A large-diameter welded pipe high-frequency extrusion device based on a counter roller

Abstract

The application discloses a large-diameter welded pipe high-frequency extrusion device based on a counter-arc roller and belongs to the technical field of welded pipe machining. The inner wall of an extrusion forming machine is provided with an equipment box, the surface of the equipment box is fixedly connected with a connecting plate, the outer wall of the connecting plate is boltedly connected with a motor, the output end of the motor is connected with a first gear through a long rod, the tail end of the long rod is fixedly connected with a second gear, and the front side of the connecting plate is connected with a rack through a reciprocating assembly. In the working process, the device box processes the feed from the feed position on the right side of the extrusion forming machine. In the working process, the scraper makes reciprocating linear motion in the horizontal direction, can quickly scrape off the welding slag on the surface of the workpiece, the cleaning plate is in a multi-directional cleaning state, the welding slag is more loose, the welding slag is conveniently discharged by the guide plate and the discharging plate, and the workpiece surface is free of welding slag.

Description

Technical Field

[0001] This invention relates to the field of welded pipe processing technology, specifically to a high-frequency extrusion device for large-diameter welded pipes based on a reverse arc roller. Background Technology

[0002] Welded pipes are pipes made by bending steel strips or plates and then welding them. They have the advantages of low cost, flexible specifications and long service life, and are widely used in construction, machinery and fluid transportation. In the process of welding pipe processing, a high-frequency extrusion device is required. In the high-frequency extrusion device, the reverse arc roller, with its arc-shaped profile of "concave in the middle and protruding at both ends", can disperse the pressure in the middle area of ​​the steel strip, so that the force is evenly distributed in the width direction. When the high-frequency extrusion device is working, the workpiece is extruded and shaped, and then the workpiece is welded together. For example, Chinese utility model patent application No. 202120219316.5, filed on January 26, 2021, discloses a stainless steel pipe welding device, which includes an extrusion mechanism, a correction mechanism, a spatial position adjustment mechanism, and a welding torch. During operation, the correction mechanism positions the coordinates of the weld seam and controls the spatial position adjustment mechanism to adjust the spatial position of the welding torch, ensuring that the central axis of the welding torch always intersects the center line of the weld seam, guaranteeing that the welding torch can uniformly weld the weld seam. Another example is Chinese utility model patent application No. 202120775514.X, filed on April 16, 2021, which discloses a five-roll extruder for high-frequency welded pipe forming, characterized by its simplified structure, compact appearance, and convenient, accurate, and quick installation and adjustment. Advantages: Applicable to high-frequency welded pipe extrusion with irregular cross-sections. Chinese utility model patent application No. 202120328024.5, filed on February 5, 2021, discloses a two-roller horizontal extrusion device for straight seam welded pipes with a buffer structure. During operation, the drive motor and first transmission wheel conveniently drive the second transmission wheel to rotate under the action of a belt. This, in turn, stably drives two rotating rods and extrusion rollers to rotate rapidly under the action of two gears and four bearings. Several extrusion blocks can quickly extrude straight seam pipes, resulting in fast extrusion speed and low energy consumption. Simultaneously, two buffer plates provide initial buffering when the straight seam pipe falls, and the elastic action of springs and telescopic rods further buffers the pipe, preventing damage during the fall and preventing excessive material from clogging the feed pipe.

[0003] When the high-frequency extrusion device is working, the sheet metal is first rolled by guide rollers, and then the butt joint is welded by high-frequency current. After that, the weld slag is cleaned. During the welding process, weld slag will be generated. If the weld slag is not cleaned quickly, the weld slag residue on the weld joint surface will hinder the tight bonding of the molten metal of the steel strip, which will lead to a decrease in the quality of the workpiece. However, the device in the above application does not have an efficient structure for cleaning weld slag during use. As a result, defects such as incomplete penetration and slag inclusion will occur during operation, which will significantly reduce the weld strength. This will affect the extrusion forming state of the workpiece, and ultimately lead to abnormal workpiece forming and low workpiece quality. Summary of the Invention

[0004] The purpose of this invention is to provide a high-frequency extrusion device for large-diameter welded pipes based on a reverse arc roller, so as to solve the problem mentioned in the background art that it does not have an efficient slag cleaning structure during use.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A high-frequency extrusion device for large-diameter welded pipes based on a reverse-arc roller includes an equipment box installed on the inner wall of an extrusion molding machine, a connecting plate fixedly connected to the surface of the equipment box, a motor bolted to the outer wall of the connecting plate, and a long pin rotatably connected to the surface of the connecting plate; the output end of the motor is connected to a first gear via a long rod, and a second gear is fixedly connected to the end of the long pin; a rack is connected to the front side of the connecting plate via a reciprocating assembly, and a scraper is fixedly connected to the lower surface of the rack; a fixing plate is fixedly connected to the side of the scraper, and a cleaning plate is connected to the inside of the fixing plate via a reversing assembly; a guide plate is fixedly connected to the end of the fixing plate, and a feeding plate is connected to the left side of the guide plate via a swing assembly; an inner plate is fixedly connected to the left side of the guide plate, and an airbag is bonded to the surface of the inner plate.

[0007] Preferably, both the first gear and the second gear are non-full gear structures, and the tooth blocks on the surface of the first gear are symmetrically distributed. The reciprocating assembly includes a limiting rod fixedly connected to the surface of the connecting plate.

[0008] Preferably, the rack is sleeved on the surface of the limiting rod, and the top view of the limiting rod is an inverted "L" structure.

[0009] Preferably, the reversing assembly includes a slide rod slidably disposed inside the fixed plate, and the cleaning plate is fixedly connected to both ends of the slide rod, and a force-bearing block is fixedly connected to the surface of the cleaning plate.

[0010] Preferably, a fixing block is fixedly connected to the surface of the connecting plate, and the surface of the fixing block and the surface of the force-bearing block are both arc-shaped structures, and the force-bearing blocks are evenly distributed on the surface of the cleaning plate.

[0011] Preferably, a spring damper that provides elastic reset is fixedly connected to the surface of the cleaning plate, and the other side of the spring damper is fixedly connected to the surface of the fixed plate.

[0012] Preferably, the swing assembly includes an auxiliary plate fixedly connected to the left side of the guide plate, and the auxiliary plate has an inner shaft rotatably arranged inside, and an auxiliary gear is fixedly connected to the surface of the inner shaft. Both sides of the guide plate are inclined, and the feeding plate is inclined.

[0013] Preferably, the surface of the connecting plate is fixedly connected to an inverted "L" shaped connecting rod, and the end of the connecting rod is fixedly connected to a lower connecting rod. The lower connecting rod is viewed from above as an inverted "U" shape. The surface of the lower connecting rod is evenly distributed with tooth blocks that mesh with the auxiliary gear. The surface of the inner shaft is fixedly connected to the feeding plate, and the feeding plates are symmetrically distributed on both sides of the guide plate.

[0014] Preferably, an air inhalation tube is fixedly connected to the upper surface of the airbag, and a side tube is fixedly connected to the side of the airbag. The surface of the airbag is in contact with the surface of the feed plate, and a connecting tube is fixedly connected to the surface of the feed plate. The airbag is initially in a compressed state.

[0015] Preferably, the surface of the feeding plate is provided with nozzles at equal intervals, the connecting pipe is connected to the side pipe through an external flexible hose, and the surface of the connecting pipe, the surface of the side pipe and the surface of the suction pipe are all provided with one-way valves.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The novel structural design, with a horizontally movable scraper, allows for rapid cleaning of weld slag, preventing it from affecting the workpiece forming and ensuring the quality of the workpiece forming. Simultaneously, the multi-directional cleaning plate further loosens the scraped slag, facilitating its processing by the guide plate and the unloading plate, ensuring no slag residue remains on the workpiece surface. This optimizes the workpiece extrusion forming effect. The specific details are as follows:

[0017] 1. The high-frequency extrusion device for large-diameter welded pipes based on the reverse arc roller feeds material through the feeding position on the right side of the extrusion molding machine during operation. The material is processed by the equipment box. During operation, the motor starts, and the rack drives the scraper to move in the horizontal direction under the action of the first gear, the second gear, and the limit rod. The scraper can then scrape off the welding slag on the surface of the weld, which facilitates the subsequent treatment of the welding slag.

[0018] 2. The high-frequency extrusion device for large-diameter welded pipe based on the reverse arc roller, when the scraper moves in the horizontal direction, will drive the cleaning plate to move synchronously in the horizontal direction through the fixed plate. At this time, the cleaning plate can clean the welding slag, play a role in dispersing the welding slag, making the welding slag looser, and thus making it easier to process the welding slag.

[0019] Furthermore, during the movement of the cleaning plate, the force-bearing blocks on the surface of the cleaning plate will be intermittently pushed by the fixed blocks. At this time, the force-bearing blocks and the cleaning plate will reciprocate linearly in the horizontal direction under the action of the slide rod and spring shock absorber. At this time, the cleaning plate has a multi-directional cleaning function, which optimizes the cleaning effect of welding slag.

[0020] 3. This high-frequency extrusion device for large-diameter welded pipes based on the reverse arc roller, when the scraper moves in the horizontal direction, will drive the guide plate to move synchronously through the fixed plate. The surface of the guide plate is inclined, which will cause the welding slag to concentrate on both sides of the workpiece and fall off. At the same time, when the guide plate moves, the feeding plate is in a swinging state under the action of the auxiliary gear and the lower connecting rod, so that the feeding plate can quickly push the welding slag down, resulting in high working efficiency.

[0021] Furthermore, during the oscillation of the unloading plate, the air bladder is intermittently compressed, and the air bladder supplies air to the unloading plate through the side pipe, external hose and connecting pipe. At this time, the unloading plate will spray air through the nozzle, which plays an auxiliary role in blowing air to unload the material and prevent welding slag from remaining. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the connection structure between the extrusion molding machine and the equipment box of the present invention;

[0023] Figure 2 This is a schematic diagram of the connection structure between the connecting plate and the motor of the present invention;

[0024] Figure 3 This is a schematic diagram of the connection structure between the connecting plate and the limiting rod of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection structure of the connecting plate and the long pin of the present invention;

[0026] Figure 5 This is a schematic diagram of the connection structure between the connecting plate and the fixing block of the present invention;

[0027] Figure 6 This is a schematic diagram of the force-bearing block distribution structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the connection structure between the guide plate and the inner plate of the present invention;

[0029] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point A in the middle;

[0030] Figure 9 This is a schematic diagram of the connection structure between the inner shaft and the auxiliary gear of the present invention;

[0031] Figure 10 This is a schematic diagram of the connection structure between the airbag and the inhalation tube of the present invention.

[0032] In the diagram: 1. Extrusion molding machine; 2. Equipment box; 3. Connecting plate; 4. Motor; 5. First gear; 6. Long pin; 7. Second gear; 8. Rack; 9. Limiting rod; 10. Scraper; 11. Fixing plate; 12. Slide rod; 13. Cleaning plate; 14. Spring shock absorber; 15. Fixing block; 16. Force-bearing block; 17. Connecting rod; 18. Guide plate; 19. Lower connecting rod; 20. Auxiliary plate; 21. Inner shaft; 22. Auxiliary gear; 23. Feeding plate; 24. Airbag; 25. Inner plate; 26. Suction pipe; 27. Side pipe; 28. Connecting pipe. Detailed Implementation

[0033] 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.

[0034] Please see Figures 1-10 The present invention provides the following technical solution: a high-frequency extrusion device for large-diameter welded pipes based on a reverse arc roller.

[0035] Example 1: A scraper 10, which can reciprocate linearly in the horizontal direction, can quickly clean the weld slag from the workpiece weld seam. Figures 1-4 As shown, an equipment box 2 is provided on the inner wall of the extrusion molding machine 1, and a connecting plate 3 is fixedly connected to the surface of the equipment box 2. A motor 4 is bolted to the outer wall of the connecting plate 3, and a long pin 6 is rotatably connected to the surface of the connecting plate 3. The output end of the motor 4 is connected to a first gear 5 through a long rod, and a second gear 7 is fixedly connected to the end of the long pin 6. A rack 8 is connected to the front side of the connecting plate 3 through a reciprocating assembly, and a scraper 10 is fixedly connected to the lower surface of the rack 8. Both the first gear 5 and the second gear 7 are non-full gear structures, and the tooth blocks on the surface of the first gear 5 are symmetrically distributed. The reciprocating assembly includes a limiting rod 9 fixedly connected to the surface of the connecting plate 3. The rack 8 is sleeved on the surface of the limiting rod 9, and the top view of the limiting rod 9 is an inverted "L" structure.

[0036] During operation, material is fed through the feeding position on the right side of the extrusion molding machine 1 and processed by the equipment box 2. Simultaneously, the motor 4 on the surface of the connecting plate 3 starts, driving the first gear 5 to rotate clockwise (e.g., ...). Figure 3 As shown, when the first gear 5 meshes with the second gear 7, the second gear 7 and the long pin 6 rotate, causing the rack 8 to move to the right. When the first gear 5 continues to rotate until it no longer meshes with the second gear 7, the first gear 5 will mesh with the rack 8 (at this time, the second gear 7 is still meshed with the rack 8, but the second gear 7 and the long pin 6 do not exert force). The first gear 5 drives the rack 8 to move to the left. When the rack 8 moves to the left, it will drive the second gear 7 and the long pin 6 to rotate. Then, when the first gear 5 continues to rotate clockwise, it will mesh with the second gear 7 again, and the above process will occur again. That is, under the action of the first gear 5, the second gear 7, and the limiting rod 9, the rack 8 drives the scraper 10 to move in the horizontal direction. Thus, the scraper 10 can scrape off the welding slag on the weld surface, which is convenient for subsequent treatment of the welding slag.

[0037] Example 2: Unlike Example 1, by using a reversing component, the cleaning plate 13 can reciprocate linearly in the horizontal direction, expanding the working range of the cleaning plate 13 and optimizing the cleaning effect, such as... Figure 5 and Figure 6 As shown, a fixed plate 11 is fixedly connected to the side of the scraper 10, and a cleaning plate 13 is connected inside the fixed plate 11 through a reversing assembly; the reversing assembly includes a slide rod 12 slidably disposed inside the fixed plate 11, and the cleaning plate 13 is fixedly connected to both ends of the slide rod 12, and a force-bearing block 16 is fixedly connected to the surface of the cleaning plate 13.

[0038] A fixing block 15 is fixedly connected to the surface of the connecting plate 3. The surface of the fixing block 15 and the surface of the force-bearing block 16 are both arc-shaped structures. The force-bearing blocks 16 are evenly distributed on the surface of the cleaning plate 13. A spring damper 14 that plays an elastic reset role is fixedly connected to the surface of the cleaning plate 13. The other side of the spring damper 14 is fixedly connected to the surface of the fixing plate 11.

[0039] When the scraper 10 moves horizontally, it drives the cleaning plate 13 to move synchronously horizontally via the fixed plate 11. At this time, the cleaning plate 13 cleans the welding slag, dispersing it and making it looser, thus facilitating its removal. Simultaneously, during the movement of the cleaning plate 13, the force-bearing block 16 on its surface moves relative to the fixed block 15. Consequently, the force-bearing block 16 is intermittently pushed by the fixed block 15. When the force-bearing block 16 is pushed by the fixed block 15, the force-bearing block 16 and the cleaning plate 13... 3. The sliding rod 12 slides inside the fixed plate 11. At this time, the spring damper 14 is squeezed. When the force block 16 is not pushed by the fixed block 15, the force block 16, the cleaning plate 13, and the sliding rod 12 move back under the action of the spring damper 14. Repeat the above process. Under the action of the sliding rod 12 and the spring damper 14, the force block 16 and the cleaning plate 13 make reciprocating linear motion in the horizontal direction. At this time, the cleaning plate 13 has a multi-directional cleaning function, which optimizes the cleaning effect of welding slag and makes the welding slag looser.

[0040] Example 3: Unlike Example 2, the oscillating component allows the unloading plate 23 to oscillate to the left of the guide plate 18, thus enabling the unloading plate 23 to quickly push the welding slag away from the workpiece. Figures 7-9 As shown, a guide plate 18 is fixedly connected to the end of the fixed plate 11, and a feeding plate 23 is connected to the left side of the guide plate 18 via a swing assembly. The swing assembly includes an auxiliary plate 20 fixedly connected to the left side of the guide plate 18, and an inner shaft 21 is rotatably arranged inside the auxiliary plate 20. An auxiliary gear 22 is fixedly connected to the surface of the inner shaft 21. Both sides of the guide plate 18 are inclined, and the feeding plate 23 is inclined.

[0041] A connecting rod 17 with an inverted "L" structure is fixedly connected to the surface of the connecting plate 3, and a lower connecting rod 19 is fixedly connected to the end of the connecting rod 17. The lower connecting rod 19 is inverted "U" shape when viewed from above. Tooth blocks that mesh with the auxiliary gear 22 are evenly distributed on the surface of the lower connecting rod 19. A material feed plate 23 is fixedly connected to the surface of the inner shaft 21, and the material feed plate 23 is symmetrically distributed on both sides of the guide plate 18.

[0042] When the scraper 10 moves horizontally, it drives the guide plate 18 to move synchronously through the fixed plate 11. The surface of the guide plate 18 is inclined, which causes the welding slag to leave the center of the workpiece, concentrate on both sides of the workpiece and fall off. At the same time, when the guide plate 18 moves, it drives the auxiliary plate 20, the inner shaft 21 and the auxiliary gear 22 to move synchronously. The connecting rod 17, the lower connecting rod 19 and the tooth block on the surface of the lower connecting rod 19 are in a stationary state. Then, the inner shaft 21 is in a reciprocating rotation state under the action of the tooth block and the auxiliary gear 22, that is, the feeding plate 23 is in a swinging state. Thus, the feeding plate 23 can quickly push the welding slag down, resulting in high working efficiency.

[0043] Example 4: Unlike Example 3, the airbag 24 allows for intermittent air supply to the feed plate 23, causing the welding slag to be blown away from the workpiece. Figure 9 and Figure 10 As shown, an inner plate 25 is fixedly connected to the left side of the guide plate 18, and an airbag 24 is bonded to the surface of the inner plate 25. An air suction pipe 26 is fixedly connected to the upper surface of the airbag 24, and a side pipe 27 is fixedly connected to the side of the airbag 24. The surface of the airbag 24 is in contact with the surface of the feed plate 23. The airbag 24 is initially in a compressed state. A connecting pipe 28 is fixedly connected to the surface of the feed plate 23. Nozzles are opened at equal intervals on the surface of the feed plate 23. The connecting pipe 28 is connected to the side pipe 27 through an external hose. One-way valves are provided on the surface of the connecting pipe 28, the surface of the side pipe 27, and the surface of the air suction pipe 26.

[0044] During the oscillation of the feed plate 23, the air bladder 24 will be intermittently compressed. Figure 10 In the process, the unloading plate 23 is in the state before swinging, and the airbag 24 is in the state of being squeezed. When the unloading plate 23 swings outward, the airbag 24 is not squeezed. At this time, the airbag 24 expands and takes in air through the suction pipe 26. When the unloading plate 23 swings back, the airbag 24 is squeezed. At this time, the airbag 24 supplies air to the unloading plate 23 through the side pipe 27, the external hose, and the connecting pipe 28. Then the unloading plate 23 blows air through the nozzle, which plays a role in discharging welding slag. That is, during the process of the unloading plate 23 swinging back, it also plays a role in assisting in material discharge, which has high working efficiency. At the same time, during the operation of the suction pipe 26, the side pipe 27, and the connecting pipe 28, the one-way valve makes the airflow direction from the suction pipe 26 to the unloading plate 23, and there will be no backflow of airflow, which ensures the stability of the operation of the airbag 24 and the unloading plate 23.

[0045] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0046] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-frequency extrusion device for large-diameter welded pipes based on a reverse arc roller, comprising an equipment box (2) disposed on the inner wall of an extrusion molding machine (1), a connecting plate (3) fixedly connected to the surface of the equipment box (2), a motor (4) bolted to the outer wall of the connecting plate (3), and a long pin (6) rotatably connected to the surface of the connecting plate (3), characterized in that: The output end of the motor (4) is connected to the first gear (5) via a long rod, and the end of the long pin (6) is fixedly connected to the second gear (7); the front side of the connecting plate (3) is connected to the rack (8) via a reciprocating assembly, and the lower surface of the rack (8) is fixedly connected to the scraper (10). The scraper (10) is fixedly connected to a fixing plate (11) on its side, and the cleaning plate (13) is connected to the inside of the fixing plate (11) through a reversing assembly. The end of the fixed plate (11) is fixedly connected to the guide plate (18), and the left side of the guide plate (18) is connected to the unloading plate (23) through the swing assembly. The left side of the guide plate (18) is fixedly connected to the inner plate (25), and the surface of the inner plate (25) is bonded to the airbag (24). Both the first gear (5) and the second gear (7) are non-full gear structures, and the tooth blocks on the surface of the first gear (5) are symmetrically distributed. The reciprocating assembly includes a limiting rod (9) fixedly connected to the surface of the connecting plate (3); the rack (8) is sleeved on the surface of the limiting rod (9). The motor (4) drives the first gear (5) to rotate clockwise. When the first gear (5) meshes with the second gear (7), the second gear (7) and the long pin (6) rotate, which causes the rack (8) to move to the right. When the first gear (5) continues to rotate until it no longer meshes with the second gear (7), the first gear (5) will mesh with the rack (8). The first gear (5) drives the rack (8) to move to the left. When the rack (8) moves to the left, it will drive the second gear (7) and the long pin (6) to rotate back. Then, when the first gear (5) continues to rotate clockwise, it will mesh with the second gear (7) again.

2. The high-frequency extrusion device for large-diameter welded pipes based on a reverse-arc roller according to claim 1, characterized in that: The limiting rod (9) can be viewed from above as an inverted "L" structure.

3. The high-frequency extrusion device for large-diameter welded pipes based on a reverse-arc roller according to claim 1, characterized in that: The reversing assembly includes a slide rod (12) slidably disposed inside the fixed plate (11), and the cleaning plate (13) is fixedly connected to both ends of the slide rod (12), and a force-bearing block (16) is fixedly connected to the surface of the cleaning plate (13).

4. The high-frequency extrusion device for large-diameter welded pipes based on a reverse-arc roller according to claim 3, characterized in that: The surface of the connecting plate (3) is fixedly connected to a fixing block (15), and the surface of the fixing block (15) and the surface of the force-bearing block (16) are both arc-shaped structures, and the force-bearing blocks (16) are evenly distributed on the surface of the cleaning plate (13).

5. The high-frequency extrusion device for large-diameter welded pipes based on a reverse-arc roller according to claim 1, characterized in that: The surface of the cleaning plate (13) is fixedly connected to a spring damper (14) that provides elastic reset, and the other side of the spring damper (14) is fixedly connected to the surface of the fixing plate (11).

6. The high-frequency extrusion device for large-diameter welded pipes based on a reverse-arc roller according to claim 1, characterized in that: The swing assembly includes an auxiliary plate (20) fixedly connected to the left side of the guide plate (18), and an inner shaft (21) is rotatably provided inside the auxiliary plate (20), and an auxiliary gear (22) is fixedly connected to the surface of the inner shaft (21). Both sides of the guide plate (18) are inclined, and the feed plate (23) is inclined.

7. The high-frequency extrusion device for large-diameter welded pipes based on a reverse-arc roller according to claim 6, characterized in that: The surface of the connecting plate (3) is fixedly connected to a connecting rod (17) with an inverted "L" structure, and the end of the connecting rod (17) is fixedly connected to a lower connecting rod (19). The lower connecting rod (19) is viewed from above as an inverted "U" shape. The surface of the lower connecting rod (19) is evenly distributed with tooth blocks that mesh with the auxiliary gear (22). The surface of the inner shaft (21) is fixedly connected to the material feed plate (23), and the material feed plate (23) is symmetrically distributed on both sides of the guide plate (18).

8. The high-frequency extrusion device for large-diameter welded pipes based on a reverse-arc roller according to claim 1, characterized in that: The upper surface of the airbag (24) is fixedly connected to the suction tube (26), and the side of the airbag (24) is fixedly connected to the side tube (27). The surface of the airbag (24) is in contact with the surface of the feed plate (23), and the surface of the feed plate (23) is fixedly connected to the connecting tube (28). The airbag (24) is initially in a squeezed state.

9. A high-frequency extrusion device for large-diameter welded pipes based on a reverse-arc roller according to claim 8, characterized in that: The surface of the feed plate (23) is provided with nozzles at equal intervals. The connecting pipe (28) is connected to the side pipe (27) through an external hose. One-way valves are provided on the surface of the connecting pipe (28), the surface of the side pipe (27) and the surface of the suction pipe (26).

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