Welding device and welding method for double-end equal-diameter framework based on valve body structure

Abstract

The invention provides a welding device and method for a double-end equal-diameter framework based on a valve body structure, and belongs to the technical field of valve welding. The welding device comprises a positioning main body, a positioning bearing plate is arranged at one end of the outer side of the positioning main body, and a concentric positioning column is arranged at one end of the inner side of a positioning column; the concentric positioning column axially penetrates into the two symmetrically-arranged valve body center holes, and a middle positioning plate is arranged on the concentric positioning column. When the gateway plates are welded, the middle positioning plate is embedded into the positioning groove, it can be guaranteed that the centers of the two gateway plates coincide with the axis of the concentric positioning column, and it is indirectly guaranteed that the center of the valve body coincide with the centers of the gateway plates. The positioning step of the side positioning plate clings to the upper edge of the valve body, and the inner side of the gateway plate clings to the middle positioning plate and the side positioning plate simultaneously by rotating and adjusting the valve body, so that the gateway plate and the upper edge of the valve body can be vertically positioned.

Description

Technical Field

[0001] The present invention belongs to the technical field of valve welding, and more specifically, relates to a welding device and a welding method for a double-end equal-diameter frame based on a valve body structure. Background Art

[0002] Knife gate valves are key components used to throttle slurry during equipment maintenance in the power, metallurgy, coal and other industries. The service life of the valve seat, the core sealing component, directly determines the overall life of the valve. The valve body, as the peripheral support structure of the valve seat, not only bears the installation and positioning functions of the valve seat, but its processing accuracy also significantly affects the flexibility of the gate lift. During the gate lift process, the gap around the cross section of the valve body channel and the gate is only 1mm. The extremely small gap requires the valve body channel to have extremely high processing accuracy, otherwise it is easy to cause the gate to scratch the channel, causing operation jams.

[0003] At present, the main processing method for valve bodies is welding, and its structural feature is that the valve bodies on both sides are symmetrically distributed along the center line of the gate channel. However, during the welding process, how to ensure the center alignment (i.e. concentricity) of the valve bodies on both sides and the parallelism of the left and right gate plates has become a key technical difficulty that restricts the processing accuracy of the valve body. Traditional welding methods make it difficult to accurately control the relative position of the double-end equal-diameter skeleton, which can easily lead to non-concentricity of the inner circle of the valve body and deviation of the gate plate position, thereby affecting the installation accuracy of the valve seat and the smoothness of the gate movement, ultimately shortening the service life of the valve and increasing the equipment maintenance cost. Summary of the invention

[0004] The purpose of the present invention is to provide a welding device for a double-end equal-diameter skeleton based on a valve body structure, which can effectively ensure the concentricity of the double-end skeleton of the valve body and the processing accuracy of the gate plate to meet the needs of high-precision valve manufacturing.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a welding device of a double-end equal-diameter skeleton based on a valve body structure, including a positioning body, a positioning support plate is arranged at the outer end of the positioning body, and a concentric positioning column is arranged at the inner end of the positioning body, and the concentric positioning column axially penetrates into two symmetrically arranged valve body center holes, and the outer periphery of the concentric positioning column has a positioning arc surface, and the positioning arc surface circumferentially fits the inner walls of the center holes of the two valve bodies, and a middle positioning plate is arranged on the concentric positioning column, and the middle positioning plate is located in the middle between the two valve bodies, and the thickness of the middle positioning plate is the same as the thickness of the gate plate, and the two sides of the middle positioning plate are respectively provided with middle positioning planes, and the middle positioning planes are fitted to the middle of the inner wall of the valve plate on the same side.

[0006] In a possible implementation, it further includes side positioning plates located on either side between two valve bodies. The thickness of the side positioning plates is the same as that of the gate plates. Both sides of the side positioning plates are respectively provided with side positioning planes, and the side positioning planes are attached to the inner side walls of the valve channel plates on the same side.

[0007] In a possible implementation, an external plate is provided at one end of the side positioning plate away from the middle positioning plate. The thickness of the external plate is greater than that of the side positioning plate. A positioning step is formed between the external plate and the side positioning plate, and the positioning step is attached to the outer wall of the opposite end of the valve body.

[0008] In a possible implementation, the positioning body is a cylinder, and a weight-reducing hole is axially formed through the cylinder.

[0009] In a possible implementation, an avoidance groove is circumferentially formed on the outer wall of the cylinder, and the avoidance groove is located between the positioning support plate and the concentric positioning column.

[0010] In a possible implementation, a positioning groove is axially formed at one end of the concentric positioning column away from the positioning support plate. The axis of the middle positioning plate is clamped in the positioning groove, and the positioning groove is used to limit the axial displacement and circumferential rotation of the middle positioning plate.

[0011] In a possible implementation, the positioning groove includes a transverse positioning groove and two longitudinal positioning grooves. The transverse positioning groove is transversely formed at one end of the concentric positioning column away from the positioning support plate. The two longitudinal positioning grooves are respectively arranged at both ends of the transverse positioning groove and communicate with the transverse positioning groove. The middle positioning plate is inserted into the transverse positioning groove. Positioning end plates bent to one side are respectively provided at both ends of the middle positioning plate, and both positioning end plates are conformally inserted into the two longitudinal positioning grooves.

[0012] The beneficial effects of the welding device for the double - end equal - diameter skeleton based on the valve body structure provided by the present invention are as follows: Compared with the prior art, the welding device for the double - end equal - diameter skeleton based on the valve body structure of the present invention horizontally arranges the positioning main body, uses the positioning support plate at the bottom to carry the first valve body, and with the help of the positioning column and the positioning arc surface, accurately positions the central hole of the first valve body. When the flange end of the first valve body abuts against the upper end surface of the positioning support plate and the inner wall of the central hole fits the positioning arc surface, its center position is precisely fixed, laying a solid foundation for all subsequent assembly and welding processes. Similarly, the second valve body is positioned by the same principle, ensuring that the double - end valve bodies maintain extremely high concentricity from the very beginning, avoiding problems such as unbalanced valve body structure and poor sealing caused by positioning deviation of the valve body, and greatly improving the overall stability and reliability of the valve body. The positioning plane of the middle positioning plate and the side positioning plate are aligned and parallel to the side wall of the valve body, creating conditions for positioning the gate plate. With the inner wall of the gate plate closely fitting the double - positioning plane, its position in the horizontal direction is strictly limited. Whether it is the distance between the gate plates or their perpendicularity relative to the valve body, they can be accurately controlled, effectively preventing the gate plates from being skewed or misaligned after welding, ensuring the processing accuracy of the gate plates, and thus ensuring the smoothness and regularity of the internal flow channel of the valve and improving the fluid transmission performance of the valve. By making the positioning step of the side positioning plate closely fit the outside of the support plate, and cooperating with the design that the side positioning plate penetrates the strip - shaped hole of the support plate and inserts into the valve plate channel, the support plate is firmly fixed from multiple angles. This makes the support plate not only accurately positioned during welding but also form a stable connection structure with the valve body and the gate plate, enhancing the rigidity of the entire valve body skeleton and providing strong support for the stable operation of the valve under high - pressure and high - strength working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following - described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 It is a schematic structural diagram of the positioning main body provided by the present invention; Figure 2 It is a schematic structural diagram of the middle positioning plate provided by the present invention; Figure 3 It is a schematic structural diagram of the side positioning plate provided by the present invention; Figure 4 It is a state diagram of welding the gate plate provided by the present invention; Figure 5 It is a state diagram of welding the support plate provided by the present invention.

[0015] In the figure: 100, positioning body; 110, positioning support plate; 120, concentric positioning column; 121, positioning arc surface; 122, transverse positioning groove; 123, longitudinal positioning groove; 130, middle positioning plate; 131, middle positioning plane; 132, positioning end plate; 140, side positioning plate; 141, side positioning plane; 142, external plate; 143, positioning step; 150, weight reduction hole; 160, avoidance groove; 200, first valve body; 300, second valve body; 400, gate plate; 500, support plate. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] Unless explicitly defined otherwise, the use of terms such as "first," "second," or "third," etc., are intended to distinguish different objects rather than to describe a specific order.

[0018] Unless otherwise expressly defined, directional words such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", "high", "low", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, so they cannot be understood as limiting the specific scope of protection of the present invention.

[0019] See also Figures 1 to 5 , the double-end equal-diameter skeleton welding device based on the valve body structure provided by the present invention is now described. The double-end equal-diameter skeleton welding device based on the valve body structure includes a positioning body 100, a positioning support plate 110 is provided at one end of the outer side of the positioning body 100, a concentric positioning column 120 is provided at one end of the inner side of the positioning body 100, the concentric positioning column 120 axially penetrates into two symmetrically arranged valve body center holes, the outer periphery of the concentric positioning column 120 is provided with a positioning arc surface 121, the positioning arc surface 121 circumferentially fits the inner wall of the center hole of the two valve bodies, a middle positioning plate 130 is provided on the concentric positioning column 120, the middle positioning plate 130 is located in the middle between the two valve bodies, the thickness of the middle positioning plate 130 is the same as the thickness of the gate plate 400, and the two sides of the middle positioning plate 130 are respectively provided with middle positioning planes 131, and the middle positioning planes 131 fit the middle of the inner side wall of the valve plate on the same side.

[0020] The welding device for a double-end equal-diameter skeleton based on a valve body structure provided by the present invention, compared with the prior art, axially penetrates the concentric positioning column 120 into the central holes of two symmetrically arranged valve bodies, and the positioning arc surface 121 on its outer periphery circumferentially fits the inner walls of the central holes of the two valve bodies. Since the positioning arc surface 121 closely fits the inner wall of the valve body central hole, it can limit the position of the valve body in the circumferential direction, make the central holes of the two valve bodies coincide with the axis of the concentric positioning column 120, and further ensure the centering of the centers of the two valve bodies. The middle positioning plate 130 is located in the middle between the two valve bodies and has the same thickness as the gate plate 400. The middle positioning planes 131 on both sides of it respectively fit the middle parts of the inner side walls of the same-side valve plates. During the welding process, by fitting with the middle parts of the inner side walls of the valve plates, the movement of the valve plates in the direction perpendicular to the middle positioning plate 130 is restricted, making the left and right gate plates 400 respectively parallel to the two side surfaces of the middle positioning plate 130, thereby ensuring the parallelism between the left and right gate plates 400. The welding device for a double-end equal-diameter skeleton based on a valve body structure provided by the present invention can effectively ensure the concentricity of the double-end skeletons of the valve body and the machining accuracy of the gate plate 400 to meet the requirements of high-precision valve manufacturing.

[0021] Please refer to Figures 3 to 4 , the welding device for a double-end equal-diameter skeleton based on a valve body structure further includes a side positioning plate 140. The side positioning plate 140 is located on either side between the two valve bodies. The thickness of the side positioning plate 140 is the same as that of the gate plate 400. Both sides of the side positioning plate 140 are respectively provided with side positioning planes 141, and the side positioning planes 141 fit one side of the inner side wall of the same-side valve plate. The thickness of the side positioning plate 140 is consistent with that of the gate plate 400, and the side positioning planes 141 on both sides fit one side of the inner side wall of the same-side valve plate. Cooperating with the middle positioning plate 130, it constructs a multi-dimensional precise positioning system. This ensures that the valve plate is in an accurate position in the welding preparation stage, effectively avoiding deviations such as translation and rotation of the valve plate during the welding process, enabling the welding connection points between the valve plate and the valve body to be accurately positioned, greatly improving the quality of the welded joints, reducing weld defects such as pores, cracks, and lack of penetration, thereby ensuring the sealing performance and reliability of the entire valve body structure and meeting the strict industrial application standards.

[0022] For the welding of double-end equal-diameter skeletons, stable positioning is the key to achieving symmetric welding and ensuring the overall dimensional accuracy of the product. The side positioning plate 140 assists the concentric positioning column 120 in centering the centers of the valve bodies and controlling the parallelism of the gate plate 400, making the welded valve body skeleton highly precise in axial and radial dimensions, with good product consistency and facilitating subsequent assembly and integration with other components.

[0023] The side positioning plate 140 shares part of the welding stress. During the welding process, uneven heating of the valve body structure generates stress. Originally, these stresses were mainly concentrated on the middle positioning plate 130 and the connection part between the valve channel plate and the valve body, which easily caused wear and deformation of the middle positioning plate 130, thereby affecting the tooling accuracy. After the side positioning plate 140 intervenes, the stress is dispersed to itself, reducing the load on the middle positioning plate 130. This makes the wear rate of the key positioning components of the entire tooling fixture decrease, extends the service life, and reduces the production interruption and cost input caused by frequent tooling replacement.

[0024] An external plate 142 is provided at one end of the side positioning plate 140 away from the middle positioning plate 130. The thickness of the external plate 142 is greater than that of the side positioning plate 140. A positioning step 143 is formed between the external plate 142 and the side positioning plate 140, and the positioning step 143 fits against the outer wall of the opposite end of the valve body. As an important component in the double-end equal-diameter skeleton welding device based on the valve body structure, the side positioning plate 140 extends out an external plate 142 at one end away from the middle positioning plate 130. The external plate 142 and the side positioning plate 140 present a stepped layout, with a difference in their thicknesses. The external plate 142 is thicker, and thus a positioning step 143 is naturally formed at their junction. During the assembly process of the entire welding device, this positioning step 143 can accurately and tightly fit against the outer wall of the opposite end of the valve body, applying positioning constraints from the outer side direction of the valve body.

[0025] The fitting of the positioning step 143 against the outer wall of the opposite end of the valve body provides an accurate radial positioning function for the valve body. The concentric positioning column 120 focuses on ensuring the centering of the valve body center in the axial direction, while the positioning step 143 controls from the circumferential direction of the valve body. The two complement each other and firmly fix the valve body in the predetermined spatial position. This makes it so that during the welding process, the valve body will not generate radial displacement due to factors such as welding thermal stress and slight loosening of the tooling fixture, ensuring that the center of the valve body always conforms to the design requirements, laying a foundation for subsequent high-quality welding. In addition, the side positioning plate 140 itself is responsible for laterally positioning the valve channel plate to ensure its parallelism. And the positioning of the valve body by the positioning step 143 at the end makes the relative position relationship between the valve body and the valve channel plate closer and more accurate. The valve channel plate can maintain the best fitting state with the valve body according to the double constraints of the side positioning plate 140 and the positioning step 143 during welding, reducing possible problems such as gaps and misalignments between the two, improving the quality of the welded joint, and thereby ensuring the sealing and reliability of the valve body structure.

[0026] During the welding process, the valve body structure is subjected to various external forces such as thermal stress from welding and clamping force of the tooling fixture. The positioning step 143 provides support from the outside of the valve body, sharing part of the pressure that was originally concentrated on components such as the concentric positioning column 120 and the middle positioning plate 130. This makes the overall force on the tooling fixture more balanced, reducing the risk of deformation and wear of key positioning components due to uneven force, extending the service life of the tooling fixture, and reducing the tooling maintenance cost during the production process.

[0027] Please refer to Figure 1 , the positioning body 100 is a cylinder, and a weight-reducing hole 150 is axially drilled through the cylinder. The weight-reducing hole 150 can reduce the weight of the positioning body 100 itself. In scenarios such as valve body welding where the tooling fixture needs to be frequently carried and operated, reducing the weight of the tooling can directly reduce the labor intensity of the operator and improve work efficiency. The weight-reducing hole 150 can also reduce the raw materials required for the positioning body 100, thereby reducing the overall manufacturing cost.

[0028] In addition, during the welding process, the temperature around the positioning body 100 will rise. Due to the existence of the weight-reducing hole 150, air can circulate in the hole, playing a role similar to a heat dissipation duct. Compared with a solid cylinder positioning body 100, the design with the weight-reducing hole 150 can dissipate heat more quickly, preventing the positioning body 100 from deforming due to overheating, thereby ensuring welding accuracy and extending the service life of the tooling.

[0029] When the welding device is in operation, the weight-reducing hole 150 of the cylindrical positioning body 100 can also change the sound propagation path and reflection characteristics. After the sound wave enters the weight-reducing hole 150, it will be reflected and refracted multiple times, and the energy gradually decays, reducing the noise generated by the entire welding device. This not only improves the working environment in the workshop but also is beneficial to the physical and mental health of employees, reducing problems such as hearing damage caused by noise pollution.

[0030] An avoidance groove 160 is circumferentially formed on the outer wall of the cylinder, and the avoidance groove 160 is located between the positioning support plate 110 and the concentric positioning column 120. The shape of the avoidance groove 160 is usually annular, and its dimensions such as depth and width are determined according to actual design requirements and functional requirements. It surrounds the outer wall of the cylinder, providing a certain amount of space allowance for related components or operations. During the assembly and working process of the welding device, the avoidance groove 160 can effectively avoid possible interference problems between the positioning support plate 110, the concentric positioning column 120, and other related components.

[0031] In addition, the presence of the relief groove 160 increases the surface area of the outer wall of the cylinder, and the heat generated during the welding process can be dissipated more quickly through the larger surface area. Air can flow within the relief groove 160 to form a certain convection, enhancing the heat dissipation capacity, helping to maintain the temperature of the positioning body 100 and the surrounding components within a reasonable range, reducing part deformation or performance degradation caused by excessive temperature, and improving the stability and reliability of the device. During the welding process, due to factors such as thermal expansion and contraction, the positioning body 100 may generate certain stresses. The presence of the relief groove 160 can disperse these stresses to a certain extent, preventing the stresses from concentrating excessively at the connection part between the positioning support plate 110 and the concentric positioning column 120. This helps to improve the structural strength and service life of the positioning body 100, and reduces the risk of cracks or damage caused by stress concentration.

[0032] Please refer to Figure 1 , a positioning groove is axially provided at one end of the concentric positioning column 120 away from the positioning support plate 110, and the axis of the middle positioning plate 130 is clamped in the positioning groove. The positioning groove is used to limit the axial displacement and circumferential rotation of the middle positioning plate 130. The shape and size of the positioning groove are adapted to the middle positioning plate 130, so that the middle positioning plate 130 can be clamped in the positioning groove with its axis as the reference. This clamping method is tight and stable, thereby realizing the constraint of the middle positioning plate 130 in both the axial and circumferential dimensions. By clamping the middle positioning plate 130 in the positioning groove, the position of the middle positioning plate 130 on the concentric positioning column 120 can be determined. In the welding device, the middle positioning plate 130 plays an important role in separating and positioning the gate plate 400 between the valve bodies. Its accurate position is crucial for ensuring the parallelism of the left and right gate plates 400 and the relative position relationship between the valve bodies. The positioning groove ensures that the middle positioning plate 130 does not undergo axial displacement, preventing it from moving due to forces and other factors during the welding process, thus ensuring the correct installation position of the gate plate 400. Limiting the circumferential rotation of the middle positioning plate 130 can prevent the position of the gate plate 400 from shifting due to rotation during the welding process. The accurate parallelism of the gate plate 400 is the key to ensuring the sealing performance and functionality of the valve body structure. The circumferential stability of the middle positioning plate 130 can effectively maintain the parallel state of the gate plate 400, improve the welding quality, and reduce problems such as leakage caused by the position deviation of the gate plate 400.

[0033] The setting of the positioning groove makes the installation of the middle positioning plate 130 more convenient. During the assembly process, the operator only needs to align the middle positioning plate 130 with the axis of the positioning groove and snap it in, without complex adjustment and measurement steps. This not only improves the assembly efficiency, but also reduces the requirements for the operator's skill level, reduces the assembly errors caused by improper manual operation, and is conducive to the popularization of large-scale industrial production. During the quality inspection process, the matching situation between the positioning groove and the middle positioning plate 130 can be used as an important inspection index. By checking whether the middle positioning plate 130 is correctly snapped into the positioning groove and whether there is looseness, etc., it is possible to quickly judge whether the installation of the tooling is in place, so as to timely discover and solve potential quality problems, which helps to improve the overall quality control level of the product.

[0034] Please refer to Figure 1, the positioning groove includes a transverse positioning groove 122 and two longitudinal positioning grooves 123. The transverse positioning groove 122 is horizontally opened at one end of the concentric positioning post 120 away from the positioning support plate 110. The two longitudinal positioning grooves 123 are respectively arranged at both ends of the transverse positioning groove 122 and communicate with the transverse positioning groove 122. The middle positioning plate 130 is inserted into the transverse positioning groove 122. Both ends of the middle positioning plate 130 are respectively provided with positioning end plates 132 bent towards one side. The two positioning end plates 132 are conformally inserted into the two longitudinal positioning grooves 123. The transverse positioning groove 122 is opened along the transverse direction, constituting the main installation area of the middle positioning plate 130. The two longitudinal positioning grooves 123 are respectively located at both ends of the transverse positioning groove 122 and communicate with the transverse positioning groove 122 to form a "work" - shaped positioning space. The main body part of the middle positioning plate 130 is inserted into the transverse positioning groove 122, and each of its two ends has a positioning end plate 132 bent towards one side. The shapes of the two positioning end plates 132 match the longitudinal positioning grooves 123, and can be tightly inserted into the corresponding longitudinal positioning grooves 123, so as to realize the firm installation of the middle positioning plate 130 on the concentric positioning post 120. The transverse positioning groove 122 plays a longitudinal (perpendicular to the length direction of the transverse positioning groove 122) positioning role for the middle positioning plate 130, restricting its longitudinal movement in the horizontal direction; the two longitudinal positioning grooves 123, through cooperation with the positioning end plates 132, restrict the transverse movement of the middle positioning plate 130 and its rotation around the axis. This multi - dimensional positioning method ensures that the middle positioning plate 130 can maintain an accurate position during the welding process, thereby ensuring the parallelism of the valve passage plate and the relative position accuracy between the valve body. The design of inserting the positioning end plates 132 into the longitudinal positioning grooves 123 increases the contact area and connection strength between the middle positioning plate 130 and the concentric positioning post 120. During the welding process, it can better disperse the welding stress, prevent the middle positioning plate 130 from loosening or displacing, make the structure of the entire welding device more stable and reliable, improve the welding quality and product consistency. This structure is relatively convenient for assembly and disassembly. The middle positioning plate 130 can be inserted and removed along the directions of the transverse positioning groove 122 and the longitudinal positioning grooves 123, without complex tools or special assembly processes, reducing the assembly difficulty, improving the production efficiency, and also facilitating the later maintenance and replacement of the tooling.

[0035] In addition, due to the conformal insertion of the positioning end plates 132 and the longitudinal positioning grooves 123, during the long - term use process, when the welding device is subjected to repeated stress, the stress can be more evenly distributed at the connection part of the positioning groove and the middle positioning plate 130. Compared with a single positioning method, this structure can effectively reduce local stress concentration, improve the fatigue resistance of the entire tooling, extend the service life of the tooling, and reduce production interruptions and cost increases caused by tooling damage.

[0036] Based on the same inventive concept, please refer to Figures 1 to 5 , the present invention also provides a welding method for a double-ended equal-diameter skeleton based on a valve body structure, using the above-mentioned welding device for a double-ended equal-diameter skeleton based on a valve body structure, including the following steps: S1: Horizontally place the positioning main body 100, with the positioning support plate 110 at the bottom of the positioning main body 100. Sleeve the first valve body 200 from top to bottom onto the positioning column until the flange end of the first valve body 200 abuts against the upper end face of the positioning support plate 110, and the inner wall of the central hole of the first valve body 200 fits the positioning arc surface 121.

[0037] The positioning support plate 110 provides stable support for the first valve body 200, ensuring that it will not displace during subsequent operations and guaranteeing the basic position accuracy of welding. The cooperation of the positioning column and the positioning arc surface 121 can accurately position the first valve body 200, making the center of the first valve body 200 coincide with the axis of the positioning column, laying a good foundation for subsequent assembly and welding work and guaranteeing the concentricity of the entire valve body structure.

[0038] S2: Place the middle positioning plate 130 on the concentric positioning column 120, and horizontally place the side positioning plate 140 on one side of the upper end face of the first valve body 200, so that the middle positioning plane 131 and the side positioning plane 141 are in the same plane and parallel to the side wall of the first valve body 200.

[0039] The placement of the middle positioning plate 130 and the side positioning plate 140 provides an accurate positioning reference for the subsequent installation of the gate plate 400, guaranteeing the installation position accuracy and relative parallelism of the gate plate 400. The middle positioning plane 131 and the side positioning plane 141 being in the same plane and parallel to the side wall of the first valve body 200 can ensure that the two gate plates 400 remain parallel after installation, thereby improving the overall sealing performance and functionality of the valve body structure.

[0040] S3: Place the two gate plates 400 on both sides of the upper end face of the first valve body 200 respectively, with the inner walls of the gate plates 400 simultaneously fitting the middle positioning plane 131 and the side positioning plane 141, fix the two gate plates 400 and perform welding.

[0041] The dual positioning effect of the middle positioning plane 131 and the side positioning plane 141 ensures the accurate installation position of the gate plate 400, improving the connection accuracy and welding quality between the gate plate 400 and the first valve body 200. The method of first fixing the gate plate 400 with a clamp and then performing welding can effectively prevent the gate plate 400 from displacing during welding, guaranteeing the strength and sealing performance of the welded joint and improving the reliability of the entire valve body structure.

[0042] S4: Remove the middle positioning plate 130 and the side positioning plate 140, and relatively fasten the second valve body 300 onto the two gate plates 400 on the upper end surface of the first valve body 200. The second valve body 300 is sleeved on the positioning posts, and the inner wall of the central hole fits the positioning arc surface 121. Fix the first valve body 200 and the second valve body 300 and weld the second valve body 300.

[0043] The reuse of the positioning posts and the positioning arc surface 121 ensures the concentricity between the second valve body 300 and the first valve body 200, and guarantees the coaxiality and stability of the entire valve body structure. The method of first fixing with a clamp and then welding can effectively avoid the deformation and displacement of the valve body caused by factors such as thermal stress during the welding process, and improves the welding quality and the overall performance of the product.

[0044] S5: Vertically place the support plate 500 on the same side of the first valve body 200 and the second valve body 300. The side positioning plate 140 penetrates the strip-shaped hole of the support plate 500 from the outside to the inside and inserts into the valve plate channel between the two valve plates. Use the positioning step 143 of the side positioning plate 140 to press tightly against the outside of the support plate 500 and weld the support plate 500. Finally, remove the side positioning plate 140.

[0045] The positioning step 143 of the side positioning plate 140 can accurately position and fix the support plate 500, ensuring the installation position accuracy and stability of the support plate 500. By the way that the side positioning plate 140 penetrates the strip-shaped hole of the support plate 500 and inserts into the valve plate channel, the accurate connection between the support plate 500 and the valve body is realized, improving the overall strength and stability of the entire valve body structure. At the same time, finally removing the side positioning plate 140 facilitates the reuse of the tooling and reduces the production cost.

[0046] The welding method of the double-end equal-diameter skeleton based on the valve body structure provided by the present invention, compared with the prior art, by horizontally arranging the positioning main body 100, using the positioning support plate 110 at the bottom to carry the first valve body 200, and with the help of the positioning column and the positioning arc surface 121, the central hole of the first valve body 200 is accurately positioned. When the flange end of the first valve body 200 abuts against the upper end surface of the positioning support plate 110 and the inner wall of the central hole fits the positioning arc surface 121, its center position is precisely fixed, laying a solid foundation for all subsequent assembly and welding processes. Similarly, the second valve body 300 is positioned by the same principle, ensuring that the double-end valve bodies maintain extremely high concentricity from the very beginning, avoiding problems such as unbalanced valve body structure and poor sealing caused by positioning deviation of the valve bodies, and greatly improving the overall stability and reliability of the valve body. The central positioning plate 130 and the side positioning plate 140, the positioning planes of the two are aligned and parallel to the side wall of the valve body, creating conditions for positioning the gate plate 400. The gate plate 400 is strictly limited in its horizontal position by the tight fit of its inner wall with the double positioning planes. Whether it is the spacing between the gate plates 400 or their perpendicularity relative to the valve body, they can be accurately controlled, effectively preventing the gate plates 400 from being skewed or misaligned after welding, ensuring the machining accuracy of the gate plates 400, and further ensuring the smoothness and regularity of the internal flow channel of the valve, improving the fluid transmission performance of the valve. By making the positioning step 143 of the side positioning plate 140 closely fit the outside of the support plate 500, and cooperating with the design that the side positioning plate 140 passes through the strip-shaped hole of the support plate 500 and inserts into the valve plate channel, the support plate 500 is firmly fixed from multiple angles. This makes the support plate 500 not only accurately positioned during welding, but also form a stable connection structure with the valve body and the gate plate 400, enhancing the rigidity of the entire valve body skeleton and providing strong support for the stable operation of the valve under high-pressure and high-strength working conditions.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A welding device for a double-ended equal-diameter frame based on a valve body structure, characterized in that: The invention comprises a positioning body (100), wherein a positioning support plate (110) is arranged at an outer end of the positioning body (100), and a concentric positioning column (120) is arranged at an inner end of the positioning body (100). The concentric positioning column (120) axially penetrates into two symmetrically arranged valve body center holes, and the outer periphery of the concentric positioning column (120) is provided with a positioning arc surface (121), and the positioning arc surface (121) circumferentially fits the inner wall of the center hole of the two valve bodies, and a middle positioning plate (130) is arranged on the concentric positioning column (120), and the middle positioning plate (130) is located in the middle between the two valve bodies, and the thickness of the middle positioning plate (130) is the same as the thickness of the gate plate (400), and the two sides of the middle positioning plate (130) are respectively provided with middle positioning planes (131), and the middle positioning planes (131) fit the middle part of the inner wall of the valve plate on the same side.

2. The double-end equal-diameter frame welding device based on the valve body structure according to claim 1 is characterized in that: It also includes a side positioning plate (140), which is located on either side between the two valve bodies. The thickness of the side positioning plate (140) is the same as the thickness of the gate plate (400). Both sides of the side positioning plate (140) are respectively provided with side positioning planes (141), and the side positioning planes (141) are attached to one side of the inner wall of the valve plate on the same side.

3. The double-end equal-diameter frame welding device based on the valve body structure according to claim 2 is characterized in that: An external plate (142) is provided at one end of the side positioning plate (140) away from the middle positioning plate (130), and the thickness of the external plate (142) is greater than the thickness of the side positioning plate (140). A positioning step (143) is formed between the external plate (142) and the side positioning plate (140), and the positioning step (143) is in contact with the outer wall of the opposite end of the valve body.

4. The double-end equal-diameter frame welding device based on the valve body structure according to claim 1 is characterized in that: The positioning body (100) is a cylinder, and a weight-reducing hole (150) is provided axially through the cylinder.

5. The double-end equal-diameter frame welding device based on the valve body structure according to claim 4 is characterized in that: An escape groove (160) is provided in the circumferential direction of the outer wall of the cylinder, and the escape groove (160) is located between the positioning support plate (110) and the concentric positioning column (120).

6. The welding device of the double-end equal-diameter frame based on the valve body structure according to claim 1 is characterized in that: A positioning groove is axially provided at one end of the concentric positioning column (120) away from the positioning support plate (110), and the axis of the middle positioning plate (130) is clamped in the positioning groove. The positioning groove is used to limit the axial displacement and circumferential rotation of the middle positioning plate (130).

7. The double-end equal-diameter frame welding device based on the valve body structure according to claim 6, characterized in that: The positioning groove comprises a transverse positioning groove (122) and two longitudinal positioning grooves (123); the transverse positioning groove (122) is transversely opened at one end of the concentric positioning column (120) away from the positioning support plate (110); the two longitudinal positioning grooves (123) are respectively arranged at two ends of the transverse positioning groove (122) and are connected to the transverse positioning groove (122); the middle positioning plate (130) is inserted into the transverse positioning groove (122); the two ends of the middle positioning plate (130) are respectively provided with positioning end plates (132) bent to one side; the two positioning end plates (132) are both inserted into the two longitudinal positioning grooves (123) in a conformal manner.

8. A welding method for a double-ended equal-diameter frame based on a valve body structure, characterized in that: A welding device for a double-end equal-diameter frame based on a valve body structure as described in any one of claims 3 to 7 is used, comprising the following steps: S1: The positioning body (100) is placed horizontally, the positioning support plate (110) is located at the bottom of the positioning body (100), and the first valve body (200) is mounted on the positioning column from top to bottom until the flange end of the first valve body (200) abuts against the upper end surface of the positioning support plate (110), and the inner wall of the center hole of the first valve body (200) fits the positioning arc surface (121); S2: placing the middle positioning plate (130) on the concentric positioning column (120), and placing the side positioning plate (140) horizontally on one side of the upper end surface of the first valve body (200), so that the middle positioning plane (131) and the side positioning plane (141) are in the same plane and parallel to the side wall of the first valve body (200); S3: placing two gate plates (400) on both sides of the upper end surface of the first valve body (200), respectively, with the inner walls of the gate plates (400) being in contact with the middle positioning plane (131) and the side positioning plane (141) at the same time, and fixing the two gate plates (400) and welding them; S4: Remove the middle positioning plate (130) and the side positioning plate (140), and relatively snap the second valve body (300) onto the two gate plates (400) on the upper end surface of the first valve body (200). The second valve body (300) is sleeved onto the positioning column with the inner wall of the center hole in contact with the positioning arc surface (121). The first valve body (200) and the second valve body (300) are fixed and the second valve body (300) is welded. S5: A support plate (500) is vertically placed on the same side of the first valve body (200) and the second valve body (300), and the side positioning plate (140) passes through the strip hole of the support plate (500) from the outside to the inside and is inserted into the valve plate channel between the two valve plates. The side positioning plate (140) is used to position the step (143) to press against the outside of the support plate (500) and weld the support plate (500), and finally remove the side positioning plate (140).

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