A machine for the continuous production of BMC masses with single screw

Abstract

The utility model provides a kind of single screw continuous production BMC mass machine equipment, and it is related to BMC mass production technical field, including double-layer heat preservation material box (outer heat preservation box body+inner heat preservation box body), single screw in inner heat preservation box, and the drive motor and circulating liquid pump of one side of material box.Single screw is divided into feeding section (large pitch, feeding groove depth gradually changes), compression section (pitch gradually changes+circumferential dispersion boss), metering section (small pitch);Drive motor is directly connected single screw, outer heat preservation box pre-buried liquid pipe is connected circulating liquid pump, inner heat preservation box outer wall is equipped with spiral heating pipe (connects heater), inner wall is equipped with flow guide groove.Drive motor drives single screw to realize BMC mass " feeding-compression-mixing-metering-discharge" continuous processing, double-layer heat preservation+liquid pipe+heating pipe temperature control, flow guide groove helps mixing to reduce shear.Solve the problem of traditional intermittent equipment low efficiency, double screw glass fiber, improve production continuity and product quality, reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of BMC pellet production technology, and in particular to a machine for continuous production of BMC pellets using a single screw. Background Technology

[0002] BMC (Bio-Modifying Molding Compound) is a composite molding compound containing resin, glass fiber, and fillers. Due to its good moldability and excellent mechanical properties, it is widely used in electrical, automotive, and other fields. Its production requires processes such as raw material mixing and plasticizing, and places high demands on the continuity of equipment, the uniformity of mixing, and the protection of glass fibers.

[0003] Existing production equipment is mainly divided into two categories: one is intermittent mixing equipment, which processes by batch mixing, resulting in problems such as discontinuous production, low efficiency, and large quality fluctuations between batches, making it difficult to meet the needs of large-scale production; the other is twin-screw continuous equipment, which achieves continuous production, but the strong shearing force generated during the twin-screw meshing process can easily cause glass fiber breakage and damage, reduce the mechanical properties of BMC lumps, and has a complex structure and high maintenance costs.

[0004] In addition, existing equipment generally suffers from insufficient temperature control accuracy, which can easily lead to poor material plasticization due to local overheating or uneven temperature, affecting product quality stability, while also consuming a lot of energy.

[0005] Based on this, the present invention provides a machine for continuous production of BMC pellets using a single screw to solve one or more of the problems mentioned above. Utility Model Content

[0006] This invention provides a machine for continuous production of BMC pellets using a single screw, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution, including a material bin, a drive motor and a circulating liquid pump installed on one side of the material bin, a discharge port on the other side of the material bin, a single screw installed inside the material bin, and the drive motor driving the single screw to rotate; The single screw includes a feeding section, a compression section and a metering section arranged in sequence. The pitch of the feeding section is greater than that of the metering section, and the pitch of the compression section gradually decreases from the end closer to the feeding section to the end closer to the metering section. The compression section of the single screw is equipped with multiple distributed protrusions, which are evenly distributed along the circumference of the single screw.

[0008] Preferably, the material box consists of an outer insulation box and an inner insulation box. The outer insulation box is fitted onto the outer wall of the inner insulation box, and the right outer wall of the inner insulation box is fixedly connected to the right inner wall of the outer insulation box.

[0009] Preferably, the output shaft of the drive motor extends movably into the inner insulation box, and the single screw is located inside the inner insulation box.

[0010] Preferably, one end of the single screw is fixedly connected to the output shaft of the drive motor, and the other end of the single screw is rotatably connected to the inner wall of the inner insulation box.

[0011] Preferably, the inlet penetrates the outer insulation box and extends into the inner insulation box.

[0012] Preferably, a liquid pipe is installed inside the outer insulation box shell, and both ends of the liquid pipe extend out of the outer insulation box and are connected to the circulating liquid pump.

[0013] Preferably, a spiral heating tube is installed around the outer wall of the inner insulation box, and a heater is used to heat the spiral heating tube.

[0014] Preferably, the heater is fixed to the outer wall of the inner insulation box.

[0015] Preferably, the feed section surface of the single screw is provided with a spiral feeding groove, and the depth of the feeding groove gradually decreases from the feed end to the compression section.

[0016] Preferably, the inner wall of the inner insulation box is provided with multiple axially extending guide grooves corresponding to the position of the single screw compression section.

[0017] Compared with the prior art, the beneficial effects of this utility model are: First, through the collaboration of the independent raw material supply system and the controller, the proportion and supply speed of each raw material can be precisely controlled. Combined with the structural optimization of the single screw extrusion system (gradient design of the feeding section, compression section and metering section) and the staggered mixing unit of the static mixer, the material is ensured to be mixed evenly and the plasticizing effect is stable, which effectively improves the consistency of product quality and avoids quality fluctuations caused by proportion deviation or uneven mixing. Secondly, the dispersing protrusions in the single-screw compression section cooperate with the guide grooves on the inner wall of the barrel to enhance the material shearing and mixing effect while avoiding the excessive shearing problem of the twin-screw meshing type, significantly reducing glass fiber damage and fully preserving the mechanical properties of BMC lumps. Third, the adoption of a single-screw structure instead of the traditional complex twin-screw structure simplifies the overall equipment structure, reduces manufacturing costs and post-maintenance difficulties, and facilitates the promotion and application of the equipment. In addition, the double-layer insulation structure of the material box, the uniform heating design of the spiral heating tube, and the temperature control coordination between the circulating liquid pump and the liquid pipe can effectively reduce temperature loss and energy consumption, while maintaining a stable processing environment temperature, further ensuring the plasticization quality of materials and improving the adaptability and energy efficiency of the equipment under different working conditions. Attached Figure Description

[0018] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0019] In the attached diagram: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the material box of this utility model.

[0020] In the diagram: 1. Feed hopper; 2. Single screw; 3. Drive motor; 4. Circulating liquid pump; 5. Feed inlet; 6. Discharge outlet; 7. Outer insulation box; 8. Inner insulation box; 9. Liquid pipe; 10. Spiral heating tube; 11. Heater. Detailed Implementation

[0021] 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.

[0022] Furthermore, in this utility model, 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 utility model. They are merely used to distinguish components or operations described using the same technical terms, and should not be construed as indicating or implying their 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 the combination of technical solutions is contradictory or impossible to implement, such a combination should be considered non-existent and not within the scope of protection claimed by this utility model.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Please see Figures 1-2 The present invention provides a technical solution, including a material box 1, a drive motor 3 and a circulating liquid pump 4 installed on one side of the material box 1, a discharge port 6 provided on the other side of the material box 1, a single screw 2 installed inside the material box 1, and the drive motor 3 driving the single screw 2 to rotate. The single screw 2 includes a feeding section, a compression section and a metering section arranged in sequence. The pitch of the feeding section is greater than that of the metering section, and the pitch of the compression section gradually decreases from the end closer to the feeding section to the end closer to the metering section. The compression section of the single screw 2 is provided with multiple dispersed protrusions, which are evenly distributed along the circumference of the single screw 2.

[0025] This equipment uses the material bin 1 as the core cavity for material processing. After the drive motor 3 is powered on, it outputs power to directly drive the single screw 2 built into the material bin 1 to rotate around its own axis. After the raw material is put in through the feed port 5, it first enters the feeding section of the single screw 2. Because the pitch of the feeding section is greater than that of the metering section, the single screw 2 can quickly convey the raw material to the compression section through the larger pitch. When the material enters the compression section, its pitch gradually decreases from the end near the feeding section to the end near the metering section. The material is gradually compressed and compacted during the conveying process. At the same time, the circumferentially evenly distributed dispersion protrusions in the compression section rotate synchronously with the single screw 2 to stir and disperse the material and prevent it from agglomerating. Finally, the material enters the metering section with a smaller pitch. The metering section accurately controls the output rate of the material through the smaller pitch to ensure a stable output. The finally processed material is discharged from the discharge port 6 on the other side of the material bin 1. The circulating liquid pump 4, together with the subsequent temperature control structure such as liquid pipes and heating pipes, regulates the temperature of the processing environment inside the material bin 1 to ensure stable material processing conditions.

[0026] This equipment achieves continuous processing of BMC briquettes from "feeding-conveying-compression-mixing-metering-discharging" through the above-mentioned methods, solving the problem of low production efficiency of traditional intermittent equipment and significantly improving production continuity. The dispersing bumps in the compression section disperse the material only through stirring, avoiding excessive shearing in the twin-screw meshing type, effectively reducing glass fiber damage, and ensuring the mechanical properties of the BMC briquettes. The single-screw design with a pitch gradient of two feeding sections, compression section, and metering section optimizes the material conveying and processing rhythm—the large pitch feeding section ensures feeding speed, the gradually changing pitch compression section achieves material compaction, and the small pitch metering section controls discharge accuracy, improving the uniformity of material mixing and conveying stability, laying the foundation for subsequent plasticizing processes.

[0027] Furthermore, the material bin 1 consists of an outer insulated box 7 and an inner insulated box 8. The outer insulated box 7 is fitted onto the outer wall of the inner insulated box 8, and the right outer wall of the inner insulated box 8 is fixedly connected to the right inner wall of the outer insulated box 7. The material bin 1 adopts a double-layer nested structure of "outer insulated box 7 + inner insulated box 8". The inner insulated box 8 serves as the cavity for direct material processing. The outer insulated box 7 is tightly fitted onto the outer wall of the inner insulated box 8, and the right outer wall of the inner insulated box 8 is fixedly connected to the right inner wall of the outer insulated box 7, forming a closed double-layer insulation barrier. This structure can prevent the processing temperature inside the inner insulated box 8 from escaping to the external environment, while also isolating... The internal processing chamber is protected from interference from external low or high temperatures, maintaining the temperature inside the inner insulation box 8 within the stable range required for BMC material plasticization. This, combined with the heating function of the subsequent spiral heating tube 10, achieves precise temperature control. The double-layer insulation structure reduces temperature loss within the inner insulation box 8, preventing uneven material plasticization due to temperature fluctuations, such as localized unplasticized areas or localized overheating and scorching. This ensures product quality stability, eliminates the need for frequent activation of the heater 11 to maintain temperature, reduces energy waste, and lowers production costs. By isolating the equipment from external environmental temperature interference, it can adapt to different working conditions, expanding its application scenarios and enhancing its practicality.

[0028] Furthermore, the output shaft of the drive motor 3 extends into the inner insulation box 8, and the single screw 2 is located inside the inner insulation box 8. When the drive motor 3 starts, the output shaft can directly drive the single screw 2 to rotate inside the inner insulation box 8 without the need for an additional intermediate transmission structure. Power is directly transmitted to the single screw 2, and the single screw 2 directly contacts the raw material in the processing chamber to complete the material conveying and mixing. The above method has a short power transmission path, reduces power loss in intermediate transmission links, improves drive efficiency, avoids unstable speed of the single screw 2 due to transmission loss, and ensures uniform material conveying rate. In addition, the single screw 2 is built into the sealed processing chamber of the inner insulation box 8, and the material is processed in a closed environment throughout the process, reducing the contamination of the material by external dust and impurities and improving the purity of the BMC agglomerate finished product.

[0029] Furthermore, one end of the single screw 2 is fixedly connected to the output shaft of the drive motor 3, and the other end of the single screw 2 is rotatably connected to the inner wall of the inner insulation box 8 to form a "fixed support at both ends" installation structure. When the drive motor 3 drives the single screw 2 to rotate at high speed, the fixed support at both ends can limit the radial sway and axial displacement of the single screw 2, ensuring that the single screw 2 always runs stably at the central axis position of the inner insulation box 8, avoiding collision between the single screw 2 and the inner wall of the inner insulation box 8. Through the above method, the running stability of the single screw 2 is significantly improved, avoiding "uneven material conveying" caused by swaying, such as local leakage, local accumulation or "uneven mixing", ensuring production continuity and product quality consistency. Furthermore, the inlet 5 penetrates the top wall of the outer insulation box 7 vertically and extends directly to the upper part of the processing cavity of the inner insulation box 8 corresponding to the feeding section of the single screw 2. After the raw material is fed in from the inlet 5, it can fall directly into the feeding section of the single screw 2 in the inner insulation box 8 without passing through the gap between the outer insulation box 7 and the inner insulation box 8, thus realizing the conveying path of "direct entry into the cavity" of the raw material.

[0030] Furthermore, a continuous liquid pipe 9 is pre-embedded inside the shell of the outer insulation box 7. The two ends of the liquid pipe 9 pass through the side wall of the outer insulation box 7, extend to the outside of the box, and connect to the inlet and outlet of the circulating liquid pump 4 to form a "circulating liquid channel". When the equipment is running, the circulating liquid pump 4 starts and drives the coolant or temperature control medium to circulate continuously in the liquid pipe 9. If the heat dissipation of the inner insulation box 8 causes the internal temperature of the outer insulation box 7 to be too high, the circulating liquid in the liquid pipe 9 can absorb the excess heat. If auxiliary temperature control is required, the processing temperature of the inner insulation box 8 can also be indirectly stabilized by adjusting the temperature of the circulating liquid.

[0031] The above method achieves "active adjustment" of the temperature of the material box 1, avoiding the heat of the inner insulation box 8 from spreading outward and causing the outer insulation box 7 to overheat, thus protecting the external structure of the equipment, while maintaining the temperature stability of the inner insulation box 8 and ensuring the plasticizing effect of the material. In continuous production, excess heat inside the outer insulation box 7 can be removed by circulating fluid, avoiding material processing abnormalities such as resin overheating and degradation caused by local temperature accumulation, and improving product quality stability.

[0032] Furthermore, a spiral heating tube 10 is installed around the outer wall of the inner insulation box 8. The heater 11 is fixed to the outer wall of the inner insulation box 8 and electrically connected to the spiral heating tube 10. After the equipment is started, the heater 11 is powered on and heats up. The heat is transferred to the spiral heating tube 10 through direct heat conduction. Because the contact area between the spiral heating tube 10 and the outer wall of the inner insulation box 8 is large and evenly distributed, the heat can be quickly and evenly transferred to the inner wall of the inner insulation box 8, thereby heating the material in the cavity and making the material reach the temperature required for BMC ag plasticization. At the same time, the double-layer insulation structure of the outer insulation box 7 can reduce heat loss and maintain temperature stability. The spiral heating tube 10's surrounding design makes the inner insulation box 8 heated evenly, avoiding the temperature gradient in the cavity caused by traditional "local heating," such as one side being overheated and the other side being underheated. This ensures that the material is plasticized evenly overall, reduces product performance differences caused by uneven plasticization, and the spiral structure increases the heating area and heat transfer speed, which can shorten the equipment preheating time and improve production preparation efficiency.

[0033] Furthermore, the heater 11 is directly fixed to the outer wall of the inner insulation box 8 by bolts, and is closely adjacent to the spiral heating tube 10, forming a close-range connection structure of "heat source-heating element"; the heat generated by the heater 11 when powered on can be quickly transferred to the spiral heating tube 10 through direct heat conduction, reducing heat loss during the transfer process, such as avoiding heat radiation loss due to long distance, and ensuring efficient heat utilization; at the same time, the heater 11 is fixed to the outer wall of the inner insulation box 8, and can sense the heating demand in real time with the temperature change of the inner insulation box 8, which is convenient for the controller to adjust the power.

[0034] Furthermore, the surface of the feeding section of the single screw 2 is provided with a spiral feeding groove, the depth of which gradually decreases from the feeding end to the compression section. After the raw material falls into the feeding section from the inlet 5, it will fill the feeding groove. Because the initial depth of the feeding groove is large, it can accommodate more raw material and achieve "large flow feeding". As the single screw 2 rotates, the material moves towards the compression section along the spiral trajectory of the feeding groove. The depth of the feeding groove gradually decreases, which can gradually gather the material towards the axis of the single screw 2, preparing for the "compression and compaction" of the subsequent compression section, while avoiding the accumulation and blockage of material in the feeding section.

[0035] Among them, the large initial depth of the feeding trough improves the raw material holding and conveying capacity of the feeding section, solves the problems of slow feeding and easy clogging of traditional single screw, and ensures feeding efficiency for continuous production; The gradual depth design of the feeding trough achieves a smooth transition from "feeding to gathering", avoiding uneven mixing caused by "sudden squeezing" when the material enters the compression section from the feeding section. At the same time, it reduces the impact of the material on the single screw 2 and extends the service life of the equipment. The spiral feeding trough and the pitch of the single screw 2 work together to further improve the uniformity of material conveying, laying the foundation for the dispersion and mixing in the subsequent compression section and the accurate discharge in the metering section, thus ensuring the overall processing quality.

[0036] Furthermore, the inner wall of the inner insulation box 8 is provided with multiple axially extending guide grooves corresponding to the compression section of the single screw 2. When the compression section of the single screw 2 rotates, the dispersing protrusions on its surface radially stir and disperse the material. At the same time, the material flows along the axial direction of the guide groove during the conveying process, forming a compound motion of "radial stirring and dispersing protrusions + axial guide grooves". The guide grooves can break the single trajectory of the material "rotating synchronously with the single screw 2", enhance the contact frequency between the material and the dispersing protrusions, and at the same time avoid the material being excessively squeezed and sheared by the single screw 2 and the inner wall of the inner insulation box 8.

[0037] Among them, the compound motion significantly improves the uniformity of material mixing, solves the problem of poor mixing effect of traditional single screw, ensures that the resin, glass fiber and filler components in BMC briquettes are fully mixed, and improves the consistency of product performance; The shear force on the material dispersed by the guide channel, combined with the dispersion protrusions in the compression section, prevents the glass fiber from being excessively sheared and damaged, effectively preserves the reinforcing effect of the glass fiber, and ensures the mechanical properties of the BMC briquettes. The guide channel guides the material to flow smoothly along the axial direction, avoiding material stagnation in the compression section, ensuring smooth material conveying, and further improving the stability of continuous production.

[0038] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A machine for continuous production of BMC pellets using a single screw, characterized in that: Includes a material bin (1), a drive motor (3) and a circulating liquid pump (4) are installed on one side of the material bin (1), and a discharge port (6) is provided on the other side of the material bin (1). A single screw (2) is installed inside the material bin (1), and the drive motor (3) drives the single screw (2) to rotate. The single screw (2) includes a feeding section, a compression section and a metering section arranged in sequence. The pitch of the feeding section is greater than that of the metering section, and the pitch of the compression section gradually decreases from the end closer to the feeding section to the end closer to the metering section. The compression section of the single screw (2) is provided with multiple dispersed protrusions, which are evenly distributed along the circumference of the single screw (2).

2. The machine equipment for continuous production of BMC pellets using a single screw as described in claim 1, characterized in that: The material box (1) consists of an outer insulation box (7) and an inner insulation box (8). The outer insulation box (7) is fitted onto the outer wall of the inner insulation box (8), and the right outer wall of the inner insulation box (8) is fixedly connected to the right inner wall of the outer insulation box (7).

3. The machine equipment for continuous production of BMC pellets using a single screw as described in claim 2, characterized in that: The output shaft of the drive motor (3) extends into the inner insulation box (8), and the single screw (2) is located inside the inner insulation box (8).

4. The machine equipment for continuous production of BMC pellets using a single screw as described in claim 3, characterized in that: One end of the single screw (2) is fixedly connected to the output shaft of the drive motor (3), and the other end of the single screw (2) is rotatably connected to the inner wall of the inner insulation box (8).

5. The machine equipment for continuous production of BMC pellets using a single screw as described in claim 1, characterized in that: The inlet (5) penetrates the outer insulation box (7) and extends into the inner insulation box (8).

6. The machine equipment for continuous production of BMC pellets using a single screw as described in claim 2, characterized in that: The outer insulation box (7) is equipped with a liquid pipe (9), and both ends of the liquid pipe (9) extend out of the outer insulation box (7) and are connected to the circulating liquid pump (4).

7. The machine equipment for continuous production of BMC pellets using a single screw as described in claim 2, characterized in that: A spiral heating tube (10) is installed around the outer wall of the inner insulation box (8), and a heater (11) is used to heat the spiral heating tube (10).

8. The machine equipment for continuous production of BMC pellets using a single screw as described in claim 7, characterized in that: The heater (11) is fixed on the outer wall of the inner insulation box (8).

9. The machine equipment for continuous production of BMC pellets using a single screw as described in claim 1, characterized in that: The feed section of the single screw (2) is provided with a spiral feeding groove, and the depth of the feeding groove gradually decreases from the feed end to the compression section.

10. The machine equipment for continuous production of BMC pellets using a single screw as described in claim 1, characterized in that: The inner wall of the inner insulation box (8) is provided with multiple axially extending guide grooves corresponding to the position of the compression section of the single screw (2).

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