Powder material screening mechanism for epoxy molding compound

Abstract

The utility model relates to epoxy molding compound production technical field, concretely relates to a kind of powder raw material screening mechanism of epoxy molding compound, including the fixed cylinder of fixed in the top of screening machine body, the screening mechanism further includes: rotary screening subassembly, it includes the screening cylinder of coaxial in fixed cylinder, one end of the screening cylinder is equipped with end baffle ring, support subassembly, it includes the support arm fixed on screening machine body, the top end of the support arm is bent and extended to screening cylinder inside and is equipped with mounting groove.The utility model is driven by driving part while driving screening cylinder rotation, through reciprocating linkage part between being arranged in screening cylinder interior and two racks, realize synchronous drive two racks alternate do up and down reciprocating motion, and drive two brushes synchronous do alternate up and down reciprocating motion, so as to be convenient for the impact force of the up and down motion of two brushes and the flexibility of bristle, the epoxy resin powder of knot can be rubbed and broken quickly and efficiently, avoid its jamming screen hole due to knot.

Description

Technical Field

[0001] This utility model relates to the field of epoxy molding compound production technology, and in particular to a powder raw material screening mechanism for epoxy molding compounds. Background Technology

[0002] Epoxy molding compound is a powdered molding compound made by using epoxy resin as the base resin, high-performance phenolic resin as the curing agent, and adding fillers such as silica powder and various other additives. When the particle size of epoxy resin is large, its normal softening point is generally greater than or equal to 98℃, and the softening point of epoxy resin is inversely proportional to its particle size. However, the epoxy resin powder used in the production of epoxy molding compounds has a powder size of less than 45 micrometers, and its softening point is relatively low (around 55℃). When used after storage, some epoxy resin powder may clump together and clog the sieve holes.

[0003] To solve the above technical problems, existing screening machines have rotating crushing rollers installed inside the feed hopper. The rotating crushing rollers impact the falling powder material, breaking up and separating the agglomerated powder material. However, it is difficult to precisely adjust the rotation speed of the crushing rollers to an appropriate value. This can easily result in the crushing rollers impacting the powder material with slightly too much or too little force, causing some powder to stick to the inner wall of the feed hopper or not completely breaking up the agglomerated powder, resulting in relatively large particle clusters clogging the screen holes. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a powder raw material screening mechanism for epoxy molding compound, so as to solve the problem that the rotation speed of the crushing roller is difficult to be precisely adjusted to an appropriate value, which makes it easy for the crushing roller to impact the powder raw material with slightly too much or too little force, resulting in some powder sticking to the inner wall of the feed hopper, or incomplete crushing of agglomerated powder, resulting in relatively large particle agglomerates clogging the screen holes.

[0005] To achieve the above objectives, this utility model provides a powder raw material screening mechanism for epoxy molding compounds, including a fixed cylinder fixed to the top of the screening machine body, and the screening mechanism further includes:

[0006] A rotary screening assembly includes a screening cylinder coaxially disposed within a fixed cylinder, and one end of the screening cylinder is provided with an end retaining ring.

[0007] A support assembly includes a support arm fixed to the body of the screening machine, the top end of which is bent and extends into the screening cylinder and is provided with a mounting groove.

[0008] A double-acting crushing assembly, comprising two racks disposed opposite each other within a mounting slot.

[0009] A brush fixed to the bottom of a rack.

[0010] Drive component, used to drive the rotation of the screening cylinder.

[0011] The linkage component, located between the inner wall of the screening cylinder and the rack, converts the rotational motion of the screening cylinder into the alternating reciprocating lifting motion of the two racks, which drives the brush to knead and break up the clumps of raw material powder.

[0012] Preferably, the rotary screening assembly further includes a spiral strip axially fixed to the inner wall of the screening cylinder and screen holes uniformly disposed between the inner and outer sides of the screening cylinder, wherein the inner diameter of the screen holes gradually increases along the axial direction of the screening cylinder.

[0013] Preferably, the sieve holes are located within the helical gap range of the spiral strip, and the inner diameter of the sieve holes closest to the end retaining ring is the smallest.

[0014] Preferably, the linkage assembly includes three support rods circumferentially fixed to the inner wall of the screening cylinder and a central disk coaxially disposed within the screening cylinder. The central disk is fixed between the three support rods. An undulating annular guide rail is provided on one of the vertical surfaces of the central disk. A slider is fixedly provided at the top of one of the racks. One end of the slider is slidably sleeved within the undulating annular guide rail. A transmission tooth is rotatably provided in the mounting groove. The two sides of the tooth surface of the transmission tooth mesh with the tooth surfaces of the two racks respectively.

[0015] Preferably, the undulating annular guide rail is located on the vertical surface of the central disk opposite to the rack, and the undulating annular guide rail is formed by a plurality of V-shaped grooves surrounding it circumferentially.

[0016] Preferably, the two racks are laterally positioned between the central disc and the end retaining ring, and the two racks are laterally positioned on both sides of the transmission teeth.

[0017] Preferably, the screening mechanism further includes a permanent magnet roller rotatably disposed inside the screening machine body, and the driving component further drives the permanent magnet roller to rotate.

[0018] Preferably, the drive assembly includes a servo motor for directly driving the permanent magnet roller and a flat gear fixedly sleeved on the permanent magnet roller. A toothed ring is fixedly sleeved on one end of the outer side of the screening cylinder, and the tooth surface of the toothed ring meshes with the tooth surface of the flat gear.

[0019] The beneficial effects of this utility model are:

[0020] This invention drives the screening cylinder to rotate via a drive unit. Simultaneously, a reciprocating linkage unit located inside the screening cylinder and between the two racks synchronously drives the two racks to perform alternating up-and-down reciprocating motions, which in turn drives the two brushes to perform alternating up-and-down reciprocating motions. This allows the impact force of the brushes' up-and-down motion and the flexibility of the brush bristles to quickly and efficiently break up clumps of epoxy resin powder, preventing it from clogging the screen holes. At the same time, if a small amount of epoxy resin powder adheres to the inner wall of the screening cylinder due to the impact force, it can be swept away and separated by the brushes, preventing epoxy resin powder from sticking together and affecting feeding efficiency and material waste. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional illustration of the present invention. Figure 1 ;

[0023] Figure 2 This is a three-dimensional illustration of the present invention. Figure 2 ;

[0024] Figure 3 This is a three-dimensional illustration of the present invention. Figure 3 ;

[0025] Figure 4 This is a three-dimensional illustration of the present invention. Figure 4 ;

[0026] Figure 5 This is a three-dimensional illustration of the present invention. Figure 5 ;

[0027] Figure 6 This is a three-dimensional illustration of the present invention. Figure 6 .

[0028] The diagram is marked as follows:

[0029] 1. Fixed cylinder; 2. Rotary screening assembly; 21. End retaining ring; 22. Spiral strip; 23. Screen hole; 24. Screening cylinder; 3. Support assembly; 31. Support arm; 32. Mounting groove; 4. Double-acting crushing assembly; 41. Rack; 42. Brush; 5. Drive assembly; 6. Linkage assembly; 61. Support rod; 62. Central plate; 63. Irregular ring guide rail; 64. Transmission gear; 65. Slider; 7. Permanent magnet roller; 8. Electrostatic separation section; 9. Air classifier; 10. Feeding component; 11. Sorting chute. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0031] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] like Figures 1 to 6 As shown, a powder raw material screening mechanism for epoxy molding compound includes a fixed cylinder 1 fixed to the top of the screening machine body. The screening mechanism also includes:

[0033] The rotary screening assembly 2 includes a screening cylinder 24 coaxially disposed inside the fixed cylinder 1. One end of the screening cylinder 24 is provided with an end retaining ring 21. The end of the screening cylinder 24 away from the end retaining ring 21 is open. Finally, the larger particles of raw material will fall out from the inside of the screening cylinder 24. This design allows the end retaining ring 21 to prevent the powder raw material from accumulating too much at the original location and leaking outward when the powder raw material is fed.

[0034] The support assembly 3 includes a support arm 31 fixed to the screening machine body, the top end of the support arm 31 being bent and extending into the screening cylinder 24 and having an installation groove 32.

[0035] The double-acting crushing assembly 4 includes two racks 41 disposed opposite each other in the mounting groove 32.

[0036] A brush 42 is fixed to the bottom of the rack 41. The shape of the brush 42 matches the inner wall of the screening cylinder 24, and the bristle surface of the brush 42 is opposite to the inner wall of the screening cylinder 24.

[0037] Drive component 5 is used to drive the screen cylinder 24 to rotate.

[0038] The linkage component 6, located between the inner wall of the screening cylinder 24 and the rack 41, converts the rotational motion of the screening cylinder 24 into the alternating reciprocating lifting motion of the two racks 41. This drives the brush 42 to knead and break up the clumps of raw material powder. During this process, the screening cylinder 24 and the brush 42 rotate relative to each other in the circumferential direction, which can knead the powder material between the brush 42 and the screening cylinder 24. In addition, the alternating lifting motion of the two racks 41 and the two brushes 42 can also squeeze the powder material. The combination of the two can smoothly knead and disperse the clumps of powder material and reduce the amount of powder material adhering to the inner wall of the screening cylinder 24. When the small amount of powder material adhering to the inner wall of the screening cylinder 24 rotates to the area below the brush 42, it can be swept and separated from the inner wall of the screening cylinder 24, avoiding the long-term adhesion of powder material and affecting the subsequent feeding of powder material.

[0039] like Figure 3 , Figure 4 and Figure 6 As shown, the rotary screening assembly 2 also includes a spiral strip 22 axially fixed to the inner wall of the screening cylinder 24 and screen holes 23 uniformly arranged between the inner and outer sides of the screening cylinder 24. The screen holes 23 are located within the spiral gap of the spiral strip 22, and the inner diameter of the screen holes 23 closest to the end retaining ring 21 is the smallest. The inner diameter of the screen holes 23 gradually increases along the axial direction of the screening cylinder 24. This design allows the powder material to quickly enter the gap of the spiral strip 22 during the rotation of the screening cylinder 24. Then, the powder material moves axially towards the end of the screening cylinder 24 away from the end retaining ring 21 along the guide axis of the spiral strip 22. During this process, the powder material is screened through the screen holes 23 with gradually increasing inner diameter. In this way, the powder material can be screened into different grades according to size, so as to facilitate subsequent more detailed impurity removal screening.

[0040] like Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the linkage component 6 includes three support rods 61 circumferentially fixed to the inner wall of the screening cylinder 24 and a central disk 62 coaxially disposed within the screening cylinder 24. The central disk 62 is fixed between the three support rods 61. An undulating annular guide rail 63 is provided on one of the vertical surfaces of the central disk 62. The undulating annular guide rail 63 is located on the vertical surface of the central disk 62 opposite to the rack 41, and the undulating annular guide rail 63 is formed by several V-shaped grooves circumferentially enclosing it. A slider 65 is fixedly provided at the top of one of the racks 41. One end of the slider 65 is slidably sleeved in the undulating annular guide rail 63. A transmission tooth 64 is rotatably provided in the mounting groove 32. Two racks 41 are laterally located between the central disk 62 and the end retaining ring 21, and the two racks 41 are laterally located on both sides of the transmission tooth 64. The two sides of the tooth surface of the transmission tooth 64 mesh with the tooth surfaces of the two racks 41 respectively.

[0041] This design allows the undulating annular guide rail 63 to rotate synchronously when the screening cylinder 24 rotates, causing the slider 65 to move up and down inside the undulating annular guide rail 63. This, in turn, drives one of the racks 41 to move up and down synchronously. Through the power transmission of the transmission gear 64, the two racks 41 move up and down alternately. This efficiently kneads and squeezes the powder raw material entering the screening cylinder 24, breaking up any clumps of powder raw material. This allows the powder raw material to pass through the screening smoothly, preventing clumps of powder raw material from clogging the screen holes 23, reducing the probability of clogging, and improving the accuracy and efficiency of powder raw material screening.

[0042] like Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, the screening mechanism also includes a permanent magnet roller 7 that is rotatably installed inside the screening machine body. The drive component 5 also drives the permanent magnet roller 7 to rotate. After being screened by the screening cylinder 24, powders of the same size and grade are concentrated on a fixed section of the permanent magnet roller 7 along its axis.

[0043] The screening machine body is provided with a feeding component 10, an electrostatic separation section 8, a separation chute 11 and an air separator 9 in the following order from top to bottom. The feeding component 10 includes a vertical bar and an inclined bar that are fixed horizontally inside the screening machine body. The top of the inclined bar is located directly below the permanent magnet roller 7, and the vertical bar and the inclined bar together form a figure-eight shape. The wide opening of the figure-eight shape faces the permanent magnet roller 7, and the narrow opening of the figure-eight shape faces the separation roller.

[0044] The electrostatic sorting unit 8 includes a sorting drum that is rotatably disposed inside the screening machine body and a high-voltage electrode that is laterally fixed inside the screening machine body. A discharge brush is rotatably disposed inside the screening machine body, and the sorting drum is laterally located between the high-voltage electrode and the discharge brush.

[0045] A scraper is fixedly provided on one side of the permanent magnet roller 7 to remove the metal adsorbed on the surface of the permanent magnet roller 7. A collection box is fixedly provided inside the screening machine body to collect the metal particles or powder scraped off by the scraper. The powder raw material that is not adsorbed by the permanent magnet roller 7 falls precisely onto the outer wall of the sorting drum through the figure-eight feeding part 10. Due to the principle of electrostatic adsorption, the fiber, powder raw material and non-ferromagnetic metal are adsorbed onto the outer wall of the sorting drum. The adsorbed fiber, powder raw material and non-ferromagnetic metal first pass through the range of the high voltage electrode. The magnetic field generated by the high voltage electrode causes the non-ferromagnetic metal to separate and fall out due to the influence of the magnetic field. The fiber and powder raw material are swept off by the unloading brush and slide into the corresponding air classifier 9 through the sorting slide 11. By the different densities of the same size fiber and powder raw material, the lighter fiber is separated from the powder raw material, which improves the screening accuracy and purity of the powder raw material and avoids the purity of the powder raw material affecting the production quality of the subsequent epoxy molding compound.

[0046] The drive assembly 5 includes a servo motor for directly driving the permanent magnet roller 7 and a flat gear fixedly sleeved on the permanent magnet roller 7. A toothed ring is fixedly sleeved on one end of the screening cylinder 24. The toothed surface of the toothed ring meshes with the toothed surface of the flat gear. The output end of the servo motor is fixedly connected to one end face of the permanent magnet roller 7, and the flat gear is located on the other end face of the permanent magnet roller 7.

[0047] Working principle: First, start the drive assembly 5, which drives the permanent magnet roller 7 and the screening cylinder 24 to rotate simultaneously. Through the motion conversion of the linkage assembly 6, the two racks 41 move up and down alternately and synchronously drive the brush 42 to move. At this time, the brush 42 and the screening cylinder 24 form a relative displacement in the circumferential direction. In this way, the powder material fed into the screening cylinder 24 is crushed by the bristles of the brush 42, preventing the powder material from clumping and entering the screening step and clogging the screen holes 23. It can also sweep away the small amount of powder material adhering to the inner wall of the screening cylinder 24. During the rotation of the screening cylinder 24, the powder material quickly enters the gap of the spiral strip 22. Then, the powder material moves axially into the screening cylinder 24 away from the end retaining ring 21 with the guide axis of the spiral strip 22. During this process, the powder material is screened through the screen holes 23 with gradually increasing inner diameter. In this way, the powder material is sequentially sorted into larger and smaller sizes. The small sieve separates the powder into different grades. Powder of the same grade and size is concentrated on a fixed section along the axis of the permanent magnet roller 7. Metal adsorbed on the surface of the permanent magnet roller 7 is scraped off by the scraper and falls into the collection box. Powder raw materials not adsorbed by the permanent magnet roller 7 are accurately dropped onto the outer wall of the sorting drum through the figure-eight feeding part 10. Due to the principle of electrostatic adsorption, fibers, powder raw materials and non-ferromagnetic metals are adsorbed on the outer wall of the sorting drum. The adsorbed fibers, powder raw materials and non-ferromagnetic metals first pass through the range of the high voltage electrode. The magnetic field generated by the high voltage electrode causes the non-ferromagnetic metals to separate and fall out due to the influence of the magnetic field. Fibers and powder raw materials are unloaded and brushed off and slide into the corresponding air classifier 9 through the sorting slide 11. By using the different densities of fibers and powder raw materials of the same size, the lighter fibers are separated from the powder raw materials, improving the screening accuracy and purity of the powder raw materials and avoiding the impact of the purity of the powder raw materials on the production quality of subsequent epoxy molding compounds.

[0048] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0049] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A powder raw material screening mechanism for epoxy molding compound, comprising a fixed cylinder (1) fixed to the top of the screening machine body, characterized in that, The screening mechanism also includes: A rotating screening assembly (2) includes a screening cylinder (24) coaxially disposed within a fixed cylinder (1), and one end of the screening cylinder (24) is provided with an end retaining ring (21); The support assembly (3) includes a support arm (31) fixed to the body of the screening machine, the top end of which is bent and extends into the screening cylinder (24) and is provided with a mounting groove (32); The double-acting crushing assembly (4) includes two racks (41) disposed opposite each other in the mounting groove (32); A brush (42) fixed to the bottom of the rack (41); Drive component (5) is used to drive the screening cylinder (24) to rotate; The linkage component (6) is located between the inner wall of the screening cylinder (24) and the rack (41), which converts the rotational motion of the screening cylinder (24) into the alternating reciprocating lifting motion of the two racks (41), thereby driving the brush (42) to knead and break up the agglomerated raw material powder.

2. The powder raw material screening mechanism for epoxy molding compound according to claim 1, characterized in that, The rotary screening assembly (2) also includes a spiral strip (22) axially fixed on the inner wall of the screening cylinder (24) and sieve holes (23) uniformly arranged between the inner and outer sides of the screening cylinder (24), the inner diameter of the sieve holes (23) gradually increasing along the axial direction of the screening cylinder (24).

3. The powder raw material screening mechanism for epoxy molding compound according to claim 2, characterized in that, The sieve hole (23) is located within the spiral gap of the spiral strip (22), and the inner diameter of the sieve hole (23) closest to the end retaining ring (21) is the smallest.

4. The powder raw material screening mechanism for epoxy molding compound according to claim 1, characterized in that, The linkage component (6) includes three support rods (61) circumferentially fixed on the inner wall of the screening cylinder (24) and a central disk (62) coaxially disposed in the screening cylinder (24). The central disk (62) is fixed between the three support rods (61). An undulating annular guide rail (63) is provided on one of the vertical surfaces of the central disk (62). A slider (65) is fixed at the top of one of the racks (41). One end of the slider (65) is slidably sleeved in the undulating annular guide rail (63). A transmission tooth (64) is rotatably disposed in the mounting groove (32). The two sides of the tooth surface of the transmission tooth (64) mesh with the tooth surfaces of the two racks (41) respectively.

5. The powder raw material screening mechanism for epoxy molding compound according to claim 4, characterized in that, The undulating annular guide rail (63) is located on the vertical surface of the central disk (62) opposite to the rack (41), and the undulating annular guide rail (63) is formed by a number of V-shaped grooves surrounding it circumferentially.

6. The powder raw material screening mechanism for epoxy molding compound according to claim 4, characterized in that, The two racks (41) are laterally located between the central disc (62) and the end retaining ring (21), and the two racks (41) are laterally located on both sides of the transmission teeth (64).

7. The powder raw material screening mechanism for epoxy molding compound according to claim 1, characterized in that, The screening mechanism also includes a permanent magnet roller (7) that is rotatably disposed inside the screening machine body, and the driving component (5) also drives the permanent magnet roller (7) to rotate.

8. The powder raw material screening mechanism for epoxy molding compound according to claim 7, characterized in that, The drive assembly (5) includes a servo motor for directly driving the permanent magnet roller (7) and a flat gear fixedly sleeved on the permanent magnet roller (7). A toothed ring is fixedly sleeved on one end of the screening cylinder (24), and the tooth surface of the toothed ring meshes with the tooth surface of the flat gear.

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