Spot welding head for double-sided welding

Abstract

The utility model relates to a spot welding head for double-sided welding, which comprises a connecting seat capable of being connected with a mechanical arm, and a deflection mechanism capable of adjustably driving a spot welding gun body to perform arc rotation is arranged on the bottom surface of the connecting seat. The axial lower end, away from the connecting base, of the deflection mechanism is connected with a transverse movement positioning assembly capable of driving the spot welding gun body to synchronously move on the upper side and the lower side of the thick workpiece. The transverse moving positioning assembly is matched with the deflection mechanism to change the working position of the spot welding gun body according to the mode that the transverse moving positioning assembly drives the spot welding gun body to translate while deflecting along with the deflection mechanism, so that a curve welding path is defined; the spot welding gun body is connected with the transverse moving positioning assembly through a telescopic rod. According to the utility model, the welding treatment of a thick workpiece can be efficiently completed in a double-sided synchronous welding processing mode while continuous multi-point welding processing is carried out on a curve welding seam.

Description

Technical Field

[0001] This utility model relates to the field of welding equipment technology, and in particular to a spot welding head for double-sided welding. Background Technology

[0002] Spot welding is a crucial part of modern industrial manufacturing. It typically refers to a welding method that uses a cylindrical electrode to form a weld point on the contact surface of two overlapping workpieces. During spot welding, the contact surfaces of the two workpieces are first pressed together, then an electric current is applied. The resistance heat generated by the current passing through the contact surface and adjacent areas causes the two workpieces to melt, bond, and then cool and solidify. Currently, in batch continuous welding processes, multi-point spot welding is commonly performed by moving the welding machine while the workpiece is positioned by a fixture. This method is widely used in the production and processing of large equipment such as automobiles.

[0003] However, existing spot welding equipment cannot effectively adapt to non-linear welds, nor can it accurately perform continuous multi-point welding on curved or other non-linear welds. Its welding adaptability is poor and it cannot meet the increasingly complex welding processing requirements. In addition, existing spot welding equipment is usually a single welding torch structure. When welding thick plate workpieces, it requires two welding cycles to complete the welding processing of the front and back of the workpiece respectively. It cannot weld both sides of the thick plate workpiece at the same time, resulting in low welding efficiency and easy deviation of the welding points on both sides. Utility Model Content

[0004] The purpose of this utility model is to provide a double-sided welding head that can efficiently complete the welding of thick workpieces by performing continuous multi-point welding on curved welds and simultaneously performing double-sided synchronous welding. This solves the problems that existing spot welding equipment cannot effectively adapt to non-linear welds, cannot effectively perform multi-point welding on increasingly complex welds, and cannot simultaneously weld the front and back sides of the workpiece, thus failing to efficiently complete the double-sided welding of thick workpieces.

[0005] The technical solution adopted in this utility model is as follows: a spot welding head for double-sided welding, including a connecting seat that can be connected to a robotic arm. A deflection mechanism that can adjustably drive the spot welding gun body to rotate in an arc is provided on the bottom surface of the connecting seat. A transverse positioning component that can drive the spot welding gun body to move synchronously on the upper and lower sides of a thick workpiece is connected to the axial lower end of the deflection mechanism away from the connecting seat. The transverse positioning component cooperates with the deflection mechanism to change the working position of the spot welding gun body in a manner that it drives the spot welding gun body to move in a translation while following the deflection mechanism to deflect, so as to define a curved welding path. The spot welding gun body is connected to the transverse positioning component through a telescopic rod.

[0006] According to a preferred embodiment, the lateral positioning assembly includes a main housing, a lateral plate assembly, a drive mechanism, and a balancing mechanism. The main housing is mounted on the lower axial end of the deflection mechanism, and the lateral plate assembly and the balancing mechanism, which are capable of being driven by the lateral plate assembly, are slidably disposed within the main housing. The drive mechanism, capable of driving the lateral plate assembly to perform reciprocating translation, is also embedded within the main housing.

[0007] According to a preferred embodiment, the first and second plates of the transverse plate assembly are arranged in parallel on the main housing, and transmission teeth are provided on the facing surfaces of the first and second plates. The spot welding gun bodies are installed on the facing ends of the first and second plates via the telescopic rod, thereby defining the relative working positions of the two spot welding gun bodies, which are aligned and coaxially arranged, so that the two spot welding gun bodies can simultaneously press against both sides of the weld seam of the thick workpiece under the drive of the telescopic rod.

[0008] According to a preferred embodiment, the drive mechanism includes a drive gear and a transmission gear rotatably inserted into the cavity of the main housing, and the drive gear and the transmission gear are in transmission engagement; the side of the drive gear away from the transmission gear engages with the transmission rack teeth laid on the first strip, and the side of the transmission gear away from the drive gear engages with the transmission rack teeth laid on the second strip; the drive gear is also in transmission connection with a drive motor mounted on the outer wall of the main housing.

[0009] According to a preferred embodiment, through slots are provided on the two parallel shell walls of the main housing to accommodate the first and second plates of the transverse plate assembly; an insulating partition is also provided on the side of the main housing facing the spot welding gun body.

[0010] According to a preferred embodiment, the ends of the first plate and the second plate away from the telescopic rod are connected by a connecting vertical plate; a guide slide rod penetrating the main housing is also provided on the connecting vertical plate.

[0011] According to a preferred embodiment, the surface of the second plate away from the transmission rack is further provided with a strip-shaped tooth groove, and the strip-shaped tooth groove can engage with the balancing mechanism in transmission.

[0012] According to a preferred embodiment, the balancing mechanism includes a rotating gear disk, a slide rail, a pull rope, a pulley, a slider, and a balance block. The rotating gear disk is rotatably inserted into the main housing and can mesh with the strip-shaped toothed groove for transmission. The pull rope is wound around the shaft of the rotating gear disk. The slide rail is mounted on the outer wall of the main housing, and the slider is slidably mounted in its groove. The pulley is also provided at the end of the slide rail away from the main housing. One end of the pull rope away from the rotating gear disk passes through the pulley and connects to the slider. The slider is also connected to the balance block located outside the slide rail.

[0013] According to a preferred embodiment, the surface of the slider is further provided with a limiting spring that is connected to the outer wall surface of the main housing.

[0014] According to a preferred embodiment, the rotating gear disk is composed of a central rotating shaft and two parallel disk bodies.

[0015] The beneficial effects of this utility model are:

[0016] The deflection mechanism and lateral positioning component of this application work together to position the spot welding gun body at any point within a certain plane by driving it to rotate synchronously in an arc and translate laterally. This facilitates defining non-linear motion paths such as curves, enabling intermittent spot welding of complex weld seams. It ensures the accuracy and effectiveness of multi-point, equidistant welding, guarantees the precision and adjustability of welding positioning, and meets the increasingly complex spot welding requirements. The lateral positioning component of this application can construct two opposing support stations, allowing two aligned spot welding gun bodies to move synchronously above and below the thick workpiece. This enables efficient double-sided welding of thick workpieces, allowing simultaneous welding on both sides, significantly reducing the welding cycle length, improving welding efficiency, ensuring the equiposition of welding points on both sides, and improving welding quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a preferred double-sided welding spot welding head proposed in this utility model;

[0018] Figure 2 This is a cross-sectional view of a preferred transverse positioning component for a double-sided welding spot welding head proposed in this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of a preferred double-sided welding spot welding head transverse positioning component when extended, as proposed in this utility model;

[0020] Figure 4This is a side plan view of the main housing of a preferred double-sided welding spot welding head proposed in this utility model;

[0021] Figure 5 This is a schematic diagram of the rotating gear disk of a preferred double-sided welding spot welding head proposed in this utility model.

[0022] List of reference numerals

[0023] 1: Connecting seat; 2: Deflection mechanism; 3: Lateral positioning assembly; 4: Spot welding gun body; 5: Telescopic rod; 31: Main housing; 32: Lateral plate assembly; 33: Drive mechanism; 34: Balancing mechanism; 311: Through slot; 312: Insulating partition; 321: First plate; 322: Second plate; 323: Transmission rack; 324: Connecting vertical plate; 325: Guide slide rod; 326: Strip toothed groove; 331: Drive gear; 332: Transmission gear; 333: Drive motor; 341: Rotating gear disc; 342: Slide rail; 343: Pull rope; 344: Pulley; 345: Slider; 346: Balance block; 347: Limiting spring; 3411: Central rotating shaft; 3412: Disc body. Detailed Implementation

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] The technical solutions provided by this utility model will be described in detail below with reference to the accompanying drawings and through embodiments. It should be noted that the descriptions of these embodiments are intended to aid in understanding this utility model, but do not constitute a limitation thereof. In some examples, because some implementation methods belong to existing or conventional technology, they are not described or are not described in detail.

[0026] Furthermore, the technical features described herein, or the steps in all the methods or processes disclosed herein, may be combined in any suitable manner in one or more embodiments, except for mutually exclusive features and / or steps. It will be readily understood by those skilled in the art that the order of steps or operations of the methods relating to the embodiments provided herein may also be altered. Any order in the drawings and embodiments is for illustrative purposes only and does not imply a requirement to follow a particular order unless explicitly stated otherwise.

[0027] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, under reasonable circumstances (without self-contradiction), include both direct and indirect connections (linkages).

[0028] The following is a detailed explanation with reference to the accompanying drawings.

[0029] Example 1

[0030] This application provides a spot welding head for double-sided welding, which includes a connecting seat 1, a deflection mechanism 2, a transverse positioning component 3, a spot welding gun body 4, and a telescopic rod 5.

[0031] according to Figure 1-5 In one specific embodiment, the connecting base 1 can be connected to a production line suspension mechanism or support mechanism such as an industrial robotic arm. A deflection mechanism 2 is provided on the bottom surface of the connecting base 1, capable of adjusting the rotation of the spot welding gun body 4 in an arc. A transverse positioning component 3 is connected to the lower axial end of the deflection mechanism 2 away from the connecting base 1, capable of synchronously translating the spot welding gun body 4 on the upper and lower sides of a thick workpiece. The transverse positioning component 3, in coordination with the deflection mechanism 2, changes the working position of the spot welding gun body 4 by simultaneously deflecting and translating it, thereby defining a curved welding path. The spot welding gun body 4 is connected to the transverse positioning component 3 via a telescopic rod 5. The deflection mechanism 2 and the lateral positioning component 3 of this application work together to position the spot welding gun body 4 at any point within a certain plane by synchronously driving the spot welding gun body 4 to rotate in an arc and translate laterally. This facilitates defining non-linear motion paths such as curves, enabling intermittent spot welding of welds with complex paths. It ensures the accuracy and effectiveness of multi-point, equidistant welding, guarantees the precision and adjustability of welding positioning, and meets the increasingly complex spot welding requirements. The lateral positioning component 3 of this application can construct two opposing support positions, allowing the two aligned spot welding gun bodies 4 to move synchronously, suspended above and below the thick workpiece. This enables efficient double-sided welding of thick workpieces, allowing simultaneous welding on both sides, significantly reducing the welding cycle length, improving welding efficiency, ensuring the equiposition of welding points on both sides, and improving welding quality. The telescopic rod 5 provided in this application can adjust the distance between the spot welding gun body 4 and the thick workpiece as needed, so that the spot welding gun body 4 can accurately weld the weld seam at a specific point.

[0032] Preferably, the transverse positioning assembly 3 includes a main housing 31, a transverse plate assembly 32, a drive mechanism 33, and a balancing mechanism 34. Preferably, the main housing 31 is mounted on the lower axial end of the deflection mechanism 2. More preferably, the transverse plate assembly 32 and the balancing mechanism 34, which can be driven and connected to the transverse plate assembly, are slidably disposed within the main housing 31. Preferably, a drive mechanism 33 capable of driving the transverse plate assembly 32 to reciprocate is also embedded within the main housing 31. The drive mechanism 33 provided in this application can drive the transverse plate assembly 32 to transversely move as needed, thereby moving the spot welding gun body 4 located on one side of the thick workpiece to above and below the thick workpiece, thus facilitating the spot welding gun body 4 to simultaneously weld the upper and lower end faces of the weld seam on the thick workpiece. The translation of the transverse plate assembly 32 can change the working position of the spot welding gun body 4. The balancing mechanism 34 provided in this application can move synchronously in the opposite direction to the transverse plate assembly 32, thereby maintaining the stability of the center of gravity and the balance of the main shell 31, and reducing the risk of the transverse positioning assembly 3 tilting or tipping over. The balancing mechanism 34 is synchronously driven by the transverse plate assembly 32 when the transverse plate assembly 32 moves, so that the coordinated and opposite movements of the two can effectively ensure the stability of the main structure.

[0033] Preferably, through slots 311 are formed on the two parallel shell walls of the main housing 31 to accommodate the first plate 321 and the second plate 322 of the transverse sliding plate assembly 32. More preferably, an insulating partition 312 is also provided on the side of the main housing 31 facing the spot welding gun body 4. The through slots 311 provided in this application can limit the sliding direction of the first plate 321 and the second plate 322, facilitating the directional extension and retraction of the first plate 321 and the second plate 322. The insulating partition 312 provided in this application can prevent electrical conductivity when the equipment comes into contact with the edge of a energized thick workpiece, thus preventing electrical failures and other problems.

[0034] Preferably, the first plate 321 and the second plate 322 of the transverse plate assembly 32 are arranged in parallel on the main housing 31. More preferably, transmission rack teeth 323 are provided on the facing plate surfaces of the first plate 321 and the second plate 322. Preferably, spot welding gun bodies 4 are installed on the facing plate surfaces of the first plate 321 and the second plate 322 via telescopic rods 5 to define the relative working positions of the two spot welding gun bodies 4, which are aligned and coaxially arranged, so that the two spot welding gun bodies 4 can simultaneously press against both sides of the weld seam of the thick workpiece under the drive of the telescopic rods 5. Preferably, the ends of the first plate 321 and the second plate 322 away from the telescopic rods 5 are connected by a connecting vertical plate 324 to help limit the synchronous movement of the first plate 321 and the second plate 322. Preferably, a guide slide rod 325 penetrating the main housing 31 is also provided on the connecting vertical plate 324. Preferably, the surface of the second plate 322 away from the drive rack 323 is also provided with a strip-shaped groove 326. Specifically, the strip-shaped groove 326 can engage with the balancing mechanism 34 to drive the balancing mechanism 34 to move synchronously with the second plate 322. The first plate 321 and the second plate 322 provided in this application can be aligned with two spot welding gun bodies 4, so that the two spot welding gun bodies 4 can move simultaneously with the first plate 321 and the second plate 322 to the upper and lower sides of the weld, so as to perform double-sided welding on the weld at the same time, thereby improving the welding effect and efficiency of thick workpieces. The first plate 321 and the second plate 322 can be translated by the meshing transmission of the drive rack 323 and the drive mechanism 33, so that the first plate 321 and the second plate 322 located at the edge of the thick workpiece can extend to the upper and lower sides of the thick workpiece, thereby facilitating the positioning of the lateral relative position between the spot welding gun body 4 and the weld. This application also connects the first plate 321 and the second plate 322 by setting a connecting vertical plate 324 to ensure the synchronous movement of the first plate 321 and the second plate 322 and avoid displacement misalignment. The guide slide rod 325 provided in this application can help limit the movement direction and stability of the first plate 321 and the second plate 322, thereby ensuring the positioning accuracy of the spot welding gun body 4. The strip toothed groove 326 provided in this application can drive the balancing mechanism 34 to move synchronously with the second plate 322 to ensure the linkage and equivalence of the movement of the two.

[0035] Preferably, the drive mechanism 33 includes a drive gear 331 and a transmission gear 332 rotatably inserted into the cavity of the main housing 31. Specifically, the drive gear 331 and the transmission gear 332 are in transmission engagement. Preferably, the side of the drive gear 331 away from the transmission gear 332 meshes with a transmission rack tooth 323 laid on the first plate 321. Preferably, the side of the transmission gear 332 away from the drive gear 331 meshes with a transmission rack tooth 323 laid on the second plate 322. Preferably, the spindle of the drive gear 331 is also connected to a drive motor 333 mounted on the outer wall of the main housing 31. Specifically, driven by the drive motor 333, the drive gear 331 and the transmission gear 332 rotate simultaneously, thereby driving the first plate 321 and the second plate 322 to translate synchronously. The meshing transmission and rotational drive of the drive gear 331 and transmission gear 332 provided in this application enable the first plate 321 and the second plate 322, which mesh with the drive gear 331 and transmission gear 332 respectively and are parallel to each other, to translate in the same direction and at the same distance. This ensures the synchronicity of their movements and the coaxial accuracy of their positioning, so as to simultaneously perform welding processing on the coaxial points on the upper and lower surfaces of the thick workpiece, ensuring accurate welding positioning and welding efficiency.

[0036] Preferably, the balancing mechanism 34 includes a rotating gear 341, a slide rail 342, a pull rope 343, a pulley 344, a slider 345, and a balance block 346. Preferably, the rotating gear 341 is rotatably inserted into the main housing 31 and can engage with the strip toothed groove 326 for transmission. Preferably, a pull rope 343 is also wound around the shaft of the rotating gear 341. Preferably, the slide rail 342 is mounted on the outer wall of the main housing 31, and a slider 345 is slidably mounted in its groove. More preferably, a pulley 344 is also provided at the end of the slide rail 342 away from the main housing 31. Preferably, one end of the pull rope 343 away from the rotating gear 341 passes through the pulley 344 and is connected to the slider 345. Preferably, the slider 345 is also connected to a balance block 346 located outside the slide rail 342. Preferably, the surface of the slider 345 is also provided with a limiting spring 347 connected to the outer wall of the main housing 31, so that the limiting spring 347 cooperates with the pull rope 343 to limit the working position of the slider 345 on the slide rail 342. The balancing mechanism 34 provided in this application can move laterally in the opposite direction to the lateral movement of the first plate 321 and the second plate 322, thereby ensuring the balance of forces on both sides by synchronously increasing weight, avoiding the disadvantages such as the risk of tilting due to excessive gravity on one side, and ensuring the stability of the overall structure. When the first plate 321 and the second plate 322 extend, the pull rope gradually winds onto the rotating gear 341 as the rotating gear 341 rotates, thereby pulling the slider 345 and the balance block 346 away from the main housing 31, so that the forces on both sides of the main housing 31 are balanced. When the first plate 321 and the second plate 322 retract, the rotating gear 341 rotates in the opposite direction to release the pull rope, so that the slider 345 can be reset and translated by the restoring force of the elongated limit spring 347 and move closer to the main housing 31 to ensure the balance of forces.

[0037] Preferably, the rotating gear disc 341 is composed of a central rotating shaft 3411 and two parallel discs 3412. Specifically, the pull rope 343 can be adjusted and wound onto the shaft of the central rotating shaft 3411 located between the two discs 3412. The two discs 3412 provided in this application can limit the position of the pull rope 343 winding, avoiding problems such as the pull rope 343 becoming tangled during winding. The two parallel discs 3412 can ensure the stability of the meshing transmission and avoid problems such as tooth slippage.

[0038] Preferably, the spot welding gun body 4 used in this application is an existing conventional spot welding equipment, requiring no additional structural design or modification. The telescopic rod 5 provided in this application is a hydraulic rod, which can periodically rise and fall as needed to press the spot welding gun body 4 against the weld position defined by the thick workpiece, thereby facilitating the generation of resistance heat when the spot welding gun body 4 comes into contact with the pre-energized thick workpiece to achieve weld welding.

[0039] This utility model is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this utility model. However, regardless of any changes in shape or structure, any technical solution falling within the scope of the claims of this utility model is within the protection scope of this utility model. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and do not constitute a limitation on the claims. The protection scope of this utility model is defined by the claims and their equivalents. Throughout the text, features introduced by "preferred" are merely optional and should not be construed as mandatory. Therefore, the applicant reserves the right to abandon or delete relevant preferred features at any time.

Claims

1. A spot welding head for double-sided welding, comprising a connecting seat (1) capable of being connected with a mechanical arm, characterized in that a deflection mechanism (2) capable of adjustably driving a spot welding gun body (4) to rotate in an arc is arranged on the bottom surface of the connecting seat (1), the deflection mechanism (2) is connected with a horizontal displacement positioning assembly (3) capable of driving the spot welding gun body (4) to synchronously translate on the upper and lower sides of a thick workpiece at the axial lower end of the connecting seat (1) away from the connecting seat (1), the horizontal displacement positioning assembly (3) changes the working position of the spot welding gun body (4) in cooperation with the deflection mechanism (2) according to the way that it drives the spot welding gun body (4) to translate while following the deflection of the deflection mechanism (2), so as to define a curved welding path; the spot welding gun body (4) is connected with the horizontal displacement positioning assembly (3) through a telescopic rod (5). the horizontal displacement positioning assembly (3) comprises a main housing (31), a horizontal displacement plate group (32), a driving mechanism (33) and a balancing mechanism (34), wherein 2. The spot welding head for double-sided welding of claim 1, wherein the main housing (31) is installed at the axial lower end of the deflection mechanism (2), and the main housing (31) is slidably penetrated by the horizontal displacement plate group (32) and the balancing mechanism (34) capable of being drivingly connected with the horizontal displacement plate group (32); the driving mechanism (33) capable of driving the horizontal displacement plate group (32) to reciprocatingly translate is also embedded in the main housing (31). the first plate (321) and the second plate (322) of the horizontal displacement plate group (32) are arranged in parallel on the main housing (31), and a transmission strip gear (323) is arranged on the plate surface of the first plate (321) and the second plate (322) facing each other, 3. The spot welding head for double-sided welding of claim 2, wherein the spot welding gun body (4) is installed on the end of the plate surface of the first plate (321) and the second plate (322) facing each other through the telescopic rod (5), so as to define the relative working position of the two spot welding gun bodies (4) arranged in alignment and coaxially, so that the two spot welding gun bodies (4) can be simultaneously pressed on the two sides of the weld of the thick workpiece under the driving of the telescopic rod (5). the driving mechanism (33) comprises a driving gear (331) and a transmission gear (332) rotatably inserted in the cavity of the main housing (31), and the driving gear (331) and the transmission gear (332) are drivingly engaged; 4. The spot welding head for double-sided welding of claim 3, wherein the side of the driving gear (331) away from the transmission gear (332) is engaged with the transmission strip gear (323) arranged on the first plate (321), the side of the transmission gear (332) away from the driving gear (331) is engaged with the transmission strip gear (323) arranged on the second plate (322); the driving gear (331) is further drivingly connected with a driving motor (333) installed on the outer side wall of the main housing (31). through grooves (311) capable of accommodating the first plate (321) and the second plate (322) of the horizontal displacement plate group (32) are formed on the two parallel shell walls of the main housing (31).

5. The spot welding head for double-sided welding of claim 4, wherein ​ The main shell (31) is also provided with an insulating partition plate (312) on the side facing the spot welding gun body (4).

6. The spot welding head for double-sided welding of claim 5, wherein The first strip plate (321) and the second strip plate (322) are connected by a connecting vertical plate (324) at the end away from the telescopic rod (5). The connecting vertical plate (324) is also provided with a guide sliding rod (325) penetrating through the main shell (31).

7. The spot welding head for double-sided welding of claim 6, wherein The second strip plate (322) is also provided with a strip-shaped tooth groove (326) on the plate surface away from the transmission strip tooth (323), and the strip-shaped tooth groove (326) can be in transmission engagement with the balancing mechanism (34).

8. The spot welding head for double-sided welding of claim 7, wherein The balancing mechanism (34) comprises a rotating tooth disc (341), a sliding rail (342), a pull rope (343), a pulley (344), a sliding block (345) and a balancing block (346), wherein, The rotating tooth disc (341) is rotatably inserted into the main shell (31) and can be in engagement transmission with the strip-shaped tooth groove (326), The pull rope (343) is also coiled on the shaft rod of the rotating tooth disc (341); The sliding rail (342) is installed on the outer side wall of the main shell (31), and the sliding block (345) is slidingly installed in the rail groove of the sliding rail (342), and the sliding rail (342) is also provided with the pulley (344) at the rail groove end away from the main shell (31); The end of the pull rope (343) away from the rotating tooth disc (341) passes through the pulley (344) and is connected with the sliding block (345); The sliding block (345) is also connected with the balancing block (346) outside the sliding rail (342).

9. The spot welding head for double-sided welding of claim 8, wherein, The surface of the sliding block (345) is also provided with a limiting spring (347) connected with the outer wall surface of the main shell (31).

10. The spot welding head for double-sided welding of claim 9, wherein, The rotating tooth disc (341) is composed of a central rotating shaft (3411) and two parallel disc bodies (3412).

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