Counter-direction differential screw kneading device, continuous kneading machine, and material preparation system

Abstract

The present disclosure relates to a counter-direction differential screw kneading device, a continuous kneading machine, and a material preparation system. A screw mechanism comprises a central screw and a peripheral screw which are in a counter-direction differential fit. Central blades of the central screw are each provided with a central blade concave surface on the side facing a peripheral blade and along the direction of rotation of the central blade. Peripheral blades of the peripheral screw are each provided with a peripheral blade convex surface on the side facing a central blade and along the direction of rotation of the peripheral blade. The central blade concave surface and the peripheral blade convex surface are in an enveloping fit. Each of the central blade concave surface and the peripheral blade convex surface is provided with a material kneading section. There is a kneading gap e between the material kneading sections of the two surfaces. From the start to the end of engagement of the material kneading sections of the two surfaces, the kneading gap e remains constant. In the present disclosure, when the material kneading sections of the central screw and the peripheral screw perform kneading on the material in an enveloping manner, the kneading gap e remains constant, ensuring forward conveyance of the material while enabling the material to be thoroughly kneaded and mixed, thereby improving the mixing effect of the material.

Description

Differential screw kneading device, continuous kneader, material preparation system

[0001] This disclosure claims priority to Chinese Patent Application No. 2024106899594, filed on May 30, 2024, entitled “Anti-directional Differential Screw Kneading Device, Continuous Kneader, Material Production System”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of material mixing and dispersion technology, and in particular to an anisotropic differential speed screw kneading device, a continuous kneader, and a material preparation system for material mixing and dispersion. Background Technology

[0003] In industries such as petroleum, chemical, rubber, plastics, pharmaceuticals, and food, mixing, shearing, and plasticizing of high-viscosity fluids are frequently involved. Extruders and kneaders are important pieces of equipment for mixing, shearing, and plasticizing high-viscosity fluids.

[0004] Chinese invention patent 202010216298.5 discloses an anti-directional differential rotary extrusion device. A screw mechanism is installed inside the barrel, comprising a first screw and a second screw. The first and second screws rotate in opposite directions at a fixed speed ratio. The top and bottom diameters of the first screw are always meshed with the bottom and top diameters of the second screw, respectively. At least one first intermediate arc structure is provided between the bottom and top diameters of the first screw, and a second intermediate arc structure, always tangent to the first intermediate arc structure, is provided between the bottom and top diameters of the second screw. Through the first and second intermediate arc structures of the first and second screws, the screw grooves of the two screws are opened to each other, expanding the original closed C-type positive displacement conveying unit into an "8"-type positive displacement conveying unit, thus increasing the mixing effect. In this type of anisotropic differential speed extrusion device, the screw mechanism achieves material mixing and conveying through the meshing of the axial helical blades of the first and second screws. However, the contact area of ​​the mixing region between the helical blades of the two screws is small, resulting in poor mixing. Although the first and second screws expand the original closed C-type chamber positive displacement conveying unit into an "8"-type chamber positive displacement conveying unit through a first intermediate arc structure and a second intermediate arc structure tangent to it, thereby increasing the contact area of ​​the mixing region, there is still an axially closed structure in the screw mechanism. In other words, the mixing region of the positive displacement conveying unit between the first and second screws is not fully continuous along the axial direction, but is divided into several mixing sub-regions by the axially closed structure of the screw groove. Moreover, the material in the mixing sub-regions is still mixed and conveyed through the meshing of the helical blades. Therefore, the contact area of ​​the mixing sub-regions is still relatively small, and the material mixing effect is still not ideal. Summary of the Invention

[0005] In response to the shortcomings of existing counter-rotating differential speed extrusion devices, the applicant provides a structurally sound counter-rotating differential speed screw kneading device, continuous kneader, and material preparation system. The screw assembly is equipped with several conveying units and kneading units, increasing the contact area of ​​the mixing zone and improving the material mixing effect.

[0006] To solve the above-mentioned technical problems, the technical solution adopted in this disclosure is as follows:

[0007] This disclosure provides a counter-rotating differential speed screw kneading device, including a screw mechanism. The screw mechanism includes a central screw and peripheral screws that are counter-rotating differentially engaged. The central screw has a central radial cross-section with a plurality of central blades, and the peripheral screws have a peripheral radial cross-section with a plurality of peripheral blades. A concave central blade is provided on the side of the central blades facing the peripheral blades along their rotation direction; a convex peripheral blade is provided on the side of the peripheral blades facing the central blades along their rotation direction. The concave central blade and the convex peripheral blades are in overlapping engagement. Material kneading sections are provided on the concave central blade and the convex peripheral blades, and a kneading gap e is provided between the two material kneading sections from the start of engagement to the end of engagement. e is equal; the concave surface of the central blade is provided with a first concave section and a second concave section, and the convex surface of the peripheral blade is provided with a convex section and a third concave section. The first concave section and the convex section are material kneading sections; the ratio of the arc length L1 of the first concave section to the arc length L2 of the convex section is: L1 / L2=n1 / n2; the central blade includes the central blade tip diameter and the central blade root diameter, and the peripheral blade includes the peripheral blade tip diameter and the peripheral blade root diameter; the diameter D1 of the central blade tip diameter is equal to the diameter D2 of the peripheral blade tip diameter, and the diameter d1 of the central blade root diameter is equal to the diameter d2 of the peripheral blade root diameter; there is a meshing gap c between the central blade root diameter of the central blade and the peripheral blade tip diameter of the peripheral blade, c=b-(d1+D2) / 2=b-(D1+d2) / 2.

[0008] In one embodiment, the kneading gap e is 0.1mm-10mm.

[0009] In one embodiment, the meshing clearance c is 0.5 mm to 20 mm.

[0010] In one embodiment, the number of central blades is greater than or equal to the number of peripheral blades, and the number of central blades is an integer multiple of the number of peripheral blades.

[0011] In one embodiment, a plurality of central blades extend outward from the central screw along its rotation direction toward the peripheral screw to form a plurality of peripheral blades extending outward from the peripheral screw along its rotation direction toward the central screw to form a plurality of peripheral blades, the rotation direction of the peripheral blades being opposite to that of the central blades.

[0012] In one embodiment, the screw mechanism is provided with a plurality of conveying areas and a plurality of kneading areas along the screw axis; the conveying areas and kneading areas are arranged at intervals; the central screw and the peripheral screw are provided with a plurality of conveying units corresponding to the plurality of conveying areas and a plurality of kneading units corresponding to the plurality of kneading areas; the conveying units of the central screw and the peripheral screw are engaged by helical blades, and the kneading units are engaged by kneading blades.

[0013] In one embodiment, the conveying unit of the central screw and the peripheral screw is generated by helically twisting a radial cross section containing a plurality of blades along the axial direction, and the conveying unit forms a plurality of helical blades on the screw.

[0014] In one embodiment, the kneading unit of the central screw and the peripheral screw is generated by stacking several kneading blades with a radial cross-section containing several blades along the axial direction and rotating them in sequence at a certain angle in the circumferential direction; from the feed end to the discharge end, the angle deflection direction of the kneading blades is opposite to the rotation direction of its screw.

[0015] In one embodiment, the ratio of the deflection angle α of the central kneading blade of the central kneading unit to the deflection angle β of the peripheral kneading blade of the peripheral kneading unit is: α / β = n1 / n2.

[0016] In one embodiment, the conveying area includes a feeding conveying area, an intermediate conveying area, and a discharging conveying area, with several intermediate conveying areas and several kneading areas arranged at intervals; a first conveying unit, a second conveying unit, and a third conveying unit are arranged on the central screw and the peripheral screws, the spiral direction of the first conveying unit is the same as the spiral direction of the second conveying unit, and the spiral direction of the third conveying unit is opposite to the spiral directions of the first and second conveying units; a first output unit is arranged in the feeding conveying area, a second conveying unit is arranged in the intermediate conveying area, and a third conveying unit is arranged in the intermediate conveying area and / or the discharging conveying area.

[0017] In one embodiment, the axial length L1 of the first conveying unit is greater than the axial length L2 of the second conveying unit, L1 = (2~50)L2; the axial length L2 of the second conveying unit is equal to the axial length L4 of the third conveying unit; the axial length L3 of the kneading unit is greater than or equal to the axial length L2 of the second conveying unit, L3 = (1.0~2.5)L2.

[0018] In one embodiment, at least one peripheral screw is engaged with the outer periphery of the central screw.

[0019] This disclosure also provides a continuous kneader, including the opposite-direction differential screw kneading device as described above. The screw mechanism is disposed in the mixing cylinder, and one end of the screw mechanism is connected to the drive device. The mixing cylinder is provided with at least one powder inlet, several liquid inlets, and several discharge outlets. The powder inlet is disposed on one side of the feeding conveying area of ​​the screw mechanism, and the upper discharge outlet and the lower discharge outlet are disposed on one side of the discharge conveying area of ​​the screw mechanism. The mixing cylinder and the drive device are disposed on the frame.

[0020] This disclosure also provides a material preparation system, including the continuous kneader as described above; it also includes a powder batching system, a liquid batching system, and several slurry dispersion systems, wherein the powder batching system is connected to the powder inlet of the kneader, the liquid batching system is connected to the liquid inlet of the kneader, and the discharge port of the kneader is connected to the slurry dispersion system.

[0021] In one embodiment, the powder batching system includes several powder silos and buffer silos. The powder silos are connected to the buffer silos via pipelines, and the buffer silos are connected to the powder inlet of the kneader via pipelines. The liquid batching system includes several liquid tanks. Some of the liquid tanks are connected to the liquid inlet of the kneader via pipelines, and some of the liquid tanks are connected to the slurry dispersion system via pipelines. The slurry dispersion system includes a slurry tank, and a stirrer is installed inside the slurry tank.

[0022] This disclosure also provides a counter-rotating differential screw kneading device, including a screw mechanism. The screw mechanism includes a central screw and peripheral screws that are counter-rotating differentially engaged. The central radial cross-section of the central screw includes a plurality of central blades, and the peripheral radial cross-section of the peripheral screw includes a plurality of peripheral blades. The central blades have a concave central blade surface on the side facing the peripheral blades along their rotation direction. The peripheral blades have a convex peripheral blade surface on the side facing the central blades along their rotation direction. The concave central blade surface and the convex peripheral blade surface are in an envelope engagement. The concave central blade surface and the convex peripheral blade surface have material kneading sections, and there is a kneading gap e between the two material kneading sections. The kneading gap e is equal from the start of engagement to the end of engagement.

[0023] In one embodiment, the concave surface of the central leaf is provided with a first concave section and a second concave section, and the convex surface of the peripheral leaf is provided with a convex section and a third concave section, wherein the first concave section and the convex section are material kneading sections.

[0024] In one embodiment, the ratio of the arc length L1 of the first concave segment to the arc length L2 of the convex segment is: L1 / L2 = n1 / n2.

[0025] In one embodiment, the central blade includes a central blade tip diameter and a central blade root diameter, and the peripheral blade includes a peripheral blade tip diameter and a peripheral blade root diameter; the diameter D1 of the central blade tip diameter is equal to the diameter D2 of the peripheral blade tip diameter, and the diameter d1 of the central blade root diameter is equal to the diameter d2 of the peripheral blade root diameter.

[0026] In one embodiment, there is a meshing gap c between the central root diameter of the central blade and the peripheral tip diameter of the peripheral blade, where c = b - (d1 + D2) / 2 = b - (D1 + d2) / 2; the meshing gap c is 0.5 mm - 20 mm.

[0027] The beneficial effects of this disclosure are as follows:

[0028] The material kneading sections of the central screw and peripheral screws of this disclosure maintain a constant kneading gap e when enveloping and kneading the material, ensuring the forward conveying of the material while also ensuring that the material is fully kneaded and mixed, thereby improving the mixing effect of the material.

[0029] The central screw of this disclosure has a meshing gap c between its top / root diameter and the root / top diameter of the peripheral screws, which makes the mixing area between the central screw and the peripheral screws fully continuous along the axial direction, greatly increasing the contact area of ​​the mixing area, thereby greatly improving the mixing effect of the material and enhancing the mixing capacity of the material. Under the same mixing requirements, the overall length of the screw can be greatly shortened, the structure of the screw mechanism can be simplified, and the wear of the screw can be reduced.

[0030] The screw mechanism disclosed herein features a plurality of conveying units and kneading units spaced axially along the screw. In the conveying zone, the central screw and peripheral screws continuously disperse and mix the material through the meshing of the helical blades of the conveying units, thus improving the positive displacement conveying capacity and ensuring the forward conveying efficiency of the material. In the kneading zone, the central screw and peripheral screws continuously knead the material through the meshing of the kneading blades, resulting in more thorough mixing and enhancing the mixing effect and capacity. During the mixing and conveying process, the material continuously undergoes alternating dispersion mixing and kneading mixing, which, while ensuring material conveying efficiency, also increases the contact area for material mixing and improves the mixing effect.

[0031] The first conveying unit of this disclosure has a longer axial length, which is beneficial for improving the positive displacement conveying capacity of the feed and facilitating the forward conveying of materials. The axial length of the kneading unit is greater than or equal to the axial length of the second conveying unit, resulting in a longer kneading path, a longer material residence time in the kneading unit, and a better kneading effect. Attached Figure Description

[0032] Figure 1 is a three-dimensional structural diagram of the first embodiment of the screw mechanism disclosed herein.

[0033] Figure 2 is a top view of the first embodiment of the screw mechanism disclosed herein.

[0034] Figure 3 is a schematic diagram of the radial cross-section of the first embodiment of the screw mechanism disclosed herein.

[0035] Figure 4 is a schematic diagram of the central conveying unit of the central screw.

[0036] Figure 5 is a schematic diagram of the central kneading unit of the central screw.

[0037] Figure 6 is a left view of the central kneading unit of the central screw.

[0038] Figure 7 is a schematic diagram of the peripheral conveying unit of the peripheral screw.

[0039] Figure 8 is a schematic diagram of the peripheral kneading unit of the peripheral screw.

[0040] Figure 9 is a left view of the peripheral kneading unit of the peripheral screw.

[0041] Figure 10 is a schematic diagram of the radial cross-section of the second embodiment of the screw mechanism disclosed herein.

[0042] Figure 11 is a schematic diagram of the radial cross-section of the third embodiment of the screw mechanism of this disclosure.

[0043] Figure 12 is a schematic diagram of the radial cross-section of the fourth embodiment of the screw mechanism of this disclosure.

[0044] Figure 13 is a front view of the kneader.

[0045] Figure 14 is a top view of the kneader's structure.

[0046] Figure 15 is a schematic diagram of the material production system.

[0047] In the diagram: 100, screw mechanism; 101, feeding conveying area; 102, intermediate conveying area; 103, kneading area; 104, discharging conveying area;

[0048] 1. Central screw; 10. Central radial cross section; 11. Central conveying unit; 111. Central first conveying unit; 112. Central second conveying unit; 113. Central third conveying unit; 12. Central kneading unit; 13. Central blade; 131. Central blade tip diameter; 132. Central blade root diameter; 133. Central blade concave surface; 1331. First concave section; 1332. Second concave section; 14. Central helical blade; 15. Central kneading blade;

[0049] 2. Peripheral screw; 20. Peripheral radial cross section; 21. Peripheral conveying unit; 211. Peripheral first conveying unit; 212. Peripheral second conveying unit; 213. Peripheral third conveying unit; 22. Peripheral kneading unit; 23. Peripheral blade; 231. Peripheral blade tip diameter; 232. Peripheral blade root diameter; 233. Peripheral blade convex surface; 2331. Convex section; 2332. Third concave section; 24. Peripheral spiral blade; 25. Peripheral kneading blade;

[0050] 200. Kneader; 201. Frame; 202. Mixing cylinder; 203. Drive unit; 204. Powder inlet; 205. First liquid inlet; 206. Second liquid inlet; 207. Upper discharge port; 208. Lower discharge port;

[0051] 300. Powder batching system; 301. Powder silo; 302. Buffer silo;

[0052] 400. Liquid dispensing system; 401. Liquid tank;

[0053] 500, Slurry dispersion system; 501, Slurry tank; 502, Agitator. Detailed Implementation

[0054] The specific embodiments of this disclosure are described below with reference to the accompanying drawings.

[0055] First embodiment of screw mechanism 100:

[0056] As shown in Figures 1 and 2, the screw mechanism 100 of this disclosure includes a central screw 1 and a peripheral screw 2 with opposite helical directions and differential speeds. The screw mechanism 100 is provided with a feeding conveying area 101, several intermediate conveying areas 102, several kneading areas 103, and a discharging conveying area 104 along the screw axis. The several intermediate conveying areas 102 and several kneading areas 103 are arranged alternately. The central screw 1 is provided with several central conveying units 11 and several central kneading units 12 for each area, and the peripheral screw 2 is also provided with several peripheral conveying units 21 and several peripheral kneading units 22 for each area. The central conveying units 11 and peripheral conveying units 21 are meshed with each other in the conveying area to continuously disperse and mix the powder and liquid and convey them forward. The central kneading units 12 cooperate with the peripheral kneading units 22 to continuously knead and mix the powder and liquid and convey them forward.

[0057] The central conveying unit 11 of the central screw 1 includes a central first conveying unit 111, several central second conveying units 112, and a central third conveying unit 113. The central first conveying unit 111 is located in the feeding conveying area 101, the central second conveying units 112 are located in the intermediate conveying area 102, the central third conveying unit 113 is located in the discharging conveying area 104, and the central kneading unit 12 is located in the kneading area 103. The peripheral conveying unit 21 of the peripheral screw 2 includes a peripheral first conveying unit 211, several peripheral second conveying units 212, and a peripheral third conveying unit 213. The peripheral first conveying unit 211 is located in the feeding conveying area 101, the peripheral second conveying units 212 are located in the intermediate conveying area 102, the peripheral third conveying units 213 are located in the discharging conveying area 104, and the peripheral kneading unit 22 is located in the kneading area 103. The screw mechanism 100 has several conveying units and kneading units spaced apart along the axial direction on the screw. During the mixing and conveying process, the material continuously undergoes dispersion mixing and kneading mixing alternately. While ensuring the material conveying efficiency, it also increases the contact area of ​​material mixing and improves the mixing effect of the material.

[0058] As shown in Figure 2, the spiral direction of the first conveying unit (located in the feeding conveying area 101) of the central screw 1 / peripheral screw 2 is the same as that of the second conveying unit (located in the intermediate conveying area 102). The spiral direction of the third conveying unit (located in the discharge conveying area 104) is opposite to that of the first and second conveying units. The discharge conveying area 104 of the screw is equipped with a third conveying unit with the opposite spiral direction. After the material enters the third conveying unit, it will change direction, which helps to reduce the sealing pressure at the discharge end and improve the sealing life. In other embodiments, a third conveying unit with the opposite spiral direction can also be set in the intermediate conveying area 102, which can prolong the residence time of the material in the conveying area, prolong the mixing time, and improve the mixing effect of the material. The axial length L1 of the first conveying unit is greater than the axial length L2 of the second conveying unit, L1 = (2~50)L2. The axial length of the first conveying unit located in the feeding conveying area 101 is set to be longer, which is beneficial to improving the positive displacement conveying capacity of the feed and facilitating the forward conveying of the material. The axial length L2 of the second conveying unit is equal to the axial length L4 of the third conveying unit. The axial length L3 of the kneading unit is greater than or equal to the axial length L2 of the second conveying unit. L3 = (1.0~2.5)L2. The kneading path is longer, the material stays in the kneading unit for a longer time, and the kneading effect is better.

[0059] The rotational speed n1 of the central screw 1 is less than or equal to the rotational speed n2 of the peripheral screw 2, n2 / n1 ≥ 1, and the rotational speed n2 is an integer multiple of the rotational speed n1, which facilitates the machining and manufacturing of the screws. The ratio of the pitch S1 of the central screw 1 to the pitch S2 of the peripheral screw 2 is: S1 / S2 = n1 / n2.

[0060] As shown in Figure 3, the central radial cross section 10 of the central screw 1 includes a plurality of central blades 13, and the peripheral radial cross section 20 of the peripheral screw 2 includes a plurality of peripheral blades 23. The number of central blades 13 and the number of peripheral blades 23 can be equal, and the number of central blades 13 can also be an integer multiple of the number of peripheral blades 23. In this embodiment, there are four central blades 13 and two peripheral blades 23. The central blade 13 includes a central tip diameter 131 and a central root diameter 132, and the peripheral blade 23 includes a peripheral tip diameter 231 and a peripheral root diameter 232. The diameter D1 of the central tip diameter 131 is equal to the diameter D2 of the peripheral tip diameter 231, and the diameter d1 of the central root diameter 132 is equal to the diameter d2 of the peripheral root diameter 232. The distance b between the center point O1 of the central screw 1 and the center point O2 of the peripheral screw 2 is greater than (d1+D2) / 2 or greater than (D1+d2) / 2, that is, there is a meshing clearance c between the central root diameter 132 of the central blade 13 and the peripheral tip diameter 231 of the peripheral blade 23, and there is also a meshing clearance c between the central tip diameter 131 of the central blade 13 and the peripheral root diameter 232 of the peripheral blade 23. c=b-(d1+D2) / 2=b-(D1+d2) / 2, and the meshing clearance c is 0.5mm-20mm. A meshing gap c is provided between the top diameter / root diameter of the central screw 1 and the root diameter / top diameter of the peripheral screw 2, so that the mixing area between the central screw 1 and the peripheral screw 2 is fully connected along the axial direction, which greatly increases the contact area of ​​the mixing area, thereby greatly improving the mixing effect of the material and enhancing the mixing capacity of the material. Under the same mixing requirements, the overall length of the screw can be greatly shortened, simplifying the structure of the screw mechanism 100 and reducing the wear of the screw.

[0061] A plurality of central blades 13 extend outward from the central screw 1 along its rotational direction toward the peripheral screw 2. The peripheral screw 2 extends outward from the central screw 1 along its rotational direction, with the peripheral blades 23 rotating in the opposite direction to the central blades 13. A central blade concave surface 133 is provided on the side of the central blade 13 facing the peripheral blades 23 along its rotational direction. The central blade concave surface 133 includes an outer first concave section 1331 and an inner second concave section 1332. Referring to Figure 3, the AB curve segment is the first concave section 1331, and the BC curve segment is the second concave section 1332. The peripheral blade 23 is provided with a peripheral blade convex surface 233 on the side facing the central blade 13 along its rotation direction. The peripheral blade convex surface 233 includes an outer convex surface segment 2331 and an inner third concave surface segment 2332. Referring to Figure 3, the DE curve segment is the convex surface segment 2331 and the EF curve segment is the third concave surface segment 2332. The first concave section 1331 of the central blade 13 and the convex section 2331 of the peripheral blade 23 serve as material kneading sections, working together to knead the material. The ratio of the arc length L1 of the first concave section 1331 to the arc length L2 of the convex section 2331 is: L1 / L2=n1 / n2. There is a gap between the first concave section 1331 and the convex section 2331, forming a kneading gap e, which is 0.1mm-10mm. From the start of engagement (when the two enter the envelope engagement) to the end of engagement (when the two leave the envelope engagement), the kneading gap e between the two is equal. That is, when the first concave section 1331 and the convex section 2331 envelop and knead the material, the kneading gap e remains unchanged, ensuring the forward conveying of the material while also ensuring that the material is fully kneaded and mixed, thus improving the mixing effect of the material.

[0062] As shown in Figure 4, the central conveying unit 11 of the central screw 1 is generated by the central radial cross section 10 spirally twisting along the axial direction with a pitch S1. Several central spiral blades 14 are formed on the central screw 1, corresponding to several central blades 13. From the feed end to the discharge end, the spiral twisting direction of the central first conveying unit 111 and the central second conveying unit 112 is opposite to the rotation direction of the central screw 1, while the spiral twisting direction of the central third conveying unit 113 is the same as the rotation direction of the central screw 1. As shown in Figures 5 and 6, the central kneading unit 12 of the central screw 1 is generated by several central kneading blades 15 with a cross section shape of central radial cross section 10, which are stacked along the axial direction and are generated by rotating circumferentially by a certain angle α from the feed end to the discharge end. The included angle (central blade deflection angle α) between the center lines of two adjacent central kneading blades 15 is equal. From the feed end to the discharge end, the angle deflection direction of the central kneading blades 15 is opposite to the rotation direction of the central screw 1.

[0063] As shown in Figure 7, the peripheral conveying unit 21 of the peripheral screw 2 is generated by the axial spiral twisting of the peripheral radial cross section 20 with a pitch S2. On the peripheral screw 2, a number of peripheral spiral blades 24 are formed corresponding to the peripheral blades 23. From the feed end to the discharge end, the spiral twisting direction of the first peripheral conveying unit 211 and the second peripheral conveying unit 212 is opposite to the rotation direction of the peripheral screw 2, while the spiral twisting direction of the third peripheral conveying unit 213 is the same as the rotation direction of the peripheral screw 2. As shown in Figures 8 and 9, the peripheral kneading unit 22 of the peripheral screw 2 is generated by the axial stacking of a number of peripheral kneading blades 25 with a cross section shape of peripheral radial cross section 20. From the feed end to the discharge end, they are generated by rotating circumferentially by a certain angle β. That is, the included angle (peripheral blade deflection angle β) between the center lines of two adjacent peripheral kneading blades 25 is equal. From the feed end to the discharge end, the angular deflection direction of the peripheral kneading blades 25 is opposite to the rotation direction of the peripheral screw 2. The ratio of the deflection angle α of the central kneading blade 15 of the central kneading unit 12 to the deflection angle β of the peripheral kneading blade 25 of the peripheral kneading unit 22 is: α / β = n1 / n2.

[0064] As shown in Figures 1 and 2, in the conveying zones (feed conveying zone 101, intermediate conveying zone 102, and discharge conveying zone 104), the central screw 1 and the peripheral screw 2 continuously rub, disperse, mix, and forward-feed the material through the meshing of the spiral blades of the conveying unit, improving the positive displacement conveying capacity and ensuring the positive conveying efficiency of the material. In the kneading zone 103, the central screw 1 and the peripheral screw 2 continuously knead the material through the meshing of the kneading blades, making the material more thoroughly mixed, increasing the mixing effect, and improving the mixing capacity.

[0065] Second embodiment of screw mechanism 100:

[0066] As shown in Figure 10, unlike the first embodiment, the screw mechanism 100 in this embodiment includes a central screw 1 and two peripheral screws 2 that are coupled in opposite directions and at different speeds. The three screws are arranged in a straight line, with the two peripheral screws 2 located on the left and right sides of the central screw 1. The three-screw screw mechanism 100 has better mixing effect and output, and higher efficiency.

[0067] Third embodiment of screw mechanism 100:

[0068] As shown in Figure 11, unlike the second embodiment, the screw mechanism 100 in this embodiment includes a central screw 1 and four peripheral screws 2 that are coupled in opposite directions and at different speeds. The five screws are arranged in a cross shape, and the four peripheral screws 2 are located to the left, right, top, and bottom of the central screw 1. The multi-screw screw mechanism 100 further improves the mixing effect, output, and efficiency.

[0069] Fourth embodiment of screw mechanism 100:

[0070] As shown in Figure 12, unlike the first embodiment, in this embodiment, the number of central blades 13 on the central screw 1 is equal to the number of peripheral blades 23 on the peripheral screw 2, both being two. The central screw 1 and the peripheral screw 2 have the same number of blades, resulting in a simpler structure and easier assembly.

[0071] Example of kneading machine 200:

[0072] As shown in Figures 13 and 14, a mixing cylinder 202 and a drive device 203 are mounted on the frame 201 of the kneader 200. The aforementioned screw mechanism 100 is disposed inside the mixing cylinder 202, and one end of the screw mechanism 100 is connected to the drive device 203. The mixing cylinder 202 is provided with at least one powder inlet 204, several liquid inlets, and several discharge outlets. In this embodiment, the mixing cylinder 202 is provided with a first liquid inlet 205 and a second liquid inlet 206, an upper discharge outlet 207, and a lower discharge outlet 208. The powder inlet 204 is located on one side of the feeding conveying area 101 of the screw mechanism 100, and the upper discharge outlet 207 and the lower discharge outlet 208 are located on one side of the discharge conveying area 104 of the screw mechanism 100.

[0073] Example of a material production system:

[0074] As shown in Figure 15, the material preparation system includes the aforementioned kneader 200, powder batching system 300, liquid batching system 400, and several slurry dispersion systems 500. The powder batching system 300 includes several powder silos 301 and buffer silos 302. The powder silos 301 are connected to the buffer silos 302 via pipelines, and the buffer silos 302 are connected to the powder inlet 204 of the kneader 200 via pipelines. The liquid batching system 400 includes several liquid tanks 401, some of which are connected to the liquid inlet of the kneader 200 via pipelines. The slurry dispersion system 500 includes slurry tanks 501, each containing a stirrer 502. The outlet of the kneader 200 is connected to the slurry tanks 501, and some of the liquid tanks 401 in the liquid batching system 400 are also connected to the slurry tanks 501 via pipelines. In actual use, the powder from the powder batching system 300 is added into the kneader 200 through the powder inlet 204, and the liquid from the liquid batching system 400 is added into the kneader 200 through the liquid inlet. After the powder and liquid are fully mixed in the kneader 200, they are output from the outlet to the slurry dispersion system 500, where they are further mixed and dispersed with the liquid.

[0075] The above description is an explanation of this disclosure and not a limitation thereof. This disclosure may be modified in any form without departing from its spirit.

Claims

1. A counter-rotating differential screw kneading device comprising a screw mechanism (100) comprising a central screw (1) and a peripheral screw (2) in counter-rotating differential engagement, characterised in that: The central radial cross section (10) of the central screw (1) includes a plurality of central blades (13), and the peripheral radial cross section (20) of the peripheral screw (2) includes a plurality of peripheral blades (23). The central blades (13) are provided with a central blade concave surface (133) on the side facing the peripheral blades (23) along their rotation direction. The peripheral blades (23) are provided with a peripheral blade convex surface (233) on the side facing the central blades (13) along their rotation direction. The central blade concave surface (133) and the peripheral blade convex surface (233) are in an enveloping fit. The central blade concave surface (133) and the peripheral blade convex surface (233) have material kneading sections. There is a kneading gap e between the two material kneading sections. The kneading gap e is equal from the start of engagement to the end of engagement. The central blade concave surface (133) is provided with a first concave section (1331) and a second concave section (1332), and the peripheral blade convex surface (233) is provided with a convex section. (2331) and the third concave section (2332), the first concave section (1331) and the convex section (2331) are material kneading sections; the ratio of the arc length L1 of the first concave section (1331) to the arc length L2 of the convex section (2331) is: L1 / L2=n1 / n2; the central blade (13) includes the central blade tip diameter (131) and the central blade root diameter (132), and the peripheral blade (23) includes the peripheral blade tip diameter (231) and the peripheral blade root diameter (232). The diameter of the blade root (232) is equal to the diameter of ...

2. A differentiating differential screw mixing device in accordance with claim 1 characterized by: The kneading gap e is 0.1mm-10mm.

3. The heterodyne differential screw mixing device of claim 1, wherein: The meshing clearance c is 0.5mm-20mm.

4. The anti-directional differential screw kneading device according to claim 1, characterized in that: The number of central blades (13) is greater than or equal to the number of peripheral blades (23), and the number of central blades (13) is an integer multiple of the number of peripheral blades (23).

5. The anti-directional differential screw kneading device according to claim 1, characterized in that: Several central blades (13) extend outward from the central screw (1) along its rotation direction toward the peripheral screw (2) to form a rotating shape; several peripheral blades (23) extend outward from the peripheral screw (2) along its rotation direction toward the central screw (1) to form a rotating shape, with the rotating direction of the peripheral blades (23) being opposite to that of the central blades (13).

6. The anti-directional differential screw kneading device according to claim 1, characterized in that: The screw mechanism (100) is provided with several conveying areas and several kneading areas (103) along the screw axis; the conveying areas and kneading areas (103) are arranged at intervals; the central screw (1) and the peripheral screw (2) are provided with several conveying units corresponding to several conveying areas and several kneading units corresponding to several kneading areas (103); the conveying units of the central screw (1) and the peripheral screw (2) are engaged by spiral blades, and the kneading units are engaged by kneading blades.

7. The anti-directional differential screw kneading device according to claim 6, characterized in that: The conveying unit of the central screw (1) and the peripheral screw (2) is generated by the radial cross section containing several blades being helically twisted along the axial direction, and the conveying unit forms several helical blades on the screw.

8. The anti-directional differential screw kneading device according to claim 6, characterized in that: The kneading unit of the central screw (1) and the peripheral screw (2) is generated by a number of kneading blades with a cross-sectional shape that includes a number of blades, stacked along the axial direction and deflected by a certain angle in sequence along the circumference; from the feed end to the discharge end, the angle deflection direction of the kneading blades is opposite to the rotation direction of its screw.

9. The anti-directional differential screw kneading device according to claim 8, characterized in that: The ratio of the deflection angle α of the central kneading blade (15) of the central kneading unit (12) to the deflection angle β of the peripheral kneading blade (25) of the peripheral kneading unit (22) is: α / β = n1 / n2.

10. The anti-directional differential screw kneading device according to claim 6, characterized in that: The conveying area includes a feeding conveying area (101), an intermediate conveying area (102), and a discharging conveying area (104). Several intermediate conveying areas (102) and several kneading areas (103) are arranged at intervals. The central screw (1) and the peripheral screws (2) are provided with a first conveying unit, a second conveying unit, and a third conveying unit. The spiral direction of the first conveying unit is the same as that of the second conveying unit, and the spiral direction of the third conveying unit is opposite to that of the first and second conveying units. The first output unit is provided in the feeding conveying area (101), the second conveying unit is provided in the intermediate conveying area (102), and the third conveying unit is provided in the intermediate conveying area (102) and / or the discharging conveying area (104).

11. The anti-directional differential screw kneading device according to claim 10, characterized in that: The axial length L1 of the first conveying unit is greater than the axial length L2 of the second conveying unit, L1 = (2~50)L2; the axial length L2 of the second conveying unit is equal to the axial length L4 of the third conveying unit; the axial length L3 of the kneading unit is greater than or equal to the axial length L2 of the second conveying unit, L3 = (1.0~2.5)L2.

12. The anti-directional differential screw kneading device according to claim 1, characterized in that: The center screw (1) is engaged with at least one peripheral screw (2).

13. A continuous kneading machine, characterized in that: The device includes the counter-rotating differential screw kneading device according to any one of claims 1-12, wherein the screw mechanism (100) is disposed inside the mixing cylinder (202), and one end of the screw mechanism (100) is connected to the drive device (203); the mixing cylinder (202) is provided with at least one powder inlet (204), several liquid inlets, and several discharge outlets; the powder inlet (204) is disposed on one side of the feeding conveying area (101) of the screw mechanism (100), and the upper discharge outlet (207) and the lower discharge outlet (208) are disposed on one side of the discharge conveying area (104) of the screw mechanism (100); the mixing cylinder (202) and the drive device (203) are disposed on the frame (201).

14. A material preparation system, characterized in that: The continuous kneader as described in claim 13 is further comprising a powder batching system (300), a liquid batching system (400), and a plurality of slurry dispersion systems (500), wherein the powder batching system (300) is connected to the powder inlet (204) of the kneader (200), the liquid batching system (400) is connected to the liquid inlet of the kneader (200), and the outlet of the kneader (200) is connected to the slurry dispersion system (500).

15. The material preparation system according to claim 14, characterized in that: The powder batching system (300) includes several powder silos (301) and buffer silos (302). The powder silos (301) are connected to the buffer silos (302) through pipelines. The buffer silos (302) are connected to the powder inlet (204) of the kneader (200) through pipelines. The liquid batching system (400) includes several liquid tanks (401). Some of the liquid tanks (401) are connected to the liquid inlet of the kneader (200) through pipelines. Some of the liquid tanks (401) are connected to the slurry dispersion system (500) through pipelines. The slurry dispersion system (500) includes a slurry tank (501). A stirrer (502) is installed inside the slurry tank (501).

16. A counter-rotating differential screw engagement device, comprising a screw mechanism (100), the screw mechanism (100) comprising a central screw (1) and peripheral screws (2) engaged in counter-rotating differential speed engagement, characterized in that: The central radial cross section (10) of the central screw (1) includes a plurality of central blades (13), and the peripheral radial cross section (20) of the peripheral screw (2) includes a plurality of peripheral blades (23). The central blade (13) has a central blade concave surface (133) on the side facing the peripheral blades (23) along its rotation direction. The peripheral blades (23) have a peripheral blade convex surface (233) on the side facing the central blade (13) along its rotation direction. The central blade concave surface (133) and the peripheral blade convex surface (233) are enveloped and fitted. The central blade concave surface (133) and the peripheral blade convex surface (233) have material kneading sections. There is a kneading gap e between the material kneading sections of the two. The kneading gap e is equal from the start of engagement to the end of engagement.

17. The anti-directional differential screw kneading device according to claim 16, characterized in that: The concave surface of the central leaf (133) is provided with a first concave section (1331) and a second concave section (1332), and the convex surface of the peripheral leaf (233) is provided with a convex section (2331) and a third concave section (2332). The first concave section (1331) and the convex section (2331) are material kneading sections.

18. The anti-directional differential screw kneading device according to claim 17, characterized in that: The ratio of the arc length L1 of the first concave segment (1331) to the arc length L2 of the convex segment (2331) is: L1 / L2=n1 / n2.

19. The anti-directional differential screw kneading device according to claim 16, characterized in that: The central blade (13) includes the central blade tip diameter (131) and the central blade root diameter (132), and the peripheral blade (23) includes the peripheral blade tip diameter (231) and the peripheral blade root diameter (232); the diameter D1 of the central blade tip diameter (131) is equal to the diameter D2 of the peripheral blade tip diameter (231), and the diameter d1 of the central blade root diameter (132) is equal to the diameter d2 of the peripheral blade root diameter (232).

20. The anti-directional differential screw kneading device according to claim 19, characterized in that: There is a meshing gap c between the central root diameter (132) of the central blade (13) and the peripheral tip diameter (231) of the peripheral blade (23), where c = b - (d1 + D2) / 2 = b - (D1 + d2) / 2; the meshing gap c is 0.5 mm - 20 mm.

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