Large valve core piece plasma spray welding complete equipment

Abstract

The application relates to the technical field of plasma spray welding equipment, and particularly discloses a complete set of plasma spray welding equipment for large valve core parts, which comprises a fixedly arranged base support structure, a three-shaft L-shaped positioner for bearing and driving a workpiece to realize multi-degree-of-freedom spatial position transformation is arranged on the base support structure, an automatic centering and clamping assembly for clamping valve core parts of different sizes is arranged on the three-shaft L-shaped positioner, a welding execution assembly capable of moving along a straight line is arranged on one side of the base support structure, and a plasma welding gun capable of being adjusted in multiple directions is connected to the welding execution assembly. The application has wide adaptability. Through the lifting, rotating and overturning functions of the three-shaft L-shaped positioner, in cooperation with the automatic centering and clamping assembly capable of being adjusted in the radial direction, various specifications of workpieces from large valve core parts to small valve core parts can be compatible, one machine can be used for multiple purposes, and the equipment investment cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of plasma spraying equipment technology, specifically to a complete set of plasma spraying equipment for large valve core components. Background Technology

[0002] Large valve cores are core components in critical valves used in thermal power generation, nuclear power, and petrochemical industries. Their operating environments are typically high-temperature, high-pressure, and corrosive media, thus requiring extremely high wear resistance, corrosion resistance, and erosion resistance on the valve core surface. Plasma spraying, as an advanced surface modification technology, can fuse alloy powder onto the workpiece surface to form a dense alloy layer, significantly improving the service life of the valve core.

[0003] In the plasma spraying production of large valve core components, the following quality requirements must be met: the weld formation is aesthetically pleasing, the overlap is smooth, and there are no obvious joint marks when changing passes; the weld is subjected to PT flaw detection after machining and must meet the relevant standard inspection requirements; if necessary, process evaluation is required to meet the relevant performance indicators of ASME IX.

[0004] However, existing technologies lack specialized plasma spraying equipment for large valve core components. Traditional equipment suffers from the following problems: First, it has poor adaptability; the size range between large valve cores (with diameters of up to 1 meter and weights of several tons) and small valve cores is extremely large. The clamping and positioning mechanisms of existing equipment cannot accommodate both specifications, often requiring two sets of equipment, which increases equipment investment and production costs.

[0005] Secondly, clamping is difficult; large valve core components usually have a base, are heavy, and are difficult to position accurately after hoisting. Traditional manual clamps are cumbersome to operate and cannot guarantee centering accuracy, affecting the consistency of welding quality.

[0006] Third, insufficient displacement capability; plasma spraying requires the workpiece surface to be welded to always be in the optimal welding posture (usually horizontal or slightly inclined) to facilitate the flow and formation of the molten pool. Traditional positioners have few degrees of freedom and are difficult to achieve multi-angle spatial transformation of large workpieces.

[0007] Fourth, the degree of automation is low; the welding process requires frequent manual intervention to adjust the position and parameters of the welding torch, which is not only inefficient, but also the quality of the weld depends on the skill level of the operator and has poor stability.

[0008] Therefore, developing a complete set of plasma spraying equipment that can accommodate both large and small valve core components and possess multi-degree-of-freedom displacement, automatic centering and clamping, and high-precision welding capabilities is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0009] The purpose of this invention is to provide a complete set of plasma spraying equipment for large valve core components, which aims to solve the technical problems in the prior art such as the inability of the equipment to handle both large and small valve core components, difficulty in clamping and centering, insufficient displacement capability, and low degree of automation.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a complete set of plasma spray welding equipment for large valve core components, comprising a fixedly installed base support structure, a three-axis L-shaped positioner mounted on the base support structure for bearing and driving the workpiece to achieve multi-degree-of-freedom spatial position transformation, an automatic centering and clamping assembly mounted on the three-axis L-shaped positioner for clamping valve core components of different sizes, a welding execution assembly that moves in a straight line mounted on one side of the base support structure, and a plasma welding gun with multi-directional adjustment connected to the welding execution assembly; The three-axis L-shaped positioner is configured to drive the workpiece to rise and fall in the vertical direction, rotate around the vertical axis, and flip around the horizontal axis, so as to adjust the welding posture of the workpiece surface to be welded. The automatic centering clamping assembly is configured to move the clamping elements radially synchronously through a synchronous linkage mechanism to achieve automatic centering and clamping of valve cores of different diameters and to maintain stable clamping force during welding. The welding execution assembly is configured to move along the workpiece axial direction and drive the plasma welding torch to adjust its position in multiple spatial dimensions so that the welding torch is precisely aligned with the weld trajectory. The basic support structure is also equipped with auxiliary support components, which are used to temporarily support and adjust the position of the large valve core before clamping.

[0011] Furthermore, the three-axis L-shaped positioner includes a lifting frame fixed on the foundation, a sliding seat 1 slidably connected to the lifting frame, a lead screw and a lifting servo motor for driving the sliding seat 1 to rise and fall, a rotary support fixed on the sliding seat 1, a rotary servo motor for driving the inner ring of the rotary support to rotate, a transfer box fixedly connected to the inner ring of the rotary support, a cantilever box vertically fixed to the bottom of the transfer box, and a servo turntable rotatably connected to one side of the cantilever box; the servo turntable is driven by an independent servo motor.

[0012] Furthermore, the automatic centering clamping assembly is concentrically fixed on the servo turntable, including a fixing component, guide rails symmetrically distributed on the fixing component, a second sliding seat slidably connected to the guide rail, a hydraulic cylinder connecting the second sliding seat on the same side, a clamping block fixed on the second sliding seat, a clamping jaw fixed to the top of the clamping block, and a synchronous gear ring rotatably connected to the middle of the fixing component; synchronous racks that mesh with the synchronous gear ring are fixed on the second sliding seats on different sides, and the synchronous racks are centrally symmetrically distributed, used to enable the clamping blocks on both sides to move synchronously in center under the drive of the hydraulic cylinder.

[0013] Furthermore, the auxiliary support component is a movable adjustable support wheel, which is set on the foundation and located at the center line of the automatic centering clamping assembly. It is used to temporarily support the bottom of the workpiece during workpiece hoisting and to assist in adjusting the position of the workpiece before clamping.

[0014] Furthermore, the welding assembly includes a sliding base slidably connected to a servo rail, a support column vertically fixed to the sliding base, a sliding plate slidably connected to the support column, a transverse tube fixed to the sliding plate, a Y-extension tube telescopically disposed within the transverse tube, an XZ-aligning mechanism fixed to the end of the Y-extension tube, and a plasma welding torch connected to the XZ-aligning mechanism; the sliding base is driven by a servo motor to move along the servo rail, the sliding plate is driven by a servo motor to rise and fall along the support column, the Y-extension tube is controlled to extend and retract by a drive mechanism, and the XZ-aligning mechanism is a bidirectional adjustment device driven by a servo motor, used to achieve fine-tuning of the welding torch's position in the front-back and up-down directions.

[0015] Furthermore, the servo ground rail is fixed to one side of the foundation, and its extension direction is parallel to the axial direction of the workpiece after it is clamped.

[0016] Furthermore, the equipment also includes a welding control system, which is electrically connected to the drive mechanism of the three-axis L-type positioner, the automatic centering and clamping assembly, and the welding execution assembly. The system is configured to start with one key according to a preset program and automatically complete the welding process of the entire weld seam, while allowing manual intervention to adjust the welding parameters during the welding process.

[0017] Furthermore, the welding control system also includes a temperature detection module for real-time monitoring of the interpass temperature during the welding process and feeding it back to the control system to adjust welding parameters or pause welding to wait for cooling.

[0018] Furthermore, the synchronous gear module of the automatic centering clamping assembly is 8, and the grippers are used to clamp the valve core with a base.

[0019] Furthermore, the lifting servo motor, rotary servo motor, and servo motor driving the servo turntable of the three-axis L-type positioner are all equipped with reducers.

[0020] Compared with the prior art, the beneficial effects of the present invention are: First, it has a wide range of applications; through the lifting, rotation and flipping functions of the three-axis L-type positioner, combined with the radially adjustable automatic centering clamping assembly, it can be compatible with a variety of workpieces from large valve cores to small valve cores, realizing multiple uses of one machine and reducing equipment investment costs. Second, it has high automatic centering accuracy; it adopts a synchronous linkage mechanism driven by hydraulic cylinder and meshing with synchronous rack and synchronous gear ring to ensure that the clamping blocks on both sides move synchronously at the same speed, realize the automatic centering of the workpiece, ensure the coaxiality of the workpiece during rotation welding, and improve the quality of the weld. Third, it offers flexible positioning and excellent accessibility; the three-axis L-type positioner provides three independent motion axes, allowing for arbitrary adjustment of the workpiece's spatial orientation, ensuring the welding surface is always in a horizontal or slightly inclined position most conducive to molten pool formation. Combined with the multi-degree-of-freedom movement of the welding actuator assembly, the welding torch can reach any area of ​​the workpiece to be welded. Fourth, it boasts a high degree of automation; the equipment is equipped with a welding control system that allows for preset welding programs. With a single button start, it automatically completes the welding of the entire seam without human intervention, significantly improving production efficiency. Simultaneously, it allows for timely human intervention, balancing automation and flexibility. Fifth, the auxiliary support design is reasonable; the movable and adjustable support wheel provides temporary support when hoisting large valve core parts, which facilitates the positioning and clamping of the grippers, avoids the workpiece from swaying in the air, and improves the clamping safety. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the connection structure between the three-axis L-shaped positioner and the automatic centering clamping assembly of the present invention; Figure 3 For the present invention Figure 2 The front view; Figure 4 This is a schematic diagram of the mounting structure of the rotary servo motor of the present invention; Figure 5 For the present invention Figure 4 The front view; Figure 6 This is a schematic diagram of the automatic centering and clamping assembly of the present invention; Figure 7 For the present invention Figure 6 Half-section view at point AA along the middle edge; Figure 8 This is a schematic diagram of the internal structure of the automatic centering and clamping assembly of the present invention; Figure 9 For the present invention Figure 8 Top view; Figure 10 This is a schematic diagram of the welding assembly of the present invention.

[0022] In the diagram: 100, Foundation; 200, Three-axis L-shaped positioner; 201, Lifting frame; 202, Sliding seat one; 203, Lead screw; 204, Lifting servo motor; 205, Rotary support; 206, Adapter box; 207, Rotary servo motor; 208, Cantilever box; 209, Servo turntable; 300, Automatic centering clamping assembly; 301, Fixing component; 302, Guide rail; 303, Sliding seat two; 304, Hydraulic cylinder; 305, Clamping block; 306, Gripper; 307, Synchronous rack; 308, Synchronous gear ring; 400, Moving and adjusting support wheel; 500, Servo ground rail; 600, Welding execution assembly; 601, Sliding base; 602, Support column; 603, Sliding plate; 604, Transverse tube; 605, Y-extension tube; 606, XZ steering mechanism; 607, Plasma welding torch. Detailed Implementation

[0023] 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.

[0024] Please see Figures 1 to 10 This invention provides a complete set of equipment for plasma spraying welding of large valve core components.

[0025] I. Basic Structure and Foundation The equipment includes a foundation 100 pre-embedded within the factory building. The foundation 100 is a concrete structure, and its upper surface is leveled to secure the various functional components.

[0026] A three-axis L-shaped positioner 200, a movable adjustment support wheel 400, and a servo ground rail 500 are fixed on the foundation 100.

[0027] Two-axis and three-axis L-type positioners like Figures 1 to 5 As shown, the three-axis L-type positioner 200 includes a lifting frame 201, a sliding seat 202, a lead screw 203, a lifting servo motor 204, a slewing support 205, a transfer box 206, a rotary servo motor 207, a cantilever box 208, and a servo turntable 209.

[0028] The lifting frame 201 is vertically fixed on the foundation 100, and linear guide rails are provided on its left and right sides.

[0029] The sliding seat 202 is slidably connected to the front end of the lifting frame 201 via a slider.

[0030] The lead screw 203 is vertically installed between the top and bottom of the lifting frame 201 and engages with the threaded hole on the back of the sliding seat 202.

[0031] The lifting servo motor 204 is fixed to the top of the lifting frame 201, and its output shaft is connected to the lead screw 203 through a reducer.

[0032] When the lifting servo motor 204 rotates, the lead screw 203 drives the sliding seat 202 to move up and down along the lifting frame 201, realizing the Z-axis lifting motion of the positioner.

[0033] A rotary support 205 is fixed at the center of the front end of the sliding seat 202.

[0034] The outer ring of the slewing support 205 is fixed on the sliding seat 202, and the inner ring is a toothed ring structure that can rotate relative to the outer ring.

[0035] The rotary servo motor 207 is fixed to the side of the sliding seat 202, and its output shaft is connected to a gear, which meshes with the inner ring gear of the rotary support 205.

[0036] When the rotary servo motor 207 rotates, it drives the inner ring to rotate.

[0037] The inner ring is fixedly connected to the adapter box 206, so the adapter box 206 can rotate around the vertical axis to realize the C-axis rotation of the positioner.

[0038] The bottom of the adapter box 206 is vertically fixed with a cantilever box 208, and a servo turntable 209 is rotatably connected to the side of the cantilever box 208 (facing the workpiece).

[0039] The servo turntable 209 is driven by a built-in servo motor and reducer, and can rotate around the horizontal axis (i.e., the direction perpendicular to the cantilever box 208) to realize the B-axis flipping motion of the positioner.

[0040] Through the above three-axis linkage, the workpiece on the servo turntable 209 can be adjusted to any spatial posture.

[0041] III. Automatic centering clamping assembly like Figures 6 to 9 As shown, the automatic centering clamping assembly 300 is concentrically fixed on the servo turntable 209.

[0042] It includes a fixing component 301, a guide rail 302, a sliding seat 303, a hydraulic cylinder 304, a clamping block 305, a gripper 306, a synchronous rack 307, and a synchronous gear ring 308.

[0043] The fastener 301 is a disc-shaped or square base, which is concentrically fixed to the servo turntable 209 by bolts.

[0044] The upper surface of the fastener 301 has four guide rails 302 symmetrically distributed, divided into two groups, left and right, with two rails in each group. Each group of guide rails 302 is slidably connected to two sliding seats 303 (arranged front and back).

[0045] A hydraulic cylinder 304 is connected between two sliding seats 303 on the same side (left or right). The cylinder body and piston rod of the hydraulic cylinder 304 are fixed on the two sliding seats 303 respectively. The distance between the two sliding seats 303 can be changed by extending and retracting the hydraulic cylinder 304.

[0046] A clamping block 305 is fixed between the corresponding sliding seats 303 on the left and right sides that are not on the same guide rail. The cross-section of the clamping block 305 is concave, and a clamping claw 306 is fixed at its top.

[0047] The gripper 306 is used to grip the edge or base of the valve core with a base.

[0048] To ensure that the clamping blocks 305 on the left and right sides can move synchronously and centered, a synchronous gear ring 308 is rotatably connected to the outer side of the middle part of the fixing member 301.

[0049] Synchronous racks 307 that mesh with synchronous gear rings 308 are fixed on the sliding seats 303 on both the left and right sides.

[0050] The left synchronous rack 307 meshes with the left side of the synchronous gear ring 308, and the right synchronous rack 307 meshes with the right side of the synchronous gear ring 308, with the two synchronous racks 307 moving in opposite directions.

[0051] When the hydraulic cylinder 304 drives the sliding seat 303 to move, the synchronous rack 307 drives the synchronous gear ring 308 to rotate, and the synchronous gear ring 308 then drives the synchronous rack 307 on the other side to move in the opposite direction synchronously, so that the clamping blocks 305 on both sides move closer or further away from each other at the same speed, thereby realizing the automatic centering of the workpiece.

[0052] The synchronous gear ring 308 has a module of 8, which gives it high strength and the ability to withstand the clamping force of large valve core components.

[0053] IV. Adjustable Support Wheels like Figure 1 As shown, the movable adjustment support wheel 400 is mounted on the foundation 100 and located below the centerline of the automatic centering clamping assembly 300.

[0054] The movable adjustable support wheel 400 can be a liftable roller platform used to temporarily support the bottom of the workpiece when hoisting large valve core components. Operators can easily push or rotate the workpiece to adjust its position, and then move or lower the support wheel after the gripper 306 clamps it.

[0055] The movable adjustment support wheel 400 can also be designed as a structure that can move along the guide rail to accommodate workpieces of different lengths.

[0056] V. Welding Assembly like Figure 1 and Figure 10 As shown, the servo ground rail 500 is fixed on one side of the foundation 100, and its extension direction is parallel to the axial direction of the workpiece after clamping.

[0057] The welding assembly 600 is slidably connected to the servo ground rail 500.

[0058] The welding assembly 600 includes a sliding base 601, a support column 602, a sliding plate 603, a transverse tube 604, a Y-extension tube 605, an XZ directional adjustment mechanism 606, and a plasma welding torch 607.

[0059] The sliding base 601 is driven by a servo motor and moves along the servo ground rail 500 through a gear and rack mechanism to realize the X-axis (workpiece axis) movement of the welding torch.

[0060] The support column 602 is vertically fixed on the sliding base 601, and a guide rail is provided on its side.

[0061] The sliding plate 603 is driven by a servo motor and slides up and down along the support column 602 through a gear and rack mechanism to realize the Z-axis lifting and lowering of the welding torch.

[0062] The horizontal tube 604 is horizontally fixed on the sliding plate 603 and is hollow inside. The Y-extension tube 605 is telescopically installed inside the horizontal tube 604 and is driven by a motor or cylinder to realize the movement of the welding torch along the Y-axis (the horizontal direction perpendicular to the workpiece axis).

[0063] The end of the Y-extension tube 605 is fixed with an XZ directional adjustment mechanism 606. This directional adjustment mechanism is a bidirectional adjustment device driven by a servo motor, which can realize precise adjustment of the welding torch in the front and back (X-direction fine adjustment) and up and down (Z-direction fine adjustment) directions for tracking the torch and weld.

[0064] The plasma welding torch 607 is connected to the output end of the XZ orienting machine 606.

[0065] VI. Welding Control System The equipment is also equipped with a welding control system (not shown in the figure), which includes an industrial computer, a programmable logic controller, a servo driver, and a human-machine interface. The control system is electrically connected to the drive motors of the lifting servo motor 204, the rotary servo motor 207, the servo turntable 209, the solenoid valve of the hydraulic cylinder 304, the drive motor of the sliding base 601, the drive motor of the sliding plate 603, the drive motor of the Y-extension tube 605, the servo motor of the XZ steering mechanism 606, as well as the plasma welding power supply and powder feeder. The control system is also connected to a temperature detection module (such as an infrared thermometer or thermocouple) for real-time monitoring of the interpass temperature during the welding process.

[0066] VII. Work Process The working process of the device of the present invention is as follows: Step 1: Preheating and hoisting of the workpiece. Preheat the large valve core according to the process requirements (sometimes in a cold state), and then use a crane to hoist it to the top of the equipment. Place the bottom of the valve core on the movable adjustment support wheel 400 and adjust its position so that the center of the valve core is roughly aligned with the center of the servo turntable 209.

[0067] Step Two: Automatic Clamping. The operator initiates the automatic clamping program via a foot switch or control panel. Hydraulic cylinder 304 retracts synchronously, driving the sliding seats 303 on both sides to move closer together. Clamping blocks 305 and jaws 306 move towards the center, while synchronous racks 307 and synchronous gear rings 308 ensure synchronization on both sides. Jaws 306 clamp the base or flange edge of the valve core component. After reaching the set pressure, hydraulic cylinder 304 maintains pressure. The movable adjusting support wheel 400 resets and moves away.

[0068] Step 3: Positioning and Adjustment. Based on the position of the weld to be welded, the control system automatically or manually controls the three-axis L-type positioner 200 to perform the following actions: the lifting servo motor 204 adjusts the height of the workpiece, the rotation servo motor 207 adjusts the angle of the workpiece around the vertical axis, and the servo turntable 209 adjusts the rotation angle of the workpiece around the horizontal axis, so that the surface to be welded is in the optimal welding posture of being horizontal or slightly inclined (facilitating the flow of the molten pool).

[0069] Step 4: The welding torch is aligned and the welding execution assembly 600 moves along the servo ground rail 500 to the vicinity of the starting point. The sliding plate 603 is raised and lowered, the Y extension tube 605 is extended and retracted, and the XZ directional adjustment mechanism 606 is finely adjusted to align the tungsten electrode of the plasma welding torch 607 with the starting point of the weld seam, and the arc length and extension length are adjusted.

[0070] Step 5: One-click start of welding. The operator selects the preset welding program (or enters parameters) on the control panel and clicks "Start". The equipment automatically executes the program: the welding power source initiates the arc, the powder feeder delivers powder, the servo turntable 209 rotates (or lifts and rotates in conjunction), and simultaneously the welding execution assembly 600 moves accordingly, causing the welding torch to move along the weld seam trajectory to complete one or more layers of cladding. During the welding process, the control system monitors the interpass temperature in real time. When the temperature exceeds the set upper limit, welding is automatically paused to wait for cooling; it automatically resumes after the temperature drops to the lower limit.

[0071] Step Six: Weld Inspection and Repair Welding. After welding is completed, operators can visually inspect the weld formation and perform PT (Potential Testing) if necessary. For local defects, repair welding can be performed manually.

[0072] Step 7: Unload the parts, loosen the clamp 306, and use a crane to lift the welded valve core part away from the equipment.

[0073] In practical implementations, the movable adjusting support wheel 400 can be replaced with a fixed V-shaped bracket, which is suitable for long shaft valve cores.

[0074] In practical implementation, the welding control system can be equipped with a laser weld seam tracking sensor to achieve real-time weld seam tracking and further improve welding accuracy.

[0075] In practical implementations, the equipment can be equipped with a protective cover and a dust removal system to improve the operating environment.

Claims

1. A complete set of equipment for plasma spraying welding of large valve core components, comprising a fixedly installed foundation support structure, characterized in that, The basic support structure is equipped with a three-axis L-shaped positioner (200) for bearing and driving the workpiece to achieve multi-degree-of-freedom spatial position transformation. The three-axis L-shaped positioner (200) is equipped with an automatic centering clamping assembly (300) for clamping valve core parts of different sizes. A welding execution assembly (600) that moves in a straight line is provided on one side of the basic support structure. A plasma welding torch (607) with multi-directional adjustment is connected to the welding execution assembly (600). The three-axis L-type positioner (200) is configured to drive the workpiece to rise and fall in the vertical direction, rotate around the vertical axis, and flip around the horizontal axis, so as to adjust the welding posture of the workpiece surface to be welded. The automatic centering clamping assembly (300) is configured to move the clamping element radially synchronously through a synchronous linkage mechanism to achieve automatic centering and clamping of valve cores of different diameters and to maintain stable clamping force during welding. The welding execution assembly (600) is configured to move along the workpiece axial direction and drive the plasma welding torch (607) to adjust its position in multiple spatial dimensions so that the welding torch is precisely aligned with the weld trajectory; The basic support structure is also equipped with auxiliary support components, which are used to temporarily support and adjust the position of the large valve core before clamping.

2. The complete set of equipment for plasma spraying welding of large valve core components according to claim 1, characterized in that, The three-axis L-type positioner (200) includes a lifting frame (201) fixed on the foundation (100), a sliding seat (202) slidably connected to the lifting frame (201), a lead screw (203) driving the sliding seat (202) to lift and lower, a lifting servo motor (204), a slewing support (205) fixed on the sliding seat (202), a rotary servo motor (207) driving the inner ring of the slewing support (205) to rotate, a transfer box (206) fixedly connected to the inner ring of the slewing support (205), a cantilever box (208) vertically fixed to the bottom of the transfer box (206), and a servo turntable (209) rotatably connected to one side of the cantilever box (208); the servo turntable (209) is driven by an independent servo motor.

3. The complete set of equipment for plasma spraying welding of large valve core components according to claim 2, characterized in that, The automatic centering clamping assembly (300) is concentrically fixed on the servo turntable (209), including a fixing member (301), a guide rail (302) symmetrically distributed on the fixing member (301), a sliding seat two (303) slidably connected to the guide rail (302), a hydraulic cylinder (304) connected to the sliding seat two (303) on the same side, a clamping block (305) fixed on the sliding seat two (303), a clamping claw (306) fixed on the top of the clamping block (305), and a synchronous gear ring (308) rotatably connected to the middle of the fixing member (301); a synchronous rack (307) that meshes with the synchronous gear ring (308) is fixed on the sliding seat two (303) on different sides. The synchronous rack (307) is centrally symmetrically distributed and is used to make the clamping blocks (305) on both sides move synchronously under the drive of the hydraulic cylinder (304).

4. The complete set of equipment for plasma spraying welding of large valve core components according to claim 1, characterized in that, The auxiliary support component is a movable adjustable support wheel (400), which is set on the foundation (100) and located at the center line of the automatic centering clamping assembly (300). It is used to temporarily support the bottom of the workpiece during workpiece hoisting and to assist in adjusting the position of the workpiece before clamping.

5. A complete set of equipment for plasma spraying welding of large valve core components according to claim 1, characterized in that, The welding assembly (600) includes a sliding base (601) slidably connected to a servo rail (500), a support column (602) vertically fixed to the sliding base (601), a sliding plate (603) slidably connected to the support column (602), a transverse tube (604) fixed to the sliding plate (603), a Y-extension tube (605) telescopically disposed in the transverse tube (604), an XZ-aligning mechanism (606) fixed to the end of the Y-extension tube (605), and a plasma welding torch (607) connected to the XZ-aligning mechanism (606). The sliding base (601) is driven by a servo motor to move along the servo rail (500), the sliding plate (603) is driven by a servo motor to rise and fall along the support column (602), the Y-extension tube (605) is controlled to extend and retract by a drive mechanism, and the XZ-aligning mechanism (606) is a bidirectional adjustment device driven by a servo motor, used to realize fine adjustment of the position of the welding torch in the front-back and up-down directions.

6. A complete set of equipment for plasma spraying welding of large valve core components according to claim 5, characterized in that, The servo ground rail (500) is fixed on one side of the foundation (100), and its extension direction is parallel to the axial direction of the workpiece after clamping.

7. A complete set of equipment for plasma spraying welding of large valve core components according to claim 1, characterized in that, The equipment also includes a welding control system, which is electrically connected to the drive mechanism of the three-axis L-type positioner (200), the automatic centering clamping assembly (300), and the welding execution assembly (600), and is configured to start with one key according to a preset program, automatically complete the welding process of the entire weld seam, and allow manual intervention to adjust the welding parameters during the welding process.

8. A complete set of equipment for plasma spraying welding of large valve core components according to claim 7, characterized in that, The welding control system also includes a temperature detection module, which monitors the interpass temperature during the welding process in real time and feeds it back to the control system to adjust welding parameters or pause welding to wait for cooling.

9. A complete set of equipment for plasma spraying welding of large valve core components according to claim 3, characterized in that, The automatic centering clamping assembly (300) has a synchronous gear ring (308) with a module of 8, and the gripper (306) is used to clamp the valve core with a base.

10. A complete set of equipment for plasma spraying welding of large valve core components according to claim 1, characterized in that, The lifting servo motor (204), rotary servo motor (207), and servo motor driving the servo turntable (209) of the three-axis L-type positioner (200) are all equipped with reducers.

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