Strip waste winding machine and winding method thereof

Abstract

The present application relates to a kind of strip waste winding machine and winding method thereof.The device includes sequentially arranged feeding roller, driving roller, first wire guide drum, tensioning roller, second wire guide drum, third wire guide drum and winding drum in discharge direction, curvature adjusting roller is arranged between third wire guide drum and winding drum, vertical first air cylinder is arranged on the frame above winding drum, the free end of first air cylinder piston rod is connected with longitudinal shaft, transverse plate is arranged on the frame, first waist slot and second waist slot are respectively formed in the transverse plate on the two sides of first air cylinder, longitudinal limiting shaft is inserted in first waist slot and second waist slot, the two ends of limiting shaft are connected with the two ends of longitudinal shaft through upper connecting rod, the two ends of limiting shaft are hingedly connected with lower connecting rod, pressure roller is arranged above winding drum, lower connecting rod free end is connected with the side surface of pressure roller, the device can adapt to the characteristics of copper strip, complete automatic collection to copper strip waste, applicable in industrial production, with strong practicability.

Description

Technical Field

[0001] This invention belongs to the technical field of chip lead frame production equipment, and particularly relates to a strip waste winding machine and its winding method. This device is suitable for recycling waste copper strips during the chip lead frame manufacturing process. Background Technology

[0002] As a chip carrier for integrated circuits, the lead frame is a key structural component that uses bonding materials (gold wire, aluminum wire, copper wire) to achieve electrical connection between the internal circuit leads of the chip and the external leads, forming an electrical circuit. It acts as a bridge connecting to external wires. Most semiconductor integrated circuits require the use of lead frames, which are an important basic material in the electronics and information industry.

[0003] In existing lead frame manufacturing processes, lead forming is mostly achieved by using molds and copper strips in conjunction with a high-speed press. However, the resulting copper strip waste is mostly discharged via conveyor and is not automatically collected. Even with existing material collection devices in other fields, the copper strip itself has a certain stress, causing it to be unable to be smoothly rolled into a bundle. The rolled copper strip expands outward like a spiral spring. Therefore, this invention aims to provide a copper strip waste winding machine suitable for lead frame manufacturing processes to solve the problem of copper strip waste recycling. Summary of the Invention

[0004] The problem with the existing technology is that the copper strip itself has a certain stress, which makes it impossible to smoothly roll the wound copper strip into a bundle. The wound copper strip will expand outward like a spiral spring. In order to overcome this shortcoming, the present invention provides a strip waste winding machine and its winding method.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] A strip waste winding machine includes a base, comprising a feed roller, a drive roller, a first feed drum, a tension roller, a second feed drum, a third feed drum, and a winding drum arranged sequentially along the discharge direction. A curvature adjusting roller for compressing and bending the strip waste is disposed between the third feed drum and the winding drum. The base includes a vertical frame, the winding drum is rotatably connected to the frame, and a vertical first cylinder is disposed on the frame above the winding drum. The free end of the piston rod of the first cylinder is connected to a longitudinal shaft. The frame is equipped with… A horizontal plate, located on both sides of the first cylinder, has a first waist-shaped groove and a second waist-shaped groove respectively. A longitudinal limiting shaft is inserted in both the first waist-shaped groove and the second waist-shaped groove. Both ends of the limiting shaft are connected to the two ends of the longitudinal shaft via an upper connecting rod. Both ends of the limiting shaft are hinged to a lower connecting rod. A pressure roller is provided above the winding drum. The free end of the lower connecting rod is connected to the side of the pressure roller. A protrusion is provided on the side of the winding drum. A compression spring is provided inside the protrusion. The free end of the compression spring is connected to a limiting block. The other end of the limiting block is located outside the protrusion.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: Due to the setting of the curvature adjustment roller, the copper strip can be bent, so that the copper strip enters the winding drum more smoothly. Considering that the copper strip itself has a certain rigidity and toughness, the rest of the copper strip will not change during the local bending process. Therefore, it is necessary to divide the long strip of copper strip into several segments and bend each segment separately. During the bending process, the stress existing in the copper strip itself is eliminated, and it is avoided that when the thickness of the copper strip on the winding drum increases, the stress of the copper strip itself expands to the outside of the winding drum, resulting in excessive gaps between the bundled copper strips after winding. This device is suitable for industrial production and has strong practicality.

[0008] As a preferred embodiment, both ends of the limiting shaft are provided with limiting shoulders, which abut against the side of the horizontal plate. The end of the limiting shaft has an internal thread, with a stud screwed into the internal thread. The upper connecting rod is sleeved on the end of the limiting shaft, and the lower connecting rod is sleeved on the stud. A locking nut is screwed onto the free end of the stud, and the locking nut abuts against the outer end face of the lower connecting rod. Due to the detachable design of the lower connecting rod, when the coil needs to be disassembled, the first cylinder first uses the pressure roller to pre-press the copper strip on the coil. After pre-pressing, the lower connecting rod is disassembled and connected to the coil, ensuring the pressure roller position remains unchanged and maintaining the pressure on the copper strip, preventing the copper strip on the coil from loosening.

[0009] As a preferred embodiment, the frame is equipped with several horizontal second cylinders. A U-shaped frame is fixed to the free end of the piston rod of each second cylinder. The two ends of the curvature adjustment roller are connected to the corresponding ear plate sections of the U-shaped frame. The diameter of the curvature adjustment roller connected to the free end of each second cylinder is arranged from small to large along the vertical upward direction. The combination of the second cylinders and curvature adjustment rollers of different diameters allows for adjustment of the copper strip's curvature when the thickness of the copper strip on the coil changes. By selecting curvature adjustment rollers of different diameters, a suitable curvature can be changed to adapt to changes in the outer diameter and thickness of the copper strip on the coil.

[0010] As a preferred embodiment, a bracket is provided on the base located between the first cable tray and the tensioning roller. A mounting plate extends from the side of the bracket, and a vertical third cylinder is fixedly connected to the mounting plate. The free end of the piston rod of the third cylinder is connected to both ends of the tensioning roller.

[0011] As a preferred embodiment, the central axes of the first cable tray and the second cable tray are aligned.

[0012] As a preferred embodiment, a motor mounting base is provided on the machine base located between the feed roller and the first wire guide roller, and a speed reducer is mounted on the motor mounting base. The central shaft of the drive roller is connected to the output end of the speed reducer.

[0013] A winding method for a strip waste material winding machine includes the following steps:

[0014] Step 1: The scrap copper strip is laid along the direction of the feed roller, drive roller, first guide roller, tension roller, second guide roller, third guide roller and winding roller through the external conveying equipment;

[0015] Step 2: After laying, adjust the tensioning rollers to ensure that the copper strip scrap on the entire line is under tension;

[0016] Step 3: Use the curvature adjustment roller to bend the copper strip between the third wire feeding drum and the winding drum, so that the copper strip is bent before entering the winding drum, making it easier to fit the surface of the winding drum.

[0017] Step 4: Increase the frequency of the curvature adjustment roller bending the copper strip, bend the copper strip in multiple places, and complete the pre-bending of the copper strip.

[0018] Step 5: Control the first cylinder and use the linkage between the upper and lower connecting rods to adjust the distance between the pressure roller and the winding drum, while flattening the copper strip.

[0019] Step 6: When the copper strip on the coil reaches the specified thickness, first adjust the position of the pressure roller through the first cylinder so that the pressure roller applies a pre-tightening force to the copper strip on the coil. After fixing the position of the pressure roller, disassemble the lower connecting rod from the limiting shaft, rotate it to the side of the coil, press the limiting block, and use the rebound force of the compression spring to connect the limiting block with the lower connecting rod.

[0020] Step 7: Cut the copper strip, remove the coil from the frame, and replace it with a new coil. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0023] Figure 3 This is a schematic diagram of the structure inside the protrusion in this invention.

[0024] Figure 4 This is a schematic diagram of the upper connecting rod, lower connecting rod, and limiting shaft in this invention.

[0025] In the diagram: 1. Base, 2. Feed roller, 3. Drive roller, 4. First feed roller, 5. Tension roller, 6. Second feed roller, 7. Third feed roller, 8. Roller, 9. Curvature adjustment roller, 10. Frame, 11. First cylinder, 12. Longitudinal shaft, 13. Horizontal plate, 14. First waist-shaped groove, 15. Second waist-shaped groove, 16. Limiting shaft, 17. Upper connecting rod, 18. Lower connecting rod, 19. Pressure roller, 20. Protrusion, 21. Compression spring, 22. Limiting block, 23. Limiting shoulder, 24. Stud, 25. Locking nut, 26. Second cylinder, 27. U-shaped frame, 28. Bracket, 29. Mounting plate, 30. Third cylinder, 31. Motor mounting base. Detailed Implementation

[0026] The technical solution of this application will be further described below with reference to the accompanying drawings and embodiments.

[0027] like Figure 1-3As shown, a strip waste winding machine includes a feed roller 2, a drive roller 3, a first feed drum 4, a tension roller 5, a second feed drum 6, a third feed drum 7, and a winding drum 8 arranged sequentially along the discharge direction. A curvature adjusting roller 9 for compressing and bending the strip waste is located between the third feed drum 7 and the winding drum 8. The machine base 1 includes a vertical frame 10. The winding drum 8 is rotatably connected to the frame 10. A vertical first cylinder 11 is installed on the frame 10 above the winding drum 8. The free end of the piston rod of the first cylinder 11 is connected to a longitudinal shaft 12. A horizontal plate 13 is installed on the frame 10. A first waist-shaped groove 14 and a second waist-shaped groove 15 are respectively opened on the horizontal plates 13 on both sides of the cylinder 11. A longitudinal limiting shaft 16 is inserted in both the first waist-shaped groove 14 and the second waist-shaped groove 15. Both ends of the limiting shaft 16 are connected to the two ends of the longitudinal shaft 12 via the upper connecting rod 17. Both ends of the limiting shaft 16 are hinged to the lower connecting rod 18. A pressure roller 19 is arranged above the winding drum 8. The free end of the lower connecting rod 18 is connected to the side of the pressure roller 19. A protrusion 20 is arranged on the side of the winding drum 8. A compression spring 21 is arranged in the protrusion 20. The free end of the compression spring 21 is connected to the limiting block 22. The other end of the limiting block 22 is located outside the protrusion 20.

[0028] like Figure 4 As shown, specifically, both ends of the limiting shaft 16 are provided with limiting shoulders 23, which abut against the side of the horizontal plate 13. The end of the limiting shaft 16 has an internal thread, and a stud 24 is screwed into the internal thread. The upper connecting rod 17 is sleeved on the end of the limiting shaft 16, and the lower connecting rod 18 is sleeved on the stud 24. A locking nut 25 is screwed onto the free end of the stud 24, and the locking nut 25 abuts against the outer end face of the lower connecting rod 18. This invention discloses a connection method between the limiting shaft 16 and the lower connecting rod 18. Through the cooperation of the stud 24 and the locking nut 25, the lower connecting rod 18 and the limiting shaft 16 are detachably connected, and the lower connecting rod 18 will not interfere with the end of the limiting shaft 16 during rotation.

[0029] Specifically, a horizontal second cylinder 26 is installed on the frame 10. A U-shaped frame 27 is fixedly connected to the free end of the piston rod of the second cylinder 26. The two ends of the curvature adjusting roller 9 are connected to the corresponding ear plate sections of the U-shaped frame 27. The curvature adjusting roller 9 is controlled by a cylinder, but is not limited to this control method.

[0030] Specifically, a bracket 28 is provided on the base 1 located between the first cable tray 4 and the tensioning roller 5. A mounting plate 29 extends from the side of the bracket 28. A vertical third cylinder 30 is fixed on the mounting plate 29. The free end of the piston rod of the third cylinder 30 is connected to both ends of the tensioning roller 5.

[0031] Specifically, a motor mounting base 31 is provided on the base 1 located between the feed roller 2 and the first wire feeding roller 4. A reducer is installed on the motor mounting base 31, and the central shaft of the drive roller 3 is connected to the output end of the reducer.

[0032] A winding method for a strip waste material winding machine includes the following steps:

[0033] Step 1: The scrap copper strip is laid along the direction of feed roller 2, drive roller 3, first cable tray 4, tension roller 5, second cable tray 6, third cable tray 7 and coil 8 through external conveying equipment;

[0034] Step 2: After the laying is completed, the vertical position of the tensioning roller 5 is adjusted by the third cylinder 30 to tension the copper strip, so that the copper strip waste on the entire line is in a taut state.

[0035] Step 3: Use the curvature adjustment roller 9 to bend the copper strip between the third winding drum 7 and the winding drum 8, so that the copper strip is bent before entering the winding drum 8, making it easier to enter the winding drum 8. By selecting different second cylinders 26, the curvature adjustment rollers 9 of different diameters are extended to change the bending curvature of the copper strip. As the copper strip on the winding drum 8 continues to wind and accumulates thickness, the curvature of the copper strip entering the winding drum 8 will change. In order to make the subsequent copper strip fit the outer surface better, the curvature of the subsequent copper strip is controlled and changed by the curvature adjustment roller 9. During the bending process, the stress existing in the copper strip itself is eliminated, and the copper strip is prevented from expanding outwards from the winding drum 8 due to its own stress when the thickness of the copper strip on the winding drum 8 increases, which would result in an excessive gap between the bundled copper strips after winding.

[0036] Step 4: Increase the bending frequency of the curvature adjusting roller 9 on the copper strip to bend the copper strip in multiple places, completing the pre-bending of the copper strip. Due to the toughness and rigidity of the copper strip itself, when it is bent in a local area, the rest will not change accordingly. Therefore, increasing the bending frequency of the curvature adjusting roller 9 is regarded as dividing the copper strip on the entire production line into several local parts and bending them separately, so that the entire copper strip can enter the coil 8 more smoothly. The specific parameters can be controlled by the PLC program.

[0037] Step 5: Control the first cylinder 11, and use the linkage between the upper connecting rod 17 and the lower connecting rod 18 to adjust the distance between the pressure roller 19 and the winding drum 8, while flattening the copper strip; use the pressure roller 19 to roll flat the bent copper strip, and at the same time, flatten the wound copper strip on the winding drum 8.

[0038] Step Six: When the copper strip thickness on the coil 8 reaches the specified thickness, first adjust the position of the pressure roller 19 using the first cylinder 11 so that the pressure roller 19 applies a pre-pressing force to the copper strip on the coil 8. After fixing the position of the pressure roller 19, separate the lower connecting rod 18 from the limiting shaft 16, rotate it to the side of the coil 8, press the limiting block 22, and use the rebound force of the compression spring 21 to connect the limiting block 22 with the lower connecting rod 18. During the disassembly process, the lower connecting rod 18 ensures that the pressure roller 19 always applies pressure to the copper strip on the coil 8. By using the positional limitation relationship of the lower connecting rods 18 on both sides, it is ensured that the pressure roller 19 is always in a pressing state on the copper strip when disassembling the coil 8, preventing the copper strip on the coil 8 from becoming loose during the disassembly process.

[0039] Step 7: Cut the copper strip, remove the coil 8 from the frame 10, and replace it with a new coil 8. The coil 8 and the frame 10 are designed to be detachable, so that when the copper strip on the coil 8 reaches a certain thickness, it can be quickly replaced, thereby improving the efficiency of recycling waste copper strip.

[0040] This invention is not limited to the above embodiments. Based on the technical solutions disclosed in this invention, those skilled in the art can make some substitutions and modifications to some of the technical features without creative effort, and all such substitutions and modifications are within the protection scope of this invention.

Claims

1. A strip waste winding machine, comprising a base (1), characterized in that: The machine includes a feed roller (2), a drive roller (3), a first feed roller (4), a tension roller (5), a second feed roller (6), a third feed roller (7), and a winding roller (8) arranged sequentially along the discharge direction. A curvature adjustment roller (9) for bending the copper strip scrap is provided between the third feed roller (7) and the winding roller (8). The machine base (1) includes a vertical frame (10). The winding roller (8) is rotatably connected to the frame (10). A vertical first cylinder (11) is provided on the frame (10) above the winding roller (8). The free end of the piston rod of the first cylinder (11) is connected to a longitudinal shaft (12). A horizontal plate (13) is provided on the frame (10). A first waist-shaped groove (14) and a second waist-shaped groove (15) are respectively opened on the horizontal plates (13) on both sides of the first cylinder (11). A longitudinal limiting shaft (16) is inserted in both the first waist-shaped groove (14) and the second waist-shaped groove (15). Both ends of the limiting shaft (16) are connected to the two ends of the longitudinal shaft (12) via an upper connecting rod (17). Both ends of the limiting shaft (16) are hinged to a lower connecting rod (18). A pressure roller (19) is provided above the winding drum (8). The free end of the lower connecting rod (18) is connected to the side of the pressure roller (19). A protrusion (20) is provided on the side of the winding drum (8). A compression spring (21) is provided in the protrusion (20). The free end of the compression spring (21) is connected to a limiting rod. The other end of the positioning block (22) is located outside the protrusion (20). Both ends of the positioning shaft (16) are provided with positioning shoulders (23). The positioning shoulders (23) abut against the side of the horizontal plate (13). The end of the positioning shaft (16) is provided with an internal thread, and a stud (24) is screwed into the internal thread. The upper connecting rod (17) is sleeved on the end of the positioning shaft (16), and the lower connecting rod (18) is sleeved on the stud (24). A locking nut (25) is screwed into the free end of the stud (24). The locking nut (25) abuts against the outer end face of the lower connecting rod (18). Several horizontal second cylinders (26) are provided on the frame (10). Each second cylinder ( 26) The free ends of the piston rods are all fixed with U-shaped frames (27). The two ends of the curvature adjustment roller (9) are connected to the corresponding ear plate sections of the U-shaped frame (27). The diameter of the curvature adjustment roller (9) connected to the free ends of each second cylinder (26) is set from small to large in the vertical upward direction. A bracket (28) is set on the base (1) between the first cable tray (4) and the tension roller (5). A mounting plate (29) extends from the side of the bracket (28). A vertical third cylinder (30) is fixed on the mounting plate (29). The free end of the piston rod of the third cylinder (30) is connected to both ends of the tension roller (5). The central axes of the first cable tray (4) and the second cable tray (6) are set flush.

2. The strip waste winding machine according to claim 1, characterized in that: A motor mounting base (31) is provided on the machine base (1) located between the feed roller (2) and the first wire feeding roller (4). A speed reducer is installed on the motor mounting base (31), and the central shaft of the drive roller (3) is connected to the output end of the speed reducer.

3. The winding method of a strip waste winding machine according to claim 1 or 2, characterized in that: It includes the following steps, Step 1: The scrap copper strip is laid along the direction of the feed roller (2), drive roller (3), first cable tray (4), tension roller (5), second cable tray (6), third cable tray (7) and coil (8) by external conveying equipment; Step 2: After the laying is completed, adjust the tension roller (5) so that the copper strip waste on the entire line is in a tensioned state; Step 3: Use the curvature adjustment roller (9) to bend the copper strip between the third wire feeding drum (7) and the winding drum (8), so that the copper strip bends before entering the winding drum (8) to facilitate its fit to the surface of the winding drum (8); Step 4: Increase the curvature adjustment roller (9) to bend the copper strip at multiple points to complete the pre-bending of the copper strip; Step 5: Control the first cylinder (11), and use the linkage between the upper connecting rod (17) and the lower connecting rod (18) to adjust the distance between the pressure roller (19) and the coil drum (8), and at the same time flatten the copper strip; Step 6: When the thickness of the copper strip on the coil (8) reaches the specified thickness, first adjust the position of the pressure roller (19) through the first cylinder (11) so that the pressure roller (19) applies a pre-pressing force to the copper strip on the coil (8). After fixing the position of the pressure roller (19), separate the lower connecting rod (18) from the limiting shaft (16), rotate it to the side of the coil (8), press the limiting block (22), and use the rebound force of the compression spring (21) to connect the limiting block (22) with the lower connecting rod (18). Step 7: Cut the copper strip, remove the coil (8) from the frame (10), and replace it with a new coil (8).

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