Automobile armrest metal support welding device and welding process thereof

Abstract

The application discloses a kind of automobile armrest metal support welding device and welding process thereof, belong to welding equipment technical field, including rack, welding machine host and the electrically conductive rod of fixed connection in the output end of welding machine host;The rack is installed with multi-station support mechanism, and multi-station support mechanism includes support, rotary seat, first rotary drive device and multiple sets of welding tool, and welding tool includes electrically conductive seat, insulating seat and profiling positioning block, and automatic bar changing mechanism is also installed on the rack, by the above-mentioned mode, the area to be protected of ceramic rod around screw arrangement, when spot welding, ceramic rod separates electrically conductive seat and welding slag from screw body, electrode indentation, slag burns thread and mounting surface are prevented, while ceramic is not conductive, will not shunt welding current, guarantee spot welding fusion quality stability, and automatic bar changing mechanism can automatically replace ceramic rod in containing hole, avoid being damaged due to long-term operation and affect the welding quality of screw, ensure the consistency of welded product.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically to a welding device and welding process for a metal bracket of an automobile armrest. Background Technology

[0002] Spot welding is a highly efficient and rapid metal joining process that uses current and pressure to generate heat at the metal contact points, causing them to melt locally and form a weld.

[0003] When spot welding metal parts to screws, the welding electrode directly presses against the outer edge of the screw. The high-temperature electrode can easily damage the screw threads and flange mounting surfaces. Molten weld spatter from welding adheres to the screw surface, causing burns and pitting defects. Existing protection methods mostly use high-temperature resistant plastic sleeves and metal isolation sleeves. However, plastic parts melt rapidly at the welding temperature and fail, while the metal sleeve conducts current, causing insufficient weld penetration and incomplete welds. Both solutions have poor protection effects, short service life, and high workpiece scrap rates.

[0004] Based on this, the present invention designs a welding device and welding process for metal brackets of automobile armrests to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a welding device for metal brackets of automobile armrests and its welding process.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A welding device for metal brackets of car armrests includes a frame, a welding machine host, and a conductive rod fixed to the output end of the welding machine host; The frame is equipped with a multi-station support mechanism, which includes a support, a rotating seat, a first rotary drive device, and multiple sets of welding fixtures. The support is fixed to the upper end of the frame, the rotating seat is rotatably mounted on the upper end of the support through bearings, the first rotary drive device is fixed to the lower end of the support, and the output end of the first rotary drive device is fixed to the rotating seat. Multiple welding fixtures are equidistantly mounted in a circular array on the upper end of the rotating seat. The welding fixture includes a conductive seat, an insulating seat, and a contour positioning block. The conductive seat and the insulating seat are fixed to the upper end of the rotating seat. A contour positioning block is fixed to the upper end of both the conductive seat and the insulating seat. The contour positioning block is adapted to the configuration of the handrail bracket. A material placement hole is opened at the upper end of the conductive seat, and a receiving hole is opened at the lower end of the conductive seat. The material placement hole and the receiving hole are coaxially distributed and connected. The material placement hole is used to accommodate the screw, and the receiving hole is used to accommodate the ceramic rod. The inner wall of the ceramic rod is clearance-fitted with the outer wall of the screw.

[0007] An automatic bar changing mechanism is also installed on the frame, located under the rotary table.

[0008] Furthermore, the automatic bar changing mechanism includes a multi-station hopper assembly, a bar loading and unloading assembly, multiple bar locking assemblies, and a bar unlocking assembly. The multi-station hopper assembly, bar loading and unloading assembly, and bar unlocking assembly are installed on the upper end of the frame. The bar loading and unloading assembly is located on the lower side of the multi-station hopper assembly. The multiple bar locking assemblies are installed on the lower end of the rotating seat and correspond one-to-one with the conductive seat.

[0009] Furthermore, the multi-station hopper assembly includes a fixed base, a second rotary drive device, multiple connecting arms, and multiple limiting cylinders. The fixed base is fixedly connected to the upper end of the frame, and the second rotary drive device is fixedly connected to the lower end of the fixed base. The multiple limiting cylinders are equidistantly distributed in a circumferential array on the upper side of the fixed base, and each limiting cylinder is fixedly connected to the output end of the second rotary drive device through a connecting arm. The limiting cylinders are used to accommodate ceramic rods.

[0010] Furthermore, the fixed base is also provided with a waste discharge groove and a clearance hole, both located on the lower side of the path through which the limiting cylinder passes; the diameter of the clearance hole is smaller than the outer diameter of the ceramic rod.

[0011] Furthermore, the rod loading and unloading assembly includes a double-stroke lifting cylinder, a top block, and an air shaft. The double-stroke lifting cylinder is fixedly connected to the upper end of the frame, the output end of the double-stroke lifting cylinder is fixedly connected to the top block, and the air shaft is fixedly connected to the upper end of the top block.

[0012] Furthermore, the air shaft and the clearance hole are coaxially distributed; a tapered guide structure is provided at the top of the air shaft.

[0013] Furthermore, the rod locking assembly includes a stop block, a spring, a slide rod, a fixing block, and a roller. The fixing block is fixedly connected to the rotating seat, and the stop block is located between the receiving hole and the fixing block. One end of the slide rod is fixedly connected to the stop block, and the other end of the slide rod is slidably connected to the fixing block. The spring is sleeved on the outside of the slide rod, and both ends of the spring abut against the stop block and the fixing block, respectively. The roller is rotatably installed at the lower end of the stop block. A through groove is provided in the stop block to avoid the air shaft and the top block.

[0014] Furthermore, the rod unlocking assembly includes a rotary pressing cylinder and a wedge block. The rotary pressing cylinder is fixed to the side of the fixed base, and the output end of the rotary pressing cylinder is fixed to the wedge block. The wedge block is tumbling connected to the roller.

[0015] To better achieve the objectives of this invention, the present invention also provides a welding process for a metal bracket for an automotive armrest, comprising the following steps: Step 1: Place the handrail bracket onto the conductive base and the insulating base, and position the handrail bracket using the contour positioning block; Step 2: Insert the screw into the connection hole of the handrail bracket, so that the screw passes through the material placement hole of the conductive base and is inserted into the inside of the ceramic rod, so that the ceramic rod is arranged around the area to be protected by the screw. Step 3: The welding machine main unit drives the conductive rod to press down on the screw. The conductive rod and the conductive seat work together to weld the handrail bracket to the screw. The ceramic rod isolates the conductive seat and welding slag from the screw body, preventing electrode indentation and welding slag from burning the threads and mounting surface. At the same time, the ceramic is non-conductive and will not divert the welding current. Step 4: After the ceramic rod has been in operation for the preset time, replace the ceramic rod in the receiving hole.

[0016] Furthermore, step four specifically includes the following steps: Step S1: The double-stroke lifting cylinder drives the top block to move upward through the clearance hole, so that the air shaft is inserted into the inner side of the ceramic rod in the receiving hole of the conductive seat. The air shaft contacts the bottom of the ceramic rod and the air shaft tightens and fixes the ceramic rod. Step S2: Rotate the downward pressing cylinder to drive the wedge block to rotate and then translate, so that the wedge block pushes the roller, and the stop block moves away from the lower end of the receiving hole and closer to the fixed block under the limiting action of the slide rod; Step S3: The double-stroke lifting cylinder drives the ceramic rod to move down into the limiting cylinder, the air shaft releases the ceramic rod, and the double-stroke lifting cylinder then drives the air shaft to move down and retract into the clearance hole. Step S4: The second rotary drive device controls the rotation of the limiting cylinder through the connecting arm, so that the new ceramic rod moves to the upper side of the clearance hole; Step S5: The new ceramic rod is fed into the receiving hole by the cooperation of the double-stroke lifting cylinder, the top block and the air shaft. The rotating pressing cylinder drives the wedge block to reset, and the spring drives the stop block to reset and block the ceramic rod, so as to realize the fixing and replacement of the ceramic rod.

[0017] Compared with the prior art, the beneficial effects of this invention are as follows: 1. The conductive seat, insulating seat, and contour positioning block work together to position the handrail bracket, and then the screw is inserted into the connecting hole of the handrail bracket, so that the screw passes through the material placement hole of the conductive seat and is inserted into the inner side of the ceramic rod, thereby making the ceramic rod surround the area to be protected of the screw. During spot welding, the ceramic rod isolates the conductive seat and welding slag from the screw body, preventing electrode indentation, welding slag burning the threads and mounting surface. At the same time, the ceramic is non-conductive and will not divert the welding current, ensuring stable spot welding quality. The first rotary drive device drives the rotary seat to rotate, driving different welding fixtures to align with the conductive rod, so that this device can simultaneously load the handrail bracket and screw and unload the welded product, realizing uninterrupted welding of the workpiece and meeting the high-efficiency welding needs of a large number of workpieces. 2. Different ceramic rods of different sizes can be replaced in the receiving hole (545) to adapt to various workpieces such as cylindrical screws and hexagonal flange screws. One set of tooling can be compatible with spot welding processes of multiple products, reducing the investment in tooling production. The automatic rod changing mechanism can automatically replace the ceramic rods in the receiving hole, avoiding damage to the ceramic rods due to long-term operation and affecting the welding quality of the screws, thus ensuring the consistency of the welded products. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 This is a perspective view of a welding device for a metal bracket of an automobile armrest according to the present invention; Figure 2 This is a front view of a metal bracket welding device for an automobile armrest according to the present invention; Figure 3 This is a partial three-dimensional representation of a welding device for a metal bracket of an automobile armrest according to the present invention. Figure 1 ; Figure 4 This is a partial three-dimensional representation of a welding device for a metal bracket of an automobile armrest according to the present invention. Figure 2 ; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a three-dimensional structural view of the automatic bar-changing mechanism of the present invention; Figure 7 This is a three-dimensional structural view of the welding fixture of the present invention; Figure 8 This is a side half-sectional perspective view of the welding fixture of the present invention.

[0020] The labels in the diagram represent: 1. Frame; 2. Welding machine main unit; 3. Conductive rod; 4. Ceramic rod; 5. Multi-station support mechanism; 51. Support; 52. Rotary seat; 53. First rotary drive device; 54. Welding fixture; 541. Conductive seat; 542. Insulating seat; 543. Contouring positioning block; 544. Material feeding hole; 545. Receiving hole; 6. Automatic rod changing mechanism; 61. Multi-station hopper assembly; 611. Fixed seat; 612. Second rotary drive device; 613. 614. Connecting arm; 615. Limiting cylinder; 616. Waste discharge trough; 617. Clearance hole; 62. Rod loading and unloading assembly; 621. Double-stroke lifting cylinder; 622. Top block; 623. Air shaft; 63. Rod locking assembly; 631. Stop block; 632. Spring; 633. Slide rod; 634. Fixing block; 635. Roller; 64. Rod unlocking assembly; 641. Rotary pressing cylinder; 642. Wedge block; 7. Handrail bracket; 8. Screw. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0023] In some embodiments, please refer to the accompanying drawings. Figures 1-8 A welding device for metal brackets of car armrests includes a frame 1, a welding machine host 2, and a conductive rod 3 fixed to the output end of the welding machine host 2. The frame 1 is equipped with a multi-station support mechanism 5, which includes a support 51, a rotating seat 52, a first rotary drive device 53, and multiple sets of welding fixtures 54. The support 51 is fixed to the upper end of the frame 1, the rotating seat 52 is rotatably mounted on the upper end of the support 51 through bearings, the first rotary drive device 53 is fixed to the lower end of the support 51, and the output end of the first rotary drive device 53 is fixed to the rotating seat 52; multiple welding fixtures 54 are equidistantly mounted in a circular array on the upper end of the rotating seat 52. The welding fixture 54 includes a conductive seat 541, an insulating seat 542, and a contour positioning block 543. The conductive seat 541 and the insulating seat 542 are fixedly connected to the upper end of the rotating seat 52. The contour positioning block 543 is fixedly connected to the upper end of both the conductive seat 541 and the insulating seat 542. The contour positioning block 543 is adapted to the configuration of the handrail bracket 7. The upper end of the conductive seat 541 is provided with a material placement hole 544, and the lower end of the conductive seat 541 is provided with a receiving hole 545. The material placement hole 544 and the receiving hole 545 are coaxially distributed and connected. The material placement hole 544 is used to receive the screw 8, and the receiving hole 545 is used to receive the ceramic rod 4. The inner wall of the ceramic rod 4 is clearance-fitted with the outer wall of the screw 8.

[0024] An automatic bar changing mechanism 6 is also installed on the frame 1. The automatic bar changing mechanism 6 is located under the rotating seat 52.

[0025] In this invention, the conductive seat 541, the insulating seat 542, and the contour positioning block 543 work together to position the handrail bracket 7. Then, the screw 8 is inserted into the connecting hole of the handrail bracket 7, so that the screw 8 passes through the material placement hole 544 of the conductive seat 541 and is inserted into the inner side of the ceramic rod 4. Thus, the ceramic rod 4 is arranged around the area to be protected of the screw 8. During spot welding, the ceramic rod 4 isolates the conductive seat 541 and the welding slag from the main body of the screw 8, preventing electrode indentation, welding slag burning of the threads and mounting surface. At the same time, the ceramic is non-conductive and will not divert the welding current, ensuring stable spot welding quality. The first rotary drive device 53 drives the rotary seat 52 to rotate, driving different welding fixtures 54 to align with the conductive rod 3. This allows the device to simultaneously load the handrail bracket 7 and the screw 8 and unload the welded product, realizing uninterrupted welding of the workpiece and meeting the high-efficiency welding requirements of a large number of workpieces. Meanwhile, ceramic rods 4 of different sizes can be replaced in the receiving hole 545 to adapt to various workpieces such as cylindrical screws and hexagonal flange screws. One set of tooling can be compatible with spot welding processes of multiple products, reducing the investment in tooling manufacturing. The automatic rod changing mechanism 6 can automatically replace the ceramic rods 4 in the receiving hole 545, avoiding damage to the ceramic rods 4 due to long-term operation and affecting the welding quality of the screws 8, thus ensuring the consistency of the welded products.

[0026] The automatic bar changing mechanism 6 includes a multi-station hopper assembly 61, a bar loading and unloading assembly 62, multiple bar locking assemblies 63 and a bar unlocking assembly 64. The multi-station hopper assembly 61, the bar loading and unloading assembly 62 and the bar unlocking assembly 64 are installed on the upper end of the frame 1. The bar loading and unloading assembly 62 is located on the lower side of the multi-station hopper assembly 61. The multiple bar locking assemblies 63 are installed on the lower end of the rotating seat 52 and correspond one-to-one with the conductive seat 541. In this invention, through the coordinated operation of the multi-station hopper assembly 61, the rod loading and unloading assembly 62, the rod locking assembly 63, and the rod unlocking assembly 64, the ceramic rods 4 in all welding fixtures 54 can be automatically updated, ensuring that the ceramic rods 4 always have a protective effect on the screws 8, thereby improving the yield of finished parts.

[0027] The multi-station hopper assembly 61 includes a fixed base 611, a second rotary drive device 612, multiple connecting arms 613, and multiple limiting cylinders 614. The fixed base 611 is fixedly connected to the upper end of the frame 1, and the second rotary drive device 612 is fixedly connected to the lower end of the fixed base 611. The multiple limiting cylinders 614 are equidistantly distributed in a circular array on the upper side of the fixed base 611. Each limiting cylinder 614 is fixedly connected to the output end of the second rotary drive device 612 through a connecting arm 613. The limiting cylinders 614 are used to accommodate ceramic rods 4. The fixed base 611 is also provided with a waste discharge groove 615 and a clearance hole 616, which are located below the path through which the limiting cylinders 614 pass. The diameter of the clearance hole 616 is smaller than the outer diameter of the ceramic rod 4.

[0028] The rod loading and unloading assembly 62 includes a double-stroke lifting cylinder 621, a top block 622, and an air shaft 623. The double-stroke lifting cylinder 621 is fixedly connected to the upper end of the frame 1, and its output end is fixedly connected to the top block 622. The air shaft 623 is fixedly connected to the upper end of the top block 622, and is coaxially distributed with the clearance hole 616. A tapered guide structure is provided at the top of the air shaft 623.

[0029] The rod locking assembly 63 includes a stop block 631, a spring 632, a slide rod 633, a fixing block 634, and a roller 635. The fixing block 634 is fixedly connected to the rotating seat 52, and the stop block 631 is located between the receiving hole 545 and the fixing block 634. One end of the slide rod 633 is fixedly connected to the stop block 631, and the other end of the slide rod 633 is slidably connected to the fixing block 634. The spring 632 is sleeved on the outside of the slide rod 633, and both ends of the spring 632 abut against the stop block 631 and the fixing block 634, respectively. The roller 635 is rotatably mounted on the lower end of the stop block 631. In this embodiment, the stop block 631 has a through groove for avoiding the air shaft 623 and the top block 622.

[0030] The rod unlocking assembly 64 includes a rotary pressing cylinder 641 and a wedge block 642. The rotary pressing cylinder 641 is fixedly connected to the side of the fixed base 611. The output end of the rotary pressing cylinder 641 is fixedly connected to the wedge block 642. The wedge block 642 is rotatably connected to the roller 635. In this invention, after the ceramic rod 4 is placed inside the limiting cylinder 614, the lower end of the limiting cylinder 614 slides on the fixed seat 611. The second rotary drive device 612 controls the rotation of the limiting cylinder 614 through the connecting arm 613. When the ceramic rod 4 moves to the upper side of the clearance hole 616, the rotary pressing cylinder 641 drives the wedge block 642 to rotate and then translate, so that the wedge block 642 pushes the roller 635, and the stop block 631 moves away from the lower end of the receiving hole 545 and closer to the fixed block 634 under the limiting action of the slide rod 633. The spring 632 is compressed. At this time, the double-stroke lifting cylinder 621 drives the top block 622 to move upward, so that the air shaft 623 is inserted into the inner side of the ceramic rod 4 inside the limiting cylinder 614. The top block 622 contacts the bottom of the ceramic rod 4, and then the air shaft 623 is tightened. The ceramic rod 4 is fixed in place. The double-stroke lifting cylinder 621 lifts the top block 622 again, pushing the ceramic rod 4 into the receiving hole 545, realizing the automatic installation of the ceramic rod 4. At this time, the rotating pressing cylinder 641 drives the wedge block 642 to reset and disengage from the roller 635. The spring 632 drives the stop block 631 to reset and block the ceramic rod 4, thus fixing the ceramic rod 4. Finally, the air shaft 623 retracts, and the double-stroke lifting cylinder 621 drives the air shaft 623 to reset, so that the limiting cylinder 614 on the fixed seat 611 can drive the ceramic rod 4 to rotate smoothly. The scrap ceramic rod 4 in the receiving hole 545 can also be unloaded into the empty limiting cylinder 614 through the above operation, and with the rotation of the limiting cylinder 614, the scrap ceramic rod 4 in the limiting cylinder 614 is automatically discharged through the waste discharge groove 615.

[0031] In this embodiment, the lower end of the rotating seat 52 and the outer side of the fixed seat 611 are both covered with protective shells to prevent welding slag from splashing onto the components.

[0032] In some embodiments, the first rotary drive device 53 and the second rotary drive device 612 are servo motor driven cam dividers.

[0033] In some embodiments, such as Figures 1-8 As shown, in a preferred embodiment of the present invention, a welding process for a metal bracket for a car armrest includes the following steps: Step 1: Place the handrail bracket 7 onto the conductive base 541 and the insulating base 542, and position the handrail bracket 7 using the contour positioning block 543; Step 2: Insert screw 8 into the connecting hole of handrail bracket 7, so that screw 8 passes through the material placement hole 544 of conductive seat 541 and is inserted into the inner side of ceramic rod 4, so that ceramic rod 4 is arranged around the area to be protected by screw 8. Step 3: The welding machine host 2 drives the conductive rod 3 to press down on the screw 8. The conductive rod 3 and the conductive seat 541 cooperate to weld the handrail bracket 7 and the screw 8. The ceramic rod 4 isolates the conductive seat 541 and the welding slag from the main body of the screw 8, preventing electrode indentation, welding slag burning the threads and mounting surface. At the same time, ceramic is non-conductive and will not divert the welding current. Step 4: After the ceramic rod 4 has been in operation for the preset time, replace the ceramic rod 4 in the receiving hole 545.

[0034] Step four specifically includes the following steps: Step S1: The double-stroke lifting cylinder 621 drives the top block 622 to move upward through the clearance hole 616, so that the air shaft 623 is inserted into the inner side of the ceramic rod 4 in the receiving hole 545 of the conductive seat 541. The air shaft 623 contacts the bottom of the ceramic rod 4 and the air shaft 623 tightens and fixes the ceramic rod 4. Step S2: Rotate the downward pressing cylinder 641 to drive the wedge block 642 to rotate and then translate, so that the wedge block 642 pushes the roller 635, and the stop block 631 moves away from the lower end of the receiving hole 545 and closer to the fixed block 634 under the limiting action of the slide rod 633. Step S3: The double-stroke lifting cylinder 621 drives the ceramic rod 4 to move down into the limiting cylinder 614, the air shaft 623 releases the ceramic rod 4, and the double-stroke lifting cylinder 621 then drives the air shaft 623 to move down and retract into the clearance hole 616. Step S4: The second rotary drive device 612 controls the rotation of the limiting cylinder 614 through the connecting arm 613, so that the new ceramic rod 4 moves to the upper side of the clearance hole 616. Step S5: The new ceramic rod 4 is fed into the receiving hole 545 by the cooperation of the double-stroke lifting cylinder 621, the top block 622 and the air shaft 623. The rotating pressing cylinder 641 drives the wedge block 642 to reset, and the spring 632 drives the stop block 631 to reset and block the ceramic rod 4, thereby realizing the fixing and replacement of the ceramic rod 4.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding device for metal brackets of automobile armrests, comprising a frame (1), a welding machine host (2), and a conductive rod (3) fixed to the output end of the welding machine host (2), characterized in that: The frame (1) is equipped with a multi-station support mechanism (5). The multi-station support mechanism (5) includes a support (51), a rotating seat (52), a first rotary drive device (53), and multiple sets of welding fixtures (54). The support (51) is fixed to the upper end of the frame (1). The rotating seat (52) is rotatably mounted on the upper end of the support (51) through a bearing. The first rotary drive device (53) is fixed to the lower end of the support (51). The output end of the first rotary drive device (53) is fixed to the rotating seat (52). Multiple welding fixtures (54) are equidistantly mounted in a circular array on the upper end of the rotating seat (52). The welding fixture (54) includes a conductive seat (541), an insulating seat (542), and a contour positioning block (543). The conductive seat (541) and the insulating seat (542) are fixedly connected to the upper end of the rotating seat (52). The upper end of both the conductive seat (541) and the insulating seat (542) is fixedly connected to the contour positioning block (543). The contour positioning block (543) is adapted to the configuration of the handrail bracket (7). The upper end of the conductive seat (541) is provided with a material placement hole (544), and the lower end of the conductive seat (541) is provided with a receiving hole (545). The material placement hole (544) and the receiving hole (545) are coaxially distributed and connected. The material placement hole (544) is used to receive the screw (8), and the receiving hole (545) is used to receive the ceramic rod (4). The inner wall of the ceramic rod (4) is clearance-fitted with the outer wall of the screw (8). An automatic bar changing mechanism (6) is also installed on the frame (1), and the automatic bar changing mechanism (6) is located on the underside of the rotating seat (52).

2. The welding device for the metal bracket of the automobile armrest according to claim 1, characterized in that, The automatic bar changing mechanism (6) includes a multi-station hopper assembly (61), a bar loading and unloading assembly (62), multiple bar locking assemblies (63) and a bar unlocking assembly (64). The multi-station hopper assembly (61), the bar loading and unloading assembly (62) and the bar unlocking assembly (64) are installed on the upper end of the frame (1). The bar loading and unloading assembly (62) is located on the lower side of the multi-station hopper assembly (61). The multiple bar locking assemblies (63) are installed on the lower end of the rotating seat (52) and correspond one-to-one with the conductive seat (541).

3. The welding device for the metal bracket of the car armrest according to claim 2, characterized in that, The multi-station hopper assembly (61) includes a fixed base (611), a second rotary drive device (612), multiple connecting arms (613), and multiple limiting cylinders (614). The fixed base (611) is fixed to the upper end of the frame (1), and the second rotary drive device (612) is fixed to the lower end of the fixed base (611). The multiple limiting cylinders (614) are arranged in a circumferential array and are equidistantly distributed on the upper side of the fixed base (611). Each limiting cylinder (614) is fixed to the output end of the second rotary drive device (612) through the connecting arm (613). The limiting cylinders (614) are used to accommodate ceramic rods (4).

4. The welding device for the metal bracket of the automobile armrest according to claim 3, characterized in that, The fixed base (611) is also provided with a waste discharge groove (615) and a clearance hole (616), which are located on the lower side of the path through which the limiting cylinder (614) passes; the diameter of the clearance hole (616) is smaller than the outer diameter of the ceramic rod (4).

5. The welding device for the metal bracket of the automobile armrest according to claim 4, characterized in that, The rod loading and unloading assembly (62) includes a double-stroke lifting cylinder (621), a top block (622), and an air shaft (623). The double-stroke lifting cylinder (621) is fixedly connected to the upper end of the frame (1), and the output end of the double-stroke lifting cylinder (621) is fixedly connected to the top block (622). The air shaft (623) is fixedly connected to the upper end of the top block (622).

6. The welding device for the metal bracket of a car armrest according to claim 5, characterized in that, The air shaft (623) and the clearance hole (616) are coaxially distributed; a tapered guide structure is provided at the top of the air shaft (623).

7. The welding device for the metal bracket of a car armrest according to claim 6, characterized in that, The rod locking assembly (63) includes a stop block (631), a spring (632), a slide rod (633), a fixing block (634), and a roller (635). The fixing block (634) is fixedly connected to the rotating seat (52), and the stop block (631) is located between the receiving hole (545) and the fixing block (634). One end of the slide rod (633) is fixedly connected to the stop block (631), and the other end of the slide rod (633) is slidably connected to the fixing block (634). The spring (632) is sleeved on the outside of the slide rod (633), and both ends of the spring (632) abut against the stop block (631) and the fixing block (634) respectively. The roller (635) is rotatably installed at the lower end of the stop block (631). A through groove is provided in the stop block (631) to avoid the air shaft (623) and the top block (622).

8. The welding device for the metal bracket of a car armrest according to claim 7, characterized in that, The rod unlocking assembly (64) includes a rotary pressing cylinder (641) and a wedge block (642). The rotary pressing cylinder (641) is fixed to the side of the fixed base (611). The output end of the rotary pressing cylinder (641) is fixed to the wedge block (642). The wedge block (642) is tumbling connected to the roller (635).

9. A welding process for a metal bracket of a car armrest, utilizing the metal bracket welding device for a car armrest as described in claim 8, characterized in that, Includes the following steps: Step 1: Place the handrail bracket (7) on the conductive base (541) and the insulating base (542), and position the handrail bracket (7) using the contour positioning block (543); Step 2: Insert the screw (8) into the connection hole of the handrail bracket (7), so that the screw (8) passes through the material placement hole (544) of the conductive seat (541) and is inserted into the inner side of the ceramic rod (4), so that the ceramic rod (4) is arranged around the area to be protected by the screw (8). Step 3: The welding machine host (2) drives the conductive rod (3) to press down on the screw (8). The conductive rod (3) and the conductive seat (541) work together to weld the handrail bracket (7) and the screw (8). The ceramic rod (4) isolates the conductive seat (541) and the welding slag from the main body of the screw (8), preventing electrode indentation, welding slag burning the threads and mounting surface. At the same time, ceramic is non-conductive and will not divert the welding current. Step 4: After the ceramic rod (4) has been in operation for a preset time, replace the ceramic rod (4) in the receiving hole (545).

10. The welding process of the automotive armrest metal bracket according to claim 9, characterized in that, Step four specifically includes the following steps: Step S1: The double-stroke lifting cylinder (621) drives the top block (622) to move upward through the clearance hole (616), so that the air shaft (623) is inserted into the inner side of the ceramic rod (4) in the receiving hole (545) of the conductive seat (541). The air shaft (623) contacts the bottom of the ceramic rod (4), and the air shaft (623) tightens and fixes the ceramic rod (4). Step S2: Rotate the downward pressing cylinder (641) to drive the wedge block (642) to rotate and then translate, so that the wedge block (642) pushes the roller (635) and the stop block (631) moves away from the lower end of the receiving hole (545) and closer to the fixed block (634) under the limiting action of the slide rod (633); Step S3: The double-stroke lifting cylinder (621) drives the ceramic rod (4) to move down into the limiting cylinder (614), the air shaft (623) releases the ceramic rod (4), and the double-stroke lifting cylinder (621) then drives the air shaft (623) to move down and retract into the clearance hole (616); Step S4: The second rotary drive device (612) controls the rotation of the limiting cylinder (614) through the connecting arm (613), so that the new ceramic rod (4) moves to the upper side of the clearance hole (616); Step S5: The new ceramic rod (4) is sent into the receiving hole (545) by the cooperation of the double-stroke lifting cylinder (621), the top block (622) and the air shaft (623). The rotating pressing cylinder (641) drives the wedge block (642) to reset, and the spring (632) drives the stop block (631) to reset and block the ceramic rod (4), thereby realizing the fixing and replacement of the ceramic rod (4).

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