Multi-station clamping tool for laser welding and temperature control method thereof

Abstract

The application discloses a kind of multi-station clamping tool for laser welding and its temperature control method, it is related to clamping tool technical field, including: rack, moving mechanism and drive mechanism, the controller is installed in rack side, the controller is used to control clamping tool, the rack bottom is connected with moving mechanism, the moving mechanism is provided with two, one of which is connected with drive mechanism, during welding process, when steel pipe rotates, weld and roller contact, if weld is too thick, it will make roller move upwards, trigger infrared sensor to detect displacement threshold change, to remind operator to handle in time, ensure welding quality;By the second plug, external high temperature and high pressure gas is injected into steel pipe, the heat conduction effect of gas is used to heat and keep warm welding area, prevent weld from low ambient temperature and rapidly cool down, avoid producing fissure, to effectively improve welding efficiency and quality.

Description

Technical Field

[0001] This invention relates to the field of clamping fixture technology, specifically to a multi-station clamping fixture for laser welding and its temperature control method. Background Technology

[0002] In modern industrial production, laser welding technology is widely used in the welding of various metal components, especially in the welding of steel pipes and other tubular materials, due to its advantages such as high efficiency, precision, and low heat impact. Multi-station clamping fixtures, capable of simultaneously clamping and positioning multiple workpieces, greatly improve welding efficiency and have become indispensable equipment in modern industrial production. Especially in welding steel pipes and other tubular materials, multi-station clamping fixtures enable simultaneous operation of multiple welding stations, significantly improving production efficiency and equipment utilization.

[0003] However, after welding, due to the low ambient temperature, the weld seam of the steel pipe cools too quickly, making it prone to cracking, which in turn affects the overall strength and service life of the steel pipe. However, existing technologies lack effective temperature control measures to address this problem, resulting in the welded steel pipe not receiving adequate insulation.

[0004] Furthermore, existing clamping fixtures have shortcomings in inspecting weld quality. They cannot monitor weld thickness in real time during welding, making it impossible to detect excessively thick welds in a timely manner. Consequently, welding parameters cannot be adjusted promptly, leading to difficulties in guaranteeing weld quality.

[0005] Therefore, there is an urgent need in the existing technology for a multi-station clamping fixture and its temperature control method for laser welding that can simultaneously clamp and position multiple steel pipes, ensure tight fit of the welded ends of the steel pipes, flexibly control the rotation of the steel pipes, realize post-weld heat preservation treatment, and monitor the weld quality in real time, so as to solve the problems existing in the existing technology. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a multi-station clamping fixture for laser welding and its temperature control method, thus solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a multi-station clamping fixture for laser welding and its temperature control method, comprising: a frame, a moving mechanism, and a driving mechanism. A controller is installed on one side of the frame to control the clamping fixture. The bottom of the frame is connected to the moving mechanism, and two moving mechanisms are provided. One moving mechanism is connected to the driving mechanism, and the other moving mechanism is connected to a sealing mechanism. The two moving mechanisms are respectively used to drive the sealing mechanism and the driving mechanism to move linearly in the horizontal direction. A support mechanism is installed on the top of the frame, and a clamping mechanism is provided above the support mechanism. Multiple clamping mechanisms are provided, and the clamping mechanisms are used to cooperate with the support mechanism to clamp and position the welded pipe fittings.

[0008] Preferably, the moving mechanism includes a first motor, and two first motors are provided. The two first motors are respectively installed at both ends of the base by bolts, and threaded rods are fitted on the external parts of the output ends of the first motors. By providing two first motors and installing them at both ends of the base, precise control of the moving mechanism can be achieved, ensuring the synchronous movement of the two moving seats, thereby ensuring the tight fit and stable clamping of the steel pipe welding ends, and improving the stability and reliability of the welding process.

[0009] Preferably, the driving mechanism includes a slide rail, which is mounted on the top of both sides of the base by screws. The slide rail is slidably connected to the first movable seat. The bottom of the first movable seat is threadedly connected to a threaded rod. A second motor is mounted on one side of the first movable seat. A transmission gear is fitted outside the output end of the second motor. The transmission gear is connected to a driven gear via a transmission belt. The driven gear is fitted outside the rotating shaft. The outer wall of one end of the rotating shaft is connected to the inner wall of the driven gear via a spline. One end of the rotating shaft is fitted outside the telescopic end of the first hydraulic cylinder. The first hydraulic cylinder is mounted on one side of the first movable seat. A first plug is fitted at the other end of the rotating shaft. Through the transmission connection of the second motor, transmission gear, transmission belt, and driven gear, the rotating shaft is driven to rotate, thereby driving the first plug to rotate, realizing the flexible rotation of the steel pipe and ensuring welding quality.

[0010] Preferably, the sealing mechanism includes a second movable seat, the bottom of which is threadedly connected to the threaded rod of another movable mechanism. A second hydraulic cylinder is installed on one side of the second movable seat, and a second plug is fitted onto the external end of the telescopic end of the second hydraulic cylinder. This sealing mechanism achieves precise horizontal movement through the threaded connection between the second movable seat and the threaded rod. Combined with the telescopic action of the second hydraulic cylinder, the second plug can accurately seal the end of the steel pipe, ensuring the internal sealing of the steel pipe during welding. This provides a reliable sealing guarantee for the injection of high-temperature and high-pressure gas, thereby effectively preventing the generation of welding cracks and improving welding quality.

[0011] Preferably, the second plug has a hollow internal structure and is equipped with a pressure sensor. One end of the second plug has a groove, and the interior of the second plug is connected to one end of a corrugated metal pipe, which is connected to an external high-temperature, high-pressure gas source. Both the first and second plugs are made of rubber, and both have a contractile structure at one end. The pressure sensor inside the hollow second plug allows for real-time monitoring of the gas pressure inside the steel pipe, ensuring pressure stability during welding. Simultaneously, the groove at the end of the second plug connects to the corrugated metal pipe, which in turn connects to the external high-temperature, high-pressure gas source, achieving heating and insulation of the steel pipe's interior and preventing rapid cooling and cracking of the weld. Furthermore, the rubber material and contractile design of the first and second plugs ensure a better seal and fit with the steel pipe end, improving sealing performance and ensuring welding quality and insulation effect.

[0012] Preferably, the clamping mechanism includes a bracket mounted on one side above the machine frame. A cylinder is mounted on one top end of the bracket, and a connecting block is fitted onto the telescopic end of the cylinder. A telescopic rod is connected to the bottom of the connecting block, and a first spring is fitted onto the telescopic rod. A roller is connected to one bottom end of the telescopic rod, and an infrared sensor is installed between the roller and the connecting block. The infrared sensor is connected to a remote control terminal. This clamping mechanism achieves elastic clamping of the steel pipe by driving the telescopic rod and roller with the cylinder. The roller contacts the surface of the steel pipe, reducing friction and protecting the surface of the steel pipe. The infrared sensor, installed between the roller and the connecting block, is used to monitor the weld thickness change in real time. When the weld is too thick, the roller moves upward, triggering the infrared sensor and transmitting a signal to the remote control terminal, reminding the operator to adjust the welding parameters in time, thereby effectively ensuring the stability and reliability of the welding quality.

[0013] Preferably, the support mechanism includes a limiting rod, one end of which is connected to a second movable seat via a bolt. A support shaft is slidably connected to the outside of the limiting rod. One end of the support shaft has a tapered structure and a positioning block is provided at one end. The positioning block is threadedly connected to a set bolt, and one end of the set bolt is in contact with the surface of the limiting rod. This support mechanism achieves stable support and flexible movement of the support shaft through the connection between the limiting rod and the second movable seat. The cooperation between the positioning block and the set bolt is used to fix the position of the support shaft, ensuring the stability of the support shaft during the welding process.

[0014] Preferably, a sealing groove is provided on one side of the support shaft. The sealing groove has an arc-shaped structure and a sealing strip is embedded on its surface. One end of the sealing groove is rotatably connected to a slide rod. A digital pressure gauge is installed outside the sealing groove, and the detection end of the digital pressure gauge is connected to the inside of the sealing groove. A top rod is provided below the sealing groove. The top rod is horizontally positioned, and both ends of the top rod are slidably connected to a limiting shaft. The bottom of the limiting shaft is connected to the frame, and a return spring is fitted outside the limiting shaft. This design, by providing an arc-shaped sealing groove on one side of the support shaft and embedding a sealing strip on its surface, can effectively enhance the sealing performance between the steel pipe and the sealing groove, preventing the leakage of high-temperature and high-pressure gas. The rotatable connection of one end of the sealing groove to the slide rod allows for flexible adjustment to accommodate steel pipes of different diameters. The installation of the digital pressure gauge allows for real-time monitoring of pressure changes inside the sealing groove. When a crack exists in the weld, the internal high-pressure gas will enter the sealing groove, causing the digital pressure gauge to detect a change in value, thereby quickly determining that the weld is not fully welded. The sliding connection between the push rod and the limit shaft, along with the reset spring, allows the push rod to push the sealing groove into close contact with the steel pipe surface when needed.

[0015] Preferably, the steps are as follows:

[0016] Preheating stage: Before welding begins, high-temperature and high-pressure gas is injected into the steel pipe through an external high-temperature and high-pressure gas source to raise the internal temperature of the steel pipe to a preset initial temperature range. The initial temperature range is determined based on the thermal expansion coefficient of the welding material and the welding process requirements.

[0017] When injecting gas, strictly control the gas temperature and injection time to ensure that the internal temperature of the steel pipe rises evenly, while avoiding excessive pressure due to excessive gas injection.

[0018] Welding stage: During laser welding, high-temperature and high-pressure gas is intermittently injected into the steel pipe according to the welding process requirements. The welding area is kept warm by the heat conduction of the gas to prevent the weld from cooling down rapidly.

[0019] Each time gas is injected, the temperature and injection volume of the gas are precisely controlled to ensure that the temperature of the welding area is maintained within the preset welding temperature range, while the pressure inside the steel pipe is monitored in real time by a pressure sensor.

[0020] When the pressure sensor detects that the pressure inside the pipe is close to the preset upper limit of the safe pressure, the gas injection is stopped, and the temperature sensor monitors the temperature change in the welding area to ensure that the temperature is maintained within the welding temperature range.

[0021] Cooling stage: After welding is completed, the internal temperature of the steel pipe is gradually reduced by natural heat dissipation;

[0022] During the cooling process, the temperature change inside the steel pipe is monitored in real time by a temperature sensor to ensure that the temperature drops slowly to the ambient temperature, so as to avoid cracks in the weld due to rapid cooling.

[0023] If it is necessary to accelerate the cooling process, external cooling devices can be used to assist in heat dissipation, but it must be ensured that the cooling rate meets the cooling characteristics requirements of the welding material.

[0024] This invention provides a multi-station clamping fixture for laser welding and its temperature control method. It has the following beneficial effects:

[0025] This invention discloses a multi-station clamping fixture for laser welding and its temperature control method. In use, multiple sections of steel pipe to be welded are first placed on a support mechanism, ensuring alignment of the welding ends. Then, a controller starts a first motor, driving a threaded rod to rotate, which in turn moves a first moving seat and a second moving seat relative to each other horizontally. Under the coordinated action of a first hydraulic cylinder and a second hydraulic cylinder, a first plug and a second plug seal both ends of the steel pipe, ensuring a tight fit between the welding ends. The clamping mechanism's cylinder extends downwards, pushing a first spring, which, through a telescopic rod, drives a roller to elastically clamp the surface of the steel pipe. By setting multiple clamping stations, the welding of multiple steel pipe sections can be achieved. Simultaneously, the system is fixed to ensure the stability of the laser welding process. During welding, the second motor drives the rotating shaft to rotate, which in turn drives the first plug and the entire steel pipe to rotate, enabling the welding equipment to fully weld the steel pipe joint. When the steel pipe rotates, the weld seam contacts the roller. If the weld seam is too thick, it will cause the roller to move upward, triggering the infrared sensor to detect the change in the displacement threshold, thereby reminding the operator to handle it in time and ensuring welding quality. At the same time, high-temperature and high-pressure gas from the outside is injected into the steel pipe through the second plug. The heat conduction of the gas is used to heat and keep the welding area warm, preventing the weld seam from cooling rapidly due to the low ambient temperature and avoiding cracks, thereby effectively improving welding efficiency and quality. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 For the present invention Figure 1 Enlarged structural diagram at point B;

[0028] Figure 3 This is a schematic diagram of the support mechanism structure of the present invention;

[0029] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0030] Figure 5 This is a top view of the structure of the present invention;

[0031] Figure 6 This is a front view structural diagram of the present invention;

[0032] Figure 7 This is a schematic diagram of the rear view structure of the present invention;

[0033] Figure 8 This is a schematic diagram of the drive mechanism structure of the present invention.

[0034] In the diagram, 1. Frame; 2. Controller; 3. Moving mechanism; 301. First motor; 302. Threaded rod; 303. Base; 4. Drive mechanism; 401. Slide rail; 402. First moving seat; 403. Second motor; 404. Transmission gear; 405. Transmission belt; 406. Driven gear; 407. First hydraulic cylinder; 408. First plug; 409. Rotating shaft; 5. Sealing mechanism; 501. Second moving seat; 502. Second hydraulic cylinder; 503. Second plug; 50 4. Metal bellows; 6. Clamping mechanism; 601. Bracket; 602. Cylinder; 603. Connecting block; 604. First spring; 605. Telescopic rod; 606. Infrared sensor; 607. Roller; 7. Support mechanism; 701. Limiting rod; 702. Support shaft; 703. Positioning block; 704. Set bolt; 705. Sealing strip; 706. Sealing groove; 707. Slide rod; 708. Digital pressure gauge; 709. Top rod; 710. Limiting shaft; 711. Return spring. Detailed Implementation

[0035] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1: Please refer to Figure 1-8 This invention provides a technical solution: a multi-station clamping fixture for laser welding, comprising: a frame 1, a moving mechanism 3, and a driving mechanism 4. A controller 2 is installed on one side of the frame 1, which is used to control the clamping fixture. The bottom of the frame 1 is connected to the moving mechanism 3. There are two moving mechanisms 3, one of which is connected to the driving mechanism 4, and the other is connected to the sealing mechanism 5. The two moving mechanisms 3 are used to drive the sealing mechanism 5 and the driving mechanism 4 to move linearly in the horizontal direction, respectively. A support mechanism 7 is installed on the top of the frame 1, and a clamping mechanism 6 is provided above the support mechanism 7. Multiple clamping mechanisms 6 are provided, which are used to cooperate with the support mechanism 7 to clamp and position the welded pipe.

[0037] The multi-station clamping fixture and its temperature control method for laser welding in this embodiment, through the coordinated operation of the frame 1, moving mechanism 3, driving mechanism 4, sealing mechanism 5, supporting mechanism 7 and clamping mechanism 6, can achieve stable clamping and positioning of multiple steel pipe sections. The horizontal linear movement function of the moving mechanism 3, in conjunction with the driving mechanism 4 and sealing mechanism 5, ensures that the welded ends of the steel pipes are tightly fitted, while also enabling flexible rotation during the welding process. This effectively solves the problem of cracks easily caused by excessive cooling of the weld seam in the prior art. By injecting high-temperature and high-pressure gas into the interior of the steel pipe for heating and heat preservation, the situation where the weld seam cools too quickly due to low ambient temperature, thus affecting the welding quality, is avoided.

[0038] Example 2: Please refer to Figure 1-8 This invention provides a technical solution: a multi-station clamping fixture for laser welding. The moving mechanism 3 includes two first motors 301, each bolted to both ends of a base 303. Each first motor 301 has a threaded rod 302 mounted on its output end. The driving mechanism 4 includes a slide rail 401, screwed to the top of both sides of the base 303. The slide rail 401 is slidably connected to a first moving seat 402, the bottom of which is threaded to the threaded rod 302. A second motor 403 is mounted on one side of the first moving seat 402. A transmission gear 404 is mounted on the output end of the second motor 403, and is connected to a driven gear 406 via a transmission belt 405. The driven gear 406 is mounted on a rotating shaft. Externally, one end of the rotating shaft 409 is connected to the inner wall of the driven gear 406 via a spline. One end of the rotating shaft 409 is fitted onto the outside of the telescopic end of the first hydraulic cylinder 407. The first hydraulic cylinder 407 is installed on one side of the first movable seat 402. The other end of the rotating shaft 409 is fitted with a first plug 408. The clamping mechanism 6 includes a bracket 601, which is installed on one side above the frame 1. A cylinder 602 is installed at one top end of the bracket 601. A connecting block 603 is fitted onto the outside of the telescopic end of the cylinder 602. A telescopic rod 605 is connected to the bottom of the connecting block 603. A first spring 604 is fitted onto the outside of the telescopic rod 605. A roller 607 is connected to the bottom end of the telescopic rod 605. An infrared sensor 606 is provided between the roller 607 and the connecting block 603. The infrared sensor 606 is connected to the remote control terminal signal.

[0039] In this embodiment, when the device is in use, multiple steel pipes are placed on the support mechanism 7. The first motor 301 drives the threaded rod 302 to rotate. Simultaneously, the rotation of the threaded rod 302 causes the first movable seat 402 and the second movable seat 501 to move relative to each other. Under the extension of the first hydraulic cylinder 407 and the second hydraulic cylinder 502, the first plug 408 and the second plug 503 can seal the ends of the steel pipes, ensuring a tight fit between the welded ends of each steel pipe. Then, the cylinder 602 of the clamping mechanism 6 extends downward, pushing the first spring 604 downward. The first spring 604 then pushes the roller 607 to elastically clamp the surface of the steel pipes. By setting multiple clamping stations, multiple steel pipes can be fixed, thus maintaining the laser... The stability of the welding is ensured by the second motor 403 driving the rotating shaft 409 to rotate, which in turn drives the first plug 408 to rotate, and in turn drives the steel pipe to rotate, thus enabling full welding at the joint of the steel pipe. As the steel pipe rotates, the weld seam on the surface will come into contact with the roller 607. When the weld seam is too thick, the roller 607 will move upward, and the infrared sensor 606 will detect that the displacement threshold is too high, thus reminding the operator that the weld seam is too thick, so as to deal with it in time and ensure the quality of the laser welding machine. During the welding process, external high temperature and high pressure gas is injected into the inside of the steel pipe through the second plug 503, so that the inside of the steel pipe can be heated by the high temperature and high pressure gas, so that the welded steel pipe can be heated and kept warm, avoiding the steel pipe weld seam from cooling too quickly and cracking due to the low temperature of the working environment.

[0040] Example 3: Please refer to Figure 1-8This invention provides a technical solution: a multi-station clamping fixture for laser welding. The sealing mechanism 5 includes a second movable seat 501, the bottom of which is threadedly connected to a threaded rod 302 of another movable mechanism 3. A second hydraulic cylinder 502 is mounted on one side of the second movable seat 501, and a second plug 503 is fitted onto the telescopic end of the second hydraulic cylinder 502. The second plug 503 has a hollow internal structure and a pressure sensor is installed inside. A slot is provided at one end of the second plug 503, and the interior of the second plug 503 is connected to one end of a metal bellows 504, which is connected to an external high-temperature, high-pressure gas source. The surfaces of both the first plug 408 and the second plug 503 are made of rubber, and one end of both the first plug 408 and the second plug 503 has a contracting structure. The support mechanism 7 includes a limiting rod 701, one end of which is bolted to the second... The movable base 501 is connected to the limit rod 701, which is slidably connected to the support shaft 702. One end of the support shaft 702 is tapered, and a positioning block 703 is provided at one end of the support shaft 702. The positioning block 703 is threadedly connected to the set bolt 704, and one end of the set bolt 704 is in contact with the surface of the limit rod 701. A sealing groove 706 is provided on one side of the support shaft 702. The sealing groove 706 is arc-shaped, and a sealing strip 705 is embedded on the surface of the sealing groove 706. One end of the sealing groove 706 is rotatably connected to the slide rod 707. A digital pressure gauge 708 is installed outside the sealing groove 706. The detection end of the digital pressure gauge 708 is connected to the inside of the sealing groove 706. A top rod 709 is provided below the sealing groove 706. The top rod 709 is horizontally positioned, and both ends of the top rod 709 are slidably connected to the limit shaft 710. The bottom of the limit shaft 710 is connected to the frame 1, and a return spring 711 is fitted on the outside of the limit shaft 710.

[0041] In this embodiment, during welding, the second movable seat 501 returns to its original position, causing the second hydraulic cylinder 502 to extend and maintain contact with the steel pipe. As the second movable seat 501 returns to its original position, it drives the limiting rod 701 to move. Simultaneously, the limiting rod 701 moves, causing the support shaft 702 to move. This causes the tapered outer wall of one end of the support shaft 702 to rotate the sealing groove 706, separating the sealing groove 706 from the sealing strip 705 and the surface of the steel pipe. When high-temperature, high-pressure gas is injected into the steel pipe, the second movable seat 501 moves towards the steel pipe, and the second hydraulic cylinder 502 retracts synchronously. This allows the limiting rod 701 to move the support shaft 702, causing one end of the support shaft 702 to disengage from the sealing groove 706. Then, under the thrust of the return spring 711, the push rod 709 is pushed upward. The push rod 709 can push the sealing groove 706 into contact with the surface of the steel pipe, so that the weld is located inside the sealing groove 706. When there is a crack in the weld, the high-pressure gas inside will enter the sealing groove 706, which will allow the digital pressure gauge 708 to detect the change in value, thus quickly determining that the weld is not fully welded, which helps to ensure the welding quality.

[0042] The overall workflow of the multi-station clamping fixture and its temperature control method for laser welding of the present invention is as follows: Before starting work, the multiple steel pipes to be welded are placed on the support mechanism 7 to ensure that the welding ends of the steel pipes are aligned. Then, the controller 2 starts the first motor 301, which drives the threaded rod 302 to rotate, causing the first moving seat 402 and the second moving seat 501 to move relative to each other. The first hydraulic cylinder 407 and the second hydraulic cylinder 502 respectively push the first plug 408 and the second plug 503 to seal both ends of the steel pipe. At the same time, the cylinder 602 of the clamping mechanism 6 extends downward, pushing the first spring 604 and the roller 607 to elastically clamp the surface of the steel pipe, ensuring that the steel pipe remains stable during the welding process. Next, the second motor 403 is started, which drives the rotating shaft 409 to rotate through the transmission gear 404 and the driven gear 406, driving the first plug 408 and the steel pipe to rotate, so that the welding equipment can fully weld the joint of the steel pipe. During welding, the weld seam contacts the roller 607 as the steel pipe rotates. When the weld seam becomes too thick, the roller 607 moves upward, and the infrared sensor 606 detects the change in the displacement threshold, alerting the operator to adjust the welding parameters. Simultaneously, high-temperature, high-pressure gas is injected into the steel pipe through the second plug 503. The gas's thermal conduction is used to insulate the welding area and prevent rapid cooling of the weld seam. After welding, the injection of high-temperature, high-pressure gas continues for a period to maintain a certain temperature inside the steel pipe, preventing cracks from forming in the weld seam due to rapid cooling. Then, gas injection is stopped, and the internal temperature of the steel pipe gradually decreases to ambient temperature through natural heat dissipation or auxiliary cooling devices, completing the entire welding and temperature control process.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-station clamping fixture for laser welding, characterized in that, include: The frame (1), the moving mechanism (3), and the driving mechanism (4) are provided. A controller (2) is installed on one side of the frame (1). The controller (2) is used to control the clamping fixture. The bottom of the frame (1) is connected to the moving mechanism (3). There are two moving mechanisms (3). One moving mechanism (3) is connected to the driving mechanism (4), and the other moving mechanism (3) is connected to the sealing mechanism (5). The two moving mechanisms (3) are used to drive the sealing mechanism (5) and the driving mechanism (4) to move linearly in the horizontal direction, respectively. A support mechanism (7) is installed on the top of the frame (1). A clamping mechanism (6) is provided above the support mechanism (7). There are multiple clamping mechanisms (6). The clamping mechanism (6) is used to cooperate with the support mechanism (7) to clamp and position the welded pipe fitting. The drive mechanism (4) includes a slide rail (401), which is mounted on the top of both sides of the base (303) by screws. The slide rail (401) is slidably connected to the first movable seat (402). The bottom of the first movable seat (402) is threadedly connected to the threaded rod (302). A second motor (403) is mounted on one side of the first movable seat (402). A transmission gear (404) is fitted on the outside of the output end of the second motor (403). 4) The driven gear (406) is connected to the driven gear (406) via a transmission belt (405). The driven gear (406) is fitted on the outside of the rotating shaft (409). The outer wall of one end of the rotating shaft (409) is connected to the inner wall of the driven gear (406) via a spline. One end of the rotating shaft (409) is fitted on the outside of the telescopic end of the first hydraulic cylinder (407). The first hydraulic cylinder (407) is installed on one side of the first movable seat (402). The other end of the rotating shaft (409) is fitted with a first plug (408). The sealing mechanism (5) includes a second movable seat (501), the bottom of which is threadedly connected to the threaded rod (302) of another movable mechanism (3), and a second hydraulic cylinder (502) is installed on one side of the second movable seat (501). A second plug (503) is fitted on the outside of the telescopic end of the second hydraulic cylinder (502). The second plug (503) has a hollow internal structure and a pressure sensor is installed inside the second plug (503). A slot is provided at one end of the second plug (503). The interior of the second plug (503) is connected to one end of a metal bellows (504). The metal bellows (504) is connected to an external high-temperature and high-pressure gas source. The surfaces of the first plug (408) and the second plug (503) are both made of rubber, and one end of both the first plug (408) and the second plug (503) has a contracted structure. The clamping mechanism (6) includes a bracket (601), which is installed on one side above the frame (1). A cylinder (602) is installed at one top end of the bracket (601). A connecting block (603) is fitted on the outside of the telescopic end of the bottom of the cylinder (602). A telescopic rod (605) is connected to the bottom of the connecting block (603). A first spring (604) is fitted on the outside of the telescopic rod (605). A roller (607) is connected to one bottom end of the telescopic rod (605). An infrared sensor (606) is provided between the roller (607) and the connecting block (603). The infrared sensor (606) is connected to the remote control terminal signal. The support mechanism (7) includes a limiting rod (701), one end of which is connected to the second movable seat (501) by a bolt. A support shaft (702) is slidably connected to the outside of the limiting rod (701). One end of the support shaft (702) has a tapered structure. A positioning block (703) is provided at one end of the support shaft (702). The positioning block (703) is threadedly connected to a set bolt (704). One end of the set bolt (704) is in contact with the surface of the limiting rod (701). A sealing groove (706) is provided on one side of the support shaft (702). The sealing groove (706) has an arc-shaped structure and a sealing strip (705) is embedded on the surface of the sealing groove (706). One end of the sealing groove (706) is rotatably connected to the slide rod (707). A digital pressure gauge (708) is installed outside the sealing groove (706). The detection end of the digital pressure gauge (708) is connected to the inside of the sealing groove (706). A top rod (709) is provided below the sealing groove (706). The top rod (709) is horizontally arranged. Both ends of the top rod (709) are slidably connected to the limiting shaft (710). The bottom of the limiting shaft (710) is connected to the frame (1), and a return spring (711) is fitted on the outside of the limiting shaft (710).

2. The multi-station clamping fixture for laser welding according to claim 1, characterized in that: The moving mechanism (3) includes a first motor (301), and there are two first motors (301). The two first motors (301) are respectively installed on both ends of the base (303) by bolts. The output end of each first motor (301) is fitted with a threaded rod (302).

3. The temperature control method for a multi-station clamping fixture for laser welding according to claim 1, characterized in that, The steps are as follows: Preheating stage: Before welding begins, high-temperature and high-pressure gas is injected into the steel pipe through an external high-temperature and high-pressure gas source to raise the internal temperature of the steel pipe to the preset initial temperature range. Welding stage: During laser welding, the welding area is kept warm by the heat conduction of the gas to prevent the weld from cooling down rapidly; Cooling stage: After welding is completed, stop injecting high-temperature and high-pressure gas and allow the internal temperature of the steel pipe to gradually decrease through natural heat dissipation; ensure that the temperature slowly decreases to the ambient temperature to avoid cracks in the weld due to rapid cooling.

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