Auxiliary welding clamp and spring barrel welding device

Abstract

The utility model relates to a welding auxiliary fixture and spring tube welding device, including base, turntable, outer positioning mechanism and inner clamping mechanism, the turntable is installed on the base through the turnover mechanism, the outer positioning mechanism and the inner clamping mechanism are both installed on the turntable, and the inner clamping mechanism is installed on the turntable. The outer positioning mechanism and the inner clamping mechanism jointly clamp and fix a to-be-welded part, and the outer positioning mechanism is configured to enable the projection of the butt weld center line of the to-be-welded part and the projection of the symmetrical center line of the outer positioning mechanism on a projection plane to coincide after the to-be-welded part is installed. According to the utility model, the spring tube to-be-welded parts can be stably fixed, the welding robot can accurately position a welding seam, the positions of the spring tube to-be-welded parts with different specifications can be consistent when the welding robot is used for welding, the repeated position searching process is reduced, the welding process of the welding robot is optimized, and the welding positioning accuracy and the production efficiency are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of rail vehicle bogie manufacturing equipment, in particular to a welding auxiliary fixture and a spring cylinder welding device. Background Art

[0002] Rail transit spring cylinders are components of rail transit bogie side beams and are one of the main load-bearing structures of the bogie frame. The installed train shock-absorbing axle box springs distribute the vehicle weight to each wheel, cushioning various vibrations during vehicle operation, ensuring more stable train operation and more comfortable passengers.

[0003] The spring cylinder is made of two identical U-shaped or semicircular corrugated steel plates with a symmetrical structure. It is welded by a robot instead of manual welding. In the past, the spring cylinder was placed on a fixed mold, and the contact part with the mold was the corrugated part. Due to the different specifications and sizes of the spring cylinders, the placement position is different, resulting in a high deviation rate during laser positioning; if it is placed freely and not fixed, it is easy to cause the robot positioning to fail; and manual flipping is required before welding, which reduces production efficiency. Utility Model Content

[0004] The main technical problem solved by the utility model is to provide a welding auxiliary clamp that can stably fix the spring cylinder waiting to be welded, and is conducive to the precise positioning of the weld seam by the welding robot, so that the spring cylinders waiting to be welded of different specifications can be positioned in the same manner when the welding robot is welding, thereby improving production efficiency. At the same time, a spring cylinder welding device using the auxiliary clamp is provided.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0006] A welding auxiliary fixture includes a base, a turntable, an external positioning mechanism and an internal clamping mechanism. The turntable is installed on the base through a flipping mechanism. The external positioning mechanism and the internal clamping mechanism are both installed on the turntable. The external positioning mechanism and the internal clamping mechanism jointly clamp and fix the workpiece to be welded. The external positioning mechanism is constructed so that after the workpiece to be welded is installed, the center line of the butt weld of the workpiece to be welded coincides with the projection of the symmetry center line of the external positioning mechanism on the projection surface.

[0007] Furthermore, the external positioning mechanism includes a first positioning device and a second positioning device, which clamp the middle part to be welded from the X direction and the Z direction respectively, and the symmetry center line of the first positioning device and the symmetry center line of the second positioning device both coincide with the projection of the butt weld center line of the part to be welded on the projection surface.

[0008] Furthermore, the first positioning device includes two upper and lower groups, which clamp the workpiece to be welded in the middle in the Z direction. Each group of the first positioning device is composed of two L-shaped first positioning seats, which are fixed on the turntable. The edge of the workpiece to be welded is clamped at the right-angle corner of the first positioning seat.

[0009] Furthermore, the second positioning device includes two groups, which clamp the middle part to be welded in the X direction. Each group of the second positioning device includes a T-shaped second positioning seat, which is fixed on the turntable. The edge of the part to be welded is clamped at the right angle corner of the second positioning seat.

[0010] Furthermore, the internal clamping mechanism includes two support columns, which extend along the Y direction parallel to the weld seam. The support columns are vertically installed on the turntable, and a clamping plate extending outward is installed on the outer end of the support column. The clamping plate is clamped on the outer end edge of the workpiece to be welded.

[0011] Furthermore, the flipping mechanism includes a fixed seat and a rotating shaft, the fixed seat is installed on the base, the rotating shaft is rotatably connected to the fixed seat, one end of the rotating shaft is connected to the power source, and the other end of the rotating shaft is fixedly connected to the turntable.

[0012] Furthermore, the outer positioning mechanism and / or the inner clamping mechanism are configured to be slidable in the radial direction on the turntable, and the outer positioning mechanism and the inner clamping mechanism are respectively moved synchronously by a synchronization mechanism.

[0013] Furthermore, a positioning assembly is installed between the base and the turntable, and the positioning assembly cooperates with the turntable to limit the rotation of the turntable during the welding process.

[0014] Furthermore, the positioning assembly includes a spring pin and a positioning seat, the spring pin is movably mounted on the positioning seat, the positioning seat is fixed on the base, two positioning pin holes are provided on the turntable, the spring pin is inserted into the positioning pin holes to realize the positioning of the turntable, and the positions of the two positioning pin holes are configured so that the two butt welds of the parts to be welded are in the same welding position after rotating 180°.

[0015] The second technical solution adopted in this utility model is:

[0016] A spring cylinder welding device comprises a workbench, a fully automatic welding robot and a welding auxiliary fixture for fixing the spring cylinder, wherein the welding auxiliary fixture is the welding auxiliary fixture described above.

[0017] In summary, the welding auxiliary fixture and spring cylinder welding device provided by the present invention have the following advantages compared with the prior art:

[0018] (1) When the utility model clamps the spring cylinder and other welding parts to be welded, the center line of the spring cylinder butt weld can be directly limited by the external positioning mechanism, which is conducive to the precise positioning of the weld by the manipulator in the welding robot, so that the spring cylinders of different specifications can be positioned in the same coordinate when the welding robot is welding, thereby reducing the repeated positioning process, optimizing the welding process of the welding robot, and improving the welding positioning accuracy of the welding robot, thus solving the problem of inconsistent positioning of the X-shaped groove or Y-shaped groove of various specifications of square or circular cylindrical structural products such as spring cylinders when the welding robot is welding.

[0019] (2) The utility model clamps and fixes the spring cylinder waiting for welding in the middle from both the inside and outside directions through the external positioning mechanism and the internal clamping mechanism. At the same time, the turntable can rotate 180 degrees, which not only allows the spring cylinder waiting for welding to be stably fixed on the turntable during welding, but also realizes the automatic flipping of the spring cylinder waiting for welding, so that the spring cylinder waiting for welding can be kept consistent in the Z direction (height direction) when the robot is welding, ensuring that the joint welds of the spring cylinder waiting for welding are in the same position, solidifying the weld position, greatly improving the production efficiency of the spring cylinder welding, and reducing the manufacturing cost.

[0020] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are part of this utility model and are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be derived from these drawings without inventive effort.

[0022] In the attached figure:

[0023] Figure 1 This is a schematic diagram of the fixture structure of the utility model Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the fixture structure of the utility model Figure 2 .

[0025] In the picture:

[0026] Spring cylinder 1, base 2, top plate 21, bottom plate 22, turntable 3, reinforcement rib 31, mounting cylinder 32, positioning pin hole 33, external positioning mechanism 4, first positioning device 41, first positioning seat 411, second positioning device 42, second positioning seat 421, internal clamping mechanism 5, support column 51, clamping plate 52, flipping mechanism 6, fixing seat 61, rotating shaft 62, positioning assembly 7, spring pin 71, positioning seat 72, anchor bolt 8, butt weld 9.

[0027] It should be noted that the drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0031] like Figure 1 and Figure 2 As shown, in this embodiment, a welding auxiliary clamp is provided, which is used for welding operations that require butt welding of two structurally symmetrical parts to be welded to form a complete product. In this embodiment, the part to be welded is a spring cylinder 1 as an example. The clamp serves as an auxiliary device of the spring cylinder 1 welding device and is used to fix the spring cylinder 1 during welding.

[0032] The spring cylinder 1 installed on the bogie of a railway vehicle is generally a cylindrical structure with a square or circular cross-section. It is made of two U-shaped or semicircular corrugated steel plates of the same structure that are butt-welded. When welding the spring cylinder 1 using a fully automatic welding robot, the two U-shaped or semicircular corrugated steel plates are fixed to the auxiliary fixture so that the two side edges of the two corrugated steel plates are butted together to form two upper and lower butt welds.

[0033] The welding auxiliary fixture provided in this embodiment includes a base 2, a turntable 3, an external positioning mechanism 4 and an internal clamping mechanism 5. The turntable 3 is mounted on the base 2 via a flip mechanism 6. The turntable 3 can rotate in the vertical direction. The external positioning mechanism 4 and the internal clamping mechanism 5 are both mounted on the turntable 3. The external positioning mechanism 4 and the internal clamping mechanism 5 clamp and fix the spring cylinder 1 in the middle from both the internal and external directions. The external positioning mechanism 4 is constructed so that after the two U-shaped or semicircular corrugated steel plates (i.e., the spring cylinder 1) are installed, the center line of the butt weld of the spring cylinder 1 coincides with the projection of the symmetrical center line of the external positioning mechanism 4 on the projection surface. Figure 1 As shown, the projection plane may refer to a horizontal plane.

[0034] When the clamp is used to clamp the spring cylinder 1 to be welded, the external positioning mechanism 4 can be directly used to define the center line of the spring cylinder 1 butt weld, which is beneficial for the manipulator in the welding robot to accurately position the weld, so that spring cylinders 1 of different specifications can be positioned consistently when the manipulator is welding, thereby improving the accuracy of the manipulator's welding positioning. At the same time, the external positioning mechanism 4 and the internal clamping mechanism 5 are used to clamp and fix the middle spring cylinder 1 from both the internal and external directions, and the turntable 3 can rotate 180 degrees at the same time, which not only allows the spring cylinder 1 to be stably fixed on the turntable 3, but also allows the spring cylinder 1 to be automatically flipped, so that the spring cylinder 1 is kept consistent in the Z direction (height direction) when the manipulator is welding, ensuring that the butt weld of the spring cylinder 1 is in a uniform position, solidifying the weld position, greatly improving the production efficiency of the spring cylinder 1 welding, and reducing the manufacturing cost.

[0035] In this embodiment, the base 2 is a box-shaped structure as a whole, which is spliced and welded by a top plate 21, a side plate (not shown in the figure) and a bottom plate 22. The bottom plate 22 is fixed to the welding workbench by multiple anchor bolts 8 to prevent the entire device from being displaced during flipping, positioning, and clamping.

[0036] In this embodiment, the turntable 3 and the top plate 21 of the base 2 are perpendicular to each other, that is, the turntable 3 is vertically installed on one side of the top plate 21, and the spring barrel 1 is extended in the horizontal direction (Y direction) relative to the turntable 3, that is, the spring barrel 1 is placed horizontally on the turntable 3, and the turntable 3 rotates in a vertical plane. After installation, the butt weld 9 of the spring barrel 1 is located directly above and directly below.

[0037] In this embodiment, the turntable 3 is preferably a square disk-shaped structure, although a circular disk-shaped structure may also be employed. Furthermore, to enhance the structural strength of the turntable 3, a plurality of reinforcing ribs 31 are preferably provided on the back side of the turntable 3 (i.e., the side facing away from the spring barrel 1). The reinforcing ribs 31 are generally triangular in structure, and the plurality of reinforcing ribs 31 are more preferably welded to the turntable 3 in a radial pattern.

[0038] In this embodiment, the flip mechanism 6 preferably includes a fixed base 61 and a rotating shaft 62. The fixed base 61 is mounted on the top plate 21 of the base 2. The rotating shaft 62 is rotatably connected to the fixed base 61. One end of the rotating shaft 62 is connected to the power source, and the other end of the rotating shaft 62 is fixedly connected to the turntable 3. Specifically, a cylindrical mounting tube 32 is provided in the center of the turntable 3. The rotating shaft 62 is inserted into the mounting tube 32 and connected via a key. When the flip mechanism 6 is in operation, it drives the turntable 3 to rotate forward and reverse, thereby driving the spring tube 1 to rotate forward and reverse. One end of each of the multiple reinforcing ribs 31 is fixedly connected to the central mounting tube 32, and the other end is arranged in a radial pattern on the outside of the mounting tube 32.

[0039] As an embodiment, the power source of the flip mechanism 6 is further preferably a flip motor, which is mounted on a fixed seat 61, and the output shaft of the flip motor is fixedly connected to the rotating shaft 62, or the output shaft of the flip motor is directly used as the rotating shaft 62, and the spring barrel 1 is automatically flipped 180 degrees by controlling the rotation of the flip motor.

[0040] As another embodiment, the turning mechanism 6 can be manually operated, that is, the operator can manually operate the rotating shaft 62 to rotate the rotating shaft 62 and thereby drive the spring barrel 1 to rotate.

[0041] In this embodiment, it is also preferred that a positioning assembly 7 is installed between the base 2 and the turntable 3. The positioning assembly 7 cooperates with the turntable 3 to limit the rotation of the turntable 3 during the welding process, thereby ensuring the welding quality of automatic welding.

[0042] Further preferably, the positioning assembly 7 includes a spring pin 71 and a positioning seat 72. The spring pin 71 is movably mounted on the positioning seat 72. The movable direction of the spring pin 71 is perpendicular to the turntable 3. The positioning seat 72 is fixed to the top plate 21 of the base 2. Two positioning pin holes 33 are provided on the turntable 3. The spring pin 71 is inserted into one of the positioning pin holes 33 to realize the positioning of the turntable 3. The positions of the two positioning pin holes 33 are configured so that the two butt welds of the spring cylinder 1 are in the same welding position after rotating 180°, that is, the two positioning pin holes 33 are symmetrically arranged in the radial direction. Figure 1 and Figure 2 As shown in the figure, when in the position, the spring pin 71 is inserted into the positioning pin hole 33 on the right side of the turntable 3. When the turntable 3 is flipped 180°, the positioning pin hole 33 on the left side will rotate to the position corresponding to the spring pin 71. In this way, it can be ensured that the turntable 3 will not rotate again during the welding process. At the same time, the spring pin 71 can cooperate with the positioning pin hole 33 to ensure that the butt weld of the spring cylinder 1 is still in the same welding position after rotating 180°, further reducing the difficulty of the manipulator in finding the position in the Z direction, improving the accuracy of finding the position, and also helping to improve the welding operation efficiency.

[0043] As another embodiment, the positioning component 7 can also be positioned by a cylinder, that is, a cylinder is installed on the top plate 21 of the base 2, the extended axis of the cylinder is perpendicular to the turntable 3, and the extended axis of the cylinder cooperates with the positioning pin hole 33 set on the turntable 3 to achieve the same positioning function as above.

[0044] In this embodiment, preferably, the external positioning mechanism 4 includes a first positioning device 41 and a second positioning device 42, wherein the first positioning device 41 and the second positioning device 42 clamp the middle spring tube 1 from the X direction and the Z direction respectively, that is, the direction of clamping the spring tube 1 from the outside is perpendicular, wherein the first positioning device 41 clamps the middle spring tube 1 from the upper and lower Z directions, and the second positioning device 42 clamps the middle spring tube 1 from the left and right X directions.

[0045] The symmetrical centerlines of the first positioning device 41 and the second positioning device 42 both coincide with the projection of the centerline of the butt weld 9 of the spring cylinder 1 on the projection plane. This helps secure the two butt welds 9 of the spring cylinder 1 after installation, facilitates precise positioning of the welds by the manipulator in the welding robot, and ensures consistent positioning of spring cylinders of different specifications during robot welding. This reduces repeated positioning, optimizes the robot welding process, and improves the robot's welding positioning accuracy. This solves the problem of inconsistent positioning of X-grooves or Y-grooves on various square or circular cylindrical structures, such as the spring cylinder 1, during robot welding.

[0046] In this embodiment, it is further preferred that the first positioning device 41 includes two groups, which are clamped on the outer surface of the middle spring tube 1 from the Z direction upward. Each group of first positioning devices 41 is composed of two L-shaped first positioning seats 411. The first positioning seats 411 are fixed to the turntable 3 by welding or bolts, and the edge of the spring tube 1 is clamped at the right-angle corner of the first positioning seat 411.

[0047] The second positioning device 42 also includes two groups, which are clamped on the outer surface of the middle spring barrel 1 from the left and right X-up. Each group of the second positioning device 42 includes a T-shaped second positioning seat 421. The second positioning seat 421 is fixed to the turntable 3 by welding or bolts. The edge of the spring barrel 1 is clamped at the right angle corner of the second positioning seat 421.

[0048] After the spring barrel 1 is positioned by the left and right sets of second positioning seats 421 and the upper and lower sets of first positioning seats 411, the upper and lower butt welds 9 of the spring barrel 1 can be ensured to be in a fixed position, that is, at a position that coincides with the symmetrical center line of the first positioning device 41 and the symmetrical center line of the second positioning device 42. The installation and positioning operations of the spring barrel 1 are simple and convenient.

[0049] This embodiment also provides another embodiment, in which the first positioning seat 411 and the second positioning seat 421 are both mounted on the turntable 3 using a sliding structure, and the two groups of first positioning seats 411 are connected to a synchronization mechanism (not shown in the figure), and the two groups of second positioning seats 421 are connected to another synchronization mechanism (not shown in the figure). The upper and lower groups of first positioning seats 411 and the left and right groups of second positioning seats 421 can all expand outward and converge toward the center synchronously, which facilitates adjustment according to the size of the spring barrel 1 and ensures that the upper and lower groups of first positioning seats 411 and the left and right groups of second positioning seats 421 are centrally symmetrical, and the upper and lower butt weld positions of the spring barrel 1 are solidified after installation. Among them, the synchronization mechanism can be a synchronization mechanism driven by a screw and a motor, and the two first positioning seats 411 or the two second positioning seats 421 are threadedly connected to the screw. When the motor is started, the screw rotates, causing the two first positioning seats 411 or the two second positioning seats 421 to expand outward and converge toward the center synchronously, thereby achieving automatic clamping and positioning of spring barrels 1 of different specifications.

[0050] In this embodiment, the internal clamping mechanism 5 includes two support columns 51 mounted perpendicularly to the turntable 3. The support columns 51 extend parallel to the butt weld 9 and are positioned within the spring barrel 1. Outwardly extending clamping plates 52 are mounted at the outer ends of the support columns 51. These clamping plates 52 clamp onto the outer edges of the spring barrel 1, limiting movement of the spring barrel 1 in the Y direction. The two support columns 51 and the two clamping plates 52 cooperate with the first and second positioning devices 41 and 42 to securely clamp the spring barrel 1 to the turntable 3. The internal clamping mechanism 5 prevents displacement of the spring barrel 1 in the X and Y directions during the flipping and welding processes.

[0051] This embodiment also provides another implementation in which two support columns 51 are slidably mounted on the turntable 3 and synchronized by a synchronization mechanism. This facilitates adjustment according to the size of the spring barrel 1 and ensures central symmetry between the two support columns 51. The synchronization mechanism can be a screw-driven synchronization mechanism, with the two support columns 51 threadedly connected to the screw. When the motor is activated, the screw rotates, causing the two support columns 51 to expand outward and converge toward the center simultaneously, achieving automatic clamping and positioning of spring barrels 1 of different sizes.

[0052] This embodiment also provides another implementation method, in which a retractable structure is adopted between the two clamping plates 52 and the ends of the corresponding support columns 51, so as to facilitate adjustment of the clamping position according to the length of the spring barrel 1 and ensure that the spring barrel 1 can be stably fixed.

[0053] The present invention also provides a spring cylinder welding device, comprising a workbench, a fully automatic welding robot (not shown), and a welding auxiliary fixture for securing the spring cylinder 1. The welding auxiliary fixture is the spring cylinder welding auxiliary fixture described above. Both the fully automatic welding robot and the welding auxiliary fixture are mounted on the workbench.

[0054] After the spring cylinder 1 is installed on the above-mentioned auxiliary fixture, the fully automatic welding robot automatically locates and welds the butt weld 9. After one butt weld 9 is welded, the spring cylinder 1 is flipped over so that the other butt weld 9 is flipped to the welding position, and the fully automatic welding robot then completes the welding of the other butt weld 9.

[0055] The above-mentioned solution has the following beneficial effects:

[0056] 1. When the device is used to clamp the spring cylinder 1 or other welded parts to be welded, the external positioning mechanism 4 can be directly used to define the center line of the butt weld of the spring cylinder 1, which is conducive to the precise positioning of the weld by the manipulator in the welding robot, so as to achieve consistent coordinate positioning of spring cylinders 1 of different specifications when the welding robot is welding, reduce repeated positioning processes, optimize the welding process of the welding robot, improve the welding positioning accuracy of the welding robot, and solve the problem of inconsistent positioning of X-shaped grooves or Y-shaped grooves of square or circular cylindrical structure products of various specifications such as spring cylinders 1 when the welding robot is welding.

[0057] 2. The device clamps and fixes the middle spring cylinder 1 from both the inside and outside directions through the external positioning mechanism 4 and the internal clamping mechanism 5. At the same time, the turntable 3 can rotate 180 degrees, which not only allows the spring cylinder 1 to be stably fixed on the turntable 3 during welding, but also realizes the automatic flipping of the spring cylinder 1, so that the Z direction (height direction) of the spring cylinder 1 is kept consistent during welding by the robot, ensuring that the butt welds of the spring cylinder 1 are in a unified position, solidifying the weld position, greatly improving the production efficiency of the welding of the spring cylinder 1, and reducing the manufacturing cost.

[0058] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments with equivalent changes using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A welding auxiliary fixture, characterized in that: It includes a base, a turntable, an external positioning mechanism and an internal clamping mechanism. The turntable is installed on the base through a flipping mechanism. The external positioning mechanism and the internal clamping mechanism are both installed on the turntable. The external positioning mechanism and the internal clamping mechanism jointly clamp and fix the parts to be welded. The external positioning mechanism is constructed so that after the parts to be welded are installed, the center line of the butt weld of the parts to be welded coincides with the projection of the symmetry center line of the external positioning mechanism on the projection surface.

2. The welding auxiliary fixture according to claim 1, characterized in that: The external positioning mechanism includes a first positioning device and a second positioning device, which clamp the middle part to be welded from the X direction and the Z direction respectively. The symmetry center line of the first positioning device and the symmetry center line of the second positioning device both coincide with the projection of the butt weld center line of the part to be welded on the projection surface.

3. The welding auxiliary fixture according to claim 2, characterized in that: The first positioning device includes two groups, upper and lower, which clamp the workpiece to be welded in the middle in the Z direction. Each group of the first positioning device consists of two L-shaped first positioning seats, which are fixed on the turntable. The edge of the workpiece to be welded is clamped at the right-angle corner of the first positioning seat.

4. The welding auxiliary fixture according to claim 2, characterized in that: The second positioning device includes two groups, which clamp the middle part to be welded in the X direction. Each group of the second positioning device includes a T-shaped second positioning seat, which is fixed on the turntable. The edge of the part to be welded is clamped at the right angle corner of the second positioning seat.

5. The welding auxiliary fixture according to claim 1, characterized in that: The internal clamping mechanism includes two support columns, which extend along the Y direction parallel to the weld seam. The support columns are vertically installed on the turntable. Clamping plates extending outward are installed on the outer ends of the support columns, and the clamping plates are clamped on the outer end edges of the parts to be welded.

6. The welding auxiliary fixture according to claim 1, characterized in that: The flip mechanism includes a fixed seat and a rotating shaft. The fixed seat is installed on the base. The rotating shaft is rotatably connected to the fixed seat. One end of the rotating shaft is connected to the power source, and the other end of the rotating shaft is fixedly connected to the turntable.

7. The welding auxiliary fixture according to claim 1, characterized in that: The outer positioning mechanism and / or the inner clamping mechanism are configured to be slidable in the radial direction on the turntable, and the outer positioning mechanism and the inner clamping mechanism are respectively moved synchronously by a synchronization mechanism.

8. The welding auxiliary fixture according to any one of claims 1 to 7, characterized in that: A positioning assembly is also installed between the base and the turntable, and the positioning assembly cooperates with the turntable to limit the rotation of the turntable during the welding process.

9. The welding auxiliary fixture according to claim 8, characterized in that: The positioning assembly includes a spring pin and a positioning seat. The spring pin is movably mounted on the positioning seat. The positioning seat is fixed on the base. Two positioning pin holes are provided on the turntable. The spring pin is inserted into the positioning pin holes to realize the positioning of the turntable. The positions of the two positioning pin holes are configured so that the two butt welds of the parts to be welded are in the same welding position after rotating 180°.

10. A spring tube welding device, characterized in that: The invention comprises a workbench, a fully automatic welding robot and a welding auxiliary fixture for fixing a spring cylinder, wherein the welding auxiliary fixture is the welding auxiliary fixture as described in any one of claims 1 to 9.

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