Automatic processing device and process for structural component of wind driven generator

Abstract

The invention relates to the technical field of automatic welding, and discloses an automatic machining device and process for a structural part of a wind driven generator, and the device comprises a base, a positioning frame and an automatic welding mechanism; the positioning frame is adjustably and rotatably mounted on the base, and a plurality of groups of positioning clamps are arranged at the upper part of the positioning frame; the positioning frame is provided with two sets of limiting chains, the two sets of limiting chains are used for positioning the multiple sets of first positioning clamps and the multiple sets of second positioning clamps respectively, and the positions of the single set of first positioning clamps and the single set of second positioning clamps can only be adjusted within the moving range of the limiting chains. According to the scheme, the clamping efficiency is improved, the position of the clamp is rapidly and accurately adjusted through the chain limiting design, repeated measuring and positioning are avoided, and the workpiece remodeling time is remarkably shortened; compatibility of a complex structure is achieved, a split type clamp is independently controlled, the special-shaped combination requirement of a structural part body and a side plate can be met, and the problem that a traditional tool is poor in universality is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic welding, in particular to an automatic processing device and process for a wind turbine structural member. BACKGROUND

[0002] The wind turbine blade directly affects the conversion efficiency of wind energy in the design of the wind turbine blade, directly affects its annual power generation, and is an important part of wind energy utilization. The blade is the most basic and key component of the wind turbine generator set, and its good design, reliable quality and superior performance are the decisive factors to ensure the normal and stable operation of the set.

[0003] The prior art provides a welding tool for a left front platform of a wind turbine, application number CN201910811383.3, the technical solution of which is a welding tool for a left front platform of a wind turbine, including a bottom frame, the bottom frame is a rectangular frame in cross section, a plurality of support pieces are fixedly arranged in the bottom frame, a positioning assembly is arranged at one end of the bottom frame in the length direction, the positioning assembly includes two groups of positioning seats and two groups of positioning strips, the positioning seat is fixedly connected with the bottom frame, the positioning strip is rotationally connected with the positioning seat, the positioning strip is parallel to the connecting beam, the two groups of positioning strips are respectively close to the first connecting plate and the fourth connecting plate, the positioning strip close to the first connecting plate is fixedly connected with a first positioning plate, the first positioning plate abuts with the inner side surface of the first connecting plate, the positioning strip close to the fourth connecting plate is fixedly connected with a third positioning plate and a fourth positioning plate, the third positioning plate abuts with the outer side surface of the third connecting plate, and the fourth positioning plate abuts with the inner side surface of the fourth connecting plate, so as to improve the welding quality.

[0004] However, the prior art, especially this scheme, still has the following problems: the existing tooling adopts a fixed bottom frame, which can only realize single-angle welding. For complex welds of wind turbine structural members, such as arc-shaped end plates and multi-surface welds, the workpiece needs to be repeatedly disassembled and turned over, resulting in low welding efficiency and easy introduction of positioning errors, poor multi-angle processing adaptability; the fixture position adjustment is tedious, and for wind turbine structural members, the complex structure has poor clamping compatibility and weak workpiece relative position stability, so we need an automatic processing device and process for a wind turbine structural member. SUMMARY

[0005] The purpose of the present application is to provide a technical solution that limits the position of multiple positioning clamps with a limiting chain and independently controls the split clamps to solve the problems in the prior art mentioned in the background.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] An automatic processing device for a wind turbine structural member, comprising:

[0008] a base, a positioning frame and an automatic welding mechanism;

[0009] The wind power generator structural member comprises a structural member body, a side plate and an end plate;

[0010] The positioning frame is adjustably rotatably mounted on the base, and a plurality of sets of positioning clamps one and positioning clamps two are arranged on the upper portion of the positioning frame, the positioning clamps one are used for clamping the structural member body, and the positioning clamps two are used for clamping the side plate;

[0011] Two sets of limiting chains are arranged on the positioning frame, and the two sets of limiting chains are respectively used for positioning the plurality of sets of positioning clamps one and the plurality of sets of positioning clamps two, and a single set of positioning clamps one and a single set of positioning clamps two can only be positionally adjusted within the active range of the limiting chains.

[0012] Preferably, the bottom of the positioning clamp one and the positioning clamp two is provided with a magnet block, and the positioning clamp one is adsorbed on the positioning frame through the magnet block.

[0013] Preferably, one side of the positioning clamp one and the positioning clamp two is provided with a connecting strip, and the positioning clamp one and the positioning clamp two are connected to the chain links of the limiting chains through the connecting strip.

[0014] Preferably, the base is further provided with a positioning mechanism for limiting the rotatable mounting of the positioning frame, and the positioning mechanism is used for locking and positioning the positioning frame according to a preset angle, so as to realize the locking and positioning of the wind power generator structural member clamped on the positioning frame.

[0015] Preferably, the two ends of the positioning frame are connected with adjusting rotating shafts, and the base is provided with two sets, and the positioning frame is rotatably mounted on the two sets of bases through the adjusting rotating shafts.

[0016] Preferably, the positioning mechanism comprises an adjusting locking disc and a locking rod, a locking groove for locking and clamping the locking rod is arranged on the adjusting locking disc, the adjusting locking disc is connected with the adjusting rotating shaft, and the locking rod is slidably mounted on the side surface of the base.

[0017] The side surface of the base is rotatably mounted with an adjusting lever for driving the locking rod, the adjusting lever is connected with the locking rod through a connecting rod, the two ends of the connecting rod are rotatably connected with the middle portion of the adjusting lever and the end portion of the locking rod respectively, and the base is provided with a reset spring for resetting the adjusting lever.

[0018] Preferably, the positioning mechanism comprises a servo motor, an encoder and a motor brake locking structure, the servo motor is mounted on the base, the output shaft of the servo motor is connected with the adjusting rotating shaft, the encoder is used for controlling the rotation angle of the adjusting rotating shaft through the servo motor, and the motor brake locking structure is used for locking the output shaft of the servo motor and the adjusting rotating shaft, so as to realize the angle locking of the positioning frame.

[0019] Preferably, one end of the positioning frame is provided with a supporting clamp, and the other end of the positioning frame is provided with a positioning clamp three for corresponding to the arc-shaped end plate.

[0020] Preferably, the structure body is further provided with an inner buckle, and the positioning clamp one and the positioning clamp two are connected with an extension clamp rod for pressing the inner buckle.

[0021] The application also provides an automatic processing technology, which adopts the automatic processing device of the wind turbine structure part and comprises the following steps.

[0022] Step S1, workpiece pre-positioning;

[0023] Step S2, clamp position adjustment;

[0024] According to the size of the workpiece, the positions of the positioning clamp one and the positioning clamp two are adjusted by sliding along the movable range of the limiting chain, so that they are accurately matched with the workpiece within the limiting range of the chain, and rapid positioning and fixing are realized.

[0025] Step S3, angle locking of the positioning frame;

[0026] Step S4, automatic welding;

[0027] Step S5, workpiece disassembly and resetting.

[0028] The application has the following advantages compared with the prior art.

[0029] The application realizes multi-angle adjustment of the workpiece and meets the multi-directional processing requirements of the automatic welding mechanism through multi-angle processing adaptation and rotatable installation of the positioning frame on the base; the independent positioning clamp one is arranged to clamp the structure body, and the positioning clamp two is arranged to clamp the side plate, so that the split positioning of the core component is realized; the flexible position control is realized through the two groups of limiting chains that respectively constrain the multiple groups of clamps one and clamps two, so that the single group of clamps can only slide within the limiting range of the chain, and the position can be adjusted and not over-travel.

[0030] The clamping efficiency is improved, the chain limiting design makes the clamp position adjustment fast and accurate, repeated measurement and positioning are avoided, and the workpiece changeover time is significantly shortened; the compatibility of complex structures is realized through independent control of the split clamps, the special-shaped combination requirements of the structure body and the side plate are met, and the poor universality of the traditional tooling is solved; the processing precision is guaranteed through the cooperative design of the rotating frame and the chain limiting, so that the relative position of the workpiece is kept stable during the rotary welding process, and the processing error is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 This is one of the structural diagrams of the automated processing device of the present invention;

[0032] Figure 2 This is the second structural diagram of the automated processing device of the present invention;

[0033] Figure 3 It is a schematic diagram of the top view of the automated processing device of the present invention;

[0034] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0035] Figure 5 It is a side structural schematic diagram of the automated processing device of the present invention;

[0036] Figure 6 A schematic diagram of the specific structure of the positioning mechanism in an embodiment of the present invention;

[0037] Figure 7 Schematic diagram of the structure of a wind turbine generator according to an embodiment of the present invention.

[0038] In the picture:

[0039] 11. Base; 12. Positioning frame; 13. Support fixture; 14. Positioning fixture 1; 15. Positioning fixture 2; 16. Positioning fixture 3; 17. Magnet block; 18. Limiting chain; 19. Positioning shaft; 110. Connecting bar; 111. Extension clamp;

[0040] 2. Positioning mechanism; 21. Adjusting shaft; 22. Adjusting locking plate; 23. Locking rod; 24. Adjusting lever; 25. Return spring; 26. Connecting rod; 27. Locking slot;

[0041] 31. Main body of the structural member; 32. Side panels; 33. End panels; 34. Internal fasteners. DETAILED DESCRIPTION

[0042] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. Furthermore, features described for some examples may be combined in other examples.

[0043] The invention provides Figures 1 to 7 As shown, an automated processing device for wind turbine structural parts includes:

[0044] The base 11, the positioning frame 12 and the automatic welding mechanism;

[0045] The wind power generator structural member comprises a structural member body 31, a side plate 32 and an end plate 33;

[0046] The positioning frame 12 is adjustably rotatably installed on the base 11, and a plurality of sets of positioning clamps one 14 and positioning clamps two 15 are arranged on the upper portion of the positioning frame 12, the positioning clamps one 14 are used for clamping the structural member body 31, and the positioning clamps two 15 are used for clamping the side plate 32.

[0047] Two sets of limiting chains 18 are arranged on the positioning frame 12, and the two sets of limiting chains 18 are respectively used for positioning the plurality of sets of positioning clamps one 14 and the plurality of sets of positioning clamps two 15, a single set of positioning clamps one 14 and positioning clamps two 15 can only be positionally adjusted within the active range of the limiting chain 18, and the two ends of the limiting chain 18 are provided with positioning shafts 19, and the limiting chain 18 is installed on the positioning frame 12 through the positioning shafts 19 at the two ends.

[0048] Working principle: multi-angle processing adaptation, the positioning frame 12 is rotatably installed on the base 11, realizing multi-angle adjustment of the workpiece and adapting to the multi-directional processing needs of the automatic welding mechanism; modular classification clamping, the positioning clamps one 14 are independently arranged to clamp the structural member body 31, and the positioning clamps two 15 are independently arranged to clamp the side plate 32, realizing separate positioning of the core component; flexible position control, the two sets of limiting chains 18 respectively constrain the plurality of sets of clamps one and clamps two, so that a single set of clamps can only slide within the range limited by the chain, ensuring that the position is adjustable and does not overtravel.

[0049] Clamping efficiency is improved, chain limiting design enables quick and accurate clamping position adjustment, avoiding repeated measurement and positioning, and significantly shortening the workpiece changeover time; complex structure compatibility, independent control of the split clamps can adapt to the special-shaped combination needs of the structural member body 31 and the side plate 32, solving the problem of poor universality of traditional tooling; processing precision is guaranteed, the cooperative design of the rotating frame and the chain limiting ensures that the workpiece maintains a stable relative position during the rotary welding process, reducing processing errors.

[0050] As shown in Figure 1 and Figure 2 , regarding the arrangement mode of the positioning clamps one 14 and the positioning clamps two 15 on the positioning frame 12, the bottom of the positioning clamps one 14 and the positioning clamps two 15 is provided with a magnet block 17, and the positioning clamps one 14 is adsorbed on the positioning frame 12 through the magnet block 17.

[0051] As shown in Figure 3 and Figure 4As shown, regarding the connection mode of the positioning clamps 14, 15 and the limiting chain 18, one side of the positioning clamps 14 and 15 is provided with a connecting strip 110, and the positioning clamps 14 and 15 are connected to the chain links of the limiting chain 18 through the connecting strip 110.

[0052] As shown in Figure 5 and Figure 6 regarding the specific structure of the positioning mechanism 2, the base 11 is further provided with a positioning mechanism 2 for limiting the rotational installation of the positioning frame 12, and the positioning mechanism 2 is used for locking and positioning the positioning frame 12 at a preset angle, so as to realize the locking and positioning of the wind turbine structural member clamped on the positioning frame 12.

[0053] Specifically, the installation mode of the positioning frame 12 on the base 11 is as shown in Figure 1 and Figure 2 The two ends of the positioning frame 12 are connected with an adjusting rotating shaft 21, and the base 11 is provided with two groups, and the positioning frame 12 is rotatably installed on the two groups of bases 11 through the adjusting rotating shaft 21.

[0054] Regarding the first embodiment of the positioning mechanism 2, as shown in Figure 5 and Figure 6 The positioning mechanism 2 includes an adjusting locking disc 22 and a locking rod 23, the adjusting locking disc 22 is provided with a locking groove 27 for clamping and locking the locking rod 23, the adjusting locking disc 22 is connected to the adjusting rotating shaft 21, and the locking rod 23 is slidably installed on the side of the base 11.

[0055] The side of the base 11 is rotatably installed with an adjusting lever 24 for driving the locking rod 23, the adjusting lever 24 is connected to the locking rod 23 through a connecting rod 26, the two ends of the connecting rod 26 are rotatably connected to the middle part of the adjusting lever 24 and the end part of the locking rod 23 respectively, and the base 11 is provided with a reset spring 25 for resetting the adjusting lever 24.

[0056] Regarding the second embodiment of the positioning mechanism 2, which is not shown in the figure, the positioning mechanism 2 includes a servo motor, an encoder and a motor brake locking structure, the servo motor is installed on the base 11, and the output shaft of the servo motor is connected to the adjusting rotating shaft 21, the encoder is used for controlling the rotation angle of the adjusting rotating shaft 21 through the servo motor, and the motor brake locking structure is used for locking the output shaft of the servo motor and the adjusting rotating shaft 21, so as to realize the angle locking of the positioning frame 12.

[0057] As shown in Figure 3 and Figure 7As shown, one end of the positioning frame 12 is provided with a support clamp 13, and the other end of the positioning frame 12 is provided with a positioning clamp three 16 for corresponding arc-shaped end plates 33, and the support clamp 13 and the positioning clamp two 15 are clamped from both ends of the structural member body 31. The structural member body 31 is also provided with an inner buckle 34, and the positioning clamp one 14 and the positioning clamp two 15 are connected with an extension clamp rod 111 for pressing and fixing the inner buckle 34.

[0058] The application also provides an automatic processing technology, which adopts the automatic processing device of the wind turbine structural member, and includes the following steps:

[0059] Step S1, workpiece pre-positioning;

[0060] The wind turbine structural member body 31 is placed on the positioning frame 12, and the body is clamped and fixed by a plurality of positioning clamps one 14; the side plate 32 is clamped on the side of the structural member body 31 by the positioning clamp two 15, and the end plate 33 is positioned at the arc-shaped end of the body by the positioning clamp three 16; the support clamp 13 is used to provide auxiliary support from the other end of the structural member body 31 to ensure the overall stability; if the structural member contains an inner buckle 34, the inner buckle 34 is pressed and fixed by the extension clamp rod 111;

[0061] Step S2, clamp position adjustment;

[0062] According to the size of the workpiece, the positions of the positioning clamps one 14 and the positioning clamps two 15 are adjusted along the movable range of the limiting chain 18 to accurately adapt to the workpiece within the limiting range of the chain; the magnet block 17 at the bottom of the clamp is adsorbed on the positioning frame 12 to realize quick positioning and fixing;

[0063] Step S3, angle locking of the positioning frame 12;

[0064] Scheme one (mechanical locking type):

[0065] The positioning frame 12 is fixed at a preset angle by adjusting the lever 24 to drive the locking rod 23 to be clamped into the locking groove 27 of the adjusting locking disc 22;

[0066] After the welding is completed, the adjusting lever 24 is pulled to release the locking rod 23, and the reset spring 25 assists in resetting;

[0067] Scheme two (electric locking type):

[0068] The positioning frame 12 is rotated to the target angle by driving the adjusting shaft 21 by the servo motor, the encoder monitors the angle position in real time, the motor brake locking structure is started, and the adjusting shaft 21 and the frame position are fixed;

[0069] Step S4, automatic welding;

[0070] Start the automatic welding mechanism to weld the joints of the structural body 31, the side plate 32 and the end plate 33; after completing the welding of one angle, release the positioning mechanism 2 as needed, rotate the positioning frame 12 to the next preset angle and re-lock; repeat the welding process until all the welds are completed;

[0071] Step S5, workpiece disassembly and resetting;

[0072] Release all the positioning clamps and the supporting clamp 13, and take down the completed structural part; reset the clamps on the limiting chain 18 to the initial position, ready for the next round of processing;

[0073] In summary, the present application also has the following comprehensive effects:

[0074] Modular clamping: the structural body 31 is fixed by multiple sets of positioning clamps one 14, the side plate 32 is clamped by positioning clamps two 15, and the arc-shaped end plate 33 is positioned by positioning clamps three 16; the supporting clamp 13 provides auxiliary support at the other end of the structural part, forming a double-end stable structure; if there is an inner buckle 34, it is fixed by extending the clamp rod 111;

[0075] Flexible position control mechanism: all the clamps are provided with magnet blocks 17 at the bottom, which are directly adsorbed on the positioning frame 12 to realize quick installation; the clamps are connected by the connecting strips 110 and the chain links of the limiting chain 18, and can only slide within the range limited by the chain, ensuring that the position is adjustable and not over-traveling;

[0076] Multi-angle welding positioning: mechanical locking scheme: rotate the adjusting lever 24, push the locking rod 23 into the locking groove 27 of the adjusting locking disc 22, fix the angle of the positioning frame 12, and the reset spring 25 automatically resets the locking rod 23 when the release lever is released; electric locking scheme: the servo motor drives the adjusting shaft 21 to rotate the frame to the target angle, the encoder feedbacks the accuracy in real time, and the motor brake locks the output shaft; both schemes realize accurate locking of the preset angle, meeting the multi-face welding requirements.

[0077] Automatic welding process: after the workpiece is clamped, start the automatic welding mechanism; after completing one welding surface, release the positioning mechanism 2, rotate the frame to the next angle, re-lock and continue welding until full coverage.

[0078] The clamping efficiency is improved, the magnetic clamping and limiting chain 18 are designed, the clamping position is quickly adjusted and fixed, different sizes of workpieces are adapted, and the type changing time is reduced; the welding precision and stability are enhanced, the mechanical or electric dual-mode angle locking mechanism provides high-rigidity frame positioning, avoids workpiece displacement in the welding process, and guarantees the welding quality; the inner buckle 34 is fixed synchronously through the extension of the clamping rod 111, and assembly errors of complex structural parts are avoided; the process flexibility is optimized, the positioning frame 12 is fully-angle adjustable, multi-angle continuous operation without dead angle is realized by cooperating with the automatic welding mechanism, workpiece overturning and repeated clamping are reduced; the support clamp 13 and the positioning clamp 16 are adapted to the arc-shaped end plate 33, and the design ensures stable clamping of special-shaped parts; man-machine cooperation is simplified; the mechanical locking scheme realizes single-hand operation through the lever mechanism, and reduces the artificial locking strength; the electric scheme integrates an encoder feedback to realize digital and accurate control of the angle, and reduces human intervention. Through the cooperative design of the modular clamps, magnetic quick installation, limiting chain 18 and multi-mode angle locking mechanism, the device solves the problems of complicated clamping and many welding dead angles of large special-shaped structural parts of wind turbines, and significantly improves the processing efficiency and precision.

[0079] The above describes the embodiments of the present application, but the present application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative but not restrictive. Those skilled in the art can make many forms under the inspiration of the present application, which are all within the protection scope of the present application.

Claims

1. An automated processing device for wind turbine structural parts, characterized in that: include: A base (11), a positioning frame (12) and an automated welding mechanism; The wind turbine structural member comprises a structural member body (31), a side plate (32) and an end plate (33); The positioning frame (12) is rotatably mounted on the base (11), and a plurality of positioning fixtures (14) and (15) are provided on the upper portion of the positioning frame (12). The positioning fixture (14) is used to clamp the main body (31) of the structural member, and the positioning fixture (15) is used to clamp the side plate (32). Two groups of limiting chains (18) are provided on the positioning frame (12), and the two groups of limiting chains (18) are used to position multiple groups of positioning fixtures one (14) and multiple groups of positioning fixtures two (15) respectively. The positions of the single group of positioning fixtures one (14) and the single group of positioning fixtures two (15) can only be adjusted within the range of movement of the limiting chains (18).

2. The automated processing device for wind turbine structural parts according to claim 1, characterized in that: The bottoms of the positioning fixture 1 (14) and the positioning fixture 2 (15) are both provided with magnet blocks (17), and the positioning fixture 1 (14) is adsorbed on the positioning frame (12) through the magnet blocks (17).

3. The automated processing device for wind turbine structural parts according to claim 2, characterized in that: A connecting bar (110) is provided on one side of the positioning clamp 1 (14) and the positioning clamp 2 (15), and the positioning clamp 1 (14) and the positioning clamp 2 (15) are connected to the link of the limiting chain (18) through the connecting bar (110).

4. The automated processing device for wind turbine structural parts according to claim 1, characterized in that: The base (11) is also provided with a positioning mechanism (2) for limiting the rotational installation of the positioning frame (12). The positioning mechanism (2) is used to lock and position the positioning frame (12) according to a preset angle, thereby achieving locking and positioning of the wind turbine structure clamped on the positioning frame (12).

5. The automated processing device for wind turbine structural parts according to claim 4, characterized in that: Both ends of the positioning frame (12) are connected with adjustment shafts (21), and the base (11) is provided with two groups. The positioning frame (12) is rotatably mounted on the two groups of bases (11) through the adjustment shafts (21).

6. The automated processing device for wind turbine structural parts according to claim 5, characterized in that: The positioning mechanism (2) comprises an adjusting locking disk (22) and a locking rod (23); a locking groove (27) for locking the locking rod (23) is provided on the adjusting locking disk (22); the adjusting locking disk (22) is connected to the adjusting rotating shaft (21); and the locking rod (23) is slidably mounted on the side of the base (11); An adjusting lever (24) for driving a locking rod (23) is rotatably mounted on the side of the base (11). The adjusting lever (24) is connected to the locking rod (23) via a connecting rod (26). The two ends of the connecting rod (26) are rotatably connected to the middle of the adjusting lever (24) and the end of the locking rod (23). A reset spring (25) for resetting the adjusting lever (24) is provided on the base (11).

7. The automated processing device for wind turbine structural parts according to claim 5, characterized in that: The positioning mechanism (2) includes a servo motor, an encoder, and a motor brake locking structure. The servo motor is mounted on a base (11), and an output shaft of the servo motor is connected to an adjusting shaft (21). The encoder is used to control the rotation angle of the adjusting shaft (21) through the servo motor. The motor brake locking structure is used to lock the output shaft of the servo motor and the adjusting shaft (21) to achieve angle locking of the positioning frame (12).

8. The automated processing device for wind turbine structural parts according to claim 1, characterized in that: One end of the positioning frame (12) is provided with a supporting fixture (13), and the other end of the positioning frame (12) is provided with a positioning fixture three (16). The positioning fixture three (16) is used to correspond to the arc-shaped end plate (33). The supporting fixture (13) and the positioning fixture two (15) are clamped from both ends of the structural component body (31).

9. The automated processing device for wind turbine structural parts according to claim 2, characterized in that: The structural member body (31) is also provided with an inner fastener (34), and the positioning clamp 1 (14) and the positioning clamp 2 (15) are connected with an extended clamp rod (111), and the extended clamp rod (111) is used to press and fix the inner fastener (34).

10. An automated processing technology, characterized in that: An automated processing device for a wind turbine structural member according to any one of claims 1 to 9 comprises the following steps: Step S1, pre-positioning the workpiece; Step S2, adjusting the position of the fixture; According to the size of the workpiece, the positions of the first positioning fixture (14) and the second positioning fixture (15) are slidably adjusted along the movable range of the limit chain (18) so that they can accurately fit the workpiece within the chain limit range to achieve rapid positioning and fixing; Step S3, the positioning frame (12) is locked at an angle; Step S4: automated welding; Step S5: disassembling and resetting the workpiece.

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