A small-particle QFN irregular frame packaging process

Abstract

This invention provides a small-chip QFN irregular frame packaging process, belonging to the field of QFN packaging technology, including the following steps: S1: Install individual chips onto frame units and connect the chips to the pins within the frame unit using wire bonding; S2: Install an arc-shaped molding die on the entire irregular frame; S3: Install the irregular frame and the arc-shaped molding die into an injection molding device for injection molding; S4: After cooling, cut according to the chip position. This invention, by setting an arc-shaped molding die, can form a molding body that is thicker in the middle and thinner at the edges on the irregular frame after injection molding. When the molding compound solidifies, due to the shrinkage of the edges of the irregular frame, while the thickness of the molding compound in the center of the frame is relatively large, the tensile stress at the edges and the supporting force in the middle cancel each other out. This makes the stress on the entire irregular frame uniform, greatly reducing the probability of warping and the chip damage rate, resulting in greater economy and practicality.

Description

Technical Field

[0001] This invention relates to the field of QFN packaging technology, and in particular to a small-particle QFN irregular frame packaging process. Background Technology

[0002] The chip industry chain can be divided into three major areas: circuit design, wafer manufacturing, and chip packaging and testing. As end-user electronic products continue to evolve towards thinner, lighter, and smarter designs, this presents both challenges and opportunities for IC chip packaging. The demand for QFN packaging, with its excellent electrothermal performance and small, lightweight design, is rapidly growing, gradually replacing other traditional packaging forms.

[0003] In existing QFNs, the thickness of the injection molded frame is generally uniform during injection molding. When the injection molded plastic shrinks during cooling and solidification, the edges of the entire frame are subjected to tensile stress, which causes the edges to bend towards the middle. This bending can easily damage the chip, resulting in poor economic efficiency. Summary of the Invention

[0004] This invention provides a small-particle QFN irregular frame packaging process to solve the problems mentioned in the background art.

[0005] To address the aforementioned technical problems, this invention discloses a small-particle QFN irregular frame packaging process, comprising the following steps:

[0006] S1: Install individual chips onto the frame unit and connect the chip to the pins within the frame unit using bonding wires;

[0007] S2: Install an arc-shaped plastic sealing mold on the entire irregular frame;

[0008] S3: Install the irregular frame and arc-shaped molding die into the injection molding device for injection molding;

[0009] S4: After cooling, cut the chip according to its position.

[0010] Preferably, in step S3, the injection molding device includes a housing, a support rod is fixedly installed on the lower inner wall of the housing, a ball is fixedly installed on the support rod, a vibrating plate is installed on the ball, a plurality of springs are arranged in a ring on the lower surface of the vibrating plate, the springs are fixedly connected to the lower surface of the housing, a limit mechanism is provided on the vibrating plate, an installation block is detachably installed on the vibrating plate, the limit mechanism is used to limit the installation block, and a special-shaped frame and an arc-shaped molding die are installed on the installation block.

[0011] Preferably, a drive motor is provided on the upper side of the housing, a hollow cylinder is fixedly and through the housing, a drive motor is fixedly provided on the hollow cylinder, a rotating rod is fixedly provided on the lower output end of the drive motor, a conveying blade is provided on the rotating rod, a rotating cylinder is rotatably connected to the lower side of the hollow cylinder, a connecting rod is fixedly provided at the lower end of the rotating rod, the connecting rod is fixedly connected to the rotating cylinder, a conveying cylinder is rotatably connected to the lower side of the rotating cylinder, and the conveying cylinder is detachably connected to the arc-shaped plastic sealing mold.

[0012] Preferably, a fixed plate is fixedly mounted on the rotating cylinder, and an mounting cylinder is fixedly mounted on the fixed plate. A rotating shaft is installed inside the mounting cylinder, and the rotating shaft rotates upward and passes through the fixed plate. A gear is fixedly mounted on the upper end of the rotating shaft, and a reciprocating screw is installed on the rotating shaft. A moving block is threadedly connected to the reciprocating screw, and the moving block is slidably connected to the inner wall of the mounting cylinder. A drive cylinder is fixedly mounted on the lower end of the moving block, and the reciprocating screw extends into the drive cylinder. A traveling mechanism is installed on the lower end of the drive cylinder.

[0013] Preferably, the walking mechanism includes a horizontal plate, which is fixedly installed at the lower end of the drive cylinder. Vertical plates are symmetrically arranged at the lower end of the horizontal plate. A walking rod is rotatably arranged on the side of the vertical plates that are close to each other. A walking wheel is fixedly installed on the walking rod and cooperates with the vibrating plate. A telescopic rod is also provided on the horizontal plate, and a fixed plate is fixedly connected to the upper end of the telescopic rod.

[0014] Preferably, a number of vertical rods are fixedly provided on the lower surface of the housing, and the same toothed ring is fixedly provided at the lower end of the vertical rods, and a gear is meshed with the toothed ring.

[0015] Preferably, an L-shaped plate is fixedly mounted on the horizontal plate, and a lifting rod is slidably mounted through the L-shaped plate. A lifting block is fixed to the upper end of the lifting rod, and a return spring is fixedly mounted to the lower end of the lifting block. The return spring is sleeved on the lifting rod, and the other end of the return spring is fixedly connected to the L-shaped plate. A stabilizing plate is fixedly mounted to the lower end of the lifting rod, and the stabilizing plate is slidably mounted on a vertical plate away from the mounting block. A striking rod is fixedly mounted to the lower end of the stabilizing plate. A traveling rod rotates through the vertical plate away from the mounting block, and a cam is fixedly mounted on the traveling rod to drive the stabilizing plate to move.

[0016] Preferably, the limiting mechanism includes several grooves and annular grooves, the grooves and annular grooves are interconnected, and L-shaped clamping blocks are slidably arranged in each groove. The L-shaped clamping blocks are used to clamp the mounting blocks, and extension rods are fixedly arranged on the horizontal sections of each L-shaped clamping block.

[0017] Preferably, an annular plate is slidably arranged in the annular groove, and several inclined grooves are provided on the annular plate. An extension rod extends into the inclined groove and cooperates with the inclined groove. Arc-shaped toothed plates are symmetrically arranged on the annular plate. A driving component is symmetrically installed on the lower surface of the vibrating plate. The output end of the driving component is fixedly connected to a driving rod. The driving rod extends upward and rotates through the vibrating plate. A second gear is fixedly arranged at the upper end of the driving rod. The second gear meshes with the arc-shaped toothed plate.

[0018] Preferably, the arc-shaped molding die includes a high-temperature resistant hose and an arc-shaped cavity, the arc-shaped cavity is detachably connected to the irregular frame, the upper surface of the mounting block is provided with a groove, the irregular frame and the arc-shaped cavity are installed in the groove, and the high-temperature resistant hose and the conveying cylinder are detachably connected.

[0019] Compared with existing technologies, this invention provides a small-particle QFN irregular frame packaging process with the following advantages: by setting an arc-shaped molding die, a molding body with a thick middle and thin edges can be formed on the irregular frame after injection molding. When the molding compound solidifies, the edges of the irregular frame shrink, while the thickness of the molding compound in the center of the frame is relatively large. At this time, the tensile stress at the edges and the supporting force in the middle cancel each other out, which can make the stress on the entire irregular frame uniform, greatly reducing the probability of warping and the chip damage rate, and making it more economical and practical. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0021] In the attached diagram:

[0022] Figure 1 This is a schematic diagram of the process of the present invention;

[0023] Figure 2 This is a schematic diagram of the irregular frame structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the injection molding device of the present invention;

[0025] Figure 4 This is a schematic diagram of the internal structure of the hollow cylinder of the present invention;

[0026] Figure 5 This is a schematic diagram of the internal structure of the mounting cylinder of the present invention;

[0027] Figure 6 For the present invention Figure 4 Enlarged view of point A;

[0028] Figure 7 For the present invention Figure 6 Side view;

[0029] Figure 8 This is a schematic diagram showing the connection between the annular groove and the recess in this invention;

[0030] Figure 9 This is a top view of the vibrating disc of the present invention;

[0031] Figure 10 This is a schematic diagram of the arc-shaped molding die of the present invention;

[0032] Figure 11 For the present invention Figure 10 Top view.

[0033] In the diagram: 1. Irregular frame; 2. Pin; 3. Bonding wire; 4. Frame unit; 5. Chip; 6. Drive motor; 7. Housing; 8. Mounting cylinder; 9. Gear 1; 10. Hollow cylinder; 11. Feed pipe; 12. Vertical rod; 13. Gear ring; 14. Arc-shaped molding die; 15. Mounting block; 16. Spring; 17. Vibrating plate; 18. Support rod; 19. Sphere; 20. Drive component; 21. L-shaped clamping block; 22. Rotating rod; 23. Conveying blade; 24. Fixing plate; 25. Rotating cylinder; 26. Conveying cylinder 27. Arc-shaped cavity; 28. Telescopic rod; 29. ​​Rotating shaft; 30. Reciprocating screw; 31. Drive cylinder; 32. Moving block; 33. Vertical plate; 34. Traveling rod; 35. Traveling wheel; 36. Striking rod; 37. Cam; 38. Stabilizing plate; 39. Lifting rod; 40. L-shaped plate; 41. Return spring; 42. Lifting block; 43. Annular groove; 44. Groove; 45. Extending rod; 46. High-temperature resistant hose; 47. Gear II; 48. Arc-shaped toothed plate; 49. Annular plate; 50. Inclined groove; 51. Horizontal plate. Detailed Implementation

[0034] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0035] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0036] Example 1

[0037] Embodiments of the present invention provide a small-particle QFN irregular frame packaging process, such as... Figures 1-11 As shown, it includes the following steps:

[0038] S1: Install individual chips 5 onto frame unit 4, and connect chip 5 to pin 2 in frame unit 4 using bonding wire 3;

[0039] S2: Install the arc-shaped plastic sealing mold 14 on the entire irregular frame 1;

[0040] S3: Install the irregular frame 1 and the arc-shaped molding die 14 into the injection molding device for injection molding;

[0041] S4: After cooling, cut according to the position of chip 5.

[0042] The working principle and beneficial effects of the above technical solution are as follows: Several individual chips 5 are respectively installed on the frame unit 4, and the chip 5 is connected to the pin 2 in the frame unit 4 by bonding wire 3; an arc-shaped molding die 14 is installed on the entire irregular frame 1; the irregular frame 1 and the arc-shaped molding die 14 are installed in the injection molding device for injection molding; after cooling, the irregular frame 1 is cut according to the position of the chip 5; by setting the arc-shaped molding die 14, a molding body with a thick middle and thin sides can be formed on the irregular frame 1 after injection molding. When the molding material solidifies, due to the shrinkage of the edges of the irregular frame 1, and the relatively large thickness of the molding material in the center of the frame, the tensile stress at the edges and the supporting force in the middle are offset, which can make the stress on the entire irregular frame 1 uniform, greatly reducing the probability of warping and the chip damage rate, making it more economical and practical.

[0043] Example 2

[0044] Based on the above embodiment 1, as follows Figures 3-4 As shown, in step S3, the injection molding device includes a housing 7. A support rod 18 is fixedly installed on the lower inner wall of the housing 7. A ball 19 is fixedly installed on the support rod 18. A vibrating plate 17 is installed on the ball 19. Several springs 16 are arranged in a ring on the lower surface of the vibrating plate 17. The springs 16 are fixedly connected to the lower surface of the housing 7. A limiting mechanism is provided on the vibrating plate 17. An installation block 15 is detachably installed on the vibrating plate 17. The limiting mechanism is used to limit the installation block 15. An irregular frame 1 and an arc-shaped molding die 14 are installed on the installation block 15.

[0045] Preferably, a drive motor 6 is provided on the upper side of the housing 7, a hollow cylinder 10 is fixedly and through the housing 7, a feed pipe 11 is provided through the hollow cylinder 10, a drive motor 6 is fixedly provided on the hollow cylinder 10, a rotating rod 22 is fixedly provided at the lower output end of the drive motor 6, a conveying blade 23 is provided on the rotating rod 22, a rotating cylinder 25 is rotatably connected to the lower side of the hollow cylinder 10, a connecting rod is fixedly provided at the lower end of the rotating rod 22, the connecting rod is fixedly connected to the rotating cylinder 25, a conveying cylinder 26 is rotatably connected to the lower side of the rotating cylinder 25, and the conveying cylinder 26 is detachably connected to the arc-shaped sealing mold 14.

[0046] The working principle and beneficial effects of the above technical solution are as follows: First, the irregular frame 1 and the arc-shaped molding die 14 are installed on the mounting block 15. Then, the mounting block 15 is installed on the vibrating plate 17. The limiting mechanism is activated to limit the mounting block 15. Then, the material is fed through the feed pipe 11. The drive motor 6 is started. The drive motor 6 drives the rotating rod 22 to rotate. The rotating rod 22 drives the conveying blade 23. The molding material enters the arc-shaped molding die 14 after passing through the hollow cylinder 10, the rotating cylinder 25 and the conveying cylinder 26, thereby molding the irregular frame 1. The molding process involves sealing the material. By setting a limiting mechanism, the mounting block 15 can be limited, thereby limiting the irregular frame 1 and the arc-shaped molding mold 14. The detachable connection between the conveying cylinder 26 and the arc-shaped molding mold 14, along with the limiting mechanism for the mounting block 15, allows for quick loading and unloading of the mounting block 15. The arc-shaped molding mold 14 can also be loaded and unloaded quickly, enhancing convenience. The conveying blades 23 ensure that the molding material can be evenly fed into the arc-shaped molding mold 14, resulting in more stable delivery.

[0047] Example 3

[0048] Based on the above embodiment 2, as Figures 3-6 As shown, a fixed plate 24 is fixedly installed on the rotating cylinder 25, and an installation cylinder 8 is fixedly installed on the fixed plate 24. A rotating shaft 29 is installed inside the installation cylinder 8. The rotating shaft 29 rotates upward and passes through the fixed plate 24. A gear 9 is fixedly installed at the upper end of the rotating shaft 29. A reciprocating screw 30 is installed on the rotating shaft 29. A moving block 32 is threadedly connected to the reciprocating screw 30. The moving block 32 is slidably connected to the inner wall of the installation cylinder 8. A drive cylinder 31 is fixedly installed at the lower end of the moving block 32. The reciprocating screw 30 extends into the drive cylinder 31. A traveling mechanism is installed at the lower end of the drive cylinder 31.

[0049] Preferably, the walking mechanism includes a horizontal plate 51, which is fixedly installed at the lower end of the drive cylinder 31. Vertical plates 33 are symmetrically arranged at the lower end of the horizontal plate 51. A walking rod 34 is rotatably arranged on the side of the vertical plates 33 that are close to each other. A walking wheel 35 is fixedly installed on the walking rod 34 and cooperates with the vibrating plate 17. A telescopic rod 28 is also provided on the horizontal plate 51, and a fixed plate 24 is fixedly connected to the upper end of the telescopic rod 28.

[0050] Preferably, a plurality of vertical rods 12 are fixedly provided on the lower surface of the housing 7, and the same toothed ring 13 is fixedly provided at the lower end of the vertical rods 12, and the gear 9 meshes with the toothed ring 13.

[0051] The working principle and beneficial effects of the above technical solution are as follows: When the rotating rod 22 rotates, the rotating rod 22 drives the rotating cylinder 25 to rotate, the rotating cylinder 25 drives the fixed plate 24 to revolve around the center of the hollow cylinder 10, the fixed plate 24 drives the mounting cylinder 8 to revolve, the mounting cylinder 8 drives the rotating shaft 29 to revolve, the gear 9 on the rotating shaft 29 will rotate under the meshing action of the gear ring 13, the gear 9 drives the rotating shaft 29 to rotate, the rotating shaft 29 drives the reciprocating screw 30 to rotate, the reciprocating screw 30 drives the moving block 32 to move up and down, the moving block 32 drives the driving cylinder 31 to move up and down, the driving cylinder 31 drives the horizontal plate 51 to move up and down, the horizontal plate 51... 1. The two vertical plates 33 move up and down, causing the traveling wheel 35 to contact the vibrating plate 17 (initially, the traveling wheel 35 and the vibrating plate 17 are not in contact), and pressing the vibrating plate 17, causing one side of the vibrating plate 17 to move downward. When the vertical plate 33 moves upward, that is, when the traveling wheel 35 and the vibrating plate 17 are no longer in contact, the vibrating plate 17 returns to its original shape under the action of several springs 16, thereby vibrating the encapsulating liquid in the arc-shaped encapsulation mold 14. This effectively removes any air bubbles that may exist in the encapsulating material when injection molding inside the arc-shaped encapsulation mold 14, resulting in a better encapsulation effect and greater practicality.

[0052] Example 4

[0053] Based on the above embodiment 3, such as Figures 3-7 As shown, an L-shaped plate 40 is fixedly installed on the horizontal plate 51. A lifting rod 39 is slidably installed through the L-shaped plate 40. A lifting block 42 is fixed to the upper end of the lifting rod 39. A return spring 41 is fixed to the lower end of the lifting block 42. The return spring 41 is sleeved on the lifting rod 39. The other end of the return spring 41 is fixedly connected to the L-shaped plate 40. A stabilizing plate 38 is fixedly installed at the lower end of the lifting rod 39. The stabilizing plate 38 is slidably installed on the vertical plate 33 away from the mounting block 15. A striking rod 36 is fixedly installed at the lower end of the stabilizing plate 38. A traveling rod 34 rotates through the vertical plate 33 away from the mounting block 15. A cam 37 is fixedly installed on the traveling rod 34. The cam 37 is used to drive the stabilizing plate 38 to move.

[0054] The walking wheel 35 is equipped with a friction pad, and the vibrating plate 17 is equipped with an annular friction plate to increase the friction between the walking wheel 35 and the vibrating plate 17.

[0055] The working principle and beneficial effects of the above technical solution are as follows: When the traveling wheel 35 contacts the vibrating plate 17, the traveling wheel 35 will start to rotate under the action of friction. The traveling wheel 35 drives the traveling rod 34 to rotate, the traveling rod 34 drives the cam 37 to rotate, the cam 37 drives the stabilizing plate 38 to move upward, the stabilizing plate 38 drives the striking rod 36 and the lifting rod 39 to rise. When the cam 37 continues to rotate and the cam 37 is no longer in contact with the stabilizing plate 38, under the action of the return spring 41, the lifting block 42 descends rapidly. The lifting block 42 drives the lifting rod 39, the stabilizing plate 38 and the striking rod. The rapid descent of the 36 striking rod causes it to strike the vibratory plate 17, which in turn vibrates the vibratory plate 17. The vibratory plate 17 then vibrates the mounting block 15, which in turn causes the curved molding die 14 to vibrate. This allows the molding liquid injected into the curved molding die 14 to escape as much as possible, further removing air bubbles from the molding material and resulting in better molding and improved practicality. Moreover, the conveying of the molding material, the deflection of the vibratory plate 17, and the vibration of the vibratory plate 17 can all be achieved through the action of a single drive motor 6, making the entire device more coordinated and practical.

[0056] Example 5

[0057] Based on the above embodiments 1-4, such as Figure 3 , Figures 8-9 As shown, the limiting mechanism includes several grooves 44 and annular grooves 43. The grooves 44 and annular grooves 43 are interconnected. An L-shaped clamping block 21 is slidably arranged in each groove 44. The L-shaped clamping block 21 is used to clamp the mounting block 15. An extension rod 45 is fixedly arranged on the horizontal section of each L-shaped clamping block 21.

[0058] Preferably, an annular plate 49 is slidably disposed in the annular groove 43, and a plurality of inclined grooves 50 are disposed on the annular plate 49. An extension rod 45 extends into the inclined groove 50 and cooperates with the inclined groove 50. Arc-shaped toothed plates 48 are symmetrically disposed on the annular plate 49. A drive member 20 is symmetrically installed on the lower surface of the vibrating plate 17. The output end of the drive member 20 is fixedly connected to a drive rod. The drive rod extends upward and rotates through the vibrating plate 17. A gear 47 is fixedly disposed at the upper end of the drive rod and meshes with the arc-shaped toothed plate 48.

[0059] The working principle and beneficial effects of the above technical solution are as follows: When the mounting block 15 is installed into the housing 7, the drive component 20 is activated. The drive component 20 drives the drive rod to rotate, the drive rod drives the gear 47 to rotate, the gear 47 drives the arc-shaped toothed plate 48 to rotate, the arc-shaped toothed plate 48 drives the annular plate 49 to rotate, and the rotation of the annular plate 49 causes the extension rod 45 to slide in the inclined groove 50. The extension rod 45 moves to the side closer to the mounting block 15, and the extension rod 45 drives the L-shaped clamping block 21 to move, so that several L-shaped clamping blocks 21 clamp the mounting block 15, thereby completing the limiting operation of the mounting block 15. Through the rising structure, the mounting block 15 can be clamped quickly, making it more convenient to use and the clamping and limiting more stable.

[0060] Example 6

[0061] Based on the above embodiments 1-5, such as Figure 3 , Figures 10-11 As shown, the arc-shaped molding die 14 includes a high-temperature resistant hose 46 and an arc-shaped cavity 27. The arc-shaped cavity 27 is detachably connected to the irregular frame 1. The upper surface of the mounting block 15 is provided with a groove, and the irregular frame 1 and the arc-shaped cavity 27 are installed in the groove. The high-temperature resistant hose 46 and the conveying cylinder 26 are detachably connected.

[0062] The beneficial effects of the above technical solution are as follows: by opening a groove on the upper surface of the mounting block 15, the irregular frame 1 and the arc-shaped cavity 27 can be quickly installed; the detachable connection between the arc-shaped cavity 27 and the irregular frame 1 can be set as a snap-fit; the connection between the arc-shaped cavity 27 and the groove can also be set as a snap-fit, making the connection more convenient and stable; and by detachably connecting the high-temperature resistant hose 46 to the conveying cylinder 26, the connection of the arc-shaped molding mold 14 can be quickly completed, and the setting of the high-temperature resistant hose 46 can ensure that the conveying of the molding material is not affected when the vibrating plate 17 deflects and vibrates, and the setting of the arc-shaped cavity 27 can form an arc-shaped molding body on the irregular frame 1, effectively balancing stress and making it more practical.

[0063] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. If these modifications and variations fall within the scope of the claims of this invention and their equivalents, then this invention is also intended to include these modifications and variations.

Claims

1. A small-particle QFN irregular frame packaging process, characterized in that, Includes the following steps: S1: Install individual chips (5) onto frame units (4) respectively, and connect the chip (5) to the pins (2) in the frame unit (4) using bonding wires (3); S2: Install the arc-shaped molding die (14) on the entire irregular frame (1); S3: Install the irregular frame (1) and the arc-shaped molding die (14) into the injection molding device for injection molding; S4: After cooling, cut according to the position of chip (5); In step S3, the injection molding device includes a housing (7), a support rod (18) is fixedly installed on the lower inner wall of the housing (7), a ball (19) is fixedly installed on the support rod (18), a vibrating plate (17) is installed on the ball (19), a number of springs (16) are arranged in a ring on the lower surface of the vibrating plate (17), the springs (16) are fixedly connected to the lower surface of the housing (7), a limit mechanism is provided on the vibrating plate (17), and an installation block (15) is detachably installed on the vibrating plate (17). The limit mechanism is used to limit the installation block (15), and a special frame (1) and an arc-shaped molding die (14) are installed on the installation block (15). A drive motor (6) is provided on the upper side of the housing (7). A hollow cylinder (10) is fixedly provided through the housing (7). A feed pipe (11) is provided through the hollow cylinder (10). A drive motor (6) is fixedly provided on the hollow cylinder (10). A rotating rod (22) is fixedly provided at the lower output end of the drive motor (6). A conveying blade (23) is provided on the rotating rod (22). A rotating cylinder (25) is rotatably connected to the lower side of the hollow cylinder (10). A connecting rod is fixedly provided at the lower end of the rotating rod (22). The connecting rod is fixedly connected to the rotating cylinder (25). A conveying cylinder (26) is rotatably connected to the lower side of the rotating cylinder (25). The conveying cylinder (26) is detachably connected to the arc-shaped plastic sealing mold (14). A fixed plate (24) is fixedly installed on the rotating cylinder (25), and an installation cylinder (8) is fixedly installed on the fixed plate (24). A rotating shaft (29) is installed inside the installation cylinder (8). The rotating shaft (29) rotates upward and passes through the fixed plate (24). A gear (9) is fixedly installed at the upper end of the rotating shaft (29). A reciprocating screw (30) is installed on the rotating shaft (29). A moving block (32) is threadedly connected to the reciprocating screw (30). The moving block (32) is slidably connected to the inner wall of the installation cylinder (8). A drive cylinder (31) is fixedly installed at the lower end of the moving block (32). The reciprocating screw (30) extends into the drive cylinder (31). A traveling mechanism is installed at the lower end of the drive cylinder (31).

2. The small-particle QFN irregular frame packaging process according to claim 1, characterized in that, The walking mechanism includes a horizontal plate (51), which is fixedly installed at the lower end of the drive cylinder (31). Vertical plates (33) are symmetrically arranged at the lower end of the horizontal plate (51). A walking rod (34) is rotatably arranged on the side of the vertical plates (33) that are close to each other. A walking wheel (35) is fixedly installed on the walking rod (34). The walking wheel (35) cooperates with the vibrating plate (17). A telescopic rod (28) is also provided on the horizontal plate (51). A fixed plate (24) is fixedly connected to the upper end of the telescopic rod (28).

3. The small-particle QFN irregular frame packaging process according to claim 1, characterized in that, Several vertical rods (12) are fixedly provided on the lower surface of the housing (7). The same toothed ring (13) is fixedly provided at the lower end of the vertical rods (12). Gear 1 (9) meshes with the toothed ring (13).

4. The small-particle QFN irregular frame packaging process according to claim 2, characterized in that, An L-shaped plate (40) is fixedly installed on the horizontal plate (51). A lifting rod (39) is slidably installed through the L-shaped plate (40). A lifting block (42) is fixed at the upper end of the lifting rod (39). A return spring (41) is fixed at the lower end of the lifting block (42). The return spring (41) is sleeved on the lifting rod (39). The other end of the return spring (41) is fixedly connected to the L-shaped plate (40). A stabilizing plate (38) is fixedly installed at the lower end of the lifting rod (39). The stabilizing plate (38) is slidably installed on the vertical plate (33) away from the mounting block (15). A striking rod (36) is fixedly installed at the lower end of the stabilizing plate (38). A traveling rod (34) rotates through the vertical plate (33) away from the mounting block (15). A cam (37) is fixedly installed on the traveling rod (34). The cam (37) is used to drive the stabilizing plate (38) to move.

5. The small-particle QFN irregular frame packaging process according to claim 1, characterized in that, The limiting mechanism includes several grooves (44) and annular grooves (43). The grooves (44) and annular grooves (43) are connected. An L-shaped clamping block (21) is slidably arranged in each groove (44). The L-shaped clamping block (21) is used to clamp the mounting block (15). An extension rod (45) is fixedly arranged on the horizontal section of the L-shaped clamping block (21).

6. The small-particle QFN irregular frame packaging process according to claim 5, characterized in that, An annular plate (49) is slidably arranged in the annular groove (43). Several inclined grooves (50) are provided on the annular plate (49). An extension rod (45) extends into the inclined groove (50) and cooperates with the inclined groove (50). An arc-shaped toothed plate (48) is symmetrically arranged on the annular plate (49). A drive component (20) is symmetrically installed on the lower surface of the vibrating plate (17). The output end of the drive component (20) is fixedly connected to the drive rod. The drive rod extends upward and rotates through the vibrating plate (17). A gear two (47) is fixedly arranged at the upper end of the drive rod. The gear two (47) meshes with the arc-shaped toothed plate (48).

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