Welded pipe production line involute forming device and forming method

Abstract

The invention discloses an involute forming device and method for a welded pipe production line, and belongs to the technical field of welded pipe forming. The involute forming device comprises a rack vertically supported above the ground, a driving motor is fixedly mounted on the rack, a collecting seat is fixedly mounted at the upper end of the rack, and a rolling forming assembly is fixedly mounted above the collecting seat; the rolling forming assembly comprises a lower roller rotationally installed on the support, a cam is further rotationally installed on the support on the outermost side, the cam is in transmission connection with the shaft portion of the lower roller through a belt wheel, a hole plate is arranged on the inner side of the collecting base in an elastic lifting mode, and a stirring assembly for accelerating liquid flowing and heat dissipation is rotationally installed on the inner side of the collecting base. According to the involute forming device and method for the welded pipe production line, a multi-direction movable spray head structure is adopted, multi-direction large-range spraying is achieved, spraying cooling of the roller body is effectively improved, the flowing effect of cooling liquid is accelerated in the working process, and the cooling efficiency is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of welded pipe forming, and specifically to an involute forming device and a forming method for a welded pipe production line. Background Art

[0002] As an industrial basic material, welded pipes are widely used in fields such as construction, energy, and machinery manufacturing. The involute forming process is the core technology of the welded pipe process, directly affecting the geometric accuracy of the pipe and the welding process.

[0003] The prior art (Chinese Patent with Publication No. CN210523480U and Publication Date of May 15, 2020) discloses a steel pipe forming device, which relates to the field of steel pipe production. The key points of its technical solution are as follows: It includes a frame, on which an extrusion forming module is arranged. The extrusion forming module includes several forming components arranged in sequence; a cooling component is arranged on the frame. The cooling component includes a liquid inlet pipe arranged on the frame and several spray heads connected to the liquid inlet pipe. The liquid inlet pipe extends along the distribution direction of the forming components. The several spray heads are distributed along the length direction of the liquid inlet pipe, and each spray head is located between two adjacent forming components, and the liquid spraying ports of the spray heads are all arranged above the steel strip; an annular baffle is also arranged on the upper end surface of the frame. The annular baffle surrounds the frame to form a liquid storage cavity, and a drain port communicating with the liquid storage cavity is opened on the frame. By spraying the coolant through the cooling component, the coolant can timely cool the rolling rolls, so as to timely cool the rolling rolls of the forming components and extend the service life of the steel pipe forming equipment;

[0004] The prior art (Chinese Patent with Publication No. CN218362808U and Publication Date of January 24, 2023) discloses a laser welded pipe production line, including a base. A forming main machine is arranged on the base, a laser welding machine is arranged on the base, and a guiding component is arranged inside the forming main machine. The guiding component includes a fixed seat fixedly installed between adjacent forming main machines, and a chute is opened on the top of the fixed seat. In this laser welded pipe production line, by arranging guide wheels, sliding rods and springs between the gaps of the forming main machines, the guide wheels can achieve centering clamping and guiding of the welded pipe, making the transmission of the welded pipe stable. By arranging sliders, guide frames, mounting plates and screws, the position of the guide wheels is stably movable and can be reasonably adjusted. By arranging a suction fan and a smoke collecting hood, the smoke and dust generated during the welding of the welder and the cooling water can be collected, and by arranging a collecting bucket, the condensed and dripping cooling water can be further collected, improving the practicability of the device;

[0005] During the use of the existing involute forming device for a welded pipe production line, the structure of the nozzle is fixed, the spraying direction and range are limited, and it is impossible to evenly and fully cool the roll body, resulting in the roll body being prone to overheating and reducing its service life, and there are certain usage defects. Summary of the Invention

[0006] The object of the present invention is to provide an involute forming device and a forming method for a welded pipe production line, so as to solve the problem in the above-mentioned background technology that the nozzle structure of the involute forming device in the current market for welded pipe production lines is fixed, the spraying direction and range are limited, and the rollers cannot be cooled evenly and sufficiently, resulting in the temperature of the rollers being prone to be too high and reducing the service life.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The involute forming device for a welded pipe production line includes a frame erected and supported above the ground. A driving motor is fixedly installed on the frame, and a collecting seat is fixedly installed at the upper end of the frame. A roll forming assembly is fixedly installed above the collecting seat. The roll forming assembly includes a lower roll rotatably installed on a bracket, and a cam is also rotatably installed on the outermost bracket. The cam and the shaft of the lower roll are connected by a belt pulley drive. An orifice plate is elastically lifted and lowered inside the collecting seat, and the cam pushes the orifice plate to lift and adjust during rotation. An installation frame is fixedly installed at the upper end of the bracket, and a spraying assembly that rotates and swings is installed on the installation frame. A delivery pump and a heat exchanger are respectively fixedly installed outside the collecting seat. The output end of the delivery pump is connected to a circulation pipe, and a stirring assembly for accelerating the heat dissipation by liquid flow is rotatably installed inside the collecting seat.

[0009] Preferably, the roll forming assembly includes an adjusting frame that is lifted and slidably installed on the bracket. An activity roll is rotatably installed on the adjusting frame, and a lead screw is rotatably installed on the adjusting frame. The lead screw is threadedly connected to the bracket. The lower roll and the activity roll convey and extrude the material to achieve shaping.

[0010] Preferably, a guide post is vertically fixedly installed on the upper surface of the orifice plate. The guide post penetrates through the upper end of the collecting seat, and a first spring is connected between the upper end of the guide post and the collecting seat. The cam pushes the guide post to lift and adjust during rotation.

[0011] Preferably, the side wall of the orifice plate is hermetically attached to the inner wall of the collecting seat. Through holes are evenly formed on the orifice plate. The orifice plate and the lower roll are arranged corresponding to each other. The initial height of the orifice plate is higher than the liquid level height of the coolant in the collecting seat. The orifice plate is immersed in the coolant during downward movement, and the coolant is extruded through the through holes and impacts the lower roll during downward movement of the orifice plate.

[0012] Preferably, the spraying assembly includes a movable rod that is elastically rotatably installed on the installation frame. A traction rope is wound around the outside of the movable rod. The lower end of the traction rope is fixedly connected to the upper surface of the orifice plate. The movable rod is driven to perform reciprocating elastic rotation through the traction rope during the reciprocating lifting and lowering of the orifice plate.

[0013] Preferably, the spraying assembly further includes a movable seat slidably mounted on the outer side of the movable rod, a nozzle is clamped on the movable seat, an infusion tube is connected between the nozzle and the circulation pipe, and the nozzle faces the movable roller.

[0014] Preferably, two fixing plates are symmetrically and fixedly mounted on the outer side of the movable rod with respect to the movable seat, a second spring is fixedly connected between the movable seat and one of the fixing plates, a movable seat is fixedly mounted on the outer side of the movable seat through a frame, and second magnetic blocks are uniformly mounted in a ring on the outer side of the mounting frame. During the rotation of the movable rod driving the movable seat, the first magnetic block gradually passes outside the second magnetic blocks at different positions, and the movable seat performs reciprocating elastic sliding along the outer side of the movable rod under the magnetic force of the first magnetic block and the second magnetic blocks.

[0015] Preferably, an air bag is fixedly connected between the movable seat and the other fixing plate away from the second spring, an air nozzle is fixedly mounted on the air bag, and the air nozzle faces the inner side of the collecting seat. During the sliding of the movable seat, the air bag is reciprocally squeezed and stretched.

[0016] Preferably, the stirring assembly includes a stirring rod rotatably mounted on the inner side of the lower end of the collecting seat, stirring blades are uniformly fixedly mounted on the outer side of the stirring rod, a spiral guide groove is formed on the outer wall of the upper part of the stirring rod, the upper part of the stirring rod penetrates through the hole plate, and balls are embedded in the inner wall of the hole of the hole plate penetrated by the stirring rod, and the balls roll along the guide groove to drive the stirring rod to rotate.

[0017] The forming method of the involute forming device for the welded pipe production line includes the following steps:

[0018] S1. Start the driving motor to drive the lower roller to rotate, and convey the sheet to between the lower roller and the movable roller. At this time, multiple groups of lower rollers and movable rollers can gradually roll and form the sheet to realize the gradual extrusion forming of the sheet.

[0019] S2. At the same time, start the delivery pump and the heat exchanger. The delivery pump extracts the coolant in the collecting seat through the heat exchanger, and after heat exchange and cooling, it is conveyed to each infusion tube through the circulation pipe, and then sprayed to the movable roller through the nozzle.

[0020] S3. During the rotation of the lower roller at the edge position, the cam is driven to rotate through the pulley, so that the cam reciprocally presses the guide post, and the hole plate performs reciprocating elastic lifting adjustment. Thus, under the pressure, the coolant in the collecting seat is extruded through the holes on the hole plate to impact the lower roller. At the same time, the hole plate pulls the movable rod to rotate reciprocally through the traction rope, so that the nozzle swings and sprays, improving the cooling of the lower roller and the movable roller. At the same time, the lifting of the hole plate will drive the stirring rod to rotate reciprocally, accelerating the heat dissipation of the coolant.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The involute forming device and forming method of this welded pipe production line adopt a multi-directional movable nozzle structure to achieve multi-directional large-range spraying, which limitedly improves the spraying and cooling of the roll body, and accelerates the flow effect of the coolant during the working process, strengthening the cooling efficiency. The specific content is as follows;

[0023] 1. A cam and an orifice plate are provided. As the cam rotates, it can push the orifice plate to reciprocate up and down inside the collecting seat, so that the orifice plate can squeeze the coolant inside the collecting seat, causing the coolant to be extruded through the through holes on the orifice plate and impact the lower roll to achieve the cooling of the lower roll.

[0024] Furthermore, as the orifice plate reciprocates up and down, it can drive the stirring rod inside the collecting seat to rotate synchronously and reciprocally, realizing the stirring of the coolant, thereby accelerating the flow and cooling of the coolant.

[0025] 2. A movable rod and a nozzle are provided. By starting the transfer pump and heat exchanger, the coolant can be transported to the infusion pipe through the circulation pipe, and the nozzle connected to the end of the infusion pipe sprays evenly on the movable roll to achieve the synchronous cooling of the movable roll. As the movable rod rotates reciprocally, the movable seat can rotate synchronously, and the movable seat will also reciprocally slide horizontally under the magnetic force of the first magnet and the second magnet, thus realizing swinging spraying, effectively expanding the spraying range and strengthening the cooling effect on the movable roll.

[0026] Furthermore, an airbag and an air nozzle are also provided. As the movable seat moves horizontally, it can reciprocally squeeze and stretch the airbag, causing the airbag to inhale and exhale through the air nozzle, thereby accelerating the flow of air near the roll body and further strengthening the cooling effect. Description of the Drawings

[0027] Figure 1 is a three-dimensional structure schematic diagram of the present invention;

[0028] Figure 2 is a schematic diagram of the bracket installation structure of the present invention;

[0029] Figure 3 is a schematic diagram of the installation structure of the lower roll and the movable roll of the present invention;

[0030] Figure 4 is a schematic diagram of the installation structure of the orifice plate and the movable rod of the present invention;

[0031] Figure 5 is a schematic diagram of the connection structure between the movable rod and the movable seat of the present invention;

[0032] Figure 6 is a schematic diagram of the nozzle installation structure of the present invention;

[0033] Figure 7 is of the present invention Figure 6 is an enlarged structure schematic diagram at A in;

[0034] Figure 8 This is a schematic diagram of the connection structure between the orifice plate and the stirring rod of the present invention.

[0035] In the figure: 1, frame; 2, drive motor; 3, collection seat; 4, bracket; 5, lower roller; 6, adjustment frame; 7, lead screw; 8, movable roller; 9, cam; 10, orifice plate; 11, guide post; 12, first spring; 13, mounting frame; 14, movable rod; 15, towing rope; 16, movable seat; 17, nozzle; 18, delivery pump; 19, heat exchanger; 20, circulation pipe; 21, infusion pipe; 22, fixed plate; 23, second spring; 24, first magnet; 25, second magnet; 26, airbag; 27, air nozzle; 28, stirring rod; 29, guide groove; 30, ball. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Embodiment 1: During the working process of the existing involute forming device for welded pipe production lines, the spraying structure is single, and the temperature reduction range and effect of spraying and cooling are limited, and it is impossible to achieve efficient temperature reduction of the roller body. To solve this technical problem, the following technical content is disclosed in this embodiment. Please refer to Figures 1-7 as shown;

[0038] Involute forming device for welded pipe production line, including a frame 1 erected and supported above the ground, a driving motor 2 fixedly installed on the frame 1, a collecting seat 3 fixedly installed at the upper end of the frame 1, and a roll forming assembly fixedly installed above the collecting seat 3; the roll forming assembly includes a lower roll 5 rotatably installed on a bracket 4, and a cam 9 is also rotatably installed on the outermost bracket 4, and the cam 9 and the shaft of the lower roll 5 are connected by a pulley drive. An orifice plate 10 is elastically lifted and lowered inside the collecting seat 3, and the cam 9 pushes the orifice plate 10 to lift and adjust during rotation. The upper end of the bracket 4 is fixedly installed with a mounting frame 13, and a rotating and swinging spraying assembly is installed on the mounting frame 13. A delivery pump 18 and a heat exchanger 19 are respectively fixedly installed outside the collecting seat 3, and the output end of the delivery pump 18 is connected with a circulating pipe 20. The roll forming assembly includes an adjusting frame 6 installed on the bracket 4 with lifting and sliding, and a movable roll 8 is rotatably installed on the adjusting frame 6, and a lead screw 7 is rotatably installed on the adjusting frame 6. At the same time, the lead screw 7 is threadedly connected with the bracket 4, and the lower roll 5 and the movable roll 8 convey and extrude the material to achieve shaping. A guide post 11 is vertically fixedly installed on the upper surface of the orifice plate 10, and the guide post 11 passes through the upper end of the collecting seat 3. A first spring 12 is connected between the upper end of the guide post 11 and the collecting seat 3. At the same time, the cam 9 pushes the guide post 11 to lift and adjust during rotation. The spraying assembly includes a movable rod 14 elastically rotatably installed on the mounting frame 13, and a traction rope 15 is wound around the outer side of the movable rod 14. The lower end of the traction rope 15 is fixedly connected to the upper surface of the orifice plate 10. At the same time, during the reciprocating lifting of the orifice plate 10, the movable rod 14 is driven to perform reciprocating elastic rotation through the traction rope 15. The spraying assembly also includes a movable seat 16 slidably installed on the outer side of the movable rod 14, and a nozzle 17 is clamped on the movable seat 16. A liquid delivery pipe 21 is connected between the nozzle 17 and the circulating pipe 20. At the same time, the nozzle 17 faces the movable roll 8. Two fixing plates 22 are symmetrically fixedly installed on the outer side of the movable rod 14 with respect to the movable seat 16, and a second spring 23 is fixedly connected between the movable seat 16 and one of the fixing plates 22. The outer side of the movable seat 16 is fixedly installed with a movable seat 16 through a frame body, and second magnetic blocks 25 are evenly installed in a ring shape on the outer side of the mounting frame 13. And during the rotation of the movable rod 14 driving the movable seat 16, the first magnetic block 24 gradually passes outside different positions of the second magnetic blocks 25. The movable seat 16 performs reciprocating elastic sliding along the outer side of the movable rod 14 under the magnetic force of the first magnetic block 24 and the second magnetic blocks 25. An airbag 26 is fixedly connected between the movable seat 16 and the other fixing plate 22 away from the second spring 23, and an air nozzle 27 is fixedly installed on the airbag 26, and the air nozzle 27 faces the inside of the collecting seat 3. At the same time, during the sliding of the movable seat 16, the airbag 26 is reciprocally squeezed and stretched.

[0039] Start the drive motor 2, which drives the lower roller 5 to rotate through the transmission mechanism. At this time, the lower roller 5 and the movable roller 8 can convey and extrude the sheet material. Through the conveying and extrusion of multiple groups of lower rollers 5 and movable rollers 8, the gradual forming of the welded pipe can be achieved. By rotating the lead screw 7, the position height of the adjusting frame 6 on the bracket 4 can be adjusted to realize the height adjustment of the movable roller 8. As the sheet material is conveyed and roll-formed, the conveying pump 18 and the heat exchanger 19 are started simultaneously, so that the conveying pump 18 can extract the coolant in the collection seat 3 and convey it to the nozzle 17 through the heat exchanger 19, the circulation pipe 20, and the infusion pipe 21, so that the nozzle 17 sprays the coolant onto the movable roller 8 to realize the cooling of the movable roller 8. At the same time, during the rotation of the outermost lower roller 5, the cam 9 is driven to rotate through the pulley, so that the cam 9 reciprocally extrudes and pushes the guide post 11 during rotation, so that the guide post 11 drives the orifice plate 10 to reciprocally elastically lift. During the downward movement of the orifice plate 10, the movable rod 14 is pulled to reciprocally rotate through the traction rope 15, so that the movable rod 14 drives the movable seat 16 to rotate synchronously. During the rotation of the movable seat 16, the first magnet 24 on its outer side intermittently passes by the outer side of the second magnet 25, so that the movable seat 16 reciprocally slides horizontally under the action of magnetic force and the elastic force of the second spring 23, so that the nozzle 17 can evenly spray the surface of the movable roller 8, effectively improving the cooling effect on the movable roller 8. At the same time, during the reciprocating movement of the movable seat 16, the airbag 26 is also squeezed and stretched, so that the airbag 26 blows air to the collection seat 3 and the movable roller 8 through the air nozzle 27, accelerating the air flow, and further optimizing the cooling effect.

[0040] Embodiment 2: The technical content disclosed in this embodiment is a further improvement based on the above Embodiment 1. During the use of the existing involute forming device for the welded pipe production line, the fluidity of the coolant is poor after collection, so that the temperature of the coolant itself is likely to be too high to achieve an effective cooling effect. To further solve this technical problem, the following technical content is disclosed in this embodiment, as Figure 4 and Figure 8As shown in the figure; a stirring assembly for accelerating the heat dissipation of liquid flow is rotatably installed inside the collection seat 3. The side wall of the orifice plate 10 is sealingly attached to the inner wall of the collection seat 3, and through holes are evenly formed in the orifice plate 10. Moreover, the positions of the orifice plate 10 and the lower roller 5 are correspondingly arranged. The initial height of the orifice plate 10 is higher than the liquid level height of the coolant in the collection seat 3. At the same time, the orifice plate 10 is immersed in the coolant during the downward movement. Moreover, during the downward movement of the orifice plate 10, the coolant is extruded through the through holes and impacts the lower roller 5. The stirring assembly includes a stirring rod 28 rotatably installed inside the lower end of the collection seat 3. Stirring blades are evenly and fixedly installed on the outer side of the stirring rod 28. Moreover, a spiral guide groove 29 is formed on the outer wall of the upper part of the stirring rod 28. At the same time, the upper part of the stirring rod 28 penetrates through the orifice plate 10. Moreover, balls 30 are embedded and installed on the inner wall of the hole in the orifice plate 10 penetrated by the stirring rod 28. At the same time, the balls 30 roll along the guide groove 29 to drive the stirring rod 28 to rotate.

[0041] As the orifice plate 10 moves downward, it will squeeze the coolant inside the collection seat 3, causing the coolant to be extruded through the through holes in the orifice plate 10 under pressure, thereby realizing the impact cooling of the lower roller 5. At the same time, as the orifice plate 10 is lifted and adjusted, the balls 30 arranged thereon will roll along the guide groove 29 formed on the stirring rod 28, thereby driving the stirring rod 28 to rotate reciprocally, so that the stirring rod 28 can accelerate the liquid flow inside the collection seat 3, thereby promoting the cooling of the coolant.

[0042] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0043] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Inwardly opening forming device for welded pipe production line, comprising a frame (1) erected and supported above the ground, a driving motor (2) fixedly installed on the frame (1), a collecting seat (3) fixedly installed at the upper end of the frame (1), and a roll forming assembly fixedly installed above the collecting seat (3); characterized in that: The roll forming assembly includes a lower roll (5) rotatably mounted on a bracket (4), and a cam (9) is also rotatably mounted on the outermost bracket (4). The cam (9) and the shaft of the lower roll (5) are connected by a pulley drive. An orifice plate (10) is elastically lifted and lowered inside the collecting seat (3), and the cam (9) pushes the orifice plate (10) to lift and adjust during rotation. An installation frame (13) is fixedly mounted at the upper end of the bracket (4), and a spray assembly that rotates and swings is mounted on the installation frame (13). A delivery pump (18) and a heat exchanger (19) are respectively fixedly mounted on the outside of the collecting seat (3). The output end of the delivery pump (18) is connected to a circulation pipe (20), and a stirring assembly for accelerating the heat dissipation of the liquid flow is rotatably mounted inside the collecting seat (3).

2. The involute forming device for the welded pipe production line according to claim 1, characterized in that: The roll forming assembly includes an adjusting frame (6) that is lifted and slidably mounted on the bracket (4). A movable roll (8) is rotatably mounted on the adjusting frame (6), and a lead screw (7) is rotatably mounted on the adjusting frame (6). At the same time, the lead screw (7) is threadedly connected to the bracket (4). Moreover, the lower roll (5) and the movable roll (8) convey and extrude the material to achieve shaping.

3. The involute forming device for the welded pipe production line according to claim 1, characterized in that: A guide post (11) is vertically fixedly mounted on the upper surface of the orifice plate (10), and the guide post (11) penetrates through the upper end of the collecting seat (3). A first spring (12) is connected between the upper end of the guide post (11) and the collecting seat (3). At the same time, the cam (9) pushes the guide post (11) to lift and adjust during rotation.

4. The involute forming device for the welded pipe production line according to claim 3, wherein: The side wall of the orifice plate (10) is hermetically fitted to the inner wall of the collecting seat (3). Through holes are evenly formed in the orifice plate (10), and the positions of the orifice plate (10) and the lower roll (5) are correspondingly arranged. The initial height of the orifice plate (10) is higher than the liquid level of the coolant in the collecting seat (3). When the orifice plate (10) moves downward, it is immersed in the coolant, and when the orifice plate (10) moves downward, the coolant is extruded through the through holes and impacts the lower roll (5).

5. The involute forming device for the welded pipe production line according to claim 1, wherein: The spray assembly includes a movable rod (14) that is elastically rotatably mounted on the installation frame (13). A traction rope (15) is wound around the outside of the movable rod (14). The lower end of the traction rope (15) is fixedly connected to the upper surface of the orifice plate (10). At the same time, when the orifice plate (10) reciprocates up and down, the movable rod (14) is driven to reciprocate and elastically rotate through the traction rope (15).

6. The involute forming device for the welded pipe production line according to claim 5, characterized in that: The spray assembly further includes a movable seat (16) slidably mounted on the outside of the movable rod (14). A spray head (17) is clamped on the movable seat (16). An infusion pipe (21) is connected between the spray head (17) and the circulation pipe (20). At the same time, the spray head (17) faces the movable roll (8).

7. The involute forming device for the welded pipe production line according to claim 6, characterized in that: On the outer side of the movable rod (14), two fixed plates (22) are symmetrically and fixedly installed with respect to the movable seat (16), and a second spring (23) is fixedly connected between the movable seat (16) and one of the fixed plates (22). The outer side of the movable seat (16) is fixedly installed with a movable seat (16) through a frame body, and second magnetic blocks (25) are evenly installed in a ring shape on the outer side of the mounting frame (13). During the rotation of the movable rod (14) driving the movable seat (16), the first magnetic block (24) gradually passes by the outer sides of the second magnetic blocks (25) at different positions. The movable seat (16) performs reciprocating elastic sliding along the outer side of the movable rod (14) under the magnetic force of the first magnetic block (24) and the second magnetic blocks (25).

8. The involute forming device for a welded pipe production line according to claim 7, characterized in that: A gas bag (26) is fixedly connected between the movable seat (16) and the other fixed plate (22) away from the second spring (23), and an air nozzle (27) is fixedly installed on the gas bag (26), and the air nozzle (27) faces the inner side of the collecting seat (3). At the same time, the gas bag (26) is reciprocally squeezed and stretched during the sliding of the movable seat (16).

9. The involute forming device for the welded pipe production line according to claim 1, characterized in that: The stirring assembly includes a stirring rod (28) rotatably installed on the inner side of the lower end of the collecting seat (3). Stirring blades are evenly and fixedly installed on the outer side of the stirring rod (28). A spiral guide groove (29) is formed on the outer wall of the upper part of the stirring rod (28). At the same time, the upper part of the stirring rod (28) penetrates through the hole plate (10). And the inner wall of the hole of the hole plate (10) penetrated by the stirring rod (28) is embedded with a ball (30). At the same time, the ball (30) rolls along the guide groove (29) to drive the stirring rod (28) to rotate.

10. Forming method of an involute forming device for a welded pipe production line, characterized in that: It includes the following steps: S1. Start the driving motor (2) to drive the lower roller (5) to rotate, and convey the plate to between the lower roller (5) and the movable roller (8). At this time, multiple groups of lower rollers (5) and movable rollers (8) can gradually roll and form the plate to realize the gradual extrusion and forming of the plate; S2. At the same time, start the delivery pump (18) and the heat exchanger (19). The delivery pump (18) extracts the coolant in the collecting seat (3) through the heat exchanger (19), and after heat exchange and cooling, it is conveyed to each liquid delivery pipe (21) through the circulation pipe (20), and then sprayed onto the movable roller (8) through the nozzle (17); S3. During the rotation of the lower roller (5) at the edge position, the cam (9) is driven to rotate through a pulley, so that the cam (9) reciprocally squeezes the guide post (11), so that the hole plate (10) performs reciprocating elastic lifting adjustment. Thus, the coolant in the collecting seat (3) is extruded through the holes on the hole plate (10) under pressure to impact the lower roller (5). At the same time, the hole plate (10) pulls the movable rod (14) to rotate reciprocally through the traction rope (15), so that the nozzle (17) swings and sprays, improving the cooling of the lower roller (5) and the movable roller (8). At the same time, the lifting of the hole plate (10) will drive the stirring rod (28) to rotate reciprocally, accelerating the heat dissipation of the coolant.

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