A water heater inner container positioning and welding device

Abstract

A water heater inner bag positioning welding device, including welding box, box door, base, support assembly, moving seat, profiling rotary head, welding assembly, collection assembly, first drive part, second drive part, third drive part and fourth drive part, base is installed to welding box, the middle part of base is equipped with height platform, two support assemblies are respectively movable installation in height platform, two moving seats are respectively movable installation in the left and right ends of base, profiling rotary head is rotatable installation in moving seat, welding assembly is movable installation in base. The utility model discloses a water heater inner bag positioning welding device according to above-mentioned content, solves the inner bag welding device in the prior art, cannot be compatible with the welding of different lengths, and the commonality is lower, and in the welding engineering, the dust impurities produced by eating not only easily adhere to the surface of inner bag, influence the production quality of product, but also will be in the workshop, pollute the production environment of workshop and the health of operating personnel's problem.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, and in particular to a positioning welding device for the inner tank of a water heater. Background Technology

[0002] In modern life, water heaters are indispensable household appliances, and the quality of their inner tank directly affects the water heater's performance, lifespan, and safety. Inner tank welding technology, as a crucial step in water heater production, plays a decisive role in product quality. However, existing inner tank welding devices are incompatible with welding of different lengths, resulting in low versatility. Furthermore, the dust and debris generated during welding not only easily adhere to the surface of the inner tank, affecting product quality, but also pollute the workshop environment and endanger the health of operators. Utility Model Content

[0003] The purpose of this utility model is to propose a positioning welding device for the inner tank of a water heater, which solves the problems of existing inner tank welding devices, which cannot be compatible with welding of different lengths, have low versatility, and generate dust and debris during the welding process that not only easily adhere to the surface of the inner tank, affecting the production quality of the product, but also drift in the workshop, polluting the production environment and endangering the health of operators.

[0004] To achieve this objective, the present invention adopts the following technical solution: A water heater inner tank positioning welding device includes a welding box, a box door, a base, a support assembly, a movable seat, a contour rotating head, a welding assembly, a collecting assembly, a first driving part, a second driving part, a third driving part, and a fourth driving part. The box door is slidably installed on the welding box, the base is installed on the welding box, the middle of the base is provided with a height platform, and the two support components are respectively movably installed on the height platform. The first driving part is used to drive the two support components to move closer to each other or further away from each other. The two movable seats are respectively movably installed at the left and right ends of the base. The second driving unit is used to drive the movable seats to move left and right. The contouring rotating head is rotatably installed on the movable seat. The third driving unit is used to drive the contouring rotating head to rotate. The welding assembly is movably installed on the base. The welding assembly is used to perform laser welding on the inner tank of the water heater. The fourth driving unit is used to drive the welding assembly to move left and right. The collecting component is installed on the movable base and is located below the contouring rotating head. The collecting component is used to collect dust and debris generated by laser welding.

[0005] Furthermore, the support assembly includes a support base and rollers. Multiple rollers are respectively installed at the front and rear ends of the top of the support base, and the multiple rollers are evenly spaced along the left and right direction of the support base. The first driving unit includes a first motor, a first gear, a first geared rail, a first slide rail, and a first slider; The first slide rail is installed on the top surface of the height platform, the first slider is installed on the bottom of the support base, and the first slider is slidably installed on the first slide rail; The height platform is provided with a clearance area. The first motor is installed in the clearance area. The output end of the first motor protrudes from the top surface of the height platform, and the first gear is installed on the output end of the first motor. The first gear is installed on the support base. The first gear meshes with the first gear, and the two first gears are arranged symmetrically around the first gear.

[0006] Specifically, the first drive unit further includes a protective cover, which is installed on the top surface of the height platform and covers the meshing point between the first gear and the first gear rail.

[0007] Preferably, the top of the left and right sides of the height platform is provided with a stop bar, and the left and right outer sides of the height platform are provided with a limiting block. The first slider can abut against the stop bar, and the movable seat can abut against the limiting block.

[0008] In some embodiments, the second drive unit includes a second motor, a second gear, a second gear rail, a second slide rail, a second slider, and a protective cover; The second slide rail and the second gear rail are respectively installed on the base. The second gear rail is located between the two second slide rails. The second slider is installed on the bottom of the movable seat and is slidably installed on the second slide rail. The second motor is installed on the movable seat. The output end of the second motor is equipped with the second gear, which meshes with the second gear rail. The protective cover is installed on the movable seat and covers the second motor and the third drive unit.

[0009] Furthermore, the collection assembly includes a collection funnel and a negative pressure tube. The collection funnel is mounted on the movable base, with its collection port facing the contour-following rotating head. The negative pressure tube is installed at the bottom of the collection funnel.

[0010] Specifically, the welding assembly includes a moving table, a mounting base, a lifting plate, a rotating plate, a moving bar, a welding torch, a fifth driving unit, a sixth driving unit, and a seventh driving unit; The mounting base is mounted on the movable platform. The lifting plate is movable up and down and mounted on the mounting base. The rotating plate is rotatably mounted on the lifting plate. The moving bar is movably mounted on the rotating plate. The welding torch is mounted on the moving bar. The fifth driving unit is used to drive the lifting plate to move up and down. The sixth driving unit is used to drive the rotating plate to rotate. The seventh driving unit is used to drive the moving bar to move back and forth.

[0011] Preferably, the fourth drive unit includes a fourth motor, a fourth gear, a fourth gear rail, and a fourth slide rail; The base has a mounting plate at its rear end. The fourth gear and the fourth slide rail are respectively mounted on the mounting plate. The moving platform is slidably mounted on the fourth slide rail. The fourth motor is mounted on the moving platform. The output end of the fourth motor is equipped with the fourth gear, which meshes with the fourth gear.

[0012] Compared with the prior art, one of the above technical solutions has the following beneficial effects: The device comprises a welding box, a door, a base, a support assembly, a movable seat, a contouring rotating head, a welding assembly, a collection assembly, a first drive unit, a second drive unit, a third drive unit, and a fourth drive unit. The first drive unit can drive the two support assemblies to move closer or further apart, thus adapting to welding water heater inner tanks of different lengths. This improves the versatility of the water heater inner tank positioning welding device. Furthermore, the protruding and recessed hemispherical structures correspond to the bottom and top covers of the water heater inner tank, respectively. When the movable seat approaches, they fit tightly and press together, achieving precise positioning and ensuring the stability of both ends of the inner tank during welding. Moreover, the entire welding process is completed inside the welding box, greatly improving the safety of laser welding. Additionally, the collection assembly below the contouring rotating head uses negative pressure adsorption to remove dust and debris generated during laser welding, preventing them from affecting welding quality and harming the health of operators. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a water heater inner tank positioning and welding device according to one embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of a contour-following rotary head according to one embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the first driving unit according to one embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the collection component according to one embodiment of the present invention; Figure 5 This is a schematic diagram of the welding assembly according to one embodiment of the present invention; The components include: welding box 11, box door 12, base 2, height platform 21, clearance area 22, stop bar 23, limit block 24, mounting plate 25, support assembly 3, support seat 31, roller 32, moving seat 41, contour rotating head 42, welding assembly 5, moving table 51, mounting seat 52, lifting plate 53, rotating plate 54, moving bar 55, welding torch 56, fifth drive unit 57, sixth drive unit 58, seventh drive unit 59, collection assembly 6, collection funnel 61, negative pressure pipe 62, first drive unit 7, first gear 72, first gear rail 73, first slide rail 74, first slider 75, protective cover 76, second drive unit 8, second motor 81, second gear rail 83, second slide rail 84, second slider 85, protective cover 86, third drive unit 9, fourth drive unit 10, fourth motor 101, fourth gear rail 103, and fourth slide rail 104. Detailed Implementation

[0014] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0015] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," "inner side," "outer side," "inner end," "outer end," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish descriptive features, without any order or emphasis. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0016] In one embodiment of this utility model, such as Figure 1-5As shown, a water heater inner tank positioning welding device includes a welding box 11, a box door 12, a base 2, a support assembly 3, a movable seat 41, a contouring rotating head 42, a welding assembly 5, a collecting assembly 6, a first driving unit 7, a second driving unit 8, a third driving unit 9, and a fourth driving unit 10. The box door 12 is slidably mounted on the welding box 11, and the base 2 is mounted on the welding box 11. A height platform 21 is provided in the middle of the base 2, and the two support assemblies 3 are respectively movably mounted on the height platform 21. The first driving unit 7 is used to drive the two support assemblies 9 and 10. The supporting components 3 are close to or far from each other; the two movable seats 41 are respectively movably installed at the left and right ends of the base 2; the second driving part 8 is used to drive the movable seats 41 to move left and right; the contouring rotating head 42 is rotatably installed on the movable seat 41; the third driving part 9 is used to drive the contouring rotating head 42 to rotate; the welding component 5 is movably installed on the base 2; the welding component 5 is used to perform laser welding on the inner tank of the water heater; and the fourth driving part 10 is used to drive the welding component 5 to move left and right.The collecting component 6 is installed on the movable base 41 and is located below the contouring rotating head 42. The collecting component 6 is used to collect dust and debris generated during laser welding. In this embodiment, there are two of each of the following components: the door 12, the support component 3, the movable base 41, the contouring rotating head 42, the welding component 5, the collecting component 6, the second drive unit 8, the third drive unit 9, and the fourth drive unit 10. The two doors 12 are slidably installed on the inner side of the welding box 11 to achieve the purpose of opening and closing. The two doors 12 are provided with corresponding observation windows to facilitate observation of the welding process. The two movable bases 41 are respectively installed on the left and right sides of the base 2. Each movable base 41 is respectively... The conforming rotating head 42 is installed. Specifically, one conforming rotating head 42 is a protruding hemispherical structure, corresponding to the bottom cover of the concave structure of the water heater inner tank, and the other conforming rotating head 42 is a concave hemispherical structure, corresponding to the top cover of the protruding structure of the water heater inner tank. The third drive unit 9 is installed on the moving base 41. The third drive unit 9 is a motor reduction gearbox structure. The output end of the third drive unit 9 is connected to the conforming rotating head 42. During operation, the welding box 11 is opened by pushing and pulling the two box doors 12, and then the length of the main body of the water heater inner tank is determined. The first driving unit 7 drives the two supporting components 3 to move closer or further apart to adjust them. After adjustment, the water heater inner tank is placed on the two supporting components 3. It should be noted that at this time, the bottom cover and top cover are respectively fastened to the left and right ends of the water heater inner tank. After the water heater inner tank is placed, the door 12 is closed. Then, the two second driving units 8 drive the two moving seats 41 to move closer together, so that the two contour rotating heads 42 respectively engage with the bottom cover and top cover, and press and position the bottom cover and top cover at both ends of the water heater inner tank. Then, the two fourth driving units 10 drive... The two welding components 5 are moved to their corresponding positions, and then the two welding components 5 perform laser welding on the weld areas of the bottom cover and the top cover respectively. At the same time, the third driving unit 9 drives the contouring rotating head 42 to rotate. Under the action of the bottom cover and the top cover pressing and fastening each other, the two ends of the water heater inner tank body rotate at the support component 3, thereby completing the entire laser welding step. During the laser welding process, the collection component 6 below the contouring rotating head 42 sucks away the dust and debris generated by the laser welding through negative pressure adsorption.This utility model comprises a welding box 11, a door 12, a base 2, a support assembly 3, a movable seat 41, a contouring rotating head 42, a welding assembly 5, a collection assembly 6, a first drive unit 7, a second drive unit 8, a third drive unit 9, and a fourth drive unit 10. The first drive unit 7 can drive the two support assemblies 3 to move closer or further apart, thereby adapting to welding water heater inner tanks of different lengths. This improves the versatility of the water heater inner tank positioning welding device. Furthermore, the protruding and recessed hemispherical structures correspond to the bottom and top covers of the water heater inner tank, respectively, and fit tightly and press together when the movable seat 41 approaches, achieving precise positioning and ensuring the stability of both ends of the inner tank during welding. Moreover, the entire welding process is completed within the welding box 11, greatly improving the safety of laser welding. Additionally, the collection assembly 6, located below the contouring rotating head 42, uses negative pressure adsorption to remove dust and debris generated during laser welding, preventing them from affecting welding quality and harming the health of operators.

[0017] like Figure 2-3 As shown, the support assembly 3 includes a support base 31 and rollers 32. Multiple rollers 32 are respectively installed at the front and rear ends of the top of the support base 31, and the multiple rollers 32 are evenly spaced along the left and right directions of the support base 31. The first drive unit 7 includes a first motor, a first gear 72, a first gear rail 73, a first slide rail 74, and a first slider 75; The first slide rail 74 is installed on the top surface of the height platform 21, and the first slider 75 is installed on the bottom of the support base 31. The first slider 75 is slidably installed on the first slide rail 74. The height platform 21 is provided with a clearance area 22. The first motor is installed in the clearance area 22. The output end of the first motor protrudes from the top surface of the height platform 21, and the first gear 72 is installed on the output end of the first motor. The first gear rail 73 is installed on the support base 31. The first gear rail 73 meshes with the first gear 72, and the two first gear rails 73 are arranged symmetrically around the first gear 72. In this embodiment, each support base 31 is equipped with six rollers 32, and two first sliders 75 are installed at the bottom of each support base 31. There are two first slide rails 74 and two first gear rails 73. The two first slide rails 74 are respectively installed on the top surface of the height platform 21, and the two first gear rails 73 are respectively installed on the bottom of the corresponding support base 31. The two first gear rails 73 are located inside the two first slide rails 74, and the two first gear rails 73 are rotationally symmetrically arranged along the first gear 72, that is, the front and rear sides of the first gear 72 respectively mesh with the corresponding first gear rails 73. During operation, according to the heat... The length of the main body of the water heater inner tank is adjusted to the distance between the two support seats 31. Specifically, the first motor drives the first gear 72 at its output end to rotate. The rotation of the first gear 72 drives the first toothed rails 73 on its front and rear sides to move left and right, so that the two support seats 31 move closer or further apart along the length direction of the first slide rail 74 via the first slider 75. After the distance between the two support seats 31 is adjusted, the main body of the water heater inner tank is placed on the multiple rollers 32 on the top of the support seats 31. The multiple rollers 32 not only provide support, but also assist the rotation of the main body of the water heater inner tank, ensuring welding efficiency and welding quality.

[0018] like Figure 2-3 As shown, the first drive unit 7 also includes a protective cover 76, which is installed on the top surface of the height platform 21 and covers the meshing point of the first gear 72 and the first gear rail 73. In this embodiment, the protective cover 76 is provided at the meshing point of the first gear 72 and the first gear rail 73 to effectively prevent foreign objects from falling from above into the meshing point, thereby effectively avoiding jamming due to foreign objects and improving the working stability and reliability of the first drive unit 7.

[0019] like Figure 2-3As shown, the top of the left and right sides of the height platform 21 is provided with baffles 23, and the left and right outer sides of the height platform 21 are provided with limiting blocks 24. The first slider 75 can abut against the baffles 23, and the movable seat 41 can abut against the limiting blocks 24. In this embodiment, the baffles 23 are provided on the top of the left and right sides of the height platform 21 so that the first slider 75 of the support seat 31 can abut against the baffles 23, thereby preventing the support seat 31 from falling off the top surface of the height platform 21. Furthermore, the limiting blocks 24 are provided on the left and right outer sides of the height platform 21. The limiting blocks 24 are made of rubber and can limit the movement of the movable seat 41 beyond the preset stroke and collide with other components.

[0020] like Figure 2-4 As shown, the second drive unit 8 includes a second motor 81, a second gear, a second gear rail 83, a second slide rail 84, a second slider 85, and a protective cover 86. The second slide rail 84 and the second gear rail 83 are respectively installed on the base 2, with the second gear rail 83 located between the two second slide rails 84. The second slider 85 is installed on the bottom of the movable seat 41 and is slidably mounted on the second slide rail 84. The second motor 81 is installed on the movable seat 41, and the output end of the second motor 81 is equipped with the second gear, which meshes with the second gear rail 83. The protective cover 86 is installed on the movable seat 41 and covers the second motor 81 and the third drive unit 9.

[0021] In this embodiment, during operation, the second motor 81 drives the second gear at its output end to rotate. Under the meshing action of the second gear and the second gear rail 83, the movable seat 41 moves left and right along the length direction of the second slide rail 84 via the second slider 85. The protective cover 86 is provided on the movable seat 41, and the protective cover 86 covers the second motor 81 and the third drive unit 9, thereby playing a protective role.

[0022] like Figure 2-4 As shown, the collection assembly 6 includes a collection funnel 61 and a negative pressure tube 62. The collection funnel 61 is mounted on the movable base 41, with its collection opening facing the contour-following rotating head 42. The negative pressure tube 62 is installed at the bottom of the collection funnel 61. In this embodiment, one end of the negative pressure tube 62 is connected to the bottom of the collection funnel 61, and the other end is connected to an external negative pressure device. During operation, the external negative pressure device provides negative pressure, causing dust and debris generated during laser welding to fall into the collection funnel 61 and be collected through the negative pressure tube 62, which is convenient and quick.

[0023] like Figure 2 and Figure 5As shown, the welding assembly 5 includes a moving table 51, a mounting base 52, a lifting plate 53, a rotating plate 54, a moving bar 55, a welding torch 56, a fifth drive unit 57, a sixth drive unit 58, and a seventh drive unit 59. The mounting base 52 is mounted on the movable platform 51. The lifting plate 53 is movable up and down and mounted on the mounting base 52. The rotating plate 54 is rotatably mounted on the lifting plate 53. The moving bar 55 is movably mounted on the rotating plate 54. The welding torch 56 is mounted on the moving bar 55. The fifth driving unit 57 is used to drive the lifting plate 53 to move up and down. The sixth driving unit 58 is used to drive the rotating plate 54 to rotate. The seventh driving unit 59 is used to drive the moving bar 55 to move back and forth. In this embodiment, the fifth drive unit 57 and the seventh drive unit 59 are both telescopic cylinders, and the sixth drive unit 58 is a rotary cylinder. During installation, the mounting base 52 is mounted on the moving platform 51, the fifth drive unit 57 is mounted on the mounting base 52, the output end of the fifth drive unit 57 is connected to the lifting plate 53, the sixth drive unit 58 is mounted on the lifting plate 53, the output end of the sixth drive unit 58 is connected to the rotating plate 54, the seventh drive unit 59 is mounted on the rotating plate 54, and the output end of the seventh drive unit 59 is connected to the moving bar 55. With the above structure, the welding torch 56 can move up and down, move back and forth, and rotate to adjust the welding angle and welding position, making it suitable for more welding scenarios.

[0024] like Figure 3 and Figure 5 As shown, the fourth drive unit 10 includes a fourth motor 101, a fourth gear, a fourth gear rail 103, and a fourth slide rail 104. The rear end of the base 2 is provided with a mounting plate 25. The fourth gear rail 103 and the fourth slide rail 104 are respectively mounted on the mounting plate 25. The moving platform 51 is slidably mounted on the fourth slide rail 104. The fourth motor 101 is mounted on the moving platform 51. The fourth gear is mounted on the output end of the fourth motor 101, and the fourth gear meshes with the fourth gear rail 103. In this embodiment, during operation, the fourth motor 101 drives the fourth gear at its output end to rotate. Under the meshing action of the fourth gear and the fourth gear rail 103, the moving platform 51 moves left and right along the length direction of the fourth slide rail 104, which is convenient, fast, and has high transmission efficiency.

[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A positioning and welding device for the inner tank of a water heater, characterized in that: It includes a welding box, a box door, a base, a support assembly, a movable seat, a contouring rotary head, a welding assembly, a collection assembly, a first drive unit, a second drive unit, a third drive unit, and a fourth drive unit; The box door is slidably installed on the welding box, the base is installed on the welding box, the middle of the base is provided with a height platform, and the two support components are respectively movably installed on the height platform. The first driving part is used to drive the two support components to move closer to each other or further away from each other. The two movable seats are respectively movably installed at the left and right ends of the base. The second driving unit is used to drive the movable seats to move left and right. The contouring rotating head is rotatably installed on the movable seat. The third driving unit is used to drive the contouring rotating head to rotate. The welding assembly is movably installed on the base. The welding assembly is used to perform laser welding on the inner tank of the water heater. The fourth driving unit is used to drive the welding assembly to move left and right. The collecting component is installed on the movable base and is located below the contouring rotating head. The collecting component is used to collect dust and debris generated by laser welding.

2. The water heater inner tank positioning welding device according to claim 1, characterized in that: The support assembly includes a support base and rollers. Multiple rollers are respectively installed at the front and rear ends of the top of the support base, and the multiple rollers are evenly spaced along the left and right direction of the support base. The first driving unit includes a first motor, a first gear, a first geared rail, a first slide rail, and a first slider; The first slide rail is installed on the top surface of the height platform, the first slider is installed on the bottom of the support base, and the first slider is slidably installed on the first slide rail; The height platform is provided with a clearance area. The first motor is installed in the clearance area. The output end of the first motor protrudes from the top surface of the height platform, and the first gear is installed on the output end of the first motor. The first gear is installed on the support base. The first gear meshes with the first gear, and the two first gears are arranged symmetrically around the first gear.

3. The water heater inner tank positioning welding device according to claim 2, characterized in that: The first drive unit also includes a protective cover, which is installed on the top surface of the height platform and covers the meshing point of the first gear and the first gear rail.

4. The water heater inner tank positioning welding device according to claim 2, characterized in that: The top of the left and right sides of the height platform is provided with a stop bar, and the left and right outer sides of the height platform are provided with a limiting block. The first slider can abut against the stop bar, and the movable seat can abut against the limiting block.

5. The water heater inner tank positioning welding device according to claim 1, characterized in that: The second drive unit includes a second motor, a second gear, a second gear rail, a second slide rail, a second slider, and a protective cover; The second slide rail and the second gear rail are respectively installed on the base. The second gear rail is located between the two second slide rails. The second slider is installed on the bottom of the movable seat and is slidably installed on the second slide rail. The second motor is installed on the movable seat. The output end of the second motor is equipped with the second gear, which meshes with the second gear rail. The protective cover is installed on the movable seat and covers the second motor and the third drive unit.

6. The water heater inner tank positioning welding device according to claim 1, characterized in that: The collection assembly includes a collection funnel and a negative pressure tube. The collection funnel is mounted on the movable base, with its collection port facing the contour-following rotating head. The negative pressure tube is installed at the bottom of the collection funnel.

7. The water heater inner tank positioning welding device according to claim 1, characterized in that: The welding assembly includes a moving table, a mounting base, a lifting plate, a rotating plate, a moving bar, a welding torch, a fifth drive unit, a sixth drive unit, and a seventh drive unit; The mounting base is mounted on the movable platform. The lifting plate is movable up and down and mounted on the mounting base. The rotating plate is rotatably mounted on the lifting plate. The moving bar is movably mounted on the rotating plate. The welding torch is mounted on the moving bar. The fifth driving unit is used to drive the lifting plate to move up and down. The sixth driving unit is used to drive the rotating plate to rotate. The seventh driving unit is used to drive the moving bar to move back and forth.

8. A water heater inner tank positioning welding device according to claim 7, characterized in that: The fourth drive unit includes a fourth motor, a fourth gear, a fourth gear rail, and a fourth slide rail; The base has a mounting plate at its rear end. The fourth gear and the fourth slide rail are respectively mounted on the mounting plate. The moving platform is slidably mounted on the fourth slide rail. The fourth motor is mounted on the moving platform. The output end of the fourth motor is equipped with the fourth gear, which meshes with the fourth gear.

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