A type of alignment and stacking equipment for lead frame processing

Abstract

This invention relates to the field of lead frame stacking equipment technology, and more particularly to a straightening and stacking equipment for lead frame processing. The equipment includes a frame, a conveying mechanism rotatably connected to a rotating frame, a storage box fixedly connected to the frame, a first push rod and a telescopic rod fixedly connected to the rotating frame, a mounting frame fixedly connected to the telescopic end of the telescopic rod, a rotating shaft rotatably connected to the mounting frame, a rotating plate fixedly connected to the rotating shaft, and circumferentially evenly spaced connecting members slidably connected to the rotating plate. Each connecting member is detachably fitted with a suction cup. This invention, by using circumferentially evenly spaced suction cups, allows for the replacement of damaged suction cups when they fail to properly hold the lead frames. This enables the equipment to replace damaged suction cups without stopping the machine, allowing continued lead frame stacking, reducing the impact of equipment failure on the entire production line and ensuring production efficiency.

Description

Technical Field

[0001] This invention relates to the field of lead frame stacking equipment technology, and more particularly to a straightening and stacking equipment for lead frame processing. Background Technology

[0002] Leadframe stacking equipment is one of the most critical automated pieces of equipment in semiconductor back-end packaging (especially leadframe-type packages such as DIP, SOP, QFP, QFN / DFN, etc.) production lines. It is responsible for accurately, efficiently, and without damage stacking the processed leadframe units (usually from stamping or etching equipment) into stacks of a specified height to facilitate subsequent storage, transportation, and encapsulation processes.

[0003] Existing stacking equipment mostly uses suction cups to pick up the lead frames from the conveyor mechanism, then transfers the lead frames to the storage box for release, completing the stacking of the lead frames. As the suction cups are used for a long time, they will be damaged due to material aging and other reasons, so they need to be replaced regularly. However, it cannot be guaranteed that each suction cup will not fail after the specified service life. Some suction cups will still fail to work properly before replacement, which requires stopping the equipment to replace them. This delays the stacking of lead frames and may even cause the entire production line to stop, seriously affecting production efficiency. Summary of the Invention

[0004] In order to overcome the shortcomings mentioned in the background art, the present invention provides a straightening and stacking device for lead frame processing.

[0005] The technical solution is as follows: A straightening and stacking device for processing lead frame includes a frame, the frame being provided with a conveying mechanism and rotatably connected to a rotating frame, a storage box, a first motor and a vacuum pump being fixedly connected to the frame, the output shaft of the first motor being driven by a gear set to the rotating frame, the rotating frame being fixedly connected to a first push rod and a telescopic rod, the telescopic end of the telescopic rod being fixedly connected to a mounting frame, the telescopic end of the first push rod being fixedly connected to the mounting frame, the mounting frame being fixedly connected to a connector and a second motor, the air inlet of the vacuum pump being connected to the connector through a pipe, the mounting frame being rotatably connected to a rotating shaft, the output shaft of the second motor being driven by a gear set to the rotating shaft, the rotating shaft being fixedly connected to a rotating plate, the rotating plate being slidably connected to circumferentially evenly spaced connecting parts, the connector communicating with adjacent connecting parts, and the connecting parts being detachably mounted with suction cups.

[0006] Preferably, the connector is equipped with a tension sensor, the connector is slidably connected to a sliding plate, and a tension spring is provided between the sliding plate and the tension sensor.

[0007] Preferably, the connector is slidably connected to a limiting post, a spring is provided between the limiting post and the connector, the suction cup is provided with a limiting groove, and the limiting post is used to insert into the limiting groove to limit the suction cup.

[0008] Preferably, the mounting bracket is fixedly connected to a positioning slide rail, the connector is fixedly connected to a fixing seat, and the fixing seat is rotatably connected to two rollers, which are symmetrically distributed and located on both sides of the positioning slide rail.

[0009] Preferably, the storage box has two hinged doors on its upper side, a second push rod is fixed to the outside of the storage box, and the doors are hinged to connecting rods. Both connecting rods are hinged to the telescopic ends of the second push rod.

[0010] Preferably, a fan is fixedly connected to the frame, and the air outlet of the fan is connected to the bottom of the storage box through a pipe, which is equipped with a filter.

[0011] Preferably, a placement rack is fixed inside the storage box to support the lead frame.

[0012] Preferably, the connector is provided with a first seal and a second seal, the connector head is pressed against the adjacent first seal, and the second seal is pressed against the adjacent suction cup.

[0013] Preferably, the bottom of the connector is provided with a compression part, and the longitudinal section edge of the compression part is rounded to reduce the damage to the first seal when it is compressed.

[0014] Preferably, the connector is provided with an expansion portion for guiding the connector head.

[0015] The beneficial effects are: 1. By setting up suction cups that are evenly distributed around the circumference, when a suction cup is damaged and cannot properly hold the lead frame, the damaged suction cup can be replaced. This allows the equipment to replace the damaged suction cup without stopping the machine, and continue stacking the lead frame, reducing the impact of equipment failure on the entire production line and ensuring its production efficiency.

[0016] 2. By adjusting the height of the suction cups using positioning slide rails, the suction cups not in use are made higher than those in use, thus preventing the suction cups not in use from interfering with the suction cups in use adhering to the lead frame.

[0017] 3. Ventilate the storage box with a fan to blow air out of the storage box, thereby reducing the probability of dust falling into the storage box and thus reducing the probability of dust falling on the lead frame inside the storage box, thus protecting the lead frame. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the rotating frame and the first motor of the present invention;

[0020] Figure 3 This is a three-dimensional structural diagram of the mounting bracket and connector of the present invention;

[0021] Figure 4 This is an exploded view of the connector and suction cup of the present invention;

[0022] Figure 5 This is a three-dimensional structural diagram of the second push rod and connecting rod of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 1-Frame, 101-Storage box, 2-Transfer mechanism, 3-Rotating frame, 301-First push rod, 4-First motor, 5-Telescopic rod, 6-Mounting frame, 7-Connector, 701-Extrusion section, 8-Vacuum pump, 9-Rotating shaft, 10-Rotating plate, 11-Connector, 1101-Expansion section, 12-Suction cup, 13-Second motor, 14-Tension sensor, 15-Sliding plate, 16-Tension spring, 17-Limiting post, 18-Spring, 19-Limiting groove, 20-Positioning slide rail, 21-Fixed seat, 22-Roller, 23-Box door, 24-Second push rod, 25-Connecting rod, 26-Fan, 27-Placement frame, 28-First seal, 29-Second seal. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0025] Example 1

[0026] The existing equipment cannot automatically replace damaged suction cups during use, requiring the equipment to be stopped before operation, which affects the stacking efficiency of the lead frame.

[0027] A type of alignment and stacking equipment for lead frame fabrication, such as Figures 1-5As shown, the system includes a frame 1, which is equipped with a conveying mechanism 2 and rotatably connected to a rotating frame 3. The conveying mechanism 2 is used to connect to upstream equipment and transport the lead frame to the stacking area. The rotating frame 3 is L-shaped. A storage box 101, a first motor 4, and a vacuum pump 8 are fixedly connected to the frame 1. The storage box 101 is used to stack the lead frame. The output shaft of the first motor 4 is driven by a gear set to the rotating frame 3. A first push rod 301 and a telescopic rod 5 are fixedly connected to the left side of the rotating frame 3. A mounting frame 6 is fixedly connected to the telescopic end of the telescopic rod 5. The telescopic end of the first push rod 301 is fixedly connected to the mounting frame 6. A connector 7 and a second motor 13 are fixedly connected to the mounting frame 6. The connector 7 passes through the mounting frame 6. The air inlet of the vacuum pump 8 is connected to... The connectors 7 are connected by pipes. The connectors 7 are made of rigid material. The mounting bracket 6 is rotatably connected to a rotating shaft 9, which is located between the connectors 7 and the second motor 13. The output shaft of the second motor 13 is driven by a gear set to the upper part of the rotating shaft 9. A rotating plate 10 is fixedly connected to the lower part of the rotating shaft 9. Two connecting pieces 11 are slidably connected to the rotating plate 10, which are evenly spaced in the circumferential direction. The number of connecting pieces 11 can be adjusted as needed. Two are shown in the figure as an example. The connectors 7 are connected to the adjacent connecting pieces 11. A suction cup 12 is detachably installed on the lower side of the connecting piece 11. The suction cup 12 consists of an upper mounting part and a lower suction part. The mounting part of the suction cup 12 is made of rigid material. A pressing part 701 is provided at the bottom of the connector 7. The longitudinal section edge of the pressing part 701 is rounded to reduce damage to the first seal 28 when it is compressed. The connector 11 is provided with an expansion portion 1101, which is used to guide the connector 7, thereby increasing the fault tolerance when connecting the connector 11 and the connector 7, so that the connection between the two can be completed even if the lower part of the connector 7 is not completely aligned with the middle part of the connector 11. Multiple sets of the above structure can be set as needed. The figure shows one set as an example.

[0028] like Figure 4 As shown, the connector 7 is equipped with a tension sensor 14, and a sliding plate 15 is slidably connected to the connector 7. A sealing element is provided between the sliding plate 15 and the connector 7 to separate the spaces on both sides of the sliding plate 15. A tension spring 16 is provided between the sliding plate 15 and the tension sensor 14. When the air pressure inside the connector 7 changes, the position of the sliding plate 15 changes accordingly, and the length of the tension spring 16 also changes. The tension of the tension spring 16 on the tension sensor 14 also changes accordingly. Thus, the tension sensor 14 detects the air pressure inside the connector 7 to determine whether the suction cup 12 is properly holding the lead frame.

[0029] like Figure 4As shown, the connector 11 is slidably connected to the limiting post 17, which consists of a cylinder and a hemisphere. A spring 18 is provided between the limiting post 17 and the connector 11. The suction cup 12 is provided with a limiting groove 19. The limiting post 17 is used to insert into the limiting groove 19 to limit the suction cup 12. The depth of the limiting groove 19 is less than the radius of the hemisphere of the limiting post 17, thereby realizing the quick connection and disassembly between the suction cup 12 and the connector 11.

[0030] like Figure 3 and Figure 4 As shown, the mounting bracket 6 is fixedly connected to a positioning slide rail 20. The projection of the positioning slide rail 20 on the horizontal plane is circular, but the front part of the positioning slide rail 20 is lower than its rear part, so that when the suction cup 12 in operation picks up the lead frame, the suction cup 12 on the rear side will not contact the lead frame. The connector 11 is fixedly connected to a fixing seat 21. The fixing seat 21 is rotatably connected to two rollers 22. The two rollers 22 are symmetrically distributed vertically and are located on the upper and lower sides of the positioning slide rail 20, so that the two rollers 22 on the same fixing seat 21 are limited by the positioning slide rail 20 to change the height of the fixing seat 21.

[0031] like Figure 4 As shown, the connector 11 is provided with a first seal 28 and a second seal 29. The connector 7 is pressed against the adjacent first seal 28, and the second seal 29 is pressed against the adjacent suction cup 12, thereby improving the sealing between the connector 11 and the connector 7, as well as between the connector 11 and the adjacent suction cup 12.

[0032] When stacking lead frames using this device, the conveying mechanism 2 transports the lead frames to below the suction cup 12. At this time, the first push rod 301 is activated, and the telescopic end of the first push rod 301 drives the mounting bracket 6 to move downward. The mounting bracket 6 drives the connector 7 and the rotating shaft 9 to move downward. The connector 7 and the rotating shaft 9 drive the rotating plate 10 and the connector 11 to move. The connector 11 drives the suction cup 12 to move. When the suction cup 12 in use contacts the lead frame, the first push rod 301 stops working. At the same time, the vacuum pump 8 starts. The vacuum pump 8 extracts the air between the suction cup 12 and the lead frame through the connector 7 and the connector 11, creating a negative pressure between the suction cup 12 and the lead frame, thereby causing the suction cup 12 to hold the lead frame. As the air pressure in the connector 7 gradually decreases, the sliding plate 15 moves and stretches the tension spring 16. The tension sensor 1... 4. The tension of the tension spring 16 gradually increases. When the suction cup 12 holds the lead frame, the sliding plate 15 stops moving. Then, the telescopic end of the first push rod 301 retracts, and the transmission suction cup 12 lifts the lead frame. Then, the first motor 4 starts, and the output shaft of the first motor 4 drives the rotating frame 3 to rotate through the gear set. The rotating frame 3 drives the suction cup 12 to move the lead frame above the storage box 101. Then, the first motor 4 stops working. At the same time, the telescopic end of the first push rod 301 extends, and the transmission lead frame moves downward. Then, the vacuum pump 8 stops working, and the transmission suction cup 12 releases the lead frame, allowing the lead frame to enter the storage box 101. Then, the telescopic end of the first push rod 301 returns to its original position, and the first motor 4 starts again. The output shaft of the first motor 4 drives the suction cup 12 to rotate to its original position, ready to transport the next lead frame.

[0033] When suction cup 12 malfunctions and cannot be used normally, air leakage occurs during the process of vacuum pump 8 driving suction cup 12 to hold the lead frame. At this time, the air pressure in connector 7 cannot be reduced to a value sufficient for suction cup 12 to hold the lead frame. The movement of sliding plate 15 is less than during normal operation, resulting in less deformation of tension spring 16 and correspondingly less tension on tension sensor 14. At this point, second motor 13 starts, and the output shaft of second motor 13 drives rotating shaft 9 through gear set. Rotating shaft 9 drives rotating plate 10 to rotate, rotating plate 10 drives two connecting parts 11 to rotate, and connecting parts 11 drive two suction cups 12 to rotate, thus... The suction cup 12 is replaced to enable emergency replacement of the suction cup 12. After the suction cup 12 is replaced, the work can continue. During the interval when the equipment is stopped, the damaged suction cup 12 is replaced to reduce the impact of the damaged suction cup 12 on the stacking of the lead frame. During the replacement of the two suction cups 12, the connector 11 drives the fixed base 21 to rotate. The fixed base 21 changes the position of the two adjacent rollers 22 through the positioning slide rail 20, thereby lifting the damaged suction cup 12 and lowering the undamaged suction cup 12, thus avoiding the situation where the suction cup 12 not in use affects the suction cup 12 in use and sticks to the lead frame.

[0034] Example 2

[0035] When existing equipment stacks lead frames, dust in the air falls onto the lead frames. Stacking the lead frames on top of these leads causes the dust to be squeezed, resulting in scratches on the lead frames.

[0036] Based on Example 1, such as Figure 1 and Figure 5 As shown, the upper side of the storage box 101 is hinged with two doors 23. When the lead frame is placed into the storage box 101, the doors 23 open. When the lead frame is not stacked, the doors 23 close to prevent dust in the air from falling into the storage box 101. A second push rod 24 is fixed to the rear side of the storage box 101. The doors 23 are hinged with connecting rods 25. Both connecting rods 25 are hinged to the telescopic end of the second push rod 24, thereby controlling the opening and closing of the doors 23 through the second push rod 24.

[0037] like Figure 1 and Figure 5 As shown, a fan 26 is fixedly connected to the frame 1. The air outlet of the fan 26 is connected to the bottom of the storage box 101 through a pipe, so that the fan 26 supplies air into the storage box 101 and then blows the air out of the storage box 101. This reduces the probability of air entering the storage box 101 during the process of placing the lead frame into the storage box 101. A filter is installed in the pipe to filter the airflow blown into the storage box 101 by the fan 26, so as to prevent dust in the air from entering the storage box 101 with the airflow.

[0038] Before the suction cup 12 transfers the lead frame above the storage box 101, the fan 26 is started. The fan 26 blows air into the storage box 101 through the pipe. Then the second push rod 24 is started. The telescopic end of the second push rod 24 extends and drives the two box doors 23 to open through the two connecting rods 25, thereby blowing the airflow out of the storage box 101, reducing the probability of dust in the air drifting into the storage box 101, and reducing the wear between the lead frames caused by dust. When the storage box 101 is full of lead frames, the second push rod 24 is started first. The telescopic end of the second push rod 24 drives the box doors 23 to close, and then the fan 26 is turned off. After that, the lead frames in the storage box 101 can be removed to prepare for the next stacking of lead frames.

[0039] Example 3

[0040] Based on Example 1, such as Figure 5 As shown, a placement rack 27 is fixed inside the storage box 101. The placement rack 27 is used to support the lead frame so that the lead frame does not stick to the bottom of the storage box 101, thus making it easy to remove the lead frame from the storage box 101.

[0041] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A straightening and stacking device for processing lead frame, comprising a frame (1), wherein the frame (1) is provided with a conveying mechanism (2) and rotatably connected to a rotating frame (3), wherein the frame (1) is fixedly connected to a storage box (101), a first motor (4) and a vacuum pump (8), wherein the output shaft of the first motor (4) is driven to the rotating frame (3) by a gear set, wherein the rotating frame (3) is fixedly connected to a first push rod (301) and a telescopic rod (5), wherein the telescopic end of the telescopic rod (5) is fixedly connected to a mounting frame (6), and the telescopic end of the first push rod (301) is fixedly connected to the mounting frame (6), characterized in that, The mounting bracket (6) is fixedly connected to a connector (7) and a second motor (13). The air inlet of the vacuum pump (8) is connected to the connector (7) through a pipe. The mounting bracket (6) is rotatably connected to a rotating shaft (9). The output shaft of the second motor (13) is driven to the rotating shaft (9) through a gear set. The rotating shaft (9) is fixedly connected to a rotating plate (10). The rotating plate (10) is slidably connected to circumferentially spaced connecting pieces (11). The connector (7) is connected to the adjacent connecting piece (11). The connecting piece (11) is detachably equipped with a suction cup (12). The mounting bracket (6) is fixedly connected to a positioning slide rail (20), and the connector (11) is fixedly connected to a fixing seat (21). The fixing seat (21) is rotatably connected to two rollers (22). The two rollers (22) are symmetrically distributed and located on both sides of the positioning slide rail (20). The projection of the positioning slide rail (20) on the horizontal plane is circular, but the front part of the positioning slide rail (20) is lower than its rear part, so that the two rollers (22) on the same fixed seat (21) are limited by the positioning slide rail (20) to change the height of the fixed seat (21).

2. The alignment and stacking equipment for lead frame processing according to claim 1, characterized in that, The connector (7) is provided with a tension sensor (14), and the connector (7) is slidably connected to a sliding plate (15). A tension spring (16) is provided between the sliding plate (15) and the tension sensor (14).

3. The alignment and stacking equipment for lead frame processing according to claim 1, characterized in that, The connector (11) is slidably connected to the limiting post (17), and a spring (18) is provided between the limiting post (17) and the connector (11). The suction cup (12) is provided with a limiting groove (19), and the limiting post (17) is used to insert into the limiting groove (19) to limit the suction cup (12).

4. The alignment and stacking equipment for lead frame processing according to claim 1, characterized in that, The storage box (101) has two doors (23) hinged to its upper side. A second push rod (24) is fixed to the outside of the storage box (101). The doors (23) are hinged to connecting rods (25). Both connecting rods (25) are hinged to the telescopic ends of the second push rod (24).

5. The alignment and stacking equipment for lead frame processing according to claim 4, characterized in that, The frame (1) is fixedly connected to a fan (26), and the air outlet of the fan (26) is connected to the bottom of the storage box (101) through a pipe, which is equipped with a filter.

6. The alignment and stacking equipment for lead frame processing according to claim 1, characterized in that, The storage box (101) is fixedly connected to a placement rack (27), which is used to support the lead frame.

7. The alignment and stacking equipment for lead frame processing according to claim 1, characterized in that, The connector (11) is provided with a first seal (28) and a second seal (29). The connector (7) is pressed against the adjacent first seal (28), and the second seal (29) is pressed against the adjacent suction cup (12).

8. The alignment and stacking equipment for lead frame processing according to claim 7, characterized in that, The bottom of the connector (7) is provided with a compression part (701), and the longitudinal section edge of the compression part (701) is rounded to reduce the damage to the first seal (28) when it is compressed.

9. The alignment and stacking equipment for lead frame processing according to claim 1, characterized in that, The connector (11) is provided with an expansion portion (1101) for guiding the connector (7).

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