A welding device for producing a stop valve

Abstract

The application discloses a stop valve production welding device, and relates to the technical field of stop valve production welding, which comprises a rotating table, the rotating table comprises a fixed base and a rotating base rotatably arranged on the fixed base, and further comprises a plurality of welding clamp mechanisms which are fixedly arranged on the rotating base in a circumferential direction and sequentially pass through a feeding positioning station, an inspection station, a welding station and a cooling and discharging station while rotating with the rotating base, wherein the welding station is provided with a surrounding welding mechanism, an auxiliary mechanism and a micro-vibration motor, and the surrounding welding mechanism is used for surrounding heating of the butt joint of a valve body and a pipe fitting through a reciprocating swing mode. The device has the advantages that a prefabricated filler ring is adopted and is subjected to 360-degree melting and filling; uniform temperature field is provided through swing heating, so that the liquid filler maintains good fluidity; micro-vibration auxiliary cooperation makes the filler gap more sufficient and the weld structure more compact, and the mechanical properties and sealing performance of the joint are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of welding technology for gate valve production, and more particularly to a welding apparatus for gate valve production. Background Technology

[0002] In the valve manufacturing industry, gate valves are widely used opening and closing devices in fluid pipeline systems. The connection quality between the valve body and pipe fittings directly affects the valve's performance and safety. Rotary flame brazing machines are ideal for mass production scenarios such as small gate valves and piping. This type of equipment uses a rotary table to sequentially transport workpieces to loading, welding, cooling, and unloading stations, improving production efficiency and reducing the operator's workload.

[0003] Existing welding equipment for gate valve production, namely rotary flame brazing machines, often uses a single-point wire feeding method for adding brazing filler metal in practical applications. The wire feeding mechanism delivers the brazing filler wire from a single point to the edge of the weld. The molten brazing filler metal needs to flow a considerable distance circumferentially to fill the entire butt joint gap. This places extremely stringent requirements on the precision of the assembly gap and the uniformity of the heating temperature. At the same time, it is difficult to precisely control the amount of brazing filler metal used, and fluctuations in the amount can lead to inconsistent weld fullness.

[0004] Secondly, the filler metal fills the gap mainly through capillary action. However, for longer flow paths or when there are minor obstructions (such as oxides or impurities), capillary action alone is insufficient to drive the filler metal to fill the entire area deep within the gap.

[0005] Furthermore, the fixed welding torch heating method leads to uneven heating. The area directly facing the torch is heated to an excessively high temperature, while the area away from the flame is underheated. This temperature difference effect causes the liquid brazing filler metal to preferentially flow to the high-temperature side, resulting in a "misaligned weld" defect where brazing filler metal accumulates on one side of the weld and the gap is not filled on the other side. This seriously affects the sealing performance and mechanical properties of the weld.

[0006] Therefore, in order to improve the quality consistency of the welding between the gate valve and the pipe fitting and the mechanical properties of the joint, the present invention provides a gate valve production welding device. Summary of the Invention

[0007] The purpose of this invention is to solve the problems existing in the prior art by proposing a welding device for the production of gate valves.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a gate valve production welding device, which uses flame brazing and brazing filler rings to weld and connect the valve body and pipe fittings, including a turntable, the turntable including a fixed base and a rotating base rotatably mounted on the fixed base, and further including: multiple welding fixture mechanisms, which are circumferentially fixedly mounted on the rotating base and rotate with the rotating base to pass through the loading and positioning station, the inspection station, the welding station and the cooling and unloading station in sequence.

[0009] The welding fixture mechanism includes a positioning seat for positioning the valve body, a clamping part for clamping the pipe fitting to be welded, and a supporting part for supporting the prefabricated brazing ring.

[0010] The welding station is equipped with a surround welding mechanism, an auxiliary mechanism, and a micro-vibration motor.

[0011] The circumferential welding mechanism heats the joint between the valve body and the pipe fitting by reciprocating oscillation. After preheating, the auxiliary mechanism drives the support part to release the brazing ring, causing the brazing ring to fall to the joint. After continuous heating, the brazing ring melts and fills the gap at the joint, and the micro-vibration motor generates micro-vibration to assist in filling the gap.

[0012] In the aforementioned gate valve production welding device, the welding fixture mechanism further includes an L-shaped fixture seat fixedly installed on a rotating seat, with a rubber pad placed between the L-shaped fixture seat and the rotating seat; a positioning seat is fixedly installed on the top of the horizontal section of the L-shaped fixture seat, and a positioning groove for positioning the valve body is opened on the top wall of the positioning seat.

[0013] In the aforementioned gate valve production welding device, an L-shaped fixture seat is provided with a clamping part, which includes a U-shaped plate fixedly installed on the top of the vertical section of the L-shaped fixture seat.

[0014] In the above-mentioned gate valve production welding device, both ends of the U-shaped plate are fixed with fixing blocks, and clamping parts are elastically slidably connected to the fixing blocks. The two clamping parts are symmetrically distributed for clamping pipe fittings, and wedges are installed on the side walls of the clamping parts.

[0015] In the above-mentioned gate valve production welding device, the clamping part is provided with a support part, which includes support members that are elastically and symmetrically slidably connected to the top walls of both ends of the U-shaped plate. The two support members are used to support the brazing ring, so that the brazing ring is sleeved on the outside of the pipe fitting in the initial state and is located directly above the joint between the pipe fitting and the valve body.

[0016] In the aforementioned gate valve production welding device, a force-bearing component is fixedly connected to the side wall of the support component, and a guide groove is provided on the force-bearing component; a pusher component is elastically slidably connected to the top of the U-shaped plate.

[0017] In the aforementioned gate valve production welding device, the end of the pusher near the support is trapezoidal in shape and is used to cooperate with the guide groove, while the end of the pusher away from the support is L-shaped and is used to cooperate with the auxiliary mechanism of the welding station.

[0018] In the aforementioned gate valve production welding device, the circumferential welding mechanism includes a mounting housing fixed on a fixed base, a gear rotatably connected to the mounting housing, an arc-shaped guide rail provided on the mounting housing, a circumferential frame slidably connected to the arc-shaped guide rail, and an arc-shaped rack meshing with the gear on the side wall of the circumferential frame; the circumferential frame is C-shaped, and two welding torches are symmetrically mounted on it.

[0019] In the aforementioned gate valve production welding device, the auxiliary mechanism includes a support base fixedly installed in the middle of the fixed base, and a drive plate slidably connected to the top wall of the support base. The drive plate is used to abut against the L-shaped end of the pusher and drive the release of the brazing ring.

[0020] In the aforementioned gate valve production welding device, the driving mechanism includes an electric push rod and an L-shaped pusher fixedly installed at the top of the output end of the electric push rod. The top wall of the vertical section of the L-shaped pusher is formed by two inclined surfaces that are arrow-shaped and adapted to the wedge block.

[0021] Compared with existing technologies, the advantages of this invention are as follows: by using a pre-made brazing ring and performing 360° melting and filling; and by providing a uniform temperature field through oscillating heating, the liquid brazing metal maintains good fluidity; and with the assistance of micro-vibration, the brazing metal fills the gaps more fully, the weld structure is more compact, and the mechanical properties and sealing performance of the joint are significantly improved.

[0022] 1. Abandoning the traditional single-point wire feeding method, a pre-formed annular brazing filler metal is adopted, which melts simultaneously from 360°. The filler metal fills from all sides into the weld at the same time, which greatly shortens the flow distance and makes the filling more reliable. Moreover, the amount used is precise and controllable, which not only avoids the waste of brazing filler metal, but also ensures the consistency of weld fullness.

[0023] 2. The circumferential welding mechanism drives the circumferential frame to swing back and forth along the arc-shaped guide rail through gears and arc-shaped racks, which drives the two welding torches to perform uniform and reciprocating circumferential heating on the joint, eliminating local overheating and underheating, and effectively avoiding the temperature difference problem between the opposite side and the back side caused by heating with a fixed welding torch.

[0024] 3. During the melting and filling of the brazing filler ring, the micro-vibration motor drives the valve body to generate high-frequency micro-vibration. This vibration is transmitted to the liquid brazing filler, effectively promoting the wetting, spreading and expulsion of the brazing filler, significantly reducing the porosity defects inside the weld, and improving the tensile strength and density of the joint. Attached Figure Description

[0025] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

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

[0027] Figure 2This is a structural diagram of the valve body and pipe fittings;

[0028] Figure 3 A partial structural diagram of the welding fixture mechanism and the surrounding welding mechanism at the welding station;

[0029] Figure 4 This is an exploded view of the welding fixture mechanism.

[0030] Figure 5 for Figure 4 Another structural diagram from a different perspective;

[0031] Figure 6 for Figure 1 Schematic diagram of the structure at point A;

[0032] Figure 7 for Figure 1 Schematic diagram of the structure at point B;

[0033] Figure 8 This is a schematic diagram of a surround welding mechanism.

[0034] In the diagram: 100, valve body; 200, pipe fitting; 300, brazing ring; 1, turntable; 11, fixed seat; 12, rotating seat; 2, welding fixture mechanism; 21, L-shaped fixture seat; 22, positioning seat; 23, clamping part; 231, U-shaped plate; 232, clamping component; 233, wedge; 24, support part; 241, support component; 242, force-bearing component; 243, pushing component; 3, encircling welding mechanism; 31, gear; 32, encircling frame; 33, arc-shaped rack; 34, welding torch; 4, auxiliary mechanism; 41, drive plate; 5, micro-vibration motor; 6, drive mechanism; 61, L-shaped pushing component. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Reference Figure 1 , Figure 2 and Figure 4 A welding apparatus for manufacturing gate valves is disclosed, which employs flame brazing and uses a brazing filler ring 300 to weld the valve body 100 and pipe fitting 200 together. This apparatus is mainly suitable for small-diameter gate valves, where the valve body 100 and pipe fitting 200 are connected by socket welding. For example, if the inner diameter of the socket of the valve body 100 is 34.5 mm, then the outer diameter of the pipe fitting 200 is 33.4 mm to 34 mm.

[0037] The gate valve production welding device includes a turntable 1, which mainly consists of a fixed base 11 and a rotating base 12 rotatably mounted on the fixed base 11. Multiple welding fixture mechanisms 2 are uniformly fixedly mounted on the rotating base 12 circumferentially. When the rotating base 12 rotates, these welding fixture mechanisms 2 sequentially pass through a loading and positioning station, an inspection station, a welding station, and a cooling and unloading station arranged around it. In this embodiment, the loading and positioning station is located on the right side, the inspection station is located at the rear, the welding station is located on the left side, and the cooling and unloading station is located at the front.

[0038] Reference Figures 1 to 7 The welding fixture mechanism 2 includes an L-shaped fixture seat 21, a positioning seat 22, a clamping part 23, and a supporting part 24.

[0039] Specifically, the L-shaped clamp seat 21 is fixedly installed on the rotating seat 12, and a rubber pad is placed between the two to absorb vibration. The L-shaped clamp seat 21 has a horizontal section and a vertical section. The positioning seat 22 is fixedly installed on the top of the horizontal section of the L-shaped clamp seat 21, and a positioning groove is opened on its top wall. The positioning groove is adapted to the bottom shape of the valve body 100 and is used to position the valve body 100.

[0040] A clamping part 23 is disposed at the top of the vertical section of the L-shaped clamping base 21 and is used to clamp the pipe fitting 200 to be welded. The clamping part 23 includes a U-shaped plate 231, which is fixedly installed at the top of the vertical section of the L-shaped clamping base 21. A fixing block is fixed at both ends of the U-shaped plate 231, and a clamping element 232 is slidably connected to each fixing block through an elastic element. The two clamping elements 232 are symmetrically distributed, and the side closest to each other is semi-circular, forming a receiving cavity together. A wedge block 233 is also fixedly installed on the side wall of each clamping element 232.

[0041] A support portion 24 is disposed on the clamping portion 23 and is used to support the pre-fabricated brazing ring 300. The support portion 24 includes two support members 241, which are symmetrically slidably connected to the top walls of both ends of the U-shaped plate 231 via elastic members. The side of the two support members 241 that is close to each other is semi-circular, and its cross-section is L-shaped. The horizontal surface of the L-shape is used to support the brazing ring 300 from below. In the initial state, the brazing ring 300 is sleeved on the outside of the pipe fitting 200 and is supported by the support members 241 directly above the joint between the pipe fitting 200 and the valve body 100.

[0042] A force-bearing member 242 is also fixedly connected to the side wall of the support member 241, and a guide groove is provided on the force-bearing member 242. The pusher 243 is slidably connected to the top of the U-shaped plate 231 through an elastic member. The end of the pusher 243 near the support member 241 is trapezoidal, and the trapezoidal end is slidably engaged with the guide groove; the end of the pusher 243 away from the support member 241 is L-shaped.

[0043] It should be noted that all of the above elastic components are high-temperature resistant springs.

[0044] At the loading and positioning station, a drive mechanism 6 is installed on the fixed base 11. The drive mechanism 6 includes an electric push rod and an L-shaped pusher 61 fixedly installed on the top of the output end of the electric push rod. The top wall of the vertical section of the L-shaped pusher 61 is formed by two inclined surfaces in an arrow shape, which is adapted to the wedge 233 on the clamping member 232. When the electric push rod is lifted upward, the inclined surface of the L-shaped pusher 61 interacts with the inclined surface of the wedge 233, thereby achieving avoidance before loading and resetting to clamp and position the tube 200 after loading.

[0045] Reference Figure 1 , Figure 2 , Figure 3 and Figure 8 The welding station is equipped with a surround welding mechanism 3, an auxiliary mechanism 4, and a micro-vibration motor 5.

[0046] Specifically, the circumferential welding mechanism 3 includes a mounting housing fixed to a fixed base 11. A gear 31 is rotatably connected to the mounting housing. An arc-shaped guide rail is provided on the top wall of the mounting housing, and a C-shaped circumferential frame 32 is slidably connected to the arc-shaped guide rail. The side wall of the circumferential frame 32 is fitted with an arc-shaped rack 33 that meshes with the gear 31. Two welding torches 34 are symmetrically mounted on the circumferential frame 32.

[0047] The mounting housing is also equipped with a forward and reverse drive motor (not shown in the figure). During operation, the forward and reverse drive motor drives the gear 31 to rotate back and forth. The gear 31 drives the circling frame 32 to swing back and forth along the arc-shaped guide rail through the arc-shaped rack 33, thereby driving the two welding torches 34 to perform uniform and reciprocating circling heating on the joint between the valve body 100 and the pipe fitting 200.

[0048] Reference Figure 1 and Figure 7 The auxiliary mechanism 4 includes a support base fixedly installed in the middle of the fixed base 11. The top wall of the support base is slidably connected to a drive plate 41 via an electric slider. The position of the drive plate 41 corresponds to the L-shaped end of the pusher 243, and is used to abut against the L-shaped end of the pusher 243 when needed.

[0049] Reference Figure 1 , Figure 3 , Figure 4 and Figure 8 The micro-vibration motor 5 is fixedly installed on the fixed base 11 and located directly below the welding fixture mechanism 2. Its vibration head can touch the bottom of the L-shaped fixture base 21 during the welding process.

[0050] It should be noted that the moving parts near the above-mentioned welding station, such as the pusher 243, the support 241, the surrounding frame 32, and various sliding surfaces, are in a high-temperature radiation environment for a long time. Therefore, high-temperature resistant materials are selected to avoid high-temperature expansion and jamming.

[0051] The specific operating steps of the welding device for producing this gate valve are as follows: Loading and positioning stage: At the loading and positioning station, the operator or robot places the valve body 100 into the positioning slot of the positioning seat 22. The top of the electric push rod extends upwards, driving the L-shaped pusher 61 upwards. This, in conjunction with the wedge block 233, drives the clamping members 232 to move away from each other before loading. The pipe fitting 200 is inserted between the two clamping members 232, and the pre-made brazing ring 300 is placed on the pipe fitting 200, which is then supported by the support member 241 directly above the joint. Subsequently, the top of the electric push rod moves downwards to reset, and the clamping members 232 are elastically reset. After loading is completed, the pipe fitting 200 is clamped.

[0052] It is important to note that the prefabrication requirements for the brazing filler ring are that its inner diameter is 0.1mm to 0.2mm larger than the outer diameter of the fitting, and its thickness is 0.8mm to 1.2mm, to ensure free sliding; the material should be copper-phosphorus based or silver-based. Using prefabricated ring-shaped brazing filler allows for simultaneous melting at 360°, with precise and controllable dosage.

[0053] Inspection Phase: The rotary seat 12 rotates, delivering the clamped workpiece to the inspection station. A non-contact detector (such as a laser sensor or industrial camera, not shown in the diagram) is installed here to detect whether the assembly gap between the valve body 100 and the pipe fitting 200 meets welding standards. If it fails to meet the standards, the system alarms and rejects the workpiece.

[0054] Welding stage: Qualified workpieces enter the welding station. The welding stage includes three parts: preheating, material cutting and filling, and micro-vibration assistance.

[0055] Preheating: The circumferential welding mechanism 3 is activated, and the two welding torches 34, driven by the C-shaped circumferential frame 32, swing back and forth along the arc-shaped guide rail to uniformly preheat the joint and eliminate local overheating and underheating. At this time, the micro-vibration motor 5 has not yet been activated, and the brazing filler ring 300 is still supported by the support member 241, away from the high-temperature zone, to avoid premature melting.

[0056] It is important to note that an infrared thermometer can be added to the welding station to monitor the temperature at the joint in real time. The drive of auxiliary mechanism 4 should be interlocked with the temperature measurement signal, and should only be activated and released when the temperature of the detection area is within the set range (e.g., 650℃-750℃). If the temperature does not meet the standard, an alarm should be triggered and the operation of the station should be stopped.

[0057] Material feeding and filling: After preheating, the drive plate 41 of the auxiliary mechanism 4 moves horizontally, contacting the L-shaped end of the pusher 243, pushing the pusher 243 away from the support 241. The trapezoidal end of the pusher 243 drives the two support 241s to overcome elastic force and move away from each other through the guide groove on the force-bearing member 242. At this time, the brazing filler ring 300 loses its support and falls precisely to the fully preheated joint under the action of gravity. The welding torch 34 continues to heat, causing the brazing filler ring 300 to melt rapidly and evenly 360°, filling the joint gap under capillary action. The brazing filler fills from all sides simultaneously inward, greatly shortening the flow distance and making the filling more reliable.

[0058] Micro-vibration assistance: Simultaneously with the melting and filling of the brazing filler metal ring 300, the micro-vibration motor 5 starts, its vibrating head contacting the L-shaped clamp seat 21 upwards. The vibration force is transmitted to the valve body 100 via the positioning seat 22, causing the valve body 100 to generate high-frequency micro-vibration. This vibration is transmitted through the valve body 100 to the liquid brazing filler metal, effectively promoting its wetting, spreading, and air bubble removal, significantly reducing porosity defects inside the weld, and improving the filling quality and joint strength. The micro-vibration motor 5 stops after 3 to 5 seconds of vibration.

[0059] It should be noted that the high-frequency micro-vibration of the valve body 100 has a vibration frequency of 50Hz to 200Hz and an amplitude of 10μm to 50μm; a rubber pad is placed between the L-shaped clamp seat 21 and the rotating seat 12 to prevent resonance of the rotating seat 12. Vibration starts 0.5 to 1 second after the brazing filler ring melts to prevent interference with positioning if started too early and loss of auxiliary gap-filling effect if started too late; the vibration duration is 3 to 5 seconds, matching the solidification time of the brazing filler to avoid disturbing the solidification process.

[0060] After welding is completed, the welding torch 34 stops heating, and the surrounding frame 32 drives the welding torch 34 back to the initial position of the arc-shaped guide rail.

[0061] Unloading stage: Rotary seat 12 rotates again, sending the welded workpiece to the cooling and unloading station. Spray heads are provided here to cool the workpiece by spraying water (existing mature equipment, not shown in the figure). After the workpiece cools down to a safe temperature, the operator or robot arm removes the welded shut-off valve.

[0062] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0063] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A welding device for producing a stop valve, which uses a flame brazing method and uses a filler ring to weld butt joint of a valve body and a pipe, comprising a rotary table, the rotary table comprising a fixed base and a rotating base rotatably installed on the fixed base, characterized in that, Also includes: Multiple welding fixtures are circumferentially fixed on the rotating base and rotate with the rotating base, passing sequentially through the loading and positioning station, inspection station, welding station and cooling and unloading station; The welding fixture mechanism includes a positioning seat for positioning the valve body, a clamping part for clamping the pipe fitting to be welded, and a supporting part for supporting the prefabricated brazing ring. The welding station is equipped with a surround welding mechanism, an auxiliary mechanism, and a micro-vibration motor; The welding fixture mechanism also includes an L-shaped fixture seat fixedly installed on the rotating seat, with a rubber pad between the L-shaped fixture seat and the rotating seat; a positioning seat is fixedly installed on the top of the horizontal section of the L-shaped fixture seat, and a positioning groove for positioning the valve body is opened on the top wall of the positioning seat. The L-shaped clamping base is provided with a clamping part, which includes a U-shaped plate fixedly installed on the top of the vertical section of the L-shaped clamping base; The clamping part is provided with a support part, which includes support members that are elastically and symmetrically slidably connected to the top walls of both ends of the U-shaped plate. The two support members are used to support the brazing ring, so that the brazing ring is sleeved on the outside of the pipe and located directly above the joint between the pipe and the valve body in the initial state. The side wall of the support member is fixedly connected to a force-bearing member, and a guide groove is provided on the force-bearing member; the top of the U-shaped plate is elastically slidably connected to a pushing member; The end of the pusher near the support is trapezoidal in shape and is used to cooperate with the guide groove. The end of the pusher away from the support is L-shaped and is used to cooperate with the auxiliary mechanism of the welding station. The auxiliary mechanism includes a support base fixedly installed in the middle of the fixed base, and a drive plate slidably connected to the top wall of the support base. The drive plate is used to abut against the L-shaped end of the pusher to drive the release of the brazing ring. The circumferential welding mechanism heats the joint between the valve body and the pipe fitting by reciprocating oscillation. After preheating, the auxiliary mechanism drives the support part to release the brazing ring, causing the brazing ring to fall to the joint. After continuous heating, the brazing ring melts and fills the gap at the joint, and the micro-vibration motor generates micro-vibration to assist in filling the gap.

2. The welding apparatus for producing a gate valve according to claim 1, characterized in that, Both ends of the U-shaped plate are fixed with fixing blocks, and clamping members are elastically slidably connected to the fixing blocks. The two clamping members are symmetrically distributed for clamping the pipe fittings, and wedges are installed on the side walls of the clamping members.

3. The welding apparatus for producing a gate valve according to claim 1, characterized in that, The circumferential welding mechanism includes a mounting housing fixed on a fixed base, a gear rotatably connected to the mounting housing, an arc-shaped guide rail on the mounting housing, a circumferential frame slidably connected to the arc-shaped guide rail, and an arc-shaped rack meshing with the gear on the side wall of the circumferential frame; the circumferential frame is C-shaped, and two welding torches are symmetrically mounted on it.

4. The gate valve production welding apparatus according to claim 2, characterized in that, It also includes a drive mechanism, which includes an electric push rod and an L-shaped pusher fixedly installed on the top of the output end of the electric push rod. The top wall of the vertical section of the L-shaped pusher is formed by two inclined surfaces that are arrow-shaped and adapted to the wedge block.

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