Welding fixture for automobile rear-row quartered backrest assembly

Abstract

The utility model discloses a welding fixture for an automobile rear-row quartered backrest assembly. The welding fixture comprises a bottom plate; the two side supporting units are oppositely arranged on the bottom plate at intervals; the upper frame unit is arranged on the bottom plate and is used for limiting the upper frame assembly; the reinforcing unit is arranged on the bottom plate and located between the two side supporting units; the lower frame unit is arranged on the bottom plate and located between the two side supporting units; the connecting unit is arranged on the bottom plate, located between the two side supporting units and located between the reinforcing unit and the lower frame unit; the pipe fitting unit is arranged on the bottom plate, located on the outer side of the upper frame assembly and right opposite to the upper portion of the upper frame assembly. The external unit is arranged on the bottom plate and located on one side of the top of the upper frame assembly. According to the automatic welding device, the number of stages of overall welding can be reduced, all welded small components are welded into an assembly at a time, production efficiency is improved, and meanwhile feasibility and welding quality of automatic welding are guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of welding fixtures, in particular to a welding fixture for a rear-seat four-part backrest assembly of an automobile. Background Art

[0002] The rear seats of a car are usually three-seaters, and some of them adopt a 4:6 folding structure. Therefore, the structure of the backrest that is folded four-parts is different from the conventional fully fixed backrest assembly. The welding of the four-part folding backrest assembly requires welding five welded small components and two pipe fittings into an assembly. Figure 1 As shown. Currently, the welding of the support components on the left and right sides of the assembly and the upper frame components cannot be performed at the same time, otherwise the support components on the left and right sides and the reinforcement components, lower frame components and connecting components inside the upper frame components cannot be effectively positioned and welded. Because both ends of the reinforcement components, lower frame components and connecting components are welded to the inner side surfaces of the support components on the left and right sides, and the reinforcement components are also welded to the end surface of the upper frame components, conventional fixtures cannot accurately position and fix all components to ensure that the gap during welding meets the welding requirements. Utility Model Content

[0003] In view of the above-mentioned defects of the prior art, the purpose of the utility model is to provide a welding fixture for a four-part rear seat backrest assembly of an automobile, which can reduce the number of overall welding levels, weld each welded small component into an assembly at one time, improve production efficiency, and at the same time ensure the feasibility and welding quality of automated welding.

[0004] The purpose of the utility model is achieved through such technical solution:

[0005] A welding fixture for a rear quarter-backrest assembly of an automobile, comprising:

[0006] Base plate;

[0007] Two side support units are arranged on the bottom plate at a relative interval to limit the side support assembly;

[0008] An upper frame unit is arranged on the bottom plate to limit the position of the upper frame assembly;

[0009] A reinforcement unit is arranged on the bottom plate and located between the two side support units to limit the position of the reinforcement component;

[0010] A lower frame unit is arranged on the bottom plate and located between the two side support units to limit the position of the lower frame assembly;

[0011] A connection unit is arranged on the bottom plate, between the two side support units, between the reinforcement unit and the lower frame unit, and limits the connection assembly;

[0012] The pipe unit is arranged on the bottom plate, located outside the upper frame assembly and facing the upper part of the upper frame assembly;

[0013] The external unit is arranged on the bottom plate and located on one side of the top of the upper frame assembly to limit the external assembly;

[0014] The side support unit comprises:

[0015] A translation mechanism is arranged on the bottom plate;

[0016] The side clamping mechanism is arranged on the telescopic end of the translation mechanism, and clamps and fixes the inner and outer side surfaces of the middle part of the side support assembly;

[0017] The side positioning mechanism is arranged on the telescopic end of the translation mechanism to position and fix the inner and outer sides of the head of the side support assembly;

[0018] The side squeezing mechanism has a fixed part arranged on the bottom plate and a movable part arranged on the telescopic end of the translation mechanism. With the movement of the translation mechanism, the movable part approaches the fixed part to squeeze and fix the tail of the side support assembly.

[0019] Furthermore, the translation mechanism comprises:

[0020] Two slide rails are arranged in parallel and side by side, facing the support unit on the other side;

[0021] A slide plate is slidably connected with the two slide blocks; the movable parts of the side clamping mechanism, the side positioning mechanism and the side squeezing mechanism are located on the slide plate;

[0022] The stop block is arranged on the bottom plate, facing the side of the slide plate, and limits the displacement of the slide plate to the supporting unit on the other side;

[0023] The driving cylinder is fixedly connected to the bottom plate, and the telescopic end is connected to the slide plate;

[0024] The push pliers have one end fixedly connected to the bottom plate and the other end fixedly connected to the slide plate.

[0025] Furthermore, the side clamping mechanism comprises:

[0026] The side clamping seat is fixedly connected to the slide plate, has a U-shaped longitudinal section, and has an opening facing the support unit on the other side;

[0027] The side clamp quick cylinder clamp is fixedly connected to the slide plate, and the clamp arm is pressed toward the opening of the side clamp seat;

[0028] The side positioning mechanism includes:

[0029] A side support arm, fixedly connected to the slide plate;

[0030] The positioning block is fixedly connected to the side support arm, and the inner side surface is provided with a convex side positioning rod;

[0031] The side branch quick cylinder clamp is connected to the side branch arm, and the clamping arm is pressed toward the inner side of the positioning block;

[0032] The side squeezing mechanism comprises:

[0033] A side fixed column, arranged on the bottom plate;

[0034] The side movable part is arranged on the slide plate, has a U-shaped longitudinal section, and its opening faces the other side support unit; and a receiving groove is also arranged at the groove bottom of the side movable part.

[0035] Furthermore, the upper frame unit comprises:

[0036] A plurality of upper frame accommodating columns are arranged on the bottom plate, and grooves for accommodating the position-limiting upper frame components are provided at the upper ends;

[0037] At least two upper frame quick cylinder clamps are arranged on the bottom plate to press and fix the upper frame assembly downward.

[0038] Furthermore, the reinforcement unit comprises:

[0039] At least two reinforcement accommodating columns are arranged on the bottom plate, and the upper ends thereof are provided with grooves for accommodating the limit reinforcement components;

[0040] At least two reinforced quick cylinder clamps are arranged on the bottom plate to press and fix the reinforced assembly downward.

[0041] The reinforced positioning column is arranged between a plurality of reinforced accommodating columns, and a reinforced positioning rod is arranged at the upper end.

[0042] Furthermore, the lower frame unit comprises:

[0043] At least two lower frame accommodating columns are arranged on the bottom plate, and the upper ends thereof are provided with grooves for accommodating the lower frame reinforcement components;

[0044] At least two lower frame quick cylinder clamps are arranged on the bottom plate to press and fix the lower frame assembly downward.

[0045] The lower frame positioning piece has a groove on the top and side limit blocks on both sides.

[0046] Furthermore, the connection unit comprises:

[0047] At least two connection accommodating columns are arranged on the bottom plate, and the upper ends thereof are provided with grooves for accommodating the limit connection components;

[0048] At least two connecting quick cylinder clamps are arranged on the bottom plate to press the connecting assembly downward and fix it.

[0049] The connection positioning column is arranged between a plurality of connection accommodating columns, and a connection positioning rod is arranged at the upper end.

[0050] Furthermore, the pipe unit comprises:

[0051] The oblique movement mechanism is obliquely arranged on the bottom plate and points to the top of the upper frame assembly;

[0052] Two top sleeves are arranged on the moving end of the tilting mechanism;

[0053] The stop post is arranged on the bottom plate and is directly opposite to the end of the top sleeve.

[0054] Furthermore, it also includes a plurality of ejection cylinders, which are vertically arranged on the bottom plate, and the upper ends of which are directly opposite to the backrest assembly after welding.

[0055] Furthermore, the external component includes:

[0056] At least two external accommodating columns are arranged on the bottom plate, and the upper ends thereof are provided with grooves for accommodating the position-limiting external connection components;

[0057] At least two external quick cylinder clamps are arranged on the bottom plate to buckle and fix the external components downward; an external positioning rod is arranged on the buckling end face of at least one external quick cylinder clamp.

[0058] Due to the adoption of the above technical solution, the utility model has the following advantages:

[0059] 1. All the parts to be welded are limited and fixed at one time through the independently set side support unit, upper frame unit, reinforcement unit, lower frame unit, connection unit and pipe fitting unit, which is convenient for one-time welding of the equipment and ensures the welding quality.

[0060] 2. The side support unit clamps and fixes the side support assembly, and then combines and fixes it with the upper frame assembly through a translation mechanism, so as to meet the purpose of welding the side support assembly and the upper frame assembly after being fitted, without the need for multiple stages of welding.

[0061] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and study, or may be taught from the practice of the present invention to some extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The accompanying drawings of the present utility model are as follows:

[0063] Figure 1 This is a schematic diagram of the structure of the rear 4-part backrest assembly of the car after welding.

[0064] Figure 2 Schematic diagram of the top view of the welding fixture for the rear quarter-backrest assembly of an automobile in the embodiment.

[0065] Figure 3 for Figure 2 Enlarged structural diagram at A in the middle.

[0066] Figure 4Schematic diagram of the front view of the welding fixture for the rear quarter-backrest assembly of an automobile in the embodiment.

[0067] Figure 5 It is a three-dimensional structural schematic diagram of the welding fixture of the rear quarter-backrest assembly of the automobile in the embodiment.

[0068] Figure 6 for Figure 5 Enlarged structural diagram at B in the middle.

[0069] Figure 7 for Figure 5 Enlarged structural diagram at point C in the middle.

[0070] Figure 8 for Figure 5 Enlarged structural diagram at point D in the middle.

[0071] Fig. 9 for Figure 5 Enlarged structural diagram at E (reinforced unit) in the middle.

[0072] Fig.10 for Figure 5 Enlarged structural diagram at F (connection unit).

[0073] Fig.11 for Figure 5 Enlarged structural diagram at G in the middle.

[0074] Fig.12 for Figure 5 Enlarged structural diagram at H in the middle.

[0075] Fig.13 for Figure 5 Enlarged structural diagram at J in the middle.

[0076] Fig.14 It is a front view structural schematic diagram of the welding fixture after placing the rear four-part backrest assembly of the automobile in the embodiment.

[0077] Fig.15 It is a schematic diagram of the three-dimensional structure of the welding fixture after placing the rear four-part backrest assembly of the automobile in the embodiment.

[0078] In the figure: 1. bottom plate; 211. slide rail; 212. slide plate; 213. stop block; 214. drive cylinder; 215. push clamp; 221. side clamp seat; 222. side clamp quick cylinder clamp; 231. side support arm; 232. positioning block; 233. side positioning rod; 234. side support quick cylinder clamp; 241. side fixed column; 242. side movable part; 2421. receiving groove; 31. upper frame receiving column; 32. upper frame quick cylinder clamp Clamp; 41. Strengthening accommodating column; 42. Strengthening quick cylinder clamp; 43. Strengthening positioning column; 51. Lower frame accommodating column; 52. Lower frame quick cylinder clamp; 53. Lower frame positioning block 232; 54. Side limit block; 61. Connecting accommodating column; 62. Connecting quick cylinder clamp; 63. Connecting positioning column; 71. Oblique shift mechanism; 72. Ejector sleeve; 73. Stop column; 81. External accommodating column; 82. External quick cylinder clamp; 9. Ejecting cylinder;

[0079] 100. Side support assembly; 200. Upper frame assembly; 300. Reinforcement assembly; 400. Lower frame assembly; 500. Connection assembly; 600. Pipe fitting assembly; 700. External assembly. DETAILED DESCRIPTION

[0080] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0081] Example:

[0082] like Figure 1-13 As shown, a welding fixture for a rear quarter-backrest assembly of an automobile comprises:

[0083] Bottom plate 1;

[0084] Two side support units are arranged on the bottom plate 1 at a relative interval to limit the side support assembly 100;

[0085] The upper frame unit is arranged on the bottom plate 1 and limits the upper frame assembly 200;

[0086] The reinforcing unit is arranged on the bottom plate 1 and is located between the two side supporting units to limit the reinforcing assembly 300;

[0087] The lower frame unit is arranged on the bottom plate 1 and is located between the two side support units to limit the lower frame assembly 400;

[0088] The connection unit is arranged on the bottom plate 1, between the two side support units, between the reinforcement unit and the lower frame unit, and limits the connection assembly 500;

[0089] The pipe unit is arranged on the bottom plate 1, located outside the upper frame assembly 200, and facing the upper part of the upper frame assembly 200;

[0090] The external unit is arranged on the bottom plate 1 and is located on one side of the top of the upper frame assembly 200 to limit the external assembly 700;

[0091] The side support unit comprises:

[0092] A translation mechanism is arranged on the bottom plate 1;

[0093] The side clamping mechanism is provided on the telescopic end of the translation mechanism, and clamps and fixes the inner and outer side surfaces of the middle part of the side support assembly 100;

[0094] The side positioning mechanism is provided on the telescopic end of the translation mechanism to position and fix the inner and outer sides of the head of the side support assembly 100;

[0095] The side squeezing mechanism has a fixed part arranged on the bottom plate 1 and a movable part arranged on the telescopic end of the translation mechanism. With the movement of the translation mechanism, the movable part approaches the fixed part to squeeze and fix the rear end of the side support assembly 100.

[0096] The independently arranged side support unit, upper frame unit, reinforcement unit, lower frame unit, connection unit, and pipe unit are used to limit and fix all the parts to be welded at one time, so that the equipment can perform one-time welding and ensure the welding quality. The side support unit clamps and fixes the side support assembly 100, and then combines and fixes it with the upper frame assembly 200 through the translation mechanism, so as to meet the purpose of welding after the side support assembly 100 and the upper frame assembly 200 are engaged, without the need for multiple stages of welding.

[0097] In this embodiment, the translation mechanism includes:

[0098] Two slide rails 211 are arranged in parallel and face the support unit on the other side;

[0099] The slide plate 212 is slidably connected to the two sliders; the movable parts of the side clamping mechanism, the side positioning mechanism and the side squeezing mechanism are located on the slide plate 212;

[0100] The stop block 213 is provided on the bottom plate 1, facing the side of the slide plate 212, and limits the displacement of the slide plate 212 toward the supporting unit on the other side;

[0101] The driving cylinder 214 is fixedly connected to the bottom plate 1, and the telescopic end is connected to the slide plate 212;

[0102] The push clamp 215 has one end fixedly connected to the base plate 1 and the other end fixedly connected to the slide plate 212 .

[0103] When the driving cylinder 214 fails to work, or when the position of the stop block 213 is adjusted, the slide plate 212 is moved by the push clamp 215.

[0104] In this embodiment, the side clamping mechanism includes:

[0105] The side clamping seat 221 is fixedly connected to the slide plate 212, and has a U-shaped longitudinal section, with an opening facing the other side support unit;

[0106] The side clamp quick cylinder clamp 222 is fixedly connected to the slide plate 212, and the clamp arm clamps and presses the opening pointing to the side clamp seat 221;

[0107] The side positioning mechanism includes:

[0108] The side arm 231 is fixedly connected to the slide plate 212;

[0109] The positioning block 232 is fixedly connected to the side support arm 231, and the inner side surface is provided with a protruding side positioning rod 233;

[0110] The side branch quick cylinder clamp 234 is connected to the side branch arm 231, and the clamp arm clamps and presses the inner side of the positioning block 232;

[0111] The side squeezing mechanism comprises:

[0112] Side fixing column 241, provided on the bottom plate 1;

[0113] The side movable portion 242 is disposed on the slide plate 212 , and has a U-shaped longitudinal section, with an opening facing the other side support unit; a receiving groove 2421 is further disposed at the bottom of the groove of the side movable portion 242 .

[0114] The side support assembly 100 is clamped by the cylinder clamp, and positioned by the side positioning rod 233. The side support assembly 100 and the upper frame assembly 200 are squeezed and limited into one by the cooperation of the side fixing column 241 and the side movable part 242.

[0115] In this embodiment, the upper frame unit includes:

[0116] A plurality of upper frame accommodating columns 31 are arranged on the bottom plate 1, and a groove for accommodating the upper frame assembly 200 is provided at the upper end;

[0117] At least two upper frame quick cylinder clamps 32 are arranged on the bottom plate 1 to press and fix the upper frame assembly 200 downward.

[0118] The reinforcement unit comprises:

[0119] At least two reinforcement accommodating columns 41 are arranged on the bottom plate 1, and the upper ends thereof are provided with grooves for accommodating the limiting reinforcement assembly 300;

[0120] At least two reinforced quick cylinder clamps 42 are arranged on the base plate 1 to press and fix the reinforcement component 300 downward.

[0121] The reinforcement positioning column 43 is disposed between the plurality of reinforcement accommodating columns 41 and has a reinforcement positioning rod at its upper end.

[0122] The lower frame unit comprises:

[0123] At least two lower frame accommodating columns 51 are arranged on the bottom plate 1, and the upper ends thereof are provided with grooves for accommodating the lower frame reinforcement assembly 300;

[0124] At least two lower frame quick cylinder clamps 52 are arranged on the bottom plate 1 to press and fix the lower frame assembly 400 downward.

[0125] The lower frame positioning piece has a groove on the top and side limit blocks 54 on both sides.

[0126] The connecting unit comprises:

[0127] At least two connection accommodating columns 61 are arranged on the bottom plate 1, and the upper ends thereof are provided with grooves for accommodating the limit connection assembly 500;

[0128] At least two connecting quick cylinder clamps 62 are arranged on the base plate 1 to press the connecting assembly 500 downward and fix it.

[0129] The connection positioning column 63 is disposed between the plurality of connection accommodating columns 61 and has a connection positioning rod at its upper end.

[0130] The upper frame assembly 200, the lower frame assembly 400 and the connecting assembly 500 are all fixed by means of slotted accommodation columns and cylinder clamps, and the assemblies are positioned by means of positioning rods and limiting structures matching the appearance of the assemblies.

[0131] In this embodiment, the pipe unit includes:

[0132] The tilting mechanism 71 is tiltedly arranged on the bottom plate 1 and points to the top of the upper frame assembly 200;

[0133] Two top sleeves 72 are arranged on the moving end of the tilting mechanism 71;

[0134] The stop post 73 is disposed on the bottom plate 1 and is directly opposite to the end of the top sleeve 72 .

[0135] The pipe assembly 600 to be welded is covered with the top sleeve 72 to achieve the limitation and positioning of the pipe.

[0136] In this embodiment, a plurality of ejection cylinders 9 are further included, which are vertically arranged on the bottom plate 1, with the upper ends thereof facing the backrest assembly after welding.

[0137] After welding is completed, the assembly is separated from the device by ejecting the cylinder 9, which is convenient for taking out.

[0138] In this embodiment, the external component 700 includes:

[0139] At least two external accommodating columns 81 are arranged on the bottom plate 1, and the upper ends thereof are provided with grooves for accommodating the position-limiting external connection components 700;

[0140] At least two external quick cylinder clamps 82 are arranged on the bottom plate 1 to buckle and fix the external assembly 700 downward; an external positioning rod is provided on the buckling end face of at least one external quick cylinder clamp.

[0141] The external assembly 700 is used to install the slide groove of the restraining seat belt, so it is in the upper left corner of the assembly. It is fixed by the accommodating column and the cylinder clamp, and positioned by the positioning rod. It can also be limited and positioned by matching the outer contour of the external assembly with multiple external accommodating columns 81.

[0142] The welding fixture of the rear quarter-backrest assembly of the automobile in this embodiment is used as follows: first, the two driving cylinders 214 are controlled to work so that the two slide plates 212 are relatively far apart. The two side support assemblies 100 are respectively placed in the two side support units, and then the side clamp quick cylinder clamp and the side branch quick cylinder clamp 234 are controlled to clamp the side support units.

[0143] Then, the upper frame assembly 200 , the reinforcement assembly 300 , the lower frame assembly 400 , the connection assembly 500 , and the external assembly 700 are arranged in sequence; and the pipe assembly 600 is put onto the top sleeve 72 .

[0144] Control all cylinder clamps to clamp and fix the corresponding components, and then control the two driving cylinders 214 to work, so that the two slides 212 are relatively close until the slides 212 are against the stop blocks 213. At this time, the side support assembly 100 is buckled outside the upper frame assembly 200; control the oblique shift mechanism 71 to extend the top sleeve 72 downward, so that the pipe assembly 600 is in contact with the upper frame assembly 200.

[0145] This completes the fixing of all components that need to be welded, such as Figure 14-15 As shown. At this time, a mechanical arm is used for welding. After welding is completed, the above operation is reversed to release the clamping and fixing of the assembly. Then the ejection cylinder 9 is controlled to extend to eject the assembly and take it out.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A welding fixture for a rear quarter-backrest assembly of an automobile, characterized in that: include: Base plate; Two side support units are arranged on the bottom plate at a relative interval to limit the side support assembly; An upper frame unit is arranged on the bottom plate to limit the position of the upper frame assembly; A reinforcement unit is arranged on the bottom plate and located between the two side support units to limit the position of the reinforcement component; A lower frame unit is arranged on the bottom plate and located between the two side support units to limit the position of the lower frame assembly; A connection unit is arranged on the bottom plate, between the two side support units, between the reinforcement unit and the lower frame unit, and limits the connection assembly; The pipe unit is arranged on the bottom plate, located outside the upper frame assembly and facing the upper part of the upper frame assembly; The external unit is arranged on the bottom plate and located on one side of the top of the upper frame assembly to limit the external assembly; The side support unit comprises: A translation mechanism is arranged on the bottom plate; The side clamping mechanism is arranged on the telescopic end of the translation mechanism, and clamps and fixes the inner and outer side surfaces of the middle part of the side support assembly; The side positioning mechanism is arranged on the telescopic end of the translation mechanism to position and fix the inner and outer sides of the head of the side support assembly; The side squeezing mechanism has a fixed part arranged on the bottom plate and a movable part arranged on the telescopic end of the translation mechanism. With the movement of the translation mechanism, the movable part approaches the fixed part to squeeze and fix the tail of the side support assembly.

2. The welding fixture for the rear quarter backrest assembly of an automobile according to claim 1 is characterized in that: The translation mechanism comprises: Two slide rails are arranged in parallel and side by side, facing the support unit on the other side; A slide plate is slidably connected with the two slide blocks; the movable parts of the side clamping mechanism, the side positioning mechanism and the side squeezing mechanism are located on the slide plate; The stop block is arranged on the bottom plate, facing the side of the slide plate, and limits the displacement of the slide plate to the supporting unit on the other side; The driving cylinder is fixedly connected to the bottom plate, and the telescopic end is connected to the slide plate; The push pliers have one end fixedly connected to the bottom plate and the other end fixedly connected to the slide plate.

3. The welding fixture for the rear quarter backrest assembly of an automobile according to claim 1, characterized in that: The side clamping mechanism comprises: The side clamping seat is fixedly connected to the slide plate, has a U-shaped longitudinal section, and has an opening facing the support unit on the other side; The side clamp quick cylinder clamp is fixedly connected to the slide plate, and the clamp arm is pressed toward the opening of the side clamp seat; The side positioning mechanism includes: A side support arm, fixedly connected to the slide plate; The positioning block is fixedly connected to the side support arm, and the inner side surface is provided with a convex side positioning rod; The side branch quick cylinder clamp is connected to the side branch arm, and the clamping arm is pressed toward the inner side of the positioning block; The side squeezing mechanism comprises: A side fixed column, arranged on the bottom plate; The side movable part is arranged on the slide plate, has a U-shaped longitudinal section, and its opening faces the other side support unit; and a receiving groove is also arranged at the groove bottom of the side movable part.

4. The welding fixture for the rear quarter backrest assembly of an automobile according to claim 1, characterized in that: The upper frame unit comprises: A plurality of upper frame accommodating columns are arranged on the bottom plate, and grooves for accommodating the position-limiting upper frame components are provided at the upper ends; At least two upper frame quick cylinder clamps are arranged on the bottom plate to press and fix the upper frame assembly downward.

5. The welding fixture for the rear quarter backrest assembly of an automobile according to claim 1, characterized in that: The reinforcement unit comprises: At least two reinforcement accommodating columns are arranged on the bottom plate, and the upper ends thereof are provided with grooves for accommodating the limit reinforcement components; At least two reinforced quick cylinder clamps are arranged on the bottom plate to press and fix the reinforcement assembly downward; The reinforced positioning column is arranged between a plurality of reinforced accommodating columns, and a reinforced positioning rod is arranged at the upper end.

6. The welding fixture for the rear quarter backrest assembly of an automobile according to claim 1, characterized in that: The lower frame unit comprises: At least two lower frame accommodating columns are arranged on the bottom plate, and the upper ends thereof are provided with grooves for accommodating the lower frame reinforcement components; At least two lower frame quick cylinder clamps are arranged on the bottom plate to press and fix the lower frame assembly downward; The lower frame positioning piece has a groove on the top and side limit blocks on both sides.

7. The welding fixture for the rear quarter backrest assembly of an automobile according to claim 1, characterized in that: The connecting unit comprises: At least two connection accommodating columns are arranged on the bottom plate, and the upper ends thereof are provided with grooves for accommodating the limit connection components; At least two connecting quick cylinder clamps are arranged on the bottom plate to buckle and fix the connecting assembly downward; The connection positioning column is arranged between a plurality of connection accommodating columns, and a connection positioning rod is arranged at the upper end.

8. The welding fixture for the rear quarter backrest assembly of an automobile according to claim 1, characterized in that: The pipe fitting unit comprises: The oblique movement mechanism is obliquely arranged on the bottom plate and points to the top of the upper frame assembly; Two top sleeves are arranged on the moving end of the tilting mechanism; The stop post is arranged on the bottom plate and is directly opposite to the end of the top sleeve.

9. The welding fixture for the rear quarter backrest assembly of an automobile according to claim 1, characterized in that: It also includes a plurality of ejection cylinders which are vertically arranged on the bottom plate, and the upper ends of the cylinders are directly opposite to the backrest assembly after welding.

10. The welding fixture for the rear quarter backrest assembly of an automobile according to claim 1, characterized in that: The external components include: At least two external accommodating columns are arranged on the bottom plate, and the upper ends thereof are provided with grooves for accommodating the position-limiting external connection components; At least two external quick cylinder clamps are arranged on the bottom plate to buckle and fix the external components downward; an external positioning rod is arranged on the buckling end face of at least one external quick cylinder clamp.

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