Automatic feeding and discharging device of lead frame magazine

Abstract

This invention discloses an automatic feeding and unloading device for lead frame cassettes, belonging to the field of semiconductor packaging. It includes a controller, a worktable, a cassette holder for placing lead frame cassettes, an unloading machine mounted on the worktable, and a lifting assembly for moving the cassette holder up and down above the worktable. It also includes a feeding machine; the feeding machine is mounted on the worktable, and the feeding and unloading machines are respectively located on both sides of the cassette holder, used to transport lead frames one by one into the lead frame cassette. By incorporating a feeding machine, after the lead frames are stamped by the press, they can be fed one by one into the liftable lead frame cassette, eliminating the need for manual placement of the lead frames. This automatic feeding operation improves operational efficiency and reduces the labor intensity of operators.

Description

Technical Field

[0001] This invention relates to the field of semiconductor packaging technology, and in particular to an automatic feeding and discharging device for lead frame cassettes. Background Technology

[0002] As a chip carrier for integrated circuits, the lead frame is a key structure 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, thereby forming an electrical circuit. It plays the role of a bridge connecting with 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] Leadframes are formed by stamping using a press, and then placed into a specialized leadframe cassette for production, protection, and handling on relevant equipment. While existing leadframe cassettes are equipped with pushers to guide the leadframes to the work tracks of semiconductor component bonding and wire bonding equipment, the leadframes still need to be manually placed into the cassette after stamping, resulting in low efficiency and high labor intensity.

[0004] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an automatic feeding and discharging device for lead frame material boxes, which aims to solve the problems of low efficiency and high labor intensity caused by the need to manually put lead frames into lead frame material boxes.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An automatic feeding and discharging device for a lead frame material box includes a worktable, a controller, a material box bracket, a discharging machine, and a lifting assembly connected to the material box bracket; the lifting assembly is used to move the material box bracket up and down above the worktable; it also includes:

[0008] The feeder is located on the workbench, and the feeder and the discharger are respectively located on both sides of the material box bracket, and are used to transport the lead frame one by one to the lead frame material box.

[0009] In the automatic feeding and discharging device for the lead frame material box, the feeder includes:

[0010] The first frame is mounted on the workbench;

[0011] A conveyor belt, wherein two conveyor belts are mounted on the first frame and are arranged in parallel;

[0012] A pusher assembly is disposed between two conveyor belts and above the output end of the conveyor belts, and is used to push the lead frame into the lead frame material box.

[0013] In the automatic feeding and discharging device for the lead frame material box, the pushing assembly includes a first pushing plate and further includes:

[0014] A first driving mechanism, wherein the output shaft of the first driving mechanism is connected to the first push plate via a transmission, and

[0015] The first drive mechanism is used to drive the first push plate to move up and down;

[0016] The second drive mechanism is used to drive the first drive mechanism to reciprocate horizontally.

[0017] In the automatic feeding and discharging device for the lead frame material box, the pushing component further includes:

[0018] The first probe is fixed above the input ends of the two conveyor belts;

[0019] The second probe is fixed on the first push plate.

[0020] In the automatic feeding and discharging device for the lead frame material box, the feeder further includes:

[0021] A support plate is provided between two conveyor belts along the length of the first frame, and the upper surface of the support plate is at the same height as the conveying surface of the conveyor belt.

[0022] In the automatic feeding and discharging device for the lead frame material box, the material box bracket is U-shaped, and racks are vertically fixed on the outer walls of both sides of the material box bracket; the lifting assembly includes:

[0023] The second frame is fixed on the workbench;

[0024] The third drive mechanism is fixed on the second frame;

[0025] The gear is connected to the output shaft of the third drive mechanism and meshes with a rack.

[0026] In the automatic feeding and discharging device for the lead frame material box, multiple limiting rods are vertically provided on the outer walls of both sides of the material box bracket; the second frame includes:

[0027] Two sets of guide rods are located on both sides of the material box bracket, and each guide rod is provided with a limiting groove that cooperates with the limiting rod.

[0028] In the automatic feeding and discharging device for the lead frame material box, the lifting assembly further includes:

[0029] Two third probes are respectively located at the upper and lower parts of the guide rod, and the third probes are electrically connected to the controller;

[0030] An alarm, which is electrically connected to a controller.

[0031] In the automatic feeding and discharging device of the lead frame material box, the discharging machine includes:

[0032] A linear module, which is fixed above the worktable;

[0033] A connecting rod, which is parallel to the linear module and connected to a slide on the linear module;

[0034] The second push plate is located at the end of the connecting rod.

[0035] In the automatic feeding and discharging device of the lead frame material box, the discharging machine further includes a fourth probe and a fifth probe;

[0036] The fourth and fifth probes are respectively mounted on the linear module and are used to detect the slide on the linear module.

[0037] Beneficial effects:

[0038] This invention provides an automatic feeding and discharging device for a lead frame material box. By setting up a feeding machine, after the lead frame is stamped and formed by the stamping machine, the lead frame can be fed one by one into the liftable lead frame material box through the feeding machine. Therefore, it is not necessary to manually put the lead frame into the lead frame material box, and the feeding operation of the lead frame material box can be automatically realized, thus improving the operating efficiency and reducing the labor intensity of the operators.

[0039] Furthermore, by positioning the feeder and discharge machine on opposite sides of the lead frame holder, the present invention allows the lead frame to enter the feeder when it is pushed out of the lead frame box. This enables the lead frame to be transported to semiconductor device bonding and wire bonding equipment via the feeder. As a result, the automatic feeding and discharging device for the lead frame box provided by the present invention not only improves production efficiency but also offers multiple functions and greater flexibility. It can be installed at the lead frame stamping machine and at the semiconductor device bonding and wire bonding equipment. Attached Figure Description

[0040] Figure 1 Schematic diagram of the automatic feeding and discharging device for the lead frame material box provided by the present invention Figure 1 .

[0041] Figure 2 This is a schematic diagram of the feeder structure. Figure 1 .

[0042] Figure 3 for Figure 2 Enlarged view of part A in the middle.

[0043] Figure 4 This is a schematic diagram of the feeder structure. Figure 2 .

[0044] Figure 5 for Figure 4 Enlarged view of section B.

[0045] Figure 6 Schematic diagram of the automatic feeding and discharging device for the lead frame material box provided by the present invention Figure 2 .

[0046] Figure 7 for Figure 6 Enlarged view of section C.

[0047] Figure 8 Schematic diagram of the automatic feeding and discharging device for the lead frame material box provided by the present invention Figure 3 .

[0048] Figure 9 for Figure 8 Enlarged view of section D.

[0049] Figure 10 This is a structural schematic diagram of the material box bracket.

[0050] Figure 11 Schematic diagram of the automatic feeding and discharging device for the lead frame material box provided by the present invention Figure 4 .

[0051] Figure 12 for Figure 11 Enlarged view of section E in the middle.

[0052] Figure 13 This is a schematic diagram of the structure of the discharge machine.

[0053] Figure 14 for Figure 13 Enlarged view of section F in the middle.

[0054] Figure label:

[0055] 1-Workbench; 2-Leader frame material box; 3-Material box bracket;

[0056] 4-Discharge machine; 41-Linear module; 411-Slide table; 42-Connecting rod; 43-Second push plate; 44-Fourth probe; 45-Fifth probe;

[0057] 5-Lifting assembly; 51-Second frame; 511-Limit groove; 52-Third drive mechanism; 53-Third probe; 54-Gear;

[0058] 6-Feeder; 61-First frame; 62-Conveyor belt; 63-Pushing assembly; 631-First push plate; 632-First drive mechanism; 633-Second drive mechanism; 634-Second probe; 635-Hanging rod; 636-Positioning rod; 637-Positioning cylinder; 64-Support plate; 65-Guide baffle; 66-First probe;

[0059] 7-Rack; 8-Limit rod; 9-Leader frame. Detailed Implementation

[0060] This invention provides an automatic feeding and discharging device for a lead frame material box. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0061] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0062] like Figure 1 As shown, the present invention provides an automatic feeding and discharging device for lead frame material boxes. This device can be installed at the lead frame 9 stamping machine or at the location of semiconductor component bonding, wire bonding, or other equipment. Specifically, it includes a controller, a worktable 1, a material box bracket 3 for placing the lead frame material box 2, a discharging machine 4 mounted on the worktable 1, and a lifting assembly 5 for moving the material box bracket 3 up and down above the worktable 1; it also includes:

[0063] The feeder 6 is located on the workbench 1, and the feeder 6 and the discharger 4 are respectively located on both sides of the material box bracket 3, and are used to transport the lead frame 9 one by one to the lead frame material box 2.

[0064] By setting up a feeder 6, after the lead frame 9 is stamped and formed by the stamping machine, the lead frame 9 can be fed one by one into the liftable lead frame material box 2 through the feeder 6. Therefore, it is not necessary to manually put the lead frame 9 into the lead frame material box 2. The feeding operation of the lead frame material box 2 can be automatically realized, thus improving the operating efficiency and reducing the labor intensity of the operators.

[0065] like Figure 2 as well as Figures 4-7 As shown, in one embodiment, the feeder 6 includes a first frame 61, two conveyor belts 62, and a pusher assembly 63.

[0066] Specifically, the first frame 61 is mounted on the workbench 1; two conveyor belts 62 are respectively mounted on the first frame 61, and the two conveyor belts 62 are parallel to each other for conveying the lead frame 9; the discharge machine 63 is located between the two conveyor belts 62 and above the output end of the conveyor belts 62, and the pushing component 63 is used to push the lead frame 9. In this way, when the end of the lead frame 9 outside the lead frame box 2 reaches the output end of the conveyor belt 62, it can be ensured that the lead frame 9 can still be pushed into the lead frame box 2 even if the conveyor belt 62 can no longer convey. In addition, the arrangement of the two conveyor belts 62 ensures that the pushing component 63 can work normally.

[0067] like Figure 4 , Figure 5 As shown, in one embodiment, the pushing assembly 63 includes a first pushing plate 631, a first driving mechanism 632, and a second driving mechanism 633. Specifically, the first pushing plate 631 may include:

[0068] The first strip pusher plate has multiple strip pusher plates, and the multiple strip pusher plates are arranged vertically and parallel to each other;

[0069] The mounting rod is located on the upper part of the first strip push plate and is used to fix the first strip push plate. By setting multiple first strip push plates, it can be ensured that the lead frame 9 is pushed into the lead frame material box 2.

[0070] Furthermore, the output shaft of the first drive mechanism 632 is connected to the mounting rod, and the first drive mechanism 632 is used to drive the first push plate 631 to move up and down. This ensures that when the lead frame 9 passes normally under the discharge machine 63, the first push plate 631 is positioned at a higher level and will not obstruct the lead frame 9. The second drive mechanism 633 is fixed above the conveyor belt 62, and the second drive mechanism 633 is used to drive the first drive mechanism 632 to move reciprocally horizontally. This allows the second drive mechanism 633 to push the lead frame 9 when one end of the lead frame 9 outside the lead frame box 2 reaches the output end of the conveyor belt 62.

[0071] Furthermore, the discharge machine 63 also includes a lifting rod 635 for lifting the mounting rod. The output shaft of the second drive mechanism 633 is connected to the lifting rod 635, and the first drive mechanism 632 is mounted on the lifting rod 635. More preferably, the upper part of the mounting rod is provided with positioning rods 636 located on both sides of the output shaft of the first drive mechanism 632, and the bottom of the lifting rod 635 is provided with a positioning cylinder 637 that cooperates with the positioning rods 636. In this way, when the first drive mechanism 632 is running, the cooperation of the positioning rods 636 and the positioning cylinder 637 can make the first push plate 631 move more smoothly during the up and down movement, ensuring that the lead frame 9 can be pushed smoothly.

[0072] Specifically, both the first drive mechanism 632 and the second drive mechanism 633 can be cylinders. Cylinders have the advantages of rapid action and fast response. When they are running, the lead frame 9 can be quickly pushed into the lead frame material box 2, and the discharge machine 63 can return to its initial state in time after completing the pushing action, thus ensuring that the lead frames 9 formed by subsequent stamping can be pushed into the lead frame material box 2.

[0073] like Figures 2-5 As shown, in one embodiment, the discharge machine 63 further includes:

[0074] The first probe 66 is fixed above the input end of the conveyor belt 62;

[0075] The second probe 634 is fixed on the first push plate 631, and both the second probe 634 and the first probe 66 are electrically connected to the controller.

[0076] In this embodiment, by adjusting the working parameters of the stamping machine and the feeder 6, the front end of the lead frame 9 (in the direction of the lead frame box 2 during conveying) just reaches the input end of the conveyor belt 62, and the rear end of the lead frame 9 on the conveyor belt 62 is just at the output end of the conveyor belt 62. In this way, the first probe 66 and the second probe 634 can detect the two lead frames 9 at the same time and feed the detection signal back to the controller, so that the controller controls the discharge machine 63 to perform the pushing action, thereby automatically realizing the feeding operation of the lead frame box 2.

[0077] like Figure 2 , Figure 3As shown, in one embodiment, the feeder 6 further includes multiple support plates 64; the support plates 64 are disposed between the two conveyor belts 62 along the length direction of the first frame 61, and the upper surface of the support plates 64 is at the same height as the conveying surface of the conveyor belts 62. By setting support plates 64 at the same height as the conveying surface of the conveyor belts 62 between the two conveyor belts 62, the lead frame 9 can be supported by the support plates 64. When the lead frame 9 is pushed, the problem of the lead frame 9 sagging and deforming, thus affecting product quality, is avoided.

[0078] In addition, the support plate 64 can connect with the support groove inside the lead frame box 2, so that the lead frame 9 can be smoothly pushed into or pushed out of the lead frame box 2.

[0079] like Figure 2 , Figure 3 As shown, preferably, the end of the support plate 64 can extend outward from the input end of the conveyor belt 62, so that the feeder 6 can be connected to other conveyor lines or tracks.

[0080] like Figure 8 , Figure 10 As shown, in one embodiment, the material box bracket 3 is U-shaped, and racks are vertically fixed on the outer walls on both sides of the material box bracket 3; the lifting assembly 5 includes a second frame 51, two third drive mechanisms 52, and two gears 54.

[0081] The second frame 51 is fixed on the workbench 1; the third drive mechanism 52 can be a motor, and the motor is fixed on the second frame 51; the gear 54 is connected to the output shaft of the motor and meshes with the rack 7. When the two motors work synchronously, the gear 54 drives the meshing rack 7 to move up or down, thereby realizing the lifting and lowering operation of the material box bracket 3 and the lead frame material box 2.

[0082] In addition, by using gear 54 and rack 7 as a transmission mechanism, the height of the lead frame box 2 can be precisely controlled each time it rises or falls, thereby ensuring that the lead frames 9 are pushed into the lead frame box 2 one by one, and at the same time, it can also ensure that the lead frames 9 in the lead frame box 2 are pushed out one by one.

[0083] like Figures 8-10 As shown, in one embodiment, multiple limiting rods 8 are vertically arranged on the outer walls of both sides of the material box bracket 3; the second frame 51 includes two sets of guide rods; the two sets of guide rods are respectively located on both sides of the material box bracket 3, and each guide rod is provided with a limiting groove 511 that cooperates with the limiting rod. In this embodiment, the lifting and lowering of the material box bracket 3 is limited and guided by the guide rods, making the material box bracket 3 more stable during the lifting and lowering process, and ensuring that the device can realize the feeding and discharging operation.

[0084] like Figure 8 , Figure 9 As shown, in one embodiment, the lifting assembly 5 further includes two third probes 53 and an alarm. The two third probes 53 can be connected to the upper and lower parts of one of the guide rods respectively, and the third probes 53 are electrically connected to the controller; the alarm is also electrically connected to the controller. In this embodiment, the third probes 53 are used to detect the material box bracket 3. When the material box bracket 3 descends from above the workbench 1 onto the workbench 1, or rises to the position where the lead wire frame material box 2 is filled with lead wire frames 9, the third probes 53 can detect the material box bracket 3 and feed the detection signal back to the controller, thereby reminding the operator to replace the lead wire frame material box 2 in time through an alarm sound emitted by the alarm.

[0085] like Figures 11-14 As shown, in one embodiment, the feeding machine 4 includes a linear module 41, a connecting rod 42, and a second push plate 43. The linear module 41 is fixed above the worktable 1; the connecting rod 42 is located above the linear module 41 along its length and is connected to a slide table 411 on the linear module 41; the second push plate 43 is located at the end of the connecting rod 42. By providing a longer connecting rod 42, when the linear module 41 is working, the second push plate 43 can enter the lead frame material box 2, thereby pushing the lead frame 9 in the lead frame material box 2 onto the feeding machine 6, and then the feeding machine 6 transports the lead frame 9 to semiconductor device bonding, wire bonding, and other equipment.

[0086] Specifically, the second pusher plate 43 may include multiple vertical and parallel second strip-shaped pushers to ensure that the lead frame 9 is smoothly pushed out of the lead frame box 2.

[0087] like Figures 11-14 As shown, in one embodiment, the discharge machine 4 further includes a fourth probe 44 and a fifth probe 45; the fourth probe 44 and the fifth probe 45 are respectively disposed on the linear module 41, and the fourth probe 44 and the fifth probe 45 are electrically connected to the controller and are used to detect the slide table 411 on the linear module 41. In this embodiment, by setting two probes to detect the slide table 411, when the fourth probe 44 and the fifth probe 45 detect the slide table 411, the controller can issue different commands to the motor on the linear module 41, thereby limiting the moving distance of the slide table 411 and ensuring that the lead frame 9 can be pushed onto the feeder 6.

[0088] In summary, the present invention provides an automatic feeding and discharging device for a lead frame material box. By setting up a feeding machine, after the lead frame is stamped and formed by the stamping machine, the lead frame can be fed one by one into the liftable lead frame material box through the feeding machine. Therefore, it is not necessary to manually put the lead frame into the lead frame material box, and the feeding operation of the lead frame material box can be automatically realized, thereby improving the operating efficiency and reducing the labor intensity of the operators.

[0089] Furthermore, by positioning the feeder and discharge machine on opposite sides of the lead frame holder, the present invention allows the lead frame to enter the feeder when it is pushed out of the lead frame box. This enables the lead frame to be transported to semiconductor device bonding and wire bonding equipment via the feeder. As a result, the automatic feeding and discharging device for the lead frame box provided by the present invention not only improves production efficiency but also offers multiple functions and greater flexibility. It can be installed at the lead frame stamping machine and at the semiconductor device bonding and wire bonding equipment.

[0090] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solution and inventive concept of the present invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. An automatic feeding and discharging device for lead frame material boxes, comprising a workbench, a controller, a box carrier, a discharging machine, and a lifting assembly connected with the box carrier. The lifting assembly is used to move the material box bracket up and down above the worktable; its characteristic is that... Also includes: The feeder is located on the workbench, and the feeder and the discharger are respectively located on both sides of the material box bracket, and are used to transport the lead frame one by one to the lead frame material box. The feeder includes: The first frame is mounted on the workbench. A conveyor belt, wherein two conveyor belts are mounted on the first frame and are arranged in parallel. A pushing assembly is disposed between two conveyor belts and above the output end of the conveyor belts, and the pushing assembly is used to push the lead frame into the lead frame material box. The feeding assembly includes a first pusher plate, and further includes: A first driving mechanism, the output shaft of which is connected to a first push plate for transmission, and the first driving mechanism is used to drive the first push plate to move up and down. The second drive mechanism is used to drive the first drive mechanism to perform reciprocating horizontal movement. A support plate is provided between two conveyor belts along the length of the first frame, and the upper surface of the support plate is at the same height as the conveying surface of the conveyor belt. The first push plate includes multiple vertically arranged and parallel first strip push plates, an mounting rod disposed on the upper part of the first strip push plate for fixing the first strip push plate, and a lifting rod for suspending the mounting rod; the first drive mechanism is disposed on the lifting rod, and the output shaft of the first drive mechanism is drivenly connected to the first strip push plate; the second drive mechanism is fixed above the conveyor belt, and the output shaft of the second drive mechanism is drivenly connected to the lifting rod. The material box bracket is U-shaped, and racks are vertically fixed on the outer walls of both sides of the material box bracket; the lifting assembly includes: The second frame is fixed on the workbench. The third drive mechanism is fixed on the second frame. The gear is connected to the output shaft of the third drive mechanism and meshes with a rack. Two third probes are respectively located at the upper and lower parts of the guide rod, and the third probes are electrically connected to the controller. An alarm, which is electrically connected to a controller; Multiple limiting rods are vertically provided on the outer walls of both sides of the material box bracket; the second frame includes: Two sets of guide rods are located on both sides of the material box bracket, and each guide rod is provided with a limiting groove that cooperates with the limiting rod; The discharge machine includes: A linear module, which is fixed above the worktable. A connecting rod, which is parallel to the linear module and connected to a slide on the linear module. The second push plate is located at the end of the connecting rod. The fourth and fifth probes are respectively installed on the linear module and are used to detect the slide on the linear module.

2. The automatic lead frame magazine in-out device according to claim 1, wherein The feeding assembly also includes: The first probe is fixed above the input ends of the two conveyor belts; The second probe is fixed on the first push plate.

Images