Spot welding device for clamp

Abstract

The invention relates to the technical field of metal welding equipment, in particular to a spot welding device for a clamp. Comprising a spot welding machine, the spot welding machine is slidably connected with a placing plate, the spot welding machine is fixedly connected with two first driving parts, the telescopic ends of the first driving parts are fixedly connected with the placing plate, the placing plate is rotatably connected with a rotating ring, and the rotating ring is fixedly connected with a placing seat; and the rotating ring is slidably connected with two symmetrically-distributed connecting rods, the connecting rods are fixedly connected with a fixing cylinder, a pressing piece is slidably connected into the fixing cylinder in a sealed mode, and a first elastic piece is arranged between the fixing cylinder and the pressing piece. The edges of the two lugs are pressed in advance through the two pressing pieces correspondingly, the gap between the elastic part lug and the ring body is reduced before welding, the rubbing probability of the welding electrode and the elastic part lug is reduced, and therefore the external form of the welding electrode is protected, the service life of the welding electrode is prolonged, and the welding quality of a hoop is improved.

Description

Technical Field

[0001] This invention relates to the field of metal welding equipment technology, and in particular to a spot welding device for clamps. Background Technology

[0002] Clamps, as a basic yet crucial mechanical fastener, are widely used in automotive manufacturing, aerospace, engineering machinery, and various fluid pipeline systems. Their core function is to apply uniform clamping force to the fastener through an adjustable ring structure, thereby achieving reliable connection, sealing, and protection. A typical clamp usually consists of two parts: a ring body and a tightening part. The ring body is C-shaped and directly bears the task of clamping the workpiece. The tightening part, also known as the lap joint, is the clamp's adjustment and locking mechanism, usually composed of lugs or lap strips extending from both ends of the ring body. Tightening and loosening are achieved through mechanisms such as bolts, worm gears, or self-locking teeth. In the manufacturing process, the ring body and the tightening part are often produced as independent stamped parts or sheet metal parts, and ultimately need to be welded together as a whole.

[0003] Due to the elastic stress and slight deformation of the lugs in the tensioning part after stamping, the lugs cannot fit tightly against the ring body at the welding station, often exhibiting a warping phenomenon. Currently available clamp spot welding machines typically rely on the welding electrode to forcibly press the warped tensioning part against the ring body before welding. In other words, in addition to its original function of conducting electricity and transmitting pressure, the welding electrode also needs to have an additional pressing function. During this process, the welding electrode will rub and scrape against the warped inclined surface, causing wear and even cracking of the welding electrode. This not only significantly shortens the life of the welding electrode, but also affects the current distribution due to the change in the shape of the working surface of the welding electrode, reducing the welding quality of both. Summary of the Invention

[0004] In order to overcome the shortcomings mentioned in the background art, the present invention provides a spot welding device for clamps.

[0005] Technical Solution: A spot welding device for clamps includes a spot welding machine, a placement plate slidably connected to the spot welding machine, two symmetrically distributed first driving members fixedly connected to the spot welding machine, the telescopic ends of the first driving members fixedly connected to the placement plate, a rotating ring rotatably connected to the placement plate, a driving module for driving the rotating ring to rotate on the placement plate, a placement seat fixedly connected to the rotating ring, two symmetrically distributed connecting rods slidably connected to the rotating ring, a fixed cylinder fixedly connected to the connecting rods, a pressing member slidably sealed inside the fixed cylinder, the pressing member for pressing the lugs of the corresponding tightness part, a first elastic element provided between the fixed cylinder and the pressing member, a pulling component for driving the two connecting rods to move on the rotating ring, and a fixing component for fixing the clamp pins on the placement seat.

[0006] Furthermore, it is particularly preferred that the pulling assembly includes two symmetrically distributed second elastic elements, each corresponding to one of the two connecting rods. The second elastic elements are fixedly connected between the corresponding connecting rod and the rotating ring. The rotating ring is rotatably connected to a toothed ring. A pull rope is fixedly connected between the connecting rod and the toothed ring. The placement plate is fixedly connected to a second driving member. The output shaft of the second driving member is fixedly connected to a transmission gear. The toothed ring meshes with the transmission gear.

[0007] Furthermore, it is particularly preferred that the fixing component includes two symmetrically distributed elastic push rods, both of which are fixedly connected to the placement base, and the rotating ring is fixedly connected to two symmetrically distributed protrusions, with the central axis of the elastic push rod coinciding with the central axis of the corresponding protrusion.

[0008] Furthermore, it is particularly preferred that the pressing member consists of a connecting shaft, a piston plate, a third elastic element, and a rotating roller. The connecting shaft and the piston plate are both slidably and sealed to the corresponding fixed cylinder. The piston plate is located between the connecting shaft and the corresponding fixed cylinder. The third elastic element is fixedly connected between the connecting shaft and the piston plate. The rotating roller is rotatably connected to the connecting shaft. The first elastic element is located between the fixed cylinder and the piston plate.

[0009] Furthermore, it is particularly preferred that the connecting shaft is slidably connected to two symmetrically distributed positioning blocks, which are located on both sides of the rotating roller.

[0010] Furthermore, it is particularly preferred that one of the positioning blocks on the same connecting shaft is slidably connected to a sliding shaft, and a fourth elastic element is provided between the sliding shaft and the positioning block.

[0011] Furthermore, it is particularly preferred that another positioning block on the same connecting shaft is slidably connected to the sliding shaft, the sliding shaft is slidably connected to a slider, and a fifth elastic element is provided between the slider and the positioning block.

[0012] Furthermore, it is particularly preferred that the connecting shaft is rotatably connected to a rotating cylinder, the rotating cylinder is provided with two symmetrically distributed sliding grooves, and both the sliding shaft and the slider are fixedly connected with locking blocks, with the two locking blocks sliding in their respective sliding grooves.

[0013] Furthermore, it is particularly preferred that the connecting shaft is rotatably connected to a rotating wheel, the rotating wheel is fixedly connected to an adjacent rotating drum, a sixth elastic element is provided between the rotating wheel and the adjacent connecting shaft, and a connecting rope is fixedly connected between the two rotating wheels, with the two ends of the connecting rope respectively wound around the two rotating wheels.

[0014] Furthermore, it is particularly preferred that the rotating ring is fixedly connected to a support wheel, the support wheel is located on the axis of symmetry of the two rotating wheels, and the connecting rope passes around the support wheel.

[0015] The present invention has the following advantages: 1. The present invention pre-presses the edges of the two ear pieces by two pressing parts, thereby reducing the gap between the loose ear piece and the ring body before welding, reducing the probability of the welding electrode rubbing against the loose ear piece, thus protecting the external shape of the welding electrode, improving the service life of the welding electrode and the welding quality of the clamp.

[0016] 2. Two rotating rollers are used to roll and press the two ear pieces from the top to the edge. This rolling and compacting method can smoothly remove air, evenly extend the ear pieces of the loose and tight parts, guide the ear pieces to gradually and evenly fit along the curved surface of the ring, reduce the probability of dead corners between the ear pieces and the ring, and improve the welding quality between the ring and the loose and tight parts.

[0017] 3. By accumulating elastic force through the third elastic element, the connecting shaft can achieve dynamic self-adaptation at the point where the thickness of the ear piece changes. When the roller rolls from the thick area of ​​the overlapping weld to the thin area, the third elastic element can instantly compensate for the height difference, thereby enabling the roller to continuously provide stable bonding pressure to the ear piece, reducing the probability of the ear piece separating from the ring body, and significantly improving the welding quality of the ring body and the loose part.

[0018] 4. By applying a lateral thrust to the lugs through two positioning blocks, the relative circumferential position of the lugs and the ring body is forcibly corrected, reducing the probability of misalignment caused by part tolerances or placement deviations, ensuring that the weld points of the ring body and the lugs fall strictly in the theoretical design position, and reducing phenomena such as reduced welding strength, stress concentration or incomplete welding caused by misalignment. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the placement plate and rotating ring of the present invention; Figure 3 This is a three-dimensional structural diagram of the rotating ring and toothed ring of the present invention; Figure 4 This is an exploded three-dimensional structural diagram of the rotating ring and toothed ring of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the fixing cylinder of the present invention; Figure 6 This is a three-dimensional structural diagram of the positioning block of the present invention; Figure 7 This is a three-dimensional structural diagram of the sliding shaft and slider of the present invention; Figure 8 This is a three-dimensional structural diagram of the rotating drum and slide of the present invention.

[0020] In the diagram: 1: Spot welding machine, 2: Placement plate, 3: First driving component, 4: Rotating ring, 5: Drive module, 6: Placement seat, 7: Connecting rod, 8: Fixed cylinder, 9: Pressing component, 10: First elastic component, 201: Second elastic component, 202: Gear ring, 203: Pull rope, 204: Second driving component, 205: Transmission gear, 301: Elastic push rod, 302: Protrusion, 401: Connecting shaft, 402: Piston plate, 403: Third elastic component, 404: Rotating roller, 501: Positioning block, 502: Sliding shaft, 503: Fourth elastic component, 504: Slider, 505: Fifth elastic component, 601: Rotating cylinder, 602: Slide groove, 603: Locking block, 701: Rotating wheel, 702: Sixth elastic component, 703: Connecting rope, 704: Support wheel. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the invention and are not intended to limit the invention.

[0022] After being stamped, the lugs of the elastic part often lift up at the welding station due to residual elastic stress and slight deformation, failing to fit properly with the ring body. Existing clamp spot welding machines usually rely on the welding electrode to forcibly press down the lugs to achieve fit before welding. This causes the electrode to bear the additional function of pressing in addition to conducting electricity and applying pressure. During this process, the electrode rubs and scratches against the tilted and lifted surface, which can easily lead to electrode wear or even cracking. This not only significantly shortens its service life but also affects the current distribution due to the deformation of the working surface, thereby reducing the welding quality. Example 1

[0023] This embodiment provides a spot welding device for clamps, used to reduce the wear of welding electrodes.

[0024] like Figures 1-6As shown, the device includes a spot welding machine 1, which is an existing piece of equipment. It primarily uses electric current to spot weld clamps. A placement plate 2 is slidably connected to the front of the spot welding machine 1. Two symmetrically distributed first driving components 3, which are electric push rods, are fixedly connected to the spot welding machine 1. The telescopic ends of the first driving components 3 are fixedly connected to the placement plate 2. The telescopic ends of the two first driving components 3 together drive the placement plate 2 to move up and down. A rotating ring 4 is rotatably connected to the middle of the placement plate 2. The placement plate 2 is equipped with a drive module 5 for driving the rotating ring 4 to rotate. The drive module 5 consists of a servo motor, a pulley, and a belt. The servo motor is fixedly connected to the placement plate 2, the pulley is fixedly connected to the output shaft of the servo motor, and the belt is wound between the pulley and the rotating ring 4, thereby achieving active driving of the rotating ring 4. A placement seat 6, which is a semi-circular ring, is fixedly connected to the rotating ring 4, and the center of the circle containing its cross-section is located on the rotation axis of the rotating ring 4. The placement seat 6 is used to place the ring body, and the placement seat 6 is provided with a through groove to facilitate the welding electrode to fit with the ring body. The rotating ring 4 is slidably connected to two symmetrically distributed connecting rods 7. The rotating ring 4 is provided with an arc-shaped slide, the center of which is located on the central axis of the rotating ring 4. The connecting rods 7 slide within the arc-shaped slide. The connecting rods 7 are fixedly connected to a fixing cylinder 8, which is connected to an external gas injection device. A pressing element 9 is slidably connected inside the fixing cylinder 8. The pressing element 9 is used to press the ear piece of the corresponding tension part. A first elastic element 10 is provided between the fixing cylinder 8 and the pressing element 9. The first elastic element 10 is a tension spring, which is used to drive the pressing element 9 to reset. In the initial state, the first elastic element 10 is in an unstretched state. The gas injection device controls the protrusion amplitude of the pressing element 9 by controlling the gas content in the fixing cylinder 8. The rotating ring 4 is provided with a pulling component for driving the two connecting rods 7 to move. The placement seat 6 is provided with a fixing component for fixing the clamp pin.

[0025] like Figures 1-4 As shown, the pulling assembly includes two symmetrically distributed second elastic elements 201, each corresponding to one of the two connecting rods 7. Each second elastic element 201 is a tension spring, used to drive the adjacent connecting rod 7 to its reset position. Initially, the second elastic element 201 is in an unstretched state. The second elastic element 201 is fixedly connected between the corresponding connecting rod 7 and the rotating ring 4. A toothed ring 202 is rotatably connected to the outside of the rotating ring 4. A pull rope 20 is fixedly connected between the connecting rod 7 and the toothed ring 202. 3. The pull rope 203 is embedded in the arc-shaped slide of the rotating ring 4, and the two pull ropes 203 pass through the arc-shaped slide and reach the outside through the rotating ring 4. The right side of the placement plate 2 is fixedly connected to the second drive component 204, which is a servo motor. The output shaft of the second drive component 204 is fixedly connected to the transmission gear 205. The gear ring 202 meshes with the transmission gear 205. The second drive component 204 realizes the reverse sliding of the two connecting rods 7 through the transmission gear 205, the gear ring 202 and the two pull ropes 203.

[0026] like Figure 3 As shown, the fixing component includes two symmetrically distributed elastic push rods 301. The distance between the two elastic push rods 301 is equal to the distance between the two pins of the clamp's tightening part. The fixing part of the elastic push rod 301 is connected to an external air injection device. The two symmetrically distributed elastic push rods 301 are fixedly connected to the placement base 6. The rotating ring 4 is fixedly connected to two symmetrically distributed protrusions 302. The central axis of the elastic push rod 301 coincides with the central axis of the corresponding protrusion 302. The air injection device injects gas into the fixing part of the elastic push rod 301, causing the telescopic end of the elastic push rod 301 to protrude and press the pins of the clamp's tightening part onto the corresponding protrusion 302, thereby achieving the fixing and positioning of the tightening part.

[0027] like Figure 6 As shown, the pressing component 9 consists of a connecting shaft 401, a piston plate 402, a third elastic element 403, and a rotating roller 404. Both the connecting shaft 401 and the piston plate 402 are slidably connected to the corresponding fixed cylinder 8. The piston plate 402 is located between the connecting shaft 401 and the corresponding fixed cylinder 8. When the connecting shaft 401 drives the rotating roller 404 to contact the ear piece of the tensioning part, the first elastic element 10 is stretched first. When the rotating roller 404 contacts the ear piece, the connecting shaft 401 is limited. At this moment, the gas pushes the piston plate 402 to slide, and the third elastic element 403 is compressed. Energy is stored. The third elastic element 403 is fixedly connected between the connecting shaft 401 and the piston plate 402. The third elastic element 403 is a spring. The third elastic element 403 is used to push the connecting shaft 401 to adapt to the thickness change of the lug of the tension part. The third elastic element 403 is initially in an uncompressed state. The rotating roller 404 is rotatably connected to the connecting shaft 401. The first elastic element 10 is located between the fixed cylinder 8 and the piston plate 402. The first elastic element 10 drives the third elastic element 403 and the connecting shaft 401 to reset by pulling the piston plate 402.

[0028] Working principle: When welding clamps is required, the worker places the ring on the placement seat 6 with the notch of the ring at the top. Then, the tensioning part is placed on the top of the ring, aligning the pin of the tensioning part with the corresponding elastic push rod 301 and protrusion 302. The external air injection device is then activated, injecting gas into the fixing parts of the two elastic push rods 301 and the two fixing cylinders 8. This causes the gas in the fixing parts of the elastic push rods 301 to push their extension ends outwards, pressing the pin of the tensioning part onto the corresponding protrusion 302, thus securing the clamp. The gas inside the cylinder 8 drives the connecting shaft 401 to extend outward through the piston plate 402 and the third elastic element 403. At the same time, the first elastic element 10 is stretched. This continues until the connecting shaft 401 drives the rotating roller 404 on it to contact the lug of the tensioning part. At this point, the connecting shaft 401 can no longer move. The gas pushes the piston plate 402 to continue sliding along the fixed cylinder 8. At the same time, the third elastic element 403 is compressed. This continues until the third elastic element 403 is compressed to its limit. Then, the external gas injection device is turned off. At this point, the splicing work of the ring and the tensioning part is completed.

[0029] After the splicing of the ring body and the tensioning part is completed, the second drive component 204 is turned on, causing the output shaft of the second drive component 204 to drive the transmission gear 205 on it to rotate. The transmission gear 205 drives the gear ring 202 to rotate around the rotating ring 4. The gear ring 202 drives the two connecting rods 7 to slide back along the rotating ring 4 by pulling the two pull ropes 203. At the same time, the two second elastic elements 201 are stretched. The connecting rods 7 drive the fixed cylinder 8 on them to move synchronously. The fixed cylinder 8 drives the connecting shaft 401 inside it to move synchronously. The connecting shaft 401 drives the rotating roller 404 on it to move synchronously, so that the rotating roller 404 presses and fits the lug of the tensioning part. This continues until the connecting shaft 401 drives the rotating roller 404 to move to the edge of the lug of the tensioning part. Then the second drive component 204 is turned off. In this way, the lug of the tensioning part fits tightly against the ring body, reducing the wear of the subsequent welding electrodes and improving the welding quality of both.

[0030] When the rotating roller 404 moves to the edge of the adjacent ear piece, the ear piece fits against the ring body. Then, the drive module 5 and the second drive component 204 are activated, causing the rotating ring 4 to rotate around the placement plate 2. Simultaneously, the output shaft of the second drive component 204 drives the gear ring 202 to rotate synchronously with the rotating ring 4 via the transmission gear 205, thereby switching the welding position of the spot welding machine 1 on both. Then, the height of the placement plate 2 is adjusted by the spot welding machine 1 and the two first drive components 3 to achieve welding between the two. After the clamp welding is completed, the drive module 5 and the second drive component 204 are operated to drive the rotating ring 4 and the gear ring 202 to return to their initial positions. Simultaneously, the telescopic ends of the two first driving components 3 drive the placement plate 2 to reset. During this period, the two second elastic components 201 reset and pull the two connecting rods 7 to reset and slide along the rotating ring 4. The external air injection device is turned on to draw back the gas in the fixed part of the fixed cylinder 8 and the elastic push rod 301, so that the telescopic ends of the pressing component 9 and the elastic push rod 301 are reset to the initial position. The telescopic ends of the pressing component 9 and the elastic push rod 301 are separated from the clamp. During this period, the first elastic component 10 and the third elastic component 403 are reset to the initial state. Then the workers remove the welded clamp. When welding is required again, the above steps are repeated.

[0031] During the welding process described above, when the rotating roller 404 moves to the edge of the ear piece of the loose and tight part, since the ear piece is welded on both sides, there is a thickness change in the ear piece of the loose and tight part. When the rotating roller 404 passes through the thickness change area, the compressed third elastic element 403 pushes the connecting shaft 401 to extend outward along the fixed cylinder 8, so that the connecting shaft 401 drives the rotating roller 404 on it to continue to move in contact with the ear piece of the loose and tight part. This continues until the rotating roller 404 moves to the edge of the ear piece of the loose and tight part, ensuring the degree of contact between the ear piece and the ring body and improving the welding quality of both. Example 2

[0032] This embodiment provides a spot welding device for clamps, which is a further improvement on the basis of embodiment 1.

[0033] like Figures 5-7 As shown, two symmetrically distributed positioning blocks 501 are slidably connected to the connecting shaft 401. The two symmetrically distributed positioning blocks 501 are located on the front and rear sides of the rotating roller 404, respectively. Taking the two positioning blocks 501 on the same connecting shaft 401 as an example, the rear positioning block 501 is slidably connected to the sliding shaft 502. A fourth elastic element 503, which is a spring, is provided between the sliding shaft 502 and the positioning block 501 to connect the sliding shaft 502 and the rear positioning block 501 and to compensate for the relative movement between the two. The front positioning block 501 is slidably connected to the sliding shaft 502. The sliding shaft 502 is slidably connected to the slider 504. A fifth elastic element 505, which is a spring, is provided between the slider 504 and the positioning block 501 to connect the slider 504 and the front positioning block 501 and to compensate for the relative movement between the two.

[0034] like Figures 5-8 As shown, a rotating cylinder 601 is rotatably connected to a connecting shaft 401. The rotating cylinder 601 has two symmetrically distributed sliding grooves 602, which are helical grooves. A locking block 603 is fixedly connected to both the sliding shaft 502 and the slider 504. The two locking blocks 603 slide within their respective sliding grooves 602. The rotating cylinder 601 drives the sliding grooves 602 to rotate, enabling the two locking blocks 603 to move in opposite directions. This, through the sliding shaft 502, the fourth elastic element 503, the slider 504, and the fifth elastic element 505, drives the two positioning blocks 501 to move in opposite directions, achieving the positioning and alignment of the tensioning lugs and the ring body. A rotating wheel 701 is rotatably connected to the connecting shaft 401. The rotating wheel 701 is fixedly connected to the adjacent rotating cylinder 601. A sixth elastic element 702 is provided between the rotating wheel 701 and the adjacent connecting shaft 401. The elastic element 702 is a torsion spring. The sixth elastic element 702 is used to drive the adjacent rotating wheel 701 to reset. In the initial state, it is in an untwisted state. A connecting rope 703 is fixedly connected between the two rotating wheels 701. The two ends of the connecting rope 703 are respectively wound around the two rotating wheels 701. The two ends of the connecting rope 703 are in opposite directions to the winding direction of the two rotating wheels 701. When the two connecting shafts 401 move away from each other, the force of the connecting rope 703 can pull the two rotating wheels 701 to rotate in the opposite direction, thereby realizing the opposite rotation of the two rotating drums 601. A support wheel 704 is fixedly connected to the rotating ring 4. The support wheel 704 is located on the axis of symmetry of the two rotating wheels 701. The connecting rope 703 passes around the support wheel 704 and supports the connecting rope 703 on the top of the rotating ring 4, so that the ring body and the tension part can be placed on the placement seat 6.

[0035] Working principle: When the lugs of the rotating roller 404, which are in contact with the tensioning part, move to the edge of the lugs, the distance between the two adjacent connecting shafts 401 gradually increases. At this moment, the connecting rope 703 pulls the two rotating wheels 701 to rotate in opposite directions. At the same time, the sixth elastic element 702 twists, and the rotating wheels 701 drive the adjacent rotating drum 601 to start rotating. The rotating drum 601 drives the two symmetrically distributed sliding grooves 602 on it to rotate synchronously. The two sliding grooves 602 push the locking blocks 603 inside them, causing the two locking blocks 603 to move in opposite directions. The two locking blocks 603 drive the sliding shaft 502 and the slider 504 to move in opposite directions. The sliding shaft 502 passes through... The fourth elastic element 503 pushes the corresponding positioning block 501 to move. The slider 504 drives another positioning block 501 to move in the opposite direction through the fifth elastic element 505. That is, the two positioning blocks 501 move in opposite directions to push the ear piece of the tension part to align with the ring body, reducing the probability of misalignment between the ear piece and the ring body. Then, the rotating drum 601 continues to drive the two sliding grooves 602 on it to rotate. The two locking blocks 603 continue to move in opposite directions to drive the sliding shaft 502 and the slider 504 to move synchronously. At the same time, the fourth elastic element 503 and the fifth elastic element 505 are compressed. This continues until the two rotating rollers 404 move to the edge of the ear piece.

[0036] After the clamp welding is completed, during the process of the connecting rod 7 returning to its initial position, the sixth elastic element 702 returns to its initial position, causing the adjacent rotating wheel 701 to return to its initial position and rotate. The rotating wheel 701 winds up the connecting rope 703, and at the same time drives the rotating drum 601 to return to its initial position. The rotating drum 601 drives the sliding shaft 502 and the slider 504 to return to their initial positions through the sliding groove 602 and the locking block 603. During this period, the fourth elastic element 503 and the fifth elastic element 505 return to their initial positions, and the two positioning blocks 501 separate from the ear pieces. When it is necessary to weld the loose part to the ring body again, the above steps are repeated.

[0037] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. All equivalent substitutions made within the principles of the present invention should be included within the scope of protection of the present invention. Contents not described in detail in this invention are existing technologies known to those skilled in the art.

Claims

1. A spot welding device for clamps, comprising a spot welding machine (1), wherein the spot welding machine (1) is slidably connected to a placement plate (2), and the spot welding machine (1) is fixedly connected to two symmetrically distributed first driving members (3), the telescopic ends of the first driving members (3) being fixedly connected to the placement plate (2), the placement plate (2) being rotatably connected to a rotating ring (4), the placement plate (2) being provided with a driving module (5) for driving the rotating ring (4) to rotate, and the rotating ring (4) being fixedly connected to a placement seat (6), characterized in that, The rotating ring (4) is slidably connected with two connecting rods (7) symmetrically distributed, the connecting rod (7) is fixedly connected with a fixed cylinder (8), the fixed cylinder (8) is slidably connected with a pressing piece (9) in the sealed state, the pressing piece (9) is used for pressing the ear piece of the corresponding tight part, the first elastic piece (10) is arranged between the fixed cylinder (8) and the pressing piece (9), the rotating ring (4) is provided with a pulling assembly for driving the two connecting rods (7) to move, and the placing seat (6) is provided with a fixing assembly for fixing the hoop pin.

2. A spot welding device for a clamp as defined in claim 1, characterized in that The pulling assembly comprises two second elastic pieces (201) symmetrically distributed, two second elastic pieces (201) correspond to two connecting rods (7), the second elastic piece (201) is fixedly connected between the corresponding connecting rod (7) and the rotating ring (4), the rotating ring (4) is rotatably connected with a gear ring (202), the connecting rod (7) and the gear ring (202) are fixedly connected with a pull rope (203), the placing plate (2) is fixedly connected with a second driving piece (204), the output shaft of the second driving piece (204) is fixedly connected with a transmission gear (205), and the gear ring (202) is engaged with the transmission gear (205).

3. A spot welding device for a clamp as defined in claim 1, characterized in that The fixing assembly comprises two elastic push rods (301) symmetrically distributed, and the two elastic push rods (301) are fixedly connected on the placing seat (6), the rotating ring (4) is fixedly connected with two protrusions (302) symmetrically distributed, and the central axis of the elastic push rod (301) coincides with the central axis of the corresponding protrusion (302).

4. The spot welding device for a clamp as defined in claim 1, wherein The pressing piece (9) is composed of a connecting shaft (401), a piston plate (402), a third elastic piece (403) and a rotating roller (404), the connecting shaft (401) and the piston plate (402) are both in sealed sliding connection with the corresponding fixed cylinder (8), the piston plate (402) is located between the connecting shaft (401) and the corresponding fixed cylinder (8), the third elastic piece (403) is fixedly connected between the connecting shaft (401) and the piston plate (402), the rotating roller (404) is rotatably connected with the connecting shaft (401), and the first elastic piece (10) is located between the fixed cylinder (8) and the piston plate (402).

5. A spot welding device for a clamp as defined in claim 4, characterized in that The connecting shaft (401) is slidably connected with two positioning blocks (501) symmetrically distributed, and the two positioning blocks (501) are located on both sides of the rotating roller (404) respectively.

6. A spot welding device for a clamp as defined in claim 5, characterized in that One of the positioning blocks (501) on the same connecting shaft (401) is slidably connected with a sliding shaft (502), and the fourth elastic piece (503) is arranged between the sliding shaft (502) and the positioning block (501).

7. A spot welding device for a clamp as defined in claim 6, characterized in that Another positioning block (501) on the same connecting shaft (401) is in sliding connection with the sliding shaft (502), the sliding shaft (502) is in sliding connection with a sliding block (504), and the sliding block (504) is provided with a fifth elastic element (505) between the sliding block (504) and the positioning block (501).

8. A spot welding device for a clamp as defined in claim 7, characterized in that The connecting shaft (401) is rotatably connected with a rotating drum (601), the rotating drum (601) is provided with two symmetrical sliding grooves (602), and the sliding shaft (502) and the sliding block (504) are fixedly connected with clamping blocks (603), and the two clamping blocks (603) are located in the corresponding sliding grooves (602) and slide.

9. A spot welding device for a clamp as defined in claim 8, characterized in that The connecting shaft (401) is rotatably connected with a rotating drum (601), the rotating drum (601) is provided with two symmetrical sliding grooves (602), and the sliding shaft (502) and the sliding block (504) are fixedly connected with clamping blocks (603), and the two clamping blocks (603) are located in the corresponding sliding grooves (602) and slide.

10. A spot welding device for a clamp as defined in claim 9, characterized in that The connecting shaft (401) is rotatably connected with a rotating drum (601), the rotating drum (601) is provided with two symmetrical sliding grooves (602), and the sliding shaft (502) and the sliding block (504) are fixedly connected with clamping blocks (603), and the two clamping blocks (603) are located in the corresponding sliding grooves (602) and slide. The rotating ring (4) is fixedly connected with a supporting wheel (704), the supporting wheel (704) is located on the symmetrical axis of the two rotating wheels (701), and the connecting rope (703) passes through the supporting wheel (704).

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