A hot dip plastic coating treatment system for the surface of plastic coated composite steel pipe

Abstract

The present invention discloses a hot-dip plastic coating treatment system for the surface of a plastic-coated composite steel pipe, comprising a base, a treatment box is arranged on the base, hydraulic rods are arranged on the bases on both sides of the treatment box, the output ends of the two hydraulic rods are respectively fixedly connected with L-shaped plates, the L-shaped plates are fixedly connected with card plates, the two sides of the treatment box are respectively provided with card slots matched with the card plates, the upper end of the card plates is fixedly connected with a top plate, and a rotating mechanism is arranged on one of the L-shaped plates. In the present invention, the position of the steel pipe is fixed by the tensioning assembly and the limiting mechanism, the drive motor drives the first disc to rotate, thereby driving the steel pipe to rotate around the axis of the first disc, and the chain is arranged, when the first disc rotates, the chain drives the roller to rotate, thereby causing the connecting rod to rotate, driving the steel pipe to rotate around the axis of the first disc and rotating at the same time, and throwing out the excess coating tumors on the steel pipe, thereby improving the performance of the steel pipe.

Description

Technical Field

[0001] The invention relates to the technical field of plastic-coated steel pipe processing, and in particular to a plastic-coated composite steel pipe surface hot-dip plastic coating processing system. Background Art

[0002] Plastic-coated steel pipe, also known as plastic-coated pipe, steel-plastic composite pipe, and plastic-coated composite steel pipe, has excellent corrosion resistance and relatively small friction resistance. The manufacturing of plastic-coated steel pipe refers to a steel pipe as the base, and a layer of plastic anti-corrosion layer is welded on the inner surface of the steel pipe bottom pipe through spraying, brushing, rolling, dipping, and suction processes, or a steel-plastic composite steel pipe with a plastic anti-corrosion layer welded on the inner and outer surfaces. The treated steel pipe has corrosion resistance and cold resistance, so that the steel pipe will not be damaged by the environment.

[0003] However, when hot dipping steel pipes, the following problems often occur due to the shortcomings of existing equipment: paint nodules often appear after the steel pipes are taken out after hot dipping, which are common paint traces like candle tears. Paint nodules affect the appearance of the steel pipes and also affect the performance of the steel pipes to a certain extent; common steel pipe hot dipping usually involves placing the steel pipes in the paint to soak them, and then taking them out after a period of time. This process may result in parts of the steel pipes that are not fully hot dipped, and the hot dip time is relatively long, affecting the overall manufacturing efficiency of the plastic-coated steel pipes. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problem and to propose a hot-dip plastic coating treatment system for the surface of a plastic-coated composite steel pipe.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A plastic-coated composite steel pipe surface hot-dip plastic coating treatment system, comprising a base, a treatment box is arranged on the base, hydraulic rods are arranged on the bases on both sides of the treatment box, the output ends of the two hydraulic rods are respectively fixedly connected with L-shaped plates, the L-shaped plates are fixedly connected with a clamping plate, the two sides of the treatment box are respectively provided with a clamping groove matched with the clamping plate, the upper end of the clamping plate is fixedly connected with a top plate, one of the L-shaped plates is provided with a rotating mechanism, the other L-shaped plate is provided with a limiting mechanism matched with the rotating mechanism, and a locking mechanism is arranged between the top plate and the treatment box;

[0007] The rotating mechanism includes a transmission shaft passing through the L-shaped plate, a protective cover is provided on the top plate, a driving motor is provided in the protective cover, the output end of the driving motor is coaxially fixedly connected with the transmission shaft, a connecting shaft passes through the L-shaped plate, the connecting shaft and the transmission shaft are transmitted through a transmission assembly, a disc 1 is fixedly connected to the end of the connecting shaft away from the transmission assembly, three connecting rods pass through the disc 1, and rollers are fixedly connected to the three connecting rods, a fixed wheel is sleeved on the outer side of the connecting shaft, the fixed wheel is fixedly connected to the L-shaped plate, a tensioning wheel 1 and a tensioning wheel 2 are rotatably connected to the side of the disc 1 close to the roller, the fixed wheel, the tensioning wheel 1, the tensioning wheel 2 and the three rollers are connected by a chain, and tensioning assemblies are respectively provided at the ends of the three connecting rods away from the rollers;

[0008] The tensioning assembly comprises a sleeve mounted on the connecting rod, one end of the sleeve is fixedly connected to a collar, an end of the collar away from the sleeve is provided with a slide groove, a tensioning plate is slidably connected in the slide groove, a through groove is provided on the connecting rod, a fixing block is fixedly connected to the inner side of the tensioning plate, a rotating rod is rotatably connected to the fixing block, one end of the rotating rod away from the fixing block is rotatably connected to the inner side wall of the through groove, a fixing ring is fixedly connected to the connecting rod, a spring is provided between the fixing ring and the sleeve, and two ends of the spring abut against the fixing ring and the sleeve;

[0009] The limiting mechanism comprises a hydraulic cylinder fixedly connected to the L-shaped plate, the output end of the hydraulic cylinder is rotatably connected to a coaxially arranged disc 2, and the disc 2 is rotatably connected to three tapered rods.

[0010] Preferably, the locking mechanism comprises a fixed plate, a notch 1, a slide groove 2, a sliding seat, an elastic telescopic member, a connecting plate, a guide groove, a notch 2, a guide rod, an electric telescopic rod and a limit block, the lower end of the top plate is fixedly connected to the fixed plate, a notch 1 is provided on one side of the fixed plate, a slide groove 2 is provided on the outer side wall of the processing box, the sliding seat is slidably connected in the slide groove 2, an elastic telescopic member is provided inside the slide groove 2, the sliding seat is rotatably connected with a connecting plate, a guide groove is provided on the connecting plate, the guide rod is fixedly connected on the outer side wall of the processing box, the guide rod is slidably connected to the guide groove, a notch 2 is provided on one side of the connecting plate that matches the fixed plate, the electric telescopic rod is fixedly connected to the top of the notch 2, and the lower end of the electric telescopic rod is fixedly connected to the limit block.

[0011] Preferably, the elastic telescopic part includes a sliding rod, a sleeve rod and spring 2, one end of the sliding rod is embedded in the open end of the sleeve rod, and spring 2 is provided inside the sleeve rod, the two ends of the spring 2 are respectively fixedly connected to one end of the sliding rod and the inner bottom surface wall of the sleeve rod, the other end of the sliding rod is fixedly connected to the sliding seat, and the sleeve rod is fixedly connected to the inner bottom surface wall of the slide groove 2 at one end away from the sliding rod.

[0012] Preferably, the guide groove comprises a first vertical groove, an inclined groove and a second vertical groove, and two ends of the inclined groove are respectively connected to the first vertical groove and the second vertical groove.

[0013] Preferably, the transmission assembly includes a gearbox, bevel gear one and bevel gear two, the gearbox is fixedly connected to the L-shaped plate, the lower end of the transmission shaft extends into the interior of the gearbox and is fixedly connected to the coaxially arranged bevel gear one, one end of the connecting shaft extends into the interior of the gearbox and is fixedly connected to the coaxially arranged bevel gear two, and the bevel gear one and bevel gear two are meshingly connected.

[0014] Preferably, the tensioning assemblies are arranged in one-to-one correspondence with the conical rods, the three connecting rods are arranged in a ring-shaped and equidistant manner about the axis of disk one, the three conical rods are arranged in a ring-shaped and equidistant manner about the axis of disk two, and each tensioning assembly is provided with two tensioning plates, which are symmetrically arranged about the axis of the connecting rod.

[0015] Preferably, a liquid drain port is provided on the processing box, and a sealing ring matching the processing box is fixedly connected to the lower end of the top plate.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] 1. The present application achieves the fixation of the position of the steel pipe by cooperating with the tensioning assembly and the limiting mechanism, and drives the disc one to rotate by the driving motor, thereby driving the steel pipe to rotate around the axis of the disc one. Through the setting of the chain, when the disc one rotates, the chain drives the roller to rotate, thereby causing the connecting rod to rotate, driving the steel pipe to rotate around the axis of the disc one and rotate at the same time, thereby throwing off the excess paint tumors on the steel pipe, improving the aesthetics of the steel pipe, and also improving the performance of the steel pipe.

[0018] 2. The present application sets a rotating mechanism and a limiting mechanism so that the steel pipe rotates around the axis of the disc 1 and rotates at the same time, ensuring that the steel pipe always keeps rotating during hot dip, so that all parts of the outer surface of the steel pipe are evenly hot dipped, further improving the performance of the steel pipe.

[0019] 3. The present application is provided with a locking mechanism. After the top plate abuts against the upper end of the processing box, the top plate and the processing box are locked by the locking mechanism. By setting a sealing ring and cooperating between the clamping plate and the clamping groove, the inside of the processing box maintains a relatively closed environment when the steel pipe is hot dipped, thereby reducing heat loss and external interference, thereby improving the manufacturing efficiency of the steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It shows a schematic diagram of the overall structure of a hot dip plastic coating processing system provided in an embodiment of the present invention;

[0021] Figure 2It shows a schematic structural diagram of a rotating mechanism and a limiting mechanism provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of a top plate and a sealing ring provided in an embodiment of the present invention is shown;

[0023] Figure 4 A schematic diagram of the structure of a transmission assembly according to an embodiment of the present invention is shown;

[0024] Figure 5 A schematic diagram of a chain structure provided in an embodiment of the present invention is shown;

[0025] Figure 6 A schematic structural diagram of a tensioning assembly provided according to an embodiment of the present invention is shown;

[0026] Figure 7 An exploded view of the tensioning assembly structure provided according to an embodiment of the present invention is shown;

[0027] Figure 8 A schematic diagram of the tensioning plate structure provided according to an embodiment of the present invention is shown;

[0028] Fig. 9 A schematic diagram of the structure of a limiting mechanism provided in an embodiment of the present invention is shown;

[0029] Fig.10 It shows a schematic structural diagram of a locking mechanism provided according to an embodiment of the present invention;

[0030] Fig.11 A schematic diagram of the structure of a connecting plate provided according to an embodiment of the present invention is shown;

[0031] Fig.12 An exploded view of the elastic telescopic member structure provided according to an embodiment of the present invention is shown.

[0032] Legend:

[0033] 1. Base; 2. Processing box; 3. Drain port; 4. Hydraulic rod; 5. L-shaped plate; 6. Card plate; 7. Card slot; 8. Top plate; 9. Transmission shaft; 10. Protective cover; 11. Drive motor; 12. Gear box; 13. Bevel gear 1; 14. Connecting shaft; 15. Bevel gear 2; 16. Disc 1; 17. Fixed wheel; 18. Connecting rod; 19. Roller; 20. Tensioner 1; 21. Tensioner 2; 22. Chain; 23. Sleeve; 24. Fixed ring; 25. Spring 1; 26. Ring; 27. Slide 1; 28. Tensioner Tightening plate; 29, through groove; 30, fixed block; 31, rotating rod; 32, hydraulic cylinder; 33, disc 2; 34, tapered rod; 35, fixed plate; 36, notch 1; 37, slide groove 2; 38, sliding seat; 39, elastic telescopic member; 3901, slide rod; 3902, sleeve rod; 3903, spring 2; 40, connecting plate; 41, guide groove; 4101, vertical groove 1; 4102, inclined groove; 4103, vertical groove 2; 42, notch 2; 43, guide rod; 44, electric telescopic rod; 45, limit block; 46, sealing ring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-12 , the present invention provides a technical solution:

[0036] A plastic-coated composite steel pipe surface hot-dip plastic coating treatment system, comprising a base 1, a treatment box 2 is arranged on the base 1, hydraulic rods 4 are arranged on the base 1 on both sides of the treatment box 2, the output ends of the two hydraulic rods 4 are respectively fixedly connected with L-shaped plates 5, the L-shaped plates 5 are fixedly connected with a clamping plate 6, the two sides of the treatment box 2 are respectively provided with a clamping groove 7 matched with the clamping plate 6, the upper end of the clamping plate 6 is fixedly connected with a top plate 8, one of the L-shaped plates 5 is provided with a rotating mechanism, the other L-shaped plate 5 is provided with a limiting mechanism matched with the rotating mechanism, and a locking mechanism is provided between the top plate 8 and the treatment box 2; the rotating The mechanism includes a transmission shaft 9 that passes through the L-shaped plate 5, a protective cover 10 is provided on the top plate 8, a driving motor 11 is provided in the protective cover 10, the output end of the driving motor 11 is coaxially fixedly connected to the transmission shaft 9, a connecting shaft 14 is passed through the L-shaped plate 5, the connecting shaft 14 and the transmission shaft 9 are transmitted through a transmission assembly, a disc 16 is fixedly connected to the end of the connecting shaft 14 away from the transmission assembly, three connecting rods 18 are passed through the disc 16, and the three connecting rods 18 are fixedly connected to rollers 19, a fixed wheel 17 is sleeved on the outer side of the connecting shaft 14, and the fixed wheel 17 is fixed to the L-shaped plate 5 The disk 16 is rotatably connected to the side of the roller 19 with a tensioning wheel 1 20 and a tensioning wheel 2 21. The fixed wheel 17, the tensioning wheel 1 20, the tensioning wheel 2 21 and the three rollers 19 are connected by a chain 22. The ends of the three connecting rods 18 away from the roller 19 are respectively provided with tensioning assemblies; the tensioning assembly includes a sleeve 23 sleeved on the connecting rod 18, one end of the sleeve 23 is fixedly connected with a collar 26, and the end of the collar 26 away from the sleeve 23 is provided with a slide groove 1 27, and a tensioning plate 28 is slidably connected in the slide groove 1 27. The connecting rod 18 is provided with a through groove 29 A fixed block 30 is fixedly connected to the inner side of the tensioning plate 28, and a rotating rod 31 is rotatably connected to the fixed block 30. The end of the rotating rod 31 away from the fixed block 30 is rotatably connected to the inner wall of the through groove 29. A fixing ring 24 is fixedly connected to the connecting rod 18, and a spring 25 is provided between the fixing ring 24 and the sleeve 23. Both ends of the spring 25 abut against the fixing ring 24 and the sleeve 23; the limiting mechanism includes a hydraulic cylinder 32 fixedly connected to the L-shaped plate 5, and the output end of the hydraulic cylinder 32 is rotatably connected to a coaxially arranged disc 2 33, and three conical rods 34 are rotatably connected to the disc 2 33. The position of the steel pipe is fixed by cooperating with the tensioning assembly and the limiting mechanism. The drive motor 11 drives the disc 16 to rotate, thereby driving the steel pipe to rotate around the axis of the disc 16. The outer circumferences of the roller 19, the tensioning wheel 20, the tensioning wheel 21 and the fixed wheel 17 are all provided with grooves matching the chain 22. Through the setting of the chain 22, when the disc 16 rotates, the chain 22 drives the roller 19 to rotate, thereby causing the connecting rod 18 to rotate, driving the steel pipe to rotate around the axis of the disc 16 and rotate at the same time, and throwing out the excess paint tumors on the steel pipe, thereby improving the aesthetics of the steel pipe and also improving the performance of the steel pipe.

[0037] Specifically, Fig.10 , Fig.11 and Fig.12 As shown, the locking mechanism includes a fixed plate 35, a notch 36, a second slide groove 37, a sliding seat 38, an elastic telescopic member 39, a connecting plate 40, a guide groove 41, a second notch 42, a guide rod 43, an electric telescopic rod 44 and a limit block 45. The lower end of the top plate 8 is fixedly connected to the fixed plate 35, a notch 36 is provided on one side of the fixed plate 35, a second slide groove 37 is provided on the outer wall of the processing box 2, a sliding seat 38 is slidably connected in the second slide groove 37, an elastic telescopic member 39 is provided inside the second slide groove 37, a connecting plate 40 is rotatably connected to the sliding seat 38, a guide groove 41 is provided on the connecting plate 40, a guide rod 43 is fixedly connected to the outer wall of the processing box 2, the guide rod 43 is slidably connected to the guide groove 41, a notch 42 matching the fixed plate 35 is provided on one side of the connecting plate 40, an electric telescopic rod 44 is fixedly connected to the top of the second notch 42, and a limit block 45 is fixedly connected to the lower end of the electric telescopic rod 44. The guide slot 41 includes a vertical slot 1 4101, an inclined slot 4102 and a vertical slot 2 4103, and the two ends of the inclined slot 4102 are respectively connected to the vertical slot 1 4101 and the vertical slot 2 4103. When the guide rod 43 is located in the vertical slot 2 4103, the connecting plate 40 is in a deflected state, and when the guide rod 43 is located in the vertical slot 1 4101, the connecting plate 40 is in a vertical state. At this time, the upper end of the connecting plate 40 is just inserted into the notch 1 36, and the lower end of the fixing plate 35 is just inserted into the notch 2 42. When the guide rod 43 passes through the inclined slot 4102, the state of the connecting plate 40 will change, and each time the guide rod 43 passes through the inclined slot 4102, the connecting plate 40 will switch between the deflected state and the vertical state. After the top plate 8 abuts against the upper end of the processing box 2, the top plate 8 and the processing box 2 are locked by a locking mechanism, and through the cooperation of the clamping plate 6 and the clamping slot 7, the inside of the processing box 2 maintains a relatively closed environment when the steel pipe is hot-dipped, thereby reducing heat loss and external interference, thereby improving the manufacturing efficiency of the steel pipe.

[0038] Specifically, Fig.10 and Fig.12As shown, the elastic telescopic member 39 includes a slide bar 3901, a sleeve bar 3902 and a second spring 3903. One end of the slide bar 3901 is embedded in the open end of the sleeve bar 3902. The second spring 3903 is arranged inside the sleeve bar 3902. The two ends of the second spring 3903 are respectively fixedly connected to one end of the slide bar 3901 and the inner bottom surface wall of the sleeve bar 3902. The other end of the slide bar 3901 is fixedly connected to the slide seat 38. The end of the sleeve bar 3902 away from the slide bar 3901 is fixedly connected to the inner bottom surface wall of the second slide groove 37. The arrangement of the elastic telescopic member 39 enables the elastic telescopic member 39 to drive the slide seat 38 and the connection plate 40 to move when the connection plate 40 is separated from the fixed plate 35, so that the slide seat 38 remains at the upper end of the second slide groove 37, and the connection plate 40 is deflected due to the restriction of the guide rod 43, so as to prevent the fixed plate 35 from directly contacting the upper end of the connection plate 40 when it moves down next time, and cannot enter the second notch 42.

[0039] Specifically, Figure 2 , Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, the transmission assembly includes a gearbox 12, a bevel gear 13 and a bevel gear 2 15. The gearbox 12 is fixedly connected to the L-shaped plate 5. The lower end of the transmission shaft 9 extends into the gearbox 12 and is fixedly connected to the coaxially arranged bevel gear 13. One end of the connecting shaft 14 extends into the gearbox 12 and is fixedly connected to the coaxially arranged bevel gear 2 15. The bevel gear 13 and the bevel gear 2 15 are meshed and connected. The tensioning assembly is arranged one by one with the tapered rods 34. The three connecting rods 18 are arranged in an annular manner with equal distances about the axis of the disk 16. The three tapered rods 34 are arranged in an annular manner with equal distances about the axis of the disk 2 33. Each tensioning assembly is provided with two tensioning plates 28, and the two tensioning plates 28 are symmetrically arranged about the axis of the connecting rod 18. A rubber pad is provided on the outside of the tensioning plate 28. When the tensioning plate 28 moves outward and abuts against the inner wall of the steel pipe, the setting of the rubber pad can prevent the tensioning plate 28 from causing damage to the steel pipe when fixing the position of the steel pipe. At the same time, the two tensioning plates 28 move synchronously, so that the axis of the steel pipe always remains coincident with the axis of the connecting rod 18, ensuring the stability of the steel pipe during rotation and self-rotation.

[0040] Specifically, Figure 1 , Figure 2 and Figure 3 As shown, the processing box 2 is provided with a drain port 3, and the lower end of the top plate 8 is fixedly connected with a sealing ring 46 that matches the processing box 2. After the steel pipe is finished with hot-dip coating, when the coating needs to be replaced, it is discharged through the drain port 3. The size of the sealing ring 46 matches the size of the inner side of the upper end of the processing box 2. After the top plate 8 abuts against the processing box 2, the sealing ring 46 and the cooperation of the clamping plate 6 and the clamping groove 7 form a relatively closed environment inside the processing box 2, providing a good processing condition for the steel pipe.

[0041] In summary, the hot-dip plastic coating treatment system for the surface of a plastic-coated composite steel pipe provided in this embodiment, when in use, first add the coating into the treatment box 2, set one end of the steel pipe on the outside of the tensioning assembly, and use the hydraulic cylinder 32 to push the disc 2 33 and the tapered rod 34 toward the direction of the disc 1 16 until they are in contact with the other end of the steel pipe, push the steel pipe to move, and push the ring 26 and the sleeve 23 through the steel pipe, so that the spring 1 25 is compressed. At the same time, due to the relative sliding of the ring 26 and the connecting rod 18, the tensioning plate 28 is driven to move accordingly, and the tensioning plate 28 and the through groove 29 slide relative to each other. The rotation of the rotating rod 31 lifts the tensioning plates 28 on both sides of the connecting rod 18, so that the two tensioning plates 28 move away from the connecting rod 18 respectively, thereby supporting the steel pipe from the inside of the steel pipe to fix the position of the steel pipe, and the hydraulic rod 4 drives the top plate 8 and the steel pipe to move down until the top plate 8 abuts against the upper end of the processing box 2, and the clamping plate 6 is clamped into the clamping groove 7 to achieve the initial closure of the processing box 2, and the driving motor 11 is started to drive the transmission shaft 9 to rotate, and the connection shaft 14 is driven to rotate through the transmission of the bevel gear 1 13 and the bevel gear 2 15, so that the disc 1 16 rotates, driving the steel pipe around the disc The axis of the disc 16 rotates, and the disc 16 rotates to make the chain 22 and the fixed wheel 17 move relative to each other. Since the fixed wheel 17 is fixed, the chain 22 moves, pulling the roller 19, the tensioning wheel 120 and the tensioning wheel 21 to rotate. The rotation of the roller 19 drives the connecting rod 18 to rotate, so that the steel pipe rotates around the axis of the disc 16 and also rotates. When the top plate 8 moves down and abuts against the processing box 2, the fixed plate 35 moves down and contacts the connecting plate 40. The lower end of the fixed plate 35 contacts the inner bottom surface wall of the notch 2 42, thereby driving the connecting plate 40 to move down, so that The guide rod 43 slides in the guide groove 41, and enters the vertical groove 1 4101 from the vertical groove 2 4103 through the inclined groove 4102, so that the connecting plate 40 rotates, and the upper end of the connecting plate 40 moves into the notch 1 36. The downward movement of the connecting plate 40 drives the sliding seat 38 to slide in the slide groove 2 37, so that the sliding rod 3901 and the sleeve rod 3902 move relative to each other, so that the spring 2 3903 is compressed. When the top plate 8 moves down and abuts against the processing box 2, the limit block 45 is driven downward by the electric telescopic rod 44 to press the inner bottom surface wall of the notch 1 36, thereby achieving further closure of the processing box 2.

[0042] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system for hot-dip plastic coating treatment of the surface of a plastic-coated composite steel pipe, comprising a base (1), characterized in that: A processing box (2) is provided on the base (1), and hydraulic rods (4) are provided on the bases (1) on both sides of the processing box (2), and the output ends of the two hydraulic rods (4) are respectively fixedly connected to L-shaped plates (5), and the L-shaped plates (5) are fixedly connected to a clamping plate (6), and the two sides of the processing box (2) are respectively provided with clamping grooves (7) that match the clamping plate (6), and the upper end of the clamping plate (6) is fixedly connected to a top plate (8), one of the L-shaped plates (5) is provided with a rotating mechanism, and the other L-shaped plate (5) is provided with a limiting mechanism that matches the rotating mechanism, and a locking mechanism is provided between the top plate (8) and the processing box (2); The rotating mechanism comprises a transmission shaft (9) passing through the L-shaped plate (5); a protective cover (10) is provided on the top plate (8); a driving motor (11) is provided in the protective cover (10); an output end of the driving motor (11) is coaxially fixedly connected to the transmission shaft (9); a connecting shaft (14) passes through the L-shaped plate (5); transmission is transmitted between the connecting shaft (14) and the transmission shaft (9) via a transmission assembly; a disc 1 (16) is fixedly connected to one end of the connecting shaft (14) away from the transmission assembly; and three connecting rods (11) pass through the disc 1 (16). 8), rollers (19) are fixedly connected to the three connecting rods (18), a fixed wheel (17) is sleeved on the outer side of the connecting shaft (14), the fixed wheel (17) is fixedly connected to the L-shaped plate (5), a tensioning wheel (20) and a tensioning wheel (21) are rotatably connected to the side of the disc (16) close to the roller (19), the fixed wheel (17), the tensioning wheel (20), the tensioning wheel (21) and the three rollers (19) are connected by a chain (22), and tensioning components are respectively provided at the ends of the three connecting rods (18) away from the rollers (19); The tensioning assembly comprises a sleeve (23) sleeved on the connecting rod (18), one end of the sleeve (23) is fixedly connected to a collar (26), an end of the collar (26) away from the sleeve (23) is provided with a slide groove (27), a tensioning plate (28) is slidably connected in the slide groove (27), a through groove (29) is provided on the connecting rod (18), a fixed block (30) is fixedly connected to the inner side of the tensioning plate (28), a rotating rod (31) is rotatably connected to the fixed block (30), an end of the rotating rod (31) away from the fixed block (30) is rotatably connected to the inner side wall of the through groove (29), a fixing ring (24) is fixedly connected to the connecting rod (18), a spring (25) is provided between the fixing ring (24) and the sleeve (23), and two ends of the spring (25) are in contact with the fixing ring (24) and the sleeve (23); The limiting mechanism comprises a hydraulic cylinder (32) fixedly connected to the L-shaped plate (5), the output end of the hydraulic cylinder (32) being rotatably connected to a coaxially arranged disc 2 (33), and the disc 2 (33) being rotatably connected to three conical rods (34); The transmission assembly comprises a gear box (12), a bevel gear 1 (13) and a bevel gear 2 (15); the gear box (12) is fixedly connected to the L-shaped plate (5); the lower end of the transmission shaft (9) extends into the interior of the gear box (12) and is fixedly connected to the coaxially arranged bevel gear 1 (13); one end of the connecting shaft (14) extends into the interior of the gear box (12) and is fixedly connected to the coaxially arranged bevel gear 2 (15); the bevel gear 1 (13) and the bevel gear 2 (15) are meshingly connected; The tensioning assemblies are arranged in one-to-one correspondence with the tapered rods (34); the three connecting rods (18) are arranged in an annular manner with equal distances about the axis of the first disk (16); the three tapered rods (34) are arranged in an annular manner with equal distances about the axis of the second disk (33); and each tensioning assembly is provided with two tensioning plates (28), which are symmetrically arranged about the axis of the connecting rod (18).

2. A plastic-coated composite steel pipe surface hot-dip plastic coating treatment system according to claim 1, characterized in that: The locking mechanism comprises a fixed plate (35), a notch 1 (36), a second slide groove (37), a sliding seat (38), an elastic telescopic member (39), a connecting plate (40), a guide groove (41), a second notch (42), a guide rod (43), an electric telescopic rod (44) and a limit block (45); the lower end of the top plate (8) is fixedly connected to the fixed plate (35); a notch 1 (36) is provided on one side of the fixed plate (35); a second slide groove (37) is provided on the outer wall of the processing box (2); a sliding seat (38) is slidably connected to the second slide groove (37); the slide groove An elastic telescopic member (39) is provided inside the second (37), a connecting plate (40) is rotatably connected to the sliding seat (38), a guide groove (41) is provided on the connecting plate (40), a guide rod (43) is fixedly connected to the outer wall of the processing box (2), the guide rod (43) is slidably connected to the guide groove (41), a notch (42) matching with the fixed plate (35) is provided on one side of the connecting plate (40), an electric telescopic rod (44) is fixedly connected to the top of the notch (42), and a limit block (45) is fixedly connected to the lower end of the electric telescopic rod (44).

3. A plastic-coated composite steel pipe surface hot-dip plastic coating treatment system according to claim 2, characterized in that: The elastic telescopic member (39) comprises a sliding rod (3901), a sleeve rod (3902) and a second spring (3903); one end of the sliding rod (3901) is embedded in the open end of the sleeve rod (3902); a second spring (3903) is arranged inside the sleeve rod (3902); two ends of the second spring (3903) are respectively fixedly connected to one end of the sliding rod (3901) and the inner bottom surface wall of the sleeve rod (3902); the other end of the sliding rod (3901) is fixedly connected to the sliding seat (38); and one end of the sleeve rod (3902) away from the sliding rod (3901) is fixedly connected to the inner bottom surface wall of the second slide groove (37).

4. A plastic-coated composite steel pipe surface hot-dip plastic coating treatment system according to claim 3, characterized in that: The guide groove (41) comprises a vertical groove 1 (4101), an inclined groove (4102) and a vertical groove 2 (4103), and two ends of the inclined groove (4102) are respectively connected to the vertical groove 1 (4101) and the vertical groove 2 (4103).

5. A plastic-coated composite steel pipe surface hot-dip plastic coating treatment system according to claim 1, characterized in that: The processing box (2) is provided with a liquid discharge port (3), and the lower end of the top plate (8) is fixedly connected to a sealing ring (46) that matches the processing box (2).

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