A semiconductor lead frame packaging raw material feeding system

Abstract

A semiconductor lead frame packaging raw material feeding system belongs to the technical field of equipment for manufacturing semiconductor devices. The feeding system includes: a hopper with a through hole at the bottom, and the through hole is arranged in a one-to-one correspondence with the sleeve on the transfer frame. A drop tube is passed through the through hole, and the drop tube is arranged to move in the vertical direction. The lower end of the drop tube is provided with a wedge block arranged to move in the radial direction, and a return spring is provided on the outside of the drop tube. A fixed shaft is provided on the outside of the drop tube, and the middle section of a lever is connected to the fixed shaft, and the lower end of the lever is rotatably connected to the outer end of the wedge block. A through hole is radially opened on the side wall of the drop tube corresponding to the upper side of the fixed shaft, and a baffle is passed through the through hole. The outer end of the baffle is arranged at the upper end of the lever, and the distance between the bottom surface of the baffle and the top surface of the wedge block is consistent with the height of the plastic raw material. This solution can automatically feed the plastic raw material onto the transfer frame, reducing the operator's workload.

Description

Technical Field

[0001] The invention belongs to the technical field of equipment for manufacturing semiconductor devices, and in particular relates to a semiconductor lead frame packaging raw material feeding system. Background Art

[0002] Semiconductor devices are typically fabricated on copper or aluminum lead frames through processes such as gluing, die bonding, die attach, bonding, and packaging. During packaging, the bonded lead frame and plastic resin are placed between the lower and upper injection molds using a transfer frame. The package is then formed in a predetermined location on the lead frame using a prefabricated mold cavity.

[0003] like Figure 7 As shown, the transfer frame is usually equipped with multiple sleeves for plastic resin materials in an array. The plastic resin materials are mostly cylindrical in structure, while the sleeves are round tubes. In the semiconductor packaging process, an operator at a station usually needs to complete multiple tasks such as placing the lead frame, placing the plastic resin materials, controlling the injection molding equipment, removing and organizing the lead frame, etc. The work content is relatively complicated. In the existing production process, the work of placing the plastic resin materials is mainly completed manually by the operator. The operator removes the plastic resin materials from the packaging box and then places the plastic resin materials into the sleeves one by one, which is relatively time-consuming. Summary of the Invention

[0004] In order to solve the deficiencies of the existing technology, the present invention provides a semiconductor lead frame packaging raw material feeding system, which can automatically feed plastic resin raw materials onto the transfer frame, reducing the operator's workload.

[0005] In order to achieve the purpose of the present invention, the following scheme is proposed:

[0006] A semiconductor lead frame packaging raw material feeding system comprises a hopper with a plurality of through holes on the bottom. The through holes are arranged in one-to-one correspondence with the sleeves on the transfer frame.

[0007] A blanking tube is passed through the through holes. The blanking tube is arranged to move in the vertical direction. The inner diameter of the blanking tube matches the outer diameter of the plastic raw material. A wedge block is provided at the lower end of the blanking tube for movement in the radial direction. The inclined surface of the wedge block is inclined toward the bottom of the axis of the blanking tube. A reset spring is provided on the outside of the blanking tube. When the reset spring is in a natural state, the front end of the wedge block is located below the blanking tube.

[0008] A fixed shaft is provided on the outer side of the blanking tube along the tangential direction. The middle section of a lever is connected to the fixed shaft. The lever is movable along the length direction relative to the fixed shaft and swings around the fixed shaft. The lower end of the lever is rotatably connected to the outer end of the wedge block, and the axis of rotation is parallel to the fixed shaft.

[0009] A through hole is radially opened on the side wall of the blanking tube corresponding to the upper side of the fixed axis, and a baffle is passed through the through hole. The outer end of the baffle is arranged at the upper end of the lever, and the outer end of the baffle is movable relative to the length direction of the lever. The distance between the bottom surface of the baffle and the top surface of the wedge block is consistent with the height of the plastic fat raw material.

[0010] The beneficial effects of the present invention are: this scheme utilizes the process of the drop tube descending to automatically feed the material into the sleeve below, and can ensure that only one plastic fat raw material is fed at a time. At the same time, the plastic fat raw material in the hopper is pushed by the rising and falling method of the drop tube to increase the probability of the raw material entering the drop tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present invention.

[0012] Figure 1 Shown is a schematic diagram of the overall structure of this application.

[0013] Figure 2 Shown Figure 1 A partial enlarged view of point A in the middle.

[0014] Figure 3 A cross-sectional view showing the overall structure of the present application.

[0015] Figure 4 Shown Figure 3 A partial enlarged view of point B in the middle.

[0016] Figure 5 A cross-sectional view of the present application during feeding is shown.

[0017] Figure 6 Shown Figure 5 A partial enlarged view of point C in the middle.

[0018] Figure 7 The figure shows the overall structural diagram of the transfer frame.

[0019] Markings in the figure: hopper-1, through hole-11, drop pipe-2, fixed shaft-21, through hole-22, guide rod-23, wedge block-3, inclined surface-31, lever-4, strip hole-41, baffle-5, connecting shaft-51, return spring-6, frame-7, telescopic device-8, workbench-9, track-91. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments 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.

[0021] A semiconductor lead frame packaging raw material feeding system is used to feed the material to the sleeve on the transfer frame. The structure of the transfer frame is as follows: Figure 7 As shown. Figure 1 、 Figure 5 As shown, the feeding system includes a hopper 1 with a plurality of through holes 11 at its bottom, which are arranged one-to-one with the sleeves on the transfer frame. The hopper 1 is spaced above a workbench 9, which has a pair of parallel rails 91 for placing the transfer frame.

[0022] Specifically, such as Figures 2 to 6 As shown, a drop tube 2 is provided in each of the through holes 11. The drop tube 2 is arranged to move in the vertical direction. The inner diameter of the drop tube 2 matches the outer diameter of the plastic fat raw material, and the plastic fat raw material can automatically fall through the drop tube 2. When the drop tube 2 rises to the highest position, its top protrudes upward from the bottom surface of the inside of the hopper 1. During the interval of taking materials, by moving the drop tube 2 up and down and raising the drop tube 2 to the highest position each time, the upper end of the drop tube 2 can be used to push the plastic fat raw material accumulated inside the hopper 1, breaking the static state of the raw material in the hopper 1, so that the plastic fat raw material in the hopper 1 can enter the drop tube 2 more easily.

[0023] Specifically, such as Figure 2 、 Figure 4 and Figure 6 As shown, the lower end of the drop tube 2 is provided with a wedge block 3 which is arranged to move radially, and the inclined surface 31 of the wedge block 3 is inclined toward the bottom of the axis of the drop tube 2. A return spring 6 is provided on the outside of the drop tube 2. When the return spring 6 is in a natural state, the front end of the wedge block 3 is located below the drop tube 2.

[0024] Specifically, such as Figure 2 、 Figure 4 and Figure 6 As shown, a fixed shaft 21 is provided on the outer side of the blanking tube 2 along the tangential direction, and the middle section of a lever 4 is connected to the fixed shaft 21. The lever 4 is movable along the length direction relative to the fixed shaft 21 and is swinging around the fixed shaft 21. The lower end of the lever 4 is rotatably connected to the outer end of the wedge block 3, and the axis of rotation is parallel to the fixed shaft 21.

[0025] Specifically, such as Figure 4 As shown, a through hole 22 is radially opened on the side wall of the blanking tube 2 corresponding to the upper side of the fixed shaft 21, and a baffle 5 is passed through the through hole 22. The outer end of the baffle 5 is arranged at the upper end of the lever 4, and the outer end of the baffle 5 is movable relative to the length direction of the lever 4. The distance between the bottom surface of the baffle 5 and the top surface of the wedge block 3 is consistent with the height of the plastic fat raw material.

[0026] The hopper 1 is used to stack plastic fat raw materials, which automatically enter the drop tube 2 from the bottom of the hopper 1. The plastic fat raw materials entering the drop tube 2 are blocked by the front end of the wedge block 3, so that the plastic fat raw materials are temporarily stored in the drop tube 2; when placing the raw materials, first place the transfer frame under the hopper 1, and align the sleeve with the drop tube 2 one by one, and are in a separated state; then move the drop tube 2 downward, and during the descent of the drop tube 2, the inclined surface 31 will first contact the outer edge of the upper end of the sleeve, and as the drop tube 2 continues to descend, the sleeve will push the wedge block 3 to move to the outside of the drop tube 2 through the inclined surface 31 until the top surface of the sleeve contacts the bottom surface of the drop tube 2. At this time, the wedge block 3 is located on the outside of the sleeve, and the plastic fat raw material at the bottom end of the drop tube 2 will automatically fall down, thereby completing the placement of the raw materials. Working; at the same time, when the wedge block 3 moves toward the outside of the drop tube 2, the upper end of the lever 4 will drive the baffle 5 to move toward the inside of the drop tube 2, so that the inner end of the baffle 5 will be inserted between the two plastic fat raw materials at the bottom of the drop tube 2. When the plastic fat raw material at the bottom falls, the inner end of the baffle 5 will be inserted into the bottom of the upper plastic fat raw material, thereby preventing the upper plastic fat raw material from continuing to fall; when the raw material placement work is completed, move the drop tube 2 upward to separate the drop tube 2 from the sleeve. During the separation process, under the action of the reset spring 6, the wedge block 3 will automatically move toward the inside of the drop tube 2, thereby blocking the lower end of the drop tube 2, and the lever 4 will also drive the baffle 5 to move to the outside of the drop tube 2, thereby releasing the plastic fat raw material blocked above, allowing the plastic fat raw material to automatically fall, so as to facilitate the next discharge.

[0027] Preferably, a vibration motor is provided on the hopper 1 so that the plastic fat raw material continuously jumps inside the hopper 1, thereby increasing the probability of the plastic fat raw material entering the drop tube 2.

[0028] Preferably, Figure 2 、 Figure 4 As shown, a connecting shaft 51 is provided at the rear end of the baffle 5, and the connecting shaft 51 is parallel to the fixed shaft 21. The lever 4 is provided with a strip hole 41 corresponding to the connecting shaft 51 and the fixed shaft 21. The connecting shaft 51 and the fixed shaft 21 are slidably arranged in the corresponding strip hole 41. Through the above structural design, the strip hole 41 can be used to adapt to the change in the relative position between the lever 4 and the baffle 5 and the fixed shaft 21 during the swinging process, thereby achieving the purpose of moving the lever 4 relative to the fixed shaft 21 along the length direction and the outer end of the baffle 5 relative to the length direction of the lever 4.

[0029] Preferably, Figure 2 、 Figure 4 and Figure 6 As shown, a guide rod 23 is provided radially on the outside of the blanking tube 2. The guide rod 23 passes through the wedge block 3. The return spring 6 is sleeved on the guide rod 23 and is located between the end of the guide rod 23 and the wedge block 3. The return spring 6 is in a compressed state.

[0030] Preferably, Figure 2 As shown, there are at least three groups of wedge blocks 3, levers 4, fixed shafts 21 and baffles 5 arranged along the circumferential array of the blanking tube 2. This design not only ensures the blocking effect on the plastic fat raw material inside the blanking tube 2, but also plays a guiding role on the sleeve during the closing process of the blanking tube 2 and the sleeve, ensuring that the sleeve is aligned with the corresponding blanking tube 2.

[0031] Preferably, Figure 1 、 Figure 3 As shown, the drop tubes 2 are all installed on the same frame 7, and a telescopic device 8 is provided at the bottom of the hopper 1 for controlling the lifting and lowering of the frame 7, thereby achieving the purpose of simultaneously driving all the drop tubes 2 to move as a whole.

[0032] Preferably, Figure 6 As shown, the outer diameter of the blanking tube 2 is larger than the outer diameter of the sleeve, so that during the material removal process, the front end of the wedge block 3 is always below the bottom surface of the blanking tube 2, thereby ensuring that the wedge block 3 can be smoothly reset.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to be the only one or to limit the present invention. It should be understood by those skilled in the art that various changes or equivalent replacements made to the present invention without departing from the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A semiconductor lead frame packaging raw material feeding system, characterized in that: include: A hopper (1) has a plurality of through holes (11) formed at its bottom, and the through holes (11) are arranged in a one-to-one correspondence with the sleeves on the transfer frame; A drop tube (2) is provided in each through hole (11), the drop tube (2) is arranged to move in the vertical direction, the inner diameter of the drop tube (2) matches the outer diameter of the plastic resin raw material, the lower end of the drop tube (2) is provided with a wedge block (3) arranged to move in the radial direction, the inclined surface (31) of the wedge block (3) is inclined toward the bottom of the axis of the drop tube (2), and a return spring (6) is provided on the outside of the drop tube (2), and when the return spring (6) is in a natural state, the front end of the wedge block (3) is located below the drop tube (2); A fixed shaft (21) is provided on the outer side of the blanking tube (2) along the tangential direction, a middle section of a lever (4) is connected to the fixed shaft (21), the lever (4) is arranged to move along the length direction relative to the fixed shaft (21), and is arranged to swing around the fixed shaft (21), the lower end of the lever (4) is rotatably connected to the outer end of the wedge block (3), and the axis of rotation is parallel to the fixed shaft (21); A through hole (22) is radially opened on the side wall of the blanking tube (2) above the fixed shaft (21), and a baffle (5) is inserted into the through hole (22). The outer end of the baffle (5) is arranged at the upper end of the lever (4), and the outer end of the baffle (5) is movable relative to the length direction of the lever (4). The distance between the bottom surface of the baffle (5) and the top surface of the wedge block (3) is consistent with the height of the plastic fat raw material.

2. A semiconductor lead frame packaging raw material feeding system according to claim 1, characterized in that: A vibration motor is provided on the hopper (1).

3. The semiconductor lead frame packaging raw material feeding system according to claim 1, characterized in that: The rear end of the baffle (5) is provided with a connecting shaft (51), which is parallel to the fixed shaft (21). The lever (4) is provided with strip holes (41) corresponding to the connecting shaft (51) and the fixed shaft (21). The connecting shaft (51) and the fixed shaft (21) are slidably arranged in the corresponding strip holes (41).

4. A semiconductor lead frame packaging raw material feeding system according to claim 1, characterized in that: A guide rod (23) is radially provided on the outside of the blanking tube (2), the guide rod (23) passes through the wedge block (3), a return spring (6) is sleeved on the guide rod (23), and is located between the end of the guide rod (23) and the wedge block (3), and the return spring (6) is in a compressed state.

5. The semiconductor lead frame packaging raw material feeding system according to claim 1, characterized in that: At least three groups of wedge blocks (3), levers (4), fixed shafts (21) and baffles (5) are arranged in a circumferential array along the blanking tube (2).

6. The semiconductor lead frame packaging raw material feeding system according to claim 1, characterized in that: The drop tubes (2) are all installed on the same frame (7), and a telescopic device (8) is provided at the bottom of the hopper (1) for controlling the lifting of the frame (7).

7. The semiconductor lead frame packaging raw material feeding system according to claim 1, characterized in that: When the drop tube (2) rises to the highest position, its top protrudes upward from the bottom surface inside the hopper (1).

8. The semiconductor lead frame packaging raw material feeding system according to claim 1, characterized in that: The outer diameter of the blanking tube (2) is larger than the outer diameter of the sleeve.

9. The semiconductor lead frame packaging raw material feeding system according to claim 1, characterized in that: The hopper (1) is spaced apart above a workbench (9), and a pair of parallel rails (91) are provided on the workbench for placing a transfer frame.

10. The semiconductor lead frame packaging raw material feeding system according to claim 1, characterized in that: At least three plastic fat raw materials can be stored inside the blanking tube (2) at the same time.

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