Welding device for irregular appearance of stainless steel water meter shell

Abstract

The invention discloses a welding device for the irregular appearance of a stainless steel water meter shell, and relates to the field of water meter welding. The chuck is provided with a pre-positioning assembly used for flexibly fixing a weldment and a first power assembly used for driving the clamping jaws to move. The pre-positioning assembly comprises a plurality of positioning plates, the positioning plates are elastically arranged on the chuck, and when the first power assembly drives the clamping jaws to move towards a weldment, force is stored on the positioning plates through the clamping jaws. According to the welding device for the irregular appearance of the stainless steel water meter shell, the positioning plates are elastically arranged on the chuck, and when a weldment is placed, the multiple positioning plates avoid and then elastically clamp the weldment, so that the position of the weldment is flexibly fixed, and the weldment can be located in the center positions of the multiple clamping jaws all the time.

Description

Technical Field

[0001] The invention relates to the field of water meter welding, and in particular to a welding device for an irregular-shaped stainless steel water meter case. Background Art

[0002] As is well known, a water meter is an instrument used to measure water usage, typically installed on water supply pipes in homes or commercial buildings. It consists of a meter case and a measuring instrument. The case is made of either copper or stainless steel, each with its own advantages and disadvantages. When manufacturing a stainless steel water meter case, the various components are individually produced using molds or cutting techniques, and then welded together. During welding, a clamping assembly is required to secure the case in place.

[0003] For example, the Chinese patent document entitled "Welding Fixture" with authorization announcement number CN212858310U and announcement date 2021-04-02 includes a base, a fixing assembly, a support member, a clamping assembly, and a limiting sleeve; the fixing assembly is arranged on the base and is used to fix the lower part of the workpiece to be welded; the support member is fixed to the base; the limiting sleeve is provided with a sleeve hole, the hole wall of the sleeve hole is used to position the upper and lower parts of the workpiece to be welded located therein; the clamping assembly includes a first mounting member slidably arranged on the support member and a pressure rod connected to the first mounting member; the pressure rod is used to slide with the sleeve hole and press the upper part onto the lower part. In the welding fixture provided by the utility model, the shape of the sleeve hole of the limiting sleeve is consistent with the outer shape of the workpiece to be welded, which can accurately position the upper and lower parts at one time, improve the positioning accuracy of the upper and lower parts of the workpiece to be welded, avoid inaccurate positioning affecting the welding quality, and also improve production efficiency; the pressure rod continues to press the upper and lower parts until welding is completed, avoiding misalignment of the upper and lower parts during the welding process and ensuring welding quality.

[0004] The shortcomings of the above-mentioned existing technologies are that when fixing the lower part, the weldment is put on the claws, and then the claws are moved along the radial direction of the chuck to clamp it from the internal space of the weldment. When placing the weldment, it is placed directly on the claws, which can easily make the weldment unstable and easily cause the weldment to fly during the subsequent movement of the claws. Summary of the Invention

[0005] The purpose of the present invention is to provide a welding device for irregular-shaped stainless steel water meter cases to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A welding device for an irregularly shaped stainless steel water meter case, comprising a chuck for placing a weldment, a plurality of claws slidably provided on the chuck, a pre-positioning assembly for flexibly fixing the weldment, and a first power assembly for driving the claws to move;

[0008] The pre-positioning assembly includes a plurality of positioning plates, each of which is elastically arranged on the chuck. When the first power assembly drives the clamping claw to move toward the weldment, the clamping claw accumulates force on the positioning plate.

[0009] In the above-mentioned welding device for the irregular shape of a stainless steel water meter case, an abutment plate is provided on the chuck, and a first spring is provided between the abutment plate and the positioning plate.

[0010] In the above-mentioned welding device for an irregular-shaped stainless steel water meter case, an inclined surface is provided on the positioning plate.

[0011] In the above-mentioned welding device for irregular-shaped stainless steel water meter cases, the first power assembly includes a cylinder and a transmission barrel connected to the output end of the cylinder, and a connecting rod is provided between each of the claws and the transmission barrel.

[0012] The above-mentioned welding device for irregular-shaped stainless steel water meter cases has a first tooth plate on the clamping claw, a second tooth plate on the abutting plate, and a gear rotatably provided on the chuck. The first tooth plate and the second tooth plate are both engaged with the gear.

[0013] The above-mentioned welding device for irregular-shaped stainless steel water meter cases has a groove on the positioning plate, a slide groove on the inner wall of the groove, a slider sliding inside the slide groove, a pressure plate rotatably arranged on the slider, and a first torsion spring arranged between the pressure plate and the slider.

[0014] In the above-mentioned welding device for an irregular-shaped stainless steel water meter case, a second spring is provided between the slider and the slide groove.

[0015] In the above-mentioned welding device for an irregular-shaped stainless steel water meter case, a first limiting portion is provided on the slider, and the first limiting portion is located on the rotation stroke of the pressure plate.

[0016] In the above-mentioned welding device for an irregular-shaped stainless steel water meter case, a second limiting portion is elastically provided on the slider;

[0017] The second limiting portion has a first position abutting against the pressure plate and a second position away from the pressure plate. A second power component for driving the pressure plate to switch between the first position and the second position is provided inside the sliding groove.

[0018] The above-mentioned welding device for the irregular shape of the stainless steel water meter case, the second power component includes an abutment block, a wedge-shaped portion is provided on the second limiting portion, the wedge-shaped portion is located on the movement stroke of the abutment block, and a third spring is provided between the second limiting portion and the slider.

[0019] In the above technical solution, the present invention provides a welding device for an irregularly shaped stainless steel water meter case. By elastically providing positioning plates on the chuck, when placing the weldment, multiple positioning plates avoid and then elastically clamp the weldment, so as to flexibly fix the position of the weldment and ensure that the weldment can always be located at the center of multiple claws;

[0020] Moreover, when the claw moves toward the weldment, it will drive the clamping plate to accumulate force, thereby providing a clamping effect on the outer surface of the weldment, so that the inner and outer surfaces of the weldment can be clamped at the same time, thereby improving the stability of the weldment clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the internal structure provided by an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of a partial cross-sectional structure provided by an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of the overall structure of the positioning plate provided in an embodiment of the present invention;

[0026] Figure 5 A schematic diagram of the overall structure of a slider provided in an embodiment of the present invention;

[0027] Figure 6 An exploded schematic diagram of a slider provided in an embodiment of the present invention;

[0028] Figure 7 A schematic diagram of the overall structure of a pry bar and a clamping claw provided in another embodiment of the present invention;

[0029] Figure 8 A schematic diagram of the abutment process between the abutment plate and the pry bar provided in another embodiment of the present invention;

[0030] Figure 9 for Figure 4 A magnified schematic diagram of the local structure at point A.

[0031] Description of reference numerals:

[0032] 1. Chuck; 2. Clamping claw; 3. Positioning plate; 4. Water meter housing; 5. Flange; 6. Abutment plate; 7. First spring; 8. Radial groove; 9. Cylinder; 10. Transmission barrel; 11. Connecting rod; 12. Slide bar; 13. First tooth plate; 14. Second tooth plate; 15. Gear; 16. Rotating frame; 17. Groove; 18. Slide groove; 19. Slider; 20. Pressing plate; 21. Second spring; 22. First limiting part; 23. Second limiting part; 24. Movable groove; 25. Abutment block; 26. Wedge-shaped part; 27. Third spring; 28. Pry bar; 29. Lifting part; 30. Avoidance groove; 31. Vertical section; 32. Horizontal section; 33. Through hole. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] In the description of the present invention, it is to be understood that Figure 8 The vertical section 31 is on the right relative to the horizontal section 32, and vice versa. Figure 8 The direction of rotation of the middle lifting portion 29 toward the pressure plate 20 is clockwise, and vice versa is counterclockwise. The terms "center", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying 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 orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0035] Reference Figure 1-9 An embodiment of the present invention provides a welding device for an irregular-shaped stainless steel water meter case, comprising a chuck 1 for placing a weldment (i.e., a water meter case 4), a plurality of claws 2 being slidably provided on the chuck 1, the chuck 1 being provided with a pre-positioning component for flexibly fixing the weldment and a first power component for driving the claws 2 to move; the pre-positioning component comprises a plurality of positioning plates 3, each of the positioning plates 3 being elastically provided on the chuck 1, and when the first power component drives the claws 2 to move toward the weldment, the claws 2 accumulate force on the positioning plates 3.

[0036] Specifically, the water meter case 4 is an internal hollow structure for installing measuring instruments. It is provided with three openings, one of which is used to install the water meter. The outer surface of the opening is provided with a flange portion 5, and the other two are used to communicate with the water pipe. During production, half of the water meter case 4 is first manufactured by mold casting or other methods, and then the two halves of the water meter case 4 are welded from the middle to obtain a complete water meter case 4. The specific welding method is: first pre-weld the position to be welded by spot welding, and then place the pre-welded water meter case 4 on the chuck 1, and fix the chuck 1 by controlling the claws 2 to move along the radial direction of the chuck 1, and then automatically weld by a laser welding machine. This is the existing technology and will not be repeated. One of the core innovations of the embodiment of the present invention is that a pre-positioning component is provided on the chuck 1, which includes a plurality of positioning plates 3 elastically arranged on the chuck 1. The positioning plates 3 are preferably arc-shaped plates. The positions of the plurality of positioning plates 3 are The positions of the plurality of clamping claws 2 are arranged in a one-to-one correspondence with the positions of the plurality of clamping claws 2. A radial groove 8 is provided on the chuck 1. The clamping claws 2 and the positioning plate 3 are both slidably connected to the radial groove 8. The first power component can be two groups of electric push rods. The two groups of electric push rods control the clamping claws 2 and the positioning plate 3 respectively. The purpose of such a setting is that when placing the weldment, placing the weldment in the middle of the plurality of positioning plates 3 will cause the plurality of positioning plates 3 to avoid synchronously, and accumulate force on the elastic member between the positioning plate 3 and the chuck 1, and pre-clamp the weldment through the elastic force of the elastic member, so as to flexibly fix the position of the weldment and enable the weldment to always be located in the center position of the plurality of clamping claws 2; and while the first power component controls the clamping claws 2 to move toward the weldment to clamp the water meter case 4 from the inside, the first power component accumulates force on the elastic member inside the positioning plate 3, thereby providing a clamping effect on the outer peripheral surface of the weldment, so that the inner and outer surfaces of the weldment can be clamped at the same time, so as to improve the stability of the weldment clamping.

[0037] Preferably, an abutment plate 6 is provided on the chuck 1, and a first spring 7 is provided between the abutment plate 6 and the positioning plate 3. Specifically, the cross section of the abutment plate 6 is approximately U-shaped, and it is also slidably arranged in the radial groove 8, and is located at the end of the radial groove 8 away from the central axis of the chuck 1. One end of the first spring 7 is fixedly connected to the positioning plate 3, and the other end is fixedly connected to the abutment plate 6. The effect of such a setting is that while the first power component controls the movement of the claw 2, it synchronously drives the abutment plate 6 to move in the direction of the positioning plate 3, during which the first spring 7 is squeezed and force is stored on it. The force of the abutment plate 6 is transmitted to the positioning plate 3 through the first spring 7, so that the force of the positioning plate 3 on the outer peripheral surface of the water meter case 4 gradually increases, thereby achieving clamping of the outside of the water meter case 4.

[0038] Furthermore, the positioning plate 3 is provided with an inclined surface. Specifically, the inclined surface, i.e., the end of the upper surface of the positioning plate 3 closer to the central axis of the chuck 1, is lower than the end farther from the central axis of the chuck 1. This arrangement allows the water meter housing 4 to slide toward the central axis of the chuck 1 under the guidance of the inclined surface when the opening of the water meter housing 4 abuts the upper surface of the positioning plate 3. Ultimately, the water meter housing 4 is positioned at the center of the plurality of positioning plates 3, facilitating placement of the water meter housing 4.

[0039] Preferably, the first power assembly includes a cylinder 9 and a transmission barrel 10 connected to the output end of the cylinder 9, and a connecting rod 11 is provided between each of the clamping jaws 2 and the transmission barrel 10. Specifically, a base is provided below the chuck 1, the cylinder 9 is disposed within the base, the transmission barrel 10 is cylindrical, a slide bar 12 is coaxially arranged on the chuck 1, and the transmission barrel 10 is slidably connected to the slide bar 12. A plurality of connecting rods 11 are provided, and a fixed shaft is provided on each of the transmission barrel 10 and the clamping jaws 2. The ends of each connecting rod 11 are rotatably connected to the fixed shafts of the clamping jaws 2 and the transmission barrel 10, respectively. This arrangement is used to control the extension of the output end of the cylinder 9 when clamping the water meter case 4, thereby driving the transmission barrel 10 to slide toward the slide bar 12, which in turn pushes the connecting rod 11 to move and rotate. The multiple connecting rods 11 push the multiple clamping jaws 2 in a direction away from the central axis of the chuck 1. In this way, the multiple clamping jaws 2 are controlled to move synchronously by a single cylinder 9, so that the weldment is clamped from the inside.

[0040] As an alternative solution for the above-mentioned electric push rod to store force on the first spring 7, it is preferred that a first tooth plate 13 is provided on the clamping claw 2, a second tooth plate 14 is provided on the abutting plate 6, and a gear 15 is rotatably provided on the chuck 1, and the first tooth plate 13 and the second tooth plate 14 are both engaged with the gear 15. Specifically, the first tooth plate 13 is provided on the lower surface of the clamping claw 2, the second tooth plate 14 is provided on the lower surface of the abutting plate 6, and a rotating frame 16 is provided on the inner top wall of the chuck 1. The gear 15 is rotatably connected to the rotating frame 16, and the first tooth plate 13 and the second tooth plate 14 are simultaneously engaged with the gear 15. The effect of such a setting is that when the output end of the cylinder 9 is extended and retracted to drive the clamping claw 2 to slide along the radial groove 8, it will drive the first tooth plate 13 to move synchronously, because the first tooth plate 13 is engaged with the gear 15, thereby driving the gear 15 on the rotating frame 1 6 rotates, and because the gear 15 is engaged with the second tooth plate 14, the second tooth plate 14 and the abutment plate 6 are driven to move synchronously in the opposite direction to the claw 2, that is, when the claw 2 moves in the direction away from the central axis of the chuck 1, the abutment plate 6 is driven to move in the direction close to the central axis of the chuck 1, thereby achieving the clamping of the inner and outer sides of the water meter case 4. When the claw 2 moves in the direction close to the central axis of the chuck 1, the abutment plate 6 is driven to move in the direction away from the central axis of the chuck 1, thereby achieving the loosening of the inner and outer sides of the water meter case 4.

[0041] Furthermore, a groove 17 is provided on the positioning plate 3, a sliding groove 18 is provided on the inner wall of the groove 17, a slider 19 is provided inside the sliding groove 18 for sliding movement, a pressure plate 20 is provided on the slider 19 for rotation, and a first torsion spring (not shown) is provided between the pressure plate 20 and the slider 19. Specifically, the groove 17 is provided on the upper surface of the positioning plate 3. With respect to a single groove 17, there are two sliding grooves 18 and two sliders 19. The two sliders 19 are respectively slidably connected to the two sliding grooves 18. The slider 19 is a block-shaped structure, and a limiting structure is provided between the slider 19 and the sliding groove 18 to prevent the two from separating from each other (such as a sliding matching structure of a limiting block and a limiting groove). The cross section of the pressure plate 20 is L-shaped, and a rotating shaft is provided on both sides thereof. The two rotating shafts are respectively rotated with the two sliders 19 The elastic force of the first torsion spring makes the pressure plate 20 tend to rotate clockwise, and a locking structure such as a pin can be provided between the abutment plate 6 and the slider 19 (that is, when the pin is inserted into the rotating shaft and the slider 19 at the same time, the rotation angle of the pressure plate 20 is fixed), and the pressure plate 20 is located on the movement stroke of the abutment plate 6. The effect of such a setting is that when the abutment plate 6 moves toward the positioning plate 3 to store force on the first spring 7, the end of the abutment plate 6 will move toward the direction of the pressure plate 20, and The abutment plate 6 abuts against the surface of the pressure plate 20. At this time, the pressure plate 20 is in an inclined state under the action of the locking structure, and the end of the pressure plate 20 does not protrude from the upper surface of the positioning plate 3. At this time, the movement of the abutment plate 6 will drive the pressure plate 20 to move horizontally. When the end of the pressure plate 20 moves above the flange 5, the effect of the locking structure is released. At this time, the abutment plate 6 continues to move, causing the pressure plate 20 to rotate counterclockwise, so that the end of the pressure plate 20 abuts against the upper surface of the flange 5, so as to lock the water meter case 4 in the vertical direction. Passive limiting is performed in the direction to avoid the water meter case 4 from flying during the clamping process, and the first torsion spring is charged. When welding is completed, the abutment plate 6 is controlled to move in the reverse direction, which will cause the abutment plate 6 to move away from the pressure plate 20. At this time, the elastic force of the first torsion spring is released, causing the pressure plate 20 to rotate in the reverse direction, thereby causing the pressure plate 20 to move away from the flange portion 5 to release the limiting effect of the pressure plate 20 on the water meter case 4, and then the angle of the pressure plate 20 is fixed again through the locking structure to achieve the reset of the vertical angle of the pressure plate 20.

[0042] Furthermore, a second spring 21 is provided between the slider 19 and the chute 18. Specifically, one end of the second spring 21 is fixed to the slider 19, and the other end is fixed to the side wall of the chute 18. This arrangement is used to store force in the second spring 21 during the process of the abutment plate 6 and the pressure plate 20 abutting to drive the pressure plate 20 to slide horizontally along the direction of the chute 18. When the abutment plate 6 and the pressure plate 20 move away from each other, the elastic force of the second spring 21 is released to restore the pressure plate 20 to its horizontal position.

[0043] As an alternative to the aforementioned pin-fixed vertical angle of the pressure plate 20, a first limiting portion 22 is provided on the slider 19. The first limiting portion 22 is located within the rotational travel of the pressure plate 20. Specifically, the first limiting portion 22 is an arc-shaped protruding structure on the slider 19. The first limiting portion 22 is located within the clockwise rotational travel of the pressure plate 20. This configuration serves to limit the clockwise rotational travel of the pressure plate 20. The elastic force of the first torsion spring causes the pressure plate 20 to engage with the first limiting portion 22, thereby maintaining the pressure plate 20 in an inclined state.

[0044] Furthermore, a second limiting portion 23 is elastically provided on the slider 19; the second limiting portion 23 has a first position abutting against the pressure plate 20 and a second position away from the pressure plate 20, and a second power component for driving the pressure plate 20 to switch between the first position and the second position is provided inside the slide groove 18. Specifically, the second limiting portion 23 is also an arc-shaped protruding structure on the slider 19. The second limiting portion 23 is located on the counterclockwise rotation stroke of the pressure plate 20. It cooperates with the first limiting portion 22 to fix the vertical angle of the pressure plate 20. A movable groove 24 is provided inside the slider 19. The second limiting portion 23 is slidably connected to the movable groove 24. The second power component can also be an existing reciprocating drive component such as an electric push rod. The effect of such a setting is that when the water meter case 4 is not clamped, the second limiting portion 23 is controlled to be in the first position by the second power component. When the second limiting portion 23 is in the first position, it protrudes from the surface of the slider 19 and abuts against the surface of the pressure plate 20, so that the angle of the pressure plate 20 can be fixed. When the first power component drives the abutment plate 6 When moving toward the water meter case 4, when the abutment plate 6 abuts against the pressure plate 20, it will drive the pressure plate 20 to move toward the water meter case 4. When the end of the pressure plate 20 moves to above the flange 5, the second limiting part 23 is controlled by the second power component to switch from the first position to the second position. At this time, the pressure plate 20 is unlocked. When the abutment plate 6 continues to move, the pressure plate 20 will rotate counterclockwise, so that the end of the pressure plate 20 abuts against the flange 5 to limit the water meter case 4. After welding is completed, the abutment plate 6 is controlled to move away from the pressure plate 20. At this time, the pressure plate 20 automatically resets under the action of the second spring 21 and the elastic force of the first torsion spring. At this time, the second limiting part 23 is controlled to switch from the second position to the first position to lock the vertical angle of the pressure plate 20 again.

[0045] As an alternative solution for the above-mentioned electric push rod to control the active switching of the pressure plate 20 between the first position and the second position, the second power component includes an abutment block 25, a wedge-shaped portion 26 is provided on the second limiting portion 23, the wedge-shaped portion 26 is located on the movement stroke of the abutment block 25, and a third spring 27 is provided between the second limiting portion 23 and the slider 19. Specifically, the abutment block 25 is a protruding structure of the left inner wall of the slide groove 18, the wedge-shaped portion 26 is arranged on the side of the second limiting portion 23, and extends through the side wall of the movable groove 24 to the slide groove 18, the abutment block 25 is located on the movement stroke of the wedge-shaped portion 26, one end of the third spring 27 is fixed to the inner wall of the movable groove 24, and the other end is fixed to the second limiting portion 23. The effect of such a setting is that when the abutment plate 6 drives the pressure plate 20 to move toward the water meter case 4, the wedge surface of the wedge-shaped portion 26 will abut against the abutment block 25, and drive the wedge-shaped portion 26 and the second limiting portion 23 to slide toward the inside of the movable groove 24, and store force on the third spring 27, so that the second limiting portion 23 is passively cut from the first position When it switches to the second position (at this time, the end of the pressure plate 20 is located above the flange portion 5), the pressure plate 20 will be driven to rotate counterclockwise during the subsequent movement of the abutment plate 6 to achieve the limitation of the water meter case 4. After the welding is completed, the abutment plate 6 is controlled to move away from the pressure plate 20, which will also drive the wedge-shaped portion 26 and the abutment block 25 away. Under the action of the second spring 21 and the first torsion spring force, the pressure plate 20 will be driven to automatically reset. When the side wall of the pressure plate 20 is away from the second limiting portion 23, the elastic force of the third spring 27 is released, which will drive the second limiting portion 23 to slide toward the outside of the movable groove 24, so that the second limiting portion 23 is passively switched from the second position to the first position to lock the vertical angle of the pressure plate 20 again.

[0046] As another embodiment of the present invention, a pry bar 28 is rotatably provided on the pressure plate 20, and a second torsion spring (not shown) is provided between the pry bar 28 and the pressure plate 20. The pry bar 28 is located on the movement stroke of the abutment plate 6, and a lifting portion 29 is provided on the pry bar 28. The spring 33 of the second torsion spring is smaller than the spring 21 of the second spring 21, and the lifting portion 29 is located at the end of the horizontal section 32 of the pry bar 28, and the lifting portion 29 is provided with an inclined surface. In this embodiment, a through hole 33 is provided on the claw 2 for the lifting portion 29 to pass through. The effect of such a setting is that when the abutment plate 6 moves toward the direction of the central axis of the chuck 1, the end of the abutment plate 6 will preferentially abut the right side of the vertical section 31 of the pry bar 28. Since the elastic force of the second torsion spring is smaller than the elastic force of the second spring 21, the pry bar 28 will first rotate counterclockwise around the connecting shaft, causing the horizontal section 32 to rotate from a horizontal state to an inclined state. When the support plate 6 is moved to the top of the flange 5, the pressure plate 20 is unlocked and rotated counterclockwise under the action of the abutment plate 6. At this time, the abutment plate 6 slides along the surface of the pressure plate 20. When the abutment plate 6 is away from the end of the vertical section 31, the elastic force of the second torsion spring is released, thereby driving the horizontal section 32 to rotate clockwise. At this time, the inner circumference of the water meter case 4 is located on the movement range of the lifting part 29. When welding is completed, the abutment plate 6 is controlled to move in the opposite direction, so that its end abuts against the left side of the end of the vertical section 31 (as shown in FIG. Figure 8 As shown), the pry bar 28, the pressure plate 20 and the lifting portion 29 will be driven to move to the right. At this time, the inclined surface of the lifting portion 29 will abut against the inner circumference of the water meter case 4, so that the water meter case 4 can be lifted upward to assist in unloading the water meter case 4. When the lifting portion 29 is away from the water meter case 4 and the slider 19 slides to the right end of the slide groove 18, the pressure plate 20 will not continue to move to the right, and the abutment plate 6 will continue to abut against the left side of the vertical section 31 to drive the pry bar 28 to rotate clockwise around the connecting axis as a whole to achieve avoidance, so that the abutment plate 6 can be reset to the right side of the pry bar 28 to prepare for the next clamping.

[0047] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A welding device for an irregularly shaped stainless steel water meter case, comprising a chuck for placing a weldment, wherein a plurality of claws are slidably provided on the chuck, characterized in that: The chuck is provided with a pre-positioning component for flexibly fixing the weldment and a first power component for driving the jaws to move; The pre-positioning assembly includes a plurality of positioning plates, each of which is elastically arranged on the chuck. When the first power assembly drives the clamping claw to move toward the weldment, the clamping claw accumulates force on the positioning plate.

2. A welding device for irregular-shaped stainless steel water meter casing according to claim 1, characterized in that: The chuck is provided with an abutting plate, and a first spring is provided between the abutting plate and the positioning plate.

3. A welding device for irregular shape of stainless steel water meter case according to claim 2, characterized in that: The positioning plate is provided with an inclined surface.

4. A welding device for irregular shape of stainless steel water meter case according to claim 2, characterized in that: The first power assembly includes a cylinder and a transmission barrel connected to the output end of the cylinder, and a connecting rod is provided between each of the claws and the transmission barrel.

5. A welding device for irregular-shaped stainless steel water meter casing according to claim 4, characterized in that: The clamping claw is provided with a first tooth plate, the abutting plate is provided with a second tooth plate, and a gear is rotatably provided on the chuck, and the first tooth plate and the second tooth plate are both engaged with the gear.

6. A welding device for irregular-shaped stainless steel water meter casing according to claim 2, characterized in that: A groove is provided on the positioning plate, a sliding groove is provided on the inner wall of the groove, a slider is slidingly provided inside the sliding groove, a pressure plate is rotatably provided on the slider, and a first torsion spring is provided between the pressure plate and the slider.

7. A welding device for irregular-shaped stainless steel water meter casing according to claim 6, characterized in that: A second spring is provided between the slider and the sliding groove.

8. A welding device for irregular-shaped stainless steel water meter cases according to claim 6, characterized in that: The sliding block is provided with a first limiting portion, and the first limiting portion is located on the rotation stroke of the pressing plate.

9. A welding device for irregular-shaped stainless steel water meter casing according to claim 6, characterized in that: A second limiting portion is elastically provided on the slider; The second limiting portion has a first position abutting against the pressure plate and a second position away from the pressure plate. A second power component for driving the pressure plate to switch between the first position and the second position is provided inside the sliding groove.

10. A welding device for irregular-shaped stainless steel water meter casing according to claim 9, characterized in that: The second power assembly includes an abutment block, a wedge portion is provided on the second limiting portion, the wedge portion is located on the movement stroke of the abutment block, and a third spring is provided between the second limiting portion and the slider.

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