that: The base (1) is provided with a smooth surface mechanism, which includes two support plates (2). The outer surface of one support plate (2) is fixedly connected to the outer surface of the base (1). A slip ring (3) is provided between the outer surfaces of the two support plates (2). An adjusting rod (5) is fixedly connected to the inner arc surface of the slip ring (3) at equal angles. A grinding plate (6) is fixedly connected to the output end of the adjusting rod (5). The outer surface of the grinding plate (6) is provided with a coarse grinding area, a fine grinding area and a fine grinding area at equal distances along the direction of movement. Two ear plates (7) are fixedly connected to the outer surface of the slip ring (3). The bodies of the two ear plates (7) are respectively slidably connected to a ball screw (8) and a slide rod (9). One end of the slide rod (9) is fixedly connected to the outer surface of one support plate (2). One end of the ball screw (8) is rotatably connected to the body of one support plate (2). The other ends of the slide rod (9) and the ball screw (8) are slidably connected to the body of the other support plate (2).

2. The grinding device for producing plastic-coated steel pipes according to claim 1, characterized in that: The other end of the ball screw (8) is fitted with a cylinder (10). The outer surface of the cylinder (10) is slidably connected to the body of another support plate (2). The inner arc surface of the cylinder (10) is provided with a slot (11). A retaining plate (12) is movably connected inside the slot (11). The outer surface of the retaining plate (12) is fixedly connected to the other end of the ball screw (8).

3. The grinding device for producing plastic-coated steel pipes according to claim 1, characterized in that: The slip ring (3) is provided with a clamping assembly (4) on its outside. The clamping assembly (4) includes two round shafts (41). The outer surface of one round shaft (41) is rotatably connected to the body of a support plate (2). One end of the other round shaft (41) is rotatably connected to the outer surface of another support plate (2). The two round shafts (41) are provided with clamping plates (42) on their outer sides. The outer surfaces of the clamping plates (42) on both sides are fixedly connected with abutment plates (43). The outer surface of the clamping plate (42) on the other side is fixedly connected with a telescopic rod (45). The outer surface of the telescopic rod (45) is fixedly connected to the outer surface of the other round shaft (41). The other end of the other round shaft (41) is fixedly connected with a drive motor (46). The output end of the drive motor (46) is rotatably connected to the body of another support plate (2). The outer surface of the drive motor (46) is fixedly connected to the outer surface of the other support plate (2).

4. The grinding device for producing plastic-coated steel pipes according to claim 3, characterized in that: Another circular shaft (41) is provided with a slide rail (47) on its outside. The outer surface of the slide rail (47) is fixedly connected to the outer surface of the base (1). A slider (48) is slidably connected to the outer surface of the slide rail (47). The outer surface of the slider (48) is fixedly connected to the outer surface of another support plate (2).

5. A grinding device for producing plastic-coated steel pipes according to claim 3, characterized in that: A control unit (44) is provided on the outside of one side of the clamping plate (42). The control unit (44) includes two sets of sliding grooves (441). The two sets of sliding grooves (441) are respectively opened on both sides of the outer surface of a round shaft (41). Sliding strips (4410) are slidably connected inside the two sets of sliding grooves (441). One end of one set of sliding strips (4410) is fixedly connected to an arc wheel (442), and one end of the other set of sliding strips (4410) is fixedly connected to the outer surface of one side of the clamping plate (42). The two sets of sliding strips (4410) The other end of each screw is threadedly connected to a screw (443). One end of the screw (443) is rotatably connected to the body of a round shaft (41). Worm gears (444) are fixedly connected to the outer surfaces of both screws (443). A dual-axis motor (445) is fixedly connected to the body of one round shaft (41). Worm gears (446) are fixedly connected to the output ends of both sides of the dual-axis motor (445) through couplings. The outer surfaces of the worm gears (446) on both sides mesh with the outer surfaces of the worm gears (444) on both sides respectively.

6. A grinding device for producing plastic-coated steel pipes according to claim 5, characterized in that: The outer surface of the arc wheel (442) is connected to a synchronous belt (447), and the outer surface of the synchronous belt (447) is connected to a synchronous pulley (449). The body of the synchronous pulley (449) is fixedly connected to one end of the ball screw (8).

7. A grinding device for producing plastic-coated steel pipes according to claim 6, characterized in that: The synchronous belt (447) is provided with a tensioning module (448) on its outside. The tensioning module (448) includes a groove plate (4481). The outer surface of the groove plate (4481) is fixedly connected to the outer surface of a support plate (2). A connecting block (4482) is slidably connected inside the groove plate (4481). An auxiliary wheel (4483) is rotatably connected to the outer surface of the connecting block (4482). The outer surface of the auxiliary wheel (4483) is drively connected to the outer surface of the synchronous belt (447). A support rod (4484) is slidably connected through the body of the connecting block (4482). Both ends of the support rod (4484) are fixedly connected to the inside of the groove plate (4481). A tension spring (4485) is sleeved on the outside of the support rod (4484). Both ends of the tension spring (4485) are fixedly connected to the inside of the groove plate (4481) and the outer surface of the connecting block (4482), respectively.

8. A grinding device for producing plastic-coated steel pipes according to claim 7, characterized in that: A magnetic ring (4486) is sleeved on the outside of the support rod (4484). The outer surface of the magnetic ring (4486) is fixedly connected to the outer surface of the connecting block (4482). An electromagnet (4487) is movably connected to the outside of the magnetic ring (4486) by magnetic force. The outer surface of the electromagnet (4487) is fixedly connected to the inside of the slot plate (4481).

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