Seat base assembly process

Abstract

This invention relates to a seat assembly process, comprising the following steps: (1) assembling the seat back connecting mechanism and the single seat back frame on a seat back frame assembly welding fixture using the two side back-flip handles and the forward-flipping mechanism, and welding the back-flip handles and the forward-flipping mechanism; (2) installing the front leg frame assembly handle rubber sleeve on the front leg frame assembly fixture; (3) assembling the back frame assembly, the front leg frame assembly, and the rear leg frame assembly on the seat frame assembly fixture. This seat assembly process of the present invention, by using special fixtures or tooling for seat back frame assembly welding, handle rubber sleeve installation, and seat frame assembly, is convenient to use, effectively improves production efficiency, saves time and labor, and allows one person to operate the entire process, reducing labor costs.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and in particular to a seat assembly process. Background Technology

[0002] The single business chairs in luxury business vehicles use a footrest locking system, which not only adds a sliding function to the fixed track, but also allows the entire chair to flip forward, making it easier for passengers to get in and out of the back seat. Therefore, the strength and safety of the seats are higher than other types. In addition, a large amount of aluminum material is used to achieve the weight reduction of the seats, which makes the installation complex, the process requirements high, the assembly time long, and this type of seat is also an optional model, which is not suitable for mass production on the assembly line.

[0003] The main components of a single-seat business chair are the backrest assembly, front leg assembly, and rear leg assembly. The backrest assembly consists of the seat-back connection mechanism, single-seat backrest, backrest tilt handle, and tilt mechanism. Currently, the lack of specialized tooling for assembling single-seat business chairs results in inefficient assembly processes, requiring at least two people to complete each step, leading to high labor costs. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a seat assembly process that saves time and effort, improves production efficiency, and reduces labor costs.

[0005] The present invention is implemented by the following scheme: a seat assembly process, including the following steps: (1) assembling the seat back connection mechanism and the single seat back frame on the seat back frame assembly welding fixture using the two sides back flip handle and the flip mechanism, and welding the back flip handle and the flip mechanism; (2) installing the front leg assembly handle rubber sleeve on the front leg assembly fixture; (3) assembling the back frame assembly, the front leg assembly and the rear leg assembly on the seat frame assembly fixture.

[0006] In this embodiment, the seat back frame assembly welding fixture includes a worktable supported by a frame. A connecting seat driven to move back and forth by a front top cylinder is provided in the middle of the worktable. A pair of foot positioning blocks are provided on the upper end of the connecting seat. A left support and a right support are provided on the left and right sides of the worktable. A first push-pull quick clamp is installed on the left support, and a second push-pull quick clamp is installed on the right support. The clamping ends of the first and second push-pull quick clamps face the middle and are respectively connected to a first flipping mechanism positioning pin and a second flipping mechanism positioning pin.

[0007] In this embodiment, a left tube frame positioning plate and a right tube frame positioning plate are provided between the left and right supports, and a lower tube frame positioning groove is provided at the upper end of the left and right tube frame positioning plates; the left and right supports are provided with limiting sleeves that are driven to extend and retract by the left top cylinder and the right top cylinder respectively; a pull-out waste residue collection box located below the worktable is installed on the frame.

[0008] In this embodiment, the front tripod assembly fixture includes a support rod positioning block for supporting the front tripod assembly support rod, and a left-turning cylinder and a right-turning cylinder for pressing the left and right sides of the front tripod assembly. A support column is provided between the left and right-turning cylinders. A lever is hinged to the upper end of the support column. The rear end of the lever is connected to a transverse pressure plate for pressing the handle rubber sleeve down to the sheet metal of the handles at both ends of the front tripod assembly. A push cylinder is provided below the front end of the lever.

[0009] In this embodiment, the seat frame assembly fixture includes a base plate. The upper front part of the base plate is provided with a pair of left and right front leg positioning blocks for fixing the front end of the front leg assembly. The upper middle part of the base plate is provided with a pair of left and right support blocks for supporting the rear end of the front leg assembly. The upper rear part of the base plate is provided with a pair of left and right rear leg positioning blocks for fixing the rear leg assembly. The upper middle part of the base plate is also provided with a connecting rod positioning mechanism for fixing the connecting rod of the front leg assembly.

[0010] In this embodiment, the connecting rod positioning mechanism includes an inverted L-shaped clamp, a clamp top cylinder is provided behind the clamp, the clamp top cylinder is connected to a top cylinder mounting plate on its front side, a clamp connecting plate extending forward is fixedly connected to the top cylinder mounting plate, the lower end of the vertical part of the clamp is hinged to the clamp connecting plate, and the telescopic rod of the clamp top cylinder passes forward through the top cylinder mounting plate and is movably connected to the vertical part of the clamp.

[0011] In this embodiment, a rear leg positioning mechanism is provided between the two rear leg positioning blocks. The rear leg positioning mechanism includes a positioning bracket. The left side of the positioning bracket is provided with a left step shaft positioning pin that limits the left inner step shaft of the rear leg assembly, and the right side of the positioning bracket is provided with a right step shaft positioning pin that limits the right inner step shaft of the rear leg assembly. Both the left and right step shaft positioning pins are driven to extend and retract by a cylinder.

[0012] In this embodiment, a fixed bracket is provided below the positioning bracket and fixedly connected to the base plate. A movable plate is connected to the fixed bracket via a guide rail and a slider. The lower end of the positioning bracket is connected to the movable plate. A cylinder for driving the movable plate to move back and forth is installed on the fixed bracket.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The seat assembly process of the present invention uses special fixtures or tooling to assemble and weld the seat back frame, install the handle rubber sleeve and assemble the seat frame. It is convenient to use, effectively improves production efficiency, saves time and labor, and enables one person to operate the entire process, thereby reducing labor costs.

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0015] Figure 1 This is a perspective view of the seat back frame assembly and welding fixture according to an embodiment of the present invention;

[0016] Figure 2 This is a top view of the seat back frame assembly and welding fixture according to an embodiment of the present invention;

[0017] Figure 3 This is a partial schematic diagram of the seat back frame assembly and welding fixture in use according to an embodiment of the present invention;

[0018] Figure 4 This is a left view of the seat back frame according to an embodiment of the present invention;

[0019] Figure 5 This is a right view of the seat back frame according to an embodiment of the present invention;

[0020] Figure 6 This is a partial schematic diagram of the installation of the forward-folding mechanism on the seat back frame according to an embodiment of the present invention;

[0021] Figure 7 This is a partial schematic diagram of the installation of the connecting piece and stepped pad on the seat back frame according to an embodiment of the present invention;

[0022] Figure 8 This is a partial schematic diagram of the installation of the backrest fold-forward handle on the seat back frame according to an embodiment of the present invention;

[0023] Figure 9 This is a schematic diagram of the welding state of the forward tilting mechanism according to an embodiment of the present invention;

[0024] Figure 10 yes Figure 9 Enlarged view of a portion of point K;

[0025] Figure 11 This is a top view of the front scaffold assembly tooling in use according to an embodiment of the present invention;

[0026] Figure 12 This is a perspective view of the front leg assembly tooling in use according to an embodiment of the present invention;

[0027] Figure 13 This is a schematic diagram of the workbench structure according to an embodiment of the present invention;

[0028] Figure 14 This is a perspective view of the seat frame assembly fixture in use according to an embodiment of the present invention;

[0029] Figure 15 This is a top view of the seat frame assembly fixture in use according to an embodiment of the present invention;

[0030] Figure 16 This is a schematic diagram of the installation process of the back frame assembly according to an embodiment of the present invention;

[0031] Figure 17 This is a schematic diagram of the side panel installation process according to an embodiment of the present invention;

[0032] Figure 18 This is a schematic diagram of the installation process of the buffer cover according to an embodiment of the present invention;

[0033] Figure 19 This is a schematic diagram of the installation process of the front handle assembly according to an embodiment of the present invention; Detailed Implementation

[0034] 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.

[0035] 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.

[0036] A seat assembly process includes the following steps: (1) assembling the seat back connection mechanism and the single seat back frame on the seat back frame assembly welding fixture using the two sides back flip handles and the flip mechanism, and welding the back flip handles and the flip mechanism; (2) installing the front leg assembly handle rubber sleeve on the front leg assembly fixture 34; (3) assembling the back frame assembly, the front leg assembly and the rear leg assembly on the seat frame assembly fixture.

[0037] In this embodiment, as Figures 1-3As shown, the seat back frame assembly and welding fixture includes a worktable 1 supported by a frame 2. A connecting seat, driven to move back and forth by a front cylinder 4, is located in the center of the worktable. The front cylinder 4 is positioned in front of the connecting seat. A pair of L-shaped foot positioning blocks 5 are located on the upper end of the connecting seat. A left support and a right support are located on the left and right sides of the worktable. A first push-pull quick clamp 8 is mounted on the left support, and a second push-pull quick clamp 6 is mounted on the right support. The clamping ends of the first and second push-pull quick clamps face the center and are respectively connected to a first flipping mechanism positioning pin 9 and a second flipping mechanism positioning pin 7. The foot positioning blocks 5 are used to fix the linkage rod of the seat back connecting mechanism 16 on the seat back frame, ensuring the installation angle and facilitating the insertion of the single seat back frame 15 into the seat back connecting mechanism 16. The front cylinder 4 drives the connecting seat to move the foot positioning blocks 5, thereby fixing the upper tube frame of the seat back connecting mechanism 16. The second push-pull quick clamp 6 extends out of the positioning hole of the seat back forward flip handle 18 by pushing the second flip mechanism positioning pin 7 to fix it; the first push-pull quick clamp 8 extends out of the positioning hole of the seat back forward flip mechanism 17 by the first flip mechanism positioning pin 9 to fix it, and welding can only be performed after it is fixed.

[0038] In this embodiment, a left tube frame positioning plate 12 and a right tube frame positioning plate 13 are provided between the left and right supports. The upper ends of the left and right tube frame positioning plates are provided with lower tube frame positioning grooves. The left tube frame positioning plate 12 and the right tube frame positioning plate 13 are used to fix the lower tube frame of the seat back connection mechanism 16 of the seat back frame.

[0039] In this embodiment, the left and right supports are provided with limiting sleeves that are driven to extend and retract by the left top cylinder 11 and the right top cylinder 10, respectively; the left top cylinder 11 and the right top cylinder 10 are used to limit the traction pins at both ends of the seat back connecting mechanism 16 on the seat back frame.

[0040] In this embodiment, a pull-out waste slag collection box 3 is installed on the frame below the workbench surface. The waste slag collection box 3 is used to collect welding slag during the welding process.

[0041] In this embodiment, the bottom of the connecting seat is slidably connected to the worktable surface via a guide rail and a slider 14.

[0042] Step (1) Specific operation process: such as Figures 4-10As shown, the seat-back connection mechanism 16 is first installed on the fixture, and the lower tube frame of the seat-back connection mechanism 16 is placed into the lower tube frame positioning slots of the left tube frame positioning plate 12 and the right tube frame positioning plate 13; the front top cylinder 4 drives the connecting seat to move backward, so that the upper bracket positioning block 5 of the connecting seat fixes the upper tube frame of the seat-back connection mechanism 16; the left top cylinder 11 and the right top cylinder 10 drive the limiting sleeves on both sides to extend out to limit the traction pins at both ends of the seat-back connection mechanism 16. Then, fit the single-seat back frame 15 into the seat-back connecting mechanism 16, and insert the staggered bolt 24 into the locking hole of the forward tilting mechanism 17 from the right outer side of the back frame. Take the connecting piece 25 and fit it into the staggered bolt 24 from the right inner side of the back frame. Its upper positioning hole fits into the positioning pin on the inner side of the back frame. Then assemble the step pad 26 into the connecting piece 25. Its semi-circular groove limits and fixes the positioning pin on the inner side of the back frame. Finally, fix it with the nut 27. Bolt torque: 350-420kgf. The two fixing pieces of the forward tilting mechanism 17 need to be fitted into the right side anti-loosening positioning pin A20 and anti-loosening positioning pin B21 of the seat-back connecting mechanism 16. Fit the staggered bolt 22 into the locking hole of the bushing 23 and lock the back frame from the left outer side of the back frame. Install the back-flip handle 18 into the corresponding end of the seat-back connecting mechanism 16. The first flipping mechanism positioning pin 9 clamps the positioning hole 19 of the forward flipping mechanism 17 under the action of the first push-pull quick clamp 8. Use the welding gun 30 to spot weld the right side anti-loosening positioning pin A20 and anti-loosening positioning pin B21 of the seat-back connecting mechanism 16. The specific welding process is to open the gas valve of the welding machine 28 and CO2 cylinder 29, the welding current is 80-130A, the welding machine voltage is 18-23V, the CO2 gas flow rate is 7-10L / MIN, and the manual welding wire diameter is 1.2MM. The second flipping mechanism positioning pin 7 clamps the positioning hole of the back-flip handle 18 under the action of the second push-pull quick clamp 6. The welding method is the same as that of the forward flipping mechanism 17. At this time, the back-flip handle 18 is actuated synchronously with the forward flipping mechanism 17 to unlock the back frame lock, so as to achieve the purpose of forward flipping of the single seat back frame 15. Move the back frame assembly 51 to the next process for assembly.

[0043] In this embodiment, as Figures 11-13 As shown, the front tripod assembly fixture 34 includes a support rod positioning block 79 for supporting the support rod of the front tripod assembly 48, and a left-turning cylinder 77 and a right-turning cylinder 78 for pressing the left and right sides of the front tripod assembly 48. A support column is provided between the left and right-turning cylinders. A lever is hinged to the upper end of the support column. The rear end of the lever is connected to a transverse pressure plate 76 for pressing the handle rubber sleeve 49 down onto the handle sheet metal at both ends of the front tripod assembly 48. A push cylinder 75 is provided below the front end of the lever. The front tripod assembly fixture 34 is used to install the handle rubber sleeve 49 on the front tripod assembly 48. When the push cylinder 75 pushes the front end of the lever upward, the transverse pressure plate 76 at the rear end of the lever presses down, pressing the handle rubber sleeve 49 onto the handle sheet metal at both ends of the front tripod assembly 48. A mechanical valve 80 is provided at the upper end of the support column to sense whether the transverse pressure plate 76 is in place.

[0044] The front leg assembly fixture 34 is set on the workbench 33, on which a material rack 35 and a material box 36 are placed. The seat frame assembly fixture is set next to the workbench 33.

[0045] The specific operation process of step (2): Place the front leg assembly 48 on the front leg assembly fixture 34. The support rod positioning block 79 supports the support rod of the front leg assembly 48. Pre-install the two handle rubber sleeves 49 onto the handle sheet metal of the front leg assembly 48. The left corner cylinder 77 and the right corner cylinder 78 clamp the front leg assembly 48. The push cylinder 75 moves to make the transverse pressure plate 76 press down to assemble the handle rubber sleeves 49 into place.

[0046] In this embodiment, as Figures 14-15 As shown, the seat frame assembly fixture includes a base plate 32. The front upper part of the base plate 32 has a pair of left and right front leg positioning blocks 41 for fixing the front end of the front leg assembly 48. The middle upper part of the base plate has a pair of left and right support blocks for supporting the rear end of the front leg assembly 48. The rear upper part of the base plate has a pair of left and right rear leg positioning blocks 42 for fixing the rear leg assembly 50. The middle upper part of the base plate also has a connecting rod positioning mechanism 39 for fixing the connecting rod of the front leg assembly 48. This seat frame assembly fixture is used to place and fix the front leg assembly 48 and the rear leg assembly 50. The front leg positioning block group 41 is used to fix the front leg assembly 48, and the rear leg positioning block group 42 is used to fix the rear leg assembly 50.

[0047] In this embodiment, the connecting rod positioning mechanism 39 includes an inverted L-shaped clamp 40. A clamp top cylinder 38 is provided behind the clamp 40. The clamp top cylinder 38 is connected to a top cylinder mounting plate on its front side. A clamp connecting plate extending forward is fixedly connected to the top cylinder mounting plate. The lower end of the vertical part of the clamp is hinged to the clamp connecting plate. The telescopic rod of the clamp top cylinder 38 passes forward through the top cylinder mounting plate and is movably connected to the vertical part of the clamp. The vertical part of the clamp is hinged to the telescopic rod of the clamp top cylinder through a pin. A vertical elongated hole that cooperates with the pin is provided on the vertical part of the clamp. When the telescopic rod of the clamp top cylinder extends forward, it can drive the clamp to press the connecting rod of the front leg assembly 48.

[0048] In this embodiment, a rear leg positioning mechanism 43 is provided between the two rear leg positioning blocks 42. The rear leg positioning mechanism 43 includes a positioning bracket 44. The left side of the positioning bracket is provided with a left step shaft positioning pin 45 for limiting the left inner step shaft 54 ​​of the rear leg assembly 50, and the right side of the positioning bracket is provided with a right step shaft positioning pin 45 for limiting the right inner step shaft 55 of the rear leg assembly 50. Both the left and right step shaft positioning pins 45 are driven to extend and retract. The left step shaft positioning pin 45 and the right step shaft positioning pin 46 are respectively fixedly connected to the drive end of the corresponding cylinder. When the cylinder drives the left step shaft positioning pin 45 to extend outward, it limits the left inner step shaft 54 ​​of the rear leg assembly 50. When the cylinder drives the right step shaft positioning pin 46 to extend outward, it limits the right inner step shaft 55 of the rear leg assembly 50. The left and right step shaft positioning pins are hollow structures and are sleeved on the corresponding step shafts to ensure that the back frame assembly 51 fixes the rear leg assembly 50. After the rear leg assembly 50 and the back frame assembly 51 are limited, they will not shake and no manual assistance is required. The assembly can be performed by a single person.

[0049] In this embodiment, a fixed bracket is fixedly connected to the base plate below the positioning bracket 42. A movable plate that can move back and forth is connected to the fixed bracket via a guide rail and a slider 47. The lower end of the positioning bracket is connected to the movable plate. A cylinder for driving the movable plate to move back and forth is installed on the fixed bracket. The extension and retraction of the cylinder can adjust the position of the rear foot positioning mechanism 43. The rear foot positioning mechanism 43 enhances its stability through the guide rail and the slider 47.

[0050] The specific operation process of step (3) is as follows: Figures 14-19 As shown, the front leg assembly 48 and the rear leg assembly 50 are installed in the seat frame assembly fixture. The front leg assembly 48 is placed in the groove with a positioning pin on the front leg positioning block 41. The actuating handle rubber sleeve 49 engages the front leg positioning block 41 with the positioning pin. The rear leg assembly 55 is fixed in the groove with a positioning pin on the rear leg positioning block 42. The locking teeth of the rear leg assembly 50 are movable mechanisms that can directly engage with the positioning pin of the rear leg positioning block 42. The actuating top cylinder 38 and its connecting support rod positioning mechanism 39 clamp the front leg assembly 48 connecting rod with the clamp 40. The backrest assembly 51 is then inserted into the rear leg assembly 50. The stepped shaft 54 ​​is inserted from the inside out to connect the rear leg assembly 50 and the back frame assembly 51 on the right side. The stepped shaft 55 is inserted from the inside out to connect the rear leg assembly 50 and the back frame assembly 51 on the left side. The cylinder drives the left and right stepped shaft positioning pins to limit the stepped shafts 54 and 55 on both sides of the rear leg assembly 50. After the rear leg assembly 50 and the back frame assembly 51 are limited, they will not shake and no manual assistance is required. They can be assembled by a single person. Take the leg connecting plate 52 to fix the front leg assembly 48 and the rear leg assembly 50. After the leg connecting plate 52 is snapped into the positioning pin of the front leg assembly 48, it is fixed with the side slide 53 to form the seat assembly 37.

[0051] Then, take the left side plate 56 and snap it into the left side of the seat assembly 37. Its material is a one-piece molded magnesium-aluminum alloy. It is used to connect and fix the front leg assembly 48, the rear leg assembly 50, and the back frame assembly 51 on the left side. The right side plate 57 is snapped into the right side of the seat assembly 37. Its material is a one-piece molded magnesium-aluminum alloy. It is used to connect and fix the front leg assembly 48, the rear leg assembly 50, and the back frame assembly 51 on the right side. The front tube frame assembly 58 is assembled between the left side plate 56 and the right side plate 57 to strengthen the overall seat frame structure; the stud bolt 65 is used to lock the left side plate 56 to the seat back connection mechanism 16, with a stud bolt torque of 160-200 kgf; the nut 66 is used to lock the left side plate 56 to the rear leg assembly 50, with a nut torque of 180-320 kgf; the flat head bolt 59 is fitted into the stud washer 60 to lock the left side of the left side plate 56 to the left side of the front tube frame assembly 58, with a nut torque of 300-340 kgf; the stud bolt 64 is used to lock the right side plate 57 to the seat back connection mechanism 16, with a stud bolt torque of 160-200 kgf; the nut 63 is used to lock the right side plate 57 to the rear leg assembly 50, with a nut torque of 1... 80-320kgf; Flat head bolt 61 is inserted into step washer 62 for right side plate 57 and front tube frame assembly 58 right side locking, nut torque: 300-340kgf; Insert buffer cover 69 into the inside of right side plate 57, insert buffer spring 68 into buffer rod 67 from the bottom to hold buffer cover 69, take Phillips bolt 70 to lock the right side of front leg assembly 48; front handle assembly 71 is used for back frame assembly 51 to flip forward, disc slide 74 fixes front handle assembly 71 to front leg assembly 48 linkage plate, Phillips bolt 72 locks the rear end of front handle assembly 71 to rear leg assembly 50, Phillips step bolt 73 locks the front and rear leg assemblies to left side plate 56 from the inside, Phillips step bolt 73 locks the front and rear leg assemblies to right side plate 57 from the inside.

[0052] The clamping cylinder 38 and the left and right stepped shaft positioning pins return to their original positions; the actuation of the backrest tilt handle 18, in conjunction with the tilt mechanism 17, unlocks the single-seat backrest 15 and tilts it down to fit the seat frame. The backrest tilt handle 18 dampens the internal mechanism of the single-seat backrest 15, preventing it from tilting backward when unlocked, thus enhancing its stability and allowing it to tilt forward within the limited space of the vehicle body. The actuation of the backrest tilt handle 18 returns the single-seat backrest 15 to its original position. The actuation of the front handle assembly 71, which is linked to the front footrest assembly 48 via its own connecting piece, causes the front footrest assembly 48 to tilt forward. The frame assembly 48 is connected to the rear frame assembly 50 via the footrest connecting plate 52. During the unlocking and forward tilting of the seat frame by the front handle assembly 71, the rear frame assembly 50 and the locking teeth of the rear frame assembly 50 are movable mechanisms that automatically unlock when the seat angle changes. The seat frame assembly 37 is assisted to tilt forward by the reaction action of the buffer spring 68, reducing the risk of tilting backward during the unlocking process. The handle rubber sleeves 49 on both sides of the front frame assembly 48 are actuated. After the front frame assembly 48 is unlocked, the seat frame assembly 37 can be removed, and the operation is completed.

[0053] This invention's seat assembly process allows for one-person operation of the entire process through a series of steps including back frame welding, back frame assembly, and accessory assembly. By replacing the complex steel frame assembly with a magnesium-aluminum alloy, the weight of the entire chair is reduced, and safety is improved. Furthermore, the back frame toothed plate mechanism pin is fixed by welding connecting plates to achieve synchronous linkage unlocking, effectively avoiding interference caused by loose or overtightened bolts. The leg mechanism is unlocked by connecting the leg connecting plate in series with the front and rear leg mechanisms, and a buffer mechanism is used instead of pneumatic springs to more effectively assist the chair in tilting forward, which not only reduces material costs but also improves production efficiency.

[0054] Unless otherwise stated, if any of the technical solutions disclosed in this invention specify a numerical range, then the disclosed numerical range is a preferred numerical range. Anyone 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 invention discloses only some numerical values ​​to illustrate the technical solutions of this invention. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this invention.

[0055] If this invention discloses or relates to mutually fixedly connected components or structural parts, 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 in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0056] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0057] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A seat base assembly process characterized by: Includes the following steps: (1) Assemble the seat back connecting mechanism and single seat back frame on the seat back frame assembly welding fixture using the two-sided back-flip handle and the forward-flipping mechanism, and weld the back-flip handle and the forward-flipping mechanism; (2) Install the front leg assembly handle rubber sleeve on the front leg assembly fixture; (3) Assemble the back frame assembly, front leg assembly and rear leg assembly on the seat frame assembly fixture; The seat back frame assembly welding fixture includes a worktable supported by a frame, a connecting seat driven to move back and forth by a front top cylinder in the middle of the worktable, and a pair of leg positioning blocks at the upper end of the connecting seat; a left bracket and a right bracket are provided on the left and right sides of the worktable, a first push-pull quick clamp is installed on the left bracket, and a second push-pull quick clamp is installed on the right bracket, the clamping ends of the first and second push-pull quick clamps face the middle and are respectively connected to the first flipping mechanism positioning pin and the second flipping mechanism positioning pin; the second push-pull quick clamp extends by pushing the second flipping mechanism positioning pin to fix the seat back frame. The upper backrest forward tilt handle has a positioning hole; the first push-pull quick clamp extends through the first tilt mechanism positioning pin to fix the positioning hole of the forward tilt mechanism on the seat back frame; the front leg assembly fixture includes a support rod positioning block for supporting the front leg assembly support rod and a left and right corner cylinder for pressing the left and right sides of the front leg assembly, a support column is provided between the left and right corner cylinders, the upper end of the support column is hinged with a lever, and the rear end of the lever is connected to press the handle rubber sleeve down onto the sheet metal of the handles at both ends of the front leg assembly. A horizontal pressure plate is provided, and a push cylinder is provided below the front end of the lever; the seat frame assembly fixture includes a base plate, and a pair of left and right front leg positioning blocks for fixing the front end of the front leg assembly are provided on the upper front part of the base plate, a pair of left and right support blocks for supporting the rear end of the front leg assembly are provided on the upper middle part of the base plate, and a pair of left and right rear leg positioning blocks for fixing the rear leg assembly are provided on the upper rear part of the base plate; a connecting rod positioning mechanism for fixing the connecting rod of the front leg assembly is also provided on the upper middle part of the base plate.

2. The seat assembly process of claim 1, wherein: A left pipe rack positioning plate and a right pipe rack positioning plate are provided between the left and right supports, and a lower pipe rack positioning groove is provided at the upper end of the left and right pipe rack positioning plates; the left support is provided with a limiting sleeve that is driven to extend and retract by the left top cylinder, and the right support is provided with a limiting sleeve that is driven to extend and retract by the right top cylinder; a pull-out waste residue collection box is installed on the frame below the worktable.

3. The seat assembly process of claim 1 wherein: The connecting rod positioning mechanism includes an inverted L-shaped clamp, a clamp top cylinder is provided behind the clamp, the clamp top cylinder is connected to a top cylinder mounting plate on its front side, a clamp connecting plate extending forward is fixedly connected to the top cylinder mounting plate, the lower end of the vertical part of the clamp is hinged to the clamp connecting plate, and the telescopic rod of the clamp top cylinder passes forward through the top cylinder mounting plate and is movably connected to the vertical part of the clamp.

4. The seat assembly process of claim 1 wherein: A rear leg positioning mechanism is provided between the two rear leg positioning blocks. The rear leg positioning mechanism includes a positioning bracket. The left side of the positioning bracket is provided with a left step shaft positioning pin that limits the left inner step shaft of the rear leg assembly, and the right side of the positioning bracket is provided with a right step shaft positioning pin that limits the right inner step shaft of the rear leg assembly. Both the left and right step shaft positioning pins are driven to extend and retract by a cylinder.

5. The seat base assembly process of claim 4, wherein: The positioning bracket is fixedly connected to the base plate below it. A movable plate is connected to the fixed bracket via a guide rail and a slider. The lower end of the positioning bracket is connected to the movable plate. A cylinder for driving the movable plate to move back and forth is installed on the fixed bracket.

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