A clamping mechanism for laser welding of metal fittings of electrical appliances

Abstract

The application relates to the technical field of laser welding, in particular to a clamping mechanism for laser welding of electric metal fittings, which comprises an upper clamping plate, a lower clamping plate connected with the upper clamping plate through a plurality of connecting screws, a servo motor installed at a middle position of one side of the lower clamping plate away from the upper clamping plate, two clamping heads, I-shaped rails installed at one end of the two clamping heads, the I-shaped rails being rotatably installed between the upper clamping plate and the lower clamping plate, a plurality of gear teeth uniformly installed on one side of the I-shaped rails away from the clamping heads, a slot formed at a position of one side of the I-shaped rail close to the clamping head, and a shielding piece matched with the slot to form a plug-in relationship for plugging the gap between the upper clamping plate and the lower clamping plate. The length of the shielding plate covers and exceeds the range of the clamping plate, the shielding strip is tightly contacted with the upper clamping plate, a first protective barrier is formed, the welding slag and metal dust generated in the laser welding process are prevented from entering the gear transmission area, the gear meshing is prevented from being blocked or stuck, and the opening and closing action of the clamping head driven by the servo motor is ensured to be accurate and smooth.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser welding, in particular to a clamping mechanism for laser welding of electric appliance metal fittings. BACKGROUND

[0002] Laser welding technology uses high-energy-density laser beams to precisely focus on the welding area of electric appliance metal fittings, so that the material at this part reaches a molten state in an instant and forms a molten pool, and after the molten pool cools down, solid-state connection between the fittings is achieved. In this process, in order to ensure the precision of the welding position, the electric appliance metal fittings must be stably clamped and positioned.

[0003] It is a common clamping method in laser welding of electric appliance metal fittings that two clamps are driven to approach or move away from each other by a servo motor through gear transmission. Specifically, a plurality of gears driven by the servo motor are rotatably installed between two oppositely arranged clamping plates through shaft bodies, the gears are meshed with each other to form a linkage transmission structure, and then the clamps connected to the gears complete the opening and closing action. Since the clamps need to move with the gears, there must be an open gap between the ends of the two clamping plates facing the clamps, which provides the necessary space for the expansion and contraction of the clamps.

[0004] In the laser welding process, the high-temperature molten metal produces welding slag, and may also produce dust and other impurities condensed from metal vapor. These impurities can easily enter the internal gear transmission area through the open gap between the clamping plates, and once attached to the tooth surface or meshing part of the gear, it will cause the meshing between the gears to be blocked, which may cause the clamps to move and position inaccurately, or even cause the gears to jam and the servo motor to overload, directly affecting the normal use of the clamping device, and even causing welding defects due to the mispositioning of the fittings, affecting the welding quality of the electric appliance metal fittings. SUMMARY

[0005] To solve the above problems, a clamping mechanism for laser welding of electric appliance metal fittings is provided to solve the problem that in the laser welding process, high-temperature molten metal produces welding slag, and may also produce dust and other impurities condensed from metal vapor, which easily enter the internal gear transmission area through the open gap between the clamping plates.

[0006] To solve the problems in the prior art, the present application provides a clamping mechanism for laser welding of electric appliance metal fittings.

[0007] As a technical solution of the present application, a clamping mechanism for laser welding of electric appliance metal fittings comprises:

[0008] an upper clamping plate;

[0009] The lower clamping plate is located below the upper clamping plate and is arranged parallel to the upper clamping plate. The lower clamping plate is connected to the upper clamping plate by multiple connecting screws.

[0010] A servo motor is installed in the middle of the side of the lower clamping plate opposite to the upper clamping plate. The output shaft of the servo motor extends between the lower and upper clamping plates and is equipped with a power gear. Two driven gears are rotatably installed between the lower and upper clamping plates. An intermediate gear is rotatably installed between the upper and lower clamping plates. The intermediate gear meshes with a driven gear and a power gear. The driven gear that does not mesh with the intermediate gear meshes with the power gear.

[0011] The chuck has two chucks, and each of the two chucks has an I-beam rail installed at one end close to the other. The I-beam rail is rotatably installed between the upper and lower clamping plates. Multiple gear teeth are evenly installed on the side of the I-beam rail away from the chuck. The gear teeth mesh with the driven gear. A slot is opened on one side of the I-beam rail near the chuck. The slot has a U-shaped cross-section.

[0012] The shielding component, which mates with the slot to form a plug-in relationship, is used to seal the gap between the upper and lower clamping plates.

[0013] Furthermore, the shielding member includes:

[0014] A baffle plate is inserted into the channel formed by the slots in the two I-beam rails, and the length of the baffle plate is greater than the length of the upper clamping plate and the lower clamping plate.

[0015] A shielding strip is installed at one end of the shielding plate located outside the slot, and the shielding strip is in contact with the surface of the upper clamping plate;

[0016] Two sets of connectors are provided, and the connectors are installed between the shielding strip and the upper clamping plate.

[0017] Furthermore, the connector includes a side baffle, and both ends of the shielding strip are equipped with side baffles. One end of the side baffle is in contact with the upper clamping plate, and the side baffle is connected and fixed to the upper clamping plate by a limiting screw.

[0018] Furthermore, a pad is provided between the upper clamping plate and the lower clamping plate. The pad is located on the side of the upper clamping plate away from the clamping head. The upper clamping plate has two rows of first through holes at the end away from the clamping head. The pad has a second through hole on one side that is aligned with the first through holes. The lower clamping plate has two rows of screw holes on one side that mate with the first through holes. The limiting screw passes through the channel formed by the first through holes and the second through holes and is threaded into the screw hole.

[0019] Further, the upper clamping plate is recessed on the side away from the lower clamping plate to form a groove, the groove is communicated with the first through hole, two L-shaped plates are inserted into the groove, a third through hole is formed on one side of the L-shaped plate and aligned with the first through hole, and the limiting screw penetrates through the third through hole.

[0020] Further, the L-shaped plate is fixedly connected with a connecting strip at one end close to the side baffle, and the connecting strip is integrally formed with the L-shaped plate.

[0021] Further, a plurality of first slits are formed on the two parallel inner walls in the insertion groove, the first slits are arranged along the length direction of the I-shaped rail, a plurality of second slits are formed on the two parallel sides of the shielding plate, and the second slits are arranged along the length direction of the shielding plate.

[0022] Further, a third slit is formed at a lower position in the insertion groove, a pulling plate is inserted into the third slit, the pulling plate is fixedly connected with the shielding plate, and a plurality of waist-shaped holes are equidistantly formed on one side of the pulling plate.

[0023] Further, an upper protruding portion is installed at one end of the upper clamping plate close to the I-shaped rail, the upper protruding portion is integrally formed with the upper clamping plate, a lower protruding portion is installed at one end of the lower clamping plate close to the I-shaped rail, the lower protruding portion is integrally formed with the lower clamping plate, and the lower protruding portion and the upper protruding portion are inserted into the I-shaped rail and in sliding contact with the I-shaped rail.

[0024] Further, a plurality of threaded sleeves are installed on the side of the lower clamping plate facing the upper clamping plate, and the connecting screw is threadedly connected in the threaded sleeve after penetrating through the upper clamping plate.

[0025] The beneficial effects of the present application compared with the prior art are:

[0026] 1. The shielding plate is inserted into the insertion groove of the I-shaped rail and directly blocks the open gap between the upper clamping plate and the lower clamping plate. The length of the shielding plate covers and exceeds the range of the clamping plate, and the shielding plate is in close contact with the upper clamping plate to form a first protective barrier, which prevents welding slag and metal dust generated during laser welding from entering the gear transmission area, avoids blocking or jamming of the gear engagement, and ensures precise and smooth opening and closing of the clamping head driven by the servo motor.

[0027] 2. When the I-shaped rail moves with the clamping head, the shielding plate is always inserted into the insertion groove and can slide synchronously, which does not affect the normal opening and closing of the clamping head and can continuously maintain a sealed state, solving the contradiction that the intermediate gap is necessary for the movement of the clamping head but is easy to enter foreign matters in the traditional structure.

[0028] 3. The servo motor drives the gear teeth on the I-shaped rail through the multi-stage meshing of the power gear, intermediate gear and driven gear, realizing the synchronous reverse movement of the two clamps, ensuring uniform clamping force and symmetrical position, and avoiding the influence of the offset of the parts on the alignment of the welding points. The upper protrusion and the lower protrusion are embedded in the I-shaped rail to provide guidance for its sliding and prevent the clamp from tilting when moving; the rigid structure of the I-shaped rail cooperates with the precise meshing of the gear teeth and the driven gear to make the clamp positioning more accurate, meeting the strict requirements of laser welding of electrical metal parts on clamping tolerance.

[0029] 4. The easily-worn parts such as the shielding plate and the side plate can be individually disassembled and replaced without replacing the entire clamping mechanism, reducing the cost of consumables; at the same time, the isolation protection of the gear and the I-shaped rail prolongs the service life of the transmission components and reduces the equipment failure rate.

[0030] 5. The spacer is installed between the upper clamp plate and the lower clamp plate, and then the spacer and the threaded sleeve jointly support the upper clamp plate and the lower clamp plate, improving the stability of the structure. After the limiting screw is screwed into the threaded hole through the channel formed by the third perforation, the first perforation and the second perforation, the spacer, the side plate, the lower clamp plate and the upper clamp plate are simultaneously limited by the limiting screw, reducing the number of fasteners used, and the side plate further increases the range of shielding welding slag and other debris.

[0031] 6. The first slot is processed in the slot, and the second slot is processed on the shielding plate, thereby reducing the contact area between the inner wall of the slot and the shielding plate, thereby reducing the frictional resistance, and the pulling plate is inserted into the third slot, so that the pulling plate and the third slot cooperate with each other to further improve the stability of the structure. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a perspective view of a clamping mechanism for laser welding of electrical metal parts.

[0033] Figure 2 It is a perspective view of a clamping mechanism for laser welding of electrical metal parts.

[0034] Figure 3 It is Figure 2 the enlarged view of A in FIG.

[0035] Figure 4 It is an exploded structural diagram of a clamping mechanism for laser welding of electrical metal parts.

[0036] Figure 5 It is Figure 4 the enlarged view of B in FIG.

[0037] Figure 6 It is an assembly diagram of gear teeth, clamps and I-shaped rails in a clamping mechanism for laser welding of electrical metal parts.

[0038] Figure 7 It is an assembly schematic view of side baffle, shielding strip and shielding plate in a clamping mechanism for laser welding of electric appliance metal fittings.

[0039] Figure 8 It is an assembly schematic view of cushion block, lower clamping plate and upper clamping plate in a clamping mechanism for laser welding of electric appliance metal fittings.

[0040] The figure label is:

[0041] 1, lower clamping plate; 11, groove; 12, upper protruding part; 2, lower clamping plate; 21, lower protruding part; 22, threaded sleeve; 3, cushion block; 4, limiting screw; 5, side baffle; 51, L-shaped plate; 52, connecting strip; 6, servo motor; 61, driven gear; 62, power gear; 63, intermediate gear; 7, shielding plate; 71, shielding strip; 72, pulling plate; 8, chuck; 81, I-beam rail; 82, gear tooth; 83, insertion slot; 84, third slot; 9, connecting screw. DETAILED DESCRIPTION

[0042] In order to further understand the features, technical means and specific purposes and functions achieved by the present application, the present application will be described in further detail below in combination with the drawings and specific embodiments.

[0043] Referring to Figures 1-8 As shown in the figure, a clamping mechanism for laser welding of electric appliance metal fittings comprises an upper clamping plate 1, a lower clamping plate 2 arranged on the lower side of the upper clamping plate 1 and arranged in parallel with the upper clamping plate 1, and the lower clamping plate 2 is connected with the upper clamping plate 1 through a plurality of connecting screws 9, wherein one side of the lower clamping plate 2 facing the upper clamping plate 1 is provided with a plurality of threaded sleeves 22, so that the connecting screws 9 are threaded and connected in the threaded sleeves 22 after penetrating the upper clamping plate 1, thereby limiting the relative position of the upper clamping plate 1 and the lower clamping plate 2, and under the support of the threaded sleeves 22, there is a space between the upper clamping plate 1 and the lower clamping plate 2 for installing the driven gear 61 and the like.

[0044] The servo motor 6 is installed in the middle of the back of the lower clamping plate 2 away from the upper clamping plate 1, the output shaft of the servo motor 6 extends to the lower clamping plate 2 and the upper clamping plate 1 and is provided with a power gear 62, two driven gears 61 are rotatably installed between the lower clamping plate 2 and the upper clamping plate 1, an intermediate gear 63 is rotatably installed between the lower clamping plate 2 and the upper clamping plate 1, the intermediate gear 63 is engaged with one of the driven gears 61 and the power gear 62, and the driven gear 61 not engaged with the intermediate gear 63 is engaged with the power gear 62, two clamping heads 8 are provided, and the proximal end of each of the two clamping heads 8 is provided with an I-shaped rail 81, the I-shaped rail 81 is rotatably installed between the upper clamping plate 1 and the lower clamping plate 2, the proximal end of the upper clamping plate 1 near the I-shaped rail 81 is provided with an upper protruding portion 12, the upper protruding portion 12 is integrally formed with the upper clamping plate 1, and the proximal end of the lower clamping plate 2 near the I-shaped rail 81 is provided with a lower protruding portion 21, the lower protruding portion 21 is integrally formed with the lower clamping plate 2, so that the lower protruding portion 21 and the upper protruding portion 12 are inserted into the I-shaped rail 81 and in sliding contact with the I-shaped rail 81, and the movement track of the I-shaped rail 81 is limited.

[0045] The I-shaped rail 81 is uniformly provided with a plurality of gear teeth 82 on the side away from the clamping head 8, the gear teeth 82 are engaged with the driven gear 61, the servo motor 6 serves as a power source and drives the power gear 62 to rotate through the output shaft, the power gear 62 is simultaneously engaged with the intermediate gear 63 and one of the driven gears 61 to form a meshing transmission, the intermediate gear 63 is further engaged with the other driven gear 61 to form a multi-stage linkage gear transmission system, and the two driven gears 61 are respectively engaged with the gear teeth 82 on the corresponding I-shaped rail 81, when the power gear 62 rotates, the two driven gears 61 are driven to realize reverse synchronous rotation through the reversing action of the intermediate gear 63, thereby driving the two I-shaped rails 81 to move in opposite directions, and finally realizing the synchronous approach or synchronous departure of the two clamping heads 8. This transmission mode can ensure that the clamping forces applied by the two clamping heads 8 are uniform in size and strictly symmetrical in position, effectively avoiding the deviation of the metal parts of the electric appliance due to uneven force, and ensuring the precise alignment of the focusing point of the laser beam with the welding position.

[0046] Meanwhile, the upper protrusion 12 at the end of the upper clamping plate 1 and the lower protrusion 21 at the end of the lower clamping plate 2 are both embedded in the inner groove of the I-shaped rail 81, and form a close sliding fit with the inner wall of the I-shaped rail 81. This structure provides stable guiding constraints for the movement of the I-shaped rail 81, preventing it from being laterally deflected or twisted during the movement of the chuck 8, and ensuring that the chuck 8 always moves smoothly along the preset trajectory. In addition, the I-shaped rail 81 is made of high-rigidity material, and its own structural stability effectively resists deformation during clamping; the tooth surface of the gear teeth 82 and the driven gear 61 is precisely machined, and the meshing gap is accurately controlled, further reducing the reverse gap during transmission. The synergistic effect of the two significantly improves the positioning accuracy of the chuck 8, and can meet the stringent requirements of the clamping tolerance during laser welding of electrical metal fittings. Even for miniature terminals, precision contacts and other small-sized fittings with extremely high welding position accuracy requirements, stable and reliable clamping positioning can be achieved.

[0047] A slot 83 is provided on one side of the I-shaped rail 81 near the chuck 8, and the cross section of the slot 83 is "U" shaped. The baffle plate 7 is inserted into the channel formed by the two slots 83 of the I-shaped rail 81, and the length of the baffle plate 7 is greater than the length of the upper clamping plate 1 and the lower clamping plate 2. The baffle strip 71 is installed at one end of the baffle plate 7 outside the slot 83, and the baffle strip 71 is in contact with the surface of the upper clamping plate 1. The baffle plate 7 directly seals the open gap between the upper clamping plate 1 and the lower clamping plate 2 through precise insertion with the slot 83 on the I-shaped rail 81. The length of the baffle plate 7 not only covers the entire clamping plate area, but also extends outward beyond the clamping plate edge, and cooperates with the baffle strip 71 at the end of the baffle plate 7 to tightly fit the surface of the upper clamping plate 1, forming a protective barrier between the gear transmission area and the welding operation area. This barrier can effectively intercept the high-temperature welding slag and metal dust generated during laser welding, preventing them from entering the gear meshing area between the upper and lower clamping plates, thereby avoiding the problem of meshing obstruction or jamming caused by the attachment of foreign matter on the gear teeth, and ensuring that the gear transmission system driven by the servo motor 6 always runs smoothly, driving the chuck 8 to accurately complete the opening and closing action.

[0048] When the servo motor 6 drives the gear transmission and drives the I-shaped rail 81 to move synchronously with the chuck 8, the baffle plate 7 is always stably inserted into the slot 83 and can slide synchronously with the movement of the I-shaped rail 81. This dynamic adaptive structure not only does not hinder the normal opening and closing of the chuck 8, ensuring the flexibility of the clamping action, but also continuously maintains the sealing state of the gap during the entire movement of the chuck 8, perfectly solving the inherent contradiction in traditional clamping structures that "a gap must be left to allow the chuck to move, but the gap is prone to foreign matter intrusion", and seamlessly coordinating the protection function with the clamping action.

[0049] The two ends of the shielding strip 71 are provided with side baffles 5, one end of the side baffles 5 is in contact with the upper clamping plate 1, and the side baffles 5 are connected and fixed with the upper clamping plate 1 through the limiting screws 4. The upper clamping plate 1 and the lower clamping plate 2 are provided with a pad 3 between them, the pad 3 is arranged on the side of the upper clamping plate 1 and the lower clamping plate 2 away from the clamp head 8, the end of the upper clamping plate 1 away from the clamp head 8 is provided with two rows of first perforations, one side of the pad 3 is provided with second perforations aligned with the first perforations, and one side of the lower clamping plate 2 is provided with two rows of screw holes matched with the first perforations. The limiting screws 4 pass through the channel formed by the first perforations and the second perforations and are screwed into the screw holes. The side of the upper clamping plate 1 away from the lower clamping plate 2 is recessed to form a groove 11, the groove 11 is communicated with the first perforations, two L-shaped plates 51 are inserted into the groove 11, one side of the L-shaped plates 51 is provided with third perforations aligned with the first perforations, the limiting screws 4 pass through the third perforations, one end of the L-shaped plates 51 on the outside of the groove 11 is connected and fixed with the side baffles 5, one end of the L-shaped plates 51 close to the side baffles 5 is connected and fixed with a connecting strip 52, the connecting strip 52 and the L-shaped plates 51 are integrally formed, the connecting strip 52 is connected and fixed with the side baffles 5, and the connecting strip 52 increases the connection range of the L-shaped plates 51 and the side baffles 5.

[0050] The pad 3 installed between the upper clamping plate 1 and the lower clamping plate 2 cooperates with the threaded sleeve 22 on the side of the upper clamping plate 1 facing the lower clamping plate 2 to jointly provide stable support for the upper clamping plate 1 and the lower clamping plate 2, enhance the rigidity of the connection between the two, effectively prevent structural deformation after long-term stress, and further improve the stability of the entire clamping mechanism. When the limiting screws 4 pass through the channel formed by the third perforations of the L-shaped plates 51, the first perforations of the upper clamping plate 1 and the second perforations of the pad 3, and are finally screwed into the screw holes of the lower clamping plate 2, this single fastener can simultaneously realize the limiting and fixing of the pad 3, the side baffles 5, the lower clamping plate 2 and the upper clamping plate 1, so that these components form a closely integrated whole. In this process, the position of the shielding plate 7 is also stabilized and limited, and multiple fixation can be achieved without additional fasteners, reducing the number of connecting components such as screws. In addition, the side baffles 5 extend outward from both ends of the shielding strip 71, further expanding the shielding range of welding slag, dust and other debris, and strengthening the protection effect to prevent debris from entering the transmission area from the side gap.

[0051] The shielding plate 7 and the side baffles 5, which are prone to performance degradation due to wear during long-term use, can be individually disassembled and replaced. Without disassembling or replacing the entire clamping mechanism, only the damaged vulnerable parts need to be replaced to restore the protection performance, greatly reducing the material waste caused by overall replacement, thereby reducing the cost of consumables. At the same time, since the shielding structure separates the transmission area where the gear and the I-beam 81 are located from the debris generated by welding, the erosion and wear of the transmission components by the debris are avoided, the service life of the core transmission components such as the gear and the I-beam 81 is significantly prolonged, the equipment downtime caused by transmission failure is reduced, and the failure rate of the equipment is reduced.

[0052] The two parallel inner walls in the slot 83 are each provided with a plurality of first slits arranged along the length direction of the I-beam 81, the two parallel sides of the shielding plate 7 are each provided with a plurality of second slits arranged along the length direction of the shielding plate 7, the lower part of the slot 83 is provided with a third slit 84, the pulling plate 72 is inserted into the third slit 84, the pulling plate 72 is fixedly connected with the shielding plate 7, a plurality of waist-shaped holes are equidistantly arranged on one side of the pulling plate 72, and a plurality of first slits are arranged along the length direction of the slot 83 in the I-beam 81; correspondingly, a plurality of second slits corresponding to the positions of the first slits are arranged on the two sides of the shielding plate 7. This design makes the inner wall of the slot 83 not completely fit the surface of the shielding plate 7, but forms contact through the edges between the slits, which greatly reduces the actual contact area of the two. This structure effectively reduces the frictional resistance generated when the shielding plate 7 slides in the slot 83, ensures that the shielding plate 7 can flexibly and synchronously slide with the movement of the I-beam 81, avoids the jamming or accelerated wear caused by excessive friction, and prolongs the service life of the shielding plate 7 and the I-beam 81.

[0053] Meanwhile, the pulling plate 72 is inserted into the third slit 84 at the lower part of the slot 83, and the pulling plate 72 is fixedly connected with the shielding plate 7 to form a close fit with the third slit 84. This fit not only provides additional guidance for the sliding of the shielding plate 7 to prevent the shielding plate 7 from deviating or shaking during movement, but also further enhances the connection stability between the shielding plate 7 and the slot 83, ensuring that the shielding plate 7 always maintains precise docking with the slot 83 in the vibrating environment of the welding operation, continuously plays an effective shielding role, and avoids the decline in protection performance caused by structural looseness.

[0054] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A clamping mechanism for laser welding of electrical metal parts, characterized in that, Include: Upper clamping plate (1); Lower clamping plate (2) is arranged on the lower side of upper clamping plate (1) and is arranged in parallel with upper clamping plate (1), the lower clamping plate (2) is connected with upper clamping plate (1) through a plurality of connecting screws (9); Servo motor (6) is installed in the middle position of the side of lower clamping plate (2) away from upper clamping plate (1), the output shaft of the servo motor (6) extends to the lower clamping plate (2) and the upper clamping plate (1) and is provided with a power gear (62), two driven gears (61) are rotatably installed between the lower clamping plate (2) and the upper clamping plate (1), the intermediate gear (63) is rotatably installed between the lower clamping plate (2) and the upper clamping plate (1), the intermediate gear (63) is engaged with one driven gear (61) and power gear (62), the driven gear (61) not engaged with the intermediate gear (63) is engaged with the power gear (62); Chuck (8) is provided with two, the end of the two chuck (8) close to each other is provided with an I-shaped rail (81), the I-shaped rail (81) is slidably installed between the upper clamping plate (1) and the lower clamping plate (2), the side of the I-shaped rail (81) away from the chuck (8) is uniformly provided with a plurality of gear teeth (82), the gear teeth (82) are engaged with the driven gear (61), the side of the I-shaped rail (81) close to the chuck (8) is provided with a slot (83), the slot (83) is "U” shaped in cross section; The shielding piece cooperates with the slot (83) to form a plug-in relationship for plugging the gap between the upper clamping plate (1) and the lower clamping plate (2); The shielding piece includes: Shielding plate (7) is inserted into the channel formed by the slot (83) of the two I-shaped rails (81), the length of the shielding plate (7) is greater than the length of the upper clamping plate (1) and the lower clamping plate (2); Shielding strip (71) is installed at one end of the shielding plate (7) outside the slot (83), the shielding strip (71) is in contact with the surface of the upper clamping plate (1); The connecting piece is provided with two groups, the connecting piece is installed between the shielding strip (71) and the upper clamping plate (1); The connecting piece includes side plate (5), both ends of the shielding strip (71) are provided with side plate (5), one end of the side plate (5) is in contact with the upper clamping plate (1), the side plate (5) is connected and fixed with the upper clamping plate (1) through the limiting screw (4); A plurality of first slits are machined on the two parallel inner walls in the slot (83), the first slits are arranged along the length direction of the I-shaped rail (81), a plurality of second slits are machined on the two parallel side surfaces of the shielding plate (7), the second slits are arranged along the length direction of the shielding plate (7); The third slit (84) is machined at the lower position in the slot (83), the pulling plate (72) is inserted into the third slit (84), the pulling plate (72) is connected and fixed with the shielding plate (7), a plurality of waist-shaped holes are equidistantly provided on one side surface of the pulling plate (72); The upper clamping plate (1) is provided with an upper protruding part (12) near one end of the I-shaped rail (81), the upper protruding part (12) is an integral molding structure with the upper clamping plate (1), the lower clamping plate (2) is provided with a lower protruding part (21) near one end of the I-shaped rail (81), the lower protruding part (21) is an integral molding structure with the lower clamping plate (2), the lower protruding part (21) and the upper protruding part (12) are inserted into the I-shaped rail (81) and in sliding contact with the I-shaped rail (81).

2. The clamping mechanism for laser welding of metal fittings of an electric appliance according to claim 1, wherein The upper clamping plate (1) and the lower clamping plate (2) are provided with a spacer (3) between them, the spacer (3) is arranged on the side of the upper clamping plate (1) and the lower clamping plate (2) away from the chuck (8), the upper clamping plate (1) is provided with two rows of first through holes at one end away from the chuck (8), the spacer (3) is provided with second through holes on one side surface in alignment with the first through holes, the lower clamping plate (2) is provided with two rows of screw holes on one side surface in cooperation with the first through holes, and the limiting screw (4) is screwed into the screw holes through the channel formed by the first through holes and the second through holes.

3. The clamping mechanism for laser welding of metal fittings of an electric appliance according to claim 2, wherein The upper clamping plate (1) is recessed to form a groove (11) on the side away from the lower clamping plate (2), the groove (11) is communicated with the first through holes, two L-shaped plates (51) are inserted into the groove (11), the L-shaped plates (51) are provided with third through holes on one side surface in alignment with the first through holes, the limiting screw (4) penetrates the third through holes, and one end of the L-shaped plates (51) on the outside of the groove (11) is connected and fixed with the side baffle (5).

4. The clamping mechanism for laser welding of metal fittings of an electric appliance according to claim 3, wherein The L-shaped plates (51) are connected and fixed with connecting strips (52) at one end near the side baffle (5), the connecting strips (52) are an integral molding structure with the L-shaped plates (51), and the connecting strips (52) are connected and fixed with the side baffle (5).

5. The clamping mechanism for laser welding of metal fittings of an electric appliance according to claim 1, wherein The lower clamping plate (2) is provided with a plurality of threaded sleeves (22) on the side facing the upper clamping plate (1), and the connecting screw (9) is screwed into the threaded sleeves (22) after penetrating the upper clamping plate (1).

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