Copper strip flattening and rolling device used after lead frame of stamping chip

Abstract

The invention discloses a copper strip flattening and winding device used after a lead frame of a stamping chip. The copper strip flattening and winding device comprises a rack, a winding mechanism and a copper strip channel, wherein the winding mechanism is provided with a copper strip coil taking-out structure; the copper strip channel comprises a copper strip inlet and a copper strip outlet; a copper strip driving wheel assembly is arranged at the front end of the rack; a plurality of radial convex columns which are arranged at intervals along the circumference and are clamped with a plurality of punched holes of a copper strip are arranged on the circumferential surface of a copper strip driving wheel in the copper strip driving wheel assembly; a copper strip tightening mechanism for pressing and tightening the copper strip when the copper strip driving wheel stops rotating is arranged at the rear end of the rack; a first punching mechanism which comprises a lining plate and a plurality of punches and is used for punching a copper strip punched edge turnup part is arranged on the rack close to the copper strip driving wheel assembly; and a second flattening mechanism which comprises a lining plate and a plurality of punches and is used for flattening the flanging part of the punched edge of the copper strip is arranged on the rack adjacent to the first flattening mechanism. The device has strong pertinence on the turned part of the punching edge, such as a large turned edge and a small burr, is concentrated in stress, has a good compacting and flattening effect, and relatively saves energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field of copper strip recycling equipment, in particular to a copper strip flattening and winding device after a lead frame of a punched chip is punched. Background Art

[0002] Chip lead frames are typically formed by repeatedly and regularly punching the desired shape from a copper strip, also known as a copper material strip. The stamped copper strip then features multiple rows of through-holes along its length, such as waist-shaped holes on either side and rectangular holes in the center. The two rows of waist-shaped holes somewhat resemble the shape of a film strip. After the chip lead frame is stamped, the copper strip is typically reeled up for recycling.

[0003] During the actual winding and recycling process, the downward or upward curled parts of the punching hole edges, such as large curling edges and small burrs, need to be flattened. Otherwise, the copper strip will become loose, wrinkled or layered during the winding process, affecting the flatness and winding quality of the copper strip and hindering the subsequent recycling effect.

[0004] However, the existing technology uses at least one pair, and usually multiple pairs, of rollers to flatten the downward or upward curled portions of the copper strip's punched hole edges, such as large curled edges and small burrs. In production practice, this roller-rolling flattening method has the following shortcomings: 1. The curled portions of the punched hole edges, such as large curled edges and small burrs, only occupy a very small portion of the copper strip's area. Using a large-area roller, the force is applied evenly, which is not very targeted. The compaction effect after rolling is not ideal, and the phenomenon of the curled portions, such as large curled edges and small burrs, rebounding and stretching is common. 2. In order to flatten the curled edges and burrs on a very small portion of the copper strip, multiple high-power motors are required, which consumes relatively high energy. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a copper strip flattening and winding device after the lead frame of the punched chip, which has strong targeting, concentrated force, good punching and flattening effect and relatively saves energy for the curled parts of the punched edge such as large curled edges and small burrs.

[0006] The technical solution of the present invention is to provide a copper strip flattening and winding device after stamping the lead frame of the chip, comprising a frame, a winding mechanism with a structure for taking out the copper strip roll, and a copper strip channel with a copper strip inlet and a copper strip outlet;

[0007] A copper belt driving wheel assembly is provided at the front end of the frame. A plurality of radial protrusions are arranged on the circumferential surface of the copper belt driving wheel in the copper belt driving wheel assembly and are arranged at intervals along the circumference and engage with a plurality of punched holes in the copper belt; a copper belt tensioning mechanism is provided at the rear end of the frame for pressing and tightening the copper belt when the copper belt driving wheel stops rotating;

[0008] A first flattening mechanism is provided on the frame adjacent to the copper belt driving wheel assembly and includes a lining plate and a plurality of punches for flattening the rolled portion of the copper belt punching edge.

[0009] A second flattening mechanism is provided on a machine frame adjacent to the first flattening mechanism and comprises a lining plate and a plurality of punches and is used for flattening the rolled portion of the punched edge of the copper strip.

[0010] After adopting the above structure, the copper strip flattening and winding device after punching the lead frame of the chip of the present invention has the following advantages:

[0011] The core invention of the present invention is that the copper strip tensioning mechanism first tightens the copper strip of the section to be flattened, so that the copper strip fits the lining plate and uses the lining plate as a rigid support against the substrate. Multiple punches that are precisely aligned with the positions of the punching edge curling parts, such as large curling edges and small burrs, flatten the punching edge curling parts, such as large curling edges and small burrs, at one time point-to-point. The flattening of small areas instead of the large-scale rolling of the existing pressure rollers is highly targeted, accurately positioned, strong in pressure, and concentrated in force. It has a good effect on the flattening of the punching edge curling parts, such as large curling edges and small burrs, and relatively saves energy. In addition, the device is relatively small in size, which relatively saves equipment costs.

[0012] Furthermore, the structures of the first flattening mechanism and the second flattening mechanism are both as follows: a first cylinder is fixed on the frame away from the lining plate, the free end of the piston rod of the first cylinder is fixed with a horizontal slide that slides horizontally on the frame, the horizontal slide has an inclined long through hole, a first vertical slide slides vertically on the frame, one end of the first vertical slide is fixed with a sliding column that slides in the inclined long through hole to make the first vertical slide slide up and down under the drive of the horizontal slide, the other end of the first vertical slide is fixed to a punch mounting plate, a plurality of large punches and a plurality of small punches for flattening the downward turning portion or the upward turning portion of the punching edge are fixed on the punch mounting plate. After adopting the above structure, the first flattening mechanism and the second flattening mechanism are both simple in structure, stable and reliable in performance, further ensuring the technical effects of accurate positioning, strong pressure, concentrated force, good curling and burr punching and flattening effect, and relatively saving energy consumption and equipment cost.

[0013] Furthermore, the punch mounting plate includes a first mounting plate fixed to the other end of the first vertical slide and in a horizontal direction, and a second mounting plate away from the first vertical slide and in a horizontal direction; a plurality of guide columns are fixed on the first mounting plate; the plurality of large punches and the plurality of small punches are fixed on the second mounting plate, and the second mounting plate has a plurality of first guide holes for the plurality of guide columns to pass through; the lining plate includes a lining body and a guide plate fixed on the frame, the guide plate is located on the inner side of the lining body, and a copper strip channel for accommodating the copper strip and for the copper strip to move longitudinally between the lining body and the guide plate, and the guide plate has a plurality of second guide holes for the guide columns to slide up and down, a plurality of large punch guide holes for the plurality of large punches to slide up and down, and a plurality of small punch guide holes for the plurality of small punches to slide up and down. After adopting the above structure, it is easier to fix and install the large punch, small punch and guide column to the punch mounting plate, and it is easier to install and slide the large punch, small punch and guide column with the liner, such as sliding cooperation with the guide plate. It is also easier to cooperate with the punch mounting plate and the frame and fix the liner to the frame, making the up and down sliding of the large punch and the small punch more flexible, more stable and more reliable, and further ensuring the technical effects of accurate positioning, strong pressure, concentrated force, good curling and burr punching and flattening effect, and relatively saving energy.

[0014] Furthermore, the first mounting plate and the second mounting plate are both vertically slidably engaged on the frame; a plurality of compression springs are arranged between the first mounting plate and the second mounting plate, each compression spring being fitted onto a respective compression spring mounting post fixed to the first mounting plate, with both ends of the compression spring respectively abutting the first mounting plate and the second mounting plate, and the second mounting plate having compression spring mounting post holes for the compression spring mounting posts to slide up and down. With the above structure, the first mounting plate pushes the second mounting plate and drives the flushing action of the large and small punches to be more flexible, more stable, and more reliable. The compression springs can act as a buffer for the punch and the second mounting plate, preventing long-term direct impact that would affect the service life. This further ensures the technical effects of precise positioning, strong pressure, concentrated force, good curling and burr flushing and flattening effects, and relatively low energy consumption.

[0015] Furthermore, the first flattening mechanism is used to flatten the downwardly curled portion of the copper strip's punched edge, while the second flattening mechanism is used to flatten the upwardly curled portion of the copper strip's punched edge. This structure offers significant advantages: downwardly curled portions of the copper strip's punched edge, such as large downwardly curled edges and small downwardly curled burrs, are directly flattened and pressed against the strip's bottom surface by the punch, impacting upward from below. This prevents downwardly curled portions, such as large downwardly curled edges and small downwardly curled burrs, from rebounding and expanding. Similarly, upwardly curled portions of the copper strip's punched edge, such as large upwardly curled edges and small upwardly curled burrs, are directly flattened and pressed against the strip's top surface by the punch, impacting downward from above. This prevents upwardly curled portions, such as large upwardly curled edges and small upwardly curled burrs, from rebounding and expanding. Furthermore, during the actual flattening process, the first and second flattening mechanisms simultaneously flatten the upwardly curled and downwardly curled portions while simultaneously tightening the strip, significantly improving flattening efficiency. In addition, the first flattening mechanism adjacent to the copper belt driving wheel assembly is used to flatten the downward curling portion of the copper belt punching, such as the downward large curling edge and the downward small burr, so that the height of the entire device is relatively low at both ends and relatively high in the middle, which is convenient for installation and daily maintenance.

[0016] Furthermore, the copper strip tensioning mechanism includes a slide that slides longitudinally on the frame, a backing plate and a second vertical cylinder fixed to the slide. Above the backing plate is the free end of the piston rod of the second cylinder, which is used to compress or loosen the copper strip on top of the backing plate. A third horizontal cylinder, used to tighten the copper strip, has its cylinder body fixed to the frame and its free end fixed to the slide. This structure provides a simple copper strip tensioning mechanism, and the process of compressing and tightening the copper strip is stable, reliable, flexible, and labor-saving, further ensuring effective curling and flattening of curled edges and burrs while also saving energy.

[0017] Furthermore, the horizontal copper strip channel has a rectangular or C-shaped vertical cross-section, and the height of the copper strip channel is three to four times the thickness of the horizontal copper strip. This structure allows the copper strip's head to pass quickly and easily from the copper strip inlet, through the copper strip, and out the copper strip outlet. It also helps to initially close the copper strip's downward or upward curling edges, further ensuring that the large and small punches can simultaneously flush out curling edges and burrs.

[0018] Furthermore, the first motor and the copper belt driving wheel that drive the copper belt driving wheel to rotate are both installed on a second vertical slide, and the second vertical slide is slidably fitted on the frame. The frame has a fourth cylinder that drives the second vertical slide to rise so that the two rows of radial bosses on the circumference of the copper belt driving wheel are engaged into the two rows of regularly arranged waist-shaped through holes of the copper belt, or to descend so that the two rows of radial bosses on the circumference of the copper belt driving wheel are disengaged from the two rows of regularly arranged waist-shaped through holes of the copper belt; the top of the radial boss is a cone that is convenient for engaging into the waist-shaped through holes of the copper belt; a horizontal strip seat fixed on the frame is provided with a C-shaped copper belt channel opening upward, and a horizontal strip seat below the copper belt is provided with a long strip through hole extending along the length direction and for the two side plate wheels of the copper belt driving wheel to extend into so that the radial bosses engage with the waist-shaped holes. After adopting the above structure, the radial protrusion of the copper belt driving wheel can be engaged into the waist-shaped through hole of the copper belt according to the different needs of the stamping operation process to drive the copper belt forward or tighten the copper belt to flatten the curling and burrs, or to move the copper belt driving wheel away from the copper belt to facilitate the operation of the copper belt head end entering the copper belt channel from the copper belt inlet and passing through the copper belt outlet.

[0019] Furthermore, a second motor driving the winding drum to rotate is fixed on the frame, the central axis of the winding drum of the winding drum is fixed and coaxial with the motor shaft, an inner baffle is fixed on the central shaft, and a plurality of radially extending first roll-blocking claw plates are on the outer circle of the inner baffle, a central sleeve is axially slidable and circumferentially limited on the central shaft, and a plurality of connecting plates are fixed on the circumferential wall of the central sleeve at equal distances along the circumference, the number of connecting plates is the same as the number of arc plates, the inner side surface of each arc plate is hinged to each connecting plate through a pair of hinge plates, and the axial convex of the inner end of each arc plate The post extends into and slidably fits within an elongated through-hole extending along a radius in the inner baffle. Between the center sleeve and the central axis lies a rubber stop ring and a corresponding circular stop groove, which limit the multiple curved plates of the reel to their maximum diameter for winding the copper strip. The outer end of the connecting plate has a hook for attaching to it, allowing manual outward pull of the center sleeve to overcome the elastic force of the rubber stop ring, causing the center sleeve to move axially outward, thereby reducing the diameter of the reel formed by the multiple curved plates. Multiple second stop claw plates are detachably connected to the outer end of each curved plate. With this structure, the winding mechanism and the copper strip removal process are both simple, making the winding and removal processes convenient, stable, and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the preferred embodiment of the copper strip flattening and winding device of the present invention. Figure 1 ( Figures 1-10 The hinge pin, latch, bolts and nuts are not shown).

[0021] Figure 2 This is a schematic diagram of the structure of the preferred embodiment of the copper strip flattening and winding device of the present invention. Figure 2 .

[0022] Figure 3 It is a structural schematic diagram of the copper strip tightening mechanism in a preferred embodiment of the present invention.

[0023] Figure 4 It is a structural schematic diagram of the second flushing mechanism in a preferred embodiment of the present invention.

[0024] Figure 5 It is a structural schematic diagram of the first flushing mechanism in a preferred embodiment of the present invention.

[0025] Figure 6 yes Figure 5 Schematic diagram of the explosion structure Figure 1 .

[0026] Figure 7 yes Figure 5 Schematic diagram of the explosion structure Figure 2 .

[0027] Figure 8 Schematic diagram of the structure of the copper belt drive assembly in the preferred embodiment of the present invention (the horizontal strip seat is exploded).

[0028] Figure 9 yes Figure 8 The horizontal strip seat omits the two top plates and rotates 180 degrees to show a structural schematic diagram of two long strip through holes.

[0029] Figure 10 yes Figure 8 Schematic diagram of the enlarged structure after the copper strip in the figure is rotated at a different angle.

[0030] As shown in the figure:

[0031] 1. First base plate;

[0032] 2. Copper strip, 21. Punching hole, 211. Waist-shaped through hole, 212. Rectangular through hole;

[0033] 3. Flattening mechanism, 31. First flattening mechanism, 32. Second flattening mechanism, 33. Lining plate, 331. First rectangular copper strip channel, 332. Lining plate body, 3321. Third guide hole, 333. Guide plate, 3331. Second guide hole A, 3332. Large punch guide hole A, 3333. Small punch guide hole A, 34. First cylinder, 341. First piston rod, 3411. First free end, 35. Vertical plate, 351. Horizontal rectangular slide hole, 36. Horizontal slide, 361. Inclined long through hole, 37. First vertical slide, 3 8. Horizontal plate, 381. Vertical rectangular sliding hole, 39. Sliding column, 310. Punch mounting plate, 3101. First mounting plate, 3102. Second mounting plate, 31021. First guide hole, 31022. Compression spring mounting column hole, 311. Support frame, 312. Guide column, 313. Compression spring, 314. Large punch, 315. Small punch, 316. Fixed plate, 3161. Second guide hole B, 3162. Large punch guide hole B, 3163. Small punch guide hole B, 317. Waist-shaped vertical hole, 318. Compression spring mounting column;

[0034] 4. Copper belt drive wheel assembly, 41. Copper belt drive wheel frame, 411. Vertical slide rail, 42. Copper belt drive wheel, 421. Side plate wheel, 4211. Radial boss, 42111. Conical, 43. First motor, 44. Second vertical slide; 45. Horizontal strip seat, 451. C-shaped copper belt channel, 4511. Copper belt inlet, 452. Long strip through hole, 453. Top plate, 4531. Opening, 46. Fourth cylinder;

[0035] 5. Copper belt tensioning mechanism, 51. Copper belt tensioning mechanism frame, 511. Second rectangular copper belt channel, 5111. Copper belt outlet, 52. Slide, 53. Pad, 54. Second cylinder, 541. Sliding pressure block, 542. Cylinder seat, 5421. Vertical slide hole, 55. Third cylinder, 551. Cylinder body, 552. Third piston rod, 5521. Third free end;

[0036] 6. Winding mechanism, 61. Winding mechanism frame, 611. Second base plate, 62. Second motor, 63. Winding disc, 631. Reel, 6311. Center shaft, 6312. Center sleeve, 6313. Connecting plate, 63131. Hanging hole, 6314. Hinge plate, 6315. Arc plate, 63151. Axial boss, 632. Inner baffle, 6321. First gear rolling claw plate, 6322. Long through hole, 633. Second gear rolling claw plate, 6331. Socket, 64. Transition pulley. DETAILED DESCRIPTION

[0037] The following is a further description of specific embodiments of the present invention with reference to the accompanying drawings. It should be noted that the description of these specific embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. Furthermore, the technical features involved in the various specific embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0038] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 shown.

[0039] The present invention is titled "Apparatus for Flattening and Rewinding the Copper Strip Behind the Lead Frame of a Stamped Chip," and can also be described as a device for flattening and rewinding the copper strip behind the lead frame of a stamped chip. A preferred embodiment of the apparatus for flattening and rewinding the copper strip behind the lead frame of a stamped chip comprises a frame, a rewinding mechanism 6 with a structure for removing the copper strip roll, and a copper strip channel having a copper strip inlet 4511 and a copper strip outlet 5111.

[0040] Rack as Figure 1 From right to left, the copper belt drive wheel frame 41, the frame of the first flattening mechanism 31, the frame of the second flattening mechanism 32, the copper belt tensioning mechanism frame 51, and the winding mechanism frame 61 are shown. The copper belt drive wheel frame 41, the frame of the first flattening mechanism 31, and the frame of the second flattening mechanism 32 are collectively secured to the same elongated first base plate 1 via multiple bolts. This first base plate 1 can be secured to the floor using multiple anchor bolts. The winding mechanism frame 6 can be secured to the floor using a separate second base plate 611 via multiple anchor bolts.

[0041] The vertical cross-section of the horizontal copper belt channel can be rectangular or C-shaped. Rectangle is easy to understand, such as a horizontal rectangular copper belt channel whose length dimension is greater than the height dimension: such as the first rectangular copper belt channel 331 in the lining plate 33 of the first flattening mechanism 31 and the second flattening mechanism 32 and the second rectangular copper belt channel 511 on the copper belt tensioning mechanism 5. The C-shape is only a general shape. Strictly speaking, there is a gap on the top plate of the horizontal rectangle whose length dimension is greater than the height dimension, and the width dimension of the gap is narrower than the width dimension of the copper belt 2, such as the C-shaped copper belt channel 451 on the top of the copper belt drive wheel frame 41 outside the right end of the first flattening mechanism 31. The height dimension of the copper belt channel, including rectangular copper belt channels such as the first rectangular copper belt channel 331 and the second rectangular copper belt channel 511 and the C-shaped copper belt channel 451, can be 3 to 4 times the thickness dimension of the horizontal copper belt 2. If the thickness of the copper belt is 2 mm, the thickness of the copper belt channel can be 6 mm-8 mm. The copper belt 2 extends horizontally along the longitudinal direction at the same time. Such as Figure 1 As shown, the copper belt inlet 4511 can be located at the right end of the C-shaped copper belt channel 451 on the top of the copper belt driving wheel frame 41, and the copper belt outlet 5111 can be located at the left end of the second rectangular copper belt channel 511 on the copper belt tensioning mechanism 5.

[0042] There is a first flattening mechanism 31 on the frame adjacent to the copper belt drive wheel assembly 4, such as the first base plate 1, which includes a lining plate 33 and multiple punches and is used to flatten the curled edge portion of the punched hole 21 of the copper belt 2. The first flattening mechanism 31 can be a flattening mechanism for flattening the downward curled edge portion of the punched hole 21 of the copper belt 2, such as a large downward curl and a small downward burr.

[0043] A second flattening mechanism 32 is located adjacent to the first flattening mechanism 31 on a frame such as the first base plate 1. The second flattening mechanism 32 includes a liner 33 and multiple punches and is used to flatten the curled portions of the edges of the punched holes 21 of the copper strip 2. The second flattening mechanism 32 can be used to flatten the upward curled portions of the edges of the punched holes 21 of the copper strip 2, such as large upward curling edges and small upward burrs. The first flattening mechanism 31 and the second flattening mechanism 32 can be collectively referred to as the flattening mechanism 3.

[0044] It is not difficult to understand that when punching the curled portion of the edge of the punching hole 21, such as a large curled edge, the curled edge is generally pressed tightly against the copper strip 2 and flattened, and when punching the curled portion of the edge of the punching hole 21, such as a small burr, the burr is flush with the copper strip or pressed tightly against the copper strip 2 and flattened.

[0045] The edges of the punching holes 21 are such as the waist-shaped through holes 211 on both sides of the width of the copper strip 2 or the edges of the waist-shaped holes and the rectangular through holes 212 in the middle of the width of the copper strip 2 or the edges of the rectangular holes.

[0046] The specific structures of the flushing mechanism 3, i.e. the first flushing mechanism 31 and the second flushing mechanism 32, can be:

[0047] A first cylinder 34 is fixed to the first base plate 1 of the frame. The free end of the first piston rod 341 of the first cylinder 34, referred to as the first free end 3411, is secured to a horizontal slide 36 that slides horizontally within rectangular sliding holes 351 in the two vertical plates 35 of the frame. The horizontal slide 36 can be rectangular, and its length can be greater than its height, and its height can be greater than its thickness. The first free end 3411 is secured to the horizontal slide 36, for example, by a T-shaped plug and a T-shaped slot. The horizontal slide 36 has an inclined elongated through-hole 361. A first rectangular vertical slide 37 slides vertically within a rectangular sliding hole 381 in a horizontal plate 38 of the frame. A sliding post 39 is secured to one end of the first vertical slide 37, such as the lower end of the first flattening mechanism 31 or the upper end of the second flattening mechanism 32, and slides within the inclined elongated through-hole 361. This allows the first vertical slide 37 to slide up and down under the drive of the horizontal slide 36. The other end of the first vertical slide 37, such as the upper end in the first flattening mechanism 31 or the lower end in the second flattening mechanism 32, is fixed to a punch mounting plate 310, for example, by welding or screwing. The punch mounting plate 310 is secured with a plurality of large punches 314 for flattening the downwardly turned portion of the edge of the punch hole 21, such as a large downwardly curled edge, and a plurality of small punches 315 for flattening the downwardly turned portion of the edge of the punch hole 21, such as a large downwardly curled edge. Alternatively, the punch mounting plate 310 is secured with a plurality of large punches 314 for flattening the upwardly turned portion of the edge of the punch hole 21, such as a large upwardly curled edge, and a plurality of small punches 315 for flattening the upwardly turned portion of the edge of the punch hole 21, such as a large upwardly curled edge. It is understood that the large punches 314 and the small punches 315 are capable of punching all the turned portions of the edges of the two waist-shaped through holes 211 on both sides of the copper strip 2 and the rectangular through hole 212 in the middle, from a cross-sectional view. The two vertical plates 35 perpendicular to the two vertical plates 35 with the horizontal rectangular sliding holes 351 can be provided with a respective waist-shaped vertical hole 317 to facilitate operation and avoid interference with the sliding column 39. The waist-shaped vertical hole 317 can also be called a vertical waist-shaped hole.

[0048] The punch mounting plate 310 includes a first mounting plate 3101 fixed, such as by welding, to the other end of the first vertical slide 37, such as the upper end of the first vertical slide 37 in the first flattening mechanism 31, or the lower end of the first vertical slide 37 in the second flattening mechanism 32, and in a horizontal direction, and a second mounting plate 3102 away from the first vertical slide 37 and in a horizontal direction. In the first flattening mechanism 31, the first mounting plate 3101 is located at the lower part, and the second mounting plate 3102 is located at the upper part of the first mounting plate 3101. In the second flattening mechanism 32, the first mounting plate 3101 is located at the upper part, and the second mounting plate 3102 is located at the lower part of the first mounting plate 3101. The first mounting plate 3101 and the second mounting plate 3102 are both vertically slidably fitted on the frame. There are multiple compression springs 313 between the first mounting plate 3101 and the second mounting plate 3102. Each compression spring 313 is fitted onto its own compression spring mounting column 318 fixed on the first mounting plate 3101. The two ends of the compression spring 313 respectively abut against the first mounting plate 3101 and the second mounting plate 3102. The second mounting plate 3102 is provided with a compression spring mounting column hole 31022 for the compression spring mounting column 318 to slide up and down.

[0049] For ease of manufacture and installation, the first mounting plate 3101 can be composed of two upper and lower plates, which can be screwed together using screws and threaded holes to form the first mounting plate 3101. The second mounting plate 3102 can also be composed of two upper and lower plates, which can be screwed together using screws and threaded holes to form the second mounting plate 3102.

[0050] A plurality of guide posts 312 are fixed on the first mounting plate 3101. The plurality of large punches 314 and the plurality of small punches 315 are fixed on the second mounting plate 3102. The second mounting plate 3102 has a plurality of first guide holes 31021 for the plurality of guide posts 312 to pass through.

[0051] The lining plate 33 comprises a lining plate body 332 fixed to a horizontal fixing plate 316 of the frame, and a guide plate 333. The guide plate 333 is located on the inner side of the lining plate body 332, i.e., the lower side of the first flattening mechanism 31 and the upper side of the second flattening mechanism 32. The lining plate body 332 may also be provided with multiple, for example, four, third guide holes 3321 for the guide posts 312 to slide up and down. A copper strip channel, such as the first rectangular copper strip channel 331, is provided between the lining plate body 332 and the guide plate 333 to accommodate the longitudinal and horizontal linear movement of the copper strip 2. Both the guide plate 333 and the fixing plate 316 are provided with multiple, for example, four, second guide holes for the vertical movement of multiple, for example, four, guide posts 312; multiple, for example, two large punch guide holes for the vertical movement of multiple, for example, two large punches 314; and multiple, for example, eight small punch guide holes for the vertical movement of multiple, for example, eight small punches 315. The fixed plate 316 described above can be referred to as the top plate in the first flattening mechanism 31 and as the bottom plate in the second flattening mechanism 32. It is readily understood that the vertical positional relationship between the fixed plate 316, the liner body 332, and the guide plate 333 is as follows: in the first flattening mechanism 31, the fixed plate 316 is at the bottom and fixed to the frame of the first flattening mechanism 31, the guide plate 333 is in the middle and fixed to the fixed plate 316, and the liner body 332 is at the top and fixed to the guide plate 333. In the second flattening mechanism 32, the fixed plate 316 is at the top and fixed to the frame of the second flattening mechanism 32, the guide plate 333 is in the middle and fixed to the fixed plate 316, and the liner body 332 is at the bottom and fixed to the guide plate 333. The second guide hole on the guide plate 333 can be called the second guide hole A and can be labeled 3331. The large punch guide hole on the guide plate 333 can be called the large punch guide hole A and can be labeled 3332. The small punch guide hole on the guide plate can be called the small punch guide hole A and can be labeled 3333. The second guide hole on the fixed plate 316 can be called the second guide hole B and can be labeled 3161. The large punch guide hole on the fixed plate 316 can be called the large punch guide hole B and can be labeled 3162. The small punch guide hole on the fixed plate 316 can be called the small punch guide hole B and can be labeled 3163.

[0052] The frames described in the above four paragraphs can be understood as follows: the horizontal slide 36, the first vertical slide 37, the first mounting plate 3101, the second mounting plate 3102, the lining plate 33 and other components installed on the first flattening mechanism 31 refer to the frame of the first flattening mechanism 31; the horizontal slide 36, the first vertical slide 37, the first mounting plate 3101, the second mounting plate 3102, the lining plate 33 and other components installed on the second flattening mechanism 32 refer to the frame of the second flattening mechanism 32.

[0053] It is easy to understand that the first and second leveling mechanisms 31 and 32 have exactly the same structure, except that their directions are exactly opposite. For example, the first piston rod 341 of the first cylinder 34 of the first leveling mechanism 31 is directed upward, while the first piston rod 341 of the first cylinder 34 of the second leveling mechanism 32 is directed downward. Unlike the first leveling mechanism 31, a rectangular support frame 311 can be provided between the second leveling mechanism 32 and the first base plate 1. Alternatively, the frame of the second leveling mechanism 32 can have one more support frame 311 than the frame of the first leveling mechanism 31 of the first leveling mechanism 31. It is easy to understand that the frames of the first and second leveling mechanisms 31 and 32 both include two vertical plates 35, a horizontal plate 38, and a fixed plate 316. The support frame 311 can also be considered as part of the frame of the second leveling mechanism 32.

[0054] The front end of the frame such as the first base plate 1 is as Figure 1 The right end shown in FIG. 1 has a copper belt drive pulley assembly 4. The copper belt drive pulley 42 in the copper belt drive pulley assembly 4 has a plurality of radial protrusions 4211 arranged circumferentially and engaging with the plurality of punched holes 21 in the copper belt 2. A copper belt tensioning mechanism 5 is provided at the rear end of the frame, such as the first base plate 1, for compressing and tightening the copper belt 2 when the copper belt drive pulley 42 stops rotating.

[0055] like Figure 3 As shown, the copper strip tensioning mechanism 5 includes a slide 52 that slides longitudinally and horizontally onto a horizontal slide rail of a slide seat of a frame, such as the copper strip tensioning mechanism frame 51. The top of the inverted T-shaped copper strip tensioning mechanism frame 51 also serves as the slide seat, the top surface of the slide seat serving as the slide rail, and the bottom surface of the slide 52 serving as a slide groove that mates with the slide rail, such as a dovetail rail and dovetail groove (not shown). A backing plate 53 and a vertical second cylinder 54 are fixed to the slide 52. Above the backing plate 53 is the free end of the piston rod of the second cylinder 54, or the piston rod of the second cylinder 54, for compressing or loosening the copper strip 2 on the top surface of the backing plate 53. The following specific structure can be employed: a vertical sliding pressure block 541 can be fixed to the free end of the piston rod of the second cylinder 54. The sliding pressure block 541 slidably engages within a vertical sliding hole 5421 of a cylinder seat 542 fixed to the slide 52. The piston rod of the second cylinder 54 may be referred to as a second piston rod, and the free end thereof may be referred to as a second free end.

[0056] like Figure 3 As shown, the cylinder body 551 of the third horizontal cylinder 55 for tightening the copper strip 2 is fixed to a frame, such as the slide of the copper strip tightening mechanism frame 51, that is, fixed to the copper strip tightening mechanism frame 51. The free end of the third piston rod 552 of the third cylinder 55, also referred to as the third free end 5521, is fixed to the slide 52. The slide 52 slides both longitudinally and horizontally.

[0057] like Figure 8 and Figure 9As shown, in the copper belt driving wheel assembly 4, the first motor 43 that drives the copper belt driving wheel 42 to rotate and the copper belt driving wheel 42 are both installed on a second vertical slide 44, and the second vertical slide 44 is slidably fitted on a vertical slide rail 411 of a frame such as a copper belt driving wheel frame 41. There is a fourth cylinder 46 on the first bottom plate 1 of the frame for driving the second vertical slide 44 to rise so that the two rows of radial bosses 4211 on the circumference of the two side plate wheels 421 of the copper belt driving wheel 42 are engaged into the two rows of regularly arranged punching holes 21 of the copper belt 2, such as the waist-shaped through holes 211, or to descend so that the two rows of radial bosses 4211 on the circumference of the two side plate wheels 421 of the copper belt driving wheel 42 are disengaged from the two rows of regularly arranged punching holes 21 of the copper belt 2, such as the waist-shaped through holes 211. The above can be expressed in other words: a fourth cylinder 46 is provided on the first bottom plate 1 of the frame for driving the second vertical slide 44 upward or downward. The second vertical slide 44 ascends, driving the copper belt drive wheel 42 upward, and causing the two rows of radial protrusions 4211 on the circumference of the two side plate wheels 421 of the copper belt drive wheel 42 to engage with the two rows of regularly arranged punched holes 21, such as the waist-shaped through holes 211, in the copper belt 2, thereby driving the copper belt 2 forward longitudinally and horizontally. Or, when stopped, the second vertical slide 44 cooperates with the copper belt tensioning mechanism 5 to tighten the copper belt 2 to flatten the edges of the punched holes 21. The second vertical slide 44 descends, driving the copper belt drive wheel 42 downward, causing the two rows of radial protrusions 421 on the circumference of the two side plate wheels 421 of the copper belt drive wheel 42 to disengage from the two rows of regularly arranged punched holes 21, such as the waist-shaped through holes 211, in the copper belt 2, thereby facilitating the leading end of the copper belt 2 to pass through the copper belt passage from the copper belt inlet 4511 and exit from the copper belt outlet 5111. The top of the radial protrusion 421, such as a radial protrusion 421 with a square cross-section, is tapered 4211 to facilitate engagement with the waist-shaped through-hole 211 of the copper strip 2. The tapered portion 4211 may also be referred to as a tapered section or a tapered portion. A horizontal strip seat 45 secured to a frame, such as the frame of the first flattening mechanism 31, includes a C-shaped copper strip passage 451 with an upward-facing opening 4531. The horizontal strip seat 45 below the copper strip 2 includes two parallel elongated through-holes 452 extending along its length and into which the two side plate wheels 421 of the copper strip drive wheel 42 extend, allowing the radial protrusion 421 to engage with the waist-shaped through-hole 211. It is not difficult to understand that above the two long strip through holes 452 is the C-shaped copper strip channel 451, and the top surface of the C-shaped copper strip channel 451 has two top plates 453. The two top plates 453 are both located directly above their respective long strip through holes 452, and there is an opening 4531 or a gap extending along the length direction between the two top plates 453.

[0058] like Figure 1 and Figure 2 shown.

[0059] The specific structure of the winding mechanism 6 can be as follows: the second motor 62 that drives the winding disk 63 to rotate is fixed on a frame such as the winding mechanism frame 61, the central axis 6311 of the reel 631 of the winding disk 63 is fixed and coaxial with the motor axis of the second motor 62, an inner baffle 632 is fixed on the central axis 6311, and a plurality of radially extending first roll-blocking claw plates 6321, such as four, are provided on the outer circle of the inner baffle 632. A central sleeve 6312 is provided on the central axis 6311 for axial sliding and circumferential limit movement, and a plurality of connecting plates 6313, such as four, are fixed on the circumferential wall of the central sleeve 6312 at equal distances along the circumference to connect The number of plates 6313 is the same as the number of curved plates 6315. For example, there are also four curved plates 6315. The inner side surface of each curved plate 6315 is hinged to each connecting plate 6313 via a pair of hinged plates 6314. The axial protrusion 63151 at the inner end of each curved plate 6315 extends into and slides into an elongated through hole 6322 extending along the radius line of the inner baffle 632. Between the center sleeve 6312 and the center shaft 6311, there is a rubber limiting ring and a matching circular limiting groove that limit the multiple pieces of the reel 631, such as the four curved plates 6315, at the position with the largest diameter and used to wind up the copper strip 2. The outer ends of the connecting plates 6313 have a hook for attaching to the center sleeve 6312, manually pulling it outward to overcome the elastic force of the rubber stop ring, causing the center sleeve 6312 to move axially outward, thereby reducing the diameter of the reel. This attachment structure, such as a pair of attachment holes 63131, is provided on two symmetrical connecting plates 6313. The outer ends of each curved plate 6315 are detachably connected to multiple, for example, four, second reel-stop plates 633. The detachable attachment structure can be conventional, such as two insertion holes 6331 at the base of each second reel-stop plate 633, or two insertion holes at the outer ends of each curved plate. Two latches are inserted into their corresponding insertion holes with an interference fit to secure the reel. To remove the copper coil, the multiple second reel-stop plates 633 can be removed by gently pulling out the latches. Screws, screw holes, or threaded holes can also be used in place of the latches. It is easy to understand that the number of the first rolling claw plates 6321 and the second rolling claw plates 633 can be equal, for example, four, and each pair of the first rolling claw plates 6321 and the second rolling claw plates 633 are located at both ends of the same arc-shaped plate 6315. The shapes of the first rolling claw plates 6321 and the second rolling claw plates 633 can be substantially the same.

[0060] There may be multiple transition pulleys 64 between the copper strip outlet 5111 and the winding reel 63 of the winding mechanism 6 .

[0061] The winding mechanism 6 may also include a structure for removably securing the leading end of the copper strip 2. For example, a radial protrusion may be secured to the outer surface of a curved plate, and the leading end of the copper strip may have a hanging hole that engages with the radial protrusion. When winding, the copper strip is locked in place. When removing the copper strip, the diameters of the multiple, e.g., four, curved plates of the reel shrink, allowing the radial protrusion to naturally disengage from the hanging hole at the leading end of the copper strip. Alternatively, the leading end of the copper strip may have a 90° bend that engages within a waist-shaped through-hole extending along the width of a curved plate, allowing normal winding. When removing the copper strip, the diameters of the four curved plates of the reel shrink, allowing the leading end of the copper strip to be disengaged from the curved plates by pushing against them with a tool such as a screwdriver.

[0062] When the rolled copper coil needs to be taken out, a pair of hooks can be used to hook the pair of hanging holes 63131 on the connecting plate 6313 to overcome the elastic force of the axial limit of the rubber limit ring and pull it outward in the opposite direction of the inner baffle 632. At this time, the axial protrusions 63151 at the inner end of the arc plate 6315 all slide along the elongated through holes 6322 on the inner baffle 632 toward the center of the inner baffle 632, so that the diameters of multiple pieces of the reel 631, such as four arc plates 6315, shrink and become smaller. Then, the copper coil can be removed by removing the respective pins and removing the four second roll-blocking claw plates 633.

[0063] It is easy to understand that the terms liner 33 and pad 53 are interchangeable, and liner 33 can also be called an anvil. The large punch 314, the small punch 315, the liner 33, and the pad 53 are all made of steel. That is, except for the motor and cylinder, which are purchased from outside, all other parts of this device can be made of steel. The copper belt drive wheel 42 can also be regarded as a ratchet. The radial boss 421 can also be called a radial convex tooth. The structure in which the center shaft 6311 and the center sleeve 6312 slide axially and are circumferentially limited can adopt the spline and spline groove structures of the existing technology. The above-mentioned fixation can be welded or screwed. This device can also include a main controller such as a PLC chip or a computer, which is electrically connected to all cylinders and all motors, and controls their operation. The motor can include a variable speed gearbox, or it can use a self-variable speed motor such as a servo motor or a stepper motor.

[0064] Parts, structures, quantities, etc. not marked above are not shown in the drawings, and some parts are not marked in the drawings. The drawings are for illustration only. If there is any inconsistency between the drawings and the text description or between the drawings, the text description shall prevail.

[0065] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A copper strip flattening and reeling device for stamping a lead frame of a chip, comprising a frame, a reeling mechanism with a structure for removing the copper strip roll, and a copper strip channel with a copper strip inlet and a copper strip outlet; characterized in that: A copper belt driving wheel assembly is provided at the front end of the frame. A plurality of radial protrusions are arranged on the circumferential surface of the copper belt driving wheel in the copper belt driving wheel assembly and are arranged at intervals along the circumference and engage with a plurality of punched holes in the copper belt; a copper belt tensioning mechanism is provided at the rear end of the frame for pressing and tightening the copper belt when the copper belt driving wheel stops rotating; A first flattening mechanism is provided on the frame adjacent to the copper belt driving wheel assembly and includes a lining plate and a plurality of punches for flattening the rolled portion of the copper belt punching edge. A second flattening mechanism is provided on a machine frame adjacent to the first flattening mechanism and comprises a lining plate and a plurality of punches and is used for flattening the rolled portion of the punched edge of the copper strip.

2. The copper strip flattening and winding device after punching the lead frame of the chip according to claim 1, characterized in that: The structures of the first flattening mechanism and the second flattening mechanism are: a first cylinder is fixed on the frame away from the liner, the free end of the piston rod of the first cylinder is fixed with a horizontal slide that slides horizontally on the frame, the horizontal slide has an inclined long through hole, a first vertical slide slides vertically on the frame, one end of the first vertical slide is fixed with a sliding column that slides in the inclined long through hole to make the first vertical slide slide up and down under the drive of the horizontal slide, the other end of the first vertical slide is fixed to a punch mounting plate, and the punch mounting plate is fixed with a plurality of large punches and a plurality of small punches for flattening the downward flipping portion or the upward flipping portion of the punching edge.

3. The copper strip flattening and winding device after stamping the lead frame of the chip according to claim 2, characterized in that: The punch mounting plate includes a first mounting plate fixed to the other end of the first vertical slide and in a horizontal direction, and a second mounting plate away from the first vertical slide and in a horizontal direction; a plurality of guide columns are fixed on the first mounting plate; the plurality of large punches and the plurality of small punches are fixed on the second mounting plate, and the second mounting plate has a plurality of first guide holes for the plurality of guide columns to pass through; the lining plate includes a lining body and a guide plate fixed on the frame, the guide plate is located on the inner side of the lining body, and a copper strip channel for accommodating the copper strip and for the copper strip to move longitudinally between the lining body and the guide plate, and the guide plate has a plurality of second guide holes for the guide columns to slide up and down, a plurality of large punch guide holes for the plurality of large punches to slide up and down, and a plurality of small punch guide holes for the plurality of small punches to slide up and down.

4. The copper strip flattening and winding device after punching the lead frame of the chip according to claim 3, characterized in that: The first mounting plate and the second mounting plate are both vertically slidably fitted on the frame; there are multiple compression springs between the first mounting plate and the second mounting plate, each compression spring is fitted on its own compression spring mounting column fixed on the first mounting plate, and the two ends of the compression spring respectively abut against the first mounting plate and the second mounting plate, and the second mounting plate is provided with a compression spring mounting column hole for the compression spring mounting column to slide up and down.

5. The copper strip flattening and winding device after punching the lead frame of the chip according to claim 4, characterized in that: The first flattening mechanism is used to flatten the downwardly rolled portion of the punched edge of the copper strip; the second flattening mechanism is used to flatten the upwardly rolled portion of the punched edge of the copper strip.

6. The copper strip flattening and winding device after stamping the lead frame of the chip according to claim 1, characterized in that: The copper strip tensioning mechanism includes a slide that is longitudinally slidably fitted on the frame, a pad and a vertical second cylinder are fixed on the slide, and the free end of the piston rod of the second cylinder for tightening or loosening the copper strip on the top surface of the pad is provided above the pad. The cylinder body of the horizontal third cylinder for tightening the copper strip is fixed to the frame, and the free end of the piston rod is fixed to the slide.

7. The copper strip flattening and winding device after punching the lead frame of the chip according to claim 1, characterized in that: The vertical cross-section of the horizontal copper belt channel is rectangular or C-shaped; the height of the copper belt channel is 3 to 4 times the thickness of the horizontal copper belt.

8. The copper strip flattening and winding device after stamping the lead frame of the chip according to claim 1, characterized in that: The first motor and the copper belt driving wheel that drive the copper belt driving wheel to rotate are both installed on a second vertical slide, and the second vertical slide is slidably matched on the frame. The frame has a fourth cylinder that drives the second vertical slide to rise so that the two rows of radial bosses on the circumference of the copper belt driving wheel are engaged into the two rows of regularly arranged waist-shaped through holes in the copper belt, or to descend so that the two rows of radial bosses on the circumference of the copper belt driving wheel are disengaged from the two rows of regularly arranged waist-shaped through holes in the copper belt; the top of the radial boss is a cone that is convenient for engaging into the waist-shaped through holes in the copper belt; a horizontal strip seat fixed on the frame is provided with a C-shaped copper belt channel that opens upward, and the horizontal strip seat below the copper belt is provided with two long strip through holes extending along the length direction and for the two side plate wheels of the copper belt driving wheel to extend into so that the radial bosses engage the waist-shaped holes and are parallel to each other.

9. The copper strip flattening and winding device after stamping the lead frame of the chip according to claim 1, characterized in that: The second motor driving the winding disk to rotate is fixed on the frame, the central axis of the winding disk drum is fixed and coaxial with the motor shaft, an inner baffle is fixed on the central axis, and a plurality of radially extending first roll-blocking claw plates are on the outer circle of the inner baffle, a central sleeve is axially sliding and circumferentially limited on the central axis, and a plurality of connecting plates are fixed on the circumferential wall of the central sleeve at equal distances along the circumference, and the number of connecting plates is the same as the number of arc plates, the inner side surface of each arc plate is hinged to each connecting plate through a pair of hinge plates, and the axial protrusion at the inner end of each arc plate extends into It slides into an elongated through hole extending along the radius line of the inner baffle. Between the center sleeve and the center axis, there is a rubber limiting ring and a matching circular limiting groove that limit the multiple curved plates of the reel to the position with the largest diameter and used to reel in the copper strip; the outer end of the connecting plate has a hanging structure for hanging a hook and manually pulling the center sleeve outward to overcome the elastic force of the axial limitation of the rubber limiting ring and make the center sleeve move axially outward to reduce the diameter of the multiple curved plates of the reel; the outer end of each curved plate is detachably connected to multiple second reel claw plates.

Images