Welding positioning tool for vent valve assembly

Abstract

The invention relates to the technical field of vent valve welding and positioning, and discloses a vent valve assembly welding and positioning tool which comprises a main body, and a V-shaped block is slidably connected to the top of the main body. Due to the fact that the bottoms of the two inclined plates make contact with each other, the arc-shaped pieces cannot rotate freely, one arc-shaped piece drives the inclined plate to rotate and extrudes the other inclined plate through the inclined plate, the inclined plates generate radial extrusion force on the valve body, the two arc-shaped pieces generate wrapping type clamping force on the valve body, and therefore the valve body is clamped. The valve body is clamped more tightly along with the rotating trend in the welding process, so that the conditions that the valve body axially rotates in the welding process and angular deviation is generated between the valve body and the flange are reduced, and the coaxiality and the positioning accuracy during welding of a valve assembly are improved.

Description

Technical Field

[0001] This invention relates to the field of vent valve welding positioning technology, specifically a welding positioning fixture for a vent valve assembly. Background Technology

[0002] Vent valves are important control components that play a crucial role in many fields. By precisely controlling the flow and pressure of gas, vent valves help maintain stable system operation and protect equipment from damage. When welding the vent valve assembly, a lateral clamp is typically used to vertically press the cross-section of the valve flange, and a V-block or lateral locating pin is installed at the bottom of the valve body to ensure the coaxiality of the flange and valve body, the fit of the cross-section, and the accuracy of the position of each component. Since the positioning of the vent valve during welding relies on the clamp to hold and tighten the flange and make the valve body in close contact with the V-block, the subsequent welding of other components can easily cause the valve body to rotate axially under the torque generated during the rotational welding process. This can lead to positional offset and angular deviation between the valve body and the flange, affecting the coaxiality and positioning accuracy of the valve assembly during welding. Summary of the Invention

[0003] The purpose of this invention is to provide a welding positioning fixture for a vent valve assembly to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a welding positioning fixture for a vent valve assembly, comprising a main body, a V-shaped block slidably connected to the top of the main body, and further comprising: The movable mechanism is installed on the top of the main body to ensure the stability of the valve assembly during welding. The deformation mechanism is installed on the side wall of the moving mechanism to prevent the valve assembly components from jumping.

[0005] Furthermore, the main body includes: The drive assembly is installed on the top of the main body and is used to drive the subsequent structure to move in order to clamp the valve body. A clamping assembly is mounted on the side wall of the drive assembly to ensure accurate positioning of the valve assembly during welding.

[0006] Furthermore, the active mechanism includes two movable plates positioned at the top of the main body, and the active mechanism also includes: The sliding assembly is installed on the side wall of the movable plate to prevent the valve body from shifting during welding. The elastic component is installed on the side wall of the sliding component.

[0007] Furthermore, the deformation mechanism includes a limiting frame disposed at the top of the main body, a sliding groove being formed at the top of the limiting frame, and an elastic sheet being fixedly connected to the bottom inner wall of the sliding groove. The deformation mechanism also includes: Auxiliary components are installed inside the sliding groove to ensure their stability during valve body welding; The bending component is mounted on the side wall of the auxiliary component.

[0008] Furthermore, the drive assembly includes an electric actuator bolted to the top of the main body, the output end of the electric actuator being bolted to a connecting plate, and the side wall of the connecting plate being bolted to two connecting shafts; The clamping assembly includes a clamping block rotatably connected to the end of the connecting shaft away from the connecting plate, and a center plate rotatably connected to the side wall of the clamping block; A blocking block is rotatably connected between the two center plates, and the blocking block is bolted to the top of the main body.

[0009] Furthermore, the movable plate is rotatably connected to the side wall of the clamping block; The sliding assembly includes a fixed plate rotatably connected to the end of the movable plate away from the clamping block, and an arc-shaped frame is fixedly connected to the end of the fixed plate away from the movable plate; The inside of the arc-shaped frame is connected to an arc-shaped piece, and the bottom of the arc-shaped piece is rotatably connected to an inclined plate; Several rubber sheets are fixedly connected to the side wall of the arc-shaped piece.

[0010] Furthermore, the elastic component includes a sliding frame fixedly connected to the side of the arc-shaped frame near the electric actuator, and a linear spring is fixedly connected between the two sliding frames; One of the sliding frames is fixedly connected to a tilting spring on the side near the curved frame. The side wall of the tilting spring is provided with two elastic strips. The end of the elastic strip near the sliding frame is fixedly connected to the side wall of the curved frame. An inclined block is provided at the top of the first elastic strip, and the inclined block is fixedly connected to the side wall of the arc frame. The two first elastic strips are in contact with each other.

[0011] Furthermore, the auxiliary component includes a sliding frame fixedly connected to the end of the tilting spring away from the sliding frame, and the sliding frame is slidably connected inside the sliding groove; The top of the sliding frame is fixedly connected to an elastic strip two. Three positioning rods are fixedly connected to the side of the elastic strip two near the electric push rod. In the initial state, the sliding frame will be blocked by the elastic sheet. The sliding frame is a telescopic structure.

[0012] Furthermore, the bending assembly includes a bending piece slidably connected to the outer surface of the three positioning rods, the bending piece being made of an elastic material; The curved plate is rotatably connected to several trapezoidal plates on the side near the elastic strip two. The trapezoidal plates are arranged in groups of three at equal angles. A torsion spring is fixedly connected between the top of the trapezoidal plate and the curved plate.

[0013] Furthermore, an auxiliary spring is fixedly connected to the side wall of the elastic strip 2 on the outer surface of the central positioning rod. The end of the auxiliary spring away from the elastic strip 2 is fixedly connected to the side wall of the bending piece. In the initial state, the side wall of the inclined block contacts the side wall of the bending piece and the side wall of the elastic strip 2 and pushes the two ends of the bending piece and the elastic strip 2 to cause them to expand and deform.

[0014] The present invention has the following beneficial effects: 1. In this invention, because the bottoms of the two inclined plates are in contact with each other, the arc-shaped pieces cannot rotate freely. The rotation of one of the arc-shaped pieces causes the inclined plate to squeeze the other inclined plate, resulting in radial extrusion force on the valve body. This causes the two arc-shaped pieces to create a covering clamping force on the valve body. As a result, the more the valve body tends to rotate during the welding process, the tighter it is held. This reduces the axial rotation of the valve body during welding and the angular deviation from the flange, thereby improving the coaxiality and positioning accuracy of the valve assembly during welding.

[0015] 2. In this invention, when the sliding frame retracts, the retracted sliding frame will drive the elastic strip II and the curved piece to slide downwards. At this time, the curved piece and the elastic strip II, which are close together and cover the surface of the valve body, will generate a downward pulling force on the valve body. By pulling the valve body downwards, the upward lifting force generated on the valve body when the two arc-shaped frames slide close to each other along the surface of the valve body can be reduced, further ensuring the stability of the valve body welding position, and improving the accuracy and efficiency of subsequent welding.

[0016] 3. This invention, through the change of state of the two elastic strips, enables the curved plate and the second elastic strip to be guided along the inclined surface of one side wall of the elastic strip during the sliding process. This ensures that the curved plate and the second elastic strip maintain smoothness during the sliding process and maintains stability by slowly returning to their original position when the inclined spring elastically contracts. This reduces the vibration of the valve body caused by the curved plate and the second elastic strip pulling the valve body, ensures the tightness of the valve body and flange welding process, and improves the positioning effect of valve assembly parts.

[0017] 4. In this invention, the bending piece will first be squeezed by one side wall of the deformed elastic strip and move closer to the direction of the second elastic strip. At this time, the second elastic strip will squeeze the side walls of multiple trapezoidal plates, so that the trapezoidal plates are tightly attached to the valve body surface and generate a large clamping force on the valve body. This ensures that when the bending piece and the second elastic strip pull the valve body, there will be no relative sliding on the valve body surface, and ensures the pulling strength and stability of the bending piece and the second elastic strip when pulling the valve body.

[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the driving component of the present invention; Figure 4 This is a schematic diagram of the active mechanism of the present invention; Figure 5 This is an exploded view of the sliding component of the present invention; Figure 6 This is an exploded view of the bending component of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point B in the middle; Figure 8 This is a schematic diagram of the overall structure of the present invention after movement; Figure 9 This is a partial cross-sectional view of the auxiliary mechanism of the present invention from below.

[0021] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Main body; 11. Drive assembly; 111. Electric actuator; 112. Connecting plate; 113. Connecting shaft; 12. Clamping assembly; 121. Pressure clamp block; 122. Center plate; 123. Blocking block; 2. Movable mechanism; 201. Movable plate; 21. Sliding assembly; 211. Fixed plate; 212. Arc frame; 213. Arc piece; 214. Inclined plate; 22. Elastic assembly; 221. Sliding frame; 222. Inclined spring; 223. Elastic strip one; 224. Inclined block; 3. Deformation mechanism; 301. Limiting frame; 302. Elastic piece; 31. Auxiliary assembly; 311. Sliding frame; 312. Elastic strip two; 313. Positioning rod; 32. Bending assembly; 321. Bending piece; 322. Trapezoidal plate. Detailed Implementation

[0022] 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.

[0023] Please see Figures 1-9 As shown, the present invention is a welding positioning fixture for a vent valve assembly, including a main body 1, a V-shaped block slidably connected to the top of the main body 1, and further comprising: Movable mechanism 2 is installed on the top of the main body 1 to ensure the stability of the valve assembly during welding. Deformation mechanism 3 is installed on the side wall of movable mechanism 2 to prevent valve assembly components from jumping.

[0024] Entity 1 includes: Drive assembly 11 is installed on the top of the main body 1 and is used to drive the subsequent structure to move so as to clamp the valve body. Clamping assembly 12 is mounted on the side wall of drive assembly 11 to ensure accurate positioning of the valve assembly during welding.

[0025] The active mechanism 2 includes two movable plates 201 disposed on the top of the main body 1, and the active mechanism 2 also includes: The sliding component 21 is installed on the side wall of the movable plate 201 to prevent the valve body from shifting during welding. The elastic component 22 is installed on the side wall of the sliding component 21.

[0026] Deformation mechanism 3 includes a limiting frame 301 disposed on the top of the main body 1. A sliding groove is provided on the top of the limiting frame 301, and an elastic sheet 302 is fixedly connected to the bottom inner wall of the sliding groove. Deformation mechanism 3 also includes: Auxiliary component 31 is installed inside the sliding groove to ensure its position is stable during the welding of the valve body; The bending component 32 is mounted on the side wall of the auxiliary component 31.

[0027] The drive assembly 11 includes an electric actuator 111 bolted to the top of the main body 1. The output end of the electric actuator 111 is bolted to a connecting plate 112. Two connecting shafts 113 are bolted to the side wall of the connecting plate 112. The clamping assembly 12 includes a clamping block 121 rotatably connected to one end of the connecting shaft 113 away from the connecting plate 112, and a center plate 122 is rotatably connected to the side wall of the clamping block 121. A blocking block 123 is rotatably connected between the two center plates 122. The blocking block 123 is bolted to the top of the main body 1. First, the flange on the valve assembly is placed on the side wall of the blocking block 123, the valve body is placed on the V-block, and the valve body is inserted into the flange. Then, the electric actuator 111 is started. When the electric actuator 111 is working, it will drive the clamping block 121 to rotate relative to the blocking block 123 through the connecting plate 112 and the two connecting shafts 113 on the side wall.

[0028] The movable plate 201 is rotatably connected to the side wall of the clamping block 121; The sliding assembly 21 includes a fixed plate 211 rotatably connected to the end of the movable plate 201 away from the clamping block 121, and an arc-shaped frame 212 is fixedly connected to the end of the fixed plate 211 away from the movable plate 201. An arc-shaped piece 213 is slidably connected inside the arc-shaped frame 212, and an inclined plate 214 is rotatably connected to the bottom of the arc-shaped piece 213; Among them, several rubber sheets are fixedly connected to the side wall of the arc-shaped piece 213.

[0029] The elastic component 22 includes a sliding frame 221 fixedly connected to the side of the arc frame 212 near the electric push rod 111, and a linear spring is fixedly connected between the two sliding frames 221; One of the sliding frames 221 is fixedly connected to a tilting spring 222 on the side near the arc frame 212. The side wall of the tilting spring 222 is provided with two elastic strips 223. The end of the elastic strip 223 near the sliding frame 221 is fixedly connected to the side wall of the arc frame 212. An inclined block 224 is provided at the top of the elastic strip 223. The inclined block 224 is fixedly connected to the side wall of the arc frame 212. The two elastic strips 223 are in contact with each other. When the two arc frames 212 approach each other, the bottom ends of the two inclined plates 214 will contact each other. At this time, the inner wall of the arc plate 213 will be in close contact with the arc of the valve body surface through the rubber sheet, and the valve body and the flange will be initially coaxially positioned. During the subsequent rotation welding process, when the torque attempts to rotate the valve body, the rotation of the valve body will drive the arc plate 213 to slide in the arc frame 212 through the rubber sheet.

[0030] Auxiliary component 31 includes a sliding frame 311 fixedly connected to the end of the tilting spring 222 away from the sliding frame 221, and the sliding frame 311 is slidably connected inside the sliding groove; The top of the sliding frame 311 is fixedly connected to an elastic strip 312. Three positioning rods 313 are fixedly connected to the side of the elastic strip 312 near the electric push rod 111. In the initial state, the sliding frame 311 will be blocked by the elastic plate 302. The sliding frame 311 is a telescopic structure. The curved frame 212 will drive the inclined block 224 to separate it from the side wall of the curved plate 321. At this time, the curved plate 321 and the elastic strip 312 will move closer to each other and cover the surface of the valve body under their own elasticity. When the sliding frame 221 slides with the curved frame 212, the sliding frame 311 will be stretched by the inclined spring 222.

[0031] The bending assembly 32 includes a bending piece 321 that is slidably connected to the outer surface of the three positioning rods 313. The bending piece 321 is made of an elastic material. The curved piece 321 is rotatably connected to several trapezoidal plates 322 on the side near the elastic strip 312. The trapezoidal plates 322 are arranged in groups of three at equal angles. A torsion spring is fixedly connected between the top of the trapezoidal plate 322 and the curved plate 321. When the sliding frame 311 retracts, the retracted sliding frame 311 will drive the elastic strip 312 and the curved plate 321 to slide downward. At this time, the curved plate 321 and the elastic strip 312, which are close to each other and cover the surface of the valve body, will generate a downward pulling force on the valve body.

[0032] An auxiliary spring is fixedly connected to the side wall of the elastic strip 312 on the outer surface of the central positioning rod 313. The end of the auxiliary spring away from the elastic strip 312 is fixedly connected to the side wall of the bending plate 321. In the initial state, the side wall of the inclined block 224 contacts the side walls of the bending plate 321 and the elastic strip 312 and pushes the two ends of the bending plate 321 and the elastic strip 312 to cause them to expand. When the bending plate 321 and the elastic strip 312 separate from the side wall of the inclined block 224 and cover the surface of the valve body under their own elasticity, the bending plate 321 will drive multiple trapezoidal plates 322 to cover the surface of the valve body simultaneously.

[0033] In use, first place the flange on the valve assembly onto the side wall of the blocking block 123, place the valve body onto the V-block, and insert the valve body into the flange. Then, start the electric actuator 111. When the electric actuator 111 is working, it will drive the clamping block 121 to rotate relative to the blocking block 123 through the connecting plate 112 and the two connecting shafts 113 on the side wall. When the clamping block 121 rotates, it will clamp the flange placed on the side wall of the blocking block 123 through the center plate 122, thereby ensuring the positioning of the flange and its internal valve body before welding.

[0034] When the two clamping blocks 121 rotate relative to each other to clamp the flange of the valve assembly, the relative rotation of the two clamping blocks 121 will cause the fixed plate 211 and the arc-shaped frame 212 to move closer to each other synchronously through the movable plate 201. As the clamping blocks 121 rotate, the two arc-shaped frames 212 can slide along the surface of the valve body during the process of moving closer to each other. At the same time, when the two arc-shaped frames 212 move closer to each other, the bottom ends of the two inclined plates 214 will contact each other. At this time, the inner wall of the arc-shaped piece 213 will make close contact with the curvature of the valve body surface through the rubber sheet, and achieve the initial coaxial positioning of the valve body and the flange. During the subsequent rotation welding process, when the torque attempts to rotate the valve body, the rotation of the valve body will... The rubber sheet drives the arc-shaped piece 213 to slide within the arc-shaped frame 212. Since the bottoms of the two inclined plates 214 are in contact with each other, the arc-shaped piece 213 cannot rotate freely. The rotation of one of the arc-shaped pieces 213 and the inclined plate 214 will squeeze the other inclined plate 214 through the inclined plate 214, so that the inclined plate 214 generates radial extrusion force on the valve body. This causes the two arc-shaped pieces 213 to generate a covering clamping force on the valve body. As the valve body tends to rotate during the welding process, it is held tighter. This reduces the axial rotation of the valve body during the welding process and the angular deviation from the flange, thereby improving the coaxiality and positioning accuracy of the valve assembly during welding.

[0035] When the two clamping blocks 121 rotate, causing the two arc-shaped frames 212 to move closer to each other and slide along the valve body surface, the sliding of the two arc-shaped frames 212 on the valve body surface will cause the sliding frame 221 to slide synchronously. When the arc-shaped frames 212 slide on the valve body surface, they will cause the tilting block 224 to separate from the side wall of the bending plate 321. At this time, the bending plate 321 and the elastic strip 312 will move closer to each other and cover the valve body surface under their own elasticity. When the sliding frame 221 slides with the arc-shaped frames 212, it will stretch the sliding frame 311 through the tilting spring 222. Since the sliding frame 311 is blocked by the side wall of the elastic plate 302 in the initial state, the arc-shaped frames 212 will cause the tilting spring 222 to be stretched by the sliding frame 221. 22 is in a stretched state between the sliding frame 221 and the sliding bracket 311, accumulating elastic contraction potential energy. As the inclined spring 222 continues to stretch, the sliding bracket 311 can overcome the elastic block of the elastic plate 302 and slide inside the sliding groove. Since the inclined spring 222 is inclined in the top area of ​​the sliding frame 221 and the sliding bracket 311, when the inclined spring 222 elastically contracts, it will drive the top of the sliding bracket 311 to contract downward. When the sliding bracket 311 contracts, the contracted sliding bracket 311 will drive the elastic strip 312 and the curved plate 321 to slide downward. At this time, the curved plate 321 and the elastic strip 312, which are close to each other and cover the surface of the valve body, will generate a downward pulling force on the valve body, exhibiting Figure 8As shown in position G, by pulling the valve body downward, the upward lifting force on the valve body generated when the two arc-shaped frames 212 slide close to each other along the valve body surface can be reduced, further ensuring the stability of the valve body welding position, while improving the accuracy and efficiency of subsequent welding.

[0036] When the two curved frames 212 approach each other, the ends of the two elastic strips 223 will press against each other. At this time, the front ends of the two elastic strips 223 will approach each other, presenting a state that is narrow at the front and wide at the back. Figure 8 As shown in state H, the transition between the states of the two elastic strips 223 allows the bent plate 321 and the elastic strip 312 to be guided along the inclined surface of the side wall of the elastic strip 223 during sliding. This ensures that the bent plate 321 and the elastic strip 312 maintain smoothness during sliding and maintain stability by slowly returning to their original position when the inclined spring 222 elastically contracts. This reduces the vibration of the valve body caused by the bent plate 321 and the elastic strip 312 pulling the valve body, ensuring the tightness of the valve body and flange welding process and improving the positioning effect of the valve assembly parts.

[0037] When the bending plate 321 and the elastic strip 312 separate from the side wall of the inclined block 224 and wrap around the valve body surface under their own elasticity, the bending plate 321 will drive multiple trapezoidal plates 322 to simultaneously wrap around the valve body surface. At this time, the trapezoidal plates 322 will rotate under the compression of the valve body, causing the torsion spring to accumulate elastic force. At this time, the trapezoidal plates 322 will be tightly attached to the valve body surface. Subsequently, when the bending plate 321 and the elastic strip 312 slide along the valve body surface, the bending plate 321 will first deform and then... Under the pressure of the side wall of the first elastic strip 223, it moves closer to the second elastic strip 312. At this time, the second elastic strip 312 will press the side walls of multiple trapezoidal plates 322, so that the trapezoidal plates 322 are tightly attached to the surface of the valve body and generate a large clamping force on the valve body. This ensures that when the bending plate 321 and the second elastic strip 312 pull the valve body, there will be no relative sliding on the surface of the valve body, and ensures the tensile strength and stability of the bending plate 321 and the second elastic strip 312 when pulling the valve body.

[0038] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A welding positioning fixture for a vent valve assembly, comprising a main body (1), wherein a V-shaped block is slidably connected to the top of the main body (1), characterized in that, Also includes: The active mechanism (2) is installed on the top of the main body (1) to ensure the stability of its position when welding the valve assembly; Deformation mechanism (3) is installed on the side wall of the movable mechanism (2) to prevent the valve assembly components from jumping.

2. The welding positioning fixture for a vent valve assembly according to claim 1, characterized in that: The main body (1) includes: A drive assembly (11) is installed on the top of the main body (1) and is used to drive the subsequent structure to move so as to clamp the valve body; A clamping assembly (12) is mounted on the side wall of the drive assembly (11) to ensure accurate positioning of the valve assembly during welding.

3. The welding positioning fixture for a vent valve assembly according to claim 2, characterized in that: The movable mechanism (2) includes two movable plates (201) disposed on the top of the main body (1), and the movable mechanism (2) further includes: A sliding assembly (21) is installed on the side wall of the movable plate (201) to prevent displacement of the valve body during welding. An elastic component (22) is mounted on the side wall of the sliding component (21).

4. The welding positioning fixture for a vent valve assembly according to claim 3, characterized in that: The deformation mechanism (3) includes a limiting frame (301) disposed on the top of the main body (1), the top of the limiting frame (301) having a sliding groove, and an elastic sheet (302) fixedly connected to the bottom inner wall of the sliding groove. The deformation mechanism (3) also includes: Auxiliary component (31) is installed inside the sliding groove to ensure its position is stable when welding the valve body; A bending assembly (32) is mounted on the side wall of the auxiliary assembly (31).

5. The welding positioning fixture for a vent valve assembly according to claim 4, characterized in that: The drive assembly (11) includes an electric actuator (111) bolted to the top of the main body (1), the output end of the electric actuator (111) is bolted to a connecting plate (112), and the side wall of the connecting plate (112) is bolted to two connecting shafts (113). The clamping assembly (12) includes a clamping block (121) rotatably connected to one end of the connecting shaft (113) away from the connecting plate (112), and a center plate (122) is rotatably connected to the side wall of the clamping block (121). A blocking block (123) is rotatably connected between the two center plates (122), and the blocking block (123) is bolted to the top of the body (1).

6. The welding positioning fixture for a vent valve assembly according to claim 5, characterized in that: The movable plate (201) is rotatably connected to the side wall of the clamping block (121); The sliding assembly (21) includes a fixed plate (211) rotatably connected to the end of the movable plate (201) away from the clamping block (121), and an arc frame (212) is fixedly connected to the end of the fixed plate (211) away from the movable plate (201). The arc-shaped frame (212) is slidably connected to an arc-shaped piece (213), and the bottom of the arc-shaped piece (213) is rotatably connected to an inclined plate (214). Among them, the side wall of the arc-shaped piece (213) is fixedly connected with several rubber pieces.

7. The welding positioning fixture for a vent valve assembly according to claim 6, characterized in that: The elastic component (22) includes a sliding frame (221) fixedly connected to the side of the arc frame (212) near the electric push rod (111), and a linear spring is fixedly connected between the two sliding frames (221); One of the sliding frames (221) is fixedly connected to a tilting spring (222) on the side near the arc frame (212). The side wall of the tilting spring (222) is provided with two elastic strips (223). One end of the elastic strip (223) near the sliding frame (221) is fixedly connected to the side wall of the arc frame (212). An inclined block (224) is provided at the top of the elastic strip (223), and the inclined block (224) is fixedly connected to the side wall of the arc frame (212).

8. The welding positioning fixture for a vent valve assembly according to claim 7, characterized in that: The auxiliary component (31) includes a sliding frame (311) fixedly connected to one end of the tilting spring (222) away from the sliding frame (221), and the sliding frame (311) is slidably connected inside the sliding groove; The top of the sliding frame (311) is fixedly connected to an elastic strip (312), and three positioning rods (313) are fixedly connected to the side of the elastic strip (312) near the electric push rod (111).

9. The welding positioning fixture for a vent valve assembly according to claim 8, characterized in that: The bending assembly (32) includes a bending piece (321) slidably connected to the outer surface of three positioning rods (313), the bending piece (321) being made of an elastic material; The curved piece (321) is rotatably connected to a number of trapezoidal plates (322) on the side near the elastic strip (312), and the trapezoidal plates (322) are arranged in groups of three at equal angles. A torsion spring is fixedly connected between the top of the trapezoidal plate (322) and the curved plate (321).

10. The welding positioning fixture for a vent valve assembly according to claim 8, characterized in that: An auxiliary spring is fixedly connected to the side wall of the elastic strip two (312) on the outer surface of the positioning rod (313) in the middle. The end of the auxiliary spring away from the elastic strip two (312) is fixedly connected to the side wall of the bending piece (321).

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