Automatic door accessory spot welding system and process thereof

Abstract

The invention relates to the field of accessory spot welding, in particular to an automatic door accessory spot welding system and a process thereof.The automatic door accessory spot welding system comprises a machine shell upper shell fixedly connected with a support and a lower shell fixedly connected with the bottom of the machine shell upper shell, a welding pen is arranged in the machine shell upper shell, a containing groove is formed in the top of the lower shell, and a first rotating column is rotationally connected to the top of the lower shell; a moving assembly is arranged at the bottom of the first rotating column, a transmission rod penetrates through and is fixedly connected to the bottom of the moving assembly, a first roller is arranged at the end, away from the moving assembly, of the transmission rod, and the end of the transmission rod is in radial sliding connection with an inner cavity of the first roller along the central axis; and a horizontal strip fixedly connected with the end of the transmission rod is horizontally and slidably connected into the horizontal groove, the second roller is driven by the first roller to rotate, so that the second rotating column and the fourth rotating column are matched with each other, and the plate clamping effect is achieved.

Description

Technical Field

[0001] The invention relates to the field of accessory spot welding, and in particular to an automatic door accessory spot welding system and a process thereof. Background Art

[0002] Spot welding is a welding method that uses a cylindrical electrode to create a weld point between the contact surfaces of two overlapping workpieces. During spot welding, pressure is first applied to bring the workpieces into close contact. Then, an electric current is applied. Resistance heat melts the workpieces at contact, and upon cooling, a weld point is formed. Spot welding is primarily used for welding thin sheet metal stampings with a thickness of less than 4 mm.

[0003] In the process of welding the automatic door frame plate, the existing technology is to use an automatic spot welding machine to weld. The worker will fit the two plates tightly together, and then indirectly step on the bottom switch to manually adjust the welding position. However, manual spot welding adjustment has the following problems: one is that the spot welding position is not uniform enough, which may lead to insufficient welding position; the other is that the worker needs to manually adjust the position next to the equipment, which is not accurate enough and may even cause unnecessary injuries. Therefore, we need to invent a spot welding system that does not require manual adjustment of the position, automatically performs welding, and can adapt to different sizes of automatic door accessories. The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the Invention

[0004] The purpose of the present invention is to design a spot welding system that can automatically perform welding without manual position adjustment and can adapt to automatic door accessories of different sizes, so as to solve the above-mentioned shortcomings in the technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a spot welding system for automatic door accessories, comprising an upper shell of a casing fixedly connected to a bracket, and a lower shell fixedly connected to the bottom of the upper shell of the casing, a welding pen is provided inside the upper shell of the casing, a placement slot is opened on the top of the lower shell, a first rotating column is rotatably connected to the top of the lower shell, a moving component is provided at the bottom of the first rotating column, the bottom of the moving component passes through and is fixedly connected to a transmission rod, and a transmission component is provided at one end of the transmission rod away from the moving component, a hydraulic rod is installed on one side of the lower shell, and a thrust rod is fixedly connected to the end of the hydraulic rod output shaft, one end of the thrust rod is inserted into the inner cavity of the transmission component, a second roller is provided on the outer shell, one end of the second roller is rotatably connected to the outer shell, a moving block is provided on the top of the second roller, the moving block is threadedly connected to the transmission assembly and the second roller, and the top of the moving block is rotatably connected to the second rotating column, the transmission rod pushes the transmission assembly to fit with the second roller bayonet, and the transmission assembly will drive the second roller to rotate, thereby driving the second rotating column at its top to move its position, thereby achieving the clamping effect of the workpiece.

[0006] Preferably, the transmission assembly includes a first roller slidably connected to the transmission rod, the end of the transmission rod is radially slidably connected to the inner cavity of the first roller along the central axis, the inner cavity of the first roller is provided with a horizontal groove, and a horizontal bar fixedly connected to the end of the transmission rod is horizontally slidably connected inside the horizontal groove, the top of the lower shell is provided with a sliding groove, and a third rotating column is slidably installed inside the sliding groove, and a first spring is provided between the sliding groove near one end of the first roller and the third rotating column, a second spring that contacts the transmission rod is installed in the inner cavity of the first roller, and a transmission belt is connected to the outside of the first rotating column, the second rotating column and the third rotating column for rolling together, and a fourth rotating column is installed on the top of the lower shell to cooperate with the second rotating column.

[0007] Preferably, one end of the transmission rod extending into the inner cavity of the first roller is fixedly connected to an O-shaped groove, the bottom of the O-shaped groove is fixedly connected to the second spring, the outer wall of the O-shaped groove is fixedly connected to the horizontal bar, and the horizontal bar is horizontally slidably connected to the horizontal groove, so that it is slidably connected in the inner cavity of the first roller.

[0008] Preferably, the motion component includes a first bevel gear fixedly connected to the bottom of the first rotating column, the first bevel gear is engaged and rotated with a second bevel gear, the outer wall of the rotating rod is fixedly connected to a connecting tube, and the outer wall of the connecting tube is fixedly connected to the inner wall of the second bevel gear.

[0009] Preferably, a protective shell is fixedly connected to the bottom of the lower shell, a first motor is passed through and fixedly connected to one side of the protective shell, the first motor is fixedly connected to the transmission rod, an end of the protective shell away from the first motor is passed through and rotatably connected to a rotating shaft, the rotating shaft is fixedly connected to the second roller, the hydraulic rod is fixedly connected to the outer wall of the protective shell, and the output end of the hydraulic rod passes through the rotating shaft and extends into the inner cavity of the second roller.

[0010] Preferably, a trigger button is provided at one end of the moving block away from the first rotating column, and the trigger button is electrically connected to the hydraulic rod.

[0011] Preferably, the inner cavity of the second roller is divided into two sections, one side is connected to the transmission rod, and the inner cavity of the other end is connected to the thrust rod. The end of the thrust rod away from the hydraulic rod is rotatably connected to an extrusion block, and the material of the extrusion block is rubber.

[0012] Preferably, a first diamond-shaped groove is provided at the end of the connecting tube away from the first motor, a first diamond-shaped protrusion is fixedly connected to the end of the first roller close to the connecting tube, a second diamond-shaped groove is provided at the end of the first roller away from the connecting tube, and a second diamond-shaped protrusion is fixedly connected to the end of the second roller close to the first roller, the first diamond-shaped groove and the first diamond-shaped protrusion fit together, and the second diamond-shaped groove and the second diamond-shaped protrusion fit together.

[0013] Preferably, the connecting plate fixedly connected to the top of the soldering pen has symmetrical rollers fixedly connected on both sides of the connecting plate, a positioning plate is slidably connected between the roller and the connecting plate, the positioning plate is fixedly connected to the inner wall of the upper shell of the casing, the bottom of the roller is rotatably connected to a cam, and the two cams are fixedly connected to a first connecting runner in opposite directions, the end of the first connecting runner away from the cam is fixedly connected to a first connecting rod, the end of the first connecting rod away from the first connecting runner passes through and is rotatably connected to the outer wall of the upper shell of the casing, the casing is located on one side of the first connecting rod and is rotatably connected to a second connecting rod, the end of the second connecting rod away from the upper shell of the casing is fixedly connected to two second connecting runners symmetrically distributed in the middle of the second connecting rod, a welding rod is placed between the two symmetrical second connecting runners, the welding rod is wound on the second connecting runner, and the end of the welding rod away from the second connecting runner is placed under the welding head position of the soldering pen, a second motor is installed on the end of the first connecting rod passing through the upper shell of the casing, and the output end of the second motor is fixedly connected to the first connecting rod, and a third motor is installed on the end of the second connecting rod passing through the upper shell of the casing, and the output end of the third motor is fixedly connected to the second connecting rod.

[0014] Preferably, a guide groove is provided at the top of the lower shell of the casing at the position of the welding pen and the welding rod, and the guide groove runs through the bottom of the upper shell of the casing.

[0015] In a second aspect, the present invention further provides a method for using a spot welding system, which is used to operate the automatic door accessory spot welding system and its process for testing. The method comprises the steps of: S1: Align the aluminum strip to be welded with the U-shaped plate and extend it into the guide groove; S2: Start the first motor, which drives the second rotating column to clamp the aluminum bar and the U-shaped plate through the cooperation of the fourth rotating column; S3: After the second rotating column and the fourth rotating column clamp the plate, the plate squeezes the trigger button on the moving block, activating the hydraulic rod to push the second roller away from the third roller, so that it no longer clamps. The first rotating column drives the second rotating column to rotate through the conveyor belt, thereby driving the plate to move; S4: Start the second motor, which drives the cam to rotate, thereby pushing the welding pen to move up and down at a constant speed, so that it can weld the plate; S5: Start the third motor, which drives the welding rod to be transported to the bottom of the welding pen, thereby achieving a spot welding effect.

[0016] In the above technical solution, the technical effects and advantages provided by the present invention are: The present invention places the aluminum plate and the U-shaped plate to be welded into an introduction groove, starts the first motor, and the motor drives the first roller and the second roller in contact with the first roller to rotate so that the second rotating column moves away from the first rotating column. Through the mutual cooperation of the fourth rotating column, a clamping force is applied to the U-shaped plate, thereby achieving the effect of preventing the welding position from shifting when welding the aluminum plate and the U-shaped plate. The present invention reaches the most secure position during the process of clamping the aluminum U-shaped plate. The U-shaped plate will squeeze the trigger button, and the trigger button will activate the hydraulic rod to move the first roller away from the second roller. Therefore, the moving block no longer drives the second rotating column to stop moving and clamping, and drives the aluminum bar and the U-shaped plate to move horizontally through transmission rotation. Since the trigger button is opened by squeezing the plate, it is not necessarily suitable for a specific size, but can be used for different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 This is the overall appearance diagram of the present invention; Figure 2 Schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the bottom clamping position of the present invention; Figure 4 A top view of the bottom clamping position of the present invention; Figure 5 This is a schematic diagram of the connection of the bottom device of the present invention; Figure 6 A cross-sectional view of the bottom device connection of the present invention; Figure 7 This is a diagram of the welding function motion structure of the present invention; Figure 8 For the present invention Figure 6 Magnified image in .

[0019] Description of reference numerals: 1. Upper housing; 2. Lower housing; 3. Soldering pen; 4. Mounting slot; 5. First rotating column; A. Motion assembly; 6. Transmission rod; 7. First roller; 8. Horizontal slot; 9. Horizontal bar; 10. Hydraulic rod; 11. Thrust rod; 12. Second roller; 13. Moving block; 14. Second rotating column; 15. Sliding slot; 16. Third rotating column; 17. First spring; 18. Second spring; 19. Transmission belt; 20. Fourth rotating column; 21. O-shaped slot; A1. First bevel gear; A2. Second bevel gear ;A3, connecting tube; 22, protective shell; 23, first motor; 24, rotating shaft; 25, trigger button; 26, extrusion block; 27, first diamond groove; 28, first diamond protrusion; 29, second diamond groove; 30, second diamond protrusion; 31, connecting plate; 32, roller; 33, positioning plate; 34, cam; 35, first connecting wheel; 36, first connecting rod; 37, second connecting rod; 38, second connecting wheel; 39, welding rod; 40, second motor; 41, third motor; 42, guide groove. DETAILED DESCRIPTION

[0020] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0021] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0022] The present invention provides Figure 1-8The automatic door accessories spot welding system shown in the figure includes an upper casing 1 fixedly connected to a bracket, and a lower casing 2 fixedly connected to the bottom of the upper casing 1. A welding pen 3 is provided inside the upper casing 1, and a placement slot 4 is provided on the top of the lower casing 2. The top of the lower casing 2 is rotatably connected to a first rotating column 5. When the equipment needs to work, the second diamond groove 29 of the first roller 7 is first fitted with the second diamond protrusion 30 of the second roller 12 through the thrust of the second spring 18, thereby driving the second roller 12 to rotate synchronously. The rotation of the first roller 7 and the second roller 12 drives the moving fast threaded connection at the top thereof to slide horizontally, thereby driving the second rotating column 14 away from the first rotating column 5, performing a clamping effect on the plate to be welded. We have installed a trigger button 25 on the moving block 13 at the bottom of the second rotating column 14. When the first rotating column 5 is passed The required welding plate is clamped by the mutual cooperation of the fourth rotating column 20. When the clamping is tightest, the plate will squeeze the trigger button 25, and the trigger button 25 will start the hydraulic rod 10. The output end of the hydraulic rod 10 will extend into the inner cavity of the first roller 7 and push the first roller 7, so that the first roller 7 is away from the second roller 12. The motion component A will not be able to drive the second roller 12 to rotate, so the moving block 13 no longer drives the second rotating column 14 to stop moving and clamping, and drives the aluminum bar and the U-shaped plate to move horizontally through the transmission rotation. At this time, the transmission belt 19 that rolls together outside the first rotating column 5, the second rotating column 14 and the third rotating column 16, through the cooperation of the fourth rotating column 20, drives the plate to slide horizontally in the guide groove. The first motor 23 that drives the second rotating column 14 to move horizontally is a servo motor, and the speed is slow during the startup process; After the clamping and transmission work is completed, the second rotating column 14 will return to the original path and approach the first rotating column 5. At this time, the conveyor belt wrapped around its outside will become relatively loose, which will easily affect the operation of the equipment in the long run. Therefore, we have installed a third rotating column 16 at the bottom of the casing. The third rotating column 16 uses the first spring 17 at the bottom to stretch the transmission belt 19, reducing the tightness of the crawler belt during operation; When the plate to be welded is placed in the guide groove 42, the first connecting rod 36 is driven to rotate by the second motor 40, so that the cam 34 is rotated, and the cam 34 drives the roller 32 to move up and down, so that the welding pen 3 is limited by the positioning plate 33 and performs a uniform vertical lifting and lowering motion. The second connecting rod 37 is driven to rotate by the third motor 41, so that the welding rod 39 is slowly extended and located at the bottom of the welding pen 3, thereby welding the plate. Since the welding rod 39 is wrapped around the middle of the second connecting rod 37, at the beginning of the work, the end of the welding rod 39 away from the first connecting rod 36 is aligned with the welding point of the welding pen 3. Since the welding rod 39 extends more when it rotates more, we need to set the speed of the third motor 41 from slow to fast, so as to ensure that the distribution of spot welding is closer to the average distance. The operation process is now described as a whole: the aluminum bar to be welded and the U-shaped clip are placed under the soldering pen 3 inside the equipment through the introduction slot, and then the first motor 23 is started. The first motor 23 is a servo motor. Since the transmission rod 6 is extended into the inner cavity of the first roller 7 and a second spring 18 is provided at one end, the first roller 7 and the second roller 12 are stuck together through the second diamond groove 29 and the second diamond protrusion 30 under the thrust of the spring, so that the first motor 23 can drive the second roller 12 to rotate, thereby driving the second rotating column 14 connected with the top thread to rotate horizontally. Move away from the first rotating column 5 and approach the fourth rotating column 20, so as to clamp the plate to be welded. When the plate is clamped, the trigger button 25 on the moving block 13 that is in contact with the plate will be squeezed and opened, thereby starting the hydraulic rod 10 at the bottom. The thrust rod 11 fixedly connected to the output end of the hydraulic rod 10 extends toward the inner cavity of the first roller 7 and pushes the first roller 7 away from the second roller 12. At this time, the second roller 12 no longer receives the rotational force of the first motor 23, so it stops rotating. The rotation of the first rotating column 5 drives the second rotating column 14 to rotate. The conveyor belt wrapped around its outside also rotates synchronously, thereby driving the plate to move horizontally in the guide groove 42, and then starting the second motor 40, the second motor 40 drives the first connecting rod 36 to rotate, and the first connecting rod 36 drives the cam 34 to rotate, then the rotation of the cam 34 drives the roller 32 on its top and performs reciprocating vertical motion, and the roller 32 then drives the soldering pen 3 connected thereto to perform reciprocating vertical motion, thereby achieving an indirect welding effect of the soldering pen 3 on the plate, and then starting the third motor 41, the third motor 41 drives the second The connecting rod 37 rotates to transport the welding rod 39 wound in the second connecting rod 37 behind the welding pen 3, thereby achieving the welding effect. When the welding work is completed, the trigger button 25 rebounds, and the hydraulic rod 10 stops powering and no longer pushes the first roller 7. On the contrary, the thrust of the second spring 18 pushes the first roller 7 to fit with the second roller 12, and the motor reverses to drive the second rotating column 14 close to the first rotating column 5. At this time, the elastic force of the first spring 17 pushes the third rotating column 16 to stretch the conveyor belt so that it will not become loose and fall off, and finally the recovery work is completed.

[0023] In conjunction with an automatic door accessory spot welding system and process, the present invention also provides a method for using the spot welding system, which is used to operate the automatic door accessory spot welding system and process for testing. The method includes the following steps: S1: Place the aluminum bar and U-shaped clip to be welded under the welding pen 3 inside the equipment through the guide slot; S2: By starting the first motor 23, which is a servo motor, and because the second spring 18 is provided at one end of the transmission rod 6 extending into the inner cavity of the first roller 7, the first roller 7 and the second roller 12 are engaged and clamped through the second diamond groove 29 and the second diamond protrusion 30 under the thrust of the spring, so that the first motor 23 can drive the second roller 12 to rotate, thereby driving the second rotating column 14 with a threaded connection on the top to move horizontally away from the first rotating column 5 and approach the fourth rotating column 20, thereby clamping the plate to be welded; S3: When the sheet is clamped, the trigger button 25 on the moving block 13 that is in contact with the sheet will be squeezed and opened, thereby starting the hydraulic rod 10 at the bottom. The thrust rod 11 fixedly connected to the output end of the hydraulic rod 10 extends toward the inner cavity of the first roller 7 and pushes the first roller 7 away from the second roller 12. At this time, the second roller 12 no longer receives the rotational force of the first motor 23 and therefore stops rotating. The rotation of the first rotating column 5 drives the second rotating column 14 to rotate, causing the conveyor belt wrapped around it to rotate synchronously, thereby driving the sheet to move horizontally in the guide groove 42. S4: Start the second motor 40, which drives the first connecting rod 36 to rotate. The first connecting rod 36 drives the cam 34 to rotate. The rotation of the cam 34 drives the roller 32 on its top to perform reciprocating vertical motion. The roller 32 then drives the soldering pen 3 connected thereto to perform reciprocating vertical motion, thereby achieving an indirect welding effect of the soldering pen 3 on the plate. S5: Start the third motor 41, which drives the second connecting rod 37 to rotate, and transports the welding rod 39 wound in the second connecting rod 37 behind the welding pen 3, thereby achieving a welding effect.

[0024] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are illustrative only. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should readily understand that many modifications are possible without materially departing from the novel teachings and advantages of the subject matter described in this application (e.g., changes in the size, scale, structure, shape and proportion of various components and parameter values (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.).

Claims

1. A spot welding system for automatic door accessories, comprising an upper housing fixedly connected to a bracket, and a lower housing fixedly connected to the bottom of the upper housing, wherein a welding pen is provided inside the upper housing, and characterized in that: The top of the lower shell is provided with a mounting groove, and the top of the lower shell is rotatably connected to the first rotating column, and a moving component is provided at the bottom of the moving component, and a transmission rod is passed through and fixedly connected to the bottom of the moving component. A transmission component is provided at one end of the transmission rod away from the moving component. A hydraulic rod is installed on one side of the lower shell, and the end of the hydraulic rod output shaft is fixedly connected to a thrust rod, and one end of the thrust rod is inserted into the inner cavity of the transmission component. A second roller is covered with a thrust rod, and one end of the second roller is rotatably connected to the outer shell. A moving block is provided on the top of the second roller, and the moving block is threadedly connected to the transmission assembly and the second roller. The top of the moving block is rotatably connected to the second rotating column, and the transmission rod pushes the transmission assembly to fit the second roller bayonet. The transmission assembly will drive the second roller to rotate, thereby driving the second rotating column on its top to move its position, so as to achieve the clamping effect of the workpiece.

2. The automatic door accessories spot welding system and process according to claim 1, characterized in that: The transmission assembly includes a first roller slidably connected to the transmission rod, and the end of the transmission rod is radially slidably connected to the inner cavity of the first roller along the central axis. The inner cavity of the first roller is provided with a horizontal groove, and a horizontal bar fixedly connected to the end of the transmission rod is horizontally slidably connected inside the horizontal groove. The top of the lower shell is provided with a sliding groove, and a third rotating column is slidably installed inside the sliding groove. A first spring is provided between the sliding groove near one end of the first roller and the third rotating column, and a second spring that contacts the transmission rod is installed in the inner cavity of the first roller. The first rotating column, the second rotating column and the third rotating column are jointly connected with a transmission belt in a rolling manner. The top of the lower shell is provided with a fourth rotating column that cooperates with the second rotating column.

3. The automatic door accessories spot welding system and process according to claim 1, characterized in that: One end of the transmission rod extending into the inner cavity of the first roller is fixedly connected to an O-shaped groove, the bottom of the O-shaped groove is fixedly connected to the second spring, the outer wall of the O-shaped groove is fixedly connected to the horizontal bar, and the horizontal bar is horizontally slidably connected to the horizontal groove, so that it is slidably connected to the inner cavity of the first roller.

4. The automatic door accessories spot welding system according to claim 1, characterized in that: The motion component includes a first bevel gear fixedly connected to the bottom of the first rotating column, the first bevel gear is engaged and rotated with a second bevel gear, the outer wall of the rotating rod is fixedly connected to a connecting cylinder, and the outer wall of the connecting cylinder is fixedly connected to the inner wall of the second bevel gear.

5. The automatic door accessories spot welding system according to claim 1, characterized in that: A protective shell is fixedly connected to the bottom of the lower shell, a first motor is passed through and fixedly connected to one side of the protective shell, the first motor is fixedly connected to the transmission rod, a rotating shaft is passed through and rotatably connected to the end of the protective shell away from the first motor, the rotating shaft is fixedly connected to the second roller, the hydraulic rod is fixedly connected to the outer wall of the protective shell, and the output end of the hydraulic rod passes through the rotating shaft and extends into the inner cavity of the second roller.

6. The automatic door accessories spot welding system according to claim 1, characterized in that: A trigger button is provided at one end of the moving block away from the first rotating column, and the trigger button is electrically connected to the hydraulic rod.

7. The automatic door accessories spot welding system and process according to claim 1, characterized in that: The inner cavity of the second roller is divided into two sections, one side is connected to the transmission rod, and the inner cavity of the other end is connected to the thrust rod. The end of the thrust rod away from the hydraulic rod is rotatably connected to the extrusion block, and the material of the extrusion block is rubber.

8. The automatic door accessories spot welding system according to claim 1, characterized in that: A first diamond-shaped groove is formed at the end of the connecting tube away from the first motor, a first diamond-shaped protrusion is fixedly connected to the end of the first roller close to the connecting tube, a second diamond-shaped groove is formed at the end of the first roller away from the connecting tube, and a second diamond-shaped protrusion is fixedly connected to the end of the second roller close to the first roller. The first diamond-shaped groove and the first diamond-shaped protrusion fit together, and the second diamond-shaped groove and the second diamond-shaped protrusion fit together.

9. The automatic door accessories spot welding system according to claim 1, characterized in that: The connecting plate is fixedly connected to the top of the soldering pen, and symmetrical rollers are fixedly connected on both sides of the connecting plate. A positioning plate is slidably connected between the roller and the connecting plate, and the positioning plate is fixedly connected to the inner wall of the upper shell of the casing. A cam is rotatably connected to the bottom of the roller, and the two cams are fixedly connected to the first connecting roller in opposite directions. The end of the first connecting roller away from the cam is fixedly connected to the first connecting rod, and the end of the first connecting rod away from the first connecting roller passes through and is rotatably connected to the outer wall of the upper shell of the casing. The casing is located on one side of the first connecting rod and is rotatably connected to the second connecting rod. The end of the second connecting rod away from the upper shell of the casing is fixedly connected to two second connecting rollers symmetrically distributed in the middle of the second connecting rod. A welding rod is placed between the two symmetrical second connecting rollers, and the welding rod is wound on the second connecting roller. The end of the welding rod away from the second connecting roller is placed under the welding head position of the soldering pen. A second motor is installed on the end of the first connecting rod passing through the upper shell of the casing, and the output end of the second motor is fixedly connected to the first connecting rod. A third motor is installed on the end of the second connecting rod passing through the upper shell of the casing, and the output end of the third motor is fixedly connected to the second connecting rod.

10. The automatic door accessories spot welding system according to claim 1, characterized in that: A guide groove is provided on the top of the lower shell of the casing at the position of the welding pen and the welding rod, and the guide groove passes through the bottom of the upper shell of the casing.

11. A method for using a spot welding system, for operating an automatic door accessory spot welding system as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S: Align the aluminum strip to be welded with the U-shaped plate and extend it into the guide groove; S: Start the first motor, which drives the second rotating column to clamp the aluminum bar and the U-shaped plate through the cooperation of the fourth rotating column; S: After the second and fourth rotating columns clamp the plate, the plate squeezes the trigger button on the moving block, activating the hydraulic rod to push the second roller away from the third roller, so that it no longer clamps. The first rotating column drives the second rotating column to rotate through the conveyor belt, thereby driving the plate to move; S: Start the second motor, which drives the cam to rotate, thereby pushing the welding pen to move up and down at a uniform speed, so that it can weld the plate; S: Start the third motor, which drives the welding rod to the bottom of the welding pen, thereby achieving spot welding effect.

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