Circuit breaker moving contact spot welding device and spot welding process

Abstract

The invention relates to the field of spot welding machines, and discloses a circuit breaker moving contact spot welding device and a spot welding process, the circuit breaker moving contact spot welding device comprises a spot welding machine, a fixed table and a movable table are installed on the spot welding machine, the fixed table is located below the movable table and is provided with a lower electrode, and the movable table is provided with an upper electrode opposite to the lower electrode; a through hole for the upper electrode to penetrate through is formed in the top of the connecting groove, and grooves are formed in the two side walls of the connecting groove. According to the invention, through the design of the diagonal swing assembly and the spiral transmission, when the upper electrode moves downwards, the deviation rectifying seat stops after being in contact with the moving contact, the fixing frame moves downwards in a differential manner through the elastic piece, the connecting block in the spiral moving groove is driven to slide, the linear motion is converted into the rotation action of the diagonal swing arm, and the angle of the soft connection is corrected from the two sides; and angle deviation caused by manual placement can be corrected.

Description

Technical Field

[0001] This invention relates to the field of spot welding machines, and more particularly to a spot welding device and spot welding process for the moving contacts of a circuit breaker. Background Technology

[0002] In the manufacturing of low-voltage circuit breakers, a reliable electrical connection between the moving contact and the flexible connection is a crucial factor in ensuring circuit breaker performance. Currently, the connection between the moving contact and the flexible connection commonly employs resistance spot welding. Specifically, the flexible connection is positioned above the moving contact, and both ends are overlapped at a certain angle and then spot-welded for fixation. This angled overlap structure meets the internal spatial layout and conductivity requirements of the circuit breaker.

[0003] A search revealed that CN222830880U discloses a circuit breaker moving contact silver spot welding device with adjustment and buffering capabilities. It includes a silver spot welding device, a welding support device, a moving contact clamping cylinder, and a moving contact. The silver spot welding device includes a welding support, a welding push cylinder, a guide column, a main drive plate, and a welding adjustment assembly. The welding adjustment assembly includes an upper guide plate, a main locking plate, a silver spot welding column, a welding column fixing block, bolts, and a buffer spring.

[0004] In existing technologies, the overlapping and positioning of the flexible connector and the moving contact mainly relies on manual operation. Operators need to align the ends of the flexible connector and the moving contact to be welded and place them on the spot welding device. Existing spot welding devices lack an effective dynamic angle adjustment mechanism. When an angle deviation is detected by manual placement, the posture of the flexible connector cannot be automatically corrected by the mechanical structure. There are significant differences in the placement angle between different operators or between different batches by the same operator. This inconsistency in angle can lead to quality problems such as weld point position displacement, uneven weld nugget size, or even incomplete welding, which seriously affects the conductivity reliability and service life of the circuit breaker. Summary of the Invention

[0005] To address the problem mentioned above that existing spot welding devices lack an effective dynamic angle adjustment mechanism and cannot automatically correct the posture of the soft connection through mechanical structure when a manual placement angle deviation is detected, the present invention achieves this through the following technical solution.

[0006] This invention provides a spot welding device for moving contacts of a circuit breaker, including a spot welding machine. The spot welding machine is equipped with a fixed platform and a movable platform. The fixed platform is located below the movable platform and has a lower electrode. The movable platform has an upper electrode opposite to the lower electrode. The device also includes:

[0007] The correction seat has a connecting groove at the bottom and a through hole at the top for the upper electrode to pass through. The two side walls of the connecting groove are both grooved.

[0008] The diagonal swing assembly is located in the grooves on both sides of the connecting groove. The diagonal swing assembly includes two swing arms with their rotation centers arranged diagonally opposite each other and a transmission component that drives their rotation.

[0009] A fixing frame is used to fix the upper electrode and a correction seat is fitted on it.

[0010] The transmission component includes:

[0011] The fixed rod is mounted on a fixed frame at the top and has a telescopic groove at the bottom. A connecting block is installed on the inner wall of the telescopic groove.

[0012] The connecting rod is connected to the swing arm at one end and passes through the groove and extends into the telescopic groove at the other end. A spiral moving groove is opened on the surface of the connecting rod, and the connecting block is embedded in the moving groove.

[0013] When the upper electrode moves down, the correction seat stops after contacting the moving contact, and the fixed frame continues to move down and drives the swing arm to rotate through the transmission component, thus correcting the soft connection angle.

[0014] Preferably, a first elastic element is provided between the correction seat and the fixed frame, and the correction seat is elastically floatingly connected to the fixed frame through the first elastic element, which is a compression spring or a disc spring assembly.

[0015] Preferably, the bottom of the correction seat stops after contacting the moving contact, and the fixed frame continues to move downward under the drive of the moving table. The first elastic element is compressed, and the fixed frame drives the fixed rod to move downward. The connecting block at its bottom slides in the spiral moving groove of the connecting rod. The linear motion is converted into the rotational motion of the connecting rod by the inclined surface constraint of the moving groove, forcing the swing arm to rotate out of the groove.

[0016] Preferably, the helix angle α of the moving groove satisfies: 20°≤α≤40°, and the inner wall of the moving groove is inlaid with a wear-resistant bushing, and the connecting block is a cemented carbide cylindrical pin.

[0017] Preferred options also include:

[0018] A clamping seat is sleeved on the lower electrode, and the clamping seat has two fixing slots, which are symmetrically arranged.

[0019] There are two clamping heads, each located in a fixed groove, and one end of each clamping head has a bevel.

[0020] Preferably, the clamping seat includes:

[0021] A fixing plate, fixed to the lower electrode, is located at the bottom of the clamping seat;

[0022] There are two control panels, which are vertically mounted on the fixed plate. The bottom wall of the two fixed slots has a moving hole, through which the control panel passes and fits against the inclined surface.

[0023] When the correction seat presses down on the clamping seat, it moves downward, the control plate moves upward relative to the moving hole, the inclined surface of the clamping head is squeezed, the clamping head is pushed towards the center and clamps the moving contact.

[0024] Preferably, a third elastic element is provided between the fixing plate and the clamping seat, and the clamping seat is elastically floatingly connected to the fixing plate through the third elastic element. The third elastic element is a compression spring or a disc spring assembly.

[0025] Preferably, the inclination angle β of the inclined surface satisfies: 30°≤β≤50°, and the surface of the inclined surface is plated with a hard chrome layer.

[0026] Preferably, one end of the clamping head is connected to a second elastic element, and one end of the second elastic element is installed on the inner wall of the fixing groove.

[0027] The present invention also provides a spot welding process for moving contacts of a circuit breaker, and a spot welding device for moving contacts of a circuit breaker based on any of the above claims, comprising the following steps:

[0028] S1: Manually place the moving contact on the lower electrode, and the soft connector overlaps the upper surface of the moving contact. At this time, the moving contact is located in the center of the clamping seat, and the soft connector is in a natural drooping state.

[0029] S2: The moving stage drives the upper electrode to move downward, the correction seat contacts the clamping seat, the clamping seat compresses the third elastic element and moves downward, the control plate moves upward relative to the moving hole, squeezes the inclined surface of the clamping head, the clamping head pushes out towards the center, and clamps the moving contact; the correction seat stops moving downward, the fixed frame compresses the first elastic element and continues to move downward, the fixed rod pushes the connecting block to slide in the spiral moving groove, the connecting rod rotates and drives the swing arm to rotate, the diagonal swing arm rotates out of the alignment soft connection angle.

[0030] S3: The upper and lower electrodes press the flexible connector and the moving contact together, apply welding pressure and pass a pulse current to weld the flexible connector and the moving contact together;

[0031] S4: The moving stage drives the upper electrode to move upward: the correction seat disengages from the clamping seat, the third elastic element pushes the clamping seat to reset; the control board disengages from the inclined plane, the second elastic element pulls back the clamping head; the fixed frame drives the swing arm to retract into the groove, and the post-welded component is removed.

[0032] This invention provides a spot welding device and process for the moving contact of a circuit breaker. Compared with the prior art, it has the following advantages: Through the design of the diagonal swing assembly and the screw drive, when the upper electrode moves down, the correction seat stops after contacting the moving contact. The fixed frame moves down at a differential speed through the elastic element, driving the connecting block in the spiral moving groove to slide, converting the linear motion into the rotational motion of the diagonal swing arm, which corrects the angle of the soft connection from both sides, thus correcting the angle deviation caused by manual placement. Attached Figure Description

[0033] Figure 1This is a schematic diagram of the three-dimensional structure proposed in this invention.

[0034] Figure 2 This is a schematic diagram of the three-dimensional structure proposed in this invention from another perspective.

[0035] Figure 3 This is a schematic diagram of the moving stage, upper electrode, correction seat, swing arm, and fixed frame structure proposed in this invention.

[0036] Figure 4 This is a cross-sectional schematic diagram of the mobile platform and fixed frame proposed in this invention.

[0037] Figure 5 This is a schematic diagram of the swing arm in the deployed state proposed in this invention.

[0038] Figure 6 This is a schematic diagram of the fixed rod, connecting rod, and swing arm structure proposed in this invention.

[0039] Figure 7 This is an enlarged cross-sectional view of the fixing rod portion proposed in this invention.

[0040] Figure 8 This is a schematic diagram of the fixed platform, clamping seat, and clamping head structure proposed in this invention.

[0041] Figure 9 This is a schematic cross-sectional view of the clamping seat and clamping head proposed in this invention.

[0042] Figure 10 This is a schematic diagram showing the swing direction of the swing arm proposed in this invention.

[0043] The attached figures are labeled as follows:

[0044] 100. Spot welding machine; 101. Fixed table; 102. Lower electrode; 103. Moving table; 104. Upper electrode;

[0045] 200. Correction seat; 201. Swing arm; 202. Fixing frame; 203. First elastic element; 204. Fixing rod; 205. Connecting rod; 206. Moving groove; 207. Connecting block; 208. Groove;

[0046] 300, clamping seat; 301, fixing groove; 302, clamping head; 303, second elastic element; 304, control plate; 305, fixing plate; 306, third elastic element. Detailed Implementation

[0047] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0048] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0049] Example 1: Refer to Figures 1-9 A spot welding device for moving contacts of a circuit breaker includes a spot welding machine 100, on which a fixed platform 101 and a movable platform 103 are mounted. The fixed platform 101 is located below the movable platform 103 and is provided with a lower electrode 102. The movable platform 103 is provided with an upper electrode 104 opposite to the lower electrode 102. The device also includes:

[0050] The correction seat 200 has a connecting groove at the bottom and a through hole at the top for the upper electrode 104 to pass through. The two side walls of the connecting groove are provided with grooves 208. The connecting groove at the bottom of the correction seat 200 is used to accommodate the overlapping area of ​​the moving contact and the flexible connection to form an initial positioning space. The through hole at the top ensures that the upper electrode 104 passes through vertically to realize the pressure transmission during welding. Through the first elastic element 203 between the correction seat 200 and the fixing frame 202, the correction seat 200 stops moving down after contacting the moving contact, while the fixing frame 202 can continue to move with the upper electrode 104 to provide motion difference for subsequent correction actions.

[0051] Reference Figure 5 and Figure 10 The diagonal swing assembly is located in the grooves 208 on both sides of the connecting groove. The diagonal swing assembly includes two swing arms 201 with their rotation centers arranged diagonally and a transmission component that drives them to rotate. The rotation centers of the two swing arms 201 are arranged diagonally to form spatially intersecting force application points. Swing arms 201 are respectively set at the upper left and lower right corners of the rectangular connecting groove, and their rotation axes are perpendicular to each other to ensure that a bidirectional composite force can be applied when the soft connection is aligned.

[0052] Reference Figure 3 The fixing bracket 202 is fixed to the upper electrode 104 and fitted with the correction seat 200;

[0053] The transmission component includes:

[0054] Reference Figure 5 , Figure 6 and Figure 7 The top of the fixed rod 204 is installed on the fixed frame 202, and the bottom is provided with a telescopic groove. The inner wall of the telescopic groove is provided with a connecting block 207.

[0055] The connecting rod 205 has one end connected to the swing arm 201, and the other end passes through the groove 208 and extends into the telescopic groove. The surface of the connecting rod 205 is provided with a spiral moving groove 206, and the connecting block 207 is embedded in the moving groove 206.

[0056] When the upper electrode 104 moves down, the correction seat 200 stops after contacting the moving contact, and the fixed frame 202 continues to move down and drives the swing arm 201 to rotate through the transmission component, thus correcting the soft connection angle.

[0057] The fixed rod 204 is rigidly connected to the fixed frame 202 and moves up and down with the fixed frame 202. The connecting block 207 in the bottom telescopic groove serves as the transmission fulcrum. One end of the connecting rod 205 is fixedly connected to the swing arm 201, and the other end extends into the telescopic groove. The spiral moving groove 206 on its surface cooperates with the connecting block 207. When the fixed rod 204 moves down, the connecting block 207 slides along the inclined surface of the spiral groove. The linear motion is converted into the rotational motion of the connecting rod 205 by the inclined surface constraint, which in turn drives the swing arm 201 to rotate out of the groove 208 around the diagonal axis, realizing the adjustment of the soft connection angle.

[0058] In this embodiment, two sets of swing arms 201 with their rotation centers arranged diagonally opposite each other form a spatially intersecting corrective force field, such as... Figure 10 As shown, a bidirectional corrective force can be applied to the soft connection to effectively correct angular deviations in any direction, and it has stronger angular adaptability compared to a single-direction pushing structure; the linear motion of the fixed frame 202 is converted into the rotational motion of the swing arm 201 by using the spiral moving groove 206, and the transmission ratio can be precisely controlled by the spiral parameter to ensure the smoothness and controllability of the correction action.

[0059] As the upper electrode 104 moves downward with the moving stage 103, the bottom of the correction seat 200 first contacts the moving contact. Due to the buffering effect of the first elastic element 203, it stops moving downward. At this time, the moving contact and the flexible connection are at the initial angle of manual placement. The fixed frame 202 continues to move downward with the upper electrode 104, compressing the first elastic element 203, and at the same time driving the fixed rod 204 to move downward. The connecting block 207 slides downward along the inclined surface in the spiral moving groove 206, forcing the connecting rod 205 to rotate clockwise or counterclockwise. The swing arm 201 rotates out of the groove 208 and contacts the flexible connection. The diagonally arranged swing arms 201 act on the flexible connection with thrust in different directions, forming a torque couple, correcting the angular deviation between it and the moving contact. For example, the upper left swing arm 201 pushes to the lower right and the lower right swing arm 201 pushes to the upper left. The combined force of the two sides causes the soft connection to rotate around the lap joint to the ideal angle. After the swing arm 201 is fully extended, the upper electrode 104 continues to move down, compressing the first elastic element 203 to the limit position. At this time, the soft connection is clamped between the correction seat 200 and the moving contact, the angle deviation is eliminated, and the welding stage begins.

[0060] Reference Figure 4 and Figure 5 A first elastic element 203 is provided between the correction seat 200 and the fixed frame 202. The correction seat 200 and the fixed frame 202 form an elastic floating connection through the first elastic element 203. The first elastic element 203 is a compression spring or a disc spring assembly.

[0061] The first elastic element 203 between the correction seat 200 and the fixed frame 202 can absorb the impact force during the welding process, avoid damage to the moving contact caused by rigid contact, and after the first elastic element 203 is compressed, its compressive force can drive the correction seat 200 to reset.

[0062] After the bottom of the correction seat 200 contacts the moving contact, it stops. The fixed frame 202 continues to move downward under the drive of the moving table 103. The first elastic element 203 is compressed. The fixed frame 202 drives the fixed rod 204 to move downward. The connecting block 207 at its bottom slides in the spiral moving groove 206 of the connecting rod 205. The linear motion is converted into the rotational motion of the connecting rod 205 by the inclined surface constraint of the moving groove 206, which forces the swing arm 201 to rotate out of the groove 208. The helix angle α of the moving groove 206 satisfies: 20°≤α≤40°. The inner wall of the moving groove 206 is inlaid with a wear-resistant bushing. The connecting block 207 is a hard alloy cylindrical pin.

[0063] Reference Figure 8 and Figure 9 A clamping seat 300 is sleeved on the lower electrode 102. The clamping seat 300 has two fixing grooves 301, which are symmetrically arranged.

[0064] There are two clamping heads 302, which are respectively located in the fixing groove 301. One end of the clamping head 302 is provided with a bevel, and the inclination angle β of the bevel satisfies: 30°≤β≤50°, and the surface of the bevel is plated with a hard chrome layer.

[0065] The clamping base 300 includes:

[0066] The fixing plate 305 is fixed to the lower electrode 102 and is located at the bottom of the clamping base 300;

[0067] There are two control panels 304, which are vertically mounted on the fixed plate 305. The bottom walls of the two fixed slots 301 are provided with moving holes, and the control panels 304 pass through the moving holes and fit against the inclined surface.

[0068] When the correction seat 200 presses down on the clamping seat 300, it moves downward, and the control plate 304 moves upward relative to the moving hole. The inclined surface of the clamping head 302 is squeezed, and the clamping head 302 is pushed towards the center and clamps the moving contact. A third elastic element 306 is provided between the fixed plate 305 and the clamping seat 300. One end of the clamping head 302 is connected to a second elastic element 303, and one end of the second elastic element 303 is installed on the inner wall of the fixed groove 301. The clamping seat 300 and the fixed plate 305 form an elastic floating connection through the third elastic element 306. The third elastic element 306 is a compression spring or a disc spring assembly.

[0069] The fixing plate 305 serves as a basic support component, fixed to the lower electrode 102 by bolts, providing the installation reference for the clamping seat 300. A third elastic element 306 is provided between its top surface and the body of the clamping seat 300 to form an elastic floating connection, allowing the clamping seat 300 to move up and down in the vertical direction. The body of the clamping seat 300 is sleeved on the outside of the lower electrode 102, and two symmetrical fixing grooves 301 are opened on the bottom surface to accommodate the clamping head 302 and the second elastic element 303. The bottom wall of the fixing groove 301 is provided with a moving hole for the control plate 304 to pass through and contact the inclined surface of the clamping head 302. The second elastic element 303 is an elastic band or a spring. The second elastic element 303 provides a reset pull when the clamping head 302 is released, preventing the clamping head 302 from being stuck in the clamping position due to inertia or friction, ensuring smooth part removal. The control plate 304 is vertically fixed to the top surface of the fixing plate 305, passes through the moving hole, and fits against the inclined surface of the clamping head 302. When the clamping seat 300 is pressed down, the control plate 304 moves up relative to the moving hole, and pushes the clamping head 302 to move horizontally through the inclined surface.

[0070] The inclined surface at one end of the clamping head 302 allows the vertical pressure to be decomposed into a horizontal clamping force and a vertical supporting force; the third elastic element 306 provides the reset force of the clamping seat 300, while buffering the impact force when the correction seat 200 is pressed down. When the correction seat 200 contacts the clamping seat 300, it ensures that the upward stroke of the control board 304 is sufficient to drive the clamping head 302 to complete the clamping action.

[0071] Example 2: A spot welding process for the moving contact of a circuit breaker, comprising the following steps:

[0072] S1: Manually place the moving contact on the lower electrode 102, and the soft connection overlaps the upper surface of the moving contact. At this time, the moving contact is located at the center of the clamping seat 300, and the soft connection is in a natural drooping state.

[0073] S2: The moving stage 103 drives the upper electrode 104 to move downward, the correction seat 200 contacts the clamping seat 300, the clamping seat 300 compresses the third elastic element 306 and moves downward, the control plate 304 moves upward relative to the moving hole, squeezes the inclined surface of the clamping head 302, the clamping head 302 pushes towards the center, and clamps the moving contact; the correction seat 200 stops moving downward, the fixed frame 202 compresses the first elastic element 203 and continues to move downward, the fixed rod 204 pushes the connecting block 207 to slide in the spiral moving groove 206, the connecting rod 205 rotates and drives the swing arm 201 to rotate, the diagonal swing arm 201 rotates out of the alignment soft connection angle;

[0074] S3: The upper electrode 104 and the lower electrode 102 press the flexible connector and the moving contact together, apply welding pressure and pass in pulse current to weld the flexible connector and the moving contact together.

[0075] S4: The moving stage 103 drives the upper electrode 104 to move upward: the correction seat 200 disengages from the clamping seat 300, and the third elastic element 306 pushes the clamping seat 300 to reset; the control board 304 disengages from the inclined plane, and the second elastic element 303 pulls back the clamping head 302; the fixed frame 202 drives the swing arm 201 to retract into the groove 208, and the post-welded component is taken out.

[0076] Example 3: The difference between this example and Example 1 is that the transmission component includes a power source, the power shaft of the power source is connected to the swing arm 201, and the power source is a stepper motor or a servo motor.

[0077] In summary, compared with existing technologies, it has the following beneficial effects:

[0078] By designing the diagonal swing assembly and the screw drive, when the upper electrode 104 moves down, the correction seat 200 stops after contacting the moving contact. The fixed frame 202 moves down at a differential speed through the elastic element, driving the connecting block 207 in the spiral moving groove 206 to slide, converting the linear motion into the rotational motion of the diagonal swing arm 201, and correcting the angle of the soft connection from both sides, which can correct the angle deviation caused by manual placement.

[0079] The first elastic element 203 between the straightening seat 200 and the fixed frame 202, and the third elastic element 306 between the clamping seat 300 and the fixed plate 305 form a double-layer elastic buffer structure, which can adapt to the thickness tolerance of the moving contact and avoid rigid contact damage to the workpiece. The clamping seat 300 achieves symmetrical clamping of the moving contact through inclined plane transmission. When the straightening seat 200 is pressed down, the control plate 304 pushes the inclined plane of the clamping head 302 to move synchronously towards the center to form a stable positioning and ensure that the moving contact has no displacement during the welding process.

[0080] The linear motion of the upper electrode 104 drives the correction and clamping action. The structure is simple and reliable with low maintenance cost. It can shorten the single cycle time from manual loading to welding completion. The spatial force field design of the diagonal swing arm 201 can adapt to the three-dimensional overlapping structure with the soft connection on the top and the moving contact on the bottom.

[0081] Therefore, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the foregoing disclosure, and it should be understood that in some cases, certain features of the invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terminology used in the following claims and / or the specific embodiments disclosed as the best mode for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the invention will be defined only by the appended claims.

Claims

1. A spot welding device for moving contacts of a circuit breaker, comprising a spot welding machine (100), wherein a fixed platform (101) and a movable platform (103) are mounted on the spot welding machine (100), the fixed platform (101) is located below the movable platform (103) and is provided with a lower electrode (102), and the movable platform (103) is provided with an upper electrode (104) opposite to the lower electrode (102), characterized in that, Also includes: The correction seat (200) has a connecting groove at the bottom and a through hole at the top for the upper electrode (104) to pass through. The two side walls of the connecting groove are provided with grooves (208). The diagonal swing assembly is located in the groove (208) on both sides of the connecting groove. The diagonal swing assembly includes two swing arms (201) with their rotation centers arranged diagonally opposite each other and a transmission component that drives them to rotate. A fixing bracket (202) is fixed to the upper electrode (104) and fitted with a correction seat (200); The transmission component includes: The top of the fixed rod (204) is mounted on the fixed frame (202), and the bottom is provided with a telescopic groove. A connecting block (207) is installed on the inner wall of the telescopic groove. The connecting rod (205) is connected to the swing arm (201) at one end and passes through the groove (208) and extends into the telescopic groove at the other end. The surface of the connecting rod (205) is provided with a spiral moving groove (206), and the connecting block (207) is embedded in the moving groove (206). When the upper electrode (104) moves down, the correction seat (200) stops after contacting the moving contact, and the fixed frame (202) continues to move down and drives the swing arm (201) to rotate through the transmission component, thus correcting the soft connection angle.

2. The circuit breaker moving contact spot welding device according to claim 1, characterized in that, A first elastic element (203) is provided between the correction seat (200) and the fixed frame (202). The correction seat (200) and the fixed frame (202) are connected in an elastic floating manner through the first elastic element (203). The first elastic element (203) is a compression spring or a disc spring assembly.

3. The circuit breaker moving contact spot welding device according to claim 2, characterized in that, After the bottom of the correction seat (200) contacts the moving contact, it stops. The fixed frame (202) continues to move down under the drive of the moving table (103). The first elastic element (203) is compressed. The fixed frame (202) drives the fixed rod (204) to move down. The connecting block (207) at its bottom slides in the spiral moving groove (206) of the connecting rod (205). The linear motion is converted into the rotational motion of the connecting rod (205) by the inclined surface constraint of the moving groove (206), which forces the swing arm (201) to rotate out of the groove (208).

4. The circuit breaker moving contact spot welding device according to claim 3, characterized in that, The helix angle α of the moving groove (206) satisfies: 20°≤α≤40°, and the inner wall of the moving groove (206) is inlaid with a wear-resistant bushing, and the connecting block (207) is a cemented carbide cylindrical pin.

5. The circuit breaker moving contact spot welding device according to claim 1, characterized in that, Also includes: A clamping seat (300) is sleeved on the lower electrode (102). The clamping seat (300) has two fixing slots (301) which are symmetrically arranged. There are two clamping heads (302), which are respectively located in the fixing groove (301). One end of the clamping head (302) is provided with a bevel.

6. The circuit breaker moving contact spot welding device according to claim 5, characterized in that, The clamping base (300) includes: A fixing plate (305) is fixed to the lower electrode (102) and located at the bottom of the clamping base (300); There are two control panels (304), which are vertically mounted on the fixed plate (305). The bottom walls of the two fixed slots (301) are provided with moving holes. The control panel (304) passes through the moving holes and fits against the inclined surface. When the correction seat (200) presses down on the clamping seat (300), it moves downward, the control plate (304) moves upward relative to the moving hole, the inclined surface of the clamping head (302) is squeezed, and the clamping head (302) is pushed towards the center and clamps the moving contact.

7. The circuit breaker moving contact spot welding device according to claim 6, characterized in that, A third elastic element (306) is provided between the fixed plate (305) and the clamping seat (300). The clamping seat (300) and the fixed plate (305) are connected in an elastic floating manner through the third elastic element (306). The third elastic element (306) is a compression spring or a disc spring assembly.

8. The circuit breaker moving contact spot welding device according to claim 5, characterized in that, The inclination angle β of the inclined plane satisfies: 30°≤β≤50°, and the surface of the inclined plane is plated with a hard chrome layer.

9. The circuit breaker moving contact spot welding device according to claim 5, characterized in that, One end of the clamping head (302) is connected to a second elastic element (303), and one end of the second elastic element (303) is installed on the inner wall of the fixing groove (301).

10. A spot welding process for moving contacts of a circuit breaker, based on the spot welding device for moving contacts of a circuit breaker according to any one of claims 1-9, characterized in that, Includes the following steps: S1: The moving contact is manually placed on the lower electrode (102), and the soft connection is overlapped on the upper surface of the moving contact. At this time, the moving contact is located at the center of the clamp (300), and the soft connection is in a natural drooping state. S2: The moving stage (103) drives the upper electrode (104) to move down, the correction seat (200) contacts the clamping seat (300), the clamping seat (300) compresses the third elastic element (306) to move down, the control plate (304) moves up relative to the moving hole, squeezes the inclined surface of the clamping head (302), the clamping head (302) pushes towards the center, and clamps the moving contact; the correction seat (200) stops moving down, the fixed frame (202) compresses the first elastic element (203) to continue moving down, the fixed rod (204) pushes the connecting block (207) to slide in the spiral moving groove (206), the connecting rod (205) rotates and drives the swing arm (201) to rotate, the diagonal swing arm (201) rotates out of the corrected soft connection angle; S3: The upper electrode (104) and the lower electrode (102) press the soft connector and the moving contact together, apply welding pressure and pass in pulse current to weld the soft connector and the moving contact together; S4: The moving stage (103) drives the upper electrode (104) to move upward: the correction seat (200) disengages from the clamping seat (300), and the third elastic element (306) pushes the clamping seat (300) to reset; the control board (304) disengages from the inclined plane, and the second elastic element (303) pulls back the clamping head (302); the fixed frame (202) drives the swing arm (201) to retract into the groove (208) and remove the post-welded component.

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