An extrusion apparatus for BMC bulk molding compound

Abstract

This utility model relates to the field of BMC material processing technology and discloses an extrusion device for BMC bulk molding compound, including a support platform. A kneading box is fixedly installed on the top of the support platform, and a conveying channel is fixedly installed on the bottom surface of the kneading box, extending through the bottom of the kneading box and out of the box. In this utility model, the unblocking component adopts an air pump-driven spindle block structure. When the material flow is abnormal, the air pump inputs gas into the sealed connecting cylinder, pushing the spindle block at the end of the piston rod forward. Its conical head can extend into the extrusion tube, breaking the solidified block through physical compression. At the same time, the gap design between the spindle block and the tube wall during the unblocking process avoids excessive friction. After unblocking, the air pump reverses the air flow to retract the piston rod, ensuring that the spindle block completely exits the extrusion channel without affecting normal extrusion. This achieves active intervention in blockage, eliminating the need to disassemble the equipment or stop the machine for heating, significantly reducing the risk of production interruption.

Description

Technical Field

[0001] This utility model relates to the field of BMC material processing technology, and in particular to an extrusion device for BMC bulk molding compound. Background Technology

[0002] BMC (bulk molding compound) is a thermosetting composite material widely used in electrical appliances, automobiles and other fields, but its extrusion process often faces technological challenges.

[0003] In traditional extrusion equipment, BMC raw materials are kneaded and then conveyed to the extrusion head via a screw. However, high-viscosity BMC materials are prone to localized solidification at the end of the extrusion tube due to increased flow resistance or temperature fluctuations, leading to blockages. Frequent shutdowns for unclogging not only reduce efficiency but can also result in material waste and equipment damage. Furthermore, material residue easily accumulates on the inner wall of the kneading chamber. Traditional equipment relies on manual cleaning or simple scraper structures, which are ill-suited to complex chamber shapes. Accumulated residue may mix with new material, affecting product uniformity.

[0004] In existing technologies, unblocking mechanisms mostly employ mechanical push rods or external heating. The former easily wears down pipes, while the latter may cause thermal degradation of materials. Meanwhile, internal wall cleaning devices often have fixed structures, making it impossible to conform to curved surfaces or dynamically adjust, resulting in limited cleaning effectiveness. Therefore, we propose an extrusion device for BMC (bulk molding compound). Utility Model Content

[0005] The present invention aims to solve the technical problems existing in the prior art and provide an extrusion device for BMC bulk molding compound.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an extrusion device for BMC (bulk molding compound), comprising a support platform, a kneading box fixedly installed above the support platform, a conveying channel fixedly installed on the bottom surface of the kneading box, the conveying channel extending through the bottom of the kneading box to the outside of the kneading box, a conveying rod rotatably installed inside the conveying channel, an extrusion head fixedly installed at the end of the conveying channel, an extrusion tube fixedly installed at the end of the extrusion head, a unblocking component for unblocking the inside of the extrusion tube provided inside the extrusion head, the unblocking component including a horizontally movable spindle block, and a concentrating component provided inside the kneading box, the concentrating component including two cleaning rods for cleaning the inner wall of the kneading box.

[0007] Preferably, the unblocking assembly further includes a support frame fixedly installed inside the extruder head, a connecting block fixedly installed at the upper end of the support frame, the end of the conveying rod rotatably connected to the outer wall of the connecting block, a connecting cylinder fixedly installed on the other side of the outer wall of the connecting block, a piston rod slidably installed at the end of the connecting cylinder, a spindle block fixedly located at the end of the piston rod near the extrusion tube, an air pump fixedly installed on the outer wall of the extruder head, an air supply pipe fixedly connected to the output end of the air pump, and the other end of the air supply pipe fixedly connected to the connecting cylinder and communicating with the interior of the connecting cylinder.

[0008] Preferably, the centralized assembly further includes two electric slide rails fixedly installed on the inner walls of both ends of the kneading box. Electric slide tables are slidably installed on the outer walls of the opposite sides of the two electric slide rails. An installation plate is fixedly installed on the outer wall of the electric slide table. Two symmetrically arranged connecting rods are movably installed on the outer wall of the installation plate. The cleaning rod is fixedly connected to the ends of the connecting rods at both ends on the same side of the electric slide rail.

[0009] Preferably, a steering gear is rotatably mounted on the outer wall of the mounting plate at the corresponding position of the ends of the two connecting rods, the ends of the connecting rods are fixedly connected to the steering gears, and the two steering gears are meshed together.

[0010] Preferably, a baffle is fixedly installed at the lower end of the mounting plate, and the width of the baffle is matched with that of the electric slide rail.

[0011] Preferably, a battery is fixedly installed on the upper surface of the electric slide rail, and the battery is electrically connected to the electric slide rail.

[0012] Preferably, a flip cover is movably installed on the upper part of the conveying channel outside the kneading box. A hinge is connected to one edge of the flip cover, and the flip cover is rotatably connected to the conveying channel through the hinge. An extension plate is fixedly installed on the other edge of the flip cover, and multiple bolts are movably installed on the extension plate. The flip cover is connected to the other edge of the conveying channel through multiple bolts. Beneficial effects

[0013] This invention provides an extrusion device for BMC (bulk molding compound). It has the following advantages:

[0014] (1) The extrusion equipment for BMC bulk molding compound adopts a pump-driven spindle block structure for the unblocking component. When the material flow is abnormal, the pump inputs gas into the sealed connecting cylinder, pushing the spindle block at the end of the piston rod forward. Its conical head can extend into the extrusion tube and break the solidified block through physical extrusion. At the same time, the gap design between the spindle block and the tube wall during the unblocking process avoids excessive friction. After the unblocking is completed, the pump reverses the air to make the piston rod retract, ensuring that the spindle block completely exits the extrusion channel without affecting normal extrusion. This realizes active intervention in the blockage, without the need to disassemble the equipment or stop the machine for heating, greatly reducing the risk of production interruption.

[0015] (2) The extrusion equipment for BMC bulk molding compound has a centralized component that forms a dynamic cleaning system through electric slide rails, steering gears and cleaning rods. When the electric slide table moves up and down along the slide rails, the motor drives the steering gears to mesh and drive, causing the two connecting rods to rotate in opposite directions, which in turn drives the cleaning rods to scrape against the arc-shaped inner wall of the kneading box. The movement trajectory of the cleaning rods can be adaptively adjusted according to the cross-sectional shape of the box, thoroughly removing residual materials in dead corners. The baffles isolate the slide rail area to prevent materials from intruding and interfering with the electric components. The cleaned materials are centrally introduced into the conveying channel, reducing raw material waste. Attached Figure Description

[0016] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model;

[0020] Figure 3 This is a schematic diagram of another state of the spindle block structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the internal structure of the kneading box of this utility model;

[0022] Figure 5 This is a schematic diagram showing the disassembled structure of the mounting plate and the electric slide table of this utility model.

[0023] Legend: 1. Support platform; 2. Kneading box; 3. Conveying channel; 4. Flip cover; 5. Extruder head; 6. Extrusion tube; 7. Air pump; 8. Electric slide rail; 9. Battery; 10. Conveying rod; 11. Piston rod; 12. Connecting cylinder; 13. Air supply pipe; 14. Connecting block; 15. Support frame; 16. Cleaning rod; 17. Spindle block; 18. Connecting rod; 19. Baffle; 20. Electric slide table; 21. Mounting plate; 22. Steering gear. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1-5 As shown, an extrusion device for BMC (bulk molding compound) includes a support platform 1, a kneading box 2 fixedly mounted above the support platform 1, a conveying channel 3 fixedly mounted on the bottom surface of the kneading box 2, the conveying channel 3 extending through the bottom of the kneading box 2 to the outside of the kneading box 2, a conveying rod 10 rotatably mounted inside the conveying channel 3, an extrusion head 5 fixedly mounted at the end of the conveying channel 3, an extrusion tube 6 fixedly mounted at the end of the extrusion head 5, a unblocking component for unblocking the inside of the extrusion tube 6 provided inside the extrusion head 5, the unblocking component including a horizontally movable spindle block 17, and a concentrating component provided inside the kneading box 2, the concentrating component including two cleaning rods 1 for cleaning the inner wall of the kneading box 2. 6; After the raw material of BMC clump molding compound in the kneading box 2 is kneaded, it is conveyed outward through the conveying rod 10 in the conveying channel 3. When the material is conveyed to the extrusion head 5 located at the end of the conveying channel 3, it can be extruded outward through the end of the extrusion head 5. The spindle block 17 in the unblocking component can unblock the extrusion tube 6 located at the end of the extrusion head 5 to avoid internal blockage of the extrusion tube 6. The concentrating component located inside the kneading box 2 can gather the material inside the kneading box 2 into the conveying channel 3 located at the bottom of the kneading box 2. The cleaning rod 16 can also clean the inner wall of the kneading box 2 according to the shape of the inner wall of the kneading box 2, thereby avoiding material waste.

[0026] like Figure 3As shown, the unblocking assembly also includes a support frame 15 fixedly installed inside the extruder head 5. A connecting block 14 is fixedly installed at the upper end of the support frame 15. The end of the conveying rod 10 is rotatably connected to the outer wall of the connecting block 14. A connecting cylinder 12 is fixedly installed on the other outer wall of the connecting block 14. A piston rod 11 is slidably installed at the end of the connecting cylinder 12. A spindle block 17 is fixedly located at the end of the piston rod 11 near the extrusion tube 6. An air pump 7 is fixedly installed on the outer wall of the extruder head 5. An air supply pipe 13 is fixedly connected to the output end of the air pump 7. The other end of the air supply pipe 13 is connected to the connecting cylinder 12. The piston rod 11 is fixedly connected and communicates with the inside of the connecting cylinder 12. Gas is introduced into the inside of the connecting cylinder 12 through the air pump 7 and the air supply pipe 13. The inside of the connecting cylinder 12 is sealed. Under the action of air pressure, the piston rod 11 is pushed forward to slide. Then, the spindle block 17 set at the end of the piston rod 11 clears the inside of the extrusion pipe 6. When not in use, the gas inside the connecting cylinder 12 is extracted by the air pump 7. Then the piston rod 11 is stored inside the connecting cylinder 12, and the spindle block 17 is away from the extrusion pipe 6 to avoid affecting the normal extrusion of material from the extrusion pipe 6.

[0027] like Figure 4 As shown, the centralized assembly also includes two electric slide rails 8 fixedly installed on the inner walls of both ends of the kneading box 2. Electric slide tables 20 are slidably installed on the outer walls of the opposite sides of the two electric slide rails 8. Mounting plates 21 are fixedly installed on the outer walls of the electric slide tables 20. Two symmetrically arranged connecting rods 18 are movably installed on the outer walls of the mounting plates 21. The cleaning rods 16 are fixedly connected to the ends of the connecting rods 18 on the same side of the electric slide rails 8. By rotating the two sets of connecting rods 18 located on both sides inside the kneading box 2 at the same time, the cleaning rods 16 located at their ends can be driven by the connecting rods 18 to clean the inner wall of the kneading box 2. The two sets of connecting rods 18 can slide downwards first and then rotate, so that the inner wall of the kneading box 2 can be cleaned according to the cross-sectional shape characteristics of the kneading box 2.

[0028] like Figure 5 As shown, a steering gear 22 is rotatably mounted on the outer wall of the mounting plate 21 at the corresponding position of the ends of the two connecting rods 18. The ends of the connecting rods 18 and the steering gears 22 are fixedly connected, and the two steering gears 22 are meshed. A motor is provided on the outer wall of the mounting plate 21 at the corresponding position of one of the steering gears 22. When the motor is powered on, it drives one of the steering gears 22 to rotate. Under the action of meshing transmission, the two connecting rods 18 can rotate in opposite directions. When the two connecting rods 18 rotate downward at the same time, they can drive the cleaning rod 16 located at their ends to clean the lower inner wall of the arc-shaped kneading box 2.

[0029] like Figure 5As shown, a baffle 19 is fixedly installed at the lower end of the mounting plate 21, and the width of the baffle 19 is matched with the electric slide rail 8. The baffle 19 can slide up and down with the mounting plate 21. The function of the baffle 19 is to block the electric slide rail 8 and prevent the mixed materials inside the box 2 from affecting the normal sliding of the electric slide table 20 connected to the electric slide rail 8.

[0030] like Figure 5 As shown, a battery 9 is fixedly installed on the upper surface of the electric slide rail 8, and the battery 9 is electrically connected to the electric slide rail 8; the electric slide rail 8 can be independently powered by the battery 9, and after the electric slide rail 8 is powered on, it can drive the electric slide table 20 slidably installed on its outer wall to slide up and down.

[0031] like Figure 1 As shown, a flip cover 4 is movably installed on the upper end of the conveying channel 3 outside the kneading box 2. A hinge is connected to one edge of the flip cover 4, and the flip cover 4 is rotatably connected to the conveying channel 3 through the hinge. An extension plate is fixedly installed on the other edge of the flip cover 4, and multiple bolts are movably installed on the extension plate. The flip cover 4 is connected to the other edge of the conveying channel 3 through multiple bolts. Sealing gaskets are provided at the connection between the flip cover 4 and the conveying channel 3 to ensure the airtightness of the conveying channel 3 after the flip cover 4 is closed on the conveying channel 3. After removing the multiple bolts, the flip cover 4 can be flipped over to expose the conveying rod 10 installed inside the conveying channel 3, which makes it easier to clean the conveying rod 10 inside the conveying channel 3.

[0032] The working principle of this utility model is as follows: During use, the controller controls the opening and closing of components such as 8 and 7 in the device. The controller can be a CPM1A PLC controller. The raw material for producing BMC bulk molding compound is kneaded inside the kneading box 2 and then conveyed outward through the conveying channel 3. The conveying channel 3 is equipped with a conveying rod 10, which rotates under the drive of a servo motor to continuously convey the BMC plastic raw material to the end of the conveying channel 3 and extruded outward through the extruder 5. Gas is introduced into the connecting cylinder 12 through the air pump 7 and the air supply pipe 13. The inside of the connecting cylinder 12 is sealed. Under the action of air pressure, the piston rod 11 is pushed forward to slide, and then the spindle block 17 at the end of the piston rod 11 clears the inside of the extrusion tube 6. When not in use, the air pump 7 is used to remove the gas inside the connecting cylinder 12, and the piston rod 11 is stored in the connecting cylinder. Inside the 12, the spindle block 17 is located away from the extrusion tube 6 to avoid affecting the normal extrusion of material from the extrusion tube 6. By rotating simultaneously, two sets of connecting rods 18 located on both sides inside the kneading box 2 can drive the cleaning rods 16 located at their ends to clean the inner wall of the kneading box 2. The two sets of connecting rods 18 can slide downwards first and then rotate, and can clean the inner wall of the kneading box 2 according to the cross-sectional shape of the kneading box 2. The concentrating component inside the kneading box 2 can gather the material inside the kneading box 2 into the conveying channel 3 located at the bottom of the kneading box 2. The cleaning rods 16 can also clean the inner wall of the kneading box 2 according to the shape of the inner wall of the kneading box 2, thereby avoiding material waste.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An extrusion apparatus for BMC (bulk molding compound), comprising a support platform (1), characterized in that: A kneading box (2) is fixedly installed above the support platform (1). A conveying channel (3) is fixedly installed on the bottom surface of the kneading box (2). The conveying channel (3) extends through the bottom of the kneading box (2) to the outside of the kneading box (2). A conveying rod (10) is rotatably installed inside the conveying channel (3). An extrusion head (5) is fixedly installed at the end of the conveying channel (3). An extrusion tube (6) is fixedly installed at the end of the extrusion head (5). A dredging component for unblocking the inside of the extrusion tube (6) is provided inside the extrusion head (5). The dredging component includes a horizontally movable spindle block (17). A concentrating component is provided inside the kneading box (2). The concentrating component includes two cleaning rods (16) for cleaning the inner wall of the kneading box (2).

2. The extrusion equipment for BMC bulk molding compound according to claim 1, characterized in that: The unblocking assembly also includes a support frame (15) fixedly installed inside the extruder (5). A connecting block (14) is fixedly installed at the upper end of the support frame (15). The end of the conveying rod (10) is rotatably connected to the outer wall of the connecting block (14). A connecting cylinder (12) is fixedly installed on the other side of the outer wall of the connecting block (14). A piston rod (11) is slidably installed at the end of the connecting cylinder (12). A spindle block (17) is fixed at the end of the piston rod (11) near the extrusion tube (6). An air pump (7) is fixedly installed on the outer wall of the extruder (5). An air supply pipe (13) is fixedly connected to the output end of the air pump (7). The other end of the air supply pipe (13) is fixedly connected to the connecting cylinder (12) and communicates with the interior of the connecting cylinder (12).

3. An extrusion apparatus for BMC bulk molding compound according to claim 2, characterized in that: The centralized assembly also includes two electric slide rails (8) fixedly installed on the inner walls of both ends of the kneading box (2). Electric slide tables (20) are slidably installed on the outer walls of the opposite sides of the two electric slide rails (8). An installation plate (21) is fixedly installed on the outer wall of the electric slide table (20). Two symmetrically arranged connecting rods (18) are movably installed on the outer wall of the installation plate (21). The cleaning rod (16) is fixedly connected to the ends of the connecting rods (18) arranged at both ends on the same side of the electric slide rail (8).

4. An extrusion apparatus for BMC bulk molding compound according to claim 3, characterized in that: The outer wall of the mounting plate (21) and the corresponding positions of the ends of the two connecting rods (18) are rotatably mounted with steering gears (22). The ends of the connecting rods (18) and the steering gears (22) are fixedly connected, and the two steering gears (22) are meshed together.

5. An extrusion apparatus for BMC bulk molding compound according to claim 4, characterized in that: A baffle (19) is fixedly installed at the lower end of the mounting plate (21), and the width of the baffle (19) is matched with the electric slide rail (8).

6. An extrusion apparatus for BMC bulk molding compound according to claim 5, characterized in that: A battery (9) is fixedly installed on the upper end face of the electric slide rail (8), and the battery (9) is electrically connected to the electric slide rail (8).

7. An extrusion apparatus for BMC bulk molding compound according to claim 6, characterized in that: The conveying channel (3) is movably mounted with a flip cover (4) at the upper end outside the kneading box (2). A hinge is connected to one side edge of the flip cover (4), and the flip cover (4) is rotatably connected to the conveying channel (3) through the hinge. An extension plate is fixedly mounted on the other side edge of the flip cover (4), and multiple bolts are movably mounted on the extension plate. The flip cover (4) is connected to the other side edge of the conveying channel (3) through multiple bolts.

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