A welding positioning device for nitrogen pressure pipelines

Abstract

This invention discloses a welding positioning device for nitrogen pressure pipelines, relating to the field of pipeline welding technology. It includes a base, above which is a straight pipe positioning mechanism for centrally clamping a straight pipe. This nitrogen pressure pipeline welding positioning device uses the straight pipe positioning mechanism to centrally position and clamp the straight pipe of the nitrogen pressure pipeline. A positioning plate of a flipping mechanism positions the straight pipe, and then the device moves and flips to a bend support away from the support frame to place the bend. A bend positioning mechanism provides anti-deviation positioning and clamping for the bend. When the flipping mechanism moves the bend support along the transfer seat to a position close to the support frame, the step-positioned straight and bend pipes approach and abut each other, achieving anti-angle deviation positioning and anti-position deviation positioning before welding. Furthermore, the alternating approach of the grinding and welding components allows for high-quality welding of the pipe joint edges.

Description

Technical Field

[0001] This invention relates to the field of pipeline welding technology, specifically to a welding positioning device for nitrogen pressure pipelines. Background Technology

[0002] Nitrogen pressure pipelines are specialized pipelines used to transport nitrogen, ensuring its safe transmission and use. The manufacturing process involves merging two separate pipelines and then welding them using appropriate welding equipment. To ensure welding quality, surface oxide removal and slag polishing are typically performed before and after welding using grinding techniques.

[0003] During the welding of conventional straight pipes in nitrogen pressure pipelines, manual clamping is required to align and hold the two pipes. However, when welding straight and bent pipes, it is often necessary to position the straight pipe and the bent pipe simultaneously. There will be angular and positional deviations in the positioning methods and angles of the straight and bent pipes. Furthermore, the conventional positioning method can easily affect the efficiency of pipe loading and unloading during the welding process. Summary of the Invention

[0004] The purpose of this invention is to provide a welding positioning device for nitrogen pressure pipelines to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a welding positioning device for a nitrogen pressure pipeline, comprising a base, a straight pipe positioning mechanism for centrally clamping a straight pipe is provided above the base, a switching mechanism for switching the pipe butt joint edge for grinding and welding is provided on the straight pipe positioning mechanism, and a transfer seat is installed on the side of the base near the support frame, and a bent pipe support is provided inside the transfer seat for moving and placing a bent pipe along the transfer seat; The bend support is provided with a bend positioning mechanism for positioning and clamping bends with intermittently reversed placement angles. The bend positioning mechanism includes an electric push rod movably connected to the outer wall of the bend support. The inner side of the bend support is connected to an active clamping roller and a driven clamping roller via a rotating shaft. The active clamping roller and the driven clamping roller are used to deflect and clamp the inner bend of the bend. The outer side of the transfer seat is provided with a flipping mechanism that drives the bent tube support to move horizontally and rotate 90° within the transfer seat. Two bearing seats are connected between the base and the transfer seat. The flipping mechanism includes a deflection shaft that passes through the two bearing seats respectively. The deflection shafts located on the two bearing seats are coaxially separated. The ends of the mutually separated deflection shafts are respectively fixed with a fan-shaped plate and a support plate. A push-pull rod is movably connected to the support plate of the deflection shaft. A positioning plate that is pushed, pulled and flipped by the push-pull rod is hinged to one end of the transfer seat near the support frame. The positioning plate is used to position and align the horizontally positioned and clamped straight pipe end to be welded.

[0006] Preferably, the straight tube positioning mechanism is horizontally supported by a support frame mounted on the base, and a drive device is mounted on the side of the support frame. The drive device consists of a drive motor and a drive gear located at the output end of the drive motor.

[0007] Preferably, the straight pipe positioning mechanism includes a limiting cylinder installed inside the support frame, and guide rings are symmetrically installed at both ends of the limiting cylinder; A turntable slides coaxially on the side of the guide ring away from the limiting cylinder. A rack is provided on the inner wall of the turntable, and an inclined groove is opened on the surface of the turntable. A guide cavity perpendicular to the axis of the guide ring is opened on the surface of the guide ring, and a clamping block is inserted into the inclined groove and the guide cavity. A parallel guide shaft and a cylinder are arranged between two guide rings. An adjusting gear is fixed to the end of the guide shaft that extends through the guide ring, and a spiral groove is opened on the circumferential side surface of the guide shaft. The tail of the cylinder is installed on the surface of one of the guide rings, and the output end of the cylinder is connected to the spiral groove through a sliding pin. The outer side of the limiting cylinder is connected to a geared disc driven to rotate by a driving device via a bearing sleeve.

[0008] Preferably, the switching mechanism includes a lead screw module and a slide mounted symmetrically on the outer side of the gear plate, and a fixed frame that moves along the lead screw module and the slide is connected between the lead screw module and the slide. The fixed frame is equipped with grinding and welding components at both ends. The fixed frame, which moves back and forth along the screw module and slide, can drive the grinding and welding components to alternately approach the pipe.

[0009] Preferably, the transfer seat has sliding grooves on both sides, which are formed by a horizontal channel and a curved channel at the end of the horizontal channel. Horizontal rails are embedded on both sides of the inner wall of the transfer seat, and a rotatable circular concave block is magnetically embedded at one end of the horizontal rail near the curved channel.

[0010] Preferably, a lever that passes through the middle of the bend support and slides through the groove is provided, a baffle that fits and blocks one end of the bend is installed on one side of the bend support, a moving pin that moves along the horizontal track to prevent deviation is fixed on the outer corner of the bend support, and a U-shaped opening that matches the size of the moving pin is provided in the middle of the circular concave block.

[0011] Preferably, the contact points between the active and driven clamping rollers and the bend are designed with a spherical surface, which can clamp the inner bend of the bend in a centered manner. The curved tube support has arc-shaped openings on both sides, and the rotating shaft of the driven clamping roller is inserted into the arc-shaped opening. The arc-shaped opening and the rotating shaft of the active clamping roller are arranged on the same axis. The output end of the electric actuator is connected to the rotating shaft of the active clamping roller via a traction arm. Both the active and driven clamping rollers are equipped with meshing transmission gears.

[0012] Preferably, the curved pipe support has notches on both sides of the arc-shaped opening, and a pressure plate is hinged in the notch to fit and press against the rotating shaft, and a tension spring is connected between one end of the pressure plate and the inner wall of the notch.

[0013] Preferably, a flap is sleeved at one end of the deflection shaft near the sector plate, and the surface of the flap is provided with a sector-shaped opening for the sector plate to deflect, the arc length of the sector-shaped opening being greater than the arc length of the sector plate.

[0014] Preferably, the base is hinged with a hydraulic rod that engages with the flip plate, and the surface of the flip plate has an inner cavity that engages with the lever.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The welding positioning device for the nitrogen pressure pipeline uses a straight pipe positioning mechanism to center and clamp the straight pipe of the nitrogen pressure pipeline, and uses the positioning plate of the flipping mechanism to position the straight pipe in a movable position. Then, the bend pipe is placed by moving and flipping to a bend pipe support away from the support frame. The bend pipe is positioned and clamped to prevent deviation using the bend pipe positioning mechanism. When the flipping mechanism drives the bend pipe support to move along the transfer seat to a position close to the support frame, the step-positioned straight pipe and bend pipe achieve anti-angle deviation positioning and anti-position deviation positioning before welding when they approach and abut each other. Furthermore, the grinding component and welding component that alternately approach the pipeline can perform high-quality welding processing on the pipeline mating edge. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the welding positioning device for welding straight and bent pipes according to the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the welding positioning device after welding straight and bent pipes according to the present invention; Figure 3 This is a three-dimensional cross-sectional structural diagram of the linkage between the straight pipe positioning mechanism and the switching mechanism of the present invention; Figure 4 This is a three-dimensional exploded view of the straight pipe positioning mechanism of the present invention; Figure 5 This is a three-dimensional structural diagram of the separation of the guide ring and the turntable in this invention; Figure 6 This is a three-dimensional structural diagram of the switching mechanism of the present invention; Figure 7 This is a three-dimensional structural diagram of the linkage between the transfer seat, the bent tube support, the bent tube positioning mechanism, and the flipping mechanism of the present invention. Figure 8This is a three-dimensional structural diagram of the linkage between the transfer seat, the bent tube support, and the bent tube positioning mechanism of the present invention. Figure 9 This is a three-dimensional structural diagram of the linkage between the pipe bending support and the pipe bending positioning mechanism of the present invention. Figure 10 This is a side view of the linkage between the pipe bend support and the pipe bend positioning mechanism of the present invention. Figure 11 This is a three-dimensional structural diagram of the flipping mechanism of the present invention; Figure 12 For the present invention Figure 9 A magnified schematic diagram of the structure at point A in the middle.

[0017] In the diagram: 1. Base; 2. Support frame; 201. Drive device; 3. Straight tube positioning mechanism; 301. Limiting cylinder; 302. Guide ring; 303. Turntable; 3031. Rack; 3032. Clamping block; 304. Guide shaft; 3041. Spiral groove; 3042. Adjusting gear; 305. Cylinder; 3051. Sliding pin; 306. Gear plate; 4. Switching mechanism; 401. Lead screw module; 402. Slide seat; 403. Fixing frame; 404. Grinding assembly; 405. Welding assembly; 5. Transfer seat; 501. Slide groove; 502. Horizontal track; 503. Circular concave block; 6. Bent pipe support; 601. Lever; 602. Baffle; 603. Moving pin; 7. Bent pipe positioning mechanism; 701. Electric actuator; 702. Traction arm; 703. Active clamping roller; 704. Arc-shaped opening; 705. Driven clamping roller; 706. Transmission gear; 707. Tension spring; 708. Pressure plate; 8. Tilting mechanism; 801. Flip plate; 802. Deflection shaft; 803. Hydraulic rod; 804. Fan-shaped opening; 805. Fan-shaped plate; 806. Push-pull rod; 807. Positioning plate. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-4 and Figure 6The present invention provides a technical solution: a welding positioning device for a nitrogen pressure pipeline, including a base 1, a straight pipe positioning mechanism 3 for centrally clamping a straight pipe is provided above the base 1, the straight pipe positioning mechanism 3 is horizontally supported by a support frame 2 installed on the base 1, and a driving device 201 is installed on the side of the support frame 2. The driving device 201 consists of a drive motor and a drive gear located at the output end of the drive motor. By using the horizontal support of the straight pipe positioning mechanism 3 by the support frame 2, the straight pipe clamped by the straight pipe positioning mechanism 3 can be placed horizontally.

[0020] Please see Figures 2-5 The straight pipe positioning mechanism 3 includes a limiting cylinder 301 installed inside the support frame 2. Guide rings 302 are symmetrically installed at both ends of the limiting cylinder 301. A turntable 303 is slidably mounted on the side of the guide ring 302 away from the limiting cylinder 301. A rack 3031 is provided on the inner wall of the turntable 303, and a groove is opened on the surface of the turntable 303. A guide cavity is opened on the surface of the guide ring 302 perpendicular to the axis of the guide ring 302. A clamping block 3032 is inserted into the groove and the guide cavity. A parallel guide shaft 304 and a cylinder 305 are arranged between two guide rings 302. An adjusting gear 3042 is fixed to the end of the guide shaft 304 that extends through the guide ring 302. A spiral groove 3041 is opened on the circumferential side surface of the guide shaft 304. The tail of the cylinder 305 is installed on the surface of one of the guide rings 302. The output end of the cylinder 305 is connected to the spiral groove 3041 through a sliding pin 3051. A gear disk 306 driven to rotate by the driving device 201 is sleeved on the outside of the limiting cylinder 301 through a bearing. The tooth surface of the gear disk 306 meshes with the driving gear of the driving device 201.

[0021] In this embodiment, the straight pipe of the nitrogen pressure pipeline is fed into the straight pipe positioning mechanism 3 at the center of the support frame 2 by the matching conveying equipment. The cylinder 305 pushes and pulls the sliding pin 3051 to make the sliding pin 3051 move along the spiral groove 3041 on the surface of the guide shaft 304. The spiral groove 3041 squeezed by the sliding pin 3051 will drive the guide shaft 304 to deflect at an angle. When the sliding pin 3051 drives the guide shaft 304 to rotate forward or backward, the adjusting gears 3042 at both ends of the guide shaft 304 will mesh with the rack 3031 in the forward and reverse directions, thereby driving the turntable 303 to rotate forward or backward. The rotating turntable 303 will squeeze the clamping block 3032 through the inclined groove on its surface, so that the clamping block 3032 moves radially closer or further away along the guide cavity of the guide ring 302. Thus, the clamping blocks 3032 that move closer to each other will perform center positioning clamping on both ends of the straight pipe, and the clamping blocks 3032 that move further away from each other will move away from the outer surface of the straight pipe simultaneously.

[0022] Please see Figures 1-4 and Figure 6The straight pipe positioning mechanism 3 is equipped with a switching mechanism 4 for switching the pipe docking edge for grinding and welding. The switching mechanism 4 includes a lead screw module 401 and a slide block 402 symmetrically installed on the outer side of the gear plate 306. A fixed frame 403 that moves along the lead screw module 401 and the slide block 402 is connected between the lead screw module 401 and the slide block 402. Grinding components 404 and welding components 405 are installed at both ends of the fixed frame 403. The fixed frame 403 that moves back and forth along the lead screw module 401 and the slide block 402 can drive the grinding components 404 and the welding components 405 to alternately approach the pipe.

[0023] In this embodiment, by starting the drive motor of the drive device 201, the drive gear is driven to mesh with the tooth surface of the gear disk 306, which can drive the gear disk 306 to rotate 360° outside the limiting cylinder 301. At this time, the gear disk 306 can drive the switching mechanism 4 to rotate. When it is necessary to clean the oxide layer on the edge of the nitrogen pressure pipeline before welding and to clean the weld slag after the pipeline welding, the screw module 401 drives the fixed frame 403 to move along the slide 402 in the forward direction. This allows the grinding wheel of the grinding component 404 to be placed against the edge of the pipeline and the welding component 405 to be moved away from the pipeline. The rotatable toothed disc 306 is used to drive the grinding wheel to perform annular grinding on the outer periphery of the pipeline edge. The screw module 401 is prior art. For the specific principle, please refer to Chinese Patent No. CN209370426U. Conversely, when welding is required on the edge of the nitrogen pressure pipeline, the screw module 401 drives the fixed frame 403 to move along the slide block 402 in the opposite direction, which can bring the welding component 405 closer to the edge of the pipeline. The grinding wheel of the grinding component 404 will move away from the pipeline. At this time, the rotatable toothed disc 306 is used to drive the welding component 405 to perform circumferential welding on the outer periphery of the pipeline edge.

[0024] Please see Figure 1 , Figure 2 , Figures 7-10 A transfer seat 5 is installed on the side of the base 1 near the support frame 2. The transfer seat 5 has a sliding groove 501 on both sides. The sliding groove 501 is composed of a horizontal channel and a curved channel located at the end of the horizontal channel. Horizontal rails 502 are embedded on both sides of the inner wall of the transfer seat 5. A rotatable circular concave block 503 is magnetically embedded at one end of the horizontal rail 502 near the curved channel. The transfer seat 5 is equipped with a bend support 6 for moving and placing bends along the transfer seat 5. A lever 601 that passes through the middle of the bend support 6 and penetrates the slide groove 501 is installed. A baffle 602 that fits and blocks one end of the bend is installed on one side of the bend support 6. A moving pin 603 that prevents deviation along the horizontal track 502 is fixed on the outer corner of the bend support 6. A U-shaped opening that matches the size of the moving pin 603 is opened in the middle of the circular concave block 503.

[0025] In this embodiment, the movable pin 603 of the bent pipe support 6 is slidably connected to the horizontal track 502, and the lever 601 passing through the middle of the bent pipe support 6 is connected to the slide groove 501. When the movable pin 603 of the bent pipe support 6 slides in the horizontal track 502, the bent pipe support 6 will drive the bent pipe to move horizontally. When the movable pin 603 of the bent pipe support 6 slides from the horizontal track 502 to the U-shaped opening of the circular concave block 503 or slides from the U-shaped opening of the circular concave block 503 to the horizontal track 502, the movable pin 603 can rotate with the rotation of the circular concave block 503 by utilizing the rotatable characteristic of the circular concave block 503 at one end of the horizontal track 502. This allows the bent pipe support 6 to deflect at an angle about the central axis of the circular concave block 503. When deflecting, the bent pipe support 6 will drive the lever 601 to slide in the curved channel of the slide groove 501.

[0026] Please see Figure 1 , Figure 2 , Figures 7-10 and Figure 12 The bend support 6 is provided with a bend positioning mechanism 7 for positioning and clamping bends with intermittently reversed placement angles. The bend positioning mechanism 7 includes an electric push rod 701 movably connected to the outer wall of the bend support 6. The inner side of the bend support 6 is connected to an active clamping roller 703 and a driven clamping roller 705 via a rotating shaft. The contact points between the active clamping roller 703 and the driven clamping roller 705 and the bend are designed with a spherical surface, which can center and clamp the inner bend of the bend. The curved tube support 6 has arc-shaped openings 704 on both sides, and the rotating shaft of the driven clamping roller 705 is inserted into the arc-shaped opening 704. The arc-shaped opening 704 and the rotating shaft of the driving clamping roller 703 are arranged coaxially. The output end of the electric push rod 701 is connected to the rotating shaft of the driving clamping roller 703 through the traction arm 702. Both the driving clamping roller 703 and the driven clamping roller 705 are equipped with meshing transmission gears 706.

[0027] In this embodiment, the bent pipe is placed in the bent pipe support 6, and the lower end of the bent pipe is limited by the baffle 602. Then, the traction arm 702 is pulled by the electric push rod 701, so that the traction arm 702 will drive the active clamping roller 703 to deflect through the rotating shaft. The meshing transmission gear 706 makes the active clamping roller 703 and the driven clamping roller 705 press against the inner bend of the bent pipe, so that the active clamping roller 703 and the driven clamping roller 705 center the bent pipe in the central area of ​​the bent pipe support 6. It should be noted that when the active clamping roller 703 and the driven clamping roller 705 deflect and clamp the inner bend of the bent tube, the position of the driven clamping roller 705 is based on the position of the active clamping roller 703. When the active clamping roller 703 clamps the inner bend of the bent tube and reaches the desired position, the driven clamping roller 705 will immediately stop rotating. When the active clamping roller 703 clamps the inner bend of the bend and the driven clamping roller 705 does not, the active clamping roller 703 and the baffle 602 can be used to position the bend. When the active clamping roller 703 has not yet clamped the inner bend of the bend and the driven clamping roller 705 has completed clamping the inner bend of the bend, the driven clamping roller 705 can initially complete the clamping and restriction of the inner bend of the bend. At this time, when the continuously rotating active clamping roller 703 completes the clamping of the inner bend of the bend, the continuously meshing transmission gear 706 will cause the driven clamping roller 705 to... The rotation axis of roller 705 slides along the arc-shaped opening 704, so that the driven clamping roller 705, which rotates with the active clamping roller 703, avoids excessive contact between the driven clamping roller 705 and the inner bend of the bent tube, which would prevent the bent tube from being properly positioned with the baffle 602 and the active clamping roller 703. This prevents the welding end of the bent tube from shifting and avoids a deviation in the welding angle between the welding end of the bent tube and the welding end of the straight tube, thus enabling the bent tube to be anti-biased clamped in the bent tube support 6. It should also be noted that the meshing transmission gears 706 can drive the active clamping roller 703 and the driven clamping roller 705 to deflect towards each other or away from each other. When the active clamping roller 703 and the driven clamping roller 705 deflect towards each other, the active clamping roller 703 can squeeze one end of the bent tube to stably abut against the baffle 602. Since the driven clamping roller 705 has a avoidance characteristic when abutting against the bent tube, the driven clamping roller 705 will not affect the clamping of the active clamping roller 703 at the inner bend of the bent tube.

[0028] Please see Figure 12 The curved pipe support 6 has notches on both sides near the arc-shaped opening 704. A pressure plate 708 is hinged in the notch to fit and press against the rotating shaft, and a tension spring 707 is connected between one end of the pressure plate 708 and the inner wall of the notch.

[0029] In this embodiment, the tension spring 707 in the notch tightens the pressure plate 708, causing the pressure plate 708 to press against the rotating shaft of the driven clamping roller 705. When the rotating shaft of the driven clamping roller 705 slides along the arc-shaped opening 704 to avoid the bend, the rotating shaft of the driven clamping roller 705 will push the pressure plate 708 to overcome the tension of the tension spring 707. Conversely, the tension spring 707 can use its traction energy to make the pressure plate 708 continuously press against the rotating shaft of the driven clamping roller 705, ensuring that the driven clamping roller 705 can abut against the inner bend of the bend, preventing the bend from loosening and warping on the bend support 6.

[0030] Please see Figure 1 , Figure 2 , Figures 7-8 and Figure 11 The outer side of the transfer seat 5 is provided with a flipping mechanism 8 that drives the bent tube support 6 to move horizontally and rotate 90° within the transfer seat 5. There are two bearing seats connected between the base 1 and the transfer seat 5. The flipping mechanism 8 includes a deflection shaft 802 that passes through the two bearing seats respectively. The deflection shaft 802 located on the two bearing seats is in a coaxial and separate state. The ends of the deflection shaft 802 that are separate from each other are respectively fixed with a fan-shaped plate 805 and a support plate. A flap 801 is sleeved on one end of the deflection shaft 802 near the sector plate 805. The surface of the flap 801 is provided with a sector-shaped opening 804 for the sector plate 805 to deflect. The arc length of the sector opening 804 is greater than the arc length of the sector plate 805. A hydraulic rod 803 is hinged on the base 1 and docked with the flap 801. The surface of the flap 801 is provided with an inner cavity that is slidably docked with the lever 601.

[0031] In this embodiment, the retractable hydraulic rod 803 can drive the flap 801 and the deflection shaft 802 to rotate around the bearing seat. When the bend support 6 sends the bend clamped to the support frame 2 and connects with one end of the straight pipe, the switching mechanism 4 controls the grinding assembly 404 and the welding assembly 405 to alternately grind and weld the pipe connection edge. After the welding of the bend and the straight pipe is completed, the straight pipe positioning mechanism 3 is used to loosen the clamp on the welded straight pipe, and the hydraulic rod 803 pushes the flip plate 801 to flip away from the support frame 2. At this time, the flip plate 801 will squeeze the lever 601 through the inner cavity, so that the lever 601 drives the bend support 6 to move laterally along the horizontal channel and horizontal track 502 of the transfer seat 5. When the bend support 6 moves laterally away from the support frame 2, the bend support 6 will drive the welded nitrogen pressure pipe to disengage from the straight pipe positioning mechanism 3. When the movable pin 603 of the bent pipe support 6 slides into the circular recess 503 at one end of the horizontal track 502, the flip plate 801, which continues to flip, will continue to push the lever 601 through the inner cavity, causing the lever 601 to move along the curved channel. At this time, the movable pin 603 will drive the circular recess 503 to rotate. When the lever 601 moves to the end of the curved channel, the movable pin 603 and the circular recess 503 of the bent pipe support 6 will rotate 90° synchronously, so that the welded bent pipe and straight pipe stand in the bent pipe support 6, which is convenient for personnel to handle. The reciprocating flip plate 801 can intermittently reverse the placement angle of the bent pipe. After the welded pipe is moved away, the new bend is reinserted into the bend support 6, and the bend positioning mechanism 7 is used to position and clamp the bend. The reverse traction hydraulic rod 803 drives the flip plate 801 to reset and flip, so that the inner cavity of the flip plate 801 can be reversely squeezed and slid against the lever 601 of the bending channel. This allows the moving pin 603 and the circular concave block 503 of the bend support 6 to reset and rotate in the reverse direction, so that the end of the bend to be welded is horizontally aligned with the central axis of the straight pipe positioning mechanism 3. At this time, the flip plate 801, which continues to deflect in the reverse direction, will continue to push the bend support 6 to move closer to the support frame 2 area, so that the flipped bend can be sent to the straight pipe clamping area for positioning and docking.

[0032] Please see Figure 2 , Figure 7 , Figure 8 and Figure 11 A push-pull rod 806 is movably connected to the support plate of the deflection shaft 802, and a positioning plate 807 that is pushed, pulled and flipped by the push-pull rod 806 is hinged to one end of the transfer seat 5 near the support frame 2.

[0033] In this embodiment, when the hydraulic rod 803 pushes the flap 801 to deflect, the flap 801 will drive the fan-shaped opening 804 to rotate. Since the arc length of the fan-shaped opening 804 is greater than the arc length of the fan-shaped plate 805, when the fan-shaped opening 804 of the flap 801 deflects to abut against the fan-shaped plate 805, the flap 801 will drive the bent pipe support 6 to move laterally away from the positioning plate 807. The flap 801, which continues to deflect, will drive the support plate of the deflection shaft 802 to press the push-pull rod 806 by squeezing the fan-shaped plate 805. As a result, the push-pull rod 806 will push the hinge. When the hydraulic rod 803 pushes the flip plate 801 to deflect into place, the push-pull rod 806 will push the positioning plate 807 at one end of the transfer seat 5 to flip from horizontal to vertical. At this time, the vertically placed positioning plate 807 will cover one side of the support frame 2. When assembling the straight pipe through the straight pipe positioning mechanism 3, the positioning plate 807 can be used to position and align the horizontally positioned clamped end of the straight pipe to be welded, preventing the straight pipe from shifting horizontally during clamping and from failing to align the grinding component 404 and the welding component 405. Conversely, when the hydraulic rod 803 pulls the flap 801 to deflect in the opposite direction, the flap 801 will drive the fan-shaped opening 804 to rotate until the flap 801 squeezes the fan-shaped plate 805 through the fan-shaped opening 804 to drive the support plate of the deflection shaft 802 to pull the push-pull rod 806. As a result, the push-pull rod 806 will pull the positioning plate 807 from the vertical position to the horizontal position. At this time, the horizontally placed positioning plate 807 will be stored under the bent pipe support 6, which will facilitate its movement to the bent pipe end near the support frame 2 and abut against the straight pipe end.

[0034] Working principle: The straight pipe of the nitrogen pressure pipeline is centered and clamped by the straight pipe positioning mechanism 3 in the support frame 2. During positioning, the positioning plate 807 of the flipping mechanism 8 positions the straight pipe. Then, the bend pipe is placed in the bend pipe support 6 away from the support frame 2 by moving and flipping. The bend pipe is clamped and positioned to prevent deviation by the bend pipe positioning mechanism 7. Then, the bend pipe support 6 is moved along the transfer seat 5 to a position close to the support frame 2 by the flipping mechanism 8. At the same time, the positioning plate 807 that blocks the position of the straight pipe will be folded and stored. This allows the straight pipe and bend pipe, which are positioned in stages, to achieve anti-angle deviation positioning and anti-position deviation positioning before welding when they approach and abut each other. Finally, the grinding component 404 and the welding component 405, which alternately approach the end of the pipe to be welded, can perform high-quality welding processing on the pipe joint edge. The contents not described in detail in this description are existing technologies known to those skilled in the art.

Claims

1. A welding positioning device for a nitrogen pressure pipeline, comprising a base (1), wherein a straight pipe positioning mechanism (3) for centrally clamping a straight pipe is provided above the base (1), characterized in that: The straight pipe positioning mechanism (3) is provided with a switching mechanism (4) for switching the pipe docking edge for grinding and welding. The base (1) is equipped with a transfer seat (5) on the side near the support frame (2). The transfer seat (5) is provided with a bent pipe support (6) for moving and placing the bent pipe along the transfer seat (5). The bend support (6) is provided with a bend positioning mechanism (7) for positioning and clamping bends with intermittently reversed placement angles. The bend positioning mechanism (7) includes an electric push rod (701) movably connected to the outer wall of the bend support (6). The inner side of the bend support (6) is connected to an active clamping roller (703) and a driven clamping roller (705) through a rotating shaft. The active clamping roller (703) and the driven clamping roller (705) are used to deflect and clamp the inner bend of the bend. The outer side of the transfer seat (5) is provided with a flipping mechanism (8) that drives the bent tube support (6) to move horizontally and rotate 90° within the transfer seat (5). There are two bearing seats connected between the base (1) and the transfer seat (5). The flipping mechanism (8) includes a deflection shaft (802) that passes through the two bearing seats respectively. The deflection shaft (802) located on the two bearing seats is in a coaxial and separate state. The ends of the deflection shaft (802) that are separate from each other are respectively fixed with a fan-shaped plate (805) and a support plate. A push-pull rod (806) is movably connected to the support plate of the deflection shaft (802). The end of the transfer seat (5) near the support frame (2) is hinged to a positioning plate (807) that is pushed, pulled and flipped by the push-pull rod (806). The positioning plate (807) is used to position and align the straight pipe to be welded that is horizontally positioned and clamped.

2. The welding positioning device for a nitrogen pressure pipeline according to claim 1, characterized in that: The straight tube positioning mechanism (3) is horizontally supported by a support frame (2) installed on the base (1). A drive device (201) is installed on the side of the support frame (2). The drive device (201) consists of a drive motor and a drive gear located at the output end of the drive motor.

3. The welding positioning device for a nitrogen pressure pipeline according to claim 2, characterized in that: The straight pipe positioning mechanism (3) includes a limiting cylinder (301) installed inside the support frame (2), and guide rings (302) are symmetrically installed at both ends of the limiting cylinder (301). A turntable (303) slides coaxially on the side of the guide ring (302) away from the limiting cylinder (301). A rack (3031) is provided on the inner wall of the turntable (303), and an inclined groove is provided on the surface of the turntable (303). A guide cavity perpendicular to the axis of the guide ring (302) is provided on the surface of the guide ring (302). A clamping block (3032) is inserted into the inclined groove and the guide cavity. A parallel guide shaft (304) and a cylinder (305) are provided between two guide rings (302). An adjusting gear (3042) is fixed through the end of the guide shaft (304) that extends out of the guide ring (302). A spiral groove (3041) is provided on the circumferential side surface of the guide shaft (304). The tail of the cylinder (305) is installed on the surface of one of the guide rings (302). The output end of the cylinder (305) is connected to the spiral groove (3041) through a sliding pin (3051). The outer side of the limiting cylinder (301) is connected by a bearing sleeve to a gear disk (306) that is driven to rotate by the driving device (201).

4. The welding positioning device for a nitrogen pressure pipeline according to claim 3, characterized in that: The switching mechanism (4) includes a lead screw module (401) and a slide block (402) symmetrically installed on the outer side of the gear plate (306). A fixed frame (403) that moves along the lead screw module (401) and the slide block (402) is connected between the lead screw module (401) and the slide block (402). The fixed frame (403) is equipped with a grinding component (404) and a welding component (405) at both ends. The fixed frame (403), which moves back and forth along the screw module (401) and the slide (402), can drive the grinding component (404) and the welding component (405) to alternately approach the pipe.

5. The welding positioning device for a nitrogen pressure pipeline according to claim 1, characterized in that: The transfer seat (5) has grooves (501) on both sides. The grooves (501) are formed by connecting a horizontal channel and a curved channel at the end of the horizontal channel. Horizontal rails (502) are embedded on both sides of the inner wall of the transfer seat (5). A rotatable circular concave block (503) is magnetically embedded at one end of the horizontal rail (502) near the curved channel.

6. The welding positioning device for a nitrogen pressure pipeline according to claim 5, characterized in that: A lever (601) that passes through the groove (501) is transversely through the middle of the bent pipe support (6). A baffle (602) that fits and blocks one end of the bent pipe is installed on one side of the bent pipe support (6). A moving pin (603) that prevents deviation along the horizontal track (502) is fixed on the outer corner of the bent pipe support (6). A U-shaped opening that matches the size of the moving pin (603) is opened in the middle of the circular concave block (503).

7. The welding positioning device for a nitrogen pressure pipeline according to claim 1, characterized in that: The contact points between the active clamping roller (703) and the driven clamping roller (705) and the bend are designed with a spherical surface, which can clamp the inner bend of the bend in a centered manner. The curved tube support (6) has arc-shaped openings (704) on both sides, and the rotating shaft of the driven clamping roller (705) is inserted into the arc-shaped opening (704). The arc-shaped opening (704) and the rotating shaft of the active clamping roller (703) are arranged on the same axis. The output end of the electric actuator (701) is connected to the rotation shaft of the active clamping roller (703) via the traction arm (702). Both the active clamping roller (703) and the driven clamping roller (705) are equipped with meshing transmission gears (706).

8. The welding positioning device for a nitrogen pressure pipeline according to claim 7, characterized in that: The curved pipe support (6) has notches on both sides near the arc-shaped opening (704). A pressure plate (708) is hinged in the notch to fit and press against the rotating shaft. A tension spring (707) is connected between one end of the pressure plate (708) and the inner wall of the notch.

9. The welding positioning device for a nitrogen pressure pipeline according to claim 1, characterized in that: The deflection shaft (802) is fitted with a flap (801) at one end near the sector plate (805). The surface of the flap (801) is provided with a sector-shaped opening (804) for the sector plate (805) to deflect. The arc length of the sector-shaped opening (804) is greater than the arc length of the sector plate (805).

10. A welding positioning device for a nitrogen pressure pipeline according to claim 9, characterized in that: The base (1) is hinged with a hydraulic rod (803) that is connected to the flip plate (801), and the surface of the flip plate (801) has an inner cavity that is slidably connected to the lever (601).

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