A laser welding device for welding links of a welded chain

Abstract

This invention relates to the field of laser welding technology, and in particular provides a laser welding device for welding chain links, including a base. The top of the base is provided with two slide rails, one in the front and one in the back. A displacement seat capable of moving left and right is installed on the two slide rails. An opening is formed from the top surface of the base downwards. An auxiliary seat is fixed inside the opening. The top surface of the auxiliary seat is inclined to the lower right. A movable cavity is formed between the right side of the auxiliary seat and the right side of the opening. The displacement seat spans the movable cavity longitudinally. Two clamping assemblies are installed on the displacement seat. A limit frame is installed on the top surface of the base. The limit frame is located on the right side of the clamping assembly. A vertically upward limiting plate is fixed on the limit frame. When used in conjunction with the head of a laser welding machine, only manual loading is required, and manual positioning is not required, thereby reducing the fatigue intensity of the workers.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, and in particular to a laser welding device for welding chain links. Background Technology

[0002] Welded bent plate chains are used in traditional mechanical equipment. Their core is a conveying structure consisting of multiple chain plates and sleeves hinged together. In these machines, they primarily function as material conveyors. Welding of bent plate chains is done using traditional welding machines. Since each chain link consists of two chain plates welded to a sleeve between them, current technology, to improve welding accuracy, requires a laser welding machine to weld the ends of the sleeves to the chain plates. However, laser welding machines lack automatic positioning functions on their worktables. When a robotic arm with a welding torch welds the sleeves onto the chain plates, workers must manually press the ends of the two sleeves onto the chain plates. After welding, manual unloading is also required, resulting in low efficiency and high labor intensity. Summary of the Invention

[0003] To address the aforementioned problems and improve laser welding efficiency by pre-positioning the sleeve and chain plate during laser welding of chain links, this invention provides the following technical solution:

[0004] A laser welding device for welding chain links includes a base. The top of the base has two sliding rails, one front and one rear. A displacement seat capable of moving left and right is mounted on each of the two sliding rails. An opening is formed downwards from the top surface of the base. An auxiliary seat is fixed within the opening. The top surface of the auxiliary seat is inclined downwards to the right. A movable cavity is formed between the right side of the auxiliary seat and the right side of the opening. The displacement seat spans longitudinally across the movable cavity. Two clamping assemblies are mounted on the displacement seat. A limit frame is mounted on the top surface of the base, located to the right of the clamping assemblies. A vertically upward limiting plate is fixed on the limit frame. The two clamping assemblies are symmetrically positioned on the front and rear sides of the limiting plate. A sliding groove is formed on the displacement seat. A screw is installed within the sliding groove. The screw has opposing threads on both sides. The two clamping assemblies include transmission seats that drive the opposing threads on both sides of the screw, and also include mounting... A positioning seat is located on the top of the transmission seat. A carrier plate is welded to the limiting plate. When the clamping assembly moves to the auxiliary seat, it deflects to the lower right. The clamping assembly also includes a pusher fixed to the left side of the bottom of the positioning seat. A column located beside the positioning seat is fixed on the pusher. A sleeve parallel to the side of the positioning seat is welded to the top of the column. A drive rod is fitted inside the sleeve. The left end of the drive rod extends beyond the left side of the column, and the right end extends beyond the right end of the sleeve and towards the limiting plate. A swing arm is connected to the left end of the drive rod. The free end of the swing arm deflects to the left side of the positioning seat. When the right end of the drive rod pushes against the limiting plate and continues to move to the right, the drive rod moves to the left along the sleeve, and the left end of the drive rod pushes the swing arm, causing the free end of the swing arm to extend towards the left side of the positioning seat.

[0005] As a further preferred embodiment, a connecting seat is provided on the bottom surface of the base, and a connecting hole is formed on the top surface of the base from the bottom surface of the connecting seat. A bolt is installed in the connecting hole, and the base is fixed to the worktable of the laser welding machine by means of the bolt.

[0006] As a further preferred embodiment, the top surface of the positioning seat is provided with an arc-shaped groove that communicates with the left and right sides, and the arc-shaped groove is perpendicular to the limiting plate.

[0007] As a further preferred embodiment, the sleeve has a stepped hole, the right section of which communicates with the sleeve, and the left section of which communicates with the left end of the sleeve. The diameter of the right section of the stepped hole is larger than the diameter of the left section of the stepped hole. The drive rod is assembled in the stepped hole, a pressure plate is fixed on the right side of the drive rod, and a spring is sleeved on the left side of the drive rod. The pressure plate is located in the right section of the stepped hole, and the spring is located in the left section of the stepped hole, with its right end abutting against the pressure plate and its left end abutting against the left end of the stepped hole.

[0008] As a further preferred embodiment, a pull rod is fixed to the top of the column, the pull rod bends toward the left side of the swing arm and pulls on the left side of the swing arm, and a vertically upward limiting rod is fixed to the free end of the swing arm.

[0009] As a further preferred embodiment, each of the two pushers is fixed with a support rod at its left end, the top surfaces of the two support rods are horizontal and on the same horizontal plane, and a step is provided at the left end of the positioning seat, the top surface of the step and the top surface of the support rod are on the same horizontal plane.

[0010] As a further preferred embodiment, the top of the transmission seat is provided with a hinge seat, a hinge shaft is mounted on the hinge seat, the positioning seat is rotatably connected to the hinge shaft, and stop plates are fixed on the front and rear side surfaces of the positioning seat, with the bottom surface of the stop plates resting on the hinge seat.

[0011] As a further preferred embodiment, a cam is fixed on the pusher. When the cam moves to the left relative to the inclined surface of the auxiliary seat and continues to move to the left along the inclined surface of the auxiliary seat, the pusher causes the positioning seat to deflect to the lower right relative to the outlet.

[0012] The advantages of this invention compared to the prior art are:

[0013] This device is used as a tooling to position the sleeves and chain plates welded into chain links. Two sleeves are placed in the arc-shaped grooves on two positioning seats, and the chain plates are placed upright on the carrier plate. The laser welding machine head, driven by a robotic arm, automatically moves to the left side of the chain plate, close to the left welding area, according to the input program. The displacement seat moves the two clamping assemblies to the right, causing the right ends of the two drive rods to press against the left side of the limiting plate and continue moving to the right. The right ends of the two drive rods are then obstructed, causing them to move to the left. The left ends of the two drive rods, through a hinged connection, push the hinged end of the swing arm to the left. The free end of the swing arm, restricted by the pull rod, deflects the limiting rod towards the step. After deflecting towards the step, the sleeve will press against the left end. Simultaneously, the clamp assembly moves to the right, pressing the right end of the sleeve against the left side of the chain plate via the positioning seat. The left side of the chain plate is under pressure, while the right side is restricted by the limiting plate. The left end of the sleeve is restricted by the limiting rod, and the right end is restricted by the left side of the chain plate. This simultaneously positions both sleeves and the chain plate, and also positions one end of each sleeve against the chain plate. The laser welding machine head aligns with this end of the two sleeves and sequentially performs circular welding, welding this end of the two sleeves to the chain plate. This device is fixed to the worktable of the laser welding machine. When used with the laser welding machine head, only manual loading is required, eliminating the need for manual positioning and reducing manual fatigue. The inclined surface on the auxiliary seat deflects the two retracted positioning seats, allowing for rapid material output after welding, improving welding efficiency and further reducing manual fatigue. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a laser welding device for welding chain links provided for an embodiment of the present invention. In the figure, B represents the head of the laser welding machine, C represents the sleeve that makes up the chain link, and D represents the chain plate that makes up the chain link.

[0015] Figure 2 A laser welding device for welding chain links provided in this embodiment of the invention comprises... Figure 1 Enlarged schematic diagram of part A;

[0016] Figure 3 A laser welding device for welding chain links provided in this embodiment of the invention comprises... Figure 1 A schematic diagram showing the clamp assembly in its disassembled state;

[0017] Figure 4 A laser welding device for welding chain links provided in this embodiment of the invention comprises... Figure 3 A schematic diagram of the clamp assembly only;

[0018] Figure 5 A schematic diagram of the base and components on the base in a laser welding device for welding chain links provided for an embodiment of the present invention;

[0019] Figure 6 A front view schematic diagram of a laser welding device for welding chain links provided for an embodiment of the present invention;

[0020] Figure 7 A laser welding device for welding chain links provided in this embodiment of the invention comprises... Figure 6 A schematic diagram showing the angle of deflection to the lower right when the extended clamp assembly moves toward the auxiliary seat.

[0021] In the diagram: 1. Base; 2. Slide rail; 3. Displacement seat; 4. Exit; 5. Auxiliary seat; 6. Movable cavity; 7. Clamp assembly; 71. Transmission seat; 72. Positioning seat; 73. Arc groove; 74. Push frame; 75. Sleeve; 76. Drive rod; 77. Swing arm; 78. Stepped hole; 79. Pressure plate; 710. Spring; 711. Pull rod; 712. Limiting rod; 713. Carrier rod; 714. Step; 715. Hinge seat; 716. Hinge shaft; 717. Stop plate; 718. Cam; 8. Limiting frame; 9. Limiting plate; 10. Slide groove; 11. Screw; 12. Carrier plate; 13. Connecting seat. Detailed Implementation

[0022] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] In one implementation, such as Figures 1-7 As shown: This embodiment provides a laser welding device for welding chain links, including a base 1. The top of the base 1 is provided with two slide rails 2, one in the front and one in the back. A displacement seat 3 is installed on the two slide rails 2. A screw is installed on at least one slide rail 2. A motor is installed at one end of the screw (existing transmission technology, omitted in this invention; the motor drives the screw to rotate, which can make the displacement seat 3 move left and right along the slide rail 2). A drain 4 is opened downward from the top surface of the base 1. An auxiliary seat 5 is fixed in the drain 4. The top surface of the auxiliary seat 5 is inclined to the lower right. A movable cavity 6 is formed between the right side of the auxiliary seat 5 and the right side of the drain 4. The displacement seat 3 spans the movable cavity 6 longitudinally and longitudinally. The base 1 is equipped with two clamping assemblies 7, one at the front and one at the back. A limit frame 8 is installed on the top surface of the base 1. The limit frame 8 is located on the right side of the clamping assembly 7. A vertically upward limit plate 9 is fixed on the limit frame 8. The two clamping assemblies 7 are symmetrically located on the front and back sides of the limit plate 9. A sliding groove 10 is provided on the displacement seat 3. A screw 11 is installed in the sliding groove 10. The two sides of the screw 11 are provided with opposing threads. The two clamping assemblies 7 include a transmission seat 71 that is respectively driven on the opposing threads on both sides of the screw 11. It also includes a positioning seat 72 installed on the top of the transmission seat 71. A carrier plate 12 is welded on the limit plate 9. When the clamping assembly 7 moves to the auxiliary seat 5, the clamping assembly 7 deflects to the lower right.

[0024] The clamp assembly 7 also includes a pusher 74 fixed to the left side of the bottom of the positioning seat 72. A column located beside the positioning seat 72 is fixed on the pusher 74. A sleeve 75 parallel to the side of the positioning seat 72 is welded to the top of the column. A drive rod 76 is fitted inside the sleeve 75. The left end of the drive rod 76 extends beyond the left side of the column, and the right end of the drive rod 76 extends beyond the right end of the sleeve 75 and extends toward the limiting plate 9. A swing arm 77 is connected to the left end of the drive rod 76. The free end of the swing arm 77 is deflected to the left side of the positioning seat 72. When the right end of the drive rod 76 continues to move to the right against the limiting plate 9, the drive rod 76 moves to the left along the sleeve 75, and the left end of the drive rod 76 pushes the swing arm 77, so that the free end of the swing arm 77 extends toward the left side of the positioning seat 72.

[0025] As a further preferred embodiment, a connecting seat 13 is provided on the bottom surface of the base 1, and a connecting hole is opened from the bottom surface of the connecting seat 13 to the top surface of the base 1. A bolt is installed in the connecting hole, and the base 1 is fixed on the worktable of the laser welding machine by means of the bolt.

[0026] As a further preferred embodiment, the top surface of the positioning seat 72 is provided with an arc-shaped groove 73 that is open to the left and right, and the arc-shaped groove 73 is perpendicular to the limiting plate 9.

[0027] As a further preferred embodiment, a stepped hole 78 is provided inside the sleeve 75. The right section of the stepped hole 78 communicates with the sleeve 75, and the left section of the stepped hole 78 communicates with the left end of the sleeve 75. The diameter of the right section of the stepped hole 78 is larger than the diameter of the left section of the stepped hole 78. The drive rod 76 is assembled inside the stepped hole 78. A pressure plate 79 is fixed on the right section of the drive rod 76, and a spring 710 is sleeved on the left section of the drive rod 76. The pressure plate 79 is located inside the right section of the stepped hole 78, and the spring 710 is located inside the left section of the stepped hole 78, with its right end pressing against the pressure plate 79 and its left end pressing against the left end of the stepped hole 78.

[0028] As a further preferred embodiment, a pull rod 711 is fixed to the top of the column, the pull rod 711 bends toward the left side of the swing arm 77 and pulls on the left side of the swing arm 77, and a vertically upward limiting rod 712 is fixed to the free end of the swing arm 77.

[0029] like Figure 2 , Figure 6 ,as well as Figure 7 As shown, the top of the transmission seat 71 is provided with a hinge seat 715, and a hinge shaft 716 is installed on the hinge seat 715. The positioning seat 72 is rotatably connected to the hinge shaft 716. Stop plates 717 are fixed on the front and rear sides of the positioning seat 72. The bottom surface of the stop plate 717 rests on the hinge seat 715. A cam 718 is fixed on the push frame 74. When the cam 718 moves to the left relative to the inclined surface of the auxiliary seat 5 and continues to move to the left along the inclined surface of the auxiliary seat 5, the push frame 74 drives the positioning seat 72 to deflect to the lower right relative to the outlet 4.

[0030] Working principle and effect: Before use, the device is fixed to the worktable of the laser welding machine using the connecting seat 13 and bolts. During use, the device is used as a tool to position the sleeve C and chain plate D welded into chain links. The positioning principle is as follows: The two sleeves C are manually placed in the arc grooves 73 on the two positioning seats 72 respectively. The chain plate D is placed on the carrier plate 12. The laser welding machine head B, driven by the robot arm (existing technology of laser welding machines, according to the program input based on the welding position, not described in detail), automatically moves to the left side of the chain plate D and approaches the left welding area of ​​the chain plate D. The displacement seat 3 moves to the right with the two clamping seat assemblies 7, so that the two driving links... The right end of rod 76 continues to move to the right against the left side of the limiting plate 9, causing the right ends of the two drive rods 76 to be obstructed and thus move to the left. The left ends of the two drive rods 76 use a hinged relationship to push the hinged end of the swing arm 77 to move to the left. The free end of the swing arm 77 is restricted by the pull rod 711, thus causing the limiting rod 712 to deflect towards the step 714. Since the step 714 is the left end structure of the positioning seat 72, and the sleeve C is placed in the arc-shaped groove 73 on the top of the positioning seat 72, the limiting rod 712 will abut against the left end of the sleeve C after deflecting towards the step 714. At the same time, the clamp assembly 7 moves to the right and will also hold the sleeve C through the positioning seat 72. The right end rests against the left side of the chain plate D. At this time, the left side of the chain plate D is under pressure, while the right side is restricted by the limiting plate 9. The left end of the sleeve C is restricted by the limiting rod 712, and the right end is restricted by the left side of the chain plate D. This allows the two sleeves C and the chain plate D to be positioned simultaneously, and also positions one end of each sleeve C together with the chain plate D. The laser welding machine head B aligns with this end of the two sleeves C and sequentially performs circular welding, welding this end of the two sleeves C onto the chain plate D. This device is fixed on the worktable of the laser welding machine. When used with the laser welding machine head B, only manual loading is required, and manual positioning is not needed, thus reducing manual fatigue. The positioning method is efficient. When the right end of the sleeve C is positioned towards the left side of the limiting plate 9, the trigger drive rod 76 drives the limiting rod 712 to deflect to the right, and the left end of the sleeve C is positioned simultaneously. The positioning structure realizes multiple linkage actions with one action. The positioning structure is compact. In particular, the left end of the sleeve C is positioned by the swing arm 77 deflecting the limiting rod 712, while the right end of the sleeve C is stationary on the left side of the chain plate D. This makes the welding area of ​​the right end of the sleeve C and the left side of the chain plate D fully exposed, which makes it convenient for the laser welding machine head B to complete the whole circle welding according to the circular welding trajectory of the end of the sleeve C under the control of the robot and the program.

[0031] like Figure 1As shown, if the handwheel is turned, the screw 11 will rotate, causing the two transmission seats 71 to move in opposite directions along the sliding groove 10 on the displacement seat 3. The two transmission seats 71 will then move in opposite directions along the two clamping assemblies 7, thereby adjusting the distance between the two clamping assemblies 7. The distance between the two positioning seats 72 will be adjusted, and the distance between the arc grooves 73 on the two positioning seats 72 will be adjusted. For various types of chain links, the distance between the sleeve C and the chain plate D during welding is predetermined. When welding chain links in batches, the positioning efficiency can be improved, which is in line with the high-efficiency welding characteristics of laser welding machines.

[0032] like Figure 2 , Figure 4 As shown, when the clamp assembly 7 moves to the right (when the sleeve C moves to the right to be positioned after welding onto the chain plate D), the right ends (free ends) of the two drive rods 76 are blocked by the limiting plate 9. When they move to the left along the sleeve 75 under the obstruction, the pressure plate 79 pushes the spring 710 to the left. The spring 710 is compressed and shortened. The left end of the drive rod 76 moves to the left and drives the swing arm 77 to deflect to the right using the hinge relationship. When the clamp assembly 7 moves to the left (when the sleeve C moves to the left to retract after welding onto the chain plate D), the right ends of the two drive rods 76 move away from the limiting plate 9. The spring 710 becomes longer and pushes the pressure plate 79 to the right. The pressure plate 79 drives the drive rod 76 to move to the right. The left end of the drive rod 76 pulls the swing arm 77 back to the left through the hinge relationship. At the same time, the pusher 74 moves to the left, which in turn moves the cam 718 to the left. The cam 718 enters the inclined surface of the auxiliary seat 5. Driven by the inclined surface, the pusher 74, along with the positioning seat 72, moves relative to the outlet 4. Figure 7 As shown, the chain link deflects to the lower right, and due to this deflection, the chain link welded to the positioning seat 72 exits through the outlet 4. (Example) Figure 3 As shown, the bottom of the outlet 4 is equipped with a rearwardly inclined discharge plate, which facilitates the directional discharge of the chain links after welding, thus solving the problem of automatic discharge during welding. This discharge method also utilizes the structural feature of the clamp assembly 7 that moves left and right. The left and right movement structure feature is not only reflected in how to quickly position during welding, but also in how to quickly discharge after welding. No manual labor is required during discharge.

[0033] like Figure 2As shown, each of the two pushers 74 has a support rod 713 fixed to its left end. The top surfaces of the two support rods 713 are horizontal and on the same horizontal plane. The left end of the positioning seat 72 has a step 714. The top surface of the step 714 is on the same horizontal plane as the top surface of the support rod 713. After the above welding, and with the chain link automatically discharged, only one chain plate D is welded to one end of the two sleeves C. At this time, the welded chain link is placed on the clamping assembly 7 with the two sleeves C facing right and the chain plate D facing left. During placement, the bottom end of the chain plate D rests on the step 714 at the left end of the two positioning seats 72. Then, the second chain plate D is placed on the carrier plate 12, with the other end of the two sleeves C without the chain plate D welded facing the left side of the second chain plate D. Using the same driving method, the two clamping assemblies 7 move to the right with the welded chain link. The right end of the drive rod 76 is blocked by the limiting plate 9 and moves to the left. The left end uses the hinge relationship to push the free end of the swing arm 77, which, along with the limiting rod 712, is positioned on the left side of the welded first chain plate D. Positioning is formed on the surface. Using the same positioning method, the two sleeves C on the welded chain link are repositioned on the arc grooves 73 on the top of the two positioning seats 72, and their right ends are positioned on the left side of the second chain plate D. The welding machine head B is controlled to move using the same welding procedure, so that the second chain plate D is also welded. After the clamp assembly 7 is moved to the left and the material is removed in the same way, the final welded link product is obtained (one chain plate D is welded to each of the left and right ends of the two sleeves C). In mass production, after the first chain plate D is welded to one end of the sleeve C through one positioning, the second chain plate D is welded to the other end of the two sleeves C through a second positioning. This is suitable for mass production and conforms to the high-efficiency welding characteristics of laser welding machines.

[0034] In practical applications, the laser welding machine can be programmed to control the displacement seat 3, which in turn moves the two clamping assemblies 7, left and right. For example, when the welding head B moves to the welding area, the program controls the motor to rotate the screw, which in turn moves the displacement seat 3 to the right, completing the welding. When the welding head B finishes welding and is retracted upwards under program control, the program controls the motor to rotate the screw in the opposite direction, which in turn moves the displacement seat 3 to the left, and the pusher 74 moves the cam 718 to the left onto the inclined surface of the auxiliary seat 5, completing the deflection and material discharge. Program control is an existing control technology in laser welding machines, requiring technicians to program the machine according to the welding process and the movement trajectory of the welding head B.

[0035] The above orientation references do not represent the specific orientations of each component in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and to make relative descriptions based on the orientations of the references. In reality, the specific orientations of each component are based on their actual installation and use, as well as the orientation descriptions that are customary to those skilled in the art. This is hereby stated.

[0036] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A laser welding device for welding chain links, characterized in that, Includes a base (1), the top of which is provided with two front and rear slide rails (2), and a displacement seat (3) capable of moving left and right is installed on the two slide rails (2). A drain (4) is opened downward from the top surface of the base (1), and an auxiliary seat (5) is fixed inside the drain (4). The top surface of the auxiliary seat (5) is inclined to the lower right, and a movable cavity (6) is formed between the right side of the auxiliary seat (5) and the right side of the drain (4). The displacement seat (3) spans the movable cavity (6) longitudinally from front to back. Two clamping assemblies (7) are installed on the displacement seat (3). The top surface of the base (1) A limiting frame (8) is installed, located on the right side of the clamp assembly (7). A vertically upward limiting plate (9) is fixed on the limiting frame (8). The two clamp assemblies (7) are symmetrically positioned on the front and rear sides of the limiting plate (9). A sliding groove (10) is provided on the displacement seat (3). A screw (11) is installed in the sliding groove (10). The two sides of the screw (11) are provided with opposing threads. The two clamp assemblies (7) include a transmission seat (71) that drives the opposing threads on both sides of the screw (11), and a fixed plate installed on the top of the transmission seat (71). The positioning seat (72) has a carrier plate (12) welded on the limiting plate (9). When the clamp assembly (7) moves to the auxiliary seat (5), the clamp assembly (7) deflects to the lower right. The clamp assembly (7) also includes a push frame (74) fixed to the left side of the bottom of the positioning seat (72). A column located next to the positioning seat (72) is fixed on the push frame (74). A sleeve (75) parallel to the side of the positioning seat (72) is welded to the top of the column. A drive rod (76) is fitted inside the sleeve (75). The left end of the drive rod (76) passes through the left side of the column. In addition, the right end of the drive rod (76) passes through the right end of the sleeve (75) and extends toward the limiting plate (9). The left end of the drive rod (76) is connected to a swing arm (77). The free end of the swing arm (77) is deflected to the left side of the positioning seat (72). When the right end of the drive rod (76) continues to move to the right against the limiting plate (9), the drive rod (76) moves to the left along the sleeve (75) and the left end of the drive rod (76) pushes the swing arm (77), so that the free end of the swing arm (77) extends toward the left side of the positioning seat (72).

2. The laser welding device for welded chain links according to claim 1, characterized in that, A connecting seat (13) is provided on the bottom surface of the base (1). A connecting hole is provided on the top surface of the base (1) from the bottom surface of the connecting seat (13). A bolt is installed in the connecting hole, and the base (1) is fixed on the worktable of the laser welding machine by means of the bolt.

3. The laser welding apparatus for welded chain links according to claim 2, characterized in that, The top surface of the positioning seat (72) is provided with an arc-shaped groove (73) that is open to the left and right, and the arc-shaped groove (73) is perpendicular to the limiting plate (9).

4. The laser welding apparatus for welded chain links according to claim 3, characterized in that, A stepped hole (78) is provided inside the sleeve (75). The right section of the stepped hole (78) communicates with the sleeve (75), and the left section of the stepped hole (78) communicates with the left end of the sleeve (75). The diameter of the right section of the stepped hole (78) is larger than the diameter of the left section of the stepped hole (78). The drive rod (76) is assembled inside the stepped hole (78). A pressure plate (79) is fixed on the right side section of the drive rod (76), and a spring (710) is sleeved on the left side section of the drive rod (76). The pressure plate (79) is located inside the right section of the stepped hole (78), and the spring (710) is located inside the left section of the stepped hole (78), with its right end pressing against the pressure plate (79) and its left end pressing against the left end of the stepped hole (78).

5. The laser welding apparatus for welded chain links according to claim 4, characterized in that, A pull rod (711) is fixed at the top of the column. The pull rod (711) bends to the left side of the swing arm (77) and pulls on the left side of the swing arm (77). A vertically upward limiting rod (712) is fixed at the free end of the swing arm (77).

6. The laser welding apparatus for welded chain links according to claim 5, characterized in that, The left ends of both pushers (74) are fixed with a carrier rod (713). The top surfaces of the two carrier rods (713) are horizontal and on the same horizontal plane. The left end of the positioning seat (72) is provided with a step (714). The top surface of the step (714) is on the same horizontal plane as the top surface of the carrier rod (713).

7. The laser welding apparatus for welded chain links according to claim 6, characterized in that, The top of the transmission seat (71) is provided with a hinge seat (715), and a hinge shaft (716) is installed on the hinge seat (715). The positioning seat (72) is rotatably connected to the hinge shaft (716). Stop plates (717) are fixed on the front and rear sides of the positioning seat (72), and the bottom surface of the stop plate (717) rests on the hinge seat (715).

8. The laser welding apparatus for welded chain links according to claim 7, characterized in that, A cam (718) is fixed on the pusher (74). The cam (718) moves to the left relative to the inclined surface of the auxiliary seat (5). When the cam (718) moves to the left and continues to move to the left along the inclined surface of the auxiliary seat (5), the pusher (74) drives the positioning seat (72) to deflect to the lower right relative to the outlet (4).

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