Self-adapting tension wire feeding device of wire bonding machine

Abstract

The utility model relates to the field of wire welding machine discloses a kind of self-adaptive tension wire supply device of wire welding machine, including the installation plate and moving plate of U shape;The middle part between the opposite side of the left and right two side walls of the installation plate inner chamber is rotatably connected with screw rod by bearing, screw rod is connected between the moving plate, the left side of installation plate is fixed with motor, the output shaft of motor penetrates installation plate and extends to the inner chamber of installation plate and is fixed with screw rod, the left end and the right end of the front of moving plate are respectively provided with tension adjusting mechanism and wire supply mechanism;The wire supply mechanism includes the motor of fixed right end in the back of moving plate.The utility model, by three slidingly connected movable block, the position of each guide rod in vertical direction can be independently adjusted, so that operator can accurately control the winding wrap angle of metal wire on guide wheel, can adapt to reel of different material, different line diameter, significantly improve the versatility of wire welding machine self-adaptive tension wire supply device.

Description

Technical Field

[0001] This utility model relates to the field of wire bonding machine technology, and specifically to an adaptive tension wire supply device for a wire bonding machine. Background Technology

[0002] Wire bonding machines generally refer to ultrasonic wire bonding machines. Based on the type of wire, they can be divided into gold wire bonding machines, aluminum wire bonding machines, and copper wire bonding machines. They use heat, pressure, and ultrasonic energy to bond one end of a fine metal wire to the chip electrode and the other end to the lead frame or substrate, forming a stable electrical connection. In this process, stable control of the wire tension is one of the decisive factors in ensuring welding quality and improving production yield.

[0003] A search revealed Chinese patent CN207272421U, which discloses a wire feeding device for a wire welding machine with a welding nozzle. This utility model employs a back plate movably connected to a slide rail. Driven by a drive mechanism, the back plate can move back and forth along the slide rail, allowing the tension control mechanism and the wire feeding mechanism to move in the same direction as the welding nozzle. This avoids excessive changes in wire tension during welding, thus solving the problem that large relative displacement between the welding nozzle and the wire feeding device leads to large changes in wire tension, which easily causes inconsistent gold ball sizes and poor arc stability in the welded wires.

[0004] The aforementioned utility model effectively solves the problem of macroscopic path tension fluctuation caused by the large-scale movement of the welding nozzle by having the back plate drive the tension control mechanism and the wire feeding mechanism to move synchronously with the welding nozzle. However, the fixed guide rod structure cannot be flexibly adjusted for different wire materials or process requirements, resulting in the wrap angle of the metal wire on the tension sensing wheel being unadjustable, affecting the accuracy of tension control. At the same time, it is difficult to adapt to different wire materials, which can easily lead to excessive bending of thin wires or increased frictional resistance of thick wires. Based on this, an adaptive tension wire feeding device for a wire welding machine is proposed to solve the above problems. Utility Model Content

[0005] Based on the above description, this utility model provides an adaptive tension wire supply device for a wire bonding machine to solve the problem that a fixed guide rod structure cannot flexibly adjust to different wire materials or process requirements, resulting in the inability to adjust the wrap angle of the metal wire on the tension sensing wheel, thus affecting the accuracy of tension control.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: an adaptive tension wire supply device for a wire bonding machine, comprising a U-shaped mounting plate and a movable plate; A lead screw is rotatably connected to the middle of the left and right side walls of the inner cavity of the mounting plate via a bearing. The lead screw is threadedly connected to the moving plate. A No. 1 motor is fixed on the left side of the mounting plate. The output shaft of the No. 1 motor passes through the mounting plate and extends into the inner cavity of the mounting plate and is fixed to the lead screw. A tension adjustment mechanism and a wire supply mechanism are respectively provided on the left and right ends of the front of the moving plate. The cable supply mechanism includes a second motor fixed to the right end of the back of the movable plate. A rotating shaft is rotatably connected to the front of the movable plate via bearings. The output shaft of the second motor passes through the movable plate and extends to the front side of the movable plate and is fixed to the rotating shaft. A cable changing component is provided on the front of the rotating shaft. The tension adjustment mechanism includes three guide blocks fixed to the front of the movable plate, and a U-shaped movable block is slidably connected to the guide blocks.

[0007] By using the above technical solution, the moving plate and its tension adjustment mechanism and wire supply mechanism can move laterally as a whole, so that the wire supply mechanism and tension adjustment mechanism can move synchronously with the welding nozzle, maintaining the relative stability of the metal wire path, avoiding tension relaxation or tightness caused by path changes, and improving the yield of product welding.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the line changing component includes a turntable fixed to the front of the rotating shaft. Two connecting discs are rotatably connected to the front of the turntable via bearings. The two connecting discs are symmetrically arranged, and a connecting rod is provided inside the connecting disc. A spool is fixed to the front of the connecting rod.

[0010] With the above technical solution, when it is necessary to change the wire, the old connecting rod and the spool can be removed as a whole and replaced with a new one, which shortens the time required to replace the spool and improves the overall production efficiency of the wire bonding machine.

[0011] Furthermore, the turntable has a circular cross-sectional shape, and two motors are fixed on the back of the turntable. The output shafts of the two motors pass through the turntable and extend to the front side of the turntable, and are respectively fixed to two connecting plates.

[0012] The above technical solution allows the output shaft of the motor to rotate, thereby driving the connecting disc to rotate, which in turn causes the connecting rod and the spool to rotate.

[0013] Furthermore, a threaded groove is provided at the center of the front side of the connecting plate, and the threaded groove is threadedly connected to the connecting rod.

[0014] The above technical solution facilitates the separation of the connecting rod from the connecting disc, thereby allowing for the replacement of the spool.

[0015] Furthermore, a guide rod is fixed to the front of the movable block, and a tension sensor is installed on the rightmost movable block.

[0016] The above technical solution allows for adjustment of the position of each guide rod, thereby enabling adjustment of the wrapping angle of the metal wire on the guide wheel.

[0017] Furthermore, guide grooves are provided on both the left and right sides of the guide block, and limit blocks are fixed at the top and bottom of the opposite side of the left and right side walls of the inner cavity of the movable block, with the limit blocks and guide grooves being slidably connected.

[0018] Through the above technical solution, the guide groove and the limiting block can guide and limit the movement of the guide block.

[0019] Furthermore, both sides of the guide block are threaded with screws, and the opposite sides of the two screws pass through the guide block and extend into the guide groove.

[0020] The above technical solution allows the screw to lock the position of the guide block, thereby fixing the position of the guide rod in the vertical direction.

[0021] Furthermore, guide rails are fixed at both ends of the left and right side walls of the inner cavity of the mounting plate, and limit grooves are correspondingly provided at the upper and lower ends of the back of the movable plate.

[0022] The above technical solution allows the guide rail and limiting groove to limit the movement of the moving plate, ensuring that it can only move in a straight line.

[0023] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: By driving the moving plate and its tension adjustment mechanism and wire supply mechanism to move laterally as a whole, the wire supply mechanism and tension adjustment mechanism can move synchronously with the welding nozzle, maintaining the relative stability of the metal wire path and avoiding tension relaxation or tightness caused by path changes, thus improving the yield rate of product welding. Through three slidingly connected movable blocks, the position of each guide rod in the vertical direction can be adjusted independently, allowing the operator to accurately control the wrap angle of the metal wire on the guide wheel. It can adapt to spools of different materials and wire diameters, significantly improving the versatility of the adaptive tension wire supply device of the wire welding machine. Attached Figure Description

[0024] Figure 1 A schematic diagram of the overall structure of an adaptive tension wire supply device for a wire bonding machine provided in this embodiment of the present invention; Figure 2 This is a schematic diagram of the wire supply mechanism according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the guide block and screw in an embodiment of the present invention; Figure 4This is a schematic diagram of the tension adjustment mechanism according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the connecting rod and spool in an embodiment of the present invention; Figure 6 This is a schematic diagram of the guide rail and limiting groove in an embodiment of the present invention.

[0025] Attached reference numerals: 1. Mounting plate; 2. Moving plate; 3. Lead screw; 4. Motor No. 1; 5. Tension adjustment mechanism; 51. Guide block; 52. Movable block; 53. Screw; 54. Guide rod; 55. Tension sensor; 56. Guide groove; 57. Limit block; 6. Wire supply mechanism; 61. No. 2 motor; 62. Shaft; 63. Turntable; 64. Connecting plate; 65. Connecting rod; 66. Bollard; 67. Motor; 71. Guide rail; 72. Limiting groove. Detailed Implementation

[0026] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0028] Example: Reference Figure 1 An adaptive tension wire supply device for a wire bonding machine includes a U-shaped mounting plate 1 and a movable plate 2. A lead screw 3 is rotatably connected to the middle of the left and right side walls of the inner cavity of the mounting plate 1 via a bearing. The lead screw 3 is threadedly connected to the movable plate 2. A motor 4 is fixed on the left side of the mounting plate 1. The output shaft of the motor 4 passes through the mounting plate 1 and extends into the inner cavity of the mounting plate 1 and is fixed to the lead screw 3. A tension adjustment mechanism 5 and a wire supply mechanism 6 are respectively provided on the left and right ends of the front of the movable plate 2.

[0029] The output shaft of motor 4 drives the lead screw 3 to rotate, which in turn moves the movable plate 2 threaded onto the lead screw 3. At this time, the movable plate 2 can only move horizontally and linearly under the action of the guide rail 71 and the limiting groove 72, so that the wire supply mechanism 6 and the tension adjustment mechanism 5 can move synchronously with the movement of the welding nozzle.

[0030] refer to Figure 2 and Figure 3 The wire supply mechanism 6 includes a second motor 61 fixed to the right end of the back of the movable plate 2. The front of the movable plate 2 is rotatably connected to a rotating shaft 62 via a bearing. The output shaft of the second motor 61 passes through the movable plate 2 and extends to the front side of the movable plate 2 and is fixed to the rotating shaft 62. A wire changing component is provided on the front of the rotating shaft 62.

[0031] The line changing component includes a turntable 63 fixed on the front of the rotating shaft 62. Two connecting discs 64 are rotatably connected to the front of the turntable 63 via bearings. The two connecting discs 64 are symmetrically arranged. A connecting rod 65 is provided inside the connecting disc 64. A spool 66 is fixed to the front of the connecting rod 65.

[0032] In this embodiment, the turntable 63 has a circular cross-sectional shape. Two motors 67 are fixed on the back of the turntable 63. The output shafts of the two motors 67 pass through the turntable 63 and extend to the front side of the turntable 63 and are fixed to the two connecting plates 64 respectively. A threaded groove is provided at the center of the front of the connecting plate 64. The threaded groove is threadedly connected to the connecting rod 65. The threaded connection method is not only convenient to operate and does not require special tools, but also shortens the time for replacing the spool 66.

[0033] When the wire bonding machine starts working, one of the motors 67 is started, which in turn drives the spool 66 on the connecting plate 64 connected to it to rotate, passively releasing the metal wire and completing the basic wire feeding action. After the metal wire on the spool 66 is released, the second motor 61 can be started. The output shaft of the second motor 61 drives the rotating shaft 62 to rotate, which in turn drives the turntable 63 and the two connecting plates 64 on it to rotate synchronously. This allows the positions of the two connecting plates 64 to be adjusted so that the rotating connecting plate 64 can continue to release the metal wire. At this time, the operator can replace the spool 66 on the lower connecting plate 64. Since the connecting rod 65 is connected to the connecting plate 64 through a threaded groove, the operator only needs to rotate the connecting rod 65 to remove it from the connecting plate 64, thereby removing the entire spool 66.

[0034] refer to Figure 4 and Figure 5 The tension adjustment mechanism 5 includes three guide blocks 51 fixed on the front of the movable plate 2. A U-shaped movable block 52 is slidably connected to the guide block 51. A guide rod 54 is fixed on the front of the movable block 52. A tension sensor 55 is provided on the rightmost movable block 52. After the positions of the three guide rods 54 are set respectively, they together form the transition path of the metal wire from the wire supply mechanism 6 to the welding nozzle. By adjusting the height of these three points, the wrap angle of the metal wire when it passes around the rightmost guide rod 54 can be controlled.

[0035] The guide block 51 has guide grooves 56 on both its left and right sides. The top and bottom of the opposite side of the inner wall of the movable block 52 are fixed with limit blocks 57. The limit blocks 57 are slidably connected to the guide grooves 56. The limit blocks 57 can ensure that the movable block 52 can only move along a straight trajectory on the guide block 51. The guide block 51 has screws 53 threadedly connected to both its left and right sides. The opposite side of the two screws 53 passes through the guide block 51 and extends into the guide grooves 56. The screws 53 can stably lock the position of the movable block 52 after it moves to a suitable height on the guide block 51.

[0036] After installing or changing the type of wire, the operator needs to set the optimal path of the metal wire according to the process requirements. The movable block 52 can be manually slid to move up and down along the guide groove 56 on the guide block 51. At this time, the limiting block 57 on the inner side of the movable block 52 slides in the guide groove 56, ensuring the linear movement of the movable block 52 and preventing it from disengaging from the guide block 51. After the guide rod 54 on the movable block 52 is adjusted to a suitable height, the screw 53 is tightened. When the screw 53 is screwed in, one end will press against the guide groove 56, and the friction generated can firmly lock the movable block 52.

[0037] refer to Figure 6 The upper and lower ends of the inner walls of the mounting plate 1 are fixed with guide rails 71 on the opposite side, and the upper and lower ends of the back of the movable plate 2 are respectively provided with limit grooves 72.

[0038] It should be noted that the guide rail 71 and the limiting protrusion 72 are interlocked, which restricts the movement of the moving plate 2 to the horizontal direction extending along the guide rail 71, while avoiding the possibility of the moving plate 2 moving in the Y-axis and Z-axis directions.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An adaptive tension wire supply device for a wire bonding machine, comprising a U-shaped mounting plate (1) and a movable plate (2); Its features are, A lead screw (3) is rotatably connected to the middle of the left and right side walls of the inner cavity of the mounting plate (1) via a bearing. The lead screw (3) is threadedly connected to the moving plate (2). A motor (4) is fixed on the left side of the mounting plate (1). The output shaft of the motor (4) passes through the mounting plate (1) and extends into the inner cavity of the mounting plate (1) and is fixed to the lead screw (3). A tension adjustment mechanism (5) and a wire supply mechanism (6) are respectively provided on the left and right ends of the front of the moving plate (2). The wire supply mechanism (6) includes a second motor (61) fixed on the right side of the back of the movable plate (2). The front of the movable plate (2) is rotatably connected to a rotating shaft (62) via a bearing. The output shaft of the second motor (61) passes through the movable plate (2) and extends to the front side of the movable plate (2) and is fixed to the rotating shaft (62). A wire changing component is provided on the front of the rotating shaft (62). The tension adjustment mechanism (5) includes three guide blocks (51) fixed on the front of the movable plate (2), and a U-shaped movable block (52) is slidably connected to the guide blocks (51).

2. The adaptive tension wire supply device for a wire bonding machine according to claim 1, characterized in that, The line changing component includes a turntable (63) fixed on the front of the rotating shaft (62). Two connecting discs (64) are rotatably connected to the front of the turntable (63) via bearings. The two connecting discs (64) are symmetrically arranged. A connecting rod (65) is provided inside the connecting disc (64). A bobbin (66) is fixed on the front of the connecting rod (65).

3. The adaptive tension wire supply device for a wire bonding machine according to claim 2, characterized in that, The turntable (63) has a circular cross-sectional shape. Two motors (67) are fixed on the back of the turntable (63). The output shafts of the two motors (67) pass through the turntable (63) and extend to the front side of the turntable (63) and are respectively fixed to two connecting plates (64).

4. The adaptive tension wire supply device for a wire bonding machine according to claim 2, characterized in that, The connecting plate (64) has a threaded groove at the center of its front side, and the threaded groove is threadedly connected to the connecting rod (65).

5. The adaptive tension wire supply device for a wire bonding machine according to claim 1, characterized in that, A guide rod (54) is fixed on the front of the movable block (52), and a tension sensor (55) is provided on the rightmost movable block (52).

6. The adaptive tension wire supply device for a wire bonding machine according to claim 5, characterized in that, The guide block (51) has guide grooves (56) on both the left and right sides. The top and bottom of the inner wall of the movable block (52) are fixed with limit blocks (57) on opposite sides. The limit blocks (57) are slidably connected to the guide grooves (56).

7. The adaptive tension wire supply device for a wire bonding machine according to claim 6, characterized in that, Both sides of the guide block (51) are threaded with screws (53), and the opposite sides of the two screws (53) pass through the guide block (51) and extend into the guide groove (56).

8. The adaptive tension wire supply device for a wire bonding machine according to claim 1, characterized in that, The upper and lower ends of the inner walls of the mounting plate (1) are fixed with guide rails (71) on opposite sides, and the upper and lower ends of the back of the movable plate (2) are respectively provided with limiting grooves (72).

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