WO2021088568A1

WO2021088568A1 - Lead frame feeding frame having automatic fixing function

Info

Publication number: WO2021088568A1
Application number: PCT/CN2020/118428
Authority: WO
Inventors: 邱焕枢; 麦有海; 张国光; 姚剑锋; 赖志雄; 李伟光
Original assignee: 佛山市蓝箭电子股份有限公司
Priority date: 2019-11-08
Filing date: 2020-09-28
Publication date: 2021-05-14

Abstract

Disclosed in the present utility model is a lead frame feeding frame having an automatic fixing function, comprising an outer frame, a plurality of cavities having the same structure being arranged in the outer frame, wherein an inner frame is provided in each cavity; fixing seats are provided at four corners of the frame and joints of transverse connecting rods and the frame, and rotatable rotary rods are provided in the direction of the transverse connecting rod. One end of each rotary rod is movably connected to the fixing seat, and the other end sequentially penetrates through the fixing seats arranged in parallel and extends out. One end of each rotary rod is sleeved with a reset spring and provided with a touch rod capable of driving the rotary rod to rotate. The inner frames are provided with a plurality of first stop pieces and second stop pieces used for supporting a lead frame. The rotary rods are provided with pressing blocks which correspond to the plurality of first stop pieces and are in contact with the first stop pieces, and the pressing blocks can rotate along with the rotary rods. The feeding frame can effectively avoid dislocation and deformation of lead frames in a process of transferring the feeding frame to a plastic package mold, production costs and operation intensity of workers are reduced, and the production efficiency is improved.

Description

Lead frame loading rack with automatic fixing function

Technical field

The utility model relates to the technical field of semiconductor packaging, in particular to a lead frame loading rack with an automatic fixing function.

Background technique

As the chip carrier of the semiconductor integrated circuit, the lead frame is a key structural component that realizes the electrical connection between the internal circuit lead end of the chip and the outer lead by means of bonding materials (gold wire, aluminum wire, copper wire) to form an electrical circuit. It serves as a bridge connecting with external wires. Lead frames are needed in most semiconductor integrated circuits, which are important basic materials in the electronic information industry.

With the vigorous development of the electronics industry, in the subsequent packaging process of semiconductor products, especially integrated circuit chips, in order to facilitate the access and transmission of the lead frame, it is necessary to fill the lead frame on the loading rack by a chip layout machine. The existing loading frame has a single structure, and the position of the lead frame is limited by a simple top sheet and positioning pins. Dislocation and deformation of the lead frame are likely to occur in the process of transferring to the plastic molding mold, which will cause waste products in the next plastic packaging process. Increase production costs and reduce production efficiency.

technical problem

Generally, in order to ensure that the lead frame is not easily misaligned and deformed during the transfer of the loading rack to the plastic mold, it is usually necessary to cover the loading rack with a cover, and then the loading rack, lead frame, and cover are manually or mechanically moved. And put it into a plastic mold for packaging. However, the setting of the cover plate can easily increase the operation steps, resulting in a slow progress in the entire production process, which improves the operation intensity of the workers and reduces the production efficiency.

It can be seen that the existing technology needs to be improved.

Technical solutions

In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a lead frame loading rack with automatic fixing function, which aims to solve the dislocation and deformation of the lead frame during the transfer of the loading rack to the plastic mold The problem.

In order to achieve the above purpose, the present utility model adopts the following technical solutions:

A lead frame loading rack with an automatic fixing function includes an outer frame, the outer frame includes a rectangular frame, a plurality of horizontal connecting rods and longitudinal connecting rods inside the frame; the horizontal connecting rods and the longitudinal connecting rods The connecting rod divides the inside of the frame into a plurality of cavities with the same structure, wherein each cavity is provided with an inner frame; the four corners of the frame and the connection between the horizontal connecting rod and the frame are provided with fixing seats , The fixing seat is provided with a rotatable rotating rod along the transverse connecting rod direction; one end of the rotating rod is sleeved with a return spring and is provided with a touch rod that can drive the rotating rod to rotate, and one end of the reset spring is fixed with the touch rod The other end is fixedly connected to the fixing seat; the inner side of the transverse frame of the inner frame is symmetrically provided with a plurality of first top sheets for supporting the lead frame, and the inner side of the longitudinal frame of the inner frame is also symmetrically provided with a plurality of first top sheets The second top sheet is used to support the lead frame, and the second top sheet is vertically provided with positioning pins; the rotating rods are respectively corresponding to a plurality of first top sheets and are fixedly provided with pressing blocks that can contact the first top sheets.

In the lead frame loading rack with automatic fixing function, the connection between the longitudinal connecting rod and the frame and the connecting position between the horizontal connecting rod and the longitudinal connecting rod are provided with fixing seats.

In the lead frame loading rack with automatic fixing function, the front end of the first top sheet and the front end of the second top sheet are respectively provided with a first recessed platform and a second recessed platform for receiving the lead frame.

In the lead frame loading rack with automatic fixing function, the positioning pin is arranged on the second concave platform .

In the lead frame loading rack with automatic fixing function, the pressing block includes a base and a pressing table arranged on the base.

In the lead frame loading rack with automatic fixing function, a support table for supporting the inner frame is provided around the inner side of the cavity.

In the lead frame loading rack with automatic fixing function, the frame, the horizontal connecting rod and the longitudinal connecting rod are integrally formed.

In the lead frame loading rack with automatic fixing function, the rotating rod is a circular column, and the fixing seat is provided with a through hole suitable for the rotation of the rotating rod.

In the lead frame loading rack with an automatic fixing function, the rotating rod is a circular pillar, and the through hole is a circular through hole.

In the lead frame loading rack with automatic fixing function, one end of the through hole is provided with an annular concave surface around the hole wall, and one end of the rotating rod movably connected to the fixing seat is provided with a sleeve on the annular concave surface Ring boss.

Beneficial effect

Compared with the prior art, the present utility model provides a lead frame loading rack with automatic fixing function. The design is novel, and the sheet arranging machine does not require major changes, which can effectively prevent the loading rack from being transferred to the plastic packaging mold. The lead frame is misaligned and deformed, which reduces the production cost and the operating strength of workers, and improves production efficiency.

Description of the drawings

Fig. 1 is a structural schematic diagram of a lead frame loading rack with automatic fixing function provided by the present invention.

Fig. 2 is a state diagram of a lead frame upper material frame with an automatic fixing function provided by the utility model for fixing the lead frame.

Figure 3 is a state diagram of a lead frame loading rack with an automatic fixing function provided by the utility model after the lead frame is fully lined up.

Figure 4 is a schematic diagram of the structure of the outer frame in the specific implementation provided by the utility model.

Fig. 5 is a schematic diagram of the structure of the inner frame in the specific embodiment provided by the utility model.

Embodiments of the present invention

The utility model provides a lead frame loading rack with an automatic fixing function. In order to make the purpose, technical solution and effect of the utility model clearer and clearer, the utility model will be further described in detail with reference to the drawings and embodiments. . It should be understood that the specific embodiments described here are only used to explain the present utility model, and are not used to limit the present utility model.

Please refer to Figure 1, Figure 2, Figure 3, Figure 4 and Figure 5, a lead frame loading rack with automatic fixing function, including an outer frame 1, the outer frame 1 includes a rectangular structure frame 11, frame 11 A plurality of horizontal connecting rods 12 and longitudinal connecting rods 13 are arranged criss-crossed inside; the horizontal connecting rods 12 and the longitudinal connecting rods 13 divide the inside of the frame 11 into a plurality of cavities 14 with the same structure. There is an inner frame 2; the four corners of the frame 11 and the connection between the horizontal connecting rod 12 and the frame 11 are provided with a fixing seat 3, and the fixing seat 3 is provided with a rotatable rotating rod 4 along the direction of the horizontal connecting rod 12 ; In order to facilitate the simultaneous fixing of the lead frame 7 on both sides of the transverse connecting rod 12, the fixing seat 3 provided on the transverse connecting rod 12 can simultaneously pass through two rotating rods 4, while the fixing seat located on the frame 11 only needs to pass through one Rotating rod 4; one end of the rotating rod 4 is movably connected to the fixed seat 3, and the other end passes through the fixed seat 3 arranged in parallel and then extends; the extending end of the rotating rod 4 is covered with a return spring 5 and is provided with a movable rotating rod 4 Rotating touch rod 6, one end of the return spring 5 is fixedly connected to the touch rod 6, and the other end is fixedly connected to the fixed seat 3; the inner frame 2 is composed of a horizontal frame 21 arranged in parallel and a longitudinal frame 22 arranged in parallel. The inner side of the horizontal frame body 21 of the frame 2 is symmetrically provided with a plurality of first top sheets 8 for supporting the lead frame 7, and the inner side of the longitudinal frame body 22 of the inner frame 2 is also provided with a plurality of second top sheets for supporting the lead frame 7 symmetrically. The top sheet 9 and the second top sheet 9 are vertically provided with positioning pins 92; the rotating rods 4 respectively correspond to a plurality of first top sheets 8 and are fixedly provided with a pressing block 10 that can contact the first top sheet 8, and the pressing block 10 can Follow the rotating rod 4 to rotate.

The lead frame loading rack with automatic fixing function provided by the specific implementation of this specification is designed into a 1X4 form by a horizontal connecting rod 12 and a longitudinal connecting rod 13 (that is, the outer frame 1 has four cavities 14 with the same structure). The cavity 14 is provided with an inner frame 2 into which a lead frame 7 can be placed. The lead frame 7 is supported by two parallel first top sheets 8 and two symmetrically arranged second top sheets 9 on the inner frame 2. The four corners of the frame 11 and the connection between the horizontal connecting rod 12 and the frame 11 are provided with a fixing seat 3. The rotating rods 4 that can be driven by the touch rod 6 are inserted between the fixed seats 3 arranged in parallel; for a 1X4 type loading rack, the total number of rotating rods 4 required is four; the rotating rod 4 is provided with a rotating rod 4 The rotating pressing block 10, the pressing block 10 and the actuating rod 6 are always in the same direction, and as shown in Figure 1, when the loading frame is not placed in the lead frame 7, the pressing block 10 and the first top sheet 8 remain in contact The number of the pressing blocks 10 is the same as the number of the first top sheet 8 to be contacted. In addition, one end of the rotating rod 4 extends out of the fixing seat 3 and is sheathed with a return spring 5, one end of the return spring 5 is fixedly connected to the fixed seat 3, and the other end is fixedly connected to the actuating rod 6.

Please refer to Fig. 1, in order to facilitate the realization of the effect of the specific implementation of the present utility model, it is necessary to simply add ejector rods 19 corresponding to the number of touch rods 6 on the existing sheet arranging machine table 18. The height of the ejector rods 19 is higher than the feeding The height of the rotating rod 4 when it is placed on the table 18. When the loading rack is on the table 18, the ejector rod 19 is just set at a position that can hold the touch rod 6 to rotate vertically upwards and ensure that the ejector rod 19 is in contact with the touch rod 6 rotating in the vertical direction.

The working principle of the specific embodiment of the utility model is as follows: Please refer to Figure 1 and Figure 2. When the inner frame 2 needs to be discharged into the lead frame 7 on the sheet discharging machine, the loading frame can be smoothly contacted with the sheet discharging machine table 18, and the touch rod 6 Rotating vertically upward under the action of the ejector rod 19 which is higher than the height of the rotating rod 4 will drive the rotating rod 4 to rotate. The pressure block 10 that can rotate with the rotating rod 4 is in the same direction as the touch rod 6 and will also be with the touch rod 6 Rotate upwards in the same way, so that the pressing block 10 is away from the first top sheet 8 and perpendicular to the rotating rod 4, at this time, the sheet discharging machine can discharge the inner frame 2 into the lead frame 7. At the same time, the return spring 5 connected between the fixed seat 3 and the touch rod 6 will inevitably be tightened around the rotating rod 4. The return spring 5 will generate a certain resilience force F for reset; when the loading rack is full of the lead frame 7, Manual or manipulator transfers the loading rack from the film arranging machine. At this time, the touch rod 6 is no longer in contact with the restriction of the ejector rod 19. In order to reset, the return spring 5 drives the touch rod 6 to rotate vertically downward through the resilient force F, thereby driving the rotation The rod 4 rotates; correspondingly, the pressing block 10 rotates downward, as shown in FIG. 3, and finally the pressing block 10 contacts the first top plate 8, and the rotating rod 4 no longer rotates, so that the first top plate 8 supports and presses The block 10 is pressed down to fix the lead frame 7.

In addition, the second top sheet 9 is provided with a positioning pin 92 that can pass through the lead frame 7. The positioning pin 92 can pass through a circular hole on the lead frame 7 to provide a good effect on the area where the lead frame 7 is located on the second top sheet 9. Positioning and fixing effect. Because the lead frame 7 is located in the area of the first top sheet 8 and is also fixed by the pressing block 10, and the lead frame 7 is fixed by the pressing block 10 and the positioning pin 92, the lead frame 7 is effectively avoided during the transfer of the loading frame to the plastic mold. The frame 7 is misaligned and deformed.

Please refer to FIG. 1, FIG. 2 and FIG. 3. In some embodiments, the connection between the longitudinal connecting rod 13 and the frame 11 and the connection between the horizontal connecting rod 12 and the longitudinal connecting rod 13 are provided with a fixing seat 3. Since the rotating rod 4 is provided with multiple sets of pressing blocks 10, through this arrangement, the structural stability of the rotating rod 4 can be further improved, and the service life of the rotating rod 4 can be increased.

Referring to FIG. 5, in some embodiments, the front end of the first top sheet 8 and the front end of the second top sheet 9 are respectively provided with a first recessed platform 81 and a second recessed platform 91 for receiving the lead frame 7. The lead frame 7 has a certain thickness. By providing the first recessed platform 81 and the second recessed platform 91, the height of the first recessed platform 81 and the second recessed platform 91 is close to the thickness of the lead frame 7, and the lead frame 7 can be improved. The positioning function also facilitates the pressing block 10 to contact the lead frame 7 and the first top sheet 8 at the same time, so as to better fix the lead frame 7.

Further, the positioning pin 92 is provided on the second concave platform 91 of the second top sheet 9.

Please refer to FIG. 1, FIG. 2 and FIG. 3. In some embodiments, the pressing block 10 includes a base 101 and a pressing table 102 provided on the base 101. The base 101 is fixedly installed on the rotating rod 4 and can be rotated together with the rotating rod 4; the width of the pressing table 102 is close to the width of the first top piece 8. When the base 101 rotates with the rotating rod to above the corresponding first top piece 8 , The fixing surface of the pressing table 102 can be substantially attached to the top surface of the first top sheet 8 to effectively fix the lead frame 7.

Please refer to FIG. 4, in some embodiments, a support platform 15 for supporting the inner frame 2 is provided around the inner side of the cavity 14.

In some embodiments, the frame 11, the horizontal connecting rod 12 and the longitudinal connecting rod 13 are integrally formed. The loading rack can not only be designed in the form of 1X4, but in order to meet the needs of the loading rack to accommodate different numbers of lead frames 7, the loading rack can also be designed in the form of 1X2, 1X6.

In some embodiments, the rotating rod 4 is a circular pole, and the fixing seat 3 is provided with a through hole 31 suitable for the rotation of the rotating rod 4.

Further, one end of the through hole 31 is provided with an annular concave surface around the hole wall, and one end of the rotating rod 4 movably connected to the fixing seat 3 is provided with an annular boss (not shown in the figure) sleeved on the annular concave surface. The rotating rod 4 can be penetrated by the end of the through hole with the annular concave surface. When the rotating rod 4 passes through the fixing seat 3 arranged in parallel, the end of the rotating rod 4 with the annular boss can fit into the fixing seat. 4 There will be no looseness during rotation.

In summary, the utility model provides a lead frame loading rack with automatic fixing function. The design is novel, and the sheet discharging machine does not need major changes, which can effectively avoid the lead frame during the transfer of the loading rack to the plastic mold. Dislocation and deformation occur, reducing production costs and workers' operating strength, and improving production efficiency.

It can be understood that for those of ordinary skill in the art, equivalent replacements or changes can be made according to the technical solution of the utility model and the concept of the utility model, and all these replacements or changes shall belong to the appended claims of the utility model Within the scope of protection of the book.

Claims

A lead frame loading rack with an automatic fixing function includes an outer frame, the outer frame includes a rectangular frame, a plurality of horizontal connecting rods and longitudinal connecting rods inside the frame; the horizontal connecting rods and the longitudinal connecting rods The connecting rod divides the inside of the frame into a plurality of cavities with the same structure, and is characterized in that: each cavity is provided with an inner frame; the four corners of the frame and the connection between the horizontal connecting rod and the frame are provided A fixed seat, the fixed seat is provided with a rotatable rotating rod along the transverse connecting rod direction; one end of the rotating rod is sleeved with a return spring and is provided with a touch rod that can drive the rotating rod to rotate, and one end of the reset spring is connected to the touch The rod is fixedly connected, and the other end is fixedly connected to the fixing seat; the inner side of the transverse frame of the inner frame is symmetrically provided with a plurality of first top sheets for supporting the lead frame, and the inner side of the longitudinal frame of the inner frame is also symmetrically provided A plurality of second top sheets are used for supporting the lead frame, and the second top sheets are vertically provided with positioning pins; the rotating rods are respectively corresponding to the plurality of first top sheets and are fixedly provided with pressing blocks that can contact the first top sheets.
The lead frame loading rack with automatic fixing function according to claim 1, characterized in that: the connection between the longitudinal connecting rod and the frame and the connection between the horizontal connecting rod and the longitudinal connecting rod are all provided with fixing seat.
The lead frame loading rack with automatic fixing function according to claim 1, characterized in that: the front end of the first top sheet and the front end of the second top sheet are respectively provided with a first recess for receiving the lead frame And the second concave platform.
The lead frame loading rack with automatic fixing function according to claim 3, characterized in that: the positioning pin is arranged on the second concave platform.
The lead frame loading rack with automatic fixing function according to claim 1, wherein the pressing block comprises a base and a pressing table arranged on the base.
The lead frame loading rack with automatic fixing function according to claim 1, characterized in that: a support platform for supporting the inner frame is provided around the inner side of the cavity.
The lead frame loading rack with automatic fixing function according to claim 1, wherein the frame, the horizontal connecting rod and the longitudinal connecting rod are integrally formed.
The lead frame loading rack with automatic fixing function according to claim 1, wherein the rotating rod is a circular pole, and the fixing seat is provided with a through hole suitable for the rotation of the rotating rod.
The lead frame loading rack with automatic fixing function according to claim 8, characterized in that: one end of the through hole is provided with an annular concave surface around the wall of the hole, and the rotating rod is movably connected to one end of the fixing seat An annular boss sleeved on the annular concave surface is provided.