Welding tool structure for back frame of single supine device

Abstract

The utility model provides a single supine device back frame welding tool structure which comprises a base, a positioning pressing and clamping assembly is installed on the portion, corresponding to a chair back framework, of the middle of the base, and a supine device fixing assembly used for positioning a supine device is installed on one of the left side and the right side of the front side of the base. A hinge fixing assembly used for positioning a chair back framework hinge is installed on the other side of the base, and an auxiliary fixing assembly is installed at the position, between the supine device fixing assembly and the hinge fixing assembly, of the front side of the base. The device is reasonable in design, concentric placement of an angle adjuster and a hinge is achieved through cooperation of the supine device fixing assembly, the hinge fixing assembly and the auxiliary fixing assembly, then a chair back framework is limited through the positioning pressing and clamping assembly, dislocation is avoided when the chair back framework is welded with the angle adjuster and the hinge, the welding precision is guaranteed, and the welding efficiency is improved. Specialized production is facilitated, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a welding fixture structure for a single supine recumbent back frame. Background Technology

[0002] Currently, seats are important components of automotive interiors. Modern welding production actively promotes and utilizes tooling fixtures adapted to the product structure. This not only improves product quality and reduces worker workload but also plays a crucial role in accelerating the mechanization and automation of welding production. Existing technology for single-reclining seat backrests involves an adjuster on one side of the seat backrest bottom and a hinge on the other. The adjustmenter and hinge work together to rotate the seat backrest. During welding, the adjuster and hinge are typically welded separately. Because they are not welded synchronously, misalignment between the adjuster and hinge occurs, leading to the scrapping of the seat frame. Furthermore, due to the lack of appropriate tooling for fixation, the weld joint strength between the adjuster and hinge is defective, affecting safety during use. Utility Model Content

[0003] In view of this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a welding fixture structure for a single supine chair back frame. The design is reasonable. Through the cooperation of the supine chair fixing component, the hinge fixing component and the auxiliary fixing component, the angle adjuster and the hinge are placed concentrically. Then, the positioning clamp component limits the back frame, so that there will be no misalignment when the back frame is welded to the angle adjuster and the hinge, ensuring the welding accuracy, facilitating specialized production and improving production efficiency.

[0004] This utility model is achieved using the following solution: a welding fixture structure for a single supine chair back frame: including a base, a positioning clamping assembly installed on the middle of the base corresponding to the chair back frame, a supine chair fixing assembly for positioning the supine chair on one side of the front left and right sides of the base, and a hinge fixing assembly for positioning the chair back frame hinge on the other side, and an auxiliary fixing assembly installed on the front side of the base between the supine chair fixing assembly and the hinge fixing assembly.

[0005] Furthermore, the supine device fixing assembly includes a supine device pushing cylinder, which is horizontally mounted on the base. The telescopic end of the supine device pushing cylinder faces the center of the base plate. A sliding block is connected to the telescopic end of the supine device pushing cylinder, and at least two positioning pins are provided on the sliding block corresponding to the supine device.

[0006] Furthermore, a positioning block is installed on the side of the sliding block facing the middle of the base corresponding to the positioning pin, and a horizontally arranged L-shaped connecting block is installed on the side of the positioning block. The horizontal part of the L-shaped connecting block is fixed to the side of the positioning block, and the positioning pin is installed on the end of the horizontal longitudinal part of the L-shaped connecting block.

[0007] Furthermore, the hinge fixing assembly includes a positioning and pushing cylinder, which is horizontally mounted on the base. The telescopic end of the positioning and pushing cylinder faces the center of the base plate. A fixing block is connected to the telescopic end of the positioning and pushing cylinder. A vertically arranged L-shaped plug block is installed on the fixing block. The horizontal part of the L-shaped plug block is fixedly connected to the fixing block. A pin that cooperates with the hinge is horizontally placed on the vertical part of the L-shaped plug block.

[0008] Furthermore, the auxiliary fixing component includes a support frame arranged symmetrically on the left and right sides. A horizontally arranged auxiliary installation cylinder is installed on the support frame. The telescopic end of the auxiliary installation cylinder faces the same side of the supine device fixing component or the hinge fixing component. A limiting clamping plate for abutting against the inside of the supine device is installed on the telescopic end of the auxiliary installation cylinder corresponding to the supine device fixing component. A limiting abutting structure for abutting against the inside of the hinge of the positioning chair back frame is installed on the telescopic end of the auxiliary installation cylinder corresponding to the hinge fixing component.

[0009] Furthermore, one end of the limiting clamping plate is fixed to the end of the corresponding auxiliary mounting cylinder, and a stop block A is installed on the other end. The stop block A has a positioning hole corresponding to the positioning pin. The limiting stop structure includes a stop block B, which is fixed to the end of the corresponding auxiliary mounting cylinder. A limiting strip is connected to the stop block B. The end of the limiting strip has a hole corresponding to the pin, and the edge of the end of the strip has a notch communicating with the hole.

[0010] Furthermore, the support frame includes a support base, on which a vertical support plate is mounted. The auxiliary installation cylinder is horizontally mounted on one side of the support plate. On the other side of the support plate, a limiting mechanism is mounted to limit the maximum distance of the extension of the limiting clamping plate or the limiting abutment structure. The limiting mechanism is a horizontally arranged L-shaped limiting block. The end of the horizontal part of the L-shaped limiting block is fixed to the support plate. The horizontal longitudinal part of the L-shaped limiting block is located in front of the extension direction of the limiting clamping plate or the limiting abutment structure. A rubber block is provided on the horizontal longitudinal part of the L-shaped limiting block corresponding to the limiting clamping plate or the limiting abutment structure.

[0011] Furthermore, the positioning clamping assembly includes several clamping mechanisms distributed along the frame of the chair back skeleton. Each clamping mechanism includes a limiting clamping block. The limiting clamping block is provided with a limiting clamping groove corresponding to the frame of the chair back skeleton. The limiting clamping block is installed on the base. A limiting pin is inserted into the bottom of the limiting clamping groove. A pressing mechanism is installed on the base next to the limiting clamping block.

[0012] Furthermore, the crimping mechanism also includes a vertically arranged crimping cylinder with its telescopic end facing upward. A hinge seat is provided on the cylinder sleeve of the crimping cylinder beside the telescopic end. A swing rod is rotatably connected to the hinge seat. A crimping claw is rotatably connected to the upper end of the swing rod. The middle part of the crimping claw is rotatably connected to the upper end of the swing rod. The crimping end of the crimping claw is located on the limiting pressure groove. The telescopic end of the crimping cylinder is rotatably connected to the non-crimping end of the crimping claw.

[0013] Furthermore, the crimping claw includes a crimping block, a crimping claw hinge seat is provided on one end of the crimping block, the swing rod is rotatably connected to the middle of the crimping claw hinge seat, the telescopic end of the crimping cylinder is rotatably connected to the end of the crimping claw hinge seat, and a crimping claw block is installed on the other end of the crimping block.

[0014] Compared with the prior art, the present invention has the following advantages: it is reasonably designed. By cooperating with the reclining device fixing component, the hinge fixing component and the auxiliary fixing component, the angle adjuster and the hinge are placed concentrically. Then, the positioning clamp component limits the backrest frame, so that there will be no misalignment when the backrest frame is welded with the angle adjuster and the hinge, ensuring the welding accuracy, facilitating professional production and improving production efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ;

[0016] Figure 2 This is a top view of an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 ;

[0018] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle;

[0019] Figure 5 for Figure 3 Enlarged structural diagram at point B;

[0020] Figure 6 This is a schematic diagram of the combined structure of the supine device fixing component and the auxiliary fixing component in an embodiment of this utility model;

[0021] Figure 7 This is a schematic diagram of the combined structure of the hinge fixing component and the auxiliary fixing component in an embodiment of this utility model;

[0022] Figure 8 This is a schematic diagram of the chair back frame structure of an embodiment of the present invention.

[0023] In the diagram: 1-Base; 2-Positioning clamp assembly; 3-Supine device fixing assembly; 4-Hinge fixing assembly; 5-Auxiliary fixing assembly; 6-Supine device pushing cylinder; 7-Sliding block; 8-Positioning pin; 9-Through hole; 10-Positioning block; 11-L-shaped connecting block; 12-Positioning pushing cylinder; 13-Fixing block; 14-L-shaped insertion block; 15-Pin; 16-Support frame; 17-Auxiliary installation cylinder; 18-Limit clamping plate; 19-Limit abutment structure; 20-Abutment block A; 21-Positioning hole; 22-Abutment block B; 23-Limiting strip; 24-Insertion hole ; 25-Notch; 26-Support seat; 27-Support plate; 28-Limiting mechanism; 29-L-shaped limiting block; 30-Rubber block; 31-Clamping mechanism; 32-Limiting pressure block; 33-Limiting pressure groove; 34-Crimping mechanism; 35-Crimping cylinder; 36-Hinge seat; 37-Swing rod; 38-Crimping claw; 39-Crimping block; 40-Crimping claw hinge seat; 41-Crimping claw block; 42-Rib fixing seat; 43-Rib fixing groove; 44-Rib pressing block; 45-Switch assembly; 46-Chair back frame; 47-Reclining device; 48-Chair back frame hinge; 49-Rib. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] like Figure 1-8As shown, a welding fixture structure for a single supine chair back frame includes a base 1. A positioning clamping assembly 2 is installed on the middle of the base corresponding to the chair back frame 46. A supine chair fixing assembly 3 for positioning the supine chair 47 is installed on one side of the front left and right sides of the base, and a hinge fixing assembly 4 for positioning the chair back frame hinge 48 is installed on the other side. An auxiliary fixing assembly 5 is installed on the front side of the base between the supine chair fixing assembly and the hinge fixing assembly. The design is reasonable. Through the cooperation of the supine chair fixing assembly, the hinge fixing assembly and the auxiliary fixing assembly, the concentric placement of the angle adjuster and the hinge is achieved. Then, the positioning clamping assembly limits the chair back frame and places the chair back frame in a suitable position between the angle adjuster and the hinge. This ensures that there will be no misalignment when the chair back frame is welded to the angle adjuster and the hinge, guaranteeing the welding accuracy, facilitating specialized production and improving production efficiency. It should be noted that the supine chair mentioned in this embodiment refers to the angle adjuster and the assembly structure of related connecting parts. Since this is existing technology, it will not be described in detail.

[0028] In this embodiment, to fix the outer side of the supine device, the supine device fixing assembly includes a supine device pushing cylinder 6, which is horizontally mounted on the base. The telescopic end of the supine device pushing cylinder faces the center of the base plate. A sliding block 7 is connected to the telescopic end of the supine device pushing cylinder. At least two positioning pins 8 are provided on the sliding block corresponding to the supine device, that is, at least two positioning pins are provided corresponding to the angle adjuster on the supine device. A through hole 9 is provided on the angle adjuster corresponding to the positioning pin. The supine device pushing cylinder is driven to make the sliding block slide, thereby enabling the positioning pin to effectively fix the outer side of the angle adjuster on the supine device.

[0029] In this embodiment, in order to install the positioning pin, a positioning block 10 is installed on the side of the sliding block facing the middle of the base corresponding to the positioning pin. An L-shaped connecting block 11 is installed on the side of the positioning block. The horizontal part of the L-shaped connecting block is fixed to the side of the positioning block. The positioning pin is installed on the end of the horizontal longitudinal part of the L-shaped connecting block. That is, a pin hole that mates with the positioning pin is opened on the end of the horizontal longitudinal part of the L-shaped connecting block. The positioning pin is fixed in the pin hole.

[0030] In this embodiment, in order to fix the outer side of the hinge, the hinge fixing assembly includes a positioning and pushing cylinder 12. The positioning and pushing cylinder is horizontally mounted on the base. The telescopic end of the positioning and pushing cylinder faces the middle of the base plate. A fixing block 13 is connected to the telescopic end of the positioning and pushing cylinder. A vertically arranged L-shaped plug block 14 is installed on the fixing block. The horizontal part of the L-shaped plug block is fixedly connected to the fixing block. A pin 15 that cooperates with the hinge is horizontally placed on the vertical part of the L-shaped plug block. The pin corresponds to the hinge hole on the outer side of the hinge. That is, a pin hole that cooperates with the pin is opened on the end of the vertical part of the L-shaped plug block. The pin is fixed in the pin hole.

[0031] In this embodiment, to achieve the fixation of the supine device and the inner side of the hinge, the auxiliary fixing assembly includes a support frame 16 symmetrically arranged on both sides. A horizontally arranged auxiliary installation cylinder 17 is mounted on the support frame. The telescopic end of the auxiliary installation cylinder faces the supine device fixing assembly or hinge fixing assembly on the same side. A limiting clamping plate 18 for abutting against the inner side of the supine device is installed on the telescopic end of the auxiliary installation cylinder corresponding to the supine device fixing assembly. A limiting abutting structure 19 for abutting against the inner side of the hinge of the positioning chair back frame is installed on the telescopic end of the auxiliary installation cylinder corresponding to the hinge fixing assembly. In use, the telescopic end of the auxiliary installation cylinder extends and retracts, causing the limiting clamping plate or limiting abutting structure to be pushed out, thereby abutting against the inner side of the supine device and the hinge. More specifically, one end of the limiting clamping plate is fixed to the end of the corresponding auxiliary installation cylinder, and the other end is... A stop block A20 is installed, and a positioning hole 21 is provided on the stop block A corresponding to the positioning pin. In use, when the positioning pin on the L-shaped connecting block passes through the hole, the stop block A slides to abut against the angle adjuster. At this time, the end of the positioning pin is inserted into the positioning hole to achieve clamping of the supine device. The limiting stop structure includes a stop block B22, which is fixed to the end of the corresponding auxiliary installation cylinder. A limiting strip 23 is connected to the stop block B. An insertion hole 24 is provided on the end of the limiting strip corresponding to the pin. In use, when the pin on the L-shaped connecting block passes through the hinge hole, the stop block B slides to abut against the hinge. At this time, the end of the pin is inserted into the insertion hole to achieve clamping of the hinge. A notch 25 communicating with the insertion hole is provided on the edge of the end of the strip. The notch is used for subsequent separation of the strip and the hinge. At the same time, a positioning protrusion that cooperates with the notch can also be provided on the hinge plate to facilitate positioning.

[0032] In this embodiment, for reasonable design, the specific structure of the support frame is as follows: the support frame includes a support base 26, which is fixed to the base. A vertical support plate 27 is installed on the support base. The auxiliary installation cylinder is horizontally installed on one side of the support plate. A limiting mechanism 28 is installed on the other side of the support plate to limit the maximum distance of the extension of the limiting clamping plate or the limiting abutment structure. The limiting mechanism is a horizontally arranged L-shaped limiting block 29. The end of the horizontal part of the L-shaped limiting block is fixed to the support plate. The horizontal longitudinal part of the L-shaped limiting block is located in front of the extension direction of the limiting clamping plate or the limiting abutment structure. A rubber block 30 is provided on the horizontal longitudinal part of the L-shaped limiting block corresponding to the limiting clamping plate or the limiting abutment structure. Specifically, the rubber block is located in the forward direction of the extension end of the auxiliary installation cylinder, which can effectively buffer the impact of the limiting clamping plate. A rib plate for reinforcing the overall structure is connected between the side of the support plate away from the auxiliary installation cylinder and the support base. Specifically, the end of the horizontal part of the L-shaped limiting block is fixed above the rib plate.

[0033] In this embodiment, to achieve placement and positioning of the chair back frame, the positioning clamping assembly includes several clamping mechanisms 31 distributed along the frame of the chair back frame. That is, the chair back frame is placed horizontally on the base, and the chair back frame is fixed on the base by several clamping mechanisms. The clamping mechanisms do not interfere with the reclining device fixing assembly, hinge fixing assembly, and auxiliary fixing assembly. The clamping mechanism includes a limiting pressure block 32. The limiting pressure block is provided with a limiting pressure groove 33 corresponding to the frame tube of the chair back frame. The limiting pressure groove passes through the limiting pressure block along the length direction of the frame tube of the chair back frame. The limiting pressure block is installed on the base, and a limiting pin is inserted into the bottom of the limiting pressure groove. A pressing mechanism 34 is installed on the base next to the limiting pressure block. In use, the limiting pressure grooves on each limiting pressure block form the mounting groove of the chair back frame. After the chair back frame is placed into the mounting groove, the upper tube surface of the chair back frame is fixed by the pressing mechanism to achieve the fixation of the chair back frame.

[0034] In this embodiment, to achieve the fixation of the chair back frame, the specific structure of the pressing mechanism is as follows: The pressing mechanism further includes a vertically arranged pressing cylinder 35, with the telescopic end of the pressing cylinder facing upwards. A hinge seat 36 is provided on the upper part of the cylinder sleeve next to the telescopic end. A swing rod 37 is rotatably connected to the hinge seat. The lower end of the swing rod is rotatably connected to the hinge seat via a rotating shaft. A pressing claw 38 is rotatably connected to the upper end of the swing rod. The middle part of the pressing claw is rotatably connected to the upper end of the swing rod. The pressing end of the pressing claw is located above the limiting pressing groove. The telescopic end of the pressing cylinder is rotatably connected to the non-pressing end of the pressing claw. In use... By extending and retracting the telescopic end of the pressing cylinder, the non-pressing end of the pressing claw swings up and down, thereby achieving the rotation of the pressing claw. Finally, the pressing end of the pressing claw presses down or rises, thus fixing the chair back frame. The specific structure of the pressing claw is as follows: the pressing claw includes a pressing block 39, one end of which is provided with a pressing claw hinge seat 40. The swing rod is rotatably connected to the middle of the pressing claw hinge seat, the telescopic end of the pressing cylinder is rotatably connected to the end of the pressing claw hinge seat, and the other end of the pressing block is equipped with a pressing claw block 41. The pressing claw block is L-shaped, with the horizontal part of the pressing claw block fixed on the pressing block and the vertical end located above the limiting pressing groove, thus fixing the chair back frame.

[0035] In this embodiment, a rib fixing seat 42 is provided on the middle part of the base corresponding to the rib 49 to be welded in the chair back frame. The rib fixing seat is provided with a rib fixing groove 43 corresponding to the rib. A rib pressing block 44 is provided on the pressing mechanism near the rib. The rib pressing block is L-shaped. The horizontal part of the rib pressing block is fixed on the horizontal part of the pressing claw block. The vertical part of the rib pressing block is located above the rib fixing groove. When the vertical part of the pressing claw block is pressed down, it will drive the vertical part of the rib pressing block to be pressed down, thereby fixing the rib.

[0036] In this embodiment, for the sake of reasonable design, a switch group 45 for starting each cylinder is installed on the base. Since this is existing technology, it will not be described in detail.

[0037] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0038] If the terms "first" or "second" are used in this document to specify components, those skilled in the art should know that the use of "first" or "second" is merely for the purpose of distinguishing components in description, and unless otherwise stated, the above terms have no special meaning.

[0039] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by integral molding using a casting process) (except where it is obviously impossible to use an integral molding process).

[0040] Furthermore, the orientations or positional relationships indicated by terms such as "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in any of the technical solutions disclosed in this utility model are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this patent. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent. In addition, unless otherwise stated, the terms used to indicate shape in any of the technical solutions disclosed in this utility model include shapes that are similar to, close to, or approximate with it.

[0041] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A single prone positioner back frame welding fixture structure, characterized in that: The base is provided with a positioning and pressing assembly corresponding to the back frame in the middle, a back lying device fixing assembly on one side of the front side of the base, and a hinge fixing assembly on the other side.

2. The backrest welding tooling structure of claim 1, wherein: The back lying device fixing assembly comprises a back lying device pushing cylinder horizontally and transversely mounted on the base, with the telescopic end thereof directed to the middle of the base plate, and a sliding block connected to the telescopic end of the back lying device pushing cylinder, and at least two positioning pins provided on the sliding block corresponding to the back lying device.

3. The backrest welding fixture structure of claim 2, wherein: The sliding block is provided with a positioning block corresponding to the positioning pins on the side directed to the middle of the base, and an L-shaped connecting block horizontally and transversely mounted on the side of the positioning block, with the horizontal and transverse part of the L-shaped connecting block fixed to the side of the positioning block, and the positioning pins mounted on the end of the horizontal and longitudinal part of the L-shaped connecting block.

4. The backrest welding fixture structure of claim 1, wherein: The hinge fixing assembly comprises a positioning pushing cylinder horizontally and transversely mounted on the base, with the telescopic end thereof directed to the middle of the base plate, and a fixing block connected to the telescopic end of the positioning pushing cylinder, and an L-shaped plug-in block vertically mounted on the fixing block, with the horizontal part of the L-shaped plug-in block fixed to the fixing block, and a plug pin horizontally provided on the vertical part of the L-shaped plug-in block and matched with the hinge.

5. The backrest welding fixture structure of claim 4, wherein: The auxiliary fixing assembly comprises left and right symmetrical support frames, and an auxiliary mounting cylinder horizontally mounted on the support frame, with the telescopic end thereof directed to the direction of the back lying device fixing assembly or the hinge fixing assembly on the same side, and a limiting clamping plate mounted on the telescopic end of the auxiliary mounting cylinder corresponding to the back lying device fixing assembly and used for abutting against the inner side of the back lying device, and a limiting abutting structure mounted on the telescopic end of the auxiliary mounting cylinder corresponding to the hinge fixing assembly and used for abutting against the inner side of the hinge of the back frame.

6. The backrest welding fixture structure of claim 5, wherein: One end of the plate body of the limiting clamping plate is fixed to the end of the corresponding auxiliary mounting cylinder, and the other end is provided with an abutting block A, with a positioning hole provided on the abutting block A corresponding to the positioning pin; the limiting abutting structure comprises an abutting block B fixed to the end of the corresponding auxiliary mounting cylinder, and a limiting strip plate connected to the abutting block B, with a plug hole provided on the end of the limiting strip plate corresponding to the plug pin, and a notch in communication with the plug hole provided on the edge of the end of the strip plate.

7. The backrest welding fixture structure of claim 6, wherein: The support frame comprises a support seat, and a vertical support plate mounted on the support seat, with the auxiliary mounting cylinder horizontally and transversely mounted on one side of the plate surface of the support plate, and a limiting mechanism mounted on the other side of the plate surface of the support plate and used for limiting the limiting distance of the limiting clamping plate or the limiting abutting structure, which is an L-shaped limiting block horizontally arranged, with the end of the horizontal and transverse part of the L-shaped limiting block fixed to the support plate, the horizontal and longitudinal part of the L-shaped limiting block located in front of the telescopic direction of the limiting clamping plate or the limiting abutting structure, and a rubber block provided on the horizontal and longitudinal part of the L-shaped limiting block corresponding to the limiting clamping plate or the limiting abutting structure.

8. The backrest welding fixture structure of claim 1, wherein: The positioning and pressing assembly comprises a plurality of pressing mechanisms distributed along the frame of the backrest framework, each of the pressing mechanisms comprises a limiting pressing block, a limiting pressing groove is arranged on the limiting pressing block corresponding to the frame of the backrest framework, the limiting pressing block is installed on a base, a limiting pin is inserted into the bottom of the limiting pressing groove, and a pressing mechanism is installed on the base beside the limiting pressing block.

9. The backrest welding fixture structure of claim 8, wherein: The pressing mechanism further comprises a vertically arranged pressing cylinder, the telescopic end of the pressing cylinder is upward, a hinged seat is arranged on the cylinder sleeve of the pressing cylinder beside the telescopic end, a swing rod is rotatably connected to the hinged seat, a pressing claw is rotatably connected to the upper end of the swing rod, the middle part of the pressing claw is rotatably connected to the upper end of the swing rod, the pressing end of the pressing claw is located on the limiting pressing groove, and the telescopic end of the pressing cylinder is rotatably connected to the non-pressing end of the pressing claw.

10. The backrest welding tooling structure of claim 9, wherein: The pressing claw comprises a pressing block, a pressing claw hinged seat is arranged on one end of the pressing block, the swing rod is rotatably connected to the middle part of the pressing claw hinged seat, the telescopic end of the pressing cylinder is rotatably connected to the end of the pressing claw hinged seat, and a pressing claw block is installed on the other end of the pressing block.

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