Flexible direct capacitor lead welding system

Abstract

A flexible straight capacitor lead welding system belongs to the technical field of capacitor lead welding, and comprises a material pushing arm which is horizontally arranged, a clamping groove is formed in the front end edge of the material pushing arm, and the material pushing arm is movably arranged in the front-back direction; the material pipe is vertically arranged below the material pushing arm; the pressing plate is vertically arranged at the front end of the material pushing arm, is movably arranged along the length direction, and is positioned on the outer side of the material pipe along the upper pressing plate at the front end of the material pushing arm; the two wire cutters are arranged on the two sides of the moving track of the material pushing arm respectively. The two welding guns are arranged on the two sides of the moving track of the material pushing arm respectively and located between the material pipe and the wire cutting pliers on the same side, the two welding guns are movably arranged in the connecting line direction, and wire bunching holes are formed in the two sides of the operation portion of each welding gun and used for allowing a lead of a capacitor to penetrate through. And the operating parts of the wire cutting pliers and the welding gun and the midpoint of the clamping groove in the height direction are positioned in the same horizontal range. According to the scheme, the production efficiency is high, the reserved length of the leads can be adjusted, and the orientation of the leads at the two ends of the capacitor and the welding spot position are accurately controlled.

Description

Technical Field

[0001] The present invention belongs to the technical field of capacitor lead welding, and particularly relates to a flexible DC capacitor lead welding system. Background Art

[0002] Flexible DC capacitors usually have a cylindrical structure, and leads need to be welded at both ends before assembly. The existing welding process is mainly completed manually. The operator first cuts the leads of a specified length according to requirements, and then uses an electric soldering iron or a welding torch to weld and fix the leads at both ends of the capacitor. This method not only requires cutting the leads, but also needs to manually flip the capacitor to complete the lead welding work at both ends. The welding efficiency is relatively low. Moreover, when welding manually, the positions of the lead solder joints are relatively random, resulting in different orientations of the leads drawn out, which has a certain impact on the product quality. Summary of the Invention

[0003] To solve the deficiencies of the existing technology, the present invention provides a flexible DC capacitor lead welding system, which can realize automatic feeding, welding, cutting, and discharging, and can adjust the reserved length of the leads, and can control the orientations of the leads at both ends of the capacitor and the positions of the solder joints.

[0004] To achieve the purpose of the present invention, the following scheme is proposed: A flexible DC capacitor lead welding system includes: A pushing arm, which is horizontally arranged, and a card slot is vertically opened at the front end thereof in the horizontal direction. The pushing arm is horizontally movable in the front-rear direction; A material pipe, which is vertically arranged below the pushing arm and is used to provide capacitors in a horizontal state to the card slot; A pressing plate, which is vertically arranged at the front end of the pushing arm and is movable along the length direction of the pushing arm. The pressing plate is located outside the material pipe along the orientation of the front end of the pushing arm; Two tangent pliers, which are respectively arranged on both sides of the moving track of the pushing arm and are on the same side of the material pipe as the pressing plate; Two welding torches, which are respectively arranged on both sides of the moving track of the pushing arm and are located between the material pipe and the tangent pliers on the same side. The two welding torches are movable along the connection line direction. Wire bundling holes are arranged on both sides of the working part of the welding torch for threading the leads of the capacitor; the working parts of the tangent pliers and the welding torches are in the same horizontal range as the midpoint in the height direction of the card slot.

[0005] The beneficial effects of the present invention are as follows: This solution not only realizes the automatic feeding, welding, lead cutting, and discharging of capacitors, with high production efficiency; but also can automatically convey the leads, and by controlling the moving distance of the pushing arm after welding, the length of the leads reserved on the capacitor is determined. This not only reduces the personnel configuration for specially cutting the leads, but also makes the lengths of the leads at both ends of the capacitor after welding more consistent, and can ensure that the solder joints and the lead orientations are the same, which helps to improve the lead welding quality and consistency. Brief Description of the Drawings

[0006] The drawings described herein are only for illustrating selected embodiments and not all possible implementation schemes, let alone intended to limit the scope of the present invention.

[0007] Figure 1 The schematic diagram of the overall structure of a preferred solution of the present application is shown.

[0008] Figure 2 Shows Figure 1 The enlarged partial view at position A in

[0009] Figure 3 The cross-sectional view of the present application when the material pipe pushes the capacitor upward is shown.

[0010] Figure 4 The cross-sectional view of the present application during the material taking process is shown.

[0011] Figure 5 The cross-sectional view of the present application when the pressing plate clamps the capacitor with the card slot is shown.

[0012] Figure 6 Shows Figure 5 The enlarged partial view at position B in

[0013] Figure 7 The state view of the preferred solution of the present application when the pressing plate pushes the control rod downward is shown.

[0014] Figure 8 The partial cross-sectional view of the preferred solution of the present application when the pressing plate pushes the control rod downward is shown.

[0015] Figure 9 The cross-sectional view of the preferred solution of the present application when the pressing plate contacts the front inclined surface is shown.

[0016] Figure 10 The state view of the preferred solution of the present application when unloading the capacitor is shown.

[0017] Figure 11 The partial cross-sectional view of the preferred solution of the present application when unloading the capacitor is shown.

[0018] Figure 12 The partial cross-sectional view of the preferred solution of the present application after unloading the capacitor is shown.

[0019] Markings in the figure: Pushing arm - 1, Card slot - 101, Guide rail - 11, Base - 12, Gear - 13, Motor - 14, Mounting plate - 15, Material pipe - 2, Limit slot - 201, Feeding slot - 21, Lifting plate - 22, Lifting cylinder - 23, Spring piece - 24, Pressure plate - 3, Pull rod - 31, Front rod - 311, Rear rod - 312, Stop block - 32, Return spring - 33, Rib - 34, Tangent pliers - 4, Welding torch - 5, Cable hole - 51, Control rod - 6, Rear inclined plane - 601, Front inclined plane - 602, Support spring - 61, Sliding block - 62, Discharge slot - 63, Lead wire - 91. Detailed implementation mode

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following describes the implementation modes of the present invention in detail with reference to the accompanying drawings. However, the embodiments described herein are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0021] As Figures 1 to 3 shown, a flexible DC capacitor lead welding system includes: a pushing arm 1, a material pipe 2, a pressure plate 3, tangent pliers 4 and a welding torch 5.

[0022] Specifically, as Figure 1 shown, the pushing arm 1 is horizontally arranged, and a card slot 101 with a V-shaped or U-shaped cross-section is vertically opened at its front end in the horizontal direction, where vertical means that the extending direction of the card slot 101 is perpendicular to the connecting line direction of the front and rear ends of the pushing arm 1, and the pushing arm 1 is horizontally movable in the front-rear direction.

[0023] Specifically, as Figure 1 , Figure 3 shown, the material pipe 2 is vertically arranged below the pushing arm 1 and is used to provide capacitors in a horizontal state to the card slot 101.

[0024] Specifically, as Figure 1 shown, the pressure plate 3 is vertically arranged at the front end of the pushing arm 1 and is movable along the length direction of the pushing arm 1. Specifically, a telescopic cylinder or a hydraulic cylinder can be arranged on the top surface of the pushing arm 1 to control the movement of the pressure plate 3. Along the upward direction of the front end of the pushing arm 1, the pressure plate 3 is located outside the material pipe 2.

[0025] Specifically, in combination with Figure 1 , Figure 2 shown, there are two tangent pliers 4, which are respectively arranged on both sides of the movement track of the pushing arm 1 and are on the same side of the material pipe 2 as the pressure plate 3. The tangent pliers 4 can adopt a conventional double-blade scissors structure, and a telescopic cylinder or a telescopic motor is used to control the opening and closing of the two blades, so as to achieve the purpose of shearing.

[0026] Specifically, in combination with Figure 1 , Figure 2As shown, there are two welding torches 5, which are respectively arranged on both sides of the moving track of the pusher arm 1 and are located between the material pipe 2 and the tangent pliers 4 on the same side. The two welding torches 5 are arranged to move along the connection line direction. Both sides of the working part of the welding torch 5 are provided with wire bundling holes 51 for threading the lead wires 91 of the capacitor; the midpoints of the working parts of the tangent pliers 4 and the welding torch 5 in the height direction are within the same horizontal range; in a specific implementation, according to the welding requirements, different types of welding torches 5 can be selected. The conventional welding of capacitors is soldering, so the welding torch 5 can be selected as a soldering torch, and it is a soldering torch with automatic wire feeding. Its structure can refer to a soldering gun disclosed in the patent with the application number CN201910152837.0.

[0027] The welding principle is as follows: As Figure 2 shown, before the capacitor welding operation, first pass the front end of the lead wire 91 through the two wire bundling holes 51. At this time, the working part of the welding torch 5 is exactly between the two wire bundling holes 51.

[0028] The first step: material taking. As Figure 3 shown, move the pusher arm 1 backward and make the pressure plate 3 and the clamping groove 101 be on both sides above the material pipe 2 respectively. Convey a horizontally placed capacitor upward through the material pipe 2 so that the capacitor is between the clamping groove 101 and the pressure plate 3; as Figure 4 、 Figure 5 shown, move the pusher arm 1 forward, use the clamping groove 101 to push the capacitor towards the pressure plate 3, or simultaneously move the pressure plate 3 towards the pusher arm 1 to clamp and fix the capacitor by using the pressure plate 3 and the clamping groove 101.

[0029] The second step: welding. Continue to move the pusher arm 1 forward, move the capacitor between the two welding torches 5 and stop; make the two welding torches 5 move towards the two end faces of the capacitor at the same time, and then weld and fix the front end of the lead wire 91 on the end face of the capacitor. After welding, move the welding torch 5 outward.

[0030] The third step: cutting. Continue to move the pusher arm 1 forward, drive the two lead wires 91 to move forward a predetermined distance by using the capacitor to determine the reserved length of the lead wire 91 on the capacitor, and then use the two tangent pliers 4 to cut the corresponding lead wires 91. After the lead wires 91 are cut, the front ends of the remaining lead wires 91 are still threaded in the two wire bundling holes 51 for the next welding.

[0031] The fourth step: unloading. Move the pressure plate 3 forward towards the front of the pusher arm 1 to release the welded capacitor. The capacitor automatically falls under the action of gravity to achieve the purpose of automatic material discharge; after unloading, move the pusher arm 1 backward again to make the pusher arm 1 and the pressure plate 3 be in the state at the time of material taking, and then the next welding cycle can be carried out.

[0032] The above solution not only realizes automatic feeding and discharging of capacitors, but also can automatically convey the lead 91. By controlling the moving distance of the pusher arm 1 after welding, the length of the lead 91 remaining on the capacitor is determined. This not only reduces the staffing for specifically cutting the lead 91, but also makes the lengths of the leads 91 at both ends of the capacitor more consistent after welding, and can ensure that the solder joints and the orientations of the leads 91 are the same, which helps to improve the welding quality and consistency of the leads 91.

[0033] Preferably, as Figure 1 shown, a guide rail 11 parallel to its length direction is provided on each side of the pusher arm 1. The guide rail 11 slidably penetrates through a base 12. A rack is embedded in the middle section in the height direction on the outside of one of the guide rails 11. The rack can also be directly formed by machining the guide rail 11. The rack meshes with a gear 13. The gear 13 is coaxially arranged on the main shaft of a motor 14. By driving the gear 13 to rotate through the motor 14, the rack and the pusher arm 1 are driven to reciprocate in the length direction. As a preferred structure, the pusher arm 1 is made of a rectangular tube to reduce its weight.

[0034] Preferably, as Figures 3 to 5 shown, a feeding groove 21 is provided on one side at the lower end of the material tube 2 for conveying capacitors to the lower end of the material tube 2. A lifting plate 22 is arranged in the material tube 2, and its lifting is controlled by a lifting cylinder 23 arranged at the bottom of the material tube 2. On the inner walls of the opposite sides of the material tube 2 at the same height, a spring piece 24 inclined upward is provided for supporting the capacitors above. During operation, the lifting cylinder 23 is used to drive the lifting plate 22 to rise, thereby pushing the capacitors inside the material tube 2 upward. When the capacitor moves upward beyond the spring piece 24, the spring piece 24 is pressed against the side wall of the material tube 2 to avoid the capacitor. When the capacitor passes beyond the spring piece 24, it is supported on the spring piece 24. Then, the lifting plate 22 is lowered to make the capacitors in the feeding groove 21 roll above the lifting plate 22, and then the capacitors can be continuously conveyed upward. As a preferred structure, the feeding groove 21 is designed to be an inclined structure to facilitate the automatic rolling of the capacitors inside it into the material tube 2.

[0035] Preferably, as shown in combination with Figure 1 、 Figures 3 to 5 shown, a pressing plate 3 is vertically arranged at the front end of a pull rod 31. The pull rod 31 passes through an installation plate 15 arranged on the top surface of the pusher arm 1 in parallel. A stop block 32 is arranged at the rear end of the pull rod 31. A return spring 33 is sleeved on the part of the pull rod 31 corresponding to the position between the stop block 32 and the installation plate 15. When the pressure plate 3 is in contact with the front end of the pushing arm 1, the return spring 33 is in a compressed state; the bottom edge of the pressure plate 3 is lower than the top surface of the material pipe 2. In this way, during the process of the pushing arm 1 moving backward to the outside of the top discharge port of the material pipe 2, the outer wall of the material pipe 2 can be used to resist the pressure plate 3. When the pressure plate 3 moves backward together with the pushing arm 1, the distance between the pressure plate 3 and the card slot 101 increases, thus creating a space for the capacitor to enter. When the capacitor is pushed up to between the card slot 101 and the pressure plate 3, move the pushing arm 1 forward, so that the card slot 101 pushes the capacitor box pressure plate 3 to move. During this process, under the action of the elastic force of the return spring 33, the pressure plate 3 always clings to the outer wall of the material pipe 2 until the pressure plate 3 presses tightly on the capacitor, and then continue to move the pushing arm 1 forward, which can drive the capacitor to move together.

[0036] A vertical control rod 6 is provided on the outside of the tangent pliers 4 corresponding to the orientation of the front end of the pushing arm 1, and it is arranged to move in the vertical direction. Specifically, when it rises, the height of its top surface is higher than the bottom surface of the pressure plate 3, and when it descends, the height of its top surface is lower than the bottom surface of the pressure plate 3. The control rod 6 is mainly used to open the pressure plate 3 that presses the capacitor. The specific principle is as follows: after the lead 91 of the capacitor is welded and cut off, the pushing arm 1 will be used to move the pressure plate 3 to the outside of the control rod 6. During the process, the control rod 6 needs to be lowered to a height lower than the bottom surface of the pressure plate 3 so that the pressure plate 3 can smoothly cross the control rod 6, and then raise the control rod 6 so that the height of its top surface is higher than the bottom surface of the pressure plate 3; then move the pushing arm 1 backward. During this process, the control rod 6 will block the backward movement of the pressure plate 3, so that the distance between the card slot 101 and the pressure plate 3 gradually increases. When the distance between the lower edge of the card slot 101 and the pressure plate 3 is greater than the diameter of the capacitor, the capacitor will automatically fall, and the unloading operation is completed. After the unloading is completed, lower the control rod 6, and the pressure plate 3 can automatically move toward the pushing arm 1 under the action of the return spring 33; specifically, the lifting and lowering of the control rod 6 can be controlled by a vertically arranged air cylinder.

[0037] Preferably, as Figures 3 to 5 shown, the pull rod 31 includes a front rod 311 and a rear rod 312 that are rotatably connected at one end. The axis of rotation is in a horizontal state and perpendicular to the pushing arm 1. The pressure plate 3 is arranged at the front end of the front rod 311, and the stop block 32 is arranged at the rear end of the rear rod 312. Both the front rod 311 and the rear rod 312 can pass through the mounting plate 15 and the return spring 33.

[0038] When the pressure plate 3 presses the capacitor tightly, the front rod 311 passes through the mounting plate 15; when the front rod 311 is located outside the mounting plate 15, the distance between the pushing arm 1 and the pressure plate 3 is greater than the outer diameter of the capacitor to be welded.

[0039] The bottom of the control rod 6 is disposed at the top end of a support spring 61. The horizontal height of the lower end of the support spring 61 remains fixed. When the support spring 61 is in a natural state, the top surface of the control rod 6 is higher than the bottom surface of the pressing plate 3. The side of the upper end of the control rod 6 facing the pushing arm 1 is a rear inclined surface 601, and the angle between it and the horizontal plane is less than or equal to 60 degrees. The side of the upper end of the control rod 6 opposite to the rear inclined surface 601 has a front inclined surface 602, and the angle between it and the vertical plane is less than or equal to 5 degrees and greater than 1 degree.

[0040] Adopting the above design scheme can not only make the pressing plate 3 automatically compress the capacitor, but also only need to move the pushing arm 1 to make the pressing plate 3 automatically release the capacitor after welding, reducing the use of automatic components and making the software control logic of the device simpler.

[0041] The specific working principle is as follows: When taking the material, as shown in Figure 3 and Figure 5 , using the outer wall of the material tube 2 to resist the pressing plate 3, under the action of the elastic force of the return spring 33, at this time the rear rod 312 and the front rod 311 are in the same straight line. Then, by moving the pushing arm 1 forward, the clamping groove 101 and the pressing plate 3 jointly press the capacitor tightly. At this time, the front rod 311 passes through the mounting plate 15, so the front rod 311 cannot swing upward around the connecting part with the rear rod 312, so as to ensure the stability of clamping the capacitor. As shown in Figure 7 and Figure 8 , after cutting the lead 91, the pushing arm 1 drives the pressing plate 3 to move towards the control rod 6. The lower edge of the outer side of the pressing plate 3 will push the control rod 6 to move downward by sliding contact with the rear inclined surface 601, and compress the support spring 61. The purpose of setting the angle between the rear inclined surface 601 and the horizontal plane to be less than or equal to 60 degrees is to make the control rod 6 easier to descend under the push of the pressing plate 3. As shown in Figure 9 , when the control rod 6 descends below the bottom surface of the pressing plate 3, the pressing plate 3 will smoothly cross the control rod 6. Under the action of the support spring 61, the control rod 6 will automatically rise, and the front inclined surface 602 will contact the lower edge of the inner side of the pressing plate 3, and stop moving the pushing arm 1 forward. As shown in Figure 10 and Figure 11 , then move the pushing arm 1 backward. Since the pressing plate 3 is blocked by the front inclined surface 602, and the angle between the front inclined surface 602 and the vertical plane is less than or equal to 5 degrees and greater than 1 degree, the downward component force exerted by the pressing plate 3 on the front inclined surface 602 is difficult to push the control rod 6 to descend compared with the component force exerted on the rear inclined surface 601. So the position of the pressing plate 3 is temporarily fixed. As the pushing arm 1 moves backward, the return spring 33 will be compressed, and the distance between the pressing plate 3 and the front end of the pushing arm 1 will gradually increase. When the distance increases to be suitable for the outer diameter of the capacitor, the motor will automatically drop; as shown in Figure 12As shown, then continue to move the pusher arm 1 backward so that the front rod 311 moves out of the mounting plate 15. At this time, the rotating connection part between the front rod 311 and the rear rod 312 is also exposed outside the mounting plate 15. Then continue to move the pusher arm 1, and the pressing plate 3 will slide upward along the front inclined surface 602. At this time, the front rod 311 will swing upward around the connection part with the rear rod 312 until the pressing plate 3 separates from the front inclined surface 602. Then, under the action of the elastic force of the return spring 33, the pull rod 31 will be pulled to move backward to the rear end of the pusher arm 1, and the front rod 311 will pass through the mounting plate 15 again. The user can select the elastic force of the return spring 33 according to the weight of the welded capacitor. Different weights require different pressing forces, so different elastic forces of the return spring 33 are selected; the elastic force of the support spring 61 only needs to satisfy that when the front rod 311 separates from the mounting plate 15, it will not move downward under the action of the component force generated by the pressing plate 3 on the front inclined surface 602. During specific implementation, it can be verified and selected through multiple tests.

[0042] Preferably, a T-shaped groove is formed along the length direction on the top surface of the pusher arm 1, and a T-shaped block is provided at the bottom of the stopper 32. The T-shaped block is slidably arranged in the T-shaped groove to ensure the stability of the overall installation position of the rear rod 312 and the pull rod 31.

[0043] Preferably, as Figure 1 、 Figure 3 and Figures 7 to 12 shown, the control rod 6 is vertically arranged through a sliding block 62. A support plate is provided at the bottom of the sliding block 62. The support spring 61 is arranged on the top surface of the support plate. The position of the sliding block 62 along the length direction of the pusher arm 1 is adjustable, so as to adjust the working position of the control rod 6 according to the change of the shearing length of the lead 91, and make the control rod 6 closer to the position where the pressing plate 3 is located when shearing the lead 91, so as to shorten the moving stroke of the pusher arm 1 during the unloading process; specifically, a screw or a linear motor can be used to control the movement of the sliding block 62.

[0044] Preferably, as Figure 3 、 Figure 8 and Figure 9 shown, a discharge groove 63 is provided on one side of the sliding block 62 facing the material pipe 2 for receiving the unloaded capacitors. This structure can make the discharge groove 63 move along the length direction of the pusher arm 1 following the control rod 6 to adapt to the change of the unloading position.

[0045] Preferably, in combination with Figure 3 、 Figure 6 and Figure 8As shown, a horizontally arranged rib 34 is provided at the lower end of the pressing plate 3 on the side facing the material pipe 2, and a limiting groove 201 matching the rib 34 is formed in the outer wall of the material pipe 2 on the side facing the pressing plate 3. When the pressing plate 3 contacts the material pipe 2, the rib 34 is clamped in the limiting groove 201. At this time, even if the front rod 311 is separated from the mounting plate 15, the upward swing of the front rod 311 can be prevented, which may affect the increase in the distance between the pressing plate 3 and the clamping groove 101, so as to achieve the purpose of smoothly taking materials.

[0046] The above are only the preferred embodiments of the present invention and do not represent the only or limit the present invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from the scope of the present invention all fall within the scope of protection of the present invention.

Claims

1. A flexible DC capacitor lead welding system, characterized in that, Including: A pusher arm (1), which is horizontally arranged, and a clamping groove (101) is vertically opened at the front end thereof along the horizontal direction. The pusher arm (1) is horizontally movable in the front-rear direction; A material pipe (2), which is vertically arranged below the pusher arm (1) and is used to provide a horizontally placed capacitor to the clamping groove (101); A pressing plate (3), which is vertically arranged at the front end of the pusher arm (1) and is movable along the length direction of the pusher arm (1). Along the upward direction of the front end of the pusher arm (1), the pressing plate (3) is located outside the material pipe (2); Two tangent clamps (4), which are respectively arranged on both sides of the moving track of the pusher arm (1) and are on the same side of the material pipe (2) as the pressing plate (3); Two welding guns (5), which are respectively arranged on both sides of the moving track of the pusher arm (1) and are located between the material pipe (2) and the tangent clamp (4) on the same side. The two welding guns (5) are movable along the connecting line direction. Bundling holes (51) are arranged on both sides of the working part of the welding gun (5) for threading the lead wires (91) of the capacitor; The working parts of the tangent clamp (4) and the welding gun (5) are in the same horizontal range as the midpoint in the height direction of the clamping groove (101).

2. The flexible DC capacitor lead welding system according to claim 1, characterized in that One guide rail (11) parallel to the length direction of the pusher arm (1) is arranged on each side of the pusher arm (1). The guide rail (11) is slidably penetrated on a base (12). A rack meshing with a gear (13) is embedded in the middle section in the height direction on the outside of one of the guide rails (11). The gear (13) is coaxially arranged on the main shaft of a motor (14).

3. The flexible DC capacitor lead welding system according to claim 1, characterized in that, One feeding groove (21) is arranged on one side at the lower end of the material pipe (2) for conveying the capacitor to the lower end of the material pipe (2). A lifting plate (22) is arranged in the material pipe (2), and its lifting is controlled by a lifting cylinder (23) arranged at the bottom of the material pipe (2). Tilted upward spring pieces (24) are arranged at the same height on the opposite inner walls of the material pipe (2) for supporting the upper capacitor.

4. The flexible DC capacitor lead welding system according to claim 1, wherein, The pressing plate (3) is vertically arranged at the front end of a pull rod (31). The pull rod (31) is parallelly penetrated through a mounting plate (15) arranged on the top surface of the pusher arm (1). A stop block (32) is arranged at the rear end of the pull rod (31). A return spring (33) is sleeved on the part of the pull rod (31) corresponding to the position between the stop block (32) and the mounting plate (15); When the pressing plate (3) is attached to the front end of the pusher arm (1), the return spring (33) is in a compressed state; The bottom edge of the pressing plate (3) is lower than the top surface of the material pipe (2); A vertical control rod (6) corresponding to the outside of the tangent clamp (4) is arranged along the upward direction of the front end of the pusher arm (1), and it is vertically movable; 5. A flexible DC capacitor lead welding system according to claim 4, characterized in that The pull rod (31) includes a front rod (311) and a rear rod (312) which are rotatably connected at one end. The rotation axis is horizontally arranged and perpendicular to the pusher arm (1). The pressing plate (3) is arranged at the front end of the front rod (311), and the stop block (32) is arranged at the rear end of the rear rod (312); When the pressing plate (3) presses the capacitor, the front rod (311) penetrates through the mounting plate (15); When the front rod (311) is located outside the mounting plate (15), the distance between the pusher arm (1) and the pressing plate (3) is greater than the outer diameter of the capacitor to be welded; The bottom of the control rod (6) is provided at the top end of a support spring (61). The horizontal height of the lower end of the support spring (61) is kept fixed. When the support spring (61) is in a natural state, the top surface of the control rod (6) is higher than the bottom surface of the pressing plate (3). The side of the upper end of the control rod (6) facing the pushing arm (1) is a rear inclined surface (601), and the angle between it and the horizontal plane is less than or equal to 60 degrees. The side of the upper end of the control rod (6) opposite to the rear inclined surface (601) has a front inclined surface (602), and the angle between it and the vertical plane is less than or equal to 5 degrees and greater than 1 degree.

6. The flexible DC capacitor lead welding system according to claim 5, characterized in that, A T-shaped groove is formed along the length direction on the top surface of the pushing arm (1). A T-shaped block is provided at the bottom of the stopper (32), and the T-shaped block is slidably arranged in the T-shaped groove.

7. A flexible DC capacitor lead welding system according to claim 5, characterized in that, The control rod (6) is vertically arranged through a sliding block (62). A support plate is provided at the bottom of the sliding block (62), and the support spring (61) is arranged on the top surface of the support plate. The position of the sliding block (62) along the length direction of the pushing arm (1) has an adjustment function.

8. The flexible DC capacitor lead welding system according to claim 7, wherein, A discharge groove (63) is provided on the side of the sliding block (62) facing the material pipe (2) for receiving the unloaded capacitors.

9. The flexible DC capacitor lead welding system according to claim 5, wherein, A horizontally arranged convex strip (34) is provided at the lower end of the side of the pressing plate (3) facing the material pipe (2). A limiting groove (201) matching the convex strip (34) is formed on the outer wall of the material pipe (2) on the side facing the pressing plate (3). When the pressing plate (3) contacts the material pipe (2), the convex strip (34) is clamped in the limiting groove (201).

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