Large plug valve welding deflection tool

Abstract

The invention provides a large plug valve welding deflection tool which comprises a fixed base plate, an angle positioning mechanism is arranged on the fixed base plate and comprises a mounting plate rotationally arranged on the fixed base plate, a to-be-welded part is detachably arranged on the mounting plate, a supporting part is arranged on the lower portion of the mounting plate, and a positioning mechanism is arranged on the lower portion of the supporting part. The supporting piece can be used for supporting and fixing the position of the mounting plate with the to-be-welded piece after the position of the mounting plate is adjusted, and the to-be-welded piece can be firmly and stably supported and fixed through the supporting piece after the inclination angle of the large to-be-welded piece on the mounting plate is adjusted by means of crane type lifting equipment; and stable and efficient welding operation is achieved in a matched mode, the unnecessary maintenance cost is greatly saved, and the stable safety performance of the welding operation is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve welding auxiliary equipment, in particular to a large plug valve welding displacement tool. BACKGROUND

[0002] The plug valve is a valve that uses a plug with a through hole to realize the opening and closing function. When the plug valve is used, the valve rod is driven to rotate by rotating the speed reducer, and the plug is rotated synchronously to realize the opening or closing action of the valve. Because the sealing surfaces of the plug valve are tightly sealed, the welding quality of the sealing surfaces directly affects the sealing performance and service life of the valve during the production and manufacturing process of the large plug valve.

[0003] At present, there are many problems in the welding operation of large plug valves, especially for large size specifications such as 42 inches to 54 inches.

[0004] The reason is that the traditional welding displacement equipment is mostly general, which is difficult to accurately adapt to the structural characteristics of the large plug valve and cannot meet the specific angle welding requirements. For example, although some existing displacement tools can realize multi-angle adjustment, the adjustment range is too large and not accurate, and when welding the sealing surface of the large plug valve, it is difficult to effectively avoid the flow of welding liquid, which affects the welding quality.

[0005] At the same time, although the displacement equipment with driving can realize the adjustment of the welding angle, it has high energy consumption, and uses a complex hinge structure to cooperate with the driving structure to realize displacement, which not only increases the complexity and failure rate of the equipment, but also causes the overall stability to decrease due to the increase in structure weight.

[0006] In the prior art and authorized patents, such as the patent with the authorization announcement number CN201720909097.7, although multi-directional rotation can be realized, it relies on a servo motor and a speed reducer, which has a complex structure and high cost. For some welding displacement tools for small workpieces or workpieces with specific shapes, the structure and working method cannot be directly applied to the welding scene of the large plug valve, and cannot meet the requirements of the large plug valve for welding position precision, stability and energy saving safety. Therefore, it is of great practical significance to develop a welding displacement tool that is specially used for welding the sealing surface of the large plug valve and can realize precise displacement, energy saving and safety. SUMMARY

[0007] Therefore, the present application provides a large plug valve welding displacement tool, which can realize stable, safe and efficient welding operation of large workpieces at a specific angle through the cooperation of the angle positioning mechanism and the crane lifting equipment, which is more energy-saving and stable, and saves maintenance costs.

[0008] In order to solve the above technical problems, the present invention provides a large plug valve welding position change tool, including a fixed base plate, an angle positioning mechanism is provided on the fixed base plate, the angle positioning mechanism includes a mounting plate rotatably set on the fixed base plate, the workpiece to be welded is detachably set on the mounting plate, and a support member is provided at the lower part of the mounting plate. The support member can support and fix the position of the mounting plate with the workpiece to be welded that has been adjusted. The present invention can adjust the inclination angle of the large workpiece to be welded on the mounting plate with the help of a crane-type lifting equipment, and then use the support member to achieve a firm and stable support and fixation operation of the workpiece to be welded, thereby realizing stable and efficient welding operations, greatly saving unnecessary maintenance costs, and improving the stability and safety performance of the welding operation.

[0009] One of the support members can adjust the angle between the surface to be welded of the workpiece to be welded and the horizontal plane to 31°±10°, and the other support member can adjust the angle between the surface to be welded of the workpiece to be welded and the horizontal plane to -31°±10°. The present invention can design the size of the support member according to the distance between the mounting plate and the fixed base plate, so that when the support member is fixed on the fixed base plate after polishing, one of the hypotenuses of the right triangle formed by the fixed base plate, the mounting plate, and the mounting plate and the fixed base plate, that is, the angle between the mounting plate and the fixed base plate is ±31 degrees. At this time, welding the sealing surface of the large plug valve at this angle can avoid the flow of welding liquid and ensure the welding quality.

[0010] There are at least two support members, which are divided into two groups and are located at both ends of the lower part of the mounting plate. The present invention can use two groups of support members to firmly limit and support the position of the fixed angle after the mounting plate is tilted, greatly improving the stability of the welding angle.

[0011] The support member includes a connecting plate welded to the lower part of the mounting plate, and a support plate is welded to the lower part of the connecting plate. The present invention can achieve a firm connection between the support plate and the mounting plate through the connecting plate, greatly improving the stability of the support operation of the support member.

[0012] The support plate is L-shaped, and the outermost corners are arc angles, which can prevent the support plate from colliding or interfering with the fixed base plate during the rotation of the mounting plate.

[0013] A hinge seat is provided on the fixed base plate, and a hinge plate matching the hinge seat is provided at the lower part of the mounting plate. The hinge seat and the hinge plate are hinged together by a hinge shaft. The present invention can realize the hinge fixation between the mounting plate and the fixed base plate through the hinge seat, the hinge plate and the hinge shaft, which not only can realize the rotation of the mounting plate around the hinge shaft under the action of external force, but also can realize the detachable connection between the fixed base plate and the mounting plate, which is more convenient to operate.

[0014] The position changing tooling also includes self-locking mechanisms provided on both sides of the lower ends of the mounting plate, and the self-locking mechanisms can fix and lock the position of the workpiece to be welded after the position is adjusted.

[0015] The self-locking mechanism includes a first limit seat respectively arranged at both ends of the lower part of the mounting plate and a second limit seat arranged on the fixed base plate and on the left and right sides of the hinge seat, wherein the first limit seat is located on the inner side of the connecting plate, and a limit member is arranged between the first hinge seat and the second limit seat. The present invention can lock and fix the position of the mounting plate and the workpiece to be welded thereon by inserting the limit member between the first limit seat and the second limit seat with adjusted position angles, thereby greatly improving the stability performance of the welding operation.

[0016] A first limiting hole is provided on the first limiting seat, and a second limiting hole is provided on the second limiting seat. The limiting member is a U-shaped rod structure, and its diameter is adapted to the diameters of the first limiting hole and the second limiting hole. The present invention can insert the two vertical rods of the limiting member into the first limiting hole or the second limiting hole on the same side as it, thereby realizing the locking and fixing operation of the position of the fixed base plate and the mounting plate that have been adjusted, thereby greatly improving the stability performance of the welding operation.

[0017] In summary, compared with the prior art, this application has at least one of the following beneficial technical effects:

[0018] 1. Precise Angle Positioning: By providing specially shaped support members, the present invention can precisely adjust the weld surface of a large plug valve to two key angles: 31°±10° and -31°±10°. These two angles have been proven in practice to effectively prevent weld fluid flow and ensure weld quality. Compared with traditional universal positioner fixtures, the welding defect rate is reduced by 40%. For example, when welding large plug valves using universal fixtures in the past, weld fluid flow often resulted in defects such as uneven welds and pores due to the inability to precisely control the angle. However, the use of the present fixture significantly alleviates these problems.

[0019] 2. Simple and Stable Structure: The present invention utilizes a simple hinged structure to achieve rotation of the mounting plate, avoiding the high failure rate and stability issues associated with complex hinges. Furthermore, the fixture's overall structural design is rational, and its components are made of high-quality materials, enabling stable support for large plug valves. During welding, the fixture exhibits less than 5mm of vibration, ensuring stability and improving welding precision. For example, during actual welding operations, the fixture remains stable even during extended periods, preventing structural issues from impacting welding quality.

[0020] 3. Energy-saving and high-efficiency: The positioning process in this invention is achieved by lifting and lowering the crane, eliminating the need for a built-in drive device for the tooling, significantly reducing energy consumption. In large-scale production, energy consumption can be reduced by over 60% compared to self-driven positioning equipment. For example, over a one-month production cycle, electricity costs for traditional self-driven positioning equipment are 10,000 yuan, while using the tooling of this invention only costs around 4,000 yuan, significantly reducing production costs.

[0021] 4. Easy to operate: The present invention uses a crane to perform position shifting operations to achieve precise adjustment of the welding fixed position. There is no need for the operator to repeatedly measure and adjust the angle. The operator only needs to control the lifting and lowering of the crane and cooperate with simple limiter insertion and extraction actions to complete the angle adjustment and fixation of the large plug valve. The operation process is simple and easy to understand, which reduces the operator's skill requirements and labor intensity. New operators can skillfully operate the tooling of the present invention to perform large plug valve welding operations after simple training. The requirements for operators are greatly reduced, and the welding efficiency is improved to a certain extent.

[0022] 5. Wide Range of Applications: The detachable mounting plate of the present invention can be adapted to various sizes of large plug valves ranging from 42 inches to 54 inches. Stable installation and welding operations can be achieved by simply adjusting the bolt mounting position and selecting appropriate connecting accessories according to the size of the plug valve. This highly versatile design reduces the cost of replacing tooling due to changes in product specifications. For example, when producing large plug valves in both 42-inch and 54-inch sizes, a company no longer needs to purchase separate tooling; the tooling of the present invention can meet the welding requirements of both sizes.

[0023] 6. Improved production efficiency: The positioner fixture of the present invention enables precise angle positioning and a convenient operating process, allowing welding operations to be carried out quickly and orderly. Compared with traditional welding methods, production efficiency is increased by more than 50%. Based on an 8-hour working day, the traditional method can weld 10 large plug valves per day, while the fixture of the present invention can weld more than 15 per day, effectively improving the company's production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of the welding position adjustment tool for a large plug valve according to the present invention at 31°;

[0025] Figure 2 This is a structural schematic diagram of the welding position adjustment tool for a large plug valve of the present invention at -31°.

[0026] Explanation of the accompanying drawings: 100, fixed base plate; 200, angle positioning mechanism; 210, mounting plate; 220, support member; 221, connecting plate; 222, support plate; 230, hinge seat; 240, hinge plate; 300, self-locking mechanism; 310, first limit seat; 311, first limit hole; 320, second limit seat; 321, second limit hole; 330, limit member. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1-2 , clearly and completely describing the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments derived by ordinary technicians in this field fall within the scope of protection of the present invention.

[0028] like Figure 1-2 As shown: This embodiment provides a large plug valve welding displacement tooling, including a fixed base plate 100. The fixed base plate 100 is made of Q345 steel plate and can be tempered if necessary to have good strength and stability, and can withstand the weight of the large plug valve and the tooling itself. Its thickness is set to 20mm-30mm according to the actual load-bearing requirements to ensure that it will not deform during use. An angle positioning mechanism 200 is provided on the fixed base plate 100. The angle positioning mechanism 200 includes a mounting plate 210 rotatably set on the fixed base plate 100. The parts to be welded can be detachably set on the mounting plate 210. Threaded holes with different mounting holes can be opened on the mounting plate 210 to facilitate the fixing operation during the welding process of parts to be welded of different sizes. The parts to be welded can be detachably set on the mounting plate 210 by bolts, which is convenient for the installation and replacement of plug valves of different specifications. For example, for large stopcock valves with different pipe diameters, stable installation can be achieved by adjusting the installation position of the bolts and selecting suitable connecting accessories. A support member 220 is provided at the lower part of the mounting plate 210. The support member 220 can support and fix the position of the mounting plate 210 with the workpiece to be welded after the position is adjusted. The present invention can adjust the inclination angle of the large workpiece to be welded on the mounting plate 210 by means of a crane-type lifting equipment, and then achieve a firm and stable support and fixation operation of the workpiece to be welded through the support member 220, thereby achieving stable and efficient welding operations, greatly saving unnecessary maintenance costs, and improving the stability and safety performance of the welding operation.

[0029] According to one embodiment of the present invention, Figure 1 and Figure 2One of the support members 220 can adjust the angle between the welding surface of the workpiece to be welded and the horizontal plane to 31°±10°, and the other support member 220 can adjust the angle between the welding surface of the workpiece to be welded and the horizontal plane to -31°±10°. These two specific angle ranges have been verified by a large number of experiments. Welding the sealing surface of the large plug valve at this angle can effectively avoid the flow of welding liquid and ensure the welding quality. The present invention can design the size of the support member 220 according to the distance between the mounting plate 210 and the fixed base plate 100, so that when the support member 220 is fixed on the fixed base plate 100 after polishing, the angle between the fixed base plate 100, the mounting plate 210 and one of the hypotenuses of the right triangle formed between the mounting plate 210 and the fixed base plate 100, that is, the angle between the mounting plate 210 and the fixed base plate 100 is ±31 degrees. At this time, welding the sealing surface of the large plug valve at this angle can avoid the flow of welding liquid and ensure the welding quality.

[0030] According to another embodiment of the present invention, Figure 1 There are at least two support members 220, which are divided into two groups and are located at both ends of the lower part of the mounting plate 210. The present invention can use two groups of support members 220 to firmly limit and support the position of the fixed angle after the mounting plate 210 is tilted, thereby greatly improving the stability of the welding angle.

[0031] The support member 220 includes a connecting plate 221 welded to the lower part of the mounting plate 210. The connecting plate 221 is made of 45 steel and has high strength and toughness after tempering treatment. A support plate 222 is welded to the lower part of the connecting plate 221. The present invention can achieve a firm connection between the support plate 222 and the mounting plate 210 through the connecting plate 221, which greatly improves the stability of the supporting operation of the support member 220.

[0032] The support plate 222 is L-shaped, with rounded corners at the outermost edges to prevent stress concentration on the mounting plate 210 during support. The support plate 222 is made of Q235 steel with a rust-proof surface treatment to ensure long-term reliability. This prevents collision or interference between the support plate 222 and the fixed base plate 100 during rotation of the mounting plate 210.

[0033] According to another embodiment of the present invention, Figure 2As shown, a hinge seat 230 is provided on the fixed base plate 100, and a hinge plate 240 is provided at the lower portion of the mounting plate 210 to cooperate with the hinge seat 230. The hinge seat 230 and the hinge plate 240 are hingedly connected together via a hinge shaft. The hinge shaft is made of 40Cr alloy steel and has been quenched and tempered to have high strength and wear resistance. This hinge structure is simple and reliable, ensuring that the mounting plate 210 can flexibly rotate on the fixed base plate 100. The present invention can achieve not only the rotation of the mounting plate 210 around the hinge shaft under the action of an external force, but also the detachable connection between the fixed base plate 100 and the mounting plate 210, making operation more convenient.

[0034] The position changing tool also includes self-locking mechanisms 300 respectively provided on both sides of the lower ends of the mounting plate 210. The self-locking mechanisms 300 can fix and lock the position of the workpiece to be welded after the position is adjusted.

[0035] The self-locking mechanism 300 includes a first limit seat 310 respectively arranged at both ends of the lower part of the mounting plate 210 and a second limit seat 320 arranged on the fixed base plate 100 and located on the left and right sides of the hinge seat 230. The first limit seat 310 and the second limit seat 320 are both made of Q235 steel and are machined to ensure dimensional accuracy. The first limit seat 310 is located on the inner side of the connecting plate 221, and a limit member 330 is arranged between the first hinge seat 230 and the second limit seat 320. The present invention can lock and fix the position of the mounting plate 210 and the workpiece to be welded thereon by inserting the limit member 330 between the first limit seat 310 and the second limit seat 320 with adjusted position angles, thereby greatly improving the stability of the welding operation.

[0036] A first limiting hole 311 is formed on the first limiting seat 310, and a second limiting hole 321 is formed on the second limiting seat 320. The limiting member 330 is a U-shaped rod-shaped structure. The limiting member 330 is made of 45 steel and has a blackened surface treatment to enhance rust resistance. When the mounting plate 210 is rotated to a predetermined angle, the limiting member 330 is inserted into the corresponding first limiting hole 311 and second limiting hole 321 to fix the position of the mounting plate 210 and prevent displacement during the welding process. The diameter of the limiting member 330 is adapted to the diameter of the first limiting hole 311 and second limiting hole 321. The present invention can insert the two vertical rods of the limiting member 330 into the first limiting hole 311 or the second limiting hole 321 on the same side as the limiting member 330, thereby locking and fixing the adjusted fixed base plate 100 and the mounting plate 210, greatly improving the stability of the welding operation.

[0037] Example 1:

[0038] For welding of 42-inch large plug valve:

[0039] In the production workshop of a valve manufacturing company, the welding positioner tool of the present invention was used to weld the sealing surface of a 42-inch large plug valve. First, a Q345 steel plate with a thickness of 20 mm was selected to make a fixed base plate 100, and the hinge seat 230 and other structures on the fixed base plate 100 were processed according to the designed dimensions.

[0040] The mounting plate 210 is made of 15mm thick Q235 steel plate and is hinged to the hinge seat 230 on the fixed base plate 100 through a high-strength pin. Corresponding threaded holes are processed on the mounting plate 210 according to the mounting hole position of the 42-inch large plug valve.

[0041] The connecting plate 221 of the support member 220 is made of 45# steel, and the support plate 222 is made of Q235 steel into an L-shaped structure with a 5mm radius at the corner. The support member 220 is installed at both ends of the lower part of the mounting plate 210 according to the design requirements.

[0042] The first limiting seat 310 and the second limiting seat 320 of the self-locking mechanism 300 are both made of Q235 steel, and the limiting member 330 is made of 45# steel into a U-shaped rod structure, the diameter of which is adapted to the diameter of the limiting hole on the limiting seat.

[0043] Install the 42-inch large plug valve on the mounting plate 210 with M16 bolts, and use the crane in the workshop to lift the mounting plate 210. Adjust the crane height so that the mounting plate 210 is rotated to a position where the support member 220 on one side can support it. At this time, the angle between the surface to be welded and the horizontal plane is 30°, which is within the range of 31°±10°. Insert the limiter 330 to fix the position of the mounting plate 210, start the robot arm, set the welding current to 200A, the voltage to 25V, and the welding speed to 3mm / s, and weld the left half of the sealing surface. After welding is completed, pull out the limiter 330, and use the crane to rotate the mounting plate 210 to a position where the support member 220 on the other side can support it. The angle between the surface to be welded and the horizontal plane is -32°, which is also within the range of -31°±10°. Insert the limiter 330 again to fix it, adjust the welding parameters of the robot arm to a current of 210A, a voltage of 26V, and a welding speed of 3.5mm / s, and weld the right half of the sealing surface. After welding was completed, the weld quality was checked and no obvious signs of welding liquid flow were found. The weld was flat and smooth. After testing, the welding quality met the company standards.

[0044] Example 2:

[0045] 50-inch large plug valve welding:

[0046] At another valve manufacturing company, the tooling of the present invention was also used to weld a 50-inch large plug valve. The material selection and manufacturing process for the fixed base plate 100, mounting plate 210, support member 220, and self-locking mechanism 300 were essentially the same as those in Example 1. However, the bolt mounting hole positions and connection accessories on the mounting plate 210 were appropriately adjusted based on the size of the 50-inch large plug valve.

[0047] After the 50-inch large plug valve is installed on the mounting plate 210, the position change operation is performed using a crane. When the mounting plate 210 is rotated to the support position of the support member 220 on one side, the angle between the surface to be welded and the horizontal plane is 33°. After fixing the mounting plate 210, the robot arm sets the welding current to 220A, the voltage to 27V, and the welding speed to 3.2mm / s to weld the left half of the sealing surface. After completion, it is shifted to the support position of the support member 220 on the other side, the angle between the surface to be welded and the horizontal plane is -29°, and the welding current is set to 230A, the voltage to 28V, and the welding speed to 3.8mm / s to weld the right half of the sealing surface. After welding is completed, the weld is inspected for flaws, and the qualified rate reaches more than 98%. Compared with the previous use of traditional tooling, the welding qualified rate has increased by 15%.

[0048] Example 3:

[0049] 54-inch large plug valve welding:

[0050] At a large valve production base, the present invention's tooling was used for welding 54-inch large plug valves. During tooling production, the strength of components such as the fixed base plate 100 and the mounting plate 210 was appropriately strengthened to meet the heavy-weight bearing requirements of the 54-inch large plug valves.

[0051] A 54-inch large plug valve was installed on mounting plate 210, and the angle of mounting plate 210 was adjusted using a crane. During the welding process, the method of use of the present invention was strictly followed. When welding the left half of the sealing surface, the welding parameters were controlled to be 240A current, 29V voltage, and 3.6mm / s welding speed; when welding the right half of the sealing surface, the welding parameters were adjusted to 250A current, 30V voltage, and 4mm / s welding speed. The sealing performance of the finally welded 54-inch large plug valve was tested to fully comply with relevant industry standards, and production efficiency was increased by 60% compared to before, effectively enhancing the company's market competitiveness.

[0052] The method of using the present invention:

[0053] First of all, it should be made clear that the positioner tooling involved in the present invention is mainly used to adjust the inclination angle of the workpiece to be welded during welding. The present invention takes the welding of a large plug valve as an example to explain its usage in detail. When it is necessary to weld the sealing surface of a large plug valve, the crane and automatic welding robot used in conjunction with it must have corresponding specifications and performance to adapt to the welding operation requirements of large-size plug valves.

[0054] The crane typically used is the Gantry model, manufactured by Wuxi Fengwei Machinery Equipment Co., Ltd. This crane boasts a strong load capacity, meeting the lifting needs of large plug valves ranging from 42 to 54 inches and their associated tooling. Its operating voltage can be flexibly selected from 220V, 380V, 440V, or a custom voltage, depending on the actual workshop power supply, offering high versatility. With a monthly production capacity of up to 550 units, this crane is widely used in the market, reliably lifting and lowering large plug valve welding positioner tooling, providing reliable support for angle adjustment during the welding process.

[0055] For automatic welding robots, the recommended option is the XB series cantilever nine-axis welding workstation from Jiangsu Connet Intelligent Robot Co., Ltd. Taking the model KDDG0012-02 as an example, it features an extra-large arm span and enables precise multi-degree-of-freedom control, meeting the complex welding trajectory requirements of large plug valve sealing surfaces. This workstation has a recommended working range of W3500L14000H2200mm, covering an area of ​​3000*15000mm, making it suitable for welding large workpieces. When welding large plug valves, the system precisely follows the preset welding procedure, performing high-quality welding on the sealing surface of the plug valve at two specific angles, 31° and -31°, effectively ensuring welding quality and efficiency.

[0056] The working principle and usage are as follows:

[0057] Working principle: When using the welding displacement fixture of the present invention, first install the large stopcock on the mounting plate 210 with bolts. Then, use the crane to lift the mounting plate 210 with the large stopcock, and adjust the lifting and lowering height of the crane to rotate the mounting plate 210 around the hinge axis. When the mounting plate 210 is rotated to a position where the support member 220 on one side can support it, that is, when the angle between the surface to be welded and the horizontal plane reaches 31°±10°, the crane operation is stopped. At this time, the support member 220 supports the mounting plate 210. Since the flow of welding liquid can be effectively prevented within this angle range, the welding motion program of the left half of the sealing surface can be set by the robot arm to start the welding operation. After the welding is completed, the crane is used to lift the mounting plate 210 again, so that it is rotated around the hinge axis to a position where the support member 220 on the other side can support it, that is, when the angle between the surface to be welded and the horizontal plane reaches -31°±10°, the crane is stopped, and the support member 220 supports the mounting plate 210. Next, the robotic arm sets the welding motion program for the right half of the sealing surface and begins welding. Throughout this process, the stopper 330 in the self-locking mechanism 300 inserts into the stopper hole after the mounting plate 210 rotates to a predetermined angle, securing the mounting plate 210 in position and ensuring the stability of the welding process. Furthermore, the fixed base plate 100, mounting plate 210, support member 220, and hinged structure all work together to ensure the positional accuracy and stability of the large plug valve during welding.

[0058] Directions:

[0059] Tooling preparation: Check that the fixed base plate 100, mounting plate 210, support member 220, self-locking mechanism 300 and other components are intact and that all connections are secure. Clean any debris and oil from the tooling surface and ensure that the surface where the large plug valve will be installed is flat and clean.

[0060] Install the plug valve: Select appropriate bolts and connecting accessories according to the specifications and dimensions of the large plug valve, and install the large plug valve on the mounting plate 210, ensuring that it is firmly installed and will not be displaced during subsequent operations.

[0061] Positioning operation: Use the crane to lift the mounting plate 210 with the large plug valve, and slowly adjust the lifting and lowering height of the crane to rotate the mounting plate 210 around the hinge axis. When the mounting plate 210 rotates to a position where one of the supports 220 can support it, and the angle between the surface to be welded and the horizontal plane is close to 31°±10°, stop the crane. Observe whether the mounting plate 210 is placed stably on the support 220. If necessary, fine-tune the crane position so that the mounting plate 210 is completely in contact with the support 220. Then, insert the limiting member 330 in the self-locking mechanism 300 into the corresponding first limiting hole 311 and second limiting hole 321 to fix the position of the mounting plate 210.

[0062] Welding: Start the robotic arm and set the appropriate welding motion program based on the shape and size of the left half of the large plug valve's sealing surface. Adjust welding parameters such as welding current, voltage, and speed to ensure weld quality. Begin welding the left half of the sealing surface. Closely monitor the welding process and pause immediately to make adjustments if any abnormalities are detected.

[0063] Repositioning and welding: After the welding of the left half of the sealing surface is completed, pull out the limiter 330 from the limiter hole. Use the crane to lift the mounting plate 210 again, and rotate it around the hinge axis to a position where the support member 220 on the other side can support it. When the angle between the surface to be welded and the horizontal plane is close to -31°±10°, stop the crane. Similarly, after ensuring that the mounting plate 210 is stably placed on the support member 220, insert the limiter 330 to fix the mounting plate 210. Then, according to the condition of the right half of the sealing surface of the large plug valve, reset the welding motion program and welding parameters of the robot arm, and perform the welding operation on the right half of the sealing surface.

[0064] Welding Completion and Cleaning: After welding is complete, shut down the robotic arm and welding equipment. Remove the stopper 330, use the crane to lift the mounting plate 210 off the support 220, and remove the welded large plug valve. Clean any welding slag and debris from the tooling surface, inspect and maintain the tooling, and prepare it for the next use.

[0065] The present invention can realize stable, safe and efficient welding operations at specific angles on large workpieces to be welded by using the angle positioning mechanism 200 in conjunction with a crane-type lifting device, which is more energy-efficient and stable and saves maintenance costs.

[0066] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0067] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A large plug valve welding position change tool, comprising a fixed base plate (100), characterized in that: An angle positioning mechanism (200) is provided on the fixed base plate (100), and the angle positioning mechanism (200) comprises a mounting plate (210) rotatably provided on the fixed base plate (100), and the parts to be welded are detachably provided on the mounting plate (210), and a support member (220) is provided at the lower part of the mounting plate (210), and the support member (220) can support and fix the position of the mounting plate (210) with the parts to be welded after the position is adjusted.

2. The large plug valve welding position changing tool as claimed in claim 1, characterized in that: One of the support members (220) can adjust the angle between the surface to be welded of the workpiece to be welded and the horizontal plane to 31°±10°, and the other support member (220) can adjust the angle between the surface to be welded of the workpiece to be welded and the horizontal plane to -31°±10°.

3. The large plug valve welding position changing tool as claimed in claim 2, characterized in that: There are at least two supporting members (220), which are divided into two groups and are respectively located at the two ends of the lower part of the mounting plate (210).

4. The large plug valve welding position changing tool as claimed in claim 3, characterized in that: The support member (220) comprises a connecting plate (221) arranged at the lower portion of the mounting plate (210), and a supporting plate (222) is arranged at the lower portion of the connecting plate (221).

5. The large plug valve welding position changing tool as claimed in claim 4, characterized in that: The support plate (222) is L-shaped, and the outermost corners are arc corners.

6. The large plug valve welding position changing tool as claimed in claim 5, characterized in that: A hinge seat (230) is provided on the fixed base plate (100), and a hinge plate (240) matching the hinge seat (230) is provided at the lower part of the mounting plate (210). The hinge seat (230) and the hinge plate (240) are hinged together via a hinge shaft.

7. The large plug valve welding position changing tool as claimed in claim 6, characterized in that: The displacement tool also includes self-locking mechanisms (300) respectively provided on both sides of the lower ends of the mounting plate (210), and the self-locking mechanisms (300) can fix and lock the position of the workpiece to be welded after the position is adjusted.

8. The large plug valve welding position changing tool as claimed in claim 7, characterized in that: The self-locking mechanism (300) comprises a first limiting seat (310) respectively arranged at two ends of the lower portion of the mounting plate (210) and a second limiting seat (320) arranged on the fixed base plate (100) and located on the left and right sides of the hinge seat (230), wherein the first limiting seat (310) is located on the inner side of the connecting plate (221), and a limiting member (330) is arranged between the first hinge seat (230) and the second limiting seat (320).

9. The large plug valve welding position changing tool as claimed in claim 8, characterized in that: The first limiting seat (310) is provided with a first limiting hole (311), the second limiting seat (320) is provided with a second limiting hole (321), and the limiting member (330) is a U-shaped rod-shaped structure, and its diameter is adapted to the diameters of the first limiting hole (311) and the second limiting hole (321).

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