Lead frame conveying and stacking tooling

Abstract

A lead frame conveying and stacking tool is provided at the conveying end of a pair of lead frame conveyor belts arranged at intervals, and includes: a material-dispensing mechanism provided at the end of the conveyor belt; a receiving and transferring mechanism provided at the front end of the material-dispensing mechanism in the pushing direction, used to alternately receive and transfer lead frames from two conveyor belts, the material-dispensing mechanism is used to push the lead frames at the end of the conveyor belt to the receiving and transferring mechanism when the receiving and transferring mechanism receives the corresponding conveyor belt; a material-loading and stacking mechanism provided above the receiving and transferring mechanism; a supporting mechanism provided at both ends of the material-loading and stacking mechanism, the supporting mechanism is used to carry the material frame conveyed, and the material-loading and stacking mechanism is used to alternately push the lead frames carried on the receiving and transferring mechanism and transferred to the bottom of the material-loading and stacking mechanism to the material frames in two directions. There is no need to suck or clamp the lead frames, and the lead frames conveyed by the two conveyor belts can be simultaneously received and transferred and automatically stacked to the material frames, thereby reducing labor costs and strength and improving stacking efficiency.

Description

Technical Field

[0001] The present application relates to semiconductor device manufacturing technology, and in particular to a lead frame conveying and stacking tool in semiconductor device packaging. Background Art

[0002] In the preparation of semiconductor devices, it is generally necessary to paste the relevant chips on the specified position of the lead frame, such as the base island, and then connect the chip to the corresponding pins of the lead frame by wire bonding, and then seal the chip and the frame together by plastic sealing, and then cut them by punching to obtain semiconductor devices. Before gluing the core, the lead frame needs to be stacked in the material frame, and then the material frame is placed in the specified position of the core gluing machine so that the core gluing machine can transport the lead frame for core gluing.

[0003] At present, the lead frame is generally punched and broken through a combination die for multiple times, then transported out through a conveyor belt, and then picked up and stacked into a material frame by humans at the end of the conveyor. This method is labor-intensive and there is a risk of scratching the hands, so it is necessary to improve it. Summary of the invention

[0004] In order to solve the above-mentioned defects of the prior art, the present application provides a lead frame conveying and stacking tool, which is used in the semiconductor device packaging process. There is no need to suck or clamp the lead frame. The lead frames conveyed by two conveyor belts can be alternately transferred and automatically stacked on the material frame, thereby reducing labor costs and strength and improving stacking efficiency.

[0005] In order to achieve the above object, the present invention adopts the following technologies:

[0006] A lead frame conveying and stacking tool is provided at the conveying end of a pair of lead frame conveyor belts arranged at intervals, and the tool comprises:

[0007] A material-discharging mechanism provided at the end of the conveyor belt;

[0008] The receiving and transferring mechanism provided at the front end of the pushing direction of the material-dispensing mechanism is used to alternately receive and transfer the lead frames from the two conveyor belts. The material-dispensing mechanism is used to push the lead frames at the end of the conveyor belt to the receiving and transferring mechanism when the receiving and transferring mechanism receives the corresponding conveyor belt.

[0009] A material loading and stacking mechanism is arranged above the receiving and transferring mechanism;

[0010] The supporting mechanisms are arranged at both ends of the material feeding and stacking mechanism, and are used to carry the material frames conveyed. The material feeding and stacking mechanism is used to push the lead frames carried by the transfer mechanism and transferred to the bottom of the material feeding and stacking mechanism alternately to the material frames in two directions.

[0011] The beneficial effects of the present invention are:

[0012] 1. This tooling is used for stacking lead frames on material frames. When used, it is not necessary to suck or clamp the lead frames. The lead frames conveyed by two conveyor belts can be alternately transferred and automatically stacked on the material frame, which reduces labor costs and strength and improves stacking efficiency.

[0013] 2. Through the structure of the material frame bottom plate, the setting of the receiving plate and the setting of the supporting mechanism, it is convenient to receive the materials with a low drop, and it is also convenient to transfer and receive the materials on the material frame bottom plate after being fully stacked, so as to facilitate the transportation of the material frame to the next process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the tooling in the embodiment of the present application;

[0015] Figure 2 is a schematic diagram of a top view of the structure of a tooling according to an embodiment of the present application;

[0016] Figure 3 It is a schematic diagram of the structure of the material-diverting mechanism in an embodiment of the present application;

[0017] Figure 4 It is a schematic diagram of the structure of the transfer mechanism of the embodiment of the present application;

[0018] Figure 5 2 is a schematic diagram of the structure of the stacking feeding mechanism of the embodiment of the present application;

[0019] Figure 6 This is a schematic diagram of the material frame and receiving plate structure of an embodiment of the present application;

[0020] Description of reference numerals:

[0021] Conveyor belt-1;

[0022] Material shifting mechanism-2, horizontal frame-20, vertical shifting rod-21, horizontal connecting rod-22, guide limit head-23, shifting motor-24, rotating rod-25, driven gear-26, driving gear-27, guide plate-28;

[0023] Undertaking transfer mechanism-3, L-shaped bearing plate-31, rotating plate-32, rotating motor-33, supporting frame-34, inclined guide surface-35, diversion slope-36;

[0024] Feeding and stacking mechanism-4, linear screw-40, vertical cylinder-41, connecting frame-42, pushing plate-43, rubber pressure block-44, pressure rod-45;

[0025] Material frame-5, bottom plate-50, vertical side plate-51, through hole-52;

[0026] Support mechanism-6, receiving plate-60, lifting cylinder-61. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the implementation modes of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] The embodiment of the present application provides a lead frame conveying and stacking tool, which is arranged at the conveying end of a pair of lead frame conveyor belts 1 arranged at intervals, such as Figure 1 As shown, the tooling includes:

[0029] A material-discharging mechanism 2 is arranged at the end of the conveyor belt 1, a receiving and transferring mechanism 3 is arranged at the front end of the material-discharging mechanism 2 in the pushing direction, a material-loading and stacking mechanism 4 is arranged above the receiving and transferring mechanism 3, and a supporting mechanism 6 is arranged at both ends of the material-loading and stacking mechanism 4.

[0030] The receiving and transferring mechanism 3 is used to alternately receive and transfer lead frames from two conveyor belts 1, and the material shifting mechanism 2 is used to push the lead frames at the end of the conveyor belt 1 to the receiving and transferring mechanism 3 when the receiving and transferring mechanism 3 receives the corresponding conveyor belt 1; the supporting mechanism 6 is used to carry the conveyed material frame 5, and the loading and stacking mechanism 4 is used to push the lead frames carried on the receiving and transferring mechanism 3 and transferred to the bottom of the loading and stacking mechanism 4 alternately to the material frames 5 in two directions.

[0031] When in use, the two conveyor belts 1 alternately step and transport the lead frames to be stacked / overlaid. When reaching the end of the conveyor belt 1, the receiving and transferring mechanism 3 rotates to receive one of the conveyor belts 1, and then the material-dispensing mechanism 2 transfers the lead frame on the corresponding conveyor belt 1 to the receiving and transferring mechanism 3, and then the receiving and transferring mechanism 3 rotates. After the rotation, the loading and stacking mechanism 4 pushes the lead frame just received to the material frame 5 in one direction. At the same time, the receiving and transferring mechanism 3 receives the other conveyor belt 1 and receives the lead frame from the material-dispensing mechanism 2 on the other conveyor belt 1, and repeats the receiving and pushing process alternately.

[0032] In this example, as a preferred example of the transfer mechanism 3, Figure 3 As shown, it includes: an L-shaped bearing plate 31, a rotating motor 33, etc. The rotating motor 33 is a forward and reverse motor.

[0033] The L-shaped supporting plate 31 is arranged horizontally, and includes two vertically connected plates of equal length, with limiting side plates on both sides of the plate bodies, and the limiting side plates form inclined guide surfaces 35 at the outer ends of the plate bodies; the rotating motor 33 is connected to the supporting frame 34, and its output end passes through the supporting frame 34 and is connected to the rotating plate 32, and the rotating plate 32 is connected to the L-shaped supporting plate 31.

[0034] When the L-shaped carrying plate 31 rotates with the rotating plate 32 until one of the plates is flush with one of the conveyor belts 1, the other plate is located just below the loading and stacking mechanism 4, and the inner end of the other plate faces the material frame 5 in place on one of the supporting mechanisms 6.

[0035] When the L-shaped carrier plate 31 rotates forward 90°, one of the plates is connected to one of the conveyor belts 1, and the other plate is located directly below the loading and stacking mechanism 4 so that the loading and stacking mechanism 4 can push the lead frame on the plate to the material frame 5; when the carrier plate 31 rotates backward 90°, the plate that was just connected to the conveyor belt 1 rotates with the carried lead frame to the loading and stacking mechanism 4 for pushing; and the plate that was just below the loading and stacking mechanism 4 rotates to connect to the other conveyor belt 1. In this way, the lead frames are alternately received from the two conveyor belts 1, and the lead frames on different plates are alternately pushed in two directions by the loading and stacking mechanism 4.

[0036] In this example, if Figure 4 The figure shows a preferred structure of the feeding stacking mechanism 4, which includes: a linear screw 40, a vertical cylinder 41 arranged at the movable end of the linear screw 40, and a push plate 43 connected to the movable end of the vertical cylinder 41 through a connecting frame 42, a plurality of pressure rods 45 are arranged in an array on the push plate 43, a rubber pressure block 44 is provided at the bottom end of the pressure rod 45, the top of the pressure rod 45 is located above the top surface of the push plate 43, and a limit block is provided at the top, a top pressure spring is passed through the pressure rod 45, and the top pressure spring is located between the rubber pressure block 44 and the bottom surface of the push plate 43.

[0037] When it is necessary to push the lead frame on the plate body issued below, the push plate 43 is lowered by the vertical cylinder 41, so that the rubber pressure block 44 contacts and slightly presses the lead frame. At this time, the top pressure spring acts to enable the rubber pressure block 44 to maintain a certain buffer and pressure on the lead frame. Then, the linear screw 40 is used to move in the required direction to drive the push plate 43 and the rubber pressure block 44 to drag the lead frame along the plate body toward the inner end of the plate body to discharge the material into the material frame 5. Specifically, the limiting side plate of the plate body will guide and limit the lead frame when it is fed into the material, and then, when discharging the material, the limit of the lead frame will be maintained, which is conducive to the alignment of the material to the material frame 5.

[0038] At the same time, in order to facilitate the discharge of materials, preferably, a section from the middle of the plate body to the inner end of the plate body is a downwardly inclined guide slope 36, that is, the guide slope 36 of the plate body is inclined toward the inner end of the plate body, that is, the discharge end, to facilitate the discharge of materials, and the top pressure spring can keep the rubber pressure block 44 in contact with the lead frame at all times to ensure effective dragging.

[0039] In this example, when the lead frame is transferred from the conveyor belt 1 to the L-shaped carrier plate 31, specifically, the following is adopted: Figure 3 The material shifting mechanism 2 shown in the figure comprises a pair of shifting components arranged on the horizontal frame 20 and symmetrically arranged with the conveyor belt 1. Specifically, the shifting components here comprise:

[0040] A toggle motor 24 connected to the cross frame 20, whose output shaft is provided with a driving gear 27;

[0041] A rotating rod 25 rotatably connected to the cross frame 20 is provided with a driven gear 26 meshing with a driving gear 27;

[0042] A horizontal connecting rod 22 connected to the rotating rod 25 has a vertical lever 21 connected to its outer end. The vertical lever 21 is inserted through the horizontal connecting rod 22, has a rubber head at its bottom end, and a top end is located above the horizontal connecting rod 22. A guide limit head 23 is provided at the top end. A return spring is inserted through the vertical lever 21. The return spring is located between the guide limit head 23 and the horizontal connecting rod 22. The guide limit head 23 has a guide inclined surface.

[0043] The guide plate 28 is disposed above the conveyor belt 1 and connected to the horizontal frame 20 . The projection of the guide plate 28 covers a portion of the rotation track of the vertical lever 21 .

[0044] When the vertical lever 21 is in a natural state, its bottom end is at a predetermined distance from the surface of the conveyor belt 1, and its top end is at a predetermined distance above the bottom surface of the guide plate 28. The rubber head has a certain elasticity.

[0045] When the lead frame arrives at the end with the conveyor belt 1, the output shaft of the toggle motor 24 rotates, and the driving gear 27 drives the driven gear 26 and the rotating rod 25 to rotate, thereby driving the horizontal connecting rod 22 to rotate, so that the vertical lever 21 rotates. When the vertical lever 21 enters above the conveyor belt 1 and begins to enter the coverage area of ​​the guide plate 28, the top end of the vertical lever 21 contacts the guide plate 28. Under the action of the guiding inclined surface, the vertical lever 21 is guided downward, the return spring is compressed, and the rubber head at the bottom end of the vertical lever 21 contacts the lead frame. Due to the elastic material of the rubber head, it will maintain contact with the lead frame and have a certain pressure. With continued rotation, the lead frame will be pushed toward the L-shaped carrier plate 31 under the action of a pair of vertical levers 21; and because the limiting side plate at the outer end / front end of the plate body has an inclined guide surface 35, the lead frame pushed by the vertical lever 21 will be guided into the plate body. When the vertical lever 21 rotates to leave the guide plate 28, the top end thereof is out of contact with the guide plate 28, and under the action of the return spring, the vertical lever 21 moves upward and returns to a natural state.

[0046] Specifically, as a preference, the output shaft transfer speed of the control motor 24 can be adjusted according to the rotation rhythm of the transfer mechanism 3 to match the transfer rhythm.

[0047] like Figure 1 , Figure 6 As shown, the top surface bearing part of the support mechanism 6 is L-shaped, one side is used to receive the material frame 5 conveyed, and the other side is used to convey the material frame 5 with the stacked lead frame to the next process. The intersection of the two sides is a loading station, which is provided with a lifting hole, and the outer side of the top surface bearing part is provided with a limiting side fence. A pair of lifting cylinders 61 are provided below the loading station, and the movable end of the lifting cylinder 61 is connected with a receiving plate 60. The material frame 5 includes a bottom plate 50 with a through hole 52, and vertical side plates 51 formed on both sides and one end of the bottom plate 50. The other end of the bottom plate 50 is a feeding channel, and the receiving plate 60 is used to receive the lead frame pushed by the loading stacking mechanism 4. The size of the receiving plate 60 is set to pass through the lifting hole and the through hole 52.

[0048] When the delivered material frame 5 is located at the loading station and abuts against the limiting side fence, the through hole 52 is correspondingly located above the lifting hole. The lifting cylinder 61 can make the receiving plate 60 pass through the lifting hole and the through hole 52 at the same time. When the lead frame pushed by the loading stacking mechanism 4 begins to be received, the lifting height can be higher at the beginning to reduce the drop when it is pushed. As the material is continuously received, the lifting cylinder 61 continuously lowers the receiving plate 60. Finally, when it is fully stacked, the receiving plate 60 drops below the supporting mechanism 6. At this time, the lead frame stack received by the receiving plate 60 and limited by the vertical side plate 51 will be carried on the bottom plate 50 and can be transported to the next process.

[0049] The vertical side plate 51 is hollowed out to facilitate taking out the lead frame stacked therein from the side when necessary.

[0050] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A lead frame conveying and stacking tool, arranged at the conveying end of a pair of lead frame conveyor belts (1) arranged at intervals, characterized in that the tool include: A material dispensing mechanism (2) provided at the end of the conveyor belt (1); A receiving and transferring mechanism (3) disposed at the front end of the material shifting mechanism (2) in the pushing direction is used to alternately receive and transfer lead frames from the two conveyor belts (1); the material shifting mechanism (2) is used to push the lead frame at the end of the conveyor belt (1) toward the receiving and transferring mechanism (3) when the receiving and transferring mechanism (3) receives the corresponding conveyor belt (1); A material loading and stacking mechanism (4) disposed above the receiving and transferring mechanism (3); Support mechanisms (6) are provided at both ends of the material stacking and conveying mechanism (4), the support mechanisms (6) are used to carry the material frames (5) conveyed, and the material stacking and conveying mechanism (4) is used to push the lead frames carried by the receiving and transferring mechanism (3) and transferred to the bottom of the material stacking and conveying mechanism (4) alternately to the material frames (5) in two directions; The transfer-taking institutions (3) include: An L-shaped load-bearing plate (31) is arranged horizontally and comprises two vertically connected plates of equal length, both sides of the plates are provided with limiting side plates, and the limiting side plates are formed with inclined guide surfaces (35) at the outer ends of the plates; A rotating motor (33) is connected to a support frame (34), an output end of which passes through the support frame (34) and is connected to a rotating plate (32), and the rotating plate (32) is connected to an L-shaped bearing plate (31); When the L-shaped carrying plate (31) rotates along with the rotating plate (32) until one of the plates is flush with one of the conveyor belts (1), the other plate is located just below the material loading and stacking mechanism (4), and the inner end of the other plate is facing the material frame (5) that has been in place on one of the supporting mechanisms (6); The stacking feeding mechanism (4) comprises: Linear screw (40); A vertical cylinder (41) provided at the moving end of the linear lead screw (40); A push plate (43) is connected to the movable end of the vertical cylinder (41) via a connecting frame (42), and a plurality of pressure rods (45) are arranged in an array on the push plate (43). The bottom ends of the pressure rods (45) have rubber pressure blocks (44), and the tops of the pressure rods (45) are located above the top surface of the push plate (43) and have a limit block on the top. A top pressure spring is passed through the pressure rods (45), and the top pressure spring is located between the rubber pressure block (44) and the bottom surface of the push plate (43).

2. The lead frame conveying and stacking tool according to claim 1, characterized in that: A section from the middle of the plate body to the inner end of the plate body is a flow guiding slope (36) inclined downward.

3. The lead frame conveying and stacking tool according to claim 1, characterized in that: The material shifting mechanism (2) comprises a pair of shifting components which are arranged on the horizontal frame (20) and are symmetrically arranged with the conveyor belt (1), and the shifting components comprise: A toggle motor (24) connected to the cross frame (20), wherein the output shaft of the toggle motor (24) is provided with a driving gear (27); A rotating rod (25) rotatably connected to the cross frame (20) and provided with a driven gear (26) meshing with the driving gear (27); A horizontal connecting rod (22) connected to the rotating rod (25) has its outer end connected to a vertical lever (21), the vertical lever (21) is inserted through the horizontal connecting rod (22), has a rubber head at its bottom end, and its top end is located above the horizontal connecting rod (22), and a guide limit head (23) is provided at the top end, a return spring is inserted through the vertical lever (21), and the return spring is located between the guide limit head (23) and the horizontal connecting rod (22), and the guide limit head (23) has a guide inclined surface; The guide plate (28) is arranged above the conveyor belt (1) and connected to the horizontal frame (20), and the projection of the guide plate (28) covers part of the rotation track of the vertical lever (21).

4. The lead frame conveying and stacking tool according to claim 1, characterized in that: The top surface bearing portion of the support mechanism (6) is L-shaped, one side is used to receive the material frame (5) being transported, and the other side is used to transport the material frame (5) with stacked lead frames to the next process. The intersection of the two sides is a loading station, which is provided with a lifting hole. The outer side of the top surface bearing portion is provided with a limiting side fence. A pair of lifting cylinders (61) are provided below the loading station. The movable ends of the lifting cylinders (61) are connected to a receiving plate (60). The material frame (5) includes a bottom plate (50) with a through hole (52), and vertical side plates (51) formed on both sides and one end of the bottom plate (50). The other end of the bottom plate (50) is a material feeding channel. The receiving plate (60) is used to receive the lead frame pushed by the loading and stacking mechanism (4).

5. The lead frame conveying and stacking tool according to claim 4, characterized in that: When the delivered material frame (5) is located at the loading station and abuts against the limiting side fence, the through hole (52) is correspondingly located above the lifting hole, and the receiving plate (60) is simultaneously passed through the lifting hole and the through hole (52) by the lifting cylinder (61).

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