Welding fixture for rear lower sheet body of automobile auxiliary frame

Abstract

The utility model relates to a welding fixture for a rear lower sheet body of an automobile auxiliary frame. Comprising an auxiliary frame rear lower sheet body fixing assembly, a collision support lower connecting plate assembly fixing assembly, a control arm mounting assembly fixing assembly, a mounting table, a bearing auxiliary frame rear lower sheet body, an auxiliary frame rear lower sheet body fixing assembly, a collision support lower connecting plate assembly fixing assembly and a control arm mounting assembly fixing assembly. The auxiliary frame rear lower piece body, the collision support lower connecting plate assembly, the control arm installation assembly fixing assembly and the supporting bent arm assembly are fixed and pressed, it is guaranteed that the positions of all the assemblies are stable in the welding process, and welding of the auxiliary frame rear lower piece body assembly can be completed through one set of clamp. And a plurality of sets of clamps do not need to be replaced to weld each component, so that the welding procedures are reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts manufacturing, in particular to a welding fixture for a rear lower sheet of an automobile auxiliary frame. Background Art

[0002] With the rapid development of new energy vehicles, the iteration speed of new energy vehicles is increasing, and the battery needs are increasing, resulting in the continuous increase in battery weight and volume. In order to adapt to the results of new energy vehicles, the vehicle chassis needs to be improved and designed. The redesigned vehicle chassis needs to be matched with a new processing technology. Therefore, a welding fixture for the rear lower sheet of an automobile subframe is designed to adapt to the new automobile chassis welding process. Summary of the invention

[0003] In order to solve the above technical problems, the utility model proposes a welding fixture for the rear lower plate of an automobile subframe. The technical problem to be solved by the utility model is achieved by the following technical solutions:

[0004] A welding fixture for a rear lower plate of an automobile subframe, comprising:

[0005] A sub-frame rear lower sheet fixing assembly is used to position the sub-frame rear lower sheet circumferentially and fix the sub-frame rear lower sheet;

[0006] The collision bracket lower connecting plate assembly fixing components are symmetrically arranged in two in the horizontal direction, and fix the upper and lower ends of the collision bracket lower connecting plate assembly;

[0007] The control arm mounting assembly fixing components are symmetrically arranged in two in the horizontal direction, and press the upper plate body and the lower plate body of the control arm mounting assembly tightly, so that the upper plate body and the lower plate body of the control arm mounting assembly fit together and are fixed in position;

[0008] The mounting platform carries the rear lower piece of the subframe, the rear lower piece of the subframe fixing assembly, the lower connecting plate assembly fixing assembly of the collision bracket, and the control arm mounting assembly fixing assembly.

[0009] As a further improvement of the present invention, the sub-frame rear lower plate fixing assembly includes a No. 1 limiting device for positioning and pressing the front and rear ends of the sub-frame rear lower plate, and also includes a No. 2 limiting device for positioning and pressing both sides of the sub-frame rear lower plate.

[0010] As a further improvement of the utility model, the No. 1 limiting device includes two groups of No. 1 support blocks which are arranged on the mounting platform and are symmetrically distributed along the width direction of the mounting platform to fit with the lower surface of the rear lower sheet of the sub-frame to support the front and rear ends of the rear lower sheet of the sub-frame, and the No. 1 support blocks are each matched with a No. 1 clamping block on the upper surface of the rear lower sheet of the sub-frame, and the No. 1 clamping block is each matched with a No. 1 flip cylinder fixed on the mounting platform.

[0011] As a further improvement of the present invention, one group of the No. 1 support blocks has two symmetrically arranged along the length direction of the mounting platform, and the other group has two parallelly arranged along the width direction of the mounting platform, wherein a No. 1 locating pin is provided on the mounting platform close to the side of the No. 1 support block arranged parallel to the width direction of the mounting platform, and the No. 2 support block is also provided on the side of the mounting platform close to the No. 1 locating pin, and the No. 2 support block is symmetrically arranged along the length direction of the mounting platform to support both sides of the rear lower sheet of the sub-frame, and the No. 2 support blocks are each matched with a No. 2 clamping block, one of the No. 2 clamping blocks is connected to a No. 2 flip cylinder, and the other is connected to the No. 1 flip cylinder close to the side of the No. 1 locating pin.

[0012] As a further improvement of the utility model, the No. 2 limiting device includes a No. 1 support column for supporting both sides of the rear lower plate of the sub-frame, and also includes a No. 3 clamping block that cooperates with the No. 1 support column to press the rear lower plate of the sub-frame, and the No. 3 clamping block is cooperated with a No. 3 flip cylinder fixed on the mounting table.

[0013] The beneficial effects of the utility model are as follows: the utility model fixes and presses the rear lower plate of the auxiliary frame, the lower connecting plate assembly of the collision bracket, the fixing assembly of the control arm mounting assembly and the supporting bent arm assembly, thereby ensuring the stability of the position of each assembly during welding; the welding of the rear lower plate assembly of the auxiliary frame can be completed by using one set of clamps, and there is no need to replace multiple sets of clamps to weld each assembly, thereby reducing the welding process and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 The three-dimensional structure of the utility model is shown in FIG. Figure 1 ;

[0016] Figure 2 The three-dimensional structure of the utility model is shown in FIG. Figure 2 ;

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the rear lower plate fixing assembly of the auxiliary frame of the utility model;

[0018] Figure 4 It is a three-dimensional structural schematic diagram of the second limiting device of the utility model;

[0019] Figure 5 The three-dimensional structure diagram of the fixing component of the lower connecting plate assembly of the collision bracket of the utility model is shown in FIG. Figure 1 ;

[0020] Figure 6 The three-dimensional structure diagram of the fixing component of the lower connecting plate assembly of the collision bracket of the utility model is shown in FIG. Figure 2 ;

[0021] Figure 7 This is a schematic diagram of the three-dimensional structure of cylinder No. 1 of the utility model;

[0022] Figure 8 The three-dimensional structure diagram of the control arm mounting assembly fixing component of the utility model is shown in FIG. Figure 1 ;

[0023] Fig. 9 The three-dimensional structure diagram of the control arm mounting assembly fixing component of the utility model is shown in FIG. Figure 2 ;

[0024] Fig.10 It is a schematic diagram of the three-dimensional structure of the No. 2 cylinder of the utility model;

[0025] Fig.11 It is a schematic diagram of the three-dimensional structure of the No. 6 flip cylinder of the utility model.

[0026] As shown in the figure: 1. Sub-frame rear lower plate fixing assembly; 2. Collision bracket lower connecting plate assembly fixing assembly; 3. Control arm mounting assembly fixing assembly; 4. Mounting table; 5. No. 5 support block; 6. No. 6 positioning pin; 7. No. 4 cylinder; 8. No. 6 flip cylinder; 9. No. 7 clamping block; 10. No. 1 adapter; 11. No. 1 limit device; 12. No. 2 limit device; 13. No. 5 cylinder; 14. Positioning column; 15. No. 9 clamping block; 16. No. 2 adapter; 17. No. 6 support block; 111. No. 1 support block; 112. No. 1 clamping block; 113. No. 1 flip cylinder; 114. No. 1 positioning pin; 115. No. 2 support block; 116. No. 2 clamping block; 1 17. No. 2 flip cylinder; 121. No. 1 support column; 122. No. 3 clamping block; 123. No. 3 flip cylinder; 21. Support block; 22. No. 8 positioning pin; 23. No. 4 clamping block; 24. No. 4 flip cylinder; 25. No. 5 clamping block; 26. No. 5 flip cylinder; 27. No. 2 positioning pin; 28. No. 1 cylinder; 29. ​​No. 3 positioning pin; 251. Ring part; 31. No. 4 support block; 32. No. 4 positioning pin; 33. No. 6 clamping block; 34. No. 5 positioning pin; 35. No. 2 cylinder; 36. Moving unit; 37. No. 8 clamping block; 38. No. 7 positioning pin; 361. Slide; 362. Bracket; 363. No. 3 cylinder; 364. Support column. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described more clearly and completely below in conjunction with the drawings in the embodiments. Of course, the described embodiments are only a part of the present invention but not all of it. Based on this embodiment, other embodiments obtained by those skilled in the art without creative labor are all within the protection scope of the present invention.

[0028] like Figures 1 to 11 As shown, a welding fixture for the rear lower plate of an automobile subframe comprises:

[0029] A sub-frame rear lower sheet fixing assembly 1 is used to position the sub-frame rear lower sheet circumferentially and fix the sub-frame rear lower sheet;

[0030] The collision bracket lower connecting plate assembly fixing components 2 are symmetrically arranged in two in the horizontal direction, and fix the upper and lower ends of the collision bracket lower connecting plate assembly;

[0031] The control arm mounting assembly fixing assembly 3 is symmetrically arranged in two in the horizontal direction, and presses the upper plate body and the lower plate body of the control arm mounting assembly so that the upper plate body and the lower plate body of the control arm mounting assembly fit together and are fixed in position;

[0032] The mounting platform 4 supports the rear lower plate of the sub-frame, the rear lower plate fixing component 1 of the sub-frame, the lower connecting plate assembly fixing component 2 of the collision bracket, and the control arm mounting assembly fixing component 3.

[0033] The sub-frame rear lower plate fixing assembly 1 includes a first limiting device 11 for positioning and pressing the front and rear ends of the sub-frame rear lower plate, and also includes a second limiting device 12 for positioning and pressing both sides of the sub-frame rear lower plate.

[0034] The No. 1 limiting device 11 includes two groups of No. 1 support blocks 111 that are arranged on the mounting platform 4 and symmetrically distributed along the width direction of the mounting platform 4 to fit with the lower surface of the rear lower plate of the sub-frame to support the front and rear ends of the rear lower plate of the sub-frame. The No. 1 support blocks 111 are all equipped with No. 1 clamping blocks 112 that clamp the upper surface of the rear lower plate of the sub-frame, and the No. 1 clamping blocks 112 are all equipped with No. 1 flip cylinders 113 fixed on the mounting platform 4.

[0035] Among the No. 1 support blocks 111, one group has two symmetrically arranged along the length direction of the mounting platform 4, and the other group has two parallelly arranged along the width direction of the mounting platform 4, wherein a No. 1 positioning pin 114 symmetrically arranged along the length direction of the mounting platform 4 to cooperate with the rear lower sheet of the sub-frame is provided on the side of the No. 1 support block 111 on the mounting platform 4 close to the No. 1 support block 111 arranged parallel to the width direction of the mounting platform 4, and a No. 2 support block 115 symmetrically arranged along the length direction of the mounting platform 4 to support both sides of the rear lower sheet of the sub-frame is also provided on the side of the No. 1 positioning pin 114 of the mounting platform 4, and the No. 2 support blocks 115 are all matched with No. 2 clamping blocks 116, one of the No. 2 clamping blocks 116 is connected to the No. 2 flip cylinder 117, and the other is connected to the No. 1 flip cylinder 113 close to the side of the No. 1 positioning pin 114; Figures 1 to 3As shown, one of the No. 1 flip cylinders 113 is tilted, and the No. 1 pressing block 112 matched with the No. 1 flip cylinder 113 and the No. 1 support block 111 arranged parallel to the width direction of the mounting platform 4 and close to the No. 2 limiting device 12 cooperate to press the rear lower plate of the sub-frame.

[0036] The No. 2 clamping block 116 cooperating with the No. 1 flip cylinder 113 is connected to the No. 1 flip cylinder 113 through the No. 1 adapter frame 10 with an L-shaped cross-section. The end of the No. 1 adapter frame 10 away from the No. 2 clamping block 116 is used to fix the No. 1 clamping block 112; the No. 1 support block 111 and the No. 2 support block 115 are in contact with the lower end surface of the rear lower sheet of the sub-frame, and support the front and rear ends of the rear lower sheet of the sub-frame. At the same time, the No. 1 positioning pin 114 positions the rear lower sheet of the sub-frame, and the No. 1 flip cylinder 113 and the No. 2 flip cylinder 117 drive the No. 1 clamping block 112 and the No. 2 clamping block 116 to clamp the upper end surface of the rear lower sheet of the sub-frame.

[0037] The No. 2 limiting device 12 includes a No. 1 support column 121 for supporting both sides of the rear lower plate of the sub-frame, and also includes a No. 3 clamping block 122 that cooperates with the No. 1 support column 121 to press the rear lower plate of the sub-frame, and the No. 3 clamping block 122 is equipped with a No. 3 turning cylinder 123 fixed on the mounting platform 4; the No. 1 support column 121 is in contact with the lower end surface of the rear lower plate of the sub-frame, and the No. 3 turning cylinder 123 drives the No. 3 clamping block 122 to press.

[0038] The collision bracket lower connecting plate assembly fixing component 2 includes two groups of No. 3 support blocks 21 symmetrically arranged along the width direction of the mounting platform 4 to support the lower plate body of the collision bracket lower connecting plate, and each group of No. 3 support blocks 21 are distributed perpendicular to each other. A No. 8 positioning pin 22 that penetrates the lower plate body and the upper plate body of the collision bracket lower connecting plate is distributed below the mounting platform 4, and a No. 4 clamping block 23 that presses the plate body on the collision bracket lower connecting plate is distributed above the mounting platform 4. The No. 4 clamping block 23 is connected to a No. 4 flip cylinder 24 installed on the mounting platform 4, and the No. 4 flip cylinder 24 is also provided with a No. 5 clamping block 25 that is distributed in parallel with the No. 4 clamping block 23 to press the matching area of ​​the No. 8 positioning pin 22. The mounting platform 4 is also provided with a No. 5 clamping block 25 that is distributed in parallel with the No. 4 clamping block 23 to press the matching area of ​​the No. 8 positioning pin 22. A No. 5 flip cylinder 26 is provided, and the No. 5 flip cylinder 26 is connected to a No. 2 positioning pin 27 for positioning the sheet on the lower connecting plate of the collision bracket; each group of No. 3 support blocks 21 is distributed in an L shape to support the left and right ends of the lower sheet of the lower connecting plate of the collision bracket; the No. 8 positioning pin 22 passes through the lower sheet and the upper sheet of the lower connecting plate of the collision bracket, and can perform preliminary positioning on the lower sheet and the upper sheet of the lower connecting plate of the collision bracket, and the sheet on the lower connecting plate of the collision bracket is secondarily positioned by the No. 2 positioning pin 27 to ensure that the position is fixed, and the lower sheet of the lower connecting plate of the collision bracket is secondarily positioned by the No. 3 positioning pin 29 to ensure that the position is fixed, and the lower sheet and the upper sheet of the lower connecting plate of the collision bracket are pressed by the No. 5 clamping block 25; Figure 5 to Figure 6 As shown, the three end points of the upper plate of the lower connecting plate of the collision bracket are clamped by the No. 4 clamping block 23 and the No. 5 clamping block 25; the mounting platform 4 is provided with a No. 6 support block 17 distributed at the No. 8 positioning pin 22 to support the lower plate of the lower connecting plate of the collision bracket, and the No. 8 positioning pin 22 passes through the No. 6 support block 17 to avoid interference during the lifting and lowering of the No. 8 positioning pin 22.

[0039] The No. 8 positioning pin 22 is connected to the No. 1 cylinder 28 installed on the mounting platform 4, and the No. 1 cylinder 28 is also provided with a No. 3 positioning pin 29 for positioning the lower plate of the lower connecting plate of the collision bracket;

[0040] The No. 5 pressing block 25 is provided with an annular portion 251 for avoiding the No. 8 positioning pin 22 . The annular portion 251 is used for avoiding the No. 8 positioning pin 22 and ensuring that the area around the No. 8 positioning pin 22 is pressed.

[0041] The control arm mounting assembly fixing component 3 includes a No. 4 support block 31 fixed on the mounting platform 4, a No. 4 positioning pin 32 is arranged below the mounting platform 4 and is distributed in parallel along the width direction of the mounting platform 4 to cooperate with the lower plate of the control arm mounting assembly, and a No. 6 clamping block 33 is distributed above the mounting platform 4 and corresponds to the No. 4 positioning pin 32 to cooperate with the upper plate of the control arm mounting assembly, and the No. 6 clamping block 33 is connected to a No. 2 cylinder 35 that drives the No. 6 clamping block 33 to move in the vertical direction and clamp the upper plate of the control arm mounting assembly, and a No. 5 positioning pin 34 is arranged inside the No. 6 clamping block 33 to cooperate with the upper plate of the control arm mounting assembly;

[0042] The No. 4 locating pin 32 near the side line of the mounting platform 4 is matched with a No. 9 clamping block 15, and the No. 9 clamping block 15 is connected to the No. 5 cylinder 13 fixed on the mounting platform 4. The No. 9 clamping block 15 is hingedly mounted on the No. 5 cylinder 13, and the No. 9 clamping block 15 is driven by the No. 5 cylinder 13 to rotate and clamp the lower plate of the control arm mounting assembly. The No. 9 clamping block 15 is provided with an avoidance hole for avoiding the No. 4 locating pin 32.

[0043] The No. 2 cylinder 35 is also connected to the No. 8 clamping blocks 37 which are arranged parallel to the width direction of the mounting platform 4 and press the upper plate of the control arm mounting assembly. Any one of the No. 8 clamping blocks 37 is provided with a No. 7 positioning pin 38 which cooperates with the upper plate of the control arm mounting assembly for positioning. Fig.10 As shown, the No. 7 positioning pin 38 is connected to the No. 2 adapter frame 16, and the corresponding No. 8 pressing block 37 and the No. 7 positioning pin 38 are connected to the No. 2 cylinder 35 through the No. 2 adapter frame 16;

[0044] The second cylinder 35 is connected to a moving unit 36 ​​that drives the second cylinder 35 to move along the length direction of the mounting platform 4 .

[0045] The mobile unit 36 ​​is slidably mounted on a slide 361 on the mounting platform 4, and a bracket 362 connected to the No. 2 cylinder 35 is provided on the slide 361. The slide 361 cooperates with a No. 3 cylinder 363 fixed on the mounting platform 4, and a support column 364 is provided on the slide 361, which extends between the upper and lower plates of the control arm mounting assembly to ensure the mounting position of the control arm mounting assembly; Figures 8 to 9 As shown, the support column 364 is distributed between the upper plate and the lower plate of the control arm mounting assembly to prevent the upper plate and the lower plate of the control arm mounting assembly from being misaligned, resulting in the installation position of the control arm cannot be met; after the upper plate and the lower plate of the control arm mounting assembly are placed, the No. 3 cylinder 363 drives the slide 361 to slide in the horizontal direction, so that the support column 364 enters between the upper plate and the lower plate of the control arm mounting assembly, and at the same time, the No. 2 cylinder 35 is in place to position the upper plate of the control arm mounting assembly.

[0046] The mounting platform 4 is provided with two groups of No. 5 support blocks 5 symmetrically arranged along the width direction of the mounting platform 4 to support the lower plate of the bending arm assembly, each group of No. 5 support blocks 5 is provided with two symmetrically arranged along the width direction of the mounting platform 4, and each No. 5 support block 5 is matched with a No. 6 positioning pin 6, and the No. 6 positioning pin 6 is connected to a No. 4 cylinder 7 fixed on the mounting platform 4; after the lower plate of the supporting bending arm assembly is placed on the No. 5 support block 5, the No. 4 cylinder 7 drives the No. 6 positioning pin 6 to rise and cooperate with the positioning hole of the lower plate of the supporting bending arm assembly for positioning;

[0047] The mounting platform 4 is also provided with a No. 6 flip cylinder 8 which is symmetrically arranged along the width direction of the mounting platform 4, and the No. 6 flip cylinder 8 is provided with a No. 7 clamping block 9 which is arranged parallel to the width direction of the mounting platform 4 and whose height gradually increases to clamp the upper sheet of the bending arm assembly; the ends of the No. 7 clamping blocks 9 are connected with positioning columns 14 which cooperate with the positioning holes of the upper sheet of the bending arm assembly; the No. 6 flip cylinder 8 drives the No. 7 clamping block 9 to clamp the upper sheet of the bending arm assembly.

[0048] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A welding fixture for the rear lower plate of an automobile subframe, characterized in that: include: A sub-frame rear lower plate fixing assembly (1) is used to position the sub-frame rear lower plate in the circumferential direction and fix the sub-frame rear lower plate; The collision bracket lower connecting plate assembly fixing components (2) are symmetrically arranged in two in the horizontal direction and are used to fix the upper and lower ends of the collision bracket lower connecting plate assembly; The control arm mounting assembly fixing components (3) are symmetrically arranged in two in the horizontal direction and press the upper plate body and the lower plate body of the control arm mounting assembly tightly so that the upper plate body and the lower plate body of the control arm mounting assembly fit together and are fixed in position; The mounting platform (4) supports the rear lower plate of the auxiliary frame, the rear lower plate fixing component of the auxiliary frame (1), the lower connecting plate assembly fixing component of the collision bracket (2), and the control arm mounting assembly fixing component (3).

2. The welding fixture for the rear lower plate of an automobile subframe according to claim 1 is characterized in that: The sub-frame rear lower plate fixing assembly (1) comprises a first limiting device (11) for positioning and pressing the front and rear ends of the sub-frame rear lower plate, and also comprises a second limiting device (12) for positioning and pressing the two sides of the sub-frame rear lower plate.

3. The welding fixture for the rear lower plate of an automobile subframe according to claim 2 is characterized in that: The No. 1 limiting device (11) comprises two groups of No. 1 supporting blocks (111) arranged on the mounting platform (4) and symmetrically distributed along the width direction of the mounting platform (4) so ​​as to fit with the lower surface of the rear lower plate of the sub-frame to support the front and rear ends of the rear lower plate of the sub-frame, and the No. 1 supporting blocks (111) are each matched with a No. 1 pressing block (112) for pressing the upper surface of the rear lower plate of the sub-frame, and the No. 1 pressing block (112) is each matched with a No. 1 turning cylinder (113) fixed on the mounting platform (4).

4. The welding fixture for the rear lower plate of an automobile subframe according to claim 3 is characterized in that: A group of the No. 1 support blocks (111) includes two symmetrically arranged along the length direction of the mounting platform (4), and another group of two symmetrically arranged along the width direction of the mounting platform (4). A No. 1 positioning pin (114) is provided on the mounting platform (4) near the side of the No. 1 support block (111) arranged parallel to the width direction of the mounting platform (4). The No. 2 support blocks (115) are symmetrically arranged along the length direction of the mounting platform (4) to support both sides of the rear lower plate of the sub-frame. The No. 2 support blocks (115) are each matched with a No. 2 clamping block (116). One of the No. 2 clamping blocks (116) is connected to a No. 2 turning cylinder (117), and the other is connected to a No. 1 turning cylinder (113) near the side of the No. 1 positioning pin (114).

5. The welding fixture for the rear lower plate of an automobile subframe according to claim 2, characterized in that: The second limiting device (12) comprises a first supporting column (121) for supporting both sides of the rear lower plate of the auxiliary frame, and also comprises a third pressing block (122) for cooperating with the first supporting column (121) to press the rear lower plate of the auxiliary frame, and the third pressing block (122) is matched with a third turning cylinder (123) fixed on the mounting platform (4).

6. The welding fixture for the rear lower plate of an automobile subframe according to claim 1, characterized in that: The collision bracket lower connecting plate assembly fixing component (2) comprises two groups of No. 3 support blocks (21) symmetrically arranged along the width direction of the mounting platform (4) to support the lower plate body of the collision bracket lower connecting plate, each group of No. 3 support blocks (21) are arranged perpendicular to each other, and No. 8 positioning pins (22) penetrating the lower plate body and the upper plate body of the collision bracket lower connecting plate are arranged below the mounting platform (4), and No. 4 pressing blocks (23) for pressing the upper plate body of the collision bracket lower connecting plate are arranged above the mounting platform (4). The No. 4 pressing block (23) is connected to a No. 4 flip cylinder (24) installed on the mounting platform (4); the No. 4 flip cylinder (24) is also provided with a No. 5 pressing block (25) which is distributed in parallel with the No. 4 pressing block (23) to press the matching area of ​​the No. 8 positioning pin (22); the mounting platform (4) is also provided with a No. 5 flip cylinder (26); the No. 5 flip cylinder (26) is connected to a No. 2 positioning pin (27) for positioning the sheet body on the lower connecting plate of the collision bracket.

7. The welding fixture for the rear lower plate of an automobile subframe according to claim 6, characterized in that: The No. 8 positioning pin (22) is connected to a No. 1 cylinder (28) mounted on the mounting platform (4), and the No. 1 cylinder (28) is also provided with a No. 3 positioning pin (29) for positioning the lower plate of the lower connecting plate of the collision bracket; The No. 5 pressing block (25) is provided with an annular portion (251) for avoiding the No. 8 positioning pin (22).

8. The welding fixture for the rear lower plate of an automobile subframe according to claim 1, characterized in that: The control arm mounting assembly fixing component (3) comprises a No. 4 support block (31) fixed on the mounting platform (4); a No. 4 positioning pin (32) is arranged below the mounting platform (4) and is distributed in parallel along the width direction of the mounting platform (4) to cooperate with the lower plate of the control arm mounting assembly; a No. 6 clamping block (33) is arranged above the mounting platform (4) and corresponds to the No. 4 positioning pin (32) to cooperate with the upper plate of the control arm mounting assembly; the No. 6 clamping block (33) is connected to a No. 2 cylinder (35) for driving the No. 6 clamping block (33) to move in the vertical direction and clamp the upper plate of the control arm mounting assembly; a No. 5 positioning pin (34) is arranged inside the No. 6 clamping block (33) to cooperate with the upper plate of the control arm mounting assembly; The No. 2 air cylinder (35) is also connected to an No. 8 pressing block (37) which presses the upper plate of the control arm mounting assembly and is distributed in parallel along the width direction of the mounting platform (4); any one of the No. 8 pressing blocks (37) is provided with a No. 7 positioning pin (38) which cooperates with the upper plate of the control arm mounting assembly for positioning; The second cylinder (35) is connected to a moving unit (36) that drives the second cylinder (35) to move along the length direction of the mounting platform (4).

9. The welding fixture for the rear lower plate of an automobile subframe according to claim 8, characterized in that: The moving unit (36) comprises a slide table (361) slidably mounted on the mounting platform (4); a bracket (362) connected to the No. 2 cylinder (35) is provided on the slide table (361); the slide table (361) cooperates with the No. 3 cylinder (363) fixed on the mounting platform (4); and a support column (364) is provided on the slide table (361) and extends between the upper plate body and the lower plate body of the control arm mounting assembly to ensure the mounting position of the control arm mounting assembly.

10. The automobile subframe rear lower plate welding fixture according to claim 1, characterized in that: The mounting platform (4) is provided with two groups of No. 5 support blocks (5) symmetrically arranged along the width direction of the mounting platform (4) to support the lower plate of the bending arm assembly, each group of No. 5 support blocks (5) is provided with two symmetrically arranged along the width direction of the mounting platform (4), and each No. 5 support block (5) is matched with a No. 6 positioning pin (6), and the No. 6 positioning pin (6) is connected to a No. 4 cylinder (7) fixed on the mounting platform (4); The mounting platform (4) is also provided with a No. 6 turning cylinder (8) symmetrically arranged along the width direction of the mounting platform (4), and the No. 6 turning cylinder (8) is provided with a No. 7 pressing block (9) arranged in parallel along the width direction of the mounting platform (4) and gradually increasing in height to press the upper plate body of the bending arm assembly.

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