Welding equipment for compression-resistant heat-preservation stainless steel pipe

Abstract

The invention relates to the technical field of stainless steel pipes, and discloses a compression-resistant heat-preservation stainless steel pipe welding device which comprises a workbench, a first mounting plate and a second mounting plate are arranged above the workbench, a first placing plate and a second placing plate are further arranged on the workbench, and the first placing plate and the second placing plate are symmetrical to each other; circular notches are formed in the middles of the first placing plate and the second placing plate, the two circular notches are symmetrical to each other, and a first stainless steel pipe and a second stainless steel pipe are arranged in inner cavities of the two circular notches in a penetrating mode respectively. By starting the driving assembly, the driving assembly can drive the positioning block to accurately position a steel pipe, welding displacement is avoided, meanwhile, the moving plate can be driven to move, the steel pipe can be extruded by the moving plate, a butt joint gap is eliminated, and then the welding butt joint precision of the first stainless steel pipe and the second stainless steel pipe is guaranteed; and a foundation is laid for high-quality welding operation, and finally welding machining of the compression-resistant heat-preservation stainless steel pipe is completed in an assisting mode.

Description

Technical Field

[0001] This invention belongs to the field of stainless steel pipe technology, specifically, it relates to a welding device for pressure-resistant and heat-insulating stainless steel pipes. Background Technology

[0002] In modern industrial systems and public works projects, pressure-resistant and heat-insulating stainless steel pipes, with their excellent mechanical strength, corrosion resistance, and thermal insulation properties, have become core pipe materials in key areas such as petrochemicals, municipal water supply and heating, building water supply and drainage, and new energy transmission. The application scenarios of pressure-resistant and heat-insulating stainless steel pipes continue to expand, and their demand is showing a year-on-year increasing trend. However, the connection quality of this type of pipe directly determines the operational safety and service life of the entire transmission system, among which welding process is the core link to achieve reliable pipe connection.

[0003] Most stainless steel pipe welding equipment on the market is general-purpose equipment. However, the outer diameter of pressure-resistant and heat-insulating stainless steel pipes covers a wide range (from DN50 to DN600), and some pipes have an outer insulation layer thickness of 50-100mm. Traditional welding equipment has a limited chuck clamping range and welding stroke, making it difficult to achieve stable clamping and full-coverage welding of large-diameter pipes and pipes with insulation layers. Frequent changes of tooling fixtures are required, making the operation cumbersome.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A welding device for pressure-resistant and heat-insulating stainless steel pipes includes a workbench. A first mounting plate and a second mounting plate are positioned above the workbench. A first placement plate and a second placement plate are also positioned on the workbench, symmetrical to each other. Each of the first and second placement plates has a circular slot in the middle, symmetrical to each other. A first stainless steel pipe and a second stainless steel pipe are respectively inserted through the inner cavity of each of the two circular slots. Two fixed plates are also positioned above the workbench, symmetrical to each other. A welding assembly is also positioned above the workbench. A top plate is positioned above the first mounting plate, the second mounting plate, the first placement plate, the second placement plate, and the fixed plates. A movable plate is also positioned on one side wall opposite to the two fixed plates on the workbench. A driving assembly and multiple equidistantly distributed positioning blocks are also positioned on the workbench. The driving assembly drives the positioning blocks to move towards the first and second stainless steel pipes, and also drives the movable plate to move.

[0006] In a preferred embodiment of the present invention, connecting blocks are provided on all four sides of the opposite side wall of the first mounting plate and the second mounting plate, and the two ends of the four connecting blocks are respectively connected to the first mounting plate and the second mounting plate. A first cross groove is provided through the middle of the second mounting plate.

[0007] In a preferred embodiment of the present invention, a second cross-shaped groove is provided through the middle of the first placement plate and the second placement plate, and the two second cross-shaped grooves are interconnected with the first cross-shaped groove.

[0008] In a preferred embodiment of the present invention, the drive assembly includes a servo motor, which is disposed on a side wall of the first mounting plate away from the second mounting plate. A rotating rod is disposed at the output end of the servo motor, which movably passes through the first mounting plate. A bearing is disposed at the end of the rotating rod away from the servo motor, and the bearing is disposed on the second mounting plate.

[0009] In a preferred embodiment of the present invention, a circular mounting plate is provided between the first mounting plate and the second mounting plate. The circular mounting plate has three arc-shaped sliding grooves on one side wall near the second mounting plate. The three arc-shaped sliding grooves are distributed in a semi-circular manner. Each of the three arc-shaped sliding grooves has a movable slider slidably disposed in its inner cavity. The three movable sliders are distributed in a circumferential manner.

[0010] In a preferred embodiment of the present invention, each of the three movable sliders is provided with an upper connecting rod and two side connecting rods at one end away from the arc-shaped groove. The upper connecting rod and the two side connecting rods are distributed in a semi-circular pattern and respectively movably pass through the first cross groove and the second cross groove.

[0011] In a preferred embodiment of the present invention, the upper connecting rod and the two side connecting rods are provided with a plurality of connecting rods that are equidistantly distributed on one side wall of the first stainless steel tube and the second stainless steel tube, respectively, and each connecting rod is provided with a positioning block at one end away from the upper connecting rod and the two side connecting rods.

[0012] In a preferred embodiment of the present invention, two mounting brackets are provided on the opposite side wall of the first placement plate and the second placement plate, and a plurality of mounting rods are provided on the opposite side wall of the two mounting brackets. Each mounting rod is provided with a limiting plate at one end away from the first placement plate and the second placement plate, and the two limiting plates are symmetrical to each other.

[0013] In a preferred embodiment of the present invention, guide grooves are provided on the opposite side walls of the two fixed plates, the two guide grooves are symmetrical to each other, guide sliders are slidably arranged in the inner cavities of the two guide grooves, the two guide sliders are symmetrical to each other, swing arms are provided between the two guide sliders and the two side connecting rods respectively, the two ends of the two swing arms are respectively movably arranged on the guide sliders and the side connecting rods, and rectangular telescopic rods are provided above the two guide sliders, the two rectangular telescopic rods are symmetrical to each other.

[0014] In a preferred embodiment of the present invention, inclined sliding grooves are provided on the opposite side walls of the two fixed plates, the two inclined sliding grooves are symmetrical to each other, sliding blocks are slidably arranged in the inner cavities of the two inclined sliding grooves, the two sliding blocks are symmetrical to each other, a movable plate is provided on the opposite side wall of the two sliding blocks, a rectangular telescopic rod is connected to the bottom of the movable plate, a multi-stage telescopic rod is provided at the end of the movable plate near the second placement plate, and the end of the multi-stage telescopic rod away from the second placement plate is provided at the upper connecting rod port.

[0015] Compared with the prior art, the present invention has the following advantages: This invention, by placing the first and second stainless steel pipes and then activating the drive assembly, enables the drive assembly to precisely position the steel pipes using the positioning block, preventing welding displacement. Simultaneously, it drives the moving plate to move, allowing the moving plate to compress the steel pipes and eliminate the joint gap. This ensures the welding precision of the first and second stainless steel pipes, laying the foundation for high-quality welding operations and ultimately facilitating the welding of the pressure-resistant and heat-insulating stainless steel pipes.

[0016] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0017] In the attached diagram: Figure 1 A three-dimensional structural diagram of a welding equipment for pressure-resistant and heat-insulating stainless steel pipes; Figure 2 A bottom view schematic diagram of a welding equipment for pressure-resistant and heat-insulating stainless steel pipes; Figure 3 A partial (I) structural schematic diagram of a welding equipment for pressure-resistant and heat-insulating stainless steel pipes; Figure 4 A partial (II) structural schematic diagram of a welding equipment for pressure-resistant and heat-insulating stainless steel pipes; Figure 5 A schematic diagram of a circular mounting plate structure for welding equipment of pressure-resistant and heat-insulating stainless steel pipes; Figure 6 A partial (III) structural schematic diagram of a welding equipment for pressure-resistant and heat-insulating stainless steel pipes; Figure 7 This is a partial (fourth) structural schematic diagram of a welding equipment for pressure-resistant and heat-insulating stainless steel pipes.

[0018] In the picture: 1. Workbench; 12. First mounting plate; 121. Second mounting plate; 122. Connecting block; 123. First cross groove; 13. First placement plate; 131. Second placement plate; 132. Second cross groove; 133. Circular groove; 14. Fixing plate; 15. Top plate; 16. First stainless steel pipe; 161. Second stainless steel pipe; 17. Welding assembly; 2. Servo motor; 21. Rotary rod; 211. Bearing; 22. Circular mounting plate; 221. Arc-shaped slide groove; 222. Moving slider; 23. Upper connecting rod; 231. Side connecting rod; 232. Connecting rod; 233. Positioning block; 24. Mounting bracket; 241. Mounting rod; 242. Limiting plate; 4. Guide slide; 41. Guide slider; 411. Rectangular telescopic rod; 412. Swing arm; 42. Inclined slide; 421. Sliding block; 422. Multi-stage telescopic rod; 43. Moving plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0020] Example 1: like Figures 1 to 7As shown, a welding device for pressure-resistant and heat-insulating stainless steel pipes includes a workbench 1. A first mounting plate 12 and a second mounting plate 121 are arranged above the workbench 1. A first placement plate 13 and a second placement plate 31 are also arranged on the workbench 1. The first placement plate 13 and the second placement plate 131 are symmetrical to each other. A circular slot 133 is formed in the middle of both the first placement plate 13 and the second placement plate 131. The two circular slots 133 are symmetrical to each other, and a first stainless steel pipe 16 and a second stainless steel pipe 161 are respectively inserted through the inner cavity of the two circular slots 133. Two fixing plates 14 are also arranged above the workbench 1. The fixed plates 14 are symmetrical to each other. A welding assembly 17 is also provided above the worktable 1. A top plate 15 is provided above the first mounting plate 12, the second mounting plate 121, the first placement plate 13, the second placement plate 31, and the fixed plates 14. A movable plate 43 is also provided on the worktable 1, which is located on one side wall opposite to the two fixed plates 14. A drive assembly and multiple equidistantly distributed positioning blocks 233 are also provided on the worktable 1. The drive assembly is used to drive the positioning blocks 233 to move towards the first stainless steel pipe 16 and the second stainless steel pipe 161. The drive assembly is also used to drive the movable plate 43 to move. After the first stainless steel pipe 16 and the second stainless steel pipe 161 are placed, the drive assembly is activated. This allows the drive assembly to drive the positioning blocks 233 to accurately position the steel pipes, avoiding welding displacement. At the same time, it can also drive the movable plate 43 to move, allowing the movable plate 43 to squeeze the steel pipes and eliminate the butt joint gap. This ensures the welding butt joint accuracy of the first stainless steel pipe 16 and the second stainless steel pipe 161, laying the foundation for high-quality welding operations and ultimately helping to complete the welding processing of the pressure-resistant and heat-insulating stainless steel pipes.

[0021] like Figures 1 to 4 and Figures 6 to 7 As shown in the specific embodiment, connecting blocks 122 are provided around the four sides of the opposite side wall of the first mounting plate 12 and the second mounting plate 121. The two ends of the four connecting blocks 122 are respectively connected to the first mounting plate 12 and the second mounting plate 121. A first cross-shaped groove 123 is formed through the middle of the second mounting plate 121. In this configuration, the installation positions of the first mounting plate 12 and the second mounting plate 121 and the opening position of the first cross-shaped groove 123 are determined.

[0022] like Figures 1 to 4 and Figures 6 to 7 As shown, furthermore, a second cross-shaped slot 132 is provided through the middle of both the first placement plate 13 and the second placement plate 131, and the two second cross-shaped slots 132 are interconnected with the first cross-shaped slot 123. In this configuration, the opening position of the second cross-shaped slot 132 and the relationship between the second cross-shaped slot 132 and the first cross-shaped slot 123 are determined.

[0023] Example 2: The difference between Embodiment 1 and this embodiment is that: Figures 1 to 7 As shown, a welding device for pressure-resistant and heat-insulating stainless steel pipes includes a drive assembly comprising a servo motor 2. The servo motor 2 is disposed on a side wall of a first mounting plate 12 away from a second mounting plate 121. A rotating rod 21 is disposed at the output end of the servo motor 2, and the rotating rod 21 movably passes through the first mounting plate 12. A bearing 211 is disposed at the end of the rotating rod 21 away from the servo motor 2, and the bearing 211 is disposed on the second mounting plate 121. In this configuration, the installation position and components of the drive assembly are defined.

[0024] like Figures 1 to 7 As shown, in a specific embodiment, a circular mounting plate 22 is provided between the rotating rod 21 and the first mounting plate 121. Three arc-shaped grooves 221 are formed on one side wall of the circular mounting plate 22 near the second mounting plate 121. The three arc-shaped grooves 221 are semi-circularly distributed, and movable sliders 222 are slidably disposed within the inner cavity of each of the three arc-shaped grooves 221. The three movable sliders 222 are circumferentially distributed. In this configuration, the installation position of the circular mounting plate 22 and the opening position of the arc-shaped grooves 221 are determined.

[0025] like Figures 1 to 4 and Figures 6 to 7 As shown, furthermore, each of the three movable sliders 222 has an upper connecting rod 23 and two side connecting rods 231 respectively at its end away from the arc-shaped slide groove 221. The upper connecting rod 23 and the two side connecting rods 231 are arranged in a semi-circular distribution, and the upper connecting rod 23 and the two side connecting rods 231 respectively movably pass through the first cross groove 123 and the second cross groove 132. In this configuration, the installation positions of the upper connecting rod 23 and the side connecting rods 231 are determined to ensure that they can move with the assistance of the first cross groove 123 and the second cross groove 132.

[0026] like Figures 1 to 4 and Figures 6 to 7 As shown, furthermore, multiple equidistant connecting rods 232 are provided on one side wall of the upper connecting rod 23 and the two side connecting rods 231 near the first stainless steel pipe 16 and the second stainless steel pipe 161, respectively. A positioning block 233 is provided at one end of each connecting rod 232 away from the upper connecting rod 23 and the two side connecting rods 231. In this configuration, the installation position of the positioning block 233 is determined.

[0027] Example 3: The difference between Embodiment 2 and this embodiment is that: Figures 1 to 4 and Figures 6 to 7As shown, a welding device for pressure-resistant and heat-insulating stainless steel pipes includes two mounting brackets 24 on opposite side walls of a first placement plate 13 and a second placement plate 131. Multiple equidistant mounting rods 241 are arranged on the opposite side walls of each mounting bracket 24. A limiting plate 242 is provided at one end of each mounting rod 241 away from the first and second placement plates 131, and the two limiting plates 242 are symmetrical. In this configuration, the installation position of the limiting plates 242 is determined.

[0028] like Figures 1 to 4 and Figures 6 to 7As shown, in a specific embodiment, guide grooves 4 are provided on the opposite side walls of the two fixed plates 14. The two guide grooves 4 are symmetrical to each other. Guide sliders 41 are slidably arranged in the inner cavities of the two guide grooves 4. The two guide sliders 41 are symmetrical to each other. A swing arm 412 is provided between the two guide sliders 41 and the two side connecting rods 231 respectively. The two ends of the two swing arms 412 are movably arranged on the guide sliders 41 and the side connecting rods 231 respectively. A rectangular telescopic rod 411 is provided above the two guide sliders 41. The two rectangular telescopic rods 411 are symmetrical to each other. An inclined slide groove 42 is provided on one side wall opposite to the two fixed plates 14. The two inclined slide grooves 42 are symmetrical to each other. A sliding block 421 is slidably arranged in the inner cavity of the two inclined slide grooves 42. The two sliding blocks 421 are symmetrical to each other. A movable plate 43 is provided on one side wall opposite to the two sliding blocks 421. A rectangular telescopic rod 411 is connected to the bottom of the movable plate 43. A multi-stage telescopic rod 422 is provided at one end of the movable plate 43 near the second placement plate 131. The end of the multi-stage telescopic rod 422 away from the second placement plate 131 is provided at the port of the upper connecting rod 23. In this configuration, when the side connecting rod 231 moves towards one side of the two stainless steel tubes, it pulls the guide slider 41 on the fixed plate 14 via the swing arms 412, which are respectively movably mounted on the guide slider 41 and the side connecting rod 231. When the guide slider 41 slides, it drives the symmetrical rectangular telescopic rods 411 mounted above it to move horizontally in sync, thereby pulling the moving plate 43 connected to the rectangular telescopic rods 411 to move. At the same time, as the upper connecting rod 23 moves towards one side of the two stainless steel tubes, it moves downward in sync. When the upper connecting rod 23 moves downward, it drives the moving plate 43, with one end mounted at its port and the other end mounted near the second placement plate 131, to move. The multi-stage telescopic rod 422 moves downward, further pulling the moving plate 43 downward. The moving plate 43 is slidably disposed on both sides of the inclined groove 42 opened on the opposite side wall of the fixed plate 14 through the sliding block 421. Under the guidance of the inclined groove 42, the moving plate 43 finally achieves a combined downward and horizontal movement. During this movement, the moving plate 43 will exert stable pressure on the end of the second stainless steel pipe 161 away from the first stainless steel pipe 16, further ensuring that the joint between the first stainless steel pipe 16 and the second stainless steel pipe 161 is tightly fitted, eliminating the joint gap to a certain extent, and laying the foundation for high-quality welding.

[0029] The implementation principle of the welding equipment for pressure-resistant and heat-insulating stainless steel pipes of the present invention is as follows: Before welding, the workers first pass the first stainless steel pipe 16 through the circular slots 133 (the two circular slots 133 are symmetrical) in the middle of the first placement plate 13 and the second placement plate 131, so that one end of the first stainless steel pipe 16 is attached to the second mounting plate 121 (connecting blocks 122 are provided around the side wall opposite to the first mounting plate 12 and the second mounting plate 121, and the two ends of the four connecting blocks 122 are respectively connected to the two mounting plates to ensure a stable connection between the two mounting plates). Then, the second stainless steel pipe 161 is placed in the same way through the corresponding circular slots 133 and the initial positioning is completed. At the same time, the two mounting brackets 24 provided on the side wall opposite to the first placement plate 13 and the second placement plate 131 drive the limiting plate 242 (the two limiting plates 242 are symmetrical) through the multiple equally spaced mounting rods 241 on their respective opposite side walls, which plays an auxiliary limiting role in the placement of the two stainless steel pipes and prevents the steel pipes from shifting during placement. After the first stainless steel tube 16 and the second stainless steel tube 161 are placed, the operator controls the servo motor 2 in the drive assembly to run (the servo motor 2 is located on the side wall of the first mounting plate 12 away from the second mounting plate 121). The output end of the servo motor 2 drives the rotating rod 21 to rotate. The end of the rotating rod 21 that passes through the first mounting plate 12 and is away from the servo motor 2 is mounted on the second mounting plate 121 through a bearing 211 (to ensure the stability of the rotation of the rotating rod 21). When the rotating rod 21 rotates, it synchronously drives the circular mounting plate 22 located between the first mounting plate 12 and the second mounting plate 121 to rotate. The side wall of the circular mounting plate 22 near the second mounting plate 121 has three semi-circular arc-shaped grooves 221. The inner cavity of each of the three arc-shaped grooves 221 is slidably equipped with a circumferentially distributed movable slider 222. When the circular mounting plate 22 rotates, the movable slider 222 slides in the arc-shaped grooves 221, thereby driving the three movable sliders 222 to move away from the upper connecting rod 23 and the two side connecting rods 221 respectively. 31 (the upper connecting rod 23 and the two side connecting rods 231 are arranged in a semi-circular distribution) moves, and the upper connecting rod 23 and the two side connecting rods 231 respectively move through the first cross slot 123 opened in the middle of the second mounting plate 121 and the second cross slot 132 opened in the middle of the first placement plate 13 and the second placement plate 131 (the two second cross slots 132 are interconnected with the first cross slot 123, providing guidance for the movement of the rod body), so that the upper connecting rod 23 and the two side connecting rods 231 move closer to the outer wall of the first stainless steel tube 16 and the second stainless steel tube 161; at this time, the upper connecting rod 23 and the two side connecting rods 231 respectively approach the multiple equidistant connecting rods 232 set near one side wall of the two stainless steel tubes, driving the positioning block 233 at the end of each connecting rod 232 away from the rod body to move synchronously. Through the contact of the positioning block 233 with the outer wall of the two stainless steel tubes, the first stainless steel tube 16 and the second stainless steel tube 161 are accurately positioned, effectively avoiding displacement of the steel tubes during subsequent welding and ensuring welding accuracy. While the positioning block 233 positions the steel pipe, the side connecting rod 231 moves towards one side of the two stainless steel pipes. This is achieved by the swing arms 412, which are movably mounted on the guide slider 41 and the side connecting rod 231 respectively. The swing arms 412 pull the guide slider 41 horizontally within the guide groove 4 (two symmetrically positioned guide grooves 4) on opposite side walls of the fixed plate 14 (two symmetrically positioned fixed plates 14 are located above the workbench 1, and the top plate 15 covers the first mounting plate 12, the second mounting plate 121, the first placement plate 13, the second placement plate 131, and the fixed plate 14). As the guide slider 41 slides, it drives the symmetrically positioned rectangular telescopic rods 411 above it to move horizontally simultaneously, thereby pulling the moving plate 43 (located on opposite side walls of the two fixed plates 14) connected to the rectangular telescopic rods 411 to move horizontally. Simultaneously, the upper connecting rod 23 moves towards one side of the two stainless steel pipes. During the process, the upper connecting rod 23 moves downward synchronously. When the upper connecting rod 23 moves downward, it drives the multi-stage telescopic rod 422, which has one end set at its port and the other end set at the end of the moving plate 43 near the second placement plate 131, to move downward. The multi-stage telescopic rod 422 moves downward and further pulls the moving plate 43 downward. The two sides of the moving plate 43 are slidably set in the inner cavity of the inclined slide groove 42 (two inclined slide grooves 42 are symmetrical) opened on the opposite side wall of the fixed plate 14 through the sliding blocks 421 (two sliding blocks 421 are symmetrical to each other). Under the guidance of the inclined slide groove 42, the moving plate 43 finally achieves a composite movement of tilting downward and horizontal. During this movement, the moving plate 43 will exert a stable squeeze on the end of the second stainless steel pipe 161 away from the first stainless steel pipe 16, further ensuring that the joint between the first stainless steel pipe 16 and the second stainless steel pipe 161 is tightly fitted, eliminating the joint gap to a certain extent and laying the foundation for high-quality welding. After the first stainless steel pipe 16 and the second stainless steel pipe 161 are positioned and tightly connected, the staff controls the welding assembly 17 set above the workbench 1 to start. Under the support and protection of the top plate 15, the welding assembly 17 performs welding operations on the relative connection between the first stainless steel pipe 16 and the second stainless steel pipe 161, and finally completes the welding process of the pressure-resistant and heat-insulating stainless steel pipe.

Claims

1. A welding device for pressure-resistant and heat-insulating stainless steel pipes, comprising a workbench (1), characterized in that: A first mounting plate (12) and a second mounting plate (121) are provided above the workbench (1). A first placement plate (13) and a second placement plate (31) are also provided on the workbench (1). The first placement plate (13) and the second placement plate (131) are symmetrical to each other. A circular slot (133) is opened in the middle of the first placement plate (13) and the second placement plate (131). The two circular slots (133) are symmetrical to each other. A first stainless steel pipe (16) and a second stainless steel pipe (161) are respectively passed through the inner cavity of the two circular slots (133). Two fixing plates (14) are also provided above the workbench (1). The two fixing plates (14) are symmetrical to each other. A welding assembly (17) is also provided above the workbench (1). A top plate (15) is provided above the first mounting plate (12), the second mounting plate (121), the first placement plate (13), the second placement plate (31), and the fixing plate (14). The workbench (1) is also provided with a movable plate (43), which is located on one side wall opposite to the two fixed plates (14); The workbench (1) is also provided with a drive assembly and a plurality of equidistantly distributed positioning blocks (233). The drive assembly is used to drive the positioning blocks (233) to move toward the first stainless steel pipe (16) and the second stainless steel pipe (161). The drive assembly is also used to drive the moving plate (43) to move.

2. The welding equipment for pressure-resistant and heat-insulating stainless steel pipes according to claim 1, characterized in that, Connecting blocks (122) are provided on all four sides of the opposite side wall of the first mounting plate (12) and the second mounting plate (121). The two ends of the four connecting blocks (122) are respectively connected to the first mounting plate (12) and the second mounting plate (121). The second mounting plate (121) has a first cross groove (123) through it.

3. The welding equipment for pressure-resistant and heat-insulating stainless steel pipes according to claim 1, characterized in that, The first placement plate (13) and the second placement plate (131) are both provided with a second cross groove (132) through the middle, and the two second cross grooves (132) and the first cross groove (123) are interconnected.

4. The welding equipment for pressure-resistant and heat-insulating stainless steel pipes according to claim 1, characterized in that, The drive assembly includes a servo motor (2), which is disposed on a side wall of the first mounting plate (12) away from the second mounting plate (121). The output end of the servo motor (2) is provided with a rotating rod (21), which moves through the first mounting plate (12). The end of the rotating rod (21) away from the servo motor (2) is provided with a bearing (211), which is disposed on the second mounting plate (121).

5. The welding equipment for pressure-resistant and heat-insulating stainless steel pipes according to claim 4, characterized in that, The rotating rod (21) is provided with a circular mounting plate (22) between the first mounting plate (12) and the second mounting plate (121). The circular mounting plate (22) has three arc-shaped sliding grooves (221) on one side wall near the second mounting plate (121). The three arc-shaped sliding grooves (221) are distributed in a semi-circular manner. The inner cavity of each of the three arc-shaped sliding grooves (221) is slidably provided with a movable slider (222). The three movable sliders (222) are distributed in a circular manner.

6. The welding equipment for pressure-resistant and heat-insulating stainless steel pipes according to claim 5, characterized in that, The three movable sliders (222) are respectively provided with an upper connecting rod (23) and two side connecting rods (231) at one end away from the arc-shaped slide groove (221). The upper connecting rod (23) and the two side connecting rods (231) are distributed in a semi-circular shape. The upper connecting rod (23) and the two side connecting rods (231) respectively move through the first cross groove (123) and the second cross groove (132).

7. The welding equipment for pressure-resistant and heat-insulating stainless steel pipes according to claim 6, characterized in that, The upper connecting rod (23) and the two side connecting rods (231) are provided with multiple connecting rods (232) that are equidistantly distributed on one side wall of the first stainless steel pipe (16) and the second stainless steel pipe (161), respectively. Each connecting rod (232) is provided with a positioning block (233) at one end away from the upper connecting rod (23) and the two side connecting rods (231).

8. The welding equipment for pressure-resistant and heat-insulating stainless steel pipes according to claim 1, characterized in that, Two mounting brackets (24) are provided on the opposite side wall of the first placement plate (13) and the second placement plate (131). Multiple mounting rods (241) are provided on the opposite side wall of the two mounting brackets (24). Each mounting rod (241) has a limiting plate (242) at one end away from the first placement plate (13) and the second placement plate (131). The two limiting plates (242) are symmetrical to each other.

9. The welding equipment for pressure-resistant and heat-insulating stainless steel pipes according to claim 1, characterized in that, The two fixed plates (14) are provided with guide grooves (4) on opposite side walls. The two guide grooves (4) are symmetrical to each other. The inner cavity of the two guide grooves (4) is provided with guide sliders (41). The two guide sliders (41) are symmetrical to each other. The two guide sliders (41) are provided with swing arms (412) between each of the two guide sliders (41) and the two side connecting rods (231). The two ends of the two swing arms (412) are respectively movably disposed on the guide sliders (41) and the side connecting rods (231). The two guide sliders (411) are provided with rectangular telescopic rods (411) above each of the two guide sliders (41). The two rectangular telescopic rods (411) are symmetrical to each other.

10. The welding equipment for pressure-resistant and heat-insulating stainless steel pipes according to claim 9, characterized in that, An inclined slide groove (42) is provided on one side wall opposite to the two fixed plates (14). The two inclined slide grooves (42) are symmetrical to each other. A sliding block (421) is slidably arranged in the inner cavity of the two inclined slide grooves (42). The two sliding blocks (421) are symmetrical to each other. A movable plate (43) is provided on one side wall opposite to the two sliding blocks (421). A rectangular telescopic rod (411) is connected to the bottom of the movable plate (43). A multi-stage telescopic rod (422) is provided at one end of the movable plate (43) near the second placement plate (131). The end of the multi-stage telescopic rod (422) away from the second placement plate (131) is provided at the port of the upper connecting rod (23).

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