Automobile interior armrest piece with positioning structure and flexible welding equipment thereof

Abstract

The invention belongs to the technical field of automobile interior trim part production, and particularly relates to an automobile interior trim armrest part with a positioning structure and flexible welding equipment of the automobile interior trim armrest part. The invention provides an automotive trim handrail piece which is mainly composed of a middle handrail block and side handrail blocks arranged on the two sides of the middle handrail block. The middle handrail block serves as a main bearing part. The side handrail block provides holding comfort; the positioning protrusions of the step positioning grooves of the middle handrail block jointly form a positioning structure capable of preventing falling off, the welding accuracy is improved, and the problems of cracking and the like are not prone to occurring after welding. According to the flexible welding equipment, the hydraulic self-clamping mechanism is used for clamping and positioning the middle handrail block, the pressing push rod is used for driving the side handrail blocks adsorbed by the suction cups to move towards the middle handrail block, and pre-assembly of the side handrail blocks on the two sides and the middle handrail block is achieved; and then an outer seam welding mechanism is used for welding outer seams formed by the armrest blocks on the two side edges and the armrest block in the middle, and 0.1 mm-level seam control is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive interior part production, and particularly relates to an automotive interior armrest part with a positioning structure and its flexible welding equipment. Background Art

[0002] In the field of automotive interior manufacturing, it has become an industry development trend to assemble combined automotive armrests using welding technology. This precision manufacturing technology not only greatly improves product performance but also realizes the multiple pursuits of the automotive industry for quality, efficiency, and environmental protection.

[0003] Through the material fusion at the molecular level, the welding process enables the connection part of the combined automotive armrest to form a seamless joint structure. Compared with traditional bolt connection or adhesive bonding processes, the tensile strength of the welded joint can be increased by 30 - 50%, effectively bearing the mechanical stress under dynamic working conditions. Especially in a high-frequency vibration environment, the overall welded structure can eliminate the fretting wear between the connecting parts and extend the product service life. The automated welding workstation integrates a vision positioning system and can complete the precise welding of a single solder joint within 0.8 seconds, with the efficiency increased by more than 5 times compared to manual assembly. Although the initial investment in welding equipment is relatively high, the cost advantage in the whole life cycle is significant. The welding process eliminates the use of consumables such as fasteners and adhesives, and automated production reduces manual intervention and shortens the personnel training cycle. The welding process reduces the total assembly cost of the interior parts of a single vehicle model and shortens the equipment investment return period. High-frequency vibration welding can achieve a seam control of 0.1 mm level, with the surface roughness Ra ≤ 0.8 μm, meeting the appearance standard of Class A surface. The seamless welding technology makes the joint part and the body present perfect visual continuity, and the gap uniformity is controlled within ±0.05 mm.

[0004] Traditional automotive interior armrest parts have deficiencies. One is that they lack a positioning structure, which affects the accuracy of subsequent welding and cannot form anti-disengagement positioning after being combined into one body, resulting in problems such as cracking easily occurring later. The other is that due to the lack of flexible welding equipment suitable for combined automotive armrests, the efficiency of industrial production is affected. Therefore, it is necessary to optimize and improve traditional automotive interior armrest parts. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above problems existing in the prior art and provide an automotive interior armrest part with a positioning structure and its flexible welding equipment.

[0006] To achieve the above technical purposes and reach the above technical effects, the present invention is realized through the following technical solutions:

[0007] The present invention provides an automotive interior armrest part with a positioning structure, which includes a middle armrest block and side armrest blocks arranged on both sides of it;

[0008] The middle centering block includes a middle block body. An intermediate armrest groove is formed inside the middle block body. The middle block body is provided with a number of stepped positioning grooves around the intermediate armrest groove. The wide ends of adjacent two stepped positioning grooves face in opposite directions. The middle block body is provided with middle hanging grooves near both ends of one side.

[0009] The side armrest block includes a side block body. A side armrest groove is formed inside the side block body. A number of positioning protrusions are arranged around the side armrest groove on the inner side of the side block body. The side block body is provided with side hanging grooves near both ends of one side.

[0010] The positioning protrusions can be inserted into the corresponding stepped positioning grooves, and the positions of the positioning protrusions of the two side armrest blocks are staggered from each other.

[0011] For the outer seam after docking of the middle armrest block and the side armrest block, 0.1mm-level seam control is achieved by using high-frequency vibration welding technology.

[0012] Further, in the above-mentioned automotive interior armrest component, the intermediate armrest groove and the side armrest grooves on both sides together form an armrest holding hole, the middle hanging groove and the side hanging grooves on both sides together form an armrest hanging hole, and the positioning protrusion and the corresponding stepped positioning groove together form a positioning structure that can prevent detachment.

[0013] Further, in the above-mentioned automotive interior armrest component, the positioning protrusion is composed of four protruding units distributed in an annular array. The protruding unit consists of a rod part and an anti-detachment head. When the anti-detachment head of each protruding unit is pressed and fits together when the positioning protrusion is inserted into the narrow end of the stepped positioning groove, and when the anti-detachment head enters the wide end of the stepped positioning groove, the anti-detachment head will return to its original position under the deformation recovery action of the rod part. At this time, the anti-detachment head is restricted in the wide end of the corresponding stepped positioning groove.

[0014] Further, in the above-mentioned automotive interior armrest component, the rod parts of the four protruding units are formed by cutting a cross groove in the middle of a cylindrical structure, and the anti-detachment heads of the four protruding units are formed by cutting a cross groove in the middle of a frustum structure. The wide part of the frustum structure faces downward and is connected to the top end of the cylindrical structure.

[0015] Further, in the above-mentioned automotive interior armrest component, the middle centering block is integrally injection-molded from PA66 material through an injection molding process.

[0016] Further, in the above-mentioned automotive interior armrest component, the side armrest block is integrally injection-molded from PP material through an injection molding process.

[0017] The present invention also provides a flexible welding device for processing the above-mentioned automotive interior armrest member. The flexible welding device includes a frame, a mounting seat, a hydraulic self-clamping mechanism, an outer seam welding mechanism, a pressing push rod, and a suction cup. The upper and lower ends of the frame are open. The left and right side plates of the frame are jointly fixed with a mounting seat. The interior of the mounting seat is provided with a clamping area for conveniently placing an intermediate centering block. The mounting seat is provided with a hydraulic self-clamping mechanism for clamping the intermediate centering block. The outer seam welding mechanisms for outer seam welding are symmetrically installed on both sides of the mounting seat. The pressing push rods are symmetrically installed on the front and rear side plates of the frame. The movable end of the pressing push rod is installed with a suction cup for adsorbing a side centering block.

[0018] Further, in the above flexible welding device, the hydraulic self-clamping mechanism includes a hydraulic oil pump, an oil pipe, a main oil cavity, branch oil cavities, a piston block, a piston rod, and a pressing head. The mounting seat is provided with a main oil cavity that matches the outer seam trend. A number of branch oil cavities are equidistantly communicated with the inner side of the main oil cavity. The piston block is slidably restricted in the branch oil cavity. The outer side of the piston block is connected with an exposed pressing head through a piston rod. The hydraulic oil pump can supply oil or pump oil to the main oil cavity through the oil pipe. A pressure sensor is installed in the oil pipe.

[0019] Further, in the above flexible welding device, the outer seam welding mechanism includes a first slide rail that matches the outer seam trend. A first slider is slidably restricted on the first slide rail. One end of the first slider is installed with a first driving motor. The output end of the first driving motor is installed with a first driving gear. A first tooth groove that meshes with the first driving gear is provided along the trend of the first slide rail. The other end of the first slider is installed with a first ultrasonic welding head.

[0020] Further, in the above flexible welding device, it also includes a split inner seam welding mechanism installed on the left and right side plates of the frame. The split inner seam welding mechanism includes a second slide rail that matches the trend of the corresponding area of the intermediate armrest groove. A second slider is slidably restricted on the second slide rail. One end of the second slider is installed with a second driving motor. The output end of the second driving motor is installed with a second driving gear. A second tooth groove that meshes with the second driving gear is provided along the trend of the second slide rail. The other end of the second slider is installed with a second ultrasonic welding head. The second slide rail is installed at the outer end of the movable rod of a horizontal telescopic push rod. The cylinder body of the horizontal telescopic push rod is fixed on the left side plate or the right side plate of the frame.

[0021] The beneficial effects of the present invention are:

[0022] 1. The automobile interior armrest provided by the present invention is mainly composed of a middle armrest block and side armrest blocks arranged on both sides thereof. The middle armrest block is made of PA66 material, which has excellent strength and rigidity and serves as the main load-bearing part; the side armrest blocks are made of PP material, which has strong chemical resistance, is non-toxic, odorless and tasteless, and provides comfort for holding. The positioning protrusions of the step positioning groove of the middle armrest block together form a positioning structure that can prevent slipping, which is conducive to improving the accuracy of welding and is not prone to cracking after welding.

[0023] 2. The flexible welding equipment provided by the present invention is mainly composed of a frame, a mounting seat, a hydraulic self-clamping mechanism, an outer seam welding mechanism, a pressing push rod and a suction cup. The various components cooperate with each other. The hydraulic self-clamping mechanism in the mounting seat is used to clamp and position the middle handrail block. The pressing push rod is used to drive the side handrail block adsorbed by the suction cup to move toward the middle handrail block, thereby realizing the pre-assembly of the side handrail blocks on both sides and the middle handrail block. The outer seam welding mechanism is then used to weld the outer seam formed by the side handrail blocks on both sides and the middle handrail block, thereby realizing 0.1mm level seam control.

[0024] Of course, any product implementing the present invention does not necessarily need to achieve all of the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the overall structure of the automobile interior armrest of the present invention;

[0027] Figure 2 It is a front view schematic diagram of the entire automobile interior armrest of the present invention;

[0028] Figure 3 It is a schematic diagram of the overall structure of the automobile interior armrest of the present invention;

[0029] Figure 4 It is a schematic diagram of the structure of the middle straightening block in the present invention;

[0030] Figure 5 It is a schematic diagram of the structure of the side handrail block in the present invention;

[0031] Figure 6 It is a structural schematic diagram of the positioning protrusion in the present invention;

[0032] Figure 7 It is a structural schematic diagram of a flexible welding device in Embodiment 2 of the present invention;

[0033] Figure 8 It is a structural schematic diagram of the hydraulic self-clamping mechanism and the outer seam welding mechanism in the present invention;

[0034] Figure 9 It is a schematic structural diagram of the flexible welding device of the present invention before lamination;

[0035] Figure 10 It is a schematic diagram of the structure of the flexible welding device of the present invention after pressing;

[0036] Figure 11 This is a schematic diagram of the structure of the flexible welding device in the third embodiment of the present invention;

[0037] Figure 12 It is a structural schematic diagram of the split inner seam welding mechanism of the present invention;

[0038] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0039] 1-automobile interior armrest, 11-middle straightening block, 111-middle block, 112-middle armrest slot, 113-step positioning slot, 114-middle hanging slot, 12-side armrest block, 121-side block, 122-side armrest slot, 123-positioning protrusion, 123a-rod, 123b-anti-slip head, 124-side hanging slot;

[0040] 2-Framework;

[0041] 3-Mounting seat;

[0042] 4-hydraulic self-clamping mechanism, 401-hydraulic oil pump, 402-oil pipe, 403-main oil chamber, 404-branch oil chamber, 405-piston block, 406-piston rod, 407-pressure head;

[0043] 5-external seam welding mechanism, 501-first slide rail, 502-first slider, 503-first drive motor, 504-first drive gear, 505-first ultrasonic welding head;

[0044] 6- Press the push rod;

[0045] 7- Suction cup;

[0046] 8-split inner seam welding mechanism, 801-second slide rail, 802-second slider, 803-second drive motor, 804-second drive gear, 805-second ultrasonic welding head, 806-horizontally telescopic push rod. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Embodiment 1

[0049] like Figures 1 - 6 As shown, this embodiment provides an automobile interior armrest with a positioning structure. The automobile interior armrest 1 includes a middle armrest block 11 and side armrest blocks 12 arranged on both sides thereof.

[0050] In this embodiment, the middle straightening block 11 includes a middle block body 111, a middle handrail groove 112 is opened inside the middle block body 111, a plurality of step positioning grooves 113 are opened around the middle handrail groove 112, the wide heads of two adjacent step positioning grooves 113 face oppositely, and a middle hanging groove 114 is opened near the two ends of one side of the middle block body 111.

[0051] In this embodiment, the side handrail block 12 includes a side block body 121, a side handrail groove 122 is opened inside the side block body 121, a plurality of positioning protrusions 123 are provided on the inner side of the side block body 121 around the side handrail groove 122, and a side hanging groove 124 is opened near the two ends of one side of the side block body 121.

[0052] In this embodiment, the positioning protrusion 123 can be inserted into the corresponding step positioning groove 113, and the positions of the positioning protrusions 123 of the two side handrail blocks 12 are staggered. The positioning protrusion 123 is composed of four protrusion units distributed in a ring array, and the protrusion unit is composed of a rod 123a and an anti-slip head 123b. When the positioning protrusion is inserted into the narrow head of the step positioning groove 113, the anti-slip heads 123b of each protrusion unit are squeezed and fit together. When the anti-slip head 123b enters the wide head of the step positioning groove 113, the anti-slip head 123b will return to its original position under the deformation recovery action of the rod 123a. At this time, the anti-slip head 123b is confined in the wide head of the corresponding step positioning groove 113.

[0053] In this embodiment, the rods 123a of the four protruding units are formed by cutting a cross groove in the middle of a column structure, and the anti-slip heads 123b of the four protruding units are formed by cutting a cross groove in the middle of a truncated cone structure, and the wide part of the truncated cone structure faces downward and is connected to the top of the column structure. The outer diameter of the column structure matches the narrow part diameter of the step positioning groove 113, the wide part diameter of the truncated cone structure matches the wide part diameter of the step positioning groove 113, and the thickness of the truncated cone structure matches the wide part thickness of the step positioning groove 113.

[0054] In this embodiment, the outer seam 13 after the docking of the middle armrest block 11 and the side armrest block 12 realizes seam control at the 0.1 mm level by using high-frequency vibration welding technology.

[0055] In this embodiment, the middle armrest groove 112 and the side armrest grooves 122 on both sides together form an armrest gripping hole, the middle hanging groove 114 and the side hanging grooves 124 on both sides together form an armrest hanging hole, and the positioning protrusion 123 and the corresponding step positioning groove 113 together form a positioning structure that can prevent detachment.

[0056] In this embodiment, the middle centering block 11 is integrally injection-molded from PA66 material by an injection molding process.

[0057] In this embodiment, the side armrest block 12 is integrally injection-molded from PP material by an injection molding process.

[0058] The specific application of this embodiment is as follows: The automotive interior armrest part 1 provided in this embodiment is mainly composed of a middle armrest block 11 and side armrest blocks 12 arranged on both sides thereof. The middle armrest block 11 is made of PA66 material, which has excellent strength and rigidity and serves as the main load-bearing part; the side armrest block 12 is made of PP material, which has strong chemical resistance and the characteristics of being non-toxic, odorless, and tasteless, providing comfort for gripping. The positioning protrusion 123 of the step positioning groove 113 of the middle armrest block 11 together form a positioning structure that can prevent detachment, which is beneficial to improving the welding accuracy and is not prone to problems such as cracking after welding.

[0059] Embodiment Two

[0060] As Figures 7 - 10 shown, this embodiment provides a flexible welding device for an automotive interior armrest part. The flexible welding device includes a frame 2, a mounting seat 3, a hydraulic self-clamping mechanism 4, an outer seam welding mechanism 5, a pressing push rod 6, and a suction cup 7. The upper and lower ends of the frame 2 are open. The left and right side plates of the frame 2 are jointly fixed with a mounting seat 3. The inside of the mounting seat 3 is provided with a clamping area for conveniently placing the middle centering block 11. The mounting seat 3 is provided with a hydraulic self-clamping mechanism 4 for clamping the middle centering block 11. The outer seam welding mechanisms 5 for welding the outer seam 13 are symmetrically installed on both sides of the mounting seat 3. The pressing push rods 6 are symmetrically installed on the front and rear side plates of the frame 2. The movable ends of the pressing push rods 6 are installed with suction cups 7 for adsorbing the side centering blocks 12.

[0061] In this embodiment, the hydraulic self-clamping mechanism 4 includes a hydraulic oil pump 401, an oil pipe 402, a main oil chamber 403, branch oil chambers 404, a piston block 405, a piston rod 406, and a pressing head 407. A main oil chamber 403 that matches the trend of the outer seam 13 is provided in the mounting base 3. A number of branch oil chambers 404 are equidistantly communicated with the inner side of the main oil chamber 403. A piston block 405 is slidably restricted in the branch oil chambers 404. The outer side of the piston block 405 is connected with an exposed pressing head 407 through a piston rod 406. The hydraulic oil pump 401 can supply oil to or pump oil from the main oil chamber 403 through the oil pipe 402, and a pressure sensor is installed in the oil pipe 402.

[0062] In this embodiment, the outer seam welding mechanism 5 includes a first slide rail 501 that matches the trend of the outer seam 13, and the first slide rail 501 is an integral slide rail. A first slider 502 is slidably restricted on the first slide rail 501. One end of the first slider 502 is installed with a first driving motor 503, and the output end of the first driving motor 503 is installed with a first driving gear 504. A first tooth groove that meshes with the first driving gear 504 is provided along the trend of the first slide rail 501. The other end of the first slider 502 is installed with a first ultrasonic welding head 505.

[0063] The specific application in this embodiment is as follows: This flexible welding device mainly consists of a frame 2, a mounting base 3, a hydraulic self-clamping mechanism 4, an outer seam welding mechanism 5, a pressing push rod 6, and a suction cup 7. Each component cooperates with each other. The hydraulic self-clamping mechanism 4 in the mounting base 3 is used to clamp and position the middle armrest block 11. The pressing push rod 6 drives the side armrest block 12 adsorbed by the suction cup 7 to move towards the middle armrest block 11, realizing the pre-assembly of the two side armrest blocks 12 and the middle armrest block 11. Then, the outer seam welding mechanism 5 is used to weld the outer seam formed by the two side armrest blocks 12 and the middle armrest block 11, realizing a seam control at the 0.1 mm level.

[0064] Embodiment Three

[0065] The structure of this embodiment is basically the same as that of Embodiment Two, and the differences are as Figures 11 - 12 shown. The flexible welding device further includes a split inner seam welding mechanism 8 installed on the left and right side plates of the frame 2.

[0066] In this embodiment, the split-type inner seam welding mechanism 8 includes a second slide rail 801 that is matched with the walking direction of the corresponding area of the middle armrest groove 112. The second slide rail 801 is a split-type slide rail, and the second slide rail is installed at the outer end of the movable rod of the horizontal telescopic push rod 806. The cylinder body of the horizontal telescopic push rod 806 is fixed on the left side plate or the right side plate of the frame. A second slider 802 is slidably restricted on the second slide rail 801. One end of the second slider 802 is installed with a second driving motor 803. The output end of the second driving motor 803 is installed with a second driving gear 804. A second tooth groove meshing with the second driving gear 804 is formed along the walking direction of the second slide rail 801. The other end of the second slider 802 is installed with a second ultrasonic welding head 805.

[0067] The split-type inner seam welding mechanism 8 is used to weld the inner seam after the docking of the middle armrest block 11 and the side armrest block 12, so as to achieve a seam control of 0.1 mm level.

[0068] The preferred embodiments of the present invention disclosed above are only helpful for explaining the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation manners. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. An automotive interior armrest with a positioning structure, characterized in that, The automobile interior armrest comprises a middle armrest block and side armrest blocks arranged on both sides thereof; The middle straightening block comprises a middle block body, a middle handrail groove is provided inside the middle block body, a plurality of step positioning grooves are provided around the middle handrail groove, the wide heads of two adjacent step positioning grooves face oppositely, and a middle hanging groove is provided near both ends of one side of the middle block body; The side handrail block comprises a side block body, a side handrail groove is provided inside the side block body, a plurality of positioning protrusions are provided on the inner side of the side block body around the side handrail groove, and side hanging grooves are provided near both ends of one side of the side block body; The positioning protrusion can be inserted into the corresponding step positioning groove, and the positioning protrusions of the two side handrail blocks are staggered with each other; The outer seam after the middle handrail block and the side handrail block are butt-jointed is controlled to 0.1 mm by high-frequency vibration welding technology.

2. The automotive interior armrest according to claim 1, characterized in that The middle handrail groove and the side handrail grooves on both sides together constitute the handrail holding hole, the middle hanging groove and the side hanging grooves on both sides together constitute the handrail hanging hole, and the positioning protrusion and the corresponding step positioning groove together constitute a positioning structure that can prevent falling off.

3. The automotive interior armrest according to claim 1, characterized in that, The positioning protrusion is composed of four protrusion units distributed in a circular array, and the protrusion unit is composed of a rod and an anti-slip head. When the positioning protrusion is inserted into the narrow head of the step positioning groove, the anti-slip heads of each protrusion unit are squeezed and fit together. When the anti-slip head enters the wide head of the step positioning groove, the anti-slip head will return to its original position under the deformation recovery action of the rod. At this time, the anti-slip head is confined in the wide head of the corresponding step positioning groove.

4. The automotive interior armrest component according to claim 3, characterized in that The rods of the four protruding units are formed by cutting a cross groove in the middle of a column structure, and the anti-slip heads of the four protruding units are formed by cutting a cross groove in the middle of a truncated cone structure. The wide part of the truncated cone structure faces downward and is connected to the top of the column structure.

5. The automotive interior armrest component according to claim 1, characterized in that, The middle straightening block is formed by integrally injection molding of PA66 material through an injection molding process.

6. The automotive interior armrest according to claim 1, characterized in that, The side handrail block is integrally formed by injection molding of PP material through an injection molding process.

7. A flexible welding device for processing an automotive interior armrest member as described in any one of claims 1-6, characterized in that, The flexible welding equipment includes a frame, a mounting seat, a hydraulic self-clamping mechanism, an outer seam welding mechanism, a pressing push rod and a suction cup. The upper and lower ends of the frame are open, and the left and right side plates of the frame are commonly fixed with a mounting seat. The interior of the mounting seat is provided with a clamping area for placing an intermediate straightening block. The mounting seat is provided with a hydraulic self-clamping mechanism for clamping the intermediate straightening block. The outer seam welding mechanisms for outer seam welding are symmetrically installed on both sides of the mounting seat, and the front and rear side plates of the frame are symmetrically installed with pressing push rods, and the movable ends of the pressing push rods are installed with suction cups for adsorbing the side straightening blocks.

8. The flexible welding device according to claim 7, characterized in that, The hydraulic self-clamping mechanism includes a hydraulic oil pump, an oil pipe, a main oil chamber, a branch oil chamber, a piston block, a piston rod and a pressure head. The mounting seat is provided with a main oil chamber that matches the direction of the outer seam. The inner side of the main oil chamber is equidistantly connected to a plurality of branch oil chambers. A piston block is provided in the branch oil chamber for sliding restriction. The outer side of the piston block is connected to an exposed pressure head via a piston rod. The hydraulic oil pump can supply or draw oil to the main oil chamber via the oil pipe. A pressure sensor is installed in the oil pipe.

9. The flexible welding device according to claim 7, characterized in that, The outer seam welding mechanism includes a first slide rail that matches the outer seam direction. A first slider is slidably restricted on the first slide rail. One end of the first slider is equipped with a first driving motor, and the output end of the first driving motor is equipped with a first driving gear. A first tooth groove that meshes with the first driving gear is formed along the direction of the first slide rail. The other end of the first slider is equipped with a first ultrasonic welding head.

10. The flexible welding device according to claim 7, wherein, It further includes a split inner seam welding mechanism installed on the left and right side plates of the frame. The split inner seam welding mechanism includes a second slide rail that matches the direction of the corresponding area of the middle armrest groove. A second slider is slidably restricted on the second slide rail. One end of the second slider is equipped with a second driving motor, and the output end of the second driving motor is equipped with a second driving gear. A second tooth groove that meshes with the second driving gear is formed along the direction of the second slide rail. The other end of the second slider is equipped with a second ultrasonic welding head. The second slide rail is installed at the outer end of the movable rod of a horizontal telescopic push rod, and the cylinder body of the horizontal telescopic push rod is fixed on the left side plate or the right side plate of the frame.

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