Ultrasonic welding machine for welding wire terminals

Abstract

The invention belongs to the technical field of ultrasonic welding, and particularly relates to an ultrasonic welding machine for welding wire terminals. The wire stranding machine comprises a machine pedestal, a welding seat, a positioning mechanism and a wire stranding mechanism, an ultrasonic generator, an amplitude-change pole and a welding head fixedly connected to the lower end of the amplitude-change pole are mounted on the machine pedestal; the welding seat is fixedly mounted on the base, and a driving mechanism for driving the positioning mechanism to move is arranged on the base; the wire stranding mechanism comprises a fixing frame, a lifting frame slidably connected to the fixing frame and a lifting air cylinder used for driving the lifting frame to ascend and descend. A moving frame is slidably connected to the lifting frame, a pushing air cylinder used for driving the moving frame to horizontally move is installed on the lifting frame, and twisting assemblies corresponding to the wire rods one to one are installed on the moving frame; through cooperation of the positioning mechanism and the wire stranding mechanism, wire cores of wires are stranded together before welding, and the problem that part of the wire cores cannot be welded to terminals due to bending divergence of the wire cores of the wires is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic welding, and in particular to an ultrasonic welding machine for welding wire terminals. Background Art

[0002] Welding wires and terminals together using an ultrasonic welding machine is a common connection method for wire terminals. The wires are wrapped with multiple cores. Before welding, the outer sheath of the wire ends needs to be peeled off to expose the cores. To ultrasonically weld the core wires to the terminal, the terminal's wire connection is placed on an anvil, and the core wire exposed by stripping the end of the wire is placed on the upper surface of the wire connection. Next, ultrasonic vibrations are applied by pressing the core wire on the wire connection with an ultrasonic horn, clamping the core wire and terminal between the anvil and the horn, thereby joining the core wire to the terminal's wire connection.

[0003] However, since the wire cores may be bent in all directions during the stripping process, if the wire cores are not neatly put together before welding, some of the wire cores may not be welded to the terminals, resulting in poor welding quality. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides an ultrasonic welding machine for welding wire terminals, which integrates the wire cores together by providing a positioning mechanism and a twisting mechanism, aiming to solve the problems in the background technology.

[0005] In order to achieve the above technical objectives, the specific technical solutions of the present invention are as follows: an ultrasonic welding machine for wire terminal welding proposed by the present invention comprises: a machine base, a welding base, a positioning mechanism and a twisting mechanism; an ultrasonic generator, a horn and a welding head fixedly connected to the lower end of the horn are installed on the machine base; wherein the welding base is used to support the wire terminal, the positioning mechanism is used to position the wire, and the twisting mechanism is used to twist the exposed wire cores at the ends of the wire, and the welding base is fixedly mounted on the base, and the base is provided with a driving mechanism for driving the positioning mechanism to move; the twisting mechanism comprises a fixed frame, a lifting frame slidably connected to the fixed frame, and a lifting cylinder for driving the lifting frame to lift and lower; a movable frame is slidably connected to the lifting frame, and a pushing cylinder for driving the movable frame to move horizontally is installed on the lifting frame, and a twisting assembly corresponding to the wires is installed on the movable frame.

[0006] As a preferred technical solution of the present invention, the twisting assembly includes a fixed seat fixedly installed under the movable frame, a limiting groove is provided at the lower end of the fixed seat, a pair of twisted wire blocks are slidably connected to the inner walls on both sides of the limiting groove, a sliding rod slidably connected to the fixed seat is fixedly connected to the twisted wire block, and a rack is fixedly connected to the sliding rod.

[0007] As a preferred technical solution of the present invention, a gear meshing with a rack is installed on the movable frame. When the gear rotates, it drives the two stranded wire blocks to move in different directions. The gear is coaxially fixedly connected to a spiral cylinder. A spiral groove is provided on the surface of the spiral cylinder. A slider is slidably connected in the spiral groove. A fixed rod corresponding to the spiral cylinder is fixedly connected to the lifting frame. The end of the fixed rod is fixedly connected to a shaft rod, and the shaft rod is rotatably connected to the slider.

[0008] As a preferred technical solution of the present invention, a pair of wire harness blocks are symmetrically fixedly connected to both sides of the limiting groove, and a wire harness hole is formed between the two wire harness blocks.

[0009] As a preferred technical solution of the present invention, a friction layer is provided on the surface of the stranded wire block, and an inclined surface structure is provided at one end of the two stranded wire blocks that are close to each other.

[0010] As a preferred technical solution of the present invention, the positioning mechanism includes a base frame, a plurality of clamping cylinders are fixedly mounted on the base frame, and a pair of clamping blocks are connected to the clamping cylinders.

[0011] As a preferred technical solution of the present invention, a micro motor is installed on one of the clamping blocks, a driving wheel is fixedly connected to the rotating shaft of the micro motor for driving the wire to move, and a color sensor is installed on the base frame for identifying the exposed length of the wire core.

[0012] As a preferred technical solution of the present invention, the driving mechanism includes a servo motor, a ball screw and a slide rail; a screw seat threadedly connected to the ball screw is fixedly installed at the bottom of the base frame, and the screw seat is slidably connected to the slide rail.

[0013] As a preferred technical solution of the present invention, the welding seat is provided with a plurality of grooves for placing wire terminals.

[0014] The beneficial effects of the present invention are:

[0015] 1. The present invention is provided with a positioning mechanism and a twisting mechanism to twist the wire cores together before welding, thereby solving the problem that the wire cores cannot be welded to the terminals due to the bending and divergence of the wire cores.

[0016] 2. The positioning mechanism of the present invention is provided with a micro motor and a color sensor. The micro motor is connected to a driving wheel. When the driving wheel rotates, it can drive the wire to move, thereby controlling the length of the wire core exposed to the clamping block, and further controlling the length of the wire core welded to the terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2This is a schematic diagram of the welding seat, positioning mechanism and stranding mechanism proposed in the present invention.

[0019] Figure 3 for Figure 2 Schematic diagram from another angle.

[0020] Figure 4 This is a schematic structural diagram of the wire twisting mechanism proposed in the present invention.

[0021] Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0022] Figure 6 This is a schematic structural diagram of the stranded wire assembly proposed in the present invention.

[0023] Figure 7 This is a schematic front view of the stranded wire assembly proposed by the present invention.

[0024] Figure 8 This is a structural schematic diagram of the positioning mechanism proposed in the present invention.

[0025] The corresponding names of the reference numerals in the figures are as follows: 100. Machine base; 101. Ultrasonic generator; 102. Horn; 103. Welding head; 200, welding seat; 201, groove; 300, positioning mechanism; 301, screw seat; 302, base frame; 303, clamping cylinder; 304, clamping block; 305, micro motor; 306, driving wheel; 307, color sensor; 400, stranding mechanism; 401, fixed frame; 402, lifting frame; 403, pushing cylinder; 404, stranding assembly; 4041, fixed seat; 4042, limiting groove; 4043, stranding block; 4044, bundle block; 4045, bundle hole; 4046, friction layer; 4047, slide bar; 4048, rack; 405, lifting cylinder; 406, gear; 407, spiral barrel; 4071, spiral groove; 4072, slide bar; 408, fixed rod; 4081, shaft; 409, movable frame; 500. Base; 501. Driving mechanism. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] Example: This embodiment discloses an ultrasonic welding machine for welding wire terminals, such as Figures 1-8As shown, it includes: a machine base 100, a welding base 200, a positioning mechanism 300 and a stranding mechanism 400; an ultrasonic generator 101, a horn 102 and a welding head 103 fixedly connected to the lower end of the horn 102 are installed on the machine base 100, and the ultrasonic generator 101 can be raised and lowered to drive the welding head 103 to descend. The welding head 103 is rectangular, which is convenient for covering all terminals; wherein, the welding base 200 is fixedly mounted on the base 500, and the welding base 200 is located below the welding head 103. The welding base 200 is used to support the wire terminals, and a plurality of grooves 201 for placing the wire terminals are provided on the welding base 200. In this embodiment, the number of grooves 201 is provided with three to ensure that the wire terminals are welded. The position is stable during connection, and the positioning mechanism 300 is used to position the wire so that the length of the wire core welded on the terminal remains consistent. The twisting mechanism 400 is used to twist the exposed wire cores at the ends of the wire to prevent the wire cores from bending and diverging and affecting the welding quality. The base 500 is provided with a driving mechanism 501 for driving the positioning mechanism 300 to move; the driving mechanism 501 includes a servo motor, a ball screw and a slide rail, the servo motor is fixedly mounted on the base 500, and the ball screw is connected to the servo motor, and the slide rail is fixedly mounted on the base 500, and the ball screw is driven to rotate by the servo motor, driving the positioning mechanism 300 toward the welding seat 200, so that the wire core moves to a position above the terminal for easy welding.

[0028] like Figure 4 As shown, the stranding mechanism 400 includes a fixed frame 401, a lifting frame 402 slidably connected to the fixed frame 401, and a lifting cylinder 405 for driving the lifting frame 402 to move up and down, wherein the fixed frame 401 is fixedly connected to the base 500 by bolts, a vertical slide rail is provided on the fixed frame 401, a slide seat slidably connected to the slide rail is fixedly connected to the lifting frame 402, and the lifting cylinder 405 is fixedly installed on the top of the fixed frame 401; a movable frame 409 is slidably connected to the lifting frame 402, and a movable frame 409 is installed on the lifting frame 402. It is equipped with a pushing cylinder 403 for driving the movable frame 409 to move horizontally, the lifting frame 402 is fixedly connected to a guide rod, the movable frame 409 is fixedly connected to a guide sleeve that is slidably connected to the guide rod, and the movable frame 409 is equipped with a twisting assembly 404 corresponding to the wire one by one. In this embodiment, there are three twisting assemblies 404. The movable frame 409 is driven to move horizontally by the pushing cylinder 403. During the movement, the twisting assembly 404 twists the wire cores neatly and together, which is convenient for welding the wire cores to the terminals.

[0029] like Figure 5-Figure 7As shown, the twisting assembly 404 includes a fixed base 4041 fixedly installed below the mobile frame 409, the fixed base 4041 is an inverted U-shaped structure, the lower end of the fixed base 4041 is provided with a limiting groove 4042, the inner walls of both sides of the limiting groove 4042 are slidably connected with a pair of twisted wire blocks 4043, the twisted wire blocks 4043 are in contact with the wire core, the inner wall of the limiting groove 4042 is provided with a sliding groove, the twisted wire blocks 4043 are fixedly connected with a sliding rod 4047 slidably connected to the fixed base 4041, and the sliding rod 4047 passes through the fixed seat 4041 and the mobile frame 409, and the upper end of the slide rod 4047 is fixedly connected to the rack 4048; the mobile frame 409 is equipped with a gear 406 that meshes with the rack 4048. The gear 406 is located between the two racks 4048. When the gear 406 rotates, it drives the two stranded wire blocks 4043 to move in different directions. The gear 406 is coaxially fixedly connected to the spiral drum 407. The surface of the spiral drum 407 is provided with a spiral groove 4071. The spiral groove 4071 is provided with a spiral groove 4071. The inner sliding connection is provided with a slider 4072, and the lifting frame 402 is fixedly connected with a fixed rod 408 corresponding to the spiral cylinder 407. The end of the fixed rod 408 is fixedly connected with a shaft 4081, and the shaft 4081 is rotatably connected to the slider 4072. When the cylinder 403 is pushed to drive the moving frame 409 to move, the slider 4072 slides in the spiral groove 4071, driving the spiral cylinder 407 and the gear 406 to rotate. When the gear 406 rotates, it drives the two racks 4048 to move in opposite directions. The two stranded wire blocks 4043 move in the same direction, thereby driving the two stranded wire blocks 4043 to move in different directions, that is, one of the stranded wire blocks 4043 rises and the other stranded wire block 4043 falls. The stranded wire blocks 4043 twist the wire cores, thereby twisting the wire cores together into a strand, which is convenient for welding the wire cores to the terminals. In the initial state, the two stranded wire blocks 4043 are respectively arranged at the upper and lower ends of the limiting slot 4042, and the length of the stranded wire block 4043 is approximately half the length of the limiting slot 4042.

[0030] Preferably, a pair of wire bundle blocks 4044 are symmetrically fixedly connected on both sides of the limiting groove 4042. The wire bundle blocks 4044 are arranged on a side close to the fixing seat 4041 and the welding seat 200. A wire bundle hole 4045 is formed between the two wire bundle blocks 4044, and a trumpet-shaped opening is provided at the lower end of the wire bundle hole 4045 to facilitate moving the wire core into the wire bundle hole 4045 when the fixing seat 4041 descends. When the movable frame 409 moves, the wire bundle hole 4045 first draws the divergent wire cores together, and then twists the wire cores together through the twisting block 4043.

[0031] Preferably, a friction layer 4046 is provided on the surface of the stranded wire block 4043 to increase the friction between the stranded wire block 4043 and the wire core, facilitating better twisting, and the ends of the two stranded wire blocks 4043 close to each other are provided with an inclined structure. When the stranded wire block 4043 initially moves, the distance between the two stranded wire blocks 4043 gradually decreases, and the stranded wire block 4043 is in more complete contact with the wire core, facilitating better twisting of the wire core.

[0032] like Figure 8 As shown, the positioning mechanism 300 includes a base frame 302, on which a plurality of clamping cylinders 303 are fixedly mounted, and there are three clamping cylinders 303. A pair of clamping blocks 304 are connected to the clamping cylinders 303, and the clamping cylinders 303 can drive the two clamping blocks 304 to move closer to each other; a micro motor 305 is installed on one of the clamping blocks, and a driving wheel 306 is fixedly connected to the rotating shaft of the micro motor 305 for driving the wire to move, and a wire groove is provided on the driving wheel 306 and the other clamping block 304. When the driving wheel 306 rotates, the wire moves, and the length of the wire core exposed from the clamping block is adjusted. The color sensor 307 is installed on the base frame 302 to identify the exposed length of the wire core, wherein the color of the wire core is different from the color of the wire sheath. The color of the wire is identified by the color sensor 307, and a signal is sent to the controller, which then drives the wire to move by rotating the driving wheel 306 so that the position where the wire core is just exposed corresponds to the position of the color sensor 307. A screw seat 301 threadedly connected to the ball screw is fixedly installed at the bottom of the base frame 302, and the screw seat 301 is slidably connected to the slide rail.

[0033] Working principle: Place the terminal in the corresponding groove 201 on the welding seat 200, manually clamp the wire between the clamping block 304 and the driving wheel 306 on each clamping cylinder 303, and use the micro motor 305 to drive the driving wheel 306 to rotate, and adjust the length of the wire core exposed from the clamping block 304 to ensure that the exposed length of the wire core of each wire is the same. Then, the lifting cylinder 405 drives the lifting frame 402 to descend, and the lifting frame 402 drives the fixed seat 4041 to descend, and the wire moves into the limiting groove 4042. The wire core moves into the bundle hole 4045, and then the cylinder 403 is pushed to drive the moving frame 409 to move toward the end of the wire core. During the movement, the wire core is straightened together through the bundle hole 4045, and at the same time, the spiral barrel 407 occurs Rotate, drive gear 406 to rotate, gear 406 drives two racks 4048 to move in different directions, and then the two twisting blocks 4043 move in different directions. During the movement of the two twisting blocks 4043, the wire cores are twisted together by friction. After twisting, the lifting cylinder 405 drives the lifting frame 402 to rise to its original height, and the moving frame 409 moves back to its original position to avoid obstructing the movement of the positioning mechanism 300. Then the driving mechanism 501 drives the positioning mechanism 300 to move toward the welding seat 200, and the wire core moves to a position above the terminal. Then the welding head 103 descends and presses on the wire core and the terminal to weld the wire core to the terminal. After welding is completed, the welding head 103 rises to its original position, and the positioning mechanism 300 also moves back to its original position.

[0034] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An ultrasonic welding machine for wire terminal welding, characterized in that: include: A machine base (100), a welding base (200), a positioning mechanism (300) and a stranding mechanism (400); An ultrasonic generator (101), a horn (102), and a welding head (103) fixedly connected to the lower end of the horn (102) are installed on the machine base (100); The welding seat (200) is used to support the wire terminal, the positioning mechanism (300) is used to position the wire, and the twisting mechanism (400) is used to twist the exposed wire cores at the ends of the wire. The welding seat (200) is fixedly mounted on the base (500), and the base (500) is provided with a driving mechanism (501) for driving the positioning mechanism (300) to move. The stranding mechanism (400) comprises a fixed frame (401), a lifting frame (402) slidably connected to the fixed frame (401), and a lifting cylinder (405) for driving the lifting frame (402) to move up and down. The lifting frame (402) is slidably connected to a moving frame (409), the lifting frame (402) is equipped with a pushing cylinder (403) for driving the moving frame (409) to move horizontally, and the moving frame (409) is equipped with twisting assemblies (404) corresponding to the wires one by one.

2. The ultrasonic welding machine for wire terminal welding according to claim 1, characterized in that: The twisting assembly (404) includes a fixed seat (4041) fixedly mounted below the mobile frame (409); a limiting groove (4042) is provided at the lower end of the fixed seat (4041); a pair of twisted wire blocks (4043) are slidably connected to the inner walls of both sides of the limiting groove (4042); a sliding rod (4047) slidably connected to the fixed seat (4041) is fixedly connected to the twisted wire blocks (4043); and a rack (4048) is fixedly connected to the sliding rod (4047).

3. The ultrasonic welding machine for wire terminal welding according to claim 2, characterized in that: The movable frame (409) is provided with a gear (406) meshing with the rack (4048). When the gear (406) rotates, it drives the two stranded wire blocks (4043) to move in different directions. The gear (406) is coaxially fixedly connected to a spiral barrel (407). A spiral groove (4071) is provided on the surface of the spiral barrel (407). A slider (4072) is slidably connected in the spiral groove (4071). A fixed rod (408) corresponding to the spiral barrel (407) is fixedly connected to the lifting frame (402). An end of the fixed rod (408) is fixedly connected to a shaft (4081). The shaft (4081) is rotatably connected to the slider (4072).

4. The ultrasonic welding machine for wire terminal welding according to claim 3, characterized in that: A pair of wire harness blocks (4044) are symmetrically and fixedly connected to both sides of the limiting groove (4042), and a wire harness hole (4045) is formed between the two wire harness blocks (4044).

5. The ultrasonic welding machine for wire terminal welding according to claim 4, characterized in that: Furthermore, a friction layer (4046) is provided on the surface of the stranded wire block (4043), and an inclined surface structure is provided on the ends of the two stranded wire blocks (4043) that are close to each other.

6. The ultrasonic welding machine for wire terminal welding according to claim 5, characterized in that: The positioning mechanism (300) comprises a base frame (302), a plurality of clamping cylinders (303) are fixedly mounted on the base frame (302), and a pair of clamping blocks (304) are connected to the clamping cylinders (303).

7. The ultrasonic welding machine for wire terminal welding according to claim 6, characterized in that: A micro motor (305) is mounted on one of the clamping blocks (304), a driving wheel (306) is fixedly connected to the rotating shaft of the micro motor (305) for driving the wire to move, and a color sensor (307) is mounted on the base frame (302) for identifying the exposed length of the wire core.

8. The ultrasonic welding machine for wire terminal welding according to claim 7, characterized in that: The driving mechanism (501) comprises a servo motor, a ball screw and a slide rail; a screw seat (301) threadedly connected to the ball screw is fixedly mounted on the bottom of the base frame (302), and the screw seat (301) is slidably connected to the slide rail.

9. The ultrasonic welding machine for wire terminal welding according to claim 8, characterized in that: The welding seat (200) is provided with a plurality of grooves (201) for placing wire terminals.

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