Lead frame strip conveying device and lead frame strip conveying method

Abstract

This invention provides a lead frame stacking and conveying device and method. The device includes a support mounting plate, a rotating device, a rotating drive device, a transition device, a gripper device, and a holding device. During the stacking process, the gripper device clamps and limits the front end of the lead frame, while the holding device controls the gripper device to move the lead frame, achieving stable conveying of the lead frame. This invention improves the lead frame feeding process and solves the problems of vibration and poor stability during lead frame feeding.

Description

Technical Field

[0001] This invention relates to the field of lead frame manufacturing technology, and in particular to a lead frame stacking and conveying device and method. Background Technology

[0002] Leadframes are an essential raw material for manufacturing semiconductor components. Semiconductor components are manufactured by encapsulating them in resin onto the surface of the leadframe. During the production process, the leadframes need to go through processes such as wafer arrangement, transportation, handling, preheating, and packaging. In the wafer arrangement process, the leadframes need to be transported to a predetermined position so that a handling robot can move them to the designated position to complete the subsequent production processes.

[0003] Traditional chip stacking and transfer structures use an external pusher mechanism to push the lead frames from the cassette to one side of the transition platform. Traditional rollers and belts, under friction, transport the lead frames to the rotary table. Two lead frame strips move sequentially to achieve lead frame transport. However, traditional transport structures lack limiting mechanisms during lead frame transport, making them prone to shaking and collisions, which can deform the internal structure of the chip and affect product quality. Furthermore, traditional transport structures result in an arc-shaped edge to the rotating structure in the middle, leading to poorer edge stability within the same space, and also limiting the size of the lead frame strips being transported. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a lead frame stacking and conveying device and method. This invention improves the lead frame feeding process and solves the problems of easy shaking and poor stability during lead frame feeding.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A lead frame stacking and conveying device, comprising:

[0007] Mounting plate: Used to mount the film conveyor device;

[0008] Rotating device: used to support the lead frame; the rotating device includes a rotating mounting plate, and two sets of support platforms are fixedly connected to the upper end of the rotating mounting plate. The two sets of support platforms are rectangular and arranged side by side.

[0009] Rotary drive unit: mounted above the support plate, used to control the rotation of the rotating device around the Z-axis;

[0010] Transition device: installed above the bearing mounting plate and located on one side of the rotating device and corresponding to the position of the rotating device, the transition device includes a transition support plate, wherein the transition support plate can move linearly along the Z-axis direction;

[0011] Gripper device: Installed above the rotating device, including an upper gripper and a lower gripper. The upper gripper has two gripping ends on both sides at its end, and the lower gripper has two gripping ends on both sides at its end. The lead frame is gripped from both sides by the two gripping ends and the two gripping ends.

[0012] A holding device includes a holding base that can move linearly along the X-axis, the holding base being connected to a gripper device for holding the lead frame in motion.

[0013] Preferably, the gripper device further includes a gripper base, and an electronic control device is installed at the end of the gripper base, wherein the electronic control device controls the upper gripper to move linearly to move closer to or further away from the lower gripper.

[0014] Preferably, the holding device includes a holding mounting base, the holding base is located on one side of the holding device and is slidably connected thereto, the inner wall of the holding device is rotatably connected to a holding screw that passes through the holding base, and the side wall of the holding mounting base is equipped with an electronic control device for controlling the rotation of the holding screw.

[0015] Preferably, an electronic control device three is installed on the side wall of the holding base, which controls the upper and lower grippers to move synchronously and linearly to approach or move away from the rotating device.

[0016] Preferably, the support platform includes an outer support frame and an inner support frame. The inner support frame is fixed at the middle position above the outer support frame and has a pulling channel on both sides. Limiting protrusions are fixedly connected to the upper two sides of the outer support frame, and support limiting strips are fixedly connected to the upper two sides of the inner support frame.

[0017] Preferably, both outer walls of the outer support frame are provided with limit baffles, which are linearly movable relative to the outer support frame, and the upper end of the rotating mounting plate is provided with a control component for controlling the linear movement of the limit baffles.

[0018] Preferably, the control component includes an irregular control shaft, and rollers are installed on the inner sidewalls of both limiting baffles, with the rollers mounted on the movement path of the irregular control shaft.

[0019] A method for transmitting leadframe chips includes the following steps:

[0020] S1. Material preparation: The clamping device is controlled by the pulling device to move the clamping device towards the transition device, and the upper and lower clamping jaws are used to clamp and limit the two sides of the front end of the lead frame.

[0021] S2, One-time pulling: After the lead frame is clamped and limited in S1, the pulling device controls the gripper to move away from the transition device, and controls the lead frame to move to a predetermined position above the first support platform.

[0022] S3, Rotation and Reversal: After one pulling action is completed, control the transition device to descend. After the transition device descends to the predetermined position, control the rotation device to rotate 180° through the rotation drive device. After the rotation device rotates 180°, control the transition device to rise to the predetermined position.

[0023] S4. Secondary pulling action: After the transition device rises to the predetermined position, repeat the pulling action once to control the lead frame to move to the predetermined position above the second support platform.

[0024] Preferably, before the first and second pulling, the two limiting baffles are controlled to move outward by the control device; after the first and second pulling, the two limiting baffles are controlled to move inward by the control device.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. By setting up a rectangular rotating device, and setting up a liftable transition device, a gripper device, and a pulling device on one side of the rotating device, the feeding and pulling process of the lead frame can be optimized. Compared with traditional ball bearing and round belt transmission, it can clamp and limit the front two sides of the lead frame through the gripper device, which can improve the stability of the pulling and limiting, and reduce the shaking and collision of the lead frame movement. Furthermore, by setting up a rectangular support platform, it can support larger-sized lead frame strips within a relatively small area, meeting the processing requirements.

[0027] 2. Compared with traditional roller and round belt conveying methods, this method uses a gripper device to clamp and limit the front sides of the lead frame. Combined with a pulling device, this achieves the pulling and feeding process of the lead frame. Compared with traditional feeding methods, this method occupies less internal space and can stably pull and transport the lead frame, improving conveying stability. Compared with the traditional method of pulling and clamping the lead frame at a single point in the middle, this method can clamp and limit the front sides of the lead frame, resulting in better clamping stability, preventing the tail of the lead frame from swaying, and improving the quality of the finished product.

[0028] 3. By setting an outer support frame and an inner support frame at the top of the support platform, the lead frame can be effectively supported and limited. The inner support frame can support the lead frame from the inside, preventing bending and deformation in the middle of the large lead frame, thus improving the stability and accuracy of lead frame transportation. The tension channel formed between the two supports allows the gripper device to pass through, ensuring the normal operation of the entire device. By controlling the limiting baffle to different positions at different stages of lead frame transportation, the limiting baffle can prevent the lead frame from shaking and colliding and accurately and stably limit its movement at different stages, thereby improving the lead frame feeding rate and the quality of the final product. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0030] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0031] Figure 3 This is a top view of the structure of the present invention;

[0032] Figure 4 This is a side view of the structure of the present invention;

[0033] Figure 5 This is a three-dimensional structural diagram of the holding device and gripper device of the present invention;

[0034] Figure 6 This is a three-dimensional schematic diagram of the rotating device of the present invention;

[0035] Figure 7 This is a schematic diagram of the three-dimensional structure of the upper and lower grippers of the present invention.

[0036] In the diagram: 100, bearing mounting plate; 200, transition device; 210, telescopic device; 220, telescopic end; 230, transition support plate; 300, gripper device; 310, upper gripper; 311, gripping end one; 320, lower gripper; 321, gripping end two; 330, gripper base; 340, electrical control device one; 400, holding device; 410, holding mounting base; 420, holding screw; 430, electrical control device two; 440, holding base; 450, electrical control device three; 500, rotating device; 510, rotating mounting plate; 520, support platform; 521, outer support frame; 522, inner support frame; 523, holding channel; 530, limit baffle; 540, control component; 550, guide rod; 600, preheating table; 700, rotating drive device. Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] Reference Figures 1-7 A lead frame stacking and conveying device includes: a support mounting plate 100, a rotating device 500, a rotating drive device 700, a transition device 200, a gripper device 300, and a holding device 400; wherein the support mounting plate 100 is used to install the stacking and conveying device; the rotating device 500 is used to support the lead frame, realize the loading and storage of the lead frame, and subsequently the lead frame is transported to one side of the preheating table 600 by a handling robot. By transporting the lead frame to the surface of the rotating device 500, the loading and positioning of the lead frame can be realized, ensuring the stability of subsequent handling and processing.

[0039] The rotating device 500 includes a rotating mounting plate 510, on which two sets of support platforms 520 are fixedly connected. Both sets of support platforms 520 are rectangular and arranged side by side. By setting two parallel support platforms 520, two lead frame frames can be supported and limited simultaneously, which improves the feeding rate of lead frame frames. By setting the support platform 520 to be rectangular, compared with the traditional support platform 520 with arc-shaped edges, it occupies less space and can carry larger lead frame strips in the same space, meeting the needs of production and processing.

[0040] The rotary drive device 700 is mounted above the support mounting plate 100 and is used to control the rotation of the rotary device 500 about the Z-axis; see attached figure. Figure 2 Here, the Z-axis is defined as the vertical direction and the X-axis as the left and right direction, which is the direction of movement of the lead frame. The rotating device 500 can rotate along the Z-axis and can realize the front and rear feeding process of the two lead frames while keeping the feeding port position unchanged. The aforementioned rotating drive device 700 can be selected from rotating equipment such as an electrically controlled rotary table or a rotary cylinder, which can control the rotation of the rotating device 500.

[0041] The transition device 200 is installed above the support mounting plate 100 and located on one side of the rotating device 500, corresponding to the position of the rotating device 500. It is located between the outer material box and the rotating device 500. The pushing structure on the outside of the material box pushes the lead frame strip inside the material box to the top of the transition device 200, realizing the feeding preparation of the lead frame strip. The transition device 200 includes a transition support plate 230, wherein the transition support plate 230 can move linearly along the Z-axis direction. The transition device 200 also includes a telescopic device 210, which has a telescopic end 220. The telescopic end 220 is connected to the transition support plate 230. Due to the support platform of the rotating device 500 520 is rectangular. During the rotation of the rotating device 500, the telescopic device 210 controls the transition support plate 230 to retract and descend, so that it is staggered from the rotation path of the rotating device 500, ensuring that the overall equipment can operate normally. After the rotating device 500 and the transition device 200 are aligned, the gap between them is small and the position is accurately matched, which can ensure that the lead frame strip can be fed stably and accurately. It should be noted that the transition support plate 230 has two working positions. When it is in the top working position, the transition support plate 230 is flush with the support platform 520 and corresponds to each other, forming a feeding channel between them, allowing the lead frame to move smoothly.

[0042] The gripper device 300 is mounted above the rotating device 500 and is used to grip the lead frame strip and pull the strip to a predetermined position. It includes an upper gripper 310 and a lower gripper 320. The upper gripper 310 has two gripping ends 311 located on both sides, with a predetermined distance between them. The lower gripper 320 has two gripping ends 321 located on both sides, with a predetermined distance between them. The predetermined distance is related to the size and layout of the lead frame. During gripping, the gripping ends contact the connecting ribs of the lead frame, achieving effective gripping of the lead frame and preventing damage during gripping. The process avoids damaging the surface semiconductor components. Clamping the lead frame from both sides using two clamping ends 311 and 321 ensures stable and accurate clamping. This side-clamping limit, compared to traditional single-point clamping from the middle, limits the clamping area and prevents tail-end wobbling during movement, leading to damage. Clamping from both sides limits the lead frame's position, making it more stable during pulling and preventing tail-end collisions, thus improving the quality of the finished product.

[0043] The holding device 400 includes a holding base 440 that can move linearly along the X-axis. The holding base 440 is connected to the gripper device 300 for holding the lead frame to move. The holding device 400 can drive the position of the gripper device 300, thereby holding the lead frame strip and allowing the strip to be held from the transition device 200 side to a predetermined position to complete the feeding process.

[0044] Please refer to the appendix for details. Figure 4 and appendix Figure 7 The gripper device 300 also includes a gripper base 330, and an electronic control device 340 is installed at the end of the gripper base 330. The electronic control device 340 controls the upper gripper 310 to move linearly to approach or move away from the lower gripper 320. When the upper gripper 310 and the lower gripper 320 approach each other, they can clamp and limit the lead frame through the clamping end 311 and clamping end 321 at their ends, thereby clamping and limiting the lead frame from both the upper and lower sides. After the clamping is completed, the two separate from each other, and the gripper device 300 is controlled to continue to move a predetermined distance towards the front end to achieve the separation of the two.

[0045] Please refer to the appendix for details. Figure 5 The holding device 400 includes a holding mounting base 410, a holding base 440 located on one side of the holding device 400 and slidably connected thereto, a holding screw 420 rotatably connected to the inner wall of the holding device 400 and passing through the holding base 440, and an electrical control device 430 for controlling the rotation of the holding screw 420 installed on the side wall of the holding mounting base 410. The electrical control device 430 controls the rotation of the holding screw 420, and the holding screw 420 controls the linear movement of the holding base 440 during the forward and reverse rotation process to realize the driving process, so that the gripper device 300 on one side of the holding base 440 moves along the X-axis direction to realize the clamping and holding of the strip and realize the feeding of the strip.

[0046] An electrical control device 3450 is installed on the side wall of the holding base 440. The electrical control device 3450 controls the upper gripper 310 and the lower gripper 320 to move synchronously and linearly to approach or move away from the rotating device 500. By setting the electrical control device 3450, it can be controlled to be in different vertical positions on the Z-axis, so that the gripper device 300 can be staggered from the rotation path of the rotating device 500 and consistent with the movement purpose of the transition device 200. In order to ensure that the rectangular rotating device 500 can rotate normally, the overall equipment can work normally.

[0047] The support platform 520 includes an outer support frame 521 and an inner support frame 522. The inner support frame 522 is fixed above the middle position of the outer support frame 521, and has tensioning channels 523 on both sides. Limiting protrusions are fixedly connected to the upper two sides of the outer support frame 521, and supporting limiting strips are fixedly connected to the upper two sides of the inner support frame 522. The cross-section of the limiting protrusions and the outer support frame 521 is U-shaped, and the cross-section of the supporting limiting strips and the inner support frame 522 is also U-shaped. The height of the supporting limiting strips is lower than the height of the limiting protrusions. Compared with traditional roller and belt conveyor structures, the supporting limiting strips can support the bottom of the middle position of the lead frame, ensuring the stability of the lead frame, especially large-sized lead frames, during movement, preventing the middle part from deforming, and ensuring the stability and accuracy of the lead frame strip support limiting.

[0048] Limiting baffles 530 are provided on both outer walls of the outer support frame 521. The limiting baffles 530 can move linearly relative to the outer support frame 521. A control component 540 is provided on the upper end of the rotating mounting plate 510 to control the linear movement of the limiting baffles 530. During the movement of the lead frame, the control component 540 controls the limiting baffles 530 on both sides to move outward and open. At this time, the gap of the lead frame movement is larger, which can prevent the edge of the lead frame from rubbing and bumping against the limiting baffles 530, and avoid damage to the surface of the lead frame. When the lead frame moves to the predetermined position, the control component 540 controls the two limiting baffles 530 to retract. At this time, the two limiting baffles 530 can clamp and limit the lead frame from the outside. Their interior abuts against the outer wall of the lead frame, which can ensure the accuracy and stability of the lead frame limit and also prevent the lead frame from shaking during the rotation of the rotating device 500, ensuring the accuracy and stability of the final product position.

[0049] A guide rod 550 is installed on the upper end of the rotating mounting plate 510. The guide rod 550 passes through the limiting baffles 530 on both sides and can limit and guide them, ensuring the stability of the movement of the limiting baffles 530 on both sides, and making the clamping of the middle lead frame strip more stable and accurate.

[0050] As a preferred control method, the control component 540 includes an irregular control shaft, and rollers are installed on the inner walls of both limit baffles 530. The rollers are installed on the movement path of the irregular control shaft. During the movement of the control component 540, the limit baffles 530 on both sides can be moved outward by spreading the rollers. The limit baffles 530 can return to the predetermined position under the action of the return spring to achieve automatic reset. The irregular control shaft can be composed of two shaft segments with different shaft diameters. The two different shaft segments are connected by a continuous smooth transition surface. When the different shaft segments move to one side of the rollers, the rollers and limit baffles 530 can be placed in different positions. When the rollers come into contact with the shaft segment with the larger bearing, the limit baffles 530 are spread open to realize the opening process.

[0051] A method for transmitting leadframe chips includes the following steps:

[0052] S1. Material preparation: The clamping device is controlled by the pulling device to move the clamping device towards the transition device. The upper and lower clamping jaws clamp and limit the front sides of the lead frame. At this time, the clamping ends one and two on both sides of the upper and lower clamping jaws clamp and limit the front sides of the lead frame. Compared with the traditional single-point clamping in the middle, clamping from both sides is more stable, which can avoid the shaking of the tail of the lead frame, avoid the collision of the lead frame strip, and improve the quality of the finished product.

[0053] S2, One-time clamping: After the lead frame is clamped and limited in S1, the clamping device controls the gripper to move away from the transition device, and controls the lead frame to move to a predetermined position above the first support platform; the lead frame moves synchronously with the gripper, and the lead frame moves from the side of the transition device to the predetermined support platform above the rotating device, realizing one-time feeding.

[0054] S3. Rotation and Reversal: After one pulling action is completed, the transition device is controlled to descend. After the transition device descends to the predetermined position, the rotating device is controlled to rotate 180° through the rotation drive device. After the rotating device rotates 180°, the transition device is controlled to rise to the predetermined position. During the rotation, both the transition device and the gripper device are controlled to move along the Z-axis to the predetermined position below, which is offset from the rotation path of the rotating device, ensuring the normal and stable operation of the overall structure. Furthermore, by setting both to be able to move along the Z-axis, the support platform at the upper end of the rotating device can be designed to be rectangular, which can support larger strips within the same area to meet processing requirements.

[0055] S4. Secondary pulling: After the transition device rises to the predetermined position, the pulling action is repeated once to control the lead frame to move to the predetermined position above the second support platform. At this time, the feeding of two lead frame strips is completed. Subsequently, the two lead frame strips are transported to the side of the preheating table for preheating by the handling robot to realize the feeding process of the lead frame strips.

[0056] It should be noted that: before the first and second pulling, the two limiting baffles are moved outward by the control device; after the first and second pulling, the two limiting baffles are moved inward by the control device. Controlling the outward movement of the two limiting baffles during the pulling of the lead frame expands the movement path of the lead frame, preventing the edges of the lead frame from colliding with the inner walls of the limiting baffles during movement, thus improving product quality and reducing the scrap rate. Furthermore, after the lead frame moves to the predetermined position, the limiting baffles can be moved inward by controlling the two limiting baffles on both sides to achieve limiting and clamping of the lead frame in the middle position, ensuring the accurate and stable positioning of the lead frame, improving the stability of the lead frame during equipment rotation, and guaranteeing the quality of the finished product.

[0057] Finally, it's important to note that the lead frame is supported by a combination of outer and inner support frames. The inner support frame provides support and restraint at the center of the lead frame, ensuring stability during movement. This is especially beneficial for large lead frames, providing central support to prevent thinner frames from bending and deforming under their own weight. Similarly, a tensioning channel is formed between the outer support frame and the tensioning channel. The tensioning channels on both sides correspond to the clamping ends one and two, providing clamping, restraint, and tensioning of the lead frame strips from both sides. Compared to traditional single-point tensioning in the center, this method offers more reliable and stable restraint, reducing overall shaking and collisions during lead frame movement, and significantly improving product quality.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lead frame assembly and transmission device, characterized in that, include: Mounting plate (100): used for mounting the film conveying device; Rotating device (500): used to support the lead frame; the rotating device (500) includes a rotating mounting plate (510), and two sets of support platforms (520) are fixedly connected to the upper end of the rotating mounting plate (510). Both sets of support platforms (520) are rectangular and arranged side by side. Rotary drive device (700): mounted above the support mounting plate (100), used to control the rotation device (500) to rotate about the Z-axis; Transition device (200): installed above the bearing mounting plate (100) and located on one side of the rotating device (500) and corresponding to the position of the rotating device (500), the transition device (200) includes a transition support plate (230), wherein the transition support plate (230) can move linearly along the Z-axis direction; Gripper device (300): Installed above the rotating device (500), including an upper gripper (310) and a lower gripper (320). The upper gripper (310) has two gripping ends (311) located on both sides at its end, and the lower gripper (320) has two gripping ends (321) located on both sides at its end. The lead frame is gripped from both sides by the two gripping ends (311) and the two gripping ends (321). The holding device (400) includes a holding base (440) that can move linearly along the X-axis direction, the holding base (440) being connected to a gripper device (300) for holding the lead frame to move.

2. The lead frame assembly and transmission device according to claim 1, characterized in that, The gripper device (300) further includes a gripper base (330), and an electrical control device (340) is installed at the end of the gripper base (330). The electrical control device (340) controls the upper gripper (310) to move linearly to move closer to or further away from the lower gripper (320).

3. The lead frame assembly and transmission device according to claim 1, characterized in that, The holding device (400) includes a holding mounting base (410), the holding base (440) is located on one side of the holding device (400) and is slidably connected thereto, the inner wall of the holding device (400) is rotatably connected to a holding screw (420) that passes through the holding base (440), and the side wall of the holding mounting base (410) is equipped with an electronic control device (430) for controlling the rotation of the holding screw (420).

4. The lead frame assembly and transmission device according to claim 3, characterized in that, The side wall of the holding base (440) is equipped with an electric control device three (450), which controls the upper jaw (310) and the lower jaw (320) to move synchronously and linearly to approach or move away from the rotating device (500).

5. The lead frame assembly and transmission device according to claim 1, characterized in that, The support platform (520) includes an outer support frame (521) and an inner support frame (522). The inner support frame (522) is fixed at the middle position above the outer support frame (521) and has a pulling channel (523) on both sides. Limiting protrusions are fixedly connected to the upper two sides of the outer support frame (521), and support limiting strips are fixedly connected to the upper two sides of the inner support frame (522).

6. The lead frame assembly and transmission device according to claim 5, characterized in that, Both sides of the outer wall of the outer support frame (521) are provided with limit baffles (530). The limit baffles (530) can move linearly relative to the outer support frame (521). The upper end of the rotating mounting plate (510) is provided with a control component (540) for controlling the linear movement of the limit baffles (530).

7. The lead frame assembly and transmission device according to claim 6, characterized in that, The control component (540) includes an irregular control shaft, and rollers are installed on the inner sidewalls of the two limit baffles (530), which are mounted on the movement path of the irregular control shaft.

8. A method for transmitting leadframes using the leadframe transmission device according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Material preparation: The clamping device is controlled by the pulling device to move the clamping device towards the transition device, and the upper and lower clamping jaws are used to clamp and limit the two sides of the front end of the lead frame. S2, One-time pulling: After the lead frame is clamped and limited in S1, the pulling device controls the gripper to move away from the transition device, and controls the lead frame to move to a predetermined position above the first support platform. S3, Rotation and Reversal: After one pulling action is completed, control the transition device to descend. After the transition device descends to the predetermined position, control the rotation device to rotate 180° through the rotation drive device. After the rotation device rotates 180°, control the transition device to rise to the predetermined position. S4. Secondary pulling action: After the transition device rises to the predetermined position, repeat the pulling action once to control the lead frame to move to the predetermined position above the second support platform.

9. A lead frame arrangement and transmission method according to claim 8, characterized in that, Before the first and second pulls, the two limit baffles are controlled to move outward by the control device; after the first and second pulls, the two limit baffles are controlled to move inward by the control device.

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