Automatic spin welding device and method for automobile bent pipe fitting

Abstract

The invention discloses an automatic rotary welding device and method for an automobile bent pipe fitting, and belongs to the technical field of automobile part machining. A welding head is aligned to the welding position of the pipe fitting, an output shaft of a first motor drives two driving gears to rotate, and the driving gears drive driven gears to rotate through connecting gears; the driven gear can drive the gear ring to rotate, the gear ring drives the sliding ring to slide in the sliding way, the sliding way can play a role in supporting and limiting the sliding ring, the welding assembly can be driven to revolve around the center of the pipe fitting in the rotating process of the gear ring, and meanwhile the welding assembly works; the welding gun and the welding head are matched to carry out automatic rotating welding on the connecting position of the pipe fitting, so that a multi-section welding mode is abandoned, defects at the arc starting and stopping positions of a welding seam are prevented, the welding effect is improved, when the pipe fitting is welded, the pipe fitting does not need to be rotated, the bending part of the pipe fitting is prevented from interfering with the rotating stroke, and the welding difficulty is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile parts processing, and in particular relates to an automatic rotary welding device and method for automobile curved pipe fittings. Background Art

[0002] The welding of automobile curved pipe fittings is an important link in the automobile production process, especially in the exhaust system. The welding quality of the curved pipe directly affects the performance and safety of the entire exhaust system. The welding methods of automobile curved pipe fittings usually include manual arc welding, gas shielded welding and submerged arc automatic welding.

[0003] At present, conventional welding tools can usually only clamp straight pipes to assist welding work. In the process of welding curved automobile pipe fittings, multi-stage welding is required, which will cause defects in the arc starting and ending points of multiple welds in the welding joints, resulting in a low welding qualification rate. Due to the special shape of curved pipe fittings, during rotary welding, the bent part of the pipe fitting will interfere with the rotary stroke, increasing the difficulty of welding. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the present invention provides an automatic rotary welding device and method for automobile curved pipe fittings, which solves the problem that in the process of welding automobile curved pipe fittings, a multi-stage welding method needs to be adopted, which will cause defects at the starting and ending points of multiple welds in the welding joints, resulting in a low welding qualification rate. Due to the special shape of the curved pipe fittings, during rotary welding, the bent part of the pipe fitting will interfere with the rotation stroke, increasing the difficulty of welding.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an automatic rotary welding device for automobile curved pipe fittings, comprising a fixed frame, a support seat is fixedly connected to the top of the inner wall of the fixed frame, a recess is provided at the bottom of the support seat, a pipe fitting is provided in the recess, an adjustment assembly is installed on one side of the support seat, a baffle is fixedly connected to the other side of the support seat, limiting assemblies are respectively installed on the sides where the adjustment assembly and the baffle are away from each other, the pipe fitting is arranged at the bottom of two limiting assemblies, a deflection assembly is connected to the bottom of the adjustment assembly, a welding assembly is installed on one side of the inner wall of the deflection assembly, the welding assembly is located between the limiting assembly and the support seat, and the welding assembly is arranged above the pipe fitting, a slideway is provided on the side of the support seat close to the deflection assembly, and the deflection assembly is slidably connected in the slideway.

[0006] As a further solution of the present invention: reinforcement rods are fixedly connected to both sides of the support seat, the top ends of the two reinforcement rods are fixed to the top of the inner wall of the fixing frame, and anti-slip pads are respectively provided at the four corners of the bottom of the fixing frame.

[0007] As a further solution of the present invention: the adjustment assembly includes a bracket, the bracket is fixedly connected to one side of the support seat, a first motor is installed on the outer side of the bracket, a driving gear is fixed on the output shaft of the first motor, the driving gear is externally meshed with a connecting gear, a driven gear is meshed on the connecting gear, the driving gear, the connecting gear and the driven gear are respectively installed inside the bracket, and the driven gear is connected to the outside of the deflection assembly.

[0008] As a further solution of the present invention: the limiting assembly includes a fixed seat, the fixed seat is installed on the adjusting assembly, a screw rod is installed in the fixed seat, the top end of the screw rod passes through the fixed seat and is connected to a second motor, the second motor is fixed on one side of the adjusting assembly, and the bottom end of the screw rod is movably connected to the bottom of the inner wall of the fixed seat.

[0009] As a further solution of the present invention: the external thread of the screw rod is connected to a movable plate, and hinge rods are respectively installed on both sides of the bottom of the movable plate. The middle part of the hinge rod is hinged to the fixed seat through a pin shaft, and a splint is installed at the bottom end of the hinge rod. One side of the top of the splint is hinged with a support arm through a pin shaft, and the top of the support arm is hinged to the bottom of the fixed seat through a pin shaft.

[0010] As a further solution of the present invention: the deflection assembly includes a gear ring, which is meshed with the driven gear, and the two sides of the gear ring are respectively fixedly connected with ear plates and slip rings, the slip rings are slidably connected in the slideway, the cross-sectional shapes of the slip ring and the slideway are both T-shaped, and the welding assembly is fixed to the inner walls of the gear ring and the ear plates.

[0011] As a further solution of the present invention: the welding assembly includes an extension block, the extension block is fixed to the inner wall of the deflection assembly, a welding gun is installed on the other side of the extension block, and a welding head is threadedly connected to the bottom end of the welding gun.

[0012] A method for using an automatic rotary welding device for automobile curved pipe fittings, the method comprising the following steps:

[0013] When welding the curved pipe fittings of automobiles, the pipe fittings are placed in the notch at the bottom of the support seat so that the pipe fittings can pass through the clamping plates in the two limit assemblies, and the pipe fittings are moved horizontally so that the welding position of the pipe fittings corresponds to the position of the welding assembly. Secondly, the second motor is controlled to drive the screw rod to rotate. Since the moving plate is threadedly connected to the outside of the screw rod, the moving plate can move up and pull the hinged rods on both sides so that the middle part of the hinged rod rotates around the end of the fixed seat. The bottom end of the hinged rod can push the clamping plate to rotate during the deflection process, so that the two opposite clamping plates are closed and the pipe fittings are clamped. The clamping plates are supported by the support arms to improve the stability of the clamping plates on the pipe fittings.

[0014] After completing the locking work of the pipe fitting, the welding head in the welding assembly is aligned with the welding part of the pipe fitting, and the first motor is started. The output shaft of the first motor drives the two driving gears to rotate, and the driving gear drives the driven gear to rotate through the connecting gear. Since the two driven gears have the same rotation direction and are meshed with the gear ring, the driven gear can drive the gear ring to rotate, and the gear ring drives the slip ring to slide in the slideway. Since the cross-sectional shapes of the slip ring and the slideway are both T-shaped, the slideway can play a role in supporting and limiting the slip ring, ensuring the stability of the rotation of the gear ring and the ear plate. During the rotation of the gear ring, the welding assembly can be driven to revolve around the center of the pipe fitting. At the same time, the welding assembly works, and the welding gun and the welding head cooperate to automatically weld the connection of the pipe fitting. After the welding gun and the welding head rotate around the outer wall of the pipe fitting for one circle, the first motor is started to reverse, so that the welding assembly can return to its position;

[0015] When welding pipes of different specifications, in order to ensure the best welding distance between the welding head and the outer wall of the pipe, the first motor is controlled to work, so that the driven gear in the adjustment component drives the gear ring to rotate, and the gear ring drives the welding component to rotate, so that the welding component is not blocked by the limit component, and the first motor is controlled to stop working, and then the welding head is rotated. Since the welding head is threadedly connected to the end of the welding gun, the welding head can be freely extended and adjusted inside the welding gun, thereby facilitating the adjustment of the distance between the welding head and the outer wall of the pipe;

[0016] When removing the pipe fitting, control the second motor to reverse and drive the screw to rotate. During the rotation of the screw, the moving plate will move downward. The moving plate squeezes the two hinged rods at the bottom to push the two clamps to deflect, that is, the two clamps can open, thereby releasing the locking state of the pipe fitting, and then the pipe fitting can be removed.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, by aligning the welding head with the welding part of the pipe fitting, the output shaft of the first motor drives the two driving gears to rotate, and the driving gear drives the driven gear to rotate through the connecting gear. Since the two driven gears have the same rotation direction and are meshed with the gear ring, the driven gear can drive the gear ring to rotate, and the gear ring drives the slip ring to slide in the slideway. Since the cross-sectional shapes of the slip ring and the slideway are both T-shaped, the slideway can play a role in supporting and limiting the slip ring, thereby ensuring the stability of the rotation of the gear ring and the ear plate. During the rotation of the gear ring, the welding assembly can be driven to revolve around the center of the pipe fitting. At the same time, the welding assembly works, and the welding gun cooperates with the welding head to automatically rotate and weld the connection of the pipe fitting, thereby abandoning the method of using multi-segment welding, preventing defects from occurring at the arc start and end of the weld, improving the welding effect, and when welding the pipe fitting, there is no need to rotate the pipe fitting, preventing the bending part of the pipe fitting from interfering with the rotation stroke, reducing the welding difficulty.

[0019] The two hinged rods on both sides are connected to the movable plate, and the movable plate can be moved upward to pull the hinged rods on both sides so that the middle part of the hinged rod can rotate around the end part of the fixed seat. The bottom end of the hinged rod can push the clamping plate to rotate during the deflection process, so that the two relative clamping plates can be closed and the pipe fitting can be clamped, and the clamping plate can be supported by the support arm to improve the stability of the clamping plate on the pipe fitting. When the pipe fitting is removed, the second motor is controlled to reverse and drive the screw rod to rotate. During the rotation of the screw rod, the movable plate will move downward, and the movable plate squeezes the two hinged rods at the bottom to push the two clamping plates to deflect, that is, the two clamping plates can be opened, which is convenient for releasing the locking state of the pipe fitting, thereby improving the loading and unloading efficiency of the pipe fitting.

[0020] 3. In the present invention, by controlling the operation of the first motor, the driven gear in the adjusting assembly drives the gear ring to rotate, and the gear ring drives the welding assembly to rotate, so that the welding assembly is not blocked by the limiting assembly, and the first motor is controlled to stop working. Secondly, the welding head is rotated. Since the welding head is threadedly connected to the end of the welding gun, the welding head can be freely extended and retracted inside the welding gun, thereby facilitating the adjustment of the distance between the welding head and the outer wall of the pipe fitting. When welding pipe fittings of different specifications, the optimal welding distance between the welding head and the outer wall of the pipe fitting is guaranteed, thereby making the welding device more versatile. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the present invention when viewed from above;

[0023] Figure 3 It is a structural schematic diagram of the connection between the support seat and the adjustment assembly of the present invention;

[0024] Figure 4 It is a schematic diagram of the positional relationship between the support base and two limit assemblies of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the cross section of the regulating component of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the limiting assembly of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the connection between the deflection assembly and the welding assembly of the present invention;

[0028] Figure 8 It is a structural schematic diagram of the cross section of the support seat of the present invention;

[0029] In the figure: 1. fixed frame; 2. support seat; 3. reinforcement rod; 4. pipe fitting; 5. notch; 6. adjustment assembly; 601. bracket; 602. driving gear; 603. first motor; 604. connecting gear; 605. driven gear; 7. baffle; 8. limit assembly; 801. fixed seat; 802. screw rod; 803. second motor; 804. moving plate; 805. hinged rod; 806. clamping plate; 807. support arm; 9. deflection assembly; 901. gear ring; 902. ear plate; 903. slip ring; 10. welding assembly; 101. extension block; 102. welding gun; 103. welding head; 11. slideway. DETAILED DESCRIPTION

[0030] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0031] like Figure 1-4 As shown, the present invention provides a technical solution: an automatic rotary welding device for automobile curved pipe fittings, comprising a fixing frame 1, a support seat 2 is fixedly connected to the top of the inner wall of the fixing frame 1, a recess 5 is provided at the bottom of the support seat 2, and a pipe fitting 4 is arranged in the recess 5; reinforcement rods 3 are respectively fixedly connected to the two sides of the support seat 2, the top ends of the two reinforcement rods 3 are fixed to the top of the inner wall of the fixing frame 1, and anti-skid pads are respectively provided at the four corners of the bottom of the fixing frame 1, and the support seat 2 is supported by the two reinforcement rods 3 to improve the installation stability of the support seat 2, and the use of the anti-skid pads can ensure the stability of the entire welding work.

[0032] like Figure 5 As shown, an adjustment component 6 is installed on one side of the support base 2, and the adjustment component 6 includes a bracket 601, and the bracket 601 is fixedly connected to one side of the support base 2. A first motor 603 is installed on the outer side of the bracket 601, and a driving gear 602 is fixed on the output shaft of the first motor 603. The driving gear 602 is externally meshed and connected with a connecting gear 604, and a driven gear 605 is meshed on the connecting gear 604. The driving gear 602, the connecting gear 604 and the driven gear 605 are respectively installed inside the bracket 601, and the driven gear 605 is connected to the outside of the deflection component 9. The output shaft of the first motor 603 drives the two driving gears 602 to rotate, and the driving gear 602 drives the driven gear 605 to rotate through the connecting gear 604, so that the driven gear 605 can drive the welding component 10 to rotate by driving the deflection component 9, so as to facilitate the automatic adjustment of the position of the welding component 10.

[0033] like Figure 6As shown, the other side of the support seat 2 is fixedly connected with a baffle 7, and the side where the adjustment component 6 and the baffle 7 are away from each other is respectively installed with a limit component 8, and the limit component 8 includes a fixed seat 801, and the fixed seat 801 is installed on the bracket 601 and the baffle 7. A screw rod 802 is installed in the fixed seat 801, and the top end of the screw rod 802 passes through the fixed seat 801 and is connected to a second motor 803, and the second motor 803 is fixed on one side of the bracket 601, and the bottom end of the screw rod 802 is movably connected to the bottom of the inner wall of the fixed seat 801. The external thread of the screw rod 802 is connected to the movable plate 804, and hinge rods 805 are installed on both sides of the bottom of the movable plate 804. The middle part of the hinge rod 805 is hinged to the fixed seat 801 through a pin, and the bottom end of the hinge rod 805 is installed on the top side of the clamping plate 806 through a pin. Because the movable plate 804 is threadedly connected to the outside of the screw rod 802, the movable plate 804 can move up and down outside the screw rod 802 during the rotation of the screw rod 802, which is convenient for adjusting the angle of the two hinge rods 805 below to control the opening and closing of the clamping plate 806. The other side of the top of the splint 806 is hinged with a support arm 807 through a pin, and the top of the support arm 807 is hinged to the bottom of the fixed seat 801 through a pin. The bottom end of the hinged rod 805 can push the splint 806 to rotate during the deflection process, so that the two opposite splints 806 are closed and the pipe 4 is clamped. The support arm 807 cooperates to support the splint 806, thereby improving the stability of the splint 806 in clamping the pipe 4.

[0034] like Figure 7-8 As shown, the bottom of the adjustment component 6 is connected to a deflection component 9, and the deflection component 9 includes a gear ring 901, which is meshed with the driven gear 605, and the two sides of the gear ring 901 are respectively fixedly connected with an ear plate 902 and a slip ring 903; a slideway 11 is provided on one side of the support seat 2 close to the deflection component 9, and the slip ring 903 is slidably connected in the slideway 11, and the cross-sectional shapes of the slip ring 903 and the slideway 11 are both T-shaped; because the cross-sectional shapes of the slip ring 903 and the slideway 11 are The T-shape enables the slideway 11 to support and limit the slip ring 903, and the slip ring 903 will not separate from the slideway 11, thereby ensuring the stability of the rotation of the ring gear 901 and the ear plate 902; through the mutual cooperation between the ring gear 901 and the driven gear 605, because the two driven gears 605 have the same rotation direction and are meshed with the ring gear 901, the driven gear 605 can drive the ring gear 901 to rotate, thereby improving the stability of the ring gear 901 driving the welding assembly 10 to rotate.

[0035] A welding assembly 10 is installed on one side of the inner wall of the deflection assembly 9. The welding assembly 10 is located between the limit assembly 8 and the support seat 2, and the welding assembly 10 is arranged above the pipe fitting 4. The welding assembly 10 includes an extension block 101, which is fixed to the inner walls of the gear ring 901 and the ear plate 902. A welding gun 102 is installed on the other side of the extension block 101. The bottom end of the welding gun 102 is threadedly connected with a welding head 103. Since the welding head 103 is threadedly connected to the end of the welding gun 102, the welding head 103 can be freely telescopically adjusted inside the welding gun 102, which is convenient for adjusting the distance between the welding head 103 and the outer wall of the pipe fitting 4, and ensuring the optimal welding distance between the welding head 103 and the outer wall of the pipe fitting 4.

[0036] A method for using an automatic rotary welding device for automobile curved pipe fittings, the method comprising the following steps:

[0037] When welding the curved pipe fitting 4 of the automobile, the pipe fitting 4 is placed in the notch 5 at the bottom of the support seat 2, so that the pipe fitting 4 can pass through the clamping plates 806 in the two limiting assemblies 8, and the pipe fitting 4 is moved horizontally, so that the welding position of the pipe fitting 4 corresponds to the position of the welding assembly 10, and then the second motor 803 is controlled to work so that it drives the screw rod 802 to rotate. Since the movable plate 804 is threadedly connected to the outside of the screw rod 802, the movable plate 804 can move up and pull the hinge rods 805 on both sides, so that the middle part of the hinge rod 805 rotates around the end of the fixed seat 801, and the bottom end of the hinge rod 805 can push the clamping plate 806 to rotate during the deflection process, so that the two opposite clamping plates 806 are closed and the pipe fitting 4 is clamped, and the clamping plate 806 is supported by the support arm 807 to improve the stability of the clamping plate 806 on the pipe fitting 4;

[0038] After completing the locking work of the pipe fitting 4, the welding head 103 in the welding assembly 10 is aligned with the welding part of the pipe fitting 4, and the first motor 603 is started. The output shaft of the first motor 603 drives the two driving gears 602 to rotate, and the driving gear 602 drives the driven gear 605 to rotate through the connecting gear 604. Since the two driven gears 605 rotate in the same direction and are meshed with the gear ring 901, the driven gear 605 can drive the gear ring 901 to rotate, and the gear ring 901 drives the slip ring 903 to slide in the slideway 11. The cross-sectional shape of 11 is T-shaped, so that the slideway 11 can play the role of supporting and limiting the slip ring 903, ensuring the stability of the rotation of the gear ring 901 and the ear plate 902. During the rotation of the gear ring 901, the welding assembly 10 can be driven to revolve around the center of the pipe 4. At the same time, the welding assembly 10 works, and the welding gun 102 cooperates with the welding head 103 to automatically weld the connection of the pipe 4. After the welding gun 102 and the welding head 103 rotate around the outer wall of the pipe 4 for one circle, the first motor 603 is started to reverse, so that the welding assembly 10 can return to its original position;

[0039] When welding pipes 4 of different specifications, in order to ensure the best welding distance between the welding head 103 and the outer wall of the pipe 4, the first motor 603 is controlled to work, so that the driven gear 605 in the adjustment component 6 drives the ring gear 901 to rotate, and the ring gear 901 drives the welding component 10 to rotate, so that the welding component 10 is not blocked by the limit component 8, and the first motor 603 is controlled to stop working, and then the welding head 103 is rotated. Since the welding head 103 is threadedly connected to the end of the welding gun 102, the welding head 103 can be freely extended and adjusted inside the welding gun 102, so as to facilitate the adjustment of the distance between the welding head 103 and the outer wall of the pipe 4;

[0040] When removing the pipe fitting 4, control the second motor 803 to reverse and drive the screw rod 802 to rotate. During the rotation of the screw rod 802, the movable plate 804 will move downward, and the movable plate 804 will squeeze the two hinged rods 805 at the bottom to push the two clamping plates 806 to deflect, that is, the two clamping plates 806 can be opened, thereby releasing the locking state of the pipe fitting 4, and then the pipe fitting 4 can be removed.

[0041] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more schemes or examples in a suitable manner.

Claims

1. An automatic rotary welding device for automobile curved pipe fittings, comprising a fixing frame (1), characterized in that: The top of the inner wall of the fixing frame (1) is fixedly connected to a support seat (2), the bottom of the support seat (2) is provided with a notch (5), a pipe fitting (4) is arranged in the notch (5), an adjustment component (6) is installed on one side of the support seat (2), a baffle (7) is fixedly connected to the other side of the support seat (2), a limiting component (8) is respectively installed on the side away from each other of the adjustment component (6) and the baffle (7), the pipe fitting (4) is arranged at the bottom of the two limiting components (8), the bottom of the adjustment component (6) is connected to a deflection component (9), a welding component (10) is installed on one side of the inner wall of the deflection component (9), the welding component (10) is located between the limiting component (8) and the support seat (2), and the welding component (10) is arranged above the pipe fitting (4), a slideway (11) is opened on the side of the support seat (2) close to the deflection component (9), and the deflection component (9) is slidably connected in the slideway (11).

2. The automatic rotary welding device for automobile curved pipe fittings according to claim 1 is characterized in that: Reinforcement rods (3) are fixedly connected to both sides of the support seat (2), and the top ends of the two reinforcement rods (3) are fixed to the top of the inner wall of the fixing frame (1). Anti-slip pads are respectively provided at the four corners of the bottom of the fixing frame (1).

3. The automatic rotary welding device for automobile curved pipe fittings according to claim 1 is characterized in that: The adjustment assembly (6) comprises a bracket (601), wherein the bracket (601) is fixedly connected to one side of the support seat (2), a first motor (603) is installed on the outer side of the bracket (601), a driving gear (602) is fixed on the output shaft of the first motor (603), the driving gear (602) is externally meshedly connected to a connecting gear (604), a driven gear (605) is meshed on the connecting gear (604), the driving gear (602), the connecting gear (604) and the driven gear (605) are respectively installed inside the bracket (601), and the driven gear (605) is connected to the outside of the deflection assembly (9).

4. The automatic rotary welding device for automobile curved pipe fittings according to claim 1 is characterized in that: The limit assembly (8) comprises a fixed seat (801), wherein the fixed seat (801) is mounted on the adjustment assembly (6), wherein a screw rod (802) is mounted inside the fixed seat (801), wherein the top end of the screw rod (802) passes through the fixed seat (801) and is connected to a second motor (803), wherein the second motor (803) is fixed to one side of the adjustment assembly (6), and the bottom end of the screw rod (802) is movably connected to the bottom of the inner wall of the fixed seat (801).

5. The automatic rotary welding device for automobile curved pipe fittings according to claim 4 is characterized in that: The screw rod (802) is externally threadedly connected to a movable plate (804), and hinge rods (805) are respectively installed on both sides of the bottom of the movable plate (804), and the middle part of the hinge rod (805) is hinged to the fixed seat (801) through a pin shaft, and a clamping plate (806) is installed at the bottom end of the hinge rod (805), and one side of the top of the clamping plate (806) is hinged to a support arm (807) through a pin shaft, and the top end of the support arm (807) is hinged to the bottom of the fixed seat (801) through a pin shaft.

6. The automatic rotary welding device for automobile curved pipe fittings according to claim 3 is characterized in that: The deflection assembly (9) comprises a gear ring (901), the gear ring (901) is meshedly connected with a driven gear (605), an ear plate (902) and a slip ring (903) are fixedly connected to both sides of the gear ring (901), the slip ring (903) is slidably connected in a slideway (11), and the cross-sectional shapes of the slip ring (903) and the slideway (11) are both T-shaped, and the welding assembly (10) is fixed to the inner walls of the gear ring (901) and the ear plate (902).

7. The automatic rotary welding device for automobile curved pipe fittings according to claim 1, characterized in that: The welding assembly (10) comprises an extension block (101), the extension block (101) is fixed to the inner wall of the deflection assembly (9), a welding gun (102) is installed on the other side of the extension block (101), and a welding head (103) is threadedly connected to the bottom end of the welding gun (102).

8. A method for using an automatic rotary welding device for automobile curved pipe fittings, according to any one of claims 1 to 7, characterized in that: The method of use comprises the following steps: When welding a curved automobile pipe fitting (4), the pipe fitting (4) is placed in a notch (5) at the bottom of a support seat (2) so that the pipe fitting (4) can pass through two clamping plates (806) in the limiting assemblies (8). The pipe fitting (4) is horizontally moved so that the welding position of the pipe fitting (4) corresponds to the position of the welding assembly (10). Then, the second motor (803) is controlled to work so that it drives the screw rod (802) to rotate. Since the moving plate (804) is threadedly connected to the outside of the screw rod (802), the moving plate (804) is (804) can move upward and pull the hinged rods (805) on both sides, so that the middle part of the hinged rod (805) rotates around the end of the fixed seat (801), and the bottom end of the hinged rod (805) can push the clamping plate (806) to rotate during the deflection process, so that the two opposite clamping plates (806) are closed and the pipe fitting (4) is clamped, and the support arm (807) is used to support the clamping plate (806), thereby improving the stability of the clamping plate (806) on the pipe fitting (4); After the locking work of the pipe (4) is completed, the welding head (103) in the welding assembly (10) is aligned with the welding position of the pipe (4), and the first motor (603) is started. The output shaft of the first motor (603) drives the two driving gears (602) to rotate, and the driving gear (602) drives the driven gear (605) to rotate through the connecting gear (604). Since the two driven gears (605) rotate in the same direction and are meshed with the ring gear (901), the driven gear (605) can drive the ring gear (901) to rotate, and the ring gear (901) drives the slip ring (903) to slide in the slideway (11). The cross-sectional shape of the slideway (11) is T-shaped, so that the slideway (11) can play a role in supporting and limiting the slip ring (903), ensuring the stability of the rotation of the gear ring (901) and the ear plate (902). During the rotation of the gear ring (901), the welding assembly (10) can be driven to revolve around the center of the pipe fitting (4). At the same time, the welding assembly (10) works, and the welding gun (102) and the welding head (103) cooperate to automatically weld the connection of the pipe fitting (4). After the welding gun (102) and the welding head (103) rotate around the outer wall of the pipe fitting (4) for one circle, the first motor (603) is started to reverse, so that the welding assembly (10) can return to its original position; When welding pipes (4) of different specifications, in order to ensure the best welding distance between the welding head (103) and the outer wall of the pipe (4), the first motor (603) is controlled to work, so that the driven gear (605) in the adjustment component (6) drives the ring gear (901) to rotate, and the ring gear (901) drives the welding component (10) to rotate, so that the welding component (10) is not blocked by the limit component (8), and the first motor (603) is controlled to stop working, and then the welding head (103) is rotated. Since the welding head (103) is threadedly connected to the end of the welding gun (102), the welding head (103) can be freely extended and adjusted inside the welding gun (102), thereby facilitating the adjustment of the distance between the welding head (103) and the outer wall of the pipe (4); When removing the pipe fitting (4), the second motor (803) is controlled to reverse and drive the screw rod (802) to rotate. During the rotation of the screw rod (802), the movable plate (804) moves downward, and the movable plate (804) squeezes the two hinge rods (805) at the bottom to push the two clamping plates (806) to deflect, that is, the two clamping plates (806) can be opened, thereby releasing the locking state of the pipe fitting (4), and then the pipe fitting (4) can be removed.

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