Material mixing extrusion system based on the rolling action of conical tooth rollers and conical tooth die plates

Abstract

The present invention discloses a material mixing and extrusion system based on the rolling action of bevel-toothed rollers and bevel-toothed die plates. A bevel-toothed die plate with a narrow slit is added to the mixing system, and a bevel-toothed roller group is fixed on the barrel so as to mesh with the bevel-toothed die plate. The screw rotates to drive the bevel-toothed die plate, thereby rotating the bevel-toothed rollers. After the material is plasticized and transported by the screw into the roller die plate area, it first passes through a low-pressure zone with gaps between different rollers in the same group. It is then dragged by the rollers and die plate into a high-pressure zone where the two mesh. In the high-pressure zone, the material is forced to mix and disperse due to the rolling action generated by the meshing, and then extruded from the narrow slit of the die plate. The pressure of the low-pressure zone and the high-pressure zone formed in the extrusion system changes periodically, realizing volume pulsating deformation positive displacement transportation and continuous mixing and dispersion of the material, thereby improving the mixing and dispersion effect of the material.

Description

Technical Field

[0001] The invention relates to the field of material composite system processing, and more particularly to a material mixing extrusion system based on the rolling action of a tapered tooth roller and a tapered tooth die plate. Background Art

[0002] In industrial production and manufacturing, the dispersion and mixing of materials is a crucial process. Many industries, including plastic processing, rubber manufacturing, fiber production, metal powder composite material preparation, and ceramic processing, require the mixing and dispersion of different types of materials to meet product performance and quality requirements. However, the material dispersion and mixing equipment currently available on the market has limitations. For example, traditional mixing equipment can usually only handle specific types of materials and cannot flexibly adapt to diverse production needs. Some mixing equipment can cause problems such as uneven particle size distribution and insufficient mixing when handling specific materials, thereby affecting product quality and performance. In addition, some equipment can only achieve step-by-step mixing of materials and cannot achieve uniform and continuous mixing of materials.

[0003] Chinese invention patent CN112265249A discloses a "polymer plasticizing and transporting method, module, device and equipment based on extrusion and stretching". In the method provided, the volume of the transport space used to transport polymer materials changes periodically from small to large and then from large to small. During the change of the transport space volume from small to large, the polymer material is forced into the transport space. During the change of the transport space volume from large to small, the polymer material is compacted and plasticized under the action of positive stress and then forced out. Thus, the positive displacement transport and plasticizing transport of the polymer material are achieved by relying on the change of the transport space volume. This solution can shorten the thermomechanical process of the plasticizing and transporting process, reduce the energy consumption of plasticizing and transporting, improve the transport efficiency, and reduce the size of the equipment and the space occupied. However, the invention solution has a complex structure and is prone to material accumulation. In addition, since the solution is a local unit, the modification cost is high, and the cost and precision are difficult to control due to the machining of non-standard parts.

[0004] In view of the limitations of the above-mentioned existing material dispersing and mixing equipment, it is necessary to propose a new type of material dispersing and mixing equipment to solve the problems existing in the existing technology and meet diverse production needs. Summary of the Invention

[0005] In order to solve at least one of the problems existing in the prior art, the present invention provides a continuous material mixing and extrusion system based on the rolling action of conical tooth rollers and conical tooth die plates. It is an innovative material dispersion and mixing equipment. Through the rolling action of conical tooth rollers and conical tooth die plates, it can effectively process a variety of materials including plastics, rubber, fibers, metal powder composite materials and ceramic mud embryos, and achieve uniform particle size distribution, thorough mixing and continuous mixing, thereby improving product quality, reducing production costs, and has broad application prospects in related industries.

[0006] In order to achieve the purpose of the present invention, the present invention provides a continuous mixed extrusion system of materials based on the rolling action of conical tooth rollers and conical tooth die plates, wherein at least one conical tooth die plate is added to the screw of the extruder, a narrow slit is provided on the conical tooth die plate, and a conical tooth roller group corresponding to the conical tooth die plate is provided on the barrel wall of the extruder, the conical tooth roller group includes a plurality of conical tooth rollers, each of which is meshed with a corresponding conical tooth die plate, and the conical tooth roller group cooperates with the corresponding conical tooth die plate for transmission, the gap between each conical tooth roller forms a low-pressure area, and the meshing part of the conical tooth roller and the conical tooth die plate forms a high In the pressure zone, when working, during the material conveying process, in the barrel, the conical tooth die plate is fixed on the screw, and its rotational power is provided by the rotation of the screw. The rotational power of the conical tooth roller is provided by the conical tooth die plate. After the material is plasticized and transported by the screw into the roller die plate area, it first passes through the low-pressure area of ​​the gap between the same group of different conical tooth rollers, and then enters the high-pressure area under the dragging action of the conical tooth roller and the conical tooth die plate. In the high-pressure area, it is forced to mix and disperse through the rolling action generated by the meshing, and then squeezed out from the narrow gap of the conical tooth die plate, realizing volume pulsating deformation positive displacement conveying and continuous mixing and dispersion of materials.

[0007] Furthermore, the narrow slits are arranged in the tooth valleys of the conical tooth die plate, and the narrow slits are evenly distributed along the radial direction on the conical tooth die plate, and the material is squeezed out from the narrow slits after being rolled.

[0008] Furthermore, several conical toothed die plates are distributed on the screw, and corresponding sets of conical toothed rollers are installed at corresponding positions on the barrel. The conical toothed die plates and conical toothed rollers work together to drive the material, so that the conical toothed die plates and conical toothed rollers drag and roll it during the plasticization process of the material being conveyed by the screw, achieving more efficient continuous mixing and dispersion.

[0009] Preferably, a plurality of conical tooth die discs are distributed equidistantly on the screw.

[0010] Furthermore, the tooth tops of the bevel-toothed roller correspond to the tooth valleys of the bevel-toothed die plate with a narrow gap. The rolling action formed by the close meshing transmission of the bevel-toothed roller and the bevel-toothed die plate realizes continuous mixing and dispersion of the material, and the material is forced to be squeezed out from the narrow gap to realize positive displacement transportation.

[0011] Furthermore, each bevel gear roller includes a roller body and a roller support seat, the roller support seat is fixed on the barrel, and the roller body is arranged on the roller support seat.

[0012] Furthermore, grooves are provided on the conical surface of the conical tooth roller corresponding to the narrow slits on the conical tooth die plate, so as to facilitate the mixing of materials.

[0013] Furthermore, the application scope of the system includes but is not limited to screw extruders, eccentric rotor extruders and other dispersed mixing systems.

[0014] The screw extruder includes but is not limited to any one of a single-screw extruder, a twin-screw extruder, a triple-screw extruder, and a star-screw extruder.

[0015] When the screw extruder is a twin-screw extruder, both screws of the twin-screw extruder are provided with bevel gear die discs, and the bevel gear die discs on the two screws are arranged alternately, and each bevel gear die disc on each screw cooperates with a corresponding bevel gear roller set.

[0016] Furthermore, when the screw extruder is a twin-screw extruder, bevel gear die discs are provided on both screws of the twin-screw extruder and the bevel gear die discs on the two screws are staggered, and each bevel gear die disc on each screw cooperates with a corresponding bevel gear roller group.

[0017] Furthermore, one side of the bevel gear die plate that matches the bevel gear roller is tapered and tightly meshes with the bevel gear roller that also has a taper, and the other side is perpendicular to the screw.

[0018] Furthermore, the materials processed by the conveying system include but are not limited to any one of plastics, rubber, fiber, metal powder composite materials, and inorganic non-metallic ceramic composite materials.

[0019] Furthermore, the amplitude of the continuous rolling and mixing effect on the material is adjusted by the meshing degree of the conical tooth rollers and the conical tooth die plate, and the frequency of the continuous rolling and mixing effect is adjusted by the speed of the screw or the number of each group of conical tooth rollers distributed on the screw.

[0020] The material first enters the system from the feed port, and after being conveyed by the screw to the roller die area, it first passes through the low-pressure area of ​​the same group of different roller gaps, and then is dragged by the roller die into the high-pressure area where the two mesh for rolling, mixing and dispersion. After being subjected to the periodic pressure change in the roller die area, it is extruded from the narrow gap of the die, forming a volume pulsating deformation positive displacement conveying, and finally extruded from the discharge port.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. Adding conical tooth die plates and conical tooth rollers to the ordinary mixing and dispersing system realizes the alternating periodic changes of materials in low-pressure and high-pressure areas, and strengthens the mass transfer and heat transfer of material transportation. In this process, the material is subjected to periodic fluctuations of stress / strain, thereby achieving the processing effect of continuous rolling mixing and improving the mixing efficiency and dispersion degree.

[0023] 2. Through the cooperation of the conical tooth die plate and the conical tooth roller, the material is squeezed out from the narrow gap after being subjected to multiple rolling actions during the plasticizing and conveying process, which is beneficial to improving the dispersion and mixing effect of the powder and effectively avoiding the occurrence of agglomeration.

[0024] 3. The amplitude of the mixing and rolling effect on the material can be changed by adjusting the screw speed and the tightness of the engagement between the roller die and the roller. The frequency of the volume pulsation effect can be adjusted by the screw speed or the number of rollers distributed around the screw to adapt to different materials and composite systems, thus realizing customized production.

[0025] 4. The material mixing and extrusion system based on the rolling action of the conical tooth roller and the conical tooth die plate has a simple structure and is easy to assemble and disassemble. The roller and die plate structure of the present invention can be used for extruders or other material mixing and dispersion systems at the same time, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0027] Figure 1 Schematic diagram of the application of a material mixing extrusion system based on the rolling action of a conical tooth roller and a conical tooth die plate provided in an embodiment of the present invention on a single-screw extruder.

[0028] Figure 2 Schematic diagram of the application of a material mixing extrusion system based on the rolling action of a conical tooth roller and a conical tooth die plate provided in an embodiment of the present invention on a twin-screw extruder.

[0029] Figure 3 Schematic diagram of the conical tooth roller and the conical tooth die plate of the material mixing extrusion system based on the rolling action of the conical tooth roller and the conical tooth die plate provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] The terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not preclude the presence of additional identical elements in the process, method, commodity, or apparatus that includes the element.

[0032] Example 1

[0033] This embodiment is a continuous material mixing and extrusion system based on the rolling action of a conical tooth roller and a conical tooth die plate used on a single screw extruder.

[0034] like Figure 1 As shown, when a material mixing and extrusion system based on the rolling action of bevel-toothed rollers and bevel-toothed die plates is applied to a single-screw extruder, it includes a screw 1, three sets of equally spaced bevel-toothed rollers, three bevel-toothed die plates 3, a barrel 4, and a medium temperature control system 5. The three bevel-toothed die plates 3 are equally spaced on the screw 1, and the three sets of bevel-toothed rollers correspond to the three bevel-toothed die plates 3 in a one-to-one manner. The bevel-toothed roller sets include a plurality of bevel-toothed rollers 2, each of which is provided with bevel teeth. Each bevel-toothed roller 2 in each bevel-toothed roller set meshes with the corresponding bevel-toothed die plate 3. Because the bevel-toothed rollers in the same set mesh with the same bevel-toothed die plate, each bevel-toothed roller rotates in the same direction. The screw, barrel, and medium temperature control system are inherent structures in existing single-screw extruders and will not be described in detail here. Among them, the bevel-toothed rollers 2 and the bevel-toothed die disk 3 are in high-pair meshing, and the rolling and extrusion effect brought to the material by the remaining non-meshing parts is far less than that of the meshing area, and each group of bevel-toothed rollers 2 is evenly distributed along the circumference of the screw 1, and there are gaps between each of the bevel-toothed rollers 2 to form a low-pressure area, and the meshing part of the bevel-toothed rollers 2 and the bevel-toothed die disk 3 forms a high-pressure area.

[0035] Each of the bevel gear rollers 2 includes a washer, a roller body, a friction reducing ring and a roller support seat. The roller support seat is fixed to the barrel 4 through a hexagonal nut, and the roller body is fixedly arranged on the roller support seat, which is beneficial to improving the stability of the connection and the combination effect.

[0036] The bevel-toothed rollers 2 mesh with the bevel-toothed die disc 3, and the extruder's screw 1 rotates, thereby driving the bevel-toothed die disc 3 to rotate, causing the bevel-toothed rollers 2 to rotate. After being plasticized and transported by the screw 1 into the roller die area, the material first passes through the low-pressure zone between the gaps between different bevel-toothed rollers in the same group. It is then dragged by the bevel-toothed rollers 2 and the bevel-toothed die disc 3 into the high-pressure zone where the two mesh. In this high-pressure zone, the material is forcibly mixed and dispersed by the rolling action generated by the meshing, and then extruded from the narrow gap of the bevel-toothed die disc 3. The bevel-toothed rollers 3 and the bevel-toothed die disc 2 are in high-pair meshing, and the rolling and extrusion effect on the material in the remaining non-meshing areas is far less than that in the meshing areas. Each group of bevel-toothed rollers 3 is evenly distributed along the circumference of the screw, with gaps between the rollers forming low-pressure zones, and the meshing areas between the rollers and the die disc forming high-pressure zones.

[0037] During the entire process of the material being dragged into the roller die area, the flow rate of the melt will flow along the movement direction of the bevel gear roller 2 and the bevel gear die 3, and due to pressure changes, eddy currents and backflows will occur before entering the meshing area and after exiting the meshing area. Finally, part of the melt is squeezed out from the narrow gap of the bevel gear die 3 into the next screw area, and the rest enters the next roller die area of ​​the same group.

[0038] The single-screw extruder in this embodiment is equipped with three equally spaced conical-tooth roller groups and corresponding conical-tooth die plates 3 with narrow slits. Each roller group includes four conical-tooth rollers 2, which are evenly distributed circumferentially on the wall of the barrel 4. The bottom of the rollers engages with the conical-tooth die plate 3, and the material is subjected to alternating periodic changes in the pressure of the low-pressure and high-pressure zones.

[0039] In the above structure, after the power is provided to the screw 1 by the motor, the screw 1 rotates to convey the material while driving the bevel die plate 3 fixed thereon to rotate, and then drives the corresponding meshing bevel roller 2 to rotate, thereby achieving the effect of improving the plasticizing efficiency and plasticizing degree.

[0040] The amplitude of the continuous rolling and mixing action on the material can be adjusted by the degree of engagement between the conical tooth roller 2 and the conical tooth die plate 3, and the frequency of the continuous rolling and mixing action can be adjusted by the rotation speed of the screw 1 or the number of each group of rollers distributed on the screw, so as to adapt to different material composite systems and realize customized production.

[0041] In this embodiment, after the material enters the extruder at the feed port, it is transported by the screw 1 through three groups of roller die areas in sequence. Each group of roller die areas repeatedly passes through the high-pressure and low-pressure areas and is extruded from the narrow gap of the conical tooth die 3, realizing positive displacement transportation and entering the next area.

[0042] The materials processed by the material mixing and extrusion system include but are not limited to plastics, rubber, fibers, metal powder composite materials, inorganic non-metallic ceramic composite materials, etc.

[0043] Example 2

[0044] This embodiment is a material mixing and extrusion system based on the rolling action of bevel-toothed rollers and bevel-toothed die plates, used on a twin-screw extruder. The system includes a twin screw 1, a main material metering system 2, a medium temperature control system 3, bevel-toothed rollers 4, a supplementary material metering system 5, a bevel-toothed die plate 6, a devolatilization system 7, and a barrel 8. The twin screw 1, main material metering system 2, medium temperature control system 3, supplementary material metering system 5, devolatilization system 7, and barrel 8 are all original components of a twin-screw extruder and are not described in detail here.

[0045] Compared with Example 1, the difference is that Figure 2 As shown, the extruder screw is changed into a twin screw, and the conical tooth die plate 6 on the screw is also changed from a single one in Example 1 to a staggered arrangement in pairs, and the arrangement of the conical tooth rollers 4 is changed from a uniform annular arrangement around the single screw to three conical tooth rollers respectively arranged on the two screws.

[0046] When in use, the continuous mixing and extrusion system of the materials by the rolling action of the conical tooth roller 4 and the conical tooth die plate 6 plasticizes and melts the material, and transports it to the narrow gap die plate area of ​​the roller along with the twin screws. At the same time, the conical tooth die plate rotates with the screw and drives the conical tooth roller to rotate, thereby realizing the mixing, dispersion and processing plasticization of the material.

[0047] Example 3

[0048] This embodiment is an application of a material mixing extrusion system based on the rolling action of a conical tooth roller and a conical tooth die plate on an eccentric rotor extruder.

[0049] Compared with Example 1 and Example 2, the difference is that the extruder is replaced by an eccentric rotor extruder instead of an ordinary screw extruder, and the volume tensile deformation of the eccentric rotor extruder is combined with the rolling and mixing action of the narrow slit die of the roller, thereby enhancing the mass transfer, heat transfer and mixing effects of the material.

[0050] As described above, the present invention can be better implemented. The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made based on the content of the present invention are covered by the scope of protection required by the claims of the present invention.

Claims

1. A material mixing extrusion system based on the rolling action of a conical tooth roller and a conical tooth die plate, characterized in that: At least one conical tooth die plate is added to the screw of the extruder, and a narrow gap is set on the conical tooth die plate. A conical tooth roller group corresponding to the conical tooth die plate is set on the barrel wall of the extruder. The conical tooth roller group includes multiple conical tooth rollers, each of which is meshed with the corresponding conical tooth die plate. The gap between each conical tooth roller forms a low-pressure area, and the meshing part of the conical tooth roller and the conical tooth die plate forms a high-pressure area. When working, after the material is plasticized and transported by the screw into the roller die plate area, it first passes through the low-pressure area of ​​the gap between different conical tooth rollers in the same group, and then is subjected to the conical tooth roller and the conical tooth die plate. The material is dragged into the high-pressure area by the rolling action generated by the meshing, and is forced to mix and disperse in the high-pressure area, and then squeezed out from the narrow gap of the conical tooth die plate, realizing volume pulsating deformation positive displacement transportation and continuous mixing and dispersion of the material; a number of conical tooth die plates and a number of groups of conical tooth rollers are evenly distributed on the screw to enhance the rolling, mixing and dispersion effect; the amplitude of the continuous rolling and mixing effect on the material is adjusted by the meshing degree of the conical tooth rollers and the conical tooth die plates, and the frequency of the continuous rolling and mixing effect is adjusted by the screw speed or the number of each group of conical tooth rollers distributed on the screw.

2. The material mixing extrusion system based on the rolling action of the conical tooth roller and the conical tooth die plate according to claim 1 is characterized in that: The narrow slits are set in the tooth valleys of the conical tooth die plate, and the narrow slits are evenly distributed along the radial direction of the conical tooth die plate. The material is squeezed out from the narrow slits after being rolled.

3. The material mixing extrusion system based on the rolling action of the conical tooth roller and the conical tooth die plate according to claim 1 is characterized in that: The tooth tops of the conical tooth rollers correspond to the tooth valleys of the conical tooth die plates with narrow slits. The rolling action formed by the close meshing transmission between the conical tooth rollers and the conical tooth die plates realizes continuous mixing and dispersion of the materials, and forces the materials to be squeezed out from the narrow slits to realize positive displacement conveying.

4. The material mixing extrusion system based on the rolling action of the conical tooth roller and the conical tooth die plate according to claim 1 is characterized in that: Each bevel gear roller comprises a roller body and a roller support seat. The roller support seat is fixed on the barrel, and the roller body is arranged on the roller support seat.

5. The material mixing extrusion system based on the rolling action of the conical tooth roller and the conical tooth die plate according to claim 1, characterized in that: The bevel gear roller is provided with grooves corresponding to the narrow slits on the bevel gear die plate.

6. The material mixing extrusion system based on the rolling action of the conical tooth roller and the conical tooth die plate according to claim 1, characterized in that: The system is applicable to screw extruders, eccentric rotor extruders or other dispersive mixing systems.

7. The material mixing extrusion system based on the rolling action of the conical tooth roller and the conical tooth die plate according to claim 1, characterized in that: The extruder includes any one of a single-screw extruder, a twin-screw extruder, a triple-screw extruder, and a star-screw extruder.

8. The material mixing extrusion system based on the rolling action of the conical tooth roller and the conical tooth die plate according to claim 1, characterized in that: The materials processed by the conveying system include any one of plastics, rubber, fiber, metal powder composite materials, and inorganic non-metallic ceramic composite materials.

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