Steel plate edge rolling welding device

Abstract

The invention discloses a steel plate edge rolling and welding device which comprises an edge rolling mechanism, a first driving mechanism, two second driving mechanisms and a welding mechanism, the edge rolling mechanism comprises a center die roller, a lower die base and two upper die bases, the center die roller is horizontally arranged, the lower die base is arranged under the center die roller and provided with a lower die cavity, and the two upper die bases are arranged on the lower die cavity. A steel plate is placed on the lower die base, and the two upper die bases are arranged on the two sides of the center die roller respectively and each provided with an upper die cavity. The first driving mechanism is connected with the lower die base and used for driving the lower die base to move up and down so that the middle of the steel plate can abut against the center die roller, and the steel plate can be extruded into a U-shaped workpiece. The two second driving mechanisms are connected with the two upper die bases in a one-to-one correspondence mode. The edge rolling welding device has the beneficial effects that the edge rolling welding device is used for carrying out edge rolling treatment on a steel plate, the precision is higher, and in-situ welding can be carried out on opposite seams of an edge-rolled can body.

Description

Technical Field

[0001] The invention relates to the technical field of steel plate processing, and in particular to a steel plate curling welding device. Background Art

[0002] Oil tanks are containers for storing crude oil or other petroleum products, and are used in refineries, oil fields, oil depots, and other industrial fields. The processing steps of oil tanks are as follows: first, the steel plate is cut into appropriate width and length, and then the cut steel plate is rolled into a tubular structure to form a tank body, and then the seams of the tank body are welded, and then multiple tank bodies are butt-welded, and finally the end cover and the tank body are ring-welded. During the processing of the oil tank, the steel plate cut by the cutting machine enters the tube rolling machine (such as a steel plate rolling machine disclosed in application number 202111060612.6) for rolling to form a tubular structure of the tank body. After the tank body is taken out, it is transferred to the welding area for straight seam welding. During the transfer of the tank body, the seams of the tank body are prone to misalignment, and the tube rolling machine of the above structure has high requirements for the parallelism of the rollers. If the parallelism of the rollers deviates, it is easy to cause the accuracy of the rolled can body to be poor. Summary of the invention

[0003] The purpose of the present invention is to overcome the above technical deficiencies and to provide a steel plate rolling welding device to solve the technical problem in the prior art that the seams of the can body after rolling cannot be welded in situ.

[0004] In order to achieve the above technical objectives, the technical solution of the present invention provides a steel plate curling welding device, comprising: The rolling mechanism comprises a central die roller, a lower die seat and two upper die seats, wherein the central die roller is arranged horizontally, the lower die seat is arranged directly below the central die roller and has a lower die cavity, the lower die seat is used to place the steel plate, and the two upper die seats are respectively arranged on both sides of the central die roller and each has an upper die cavity; A first driving mechanism is connected to the lower die base and is used to drive the lower die base to move up and down so that the middle of the steel plate abuts against the central die roller and squeezes the steel plate into a U-shaped workpiece; Two second driving mechanisms are connected to the two upper die seats in a one-to-one correspondence, and are used to drive the upper die seats to move in a horizontal direction, so that the two ends of the U-shaped workpiece abut against the central die roller, and the U-shaped workpiece is extruded into a tubular workpiece; The welding mechanism is arranged just above the central die roller and is used for welding the butt joints of the tubular workpiece.

[0005] Furthermore, when the lower die seat and the two upper die seats are retracted to each other, the lower die cavity and the two upper die cavities enclose a molding cavity of a columnar structure coaxial with the central die roller.

[0006] Furthermore, the steel plate rolling welding device also includes a frame, and one end of the central mold roller is fixedly connected to the frame.

[0007] Furthermore, the central mold roller is provided with a receiving groove extending along its axial direction, the notch of the receiving groove is vertically upward, and the butt seam of the extruded tubular workpiece corresponds to the notch of the receiving groove.

[0008] Furthermore, the welding mechanism includes a first electrode plate, a second electrode plate, a translation assembly, a lifting assembly and a power supply assembly. The first electrode plate is detachably arranged in the accommodating groove along the length direction of the accommodating groove. The top of the first electrode plate is used to abut against the seam of the extruded tubular workpiece. The second electrode plate is arranged above the center mold roller and corresponds to the first electrode plate. The translation assembly can move horizontally along the axial direction of the center mold roller. One end of the lifting assembly is connected to the translation assembly, and the other end of the lifting assembly is connected to the second electrode plate, which is used to drive the second electrode plate to move up and down so that the bottom of the second electrode plate abuts against the seam of the extruded tubular workpiece. The power supply assembly is electrically connected to the first electrode plate and the second electrode plate.

[0009] Furthermore, the steel plate rolling welding device also includes a pushing mechanism, which is used to abut against one end of the extruded tubular workpiece and push the tubular workpiece to move axially along the center mold roller to separate the tubular workpiece from the center mold roller.

[0010] Furthermore, the pushing mechanism includes a pushing plate and a pushing drive assembly, the pushing plate is slidably mounted on the center mold roller, and the pushing drive assembly is connected to the pushing plate and is used to drive the pushing plate to move along the axial direction of the center mold roller, so that the pushing plate pushes the tubular workpiece to move along the axial direction of the center mold roller and causes the tubular workpiece to detach from the center mold roller.

[0011] Furthermore, the steel plate rolling welding device also includes a first conveying mechanism, which is arranged below the central mold roller and is used to horizontally convey the steel plate to the lower mold base.

[0012] Furthermore, the first conveying mechanism includes two side plates, two conveyor belts, two annular reciprocating drive assemblies and a baffle, the two side plates are relatively arranged on both sides of the central mold roller, the two conveyor belts are closed belts, and are relatively spaced and arranged between the two side plates, the lower mold base is located between the two conveyor belts, the two annular reciprocating drive assemblies are connected to the two conveyor belts one by one, and are used to drive the two conveyor belts to perform annular reciprocating motion synchronously, the baffle is arranged at the end of the two conveyor belts, and the two ends of the baffle are respectively fixedly connected to the two side plates.

[0013] Furthermore, the steel plate rolling welding device also includes a second conveying mechanism, which is arranged below the central mold roller and above the first conveying mechanism, and is used to receive and convey the tubular workpiece pushed out by the pushing mechanism.

[0014] Compared with the prior art, the beneficial effects of the present invention include: when in use, the steel plate to be rolled is placed on the lower die seat, and the first driving mechanism is controlled to drive the lower die seat to move upward, so that the middle part of the steel plate can abut against the center die roller, and the lower die seat continues to move upward, and the lower die cavity interacts with the center die roller to extrude the steel plate into a U-shaped workpiece, and the two second driving mechanisms are controlled to drive the corresponding upper die seats to move in the horizontal direction and gradually approach the center die roller, so that the two ends of the U-shaped workpiece can abut against the center die roller, and the two upper die seats continue to approach the center die roller, and the two upper die cavities interact with the center die roller to extrude the U-shaped workpiece into a tubular workpiece, and the welding mechanism can be controlled to perform in-situ welding on the seams of the can body after rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of a steel plate curling welding device provided by the present invention; Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of a steel plate curling welding device after omitting the second conveying mechanism; Figure 3 yes Figure 2 A schematic diagram of the three-dimensional structure of a steel plate rolling welding device when the steel plate abuts against the central die roller; Figure 4 yes Figure 3 A schematic diagram of the three-dimensional structure of a steel plate rolling welding device when the steel plate is extruded into a U-shaped workpiece; Figure 5 yes Figure 4 A schematic diagram of the three-dimensional structure of a steel plate rolling welding device when a U-shaped workpiece is extruded into a tubular workpiece; In the figure: 100 - rolling mechanism, 110 - central die roller, 111 - accommodating groove, 120 - lower die seat, 121 - lower die cavity, 130 - upper die seat, 131 - upper die cavity, 200 - first driving mechanism, 210 - first guide frame, 220 - first telescopic driving member, 300 - second driving mechanism, 310 - second guide frame, 320 - second telescopic driving member, 400 - welding mechanism, 410 - first electrode plate, 420 - second electrode plate, 430 - translation assembly, 4 31 - first moving seat, 432 - third telescopic driving member, 440 - lifting assembly, 441 - second moving seat, 442 - fourth telescopic driving member, 500 - frame, 600 - pushing mechanism, 610 - pushing plate, 620 - pushing driving assembly, 621 - third guide frame, 622 - fifth telescopic driving member, 700 - first conveying mechanism, 710 - side plate, 720 - conveyor belt, 730 - circular reciprocating driving assembly, 740 - baffle, 800 - second conveying mechanism. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] The present invention provides a steel plate rolling welding device, the structure of which is as follows: Figure 1 - Figure 5 As shown, it includes a rolling mechanism 100, a first driving mechanism 200, two second driving mechanisms 300 and a welding mechanism 400, wherein the rolling mechanism 100 includes a central die roller 110, a lower die holder 120 and two upper die holders 130, wherein the central die roller 110 is horizontally arranged, the lower die holder 120 is arranged directly below the central die roller 110 and has a lower die cavity 121, the lower die holder 120 is used to place a steel plate, and the two upper die holders 130 are respectively arranged on both sides of the central die roller 110 and each has an upper die cavity 131; the first driving mechanism 200 is connected to the lower die base 120, and is used to drive the lower die base 120 to move up and down so that the middle part of the steel plate abuts against the central die roller 110, and the steel plate is extruded into a U-shaped workpiece; the two second driving mechanisms 300 are connected to the two upper die bases 130 in a one-to-one correspondence, and are used to drive the upper die bases 130 to move in the horizontal direction, so that the two ends of the U-shaped workpiece abut against the central die roller 110, and the U-shaped workpiece is extruded into a tubular workpiece; the welding mechanism 400 is arranged directly above the central die roller 110, and is used to weld the butt seams of the tubular workpiece.

[0018] When in use, the steel plate to be rolled is placed on the lower die seat 120, and the first driving mechanism 200 is operated to drive the lower die seat 120 to move upward, so that the middle part of the steel plate can abut against the center die roller 110, and the lower die seat 120 continues to move upward, and the lower die cavity 121 interacts with the center die roller 110 to extrude the steel plate into a U-shaped workpiece, and the two second driving mechanisms 300 are operated to drive the corresponding upper die seats 130 to move in the horizontal direction and gradually approach the center die roller 110, so that the two ends of the U-shaped workpiece can abut against the center die roller 110, and the two upper die seats 130 continue to approach the center die roller 110, and the two upper die cavities 131 interact with the center die roller 110 to extrude the U-shaped workpiece into a tubular workpiece, and the welding mechanism 400 can be operated to perform in-situ welding on the seams of the can body after rolling.

[0019] As a preferred embodiment, please refer to Figure 5 When the lower die base 120 and the two upper die bases 130 are retracted together, the lower die cavity 121 and the two upper die cavities 131 enclose a columnar molding cavity coaxial with the central die roller 110, so that the steel plate can be extruded into a tubular workpiece, achieving the rounding processing of the steel plate with higher precision.

[0020] As a preferred embodiment, please refer to Figure 1 The steel plate rolling welding device also includes a frame 500, one end of the center mold roller 110 is fixedly connected to the frame 500, and the center mold roller 110 can be supported and fixed by the frame 500.

[0021] As a preferred embodiment, please refer to Figure 2 The first driving mechanism 200 includes a first guide frame 210 and a first telescopic driving member 220. The first guide frame 210 is slidably connected to the frame 500 and can move up and down along the frame 500. The top of the first guide frame 210 is fixedly connected to the lower mold base 120. The output end of the first telescopic driving member 220 is fixedly connected to the bottom of the first guide frame 210, and is used to drive the first guide frame 210 to move up and down. By manipulating the first telescopic driving member 220, the telescopic end of the first telescopic driving member 220 is extended or shortened, which can drive the first guide frame 210 to move upward or downward, thereby driving the lower mold base 120 to move upward or downward.

[0022] As a preferred embodiment, please refer to Figure 2 and Figure 3The second driving mechanism 300 includes a second guide frame 310 and a second telescopic driving member 320. The second guide frame 310 is slidably connected to the frame 500 and can move horizontally along the frame 500. One end of the second guide frame 310 is fixedly connected to the upper mold base 130. The output end of the second telescopic driving member 320 is fixedly connected to the other end of the second guide frame 310, and is used to drive the second guide frame 310 to move horizontally. By manipulating the second telescopic driving member 320, the telescopic end of the second telescopic driving member 320 is extended or shortened, which can drive the second guide frame 310 to move horizontally, so that the second guide frame 310 is close to or away from the center mold roller 110, thereby driving the upper mold base 130 to move horizontally, and the upper mold base 130 is close to or away from the center mold roller 110.

[0023] As a preferred embodiment, please refer to Figure 2 and Figure 3 The central mold roller 110 is provided with a receiving groove 111 extending along its axial direction, the notch of the receiving groove 111 is vertically upward, the seam of the extruded tubular workpiece corresponds to the notch of the receiving groove 111, and the receiving groove 111 can accommodate the first electrode plate 410.

[0024] As a preferred embodiment, please refer to Figure 3 and Figure 4The welding mechanism 400 includes a first electrode plate 410, a second electrode plate 420, a translation assembly 430, a lifting assembly 440 and a power supply assembly. The first electrode plate 410 is detachably arranged in the accommodating groove 111 along the length direction of the accommodating groove 111. The top of the first electrode plate 410 is used to abut against the seam of the butt joint of the extruded tubular workpiece. The second electrode plate 420 is arranged above the central die roller 110 and corresponds to the first electrode plate 410. The translation assembly 430 can move horizontally along the axial direction of the central die roller 110. One end of the lifting assembly 440 is connected to the translation assembly 430, and the other end of the lifting assembly 440 is connected to the second electrode plate 420, and is used to drive the second electrode plate 420 to move up and down so that the bottom of the second electrode plate 420 abuts against the seam of the butt joint of the extruded tubular workpiece. The power supply assembly is connected to the first electrode plate 410 and the second electrode plate 420. Electrically connected, the positive and negative electrodes of the power supply assembly are electrically connected to the first electrode plate 410 or the second electrode plate 420 respectively. Since the seam of the extruded tubular workpiece corresponds to the accommodating groove 111, the top of the first electrode plate 410 can be abutted against the seam of the extruded tubular workpiece. By manipulating the lifting assembly 440, the lifting assembly 440 drives the second electrode plate 420 to move downward, so that the bottom of the second electrode plate 420 can be abutted against the seam of the extruded tubular workpiece. At this time, the resistance to the current becomes larger, and a large amount of heat is generated at the seam to melt the contact point of the tubular workpiece, and the second electrode plate 420 applies pressure to the tubular workpiece. As the second electrode plate 420 moves horizontally along the axial direction of the central mold roller 110, the seam of the tubular workpiece is melted. When the second electrode plate 420 moves upward and separates from the tubular workpiece, the tubular workpiece gradually cools down and the seam is firmly welded together.

[0025] As a preferred embodiment, please refer to Figure 3 and Figure 4 The translation assembly 430 includes a first movable seat 431 and a third telescopic driving member 432. The first movable seat 431 is slidably connected to the frame 500 and can move horizontally along the frame 500. The output end of the third telescopic driving member 432 is fixedly connected to the first movable seat 431, and is used to drive the first movable seat 431 to move horizontally along the axial direction of the center mold roller 110. One end of the lifting assembly 440 is connected to the first movable seat 431. By manipulating the third telescopic driving member, the third telescopic driving member 432 drives the first movable seat 431 to move horizontally along the axial direction of the center mold roller 110, and drives the second electrode plate 420 to move horizontally along the axial direction of the center mold roller 110 via the lifting assembly 440.

[0026] As a preferred embodiment, please refer to Figure 3 and Figure 4 The lifting assembly 440 includes a second movable seat 441 and a fourth telescopic driving member 442. The second movable seat 441 is detachably connected to the second electrode plate 420. The fixed end of the fourth telescopic driving member 442 is connected to the first movable seat 431. The output end of the fourth telescopic driving member 442 is fixedly connected to the second movable seat 441 for driving the second movable seat 441 to move up and down. By manipulating the fourth telescopic driving member 442, the fourth telescopic driving member 442 drives the second movable seat 441 to move up and down, and drives the second electrode plate 420 to move up and down.

[0027] As a preferred embodiment, please refer to Figure 2 and Figure 3 The steel plate rolling welding device also includes a pushing mechanism 600, which is used to abut against one end of the extruded tubular workpiece and push the tubular workpiece to move axially along the center mold roller 110 to separate the tubular workpiece from the center mold roller 110. Since the tubular workpiece is in firm contact with the center mold roller 110, it is not easy for people to manually remove the tubular workpiece from the center mold roller 110. The pushing mechanism 600 can separate the tubular workpiece from the center mold roller 110 to avoid manual removal of the workpiece.

[0028] As a preferred embodiment, please refer to Figure 2 and Figure 3 The pushing mechanism 600 includes a pushing plate 610 and a pushing drive assembly 620. The pushing plate 610 is slidably mounted on the center mold roller 110. The pushing drive assembly 620 is connected to the pushing plate 610 and is used to drive the pushing plate 610 to move along the axial direction of the center mold roller 110, so that the pushing plate 610 pushes the tubular workpiece to move along the axial direction of the center mold roller 110 and causes the tubular workpiece to detach from the center mold roller 110. By manipulating the pushing drive assembly 620, the pushing drive assembly 620 can drive the pushing plate 610 to move along the axial direction of the center mold roller 110, so that the pushing plate 610 pushes the tubular workpiece to move along the axial direction of the center mold roller 110 and causes the tubular workpiece to detach from the center mold roller 110.

[0029] As a preferred embodiment, please refer to Figure 3 and Figure 4The push drive assembly 620 includes a third guide frame 621 and a fifth telescopic drive member 622. The third guide frame 621 is slidably connected to the frame 500 and can move horizontally along the frame 500. One end of the third guide frame 621 is fixedly connected to the push plate 610. The output end of the fifth telescopic drive member 622 is fixedly connected to the other end of the third guide frame 621, and is used to drive the third guide frame 621 to move horizontally along the axial direction of the center mold roller 110. By manipulating the fifth telescopic drive member 622, the telescopic end of the fifth telescopic drive member 622 is extended or shortened, which can drive the third guide frame 621 to move horizontally and drive the push plate 610 to move along the axial direction of the center mold roller 110.

[0030] As a preferred embodiment, please refer to Figure 1 and Figure 2 The steel plate rolling welding device also includes a first conveying mechanism 700, which is arranged below the central mold roller 110 and is used to horizontally convey the steel plate to the lower mold base 120, thereby realizing the self-loading function of the steel plate and avoiding manual loading of the steel plate to the lower mold base 120.

[0031] As a preferred embodiment, please refer to Figure 2 and Figure 3 The first conveying mechanism 700 includes two side plates 710, two conveyor belts 720, two annular reciprocating drive assemblies 730 and a baffle 740. The two side plates 710 are relatively arranged on both sides of the central mold roller 110. The two conveyor belts 720 are closed belts and are relatively spaced between the two side plates 710. The lower mold base 120 is located between the two conveyor belts 720. The two annular reciprocating drive assemblies 730 are connected to the two conveyor belts 720 in a one-to-one correspondence and are used to drive the two conveyor belts 720 to synchronously perform annular reciprocating motion. The baffle 740 is arranged at At the end of the two conveyor belts 720, the two ends of the baffle 740 are fixedly connected to the two side plates 710 respectively. The baffle 740 is used to block the steel plate so that the steel plate reaches directly above the lower die base 120. The lower die base 120 is located between the two conveyor belts 720. When the lower die base 120 reaches the bottom of the conveyor belt 720, the steel plate can reach directly above the lower die base 120 under the conveying action of the conveyor belt 720 and the blocking action of the baffle 740. The conveyor belt 720 is a chain plate structure, and the annular reciprocating drive assembly 730 is a gear rack drive structure.

[0032] As a preferred embodiment, please refer to Figure 1The steel plate rolling welding device also includes a second conveying mechanism 800, which is arranged below the central mold roller 110 and above the first conveying mechanism 700, and is used to receive and convey the tubular workpiece pushed out by the pushing mechanism 600, so as to realize the self-feeding function of the tubular workpiece and avoid manual material connection. The second conveying mechanism 800 is a chain plate conveying structure.

[0033] In order to better understand the present invention, the following Figure 1 - Figure 5 The working principle of the technical solution of the present invention is described in detail: When in use, the inlet end of the first conveying mechanism 700 is connected to the outlet end of the upstream processing step, and the outlet end of the second conveying mechanism 800 is connected to the inlet end of the downstream processing step. The steel plate processed by the upstream processing step arrives on the two conveyor belts 720 of the first conveying mechanism 700, and is transported to the top of the lower die base 120 by the two conveyor belts 720, so that the self-loading function of the steel plate can be realized, avoiding manual loading of the lower die base 120. By manipulating the first telescopic driving member 220, the telescopic end of the first telescopic driving member 220 is extended, which can drive the first guide frame 210 to move upward, thereby driving the lower die base 120 to move upward. , the middle part of the steel plate can be brought into contact with the central die roller 110, the lower die holder 120 continues to move upward, the lower die cavity 121 interacts with the central die roller 110, and the steel plate is squeezed into a U-shaped workpiece. By manipulating the two second telescopic driving members 320, the telescopic end of the second telescopic driving member 320 is extended or shortened, and the corresponding second guide frame 310 can be driven to move horizontally, so that the second guide frame 310 is close to the central die roller 110, thereby driving the corresponding upper die holder 130 to move horizontally and bring the upper die holder 130 close to the central die roller 110, so that the two ends of the U-shaped workpiece can be brought into contact with the central die roller 110, and the two upper die holders 130 continue to move close to the The center mold roller 110, the two upper mold cavities 131 interact with the center mold roller 110 to extrude the U-shaped workpiece into a tubular workpiece. By manipulating the lifting assembly 440, the lifting assembly 440 drives the second electrode plate 420 to move downward, so that the bottom of the second electrode plate 420 can be abutted against the seam of the extruded tubular workpiece. At this time, the resistance to the current becomes larger, and a large amount of heat is generated at the seam to melt the contact point of the tubular workpiece, and the second electrode plate 420 applies pressure to the tubular workpiece. As the second electrode plate 420 moves horizontally along the axial direction of the center mold roller 110, the seam of the tubular workpiece is melted. When the second electrode plate 420 moves upward, After the tubular workpieces are separated, they gradually cool down, and the seams are firmly welded together. By manipulating the fifth telescopic drive member 622, the telescopic end of the fifth telescopic drive member 622 is extended, which can drive the third guide frame 621 to move horizontally, and drive the push plate 610 to move axially along the center mold roller 110, and make the tubular workpiece detach from the center mold roller 110. The tubular workpiece enters the second conveying mechanism 800 and is conveyed to the downstream processing step by the second conveying mechanism 800, which can realize the self-feeding function of the tubular workpiece and avoid manual material connection. The present rolling welding device can roll the steel plate with higher precision and can perform in-situ welding on the seams of the can body after rolling.

[0034] The steel plate curling welding device provided by the present invention has the following beneficial effects: (1) The first conveying mechanism 700 is used to horizontally convey the steel plate onto the lower die base 120 , thereby realizing the self-loading function of the steel plate and avoiding manual loading onto the lower die base 120 ; (2) The second conveying mechanism 800 is used to receive and convey the tubular workpiece pushed out by the pushing mechanism 600, so as to realize the self-feeding function of the tubular workpiece and avoid manual material connection; (3) The rolling welding device can roll the steel plate with higher precision and can also perform in-situ welding on the seams of the can body after rolling.

[0035] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A steel plate curling welding device, characterized in that: include: The rolling mechanism comprises a central die roller, a lower die seat and two upper die seats, wherein the central die roller is arranged horizontally, the lower die seat is arranged directly below the central die roller and has a lower die cavity, the lower die seat is used to place the steel plate, and the two upper die seats are respectively arranged on both sides of the central die roller and each has an upper die cavity; A first driving mechanism is connected to the lower die base and is used to drive the lower die base to move up and down so that the middle of the steel plate abuts against the central die roller and squeezes the steel plate into a U-shaped workpiece; Two second driving mechanisms are connected to the two upper die seats in a one-to-one correspondence, and are used to drive the upper die seats to move in a horizontal direction, so that the two ends of the U-shaped workpiece abut against the central die roller, and the U-shaped workpiece is extruded into a tubular workpiece; The welding mechanism is arranged just above the central die roller and is used for welding the butt joints of the tubular workpiece.

2. The steel plate curling welding device according to claim 1, characterized in that: When the lower die seat and the two upper die seats are folded together, the lower die cavity and the two upper die cavities enclose a molding cavity with a columnar structure coaxial with the central die roller.

3. The steel plate curling welding device according to claim 1, characterized in that: It also includes a frame, and one end of the central mold roller is fixedly connected to the frame.

4. The steel plate curling welding device according to claim 1, characterized in that: The central mold roller is provided with a receiving groove extending along its axial direction, the notch of the receiving groove is vertically upward, and the butt joint of the extruded tubular workpiece corresponds to the notch of the receiving groove.

5. The steel plate curling welding device according to claim 4, characterized in that: The welding mechanism includes a first electrode plate, a second electrode plate, a translation assembly, a lifting assembly and a power supply assembly. The first electrode plate is detachably arranged in the accommodating groove along the length direction of the accommodating groove. The top of the first electrode plate is used to abut against the seam of the extruded tubular workpiece. The second electrode plate is arranged above the central die roller and corresponds to the first electrode plate. The translation assembly can move horizontally along the axial direction of the central die roller. One end of the lifting assembly is connected to the translation assembly, and the other end of the lifting assembly is connected to the second electrode plate, which is used to drive the second electrode plate to move up and down so that the bottom of the second electrode plate abuts against the seam of the extruded tubular workpiece. The power supply assembly is electrically connected to the first electrode plate and the second electrode plate.

6. The steel plate curling welding device according to claim 1, characterized in that: It also includes a pushing mechanism, which is used to abut against one end of the extruded tubular workpiece and push the tubular workpiece to move along the axial direction of the central mold roller to separate the tubular workpiece from the central mold roller.

7. The steel plate curling welding device according to claim 6, characterized in that: The pushing mechanism includes a pushing plate and a pushing drive assembly. The pushing plate is slidably mounted on the center mold roller. The pushing drive assembly is connected to the pushing plate and is used to drive the pushing plate to move along the axial direction of the center mold roller, so that the pushing plate pushes the tubular workpiece to move along the axial direction of the center mold roller and causes the tubular workpiece to detach from the center mold roller.

8. The steel plate curling welding device according to claim 6, characterized in that: It also includes a first conveying mechanism, which is arranged below the central mold roller and is used for horizontally conveying the steel plate to the lower mold base.

9. The steel plate curling welding device according to claim 8, characterized in that: The first conveying mechanism includes two side plates, two conveyor belts, two annular reciprocating drive assemblies and a baffle. The two side plates are relatively arranged on both sides of the central mold roller. The two conveyor belts are closed belts and are relatively spaced between the two side plates. The lower mold base is located between the two conveyor belts. The two annular reciprocating drive assemblies are connected to the two conveyor belts one by one and are used to drive the two conveyor belts to perform annular reciprocating motion synchronously. The baffle is arranged at the ends of the two conveyor belts, and the two ends of the baffle are respectively fixedly connected to the two side plates.

10. The steel plate curling welding device according to claim 8, characterized in that: It also includes a second conveying mechanism, which is arranged below the central mold roller and above the first conveying mechanism, and is used to receive and convey the tubular workpiece pushed out by the pushing mechanism.

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