A raw material screening device for epoxy molding compound production

Abstract

This invention relates to the field of epoxy molding compound production technology, and more particularly to a raw material screening device for epoxy molding compound production. The device includes a gantry frame, with a feeding trough at the top and a conveyor belt at the bottom. A vibrating screening box is located below the discharge port of the feeding trough on top of the conveyor belt. The device also includes a vibration mechanism located at the top of the vibrating screening box. This invention allows for the controllable vertical lifting and lowering of filter plates two via adjustable components, precisely adjusting the material flow channel spacing between filter plates one and two. This adapts to both dry and slightly damp powders. For dry powders, the channel spacing can be increased to improve screening efficiency; for slightly damp powders, the channel spacing can be decreased to reduce powder adhesion and accumulation. This effectively overcomes the poor adaptability of traditional screening equipment, significantly improving the equipment's versatility and overall screening efficiency.

Description

Technical Field

[0001] This invention relates to the field of epoxy molding compound production technology, and in particular to a raw material screening device for epoxy molding compound production. Background Technology

[0002] Epoxy molding compound is a powder composite material made by mixing epoxy resin as the matrix with curing agents, inorganic fillers, and additives. It is widely used in semiconductor components and integrated circuit packaging. Epoxy molding compound raw material powder is prone to agglomeration and clumping of particles. Depending on the storage environment, the raw material is divided into dry powder and damp powder. If directly added to the mixing process, large powder lumps will cause uneven distribution of fillers in the product, affecting the molding quality and insulation performance of the packaged product. Therefore, the raw material powder needs to be screened and impurities removed before production.

[0003] Existing equipment struggles to handle both dry and slightly damp powder conditions simultaneously. Dry powders have good flowability, requiring a larger passage space for screening, while damp powders are highly viscous, prone to agglomeration and adhesion to screen holes. Excessive passage space can lead to a large accumulation of lumpy material, while insufficient passage space reduces the processing efficiency of dry powders. Conventional screen structures cannot flexibly adapt to the two material states.

[0004] Therefore, how to provide a raw material screening device for epoxy molding compound production is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a raw material screening device for epoxy molding compound production, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a raw material screening device for epoxy molding compound production, comprising a gantry frame, a feeding trough being provided at the top of the gantry frame, a conveyor belt being provided at the bottom of the gantry frame, and a vibrating screening box being provided at the top of the conveyor belt below the discharge port of the feeding trough, and further comprising: The vibration mechanism is located at the top of the vibrating screening box. When the vibration mechanism is working, it drives the vibrating screening box to screen the powder falling from the feed chute. The guide trough frame and filter plate one are fixedly installed on the top of the conveyor belt and the filter plate one is fixedly installed inside the vibrating screening box to perform preliminary screening of the powder falling from the feed trough. Filter plate two is located inside the vibrating screening box and below filter plate one. The bottom of filter plate two is driven to move by an adjustment mechanism. A channel is provided between the bottom of filter plate one and the top of filter plate two, and an anti-clogging mechanism is installed in the channel.

[0007] Furthermore, it also includes a striking frame, which is fixedly connected to the bottom of the second filter plate. A rotating block is rotatably connected to the inner side of the striking frame, and a striking head is fixedly connected to the bottom of the rotating block.

[0008] Furthermore, a powder collection shell is detachably provided on the left side of the vibrating screening box, and a filter groove is provided at the bottom of the powder collection shell. The bottom of the vibrating screening box is connected to the top of the guide trough frame.

[0009] Furthermore, the adjustment mechanism includes a support base and an adjustment component. The bottom of the support base is fixedly connected to the inner walls of both sides of the guide channel frame, the adjustment component is disposed on the top of the support base, and the bottom of the second filter plate is connected to the support base through the adjustment component.

[0010] Furthermore, the anti-clogging mechanism includes an elastic ring, both the first filter plate and the second filter plate are provided with through filter holes, and the diameter of the filter holes on the second filter plate is smaller than the diameter of the filter holes on the first filter plate. The elastic ring is located on the top of the second filter plate and is located outside the filter holes.

[0011] Furthermore, the anti-clogging mechanism includes a rhomboid elastic collar, which is disposed on the outside of the filter holes at the top of the second filter plate. A movable plate is fixedly connected to the left side of the rhomboid elastic collar, and a movable block is fixedly connected to the bottom of the movable plate. A fixed frame is fixedly connected to the bottom of the second filter plate, and an electric telescopic rod is fixedly connected to the inner side of the fixed frame. The telescopic end of the electric telescopic rod is connected to the movable block. When the electric telescopic rod is working, it controls the movement of the movable block and the movable plate, and drives the rhomboid elastic collar to deform during the movement.

[0012] Furthermore, the vibration mechanism includes a drive motor, which is located on the top of the vibrating screening box. The output shaft of the drive motor is connected to a pulley one, and a belt is driven on the outer side of the pulley one. A pulley two is driven on the other end of the pulley one via the belt. A rotating shaft is provided in the middle of the pulley two, passing through the front and rear sides of the vibrating screening box. Eccentric wheels are provided at the front and rear ends of the rotating shaft on the outer side of the vibrating screening box.

[0013] Furthermore, it also includes a support mechanism, which consists of a support platform, a damping connecting rod, and a support member. The support platform is located on top of the conveyor belt, the top of the support platform is provided with a damping connecting rod, the top of the damping connecting rod is connected to a support member, and the support member is connected to the outer wall of the vibrating screening box.

[0014] Furthermore, it also includes a support mechanism, which consists of a support base, a damping connecting rod, and a support member; Furthermore, it also includes a screening mechanism, which consists of a powder collection shell, a flow guide frame, a first filter plate, a support base, an adjusting component, a second filter plate, and an elastic ring; Furthermore, it also includes a striking mechanism, which consists of a striking frame, a rotating block, and a striking head; Furthermore, it also includes a protective mechanism, which consists of a diamond-shaped elastic collar, a movable plate, a movable block, a fixed frame, and an electric telescopic rod.

[0015] The beneficial effects of this invention are: 1. This invention uses an adjustable component to controllably drive the vertical lifting of filter plate two, precisely adjusting the material flow channel spacing between filter plate one and filter plate two. It can adapt to two different working conditions: dry powder and slightly moist powder. For dry powder, the channel spacing can be increased to improve screening efficiency, while for slightly moist powder, the channel spacing can be reduced to reduce powder adhesion and accumulation. This effectively overcomes the defect of poor adaptability of traditional screening equipment and significantly improves the equipment's versatility and overall screening efficiency. 2. In this invention, the passive anti-clogging structure relies on the reciprocating deformation of the elastic ring of the first filter plate by vibration and compression to disturb the internal powder and prevent bridging and clogging. At the same time, the intermittent knocking action of the knocking frame and knocking head on the second filter plate shakes off the adhering powder. The active anti-clogging structure drives the diamond elastic ring to actively deform through the electric telescopic rod, and can independently complete the unblocking of the screen holes without relying on vibration and compression, making the switching of working conditions more stable and reliable. 3. This invention adopts a double-layer screening structure (filter plate one and filter plate two), and the lower layer has a smaller pore size than the upper layer, realizing two-level classification. It is equipped with an independent powder block collection shell to specifically recycle the clump material retained in the upper layer. Its bottom filter tank design avoids the waste of qualified fine powder and improves the utilization rate of raw materials. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a raw material screening device for epoxy molding compound production proposed in this invention. Figure 2 This is a schematic diagram of the drive motor of a raw material screening device for epoxy molding compound production proposed in this invention. Figure 3 This is a schematic diagram of the exploded structure of the powder collection shell of a raw material screening device for epoxy molding compound production proposed in this invention; Figure 4 This is a schematic diagram of two pulley structures of a raw material screening device for epoxy molding compound production proposed in this invention; Figure 5 This is a schematic diagram of the exploded structure of the elastic ring of a raw material screening device for epoxy molding compound production proposed in this invention; Figure 6This is a schematic diagram of the striking frame structure of a raw material screening device for epoxy molding compound production proposed in this invention; Figure 7 This is an enlarged structural diagram of the striking head of a raw material screening device for epoxy molding compound production proposed in this invention. Figure 8 This is a schematic diagram of the moving block structure of a raw material screening device for epoxy molding compound production proposed in this invention; Figure 9 This is an enlarged structural diagram of the electric telescopic rod of a raw material screening device for epoxy molding compound production proposed in this invention.

[0017] In the diagram: 1. Gantry frame; 2. Feed chute; 3. Conveyor belt; 4. Vibrating screening box; 5. Vibration mechanism; 501. Drive motor; 502. Pulley 1; 503. Belt; 504. Pulley 2; 505. Rotating shaft; 6. Supporting structures; 601. Support platform; 602. Damping connecting rod; 603. Support component; 7. Screening agency; 701. Powder lumps collection shell; 702. Flow guide frame; 703. Filter plate one; 704. Support base; 705. Adjusting component; 706. Filter plate two; 707. Elastic ring; 8. Striking mechanism; 801. Striking frame; 802. Rotating block; 803. Striking head; 9. Protective equipment; 901. Diamond-shaped elastic collar; 902. Movable plate; 903. Movable block; 904. Fixed frame; 905. Electric telescopic rod. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0019] Most existing epoxy molding compound raw material screening equipment uses a single-layer screen for screening, which can only achieve simple particle separation and has the following drawbacks: First, existing equipment cannot accommodate both dry and slightly damp powder conditions. Dry powder has good flowability and requires a large passage space for screening, while damp powder is sticky and prone to agglomeration and adhesion to the screen holes. Excessive passage space can cause a large accumulation of lumpy material, while insufficient passage space will reduce the processing efficiency of dry powder. Conventional screen structures cannot flexibly adapt to the two material states.

[0020] Secondly, damp powder is very easy to adhere to the edge of the screen holes, forming bridging blockage. Conventional vibrating screens rely solely on the overall vibration of the box to clear the blockage, which has a limited effect. Continuous blockage will continuously reduce screening efficiency, requiring frequent shutdowns for manual cleaning, which affects the continuity of the production line. Furthermore, the relative positions of the upper and lower screen plates in traditional double-layer screening devices are fixed, and the powder channel between the two screen plates cannot be adjusted. The powder residence time cannot be adjusted according to the material moisture content. At the same time, there is a lack of targeted self-cleaning structure, resulting in poor screening stability. Finally, the violent disturbance of powder during the screening process can easily generate a large amount of dust. The outward diffusion of dust not only causes raw material loss, but also pollutes the workshop environment and endangers the health of operators.

[0021] The following is combined Figures 1-9 The following describes embodiments of the present invention.

[0022] According to the problem raised by the present invention, a possible embodiment is provided. In one aspect, a raw material screening device for epoxy molding compound production is provided, including a gantry frame 1, a feeding trough 2 disposed at the top of the gantry frame 1, a conveyor belt 3 disposed at the bottom of the gantry frame 1, and a vibrating screening box 4 disposed at the top of the conveyor belt 3 below the discharge port of the feeding trough 2. The device also includes: Vibration mechanism 5 is located on the top of vibrating screening box 4. When working, vibration mechanism 5 drives vibrating screening box 4 to screen the powder falling from feeding trough 2. The guide trough frame 702 and the filter plate 703 are fixedly installed on the top of the conveyor belt 3 and the filter plate 703 is fixedly installed inside the vibrating screening box 4 to perform preliminary screening of the powder falling from the feed trough 2. Filter plate 2 706 is located inside the vibrating screening box 4 and below filter plate 1 703. The bottom of filter plate 2 706 is driven to move by an adjustment mechanism. A channel is provided between the bottom of filter plate 1 703 and the top of filter plate 2 706, and an anti-clogging mechanism is installed in the channel.

[0023] In this embodiment, the distance between filter plate 2 706 and filter plate 1 703 is controlled by adjusting the mechanism to control the channel size between filter plate 2 706 and filter plate 1 703. At the same time, the anti-clogging mechanism is passively displaced to differentiate between the screened dry powder and slightly damp powder under different working conditions.

[0024] In one specific embodiment, it further includes a striking frame 801, which is fixedly connected to the bottom of the filter plate 706. A rotating block 802 is rotatably connected to the inner side of the striking frame 801, and a striking head 803 is fixedly connected to the bottom of the rotating block 802.

[0025] In this embodiment, the filter plate 706 and the elastic ring 707 are squeezed by the filter plate 703 and shake. At the same time, the striking head 803 and the rotating block 802 rotate inside the striking frame 801, and the striking head 803 intermittently strikes the bottom of the filter plate 706, loosening the dust attached to the filter plate 706 and the elastic ring 707 and helping the powder to fall off.

[0026] In one specific embodiment, a powder collection housing 701 is detachably provided on the left side of the vibrating screening box 4, and a filter groove is provided at the bottom of the powder collection housing 701. The bottom of the vibrating screening box 4 is connected to the top of the guide trough frame 702.

[0027] By setting up a powder collection housing 701, the plate-shaped powder filtered down from the top of the filter plate 703 is recovered. At the same time, a filter tank is set up to ensure that ordinary powder can fall out of the powder collection housing 701 in a timely manner. By setting up a detachable installation method, the powder collection housing 701 is easy to clean and maintain during use.

[0028] In one specific embodiment, the adjustment mechanism includes a support base 704 and an adjustment member 705. The bottom of the support base 704 is fixedly connected to the inner walls on both sides of the guide channel frame 702, and the adjustment member 705 is disposed on the top of the support base 704. The bottom of the filter plate 706 is connected to the support base 704 through the adjustment member 705.

[0029] In this embodiment, the adjusting member 705 can be an electric telescopic rod or an elastic connector. When it is set as an electric telescopic rod, it can actively drive the filter plate 706 to move up and down. When it is set as an elastic connector, it moves due to the elastic recovery after compression and the downward pressure of the filter plate 703. Those skilled in the art can foresee that any structure that can control the movement of the filter plate 706 and give it a certain reset function should fall within the protection scope of this invention.

[0030] In this embodiment, by controlling the position of the second filter plate 706, the gap between the elastic ring 707 and the bottom of the first filter plate 703 is controlled. When the gap is large, it provides work for dry powder, while when the gap is small, it provides work for slightly damp powder.

[0031] In one specific embodiment, the anti-clogging mechanism includes an elastic ring 707. Both filter plate one 703 and filter plate two 706 are provided with through filter holes, and the diameter of the filter hole on filter plate two 706 is smaller than the diameter of the filter hole on filter plate one 703. The elastic ring 707 is disposed on the top of filter plate two 706 and is located outside the filter hole.

[0032] By setting the elastic ring 707 and the difference in the size of the filter holes of filter plate 1 703 and filter plate 2 706, while filter plate 1 703 vibrates and moves, filter plate 1 703 contacts the top of the elastic ring 707 and causes it to deform partially. At the same time, the particle size of the powder passing through the lower filter hole of filter plate 2 706 is smaller than the particle size of the powder falling from the upper filter plate 1 703.

[0033] In one specific embodiment, the anti-clogging mechanism includes a rhomboid elastic collar 901, which is disposed on the outer side of the filter hole at the top of the filter plate 706. A movable plate 902 is fixedly connected to the left side of the rhomboid elastic collar 901, and a movable block 903 is fixedly connected to the bottom of the movable plate 902. A fixed frame 904 is fixedly connected to the bottom of the filter plate 706, and an electric telescopic rod 905 is fixedly connected to the inner side of the fixed frame 904. The telescopic end of the electric telescopic rod 905 is connected to the movable block 903. When working, the electric telescopic rod 905 controls the movement of the movable block 903 and the movable plate 902, and causes the rhomboid elastic collar 901 to deform during the movement.

[0034] In this embodiment, by eliminating the adjustment mechanism at the bottom and setting the filter plate 706 to a fixed position, and by controlling the electric telescopic rod 905 to adjust the shape of the rhomboid elastic collar 901 independently, unidirectional control deformation can be achieved without relying on the vibration and compression of the filter plate 703, making the device more stable in state switching during use.

[0035] In one specific embodiment, the vibration mechanism 5 includes a drive motor 501, which is located on the top of the vibrating screening box 4. The output shaft of the drive motor 501 is connected to a pulley 502. A belt 503 is driven on the outer side of the pulley 502. The other end of the pulley 502 is driven by the belt 503 to a pulley 504. A rotating shaft 505 is provided in the middle of the pulley 504, which passes through the front and rear sides of the vibrating screening box 4. Eccentric wheels are provided at the front and rear ends of the rotating shaft 505 on the outer side of the vibrating screening box 4.

[0036] It also includes a support mechanism 6, which consists of a support platform 601, a damping connecting rod 602 and a support member 603. The support platform 601 is located on the top of the conveyor belt 3. The damping connecting rod 602 is located on the top of the support platform 601. The support member 603 is connected to the top of the damping connecting rod 602. The support member 603 is connected to the outer wall of the vibrating screening box 4.

[0037] It also includes a support mechanism 6, which consists of a support platform 601, a damping connecting rod 602, and a support member 603; It also includes a screening mechanism 7, which consists of a powder collection housing 701, a flow guide frame 702, a first filter plate 703, a support base 704, an adjusting component 705, a second filter plate 706, and an elastic ring 707. It also includes a striking mechanism 8, which consists of a striking frame 801, a rotating block 802 and a striking head 803; It also includes a protective mechanism 9, which consists of a rhomboid elastic collar 901, a movable plate 902, a movable block 903, a fixed frame 904, and an electric telescopic rod 905; In this embodiment, a drive motor 501 is provided to provide kinetic energy for the vibration of the vibrating screening box 4, while the support mechanism 6 is provided to support the vibrating screening box 4 and absorb energy generated during shaking.

[0038] In another embodiment not shown, an air supply component is provided on the top of the vibrating screening box 4, and dust filter components are provided on the front and bottom of the back of the vibrating screening box 4. The air supply component sends outside air into the vibrating screening box 4, effectively suppressing the dust in the vibrating screening box 4 from escaping outward. At the same time, the air containing powder in the vibrating screening box 4 is filtered by the dust filter components to ensure the cleanliness of the workshop environment.

[0039] Working principle: The epoxy molding compound raw material powder falls downward from the feeding chute 2 at the top of the gantry frame 1 and enters the vibrating screening box 4. The vibration mechanism 5 runs and drives the vibrating screening box 4 to generate continuous vibration. The support mechanism 6 supports the vibrating screening box 4. At the same time, the damping connecting rod 602 absorbs the vibration energy and reduces the vibration transmitted to the conveyor belt 3. The powder first undergoes preliminary screening through the filter plate 703. The blocky powder with a particle size larger than the filter holes of the filter plate 703 is intercepted and collected in the powder block collection shell 701 that can be detached and installed on the left side of the vibrating screening box 4 for centralized recycling. The filter groove at the bottom of the powder block collection shell 701 allows the fine powder mixed in the agglomerated material to flow downward, avoiding the retention and accumulation of qualified powder. Powder that can pass through the filter holes of filter plate 703 enters the channel between filter plate 703 and filter plate 706. The filter hole diameter of filter plate 706 is smaller than that of filter plate 703, thereby realizing two-stage fine screening of powder. The adjusting component 705 of the adjusting mechanism can drive filter plate 706 to rise and fall, changing the channel spacing between filter plate 703 and filter plate 706. When the channel spacing is increased, it is suitable for screening dry powder; when the channel spacing is decreased, it is suitable for screening slightly moist powder. The device is equipped with two optional anti-clogging structures: one is a passive anti-clogging structure, in which an elastic ring 707 is set around the filter holes on the top surface of the filter plate 706. During vibration, the filter plate 703 periodically squeezes the elastic ring 707 to repeatedly deform it, disturbing the powder in the channel and preventing the powder from bridging and clogging the holes. The bottom of the filter plate 706 is fixed with a striking frame 801. With the vibration of the box, the rotating block 802 in the striking frame 801 drives the striking head 803 to intermittently strike the bottom surface of the filter plate 706, shaking off the powder adhering to the filter plate 706 and the elastic ring 707. The other is an active anti-clogging structure, in which the position of the filter plate 706 is fixed. The moving block 903 and the moving plate 902 are driven to reciprocate by the electric telescopic rod 905 in the fixed frame 904, which drives the diamond elastic ring 901 to continuously expand and contract. It can actively clear the screen holes without relying on the squeezing of the filter plate 703, and the stability of the working condition switching is stronger. After two-stage screening, the qualified powder passes through filter plate 706 and falls into guide trough frame 702, and is finally transported to conveyor belt 3 for outward transfer. As a preferred embodiment, an air supply component can be added to the top of the vibrating screening box 4, and a dust filter component can be set at the bottom of the box. The air supply component sends airflow into the box to form a dust barrier, which inhibits the dust from escaping outward. The dust-laden airflow is purified by the dust filter component, which improves the workshop working environment.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A raw material screening device for epoxy molding compound production, comprising a gantry (1), a discharging chute (2) is arranged at the top of the gantry (1), and a conveying belt (3) is arranged at the bottom of the gantry (1), characterized in that: The top of the conveyor belt (3) is provided with a vibrating screening box (4) located below the discharge port of the feed trough (2), and also includes: Vibration mechanism (5) is set on the top of the vibrating screening box (4). When working, the vibration mechanism (5) drives the vibrating screening box (4) to screen the powder falling from the feed trough (2). The guide trough frame (702) and filter plate 1 (703) are fixedly installed on the top of the conveyor belt (3) and the filter plate 1 (703) is fixedly installed inside the vibrating screening box (4) to perform preliminary screening of the powder falling from the feed trough (2). Filter plate two (706) is located inside the vibrating screening box (4) and below filter plate one (703). The bottom of filter plate two (706) is driven to move by the adjustment mechanism. A channel is provided between the bottom of filter plate one (703) and the top of filter plate two (706), and an anti-clogging mechanism is provided in the channel.

2. The raw material screening device for producing an epoxy molding compound according to claim 1, characterized in that: It also includes a striking frame (801), which is fixedly connected to the bottom of the filter plate (706). A rotating block (802) is rotatably connected to the inner side of the striking frame (801), and a striking head (803) is fixedly connected to the bottom of the rotating block (802).

3. The raw material screening device for producing an epoxy molding compound according to claim 2, characterized in that: The vibrating screening box (4) is detachably provided with a powder block collection shell (701) on the left side. The powder block collection shell (701) is provided with a filter groove at the bottom. The bottom of the vibrating screening box (4) is connected to the top of the guide trough frame (702).

4. The raw material screening device for producing an epoxy molding compound according to claim 3, characterized in that: The adjustment mechanism includes a support base (704) and an adjustment component (705). The bottom of the support base (704) is fixedly connected to the inner walls on both sides of the guide channel frame (702). The adjustment component (705) is located on the top of the support base (704). The bottom of the filter plate (706) is connected to the support base (704) through the adjustment component (705).

5. The raw material screening device for producing an epoxy molding compound according to claim 4, characterized in that: The anti-clogging mechanism includes an elastic ring (707). Both filter plate one (703) and filter plate two (706) are provided with through filter holes, and the diameter of the filter hole on filter plate two (706) is smaller than the diameter of the filter hole on filter plate one (703). The elastic ring (707) is located on the top of filter plate two (706) and outside the filter hole.

6. The raw material screening device for producing an epoxy molding compound according to claim 5, characterized in that: The anti-clogging mechanism includes a rhomboid elastic collar (901), which is located on the outside of the top filter hole of the filter plate (706). A movable plate (902) is fixedly connected to the left side of the rhomboid elastic collar (901), and a movable block (903) is fixedly connected to the bottom of the movable plate (902). A fixed frame (904) is fixedly connected to the bottom of the filter plate (706), and an electric telescopic rod (905) is fixedly connected to the inside of the fixed frame (904). The telescopic end of the electric telescopic rod (905) is connected to the movable block (903). When working, the electric telescopic rod (905) controls the movement of the movable block (903) and the movable plate (902), and drives the rhomboid elastic collar (901) to deform during the movement.

7. The raw material screening device for producing an epoxy molding compound according to claim 6, characterized in that: The vibration mechanism (5) includes a drive motor (501), which is located on the top of the vibration screening box (4). The output shaft of the drive motor (501) is connected to a pulley (502). A belt (503) is driven on the outside of the pulley (502). The other end of the pulley (502) is driven by the belt (503) to a pulley (504). A rotating shaft (505) is provided in the middle of the pulley (504) and passes through the front and rear sides of the vibration screening box (4). Eccentric wheels are provided at the front and rear ends of the rotating shaft (505) on the outside of the vibration screening box (4).

8. The raw material screening device for producing an epoxy molding compound according to claim 7, characterized in that: It also includes a support mechanism (6), which consists of a support platform (601), a damping connecting rod (602) and a support member (603). The support platform (601) is located on the top of the conveyor belt (3). The top of the support platform (601) is provided with a damping connecting rod (602). The top of the damping connecting rod (602) is connected to the support member (603). The support member (603) is connected to the outer wall of the vibrating screening box (4).

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