Double-cone screw extrusion device and extruder

Abstract

The invention provides a double-cone screw extrusion device and an extruder. The double-cone screw extrusion device comprises a shell, and a feeding hole is formed in the shell; the conical screw rods are arranged in pairs, the conical screw rods are rotationally connected with the shell, the two conical screw rods are meshed with each other, and each conical screw rod is provided with a pressure relief groove; and the driving assembly drives the two conical screw rods to rotate in opposite directions. The double-cone screw extrusion device solves the problem that in the prior art, equipment is damaged due to the fact that pressure in an extruder is too large.

Description

Technical Field

[0001] The invention relates to the technical field of material mixing, in particular to a twin-conical screw extruder and an extruder. Background Art

[0002] In the field of lithium battery positive and negative electrode slurry preparation, parallel twin-screw extruders are often used to mix a variety of materials. Due to the limited groove depth of the parallel twin-screw, the material conveying capacity is limited, and the shear force on the materials in the co-rotating meshing area is small. The high-viscosity block formed by the powder-liquid mixture is difficult to break, which will produce abnormal loads, causing the screw to shake and increase wear. In order to increase the shear force and compression ratio, a conical twin-screw extruder is used. However, due to the large compression ratio of the conical twin-screw extruder, and as the material is transported, the pressure in the extruder will increase, and excessive pressure will cause damage to the equipment. Summary of the invention

[0003] The main purpose of the present invention is to provide a twin-conical screw extruder and an extruder. The twin-conical screw extruder solves the problem in the prior art that excessive pressure in the extruder causes damage to the equipment.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a twin-conical screw extruder is provided, comprising a shell having a feed port; conical screws arranged in pairs, the conical screws being rotatably connected to the shell, the two conical screws being meshed with each other, and the conical screws having a pressure relief groove; and a drive assembly, the drive assembly driving the two conical screws to rotate in opposite directions.

[0005] Furthermore, the conical screw has a spiral extrusion channel, and a pressure relief groove is arranged through the channel, and two ends of the pressure relief groove are respectively connected to two parts of the extrusion channel that are axially adjacent and spaced apart.

[0006] Furthermore, the conical screw includes a rod body and a spiral blade, the spiral blade is arranged on the outer peripheral wall of the rod body; the pressure relief groove is arranged on the edge of the spiral blade; and / or the pressure relief groove is arranged at the root of the spiral blade; and / or the pressure relief groove is arranged on the rod body; and / or pressure relief grooves are provided on both the spiral blade and the rod body.

[0007] Furthermore, the spiral blade includes an integral section and a slotted section which are arranged axially, and a pressure relief groove is provided on the slotted section.

[0008] Furthermore, there are multiple integral sections and slotted sections, and along the axial direction of the conical screw, the integral sections and slotted sections are alternately arranged in sequence.

[0009] Furthermore, there are multiple pressure relief grooves, which are arranged at intervals along the spiral direction of the spiral blade.

[0010] Furthermore, along the spiral direction of the spiral blade, the intervals between the pressure relief grooves on the same slotted section are the same.

[0011] Furthermore, the feed port is arranged on the side of the end with a larger diameter of the conical screw, and the feed port includes a first feed port, which is arranged above the integral section; and a second feed port, which is arranged above the slotted section.

[0012] Furthermore, the first feed port is a solid feed port, the second feed port is a liquid feed port, and the second feed port is farther away from the end with a larger diameter of the conical screw than the first feed port.

[0013] Furthermore, a pressure relief groove is provided on the spiral blade, a connecting groove is provided on the rod body, the connecting groove extends along the axial direction of the conical screw, and the connecting groove connects adjacent pressure relief grooves on the same slotted section along the axial direction of the conical screw.

[0014] According to another aspect of the present invention, an extruder is provided, comprising a twin conical screw extruder and a twin parallel screw extruder, wherein a feed end of the twin parallel screw extruder is arranged at a discharge end of the twin conical screw extruder.

[0015] Furthermore, the twin parallel screw extruder device includes a shell; straight screws arranged in pairs, the two straight screws are parallel to each other and meshed with each other; meshing block assemblies are arranged in pairs, the two meshing block assemblies are parallel to each other and cooperate with each other, the ends of the meshing block assemblies and the ends of the straight screws are connected to each other, and the axes of the interconnected straight screws and the meshing block assemblies are collinear.

[0016] Furthermore, there are multiple groups of straight screw and meshing block assemblies, which are arranged at intervals along the axial direction of the straight screw.

[0017] Furthermore, the length of the twin parallel screw extruder is negatively correlated with the length of the twin conical screw extruder.

[0018] By applying the technical solution of the present invention, the following technical effects are achieved:

[0019] When the material enters the shell through the feed port, the material and the two conical screws will gradually increase the compression ratio of the material as the material moves, generating a large pressure to accelerate the flow of the fluid. Excessive pressure will damage the setting, resulting in a shortened material residence time and inadequate mixing. By setting up a pressure relief groove, a buffer space can be provided for the material and a certain pressure relief and flow disturbance can be achieved, avoiding excessive pressure causing excessive load. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1A front view of a twin-conical screw extruder of the present invention is shown;

[0022] Figure 2 A top view of a twin-conical screw extruder of the present invention is shown;

[0023] Figure 3 A top view of a twin-conical screw extruder according to one embodiment of the present invention is shown;

[0024] Figure 4 Shows Figure 3 A magnified view of part A;

[0025] Figure 5 A top view of a twin-conical screw extruder according to another embodiment of the present invention is shown;

[0026] Figure 6 An axonometric view of an extruder of the present invention is shown;

[0027] Figure 7 A partial schematic diagram of a twin parallel screw extruder of the present invention is shown.

[0028] The above drawings include the following reference numerals:

[0029] 10. Shell; 11. First feed port; 12. Second feed port; 20. Conical screw; 21. Pressure relief groove; 22. Rod body; 23. Spiral blade; 24. Integral section; 25. Slotted section; 26. Connecting groove; 30. Drive assembly; 40. Twin parallel screw extruder; 41. Shell; 42. Straight screw; 43. Meshing block assembly. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0032] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0033] In order to solve the problem in the prior art that excessive pressure in an extruder causes damage to the equipment, the present invention provides a twin-conical screw extrusion device and an extruder.

[0034] See also Figures 1 to 3 The double conical screw extruder comprises a housing 10, conical screws 20 arranged in pairs and a driving assembly 30. The housing 10 has a feed port, the conical screws 20 are rotatably connected to the housing 10, the two conical screws 20 are meshed with each other, the conical screws 20 have a pressure relief groove 21, and the driving assembly 30 drives the two conical screws 20 to rotate in opposite directions.

[0035] When the material enters the housing 10 through the feed port, the material and the two conical screws 20, as the material moves, the compression ratio of the material will gradually increase, generating a large pressure to accelerate the flow of the fluid, and excessive pressure will damage the device, resulting in a shortened residence time of the material and inadequate mixing. By setting the pressure relief groove 21, a buffer space can be provided for the material and a certain pressure relief and flow disturbance effect can be achieved, thereby avoiding excessive pressure causing excessive load.

[0036] The driving assembly 30 includes a driving motor and a reducer, and also includes a gear set. The gear set is driven by the driving motor and the reducer, and drives the two conical screws 20 to move in opposite directions at the same time through the gear set.

[0037] In actual work, part of the material will move toward the part with pressure. The conical screw 20 outputs the material from the feed end to the discharge end. As the screw gradually approaches the discharge end, the pressure received by the material will gradually increase. However, due to the existence of the through pressure relief groove 21, part of the material will pass through the pressure relief groove 21 and flow from the part with high pressure to the part with low pressure, that is, part of the material will move from the discharge end to the feed end. This can increase the residence time of the material and make the material mixed more evenly.

[0038] In the present application, the conical screw 20 has a spiral extrusion channel, and the pressure relief groove 21 is arranged through it. The two ends of the pressure relief groove 21 are respectively connected to two parts of the extrusion channel that are axially adjacent and spaced apart.

[0039] Specifically, the pressure relief groove 21 connects two parts of the extrusion channel that are axially adjacent and spaced apart, so that the material can flow through the pressure relief groove 21 in the two parts of the extrusion channel that are axially adjacent and spaced apart, reducing the occurrence of material blockage.

[0040] In the present application, the conical screw 20 includes a rod body 22 and a spiral blade 23, wherein the spiral blade 23 is arranged on the outer peripheral wall of the rod body 22; the pressure relief groove 21 is arranged on the edge of the spiral blade 23; and / or the pressure relief groove 21 is arranged at the root of the spiral blade 23; and / or the pressure relief groove 21 is arranged on the rod body 22; and / or the pressure relief groove 21 is provided on both the spiral blade 23 and the rod body 22.

[0041] Specifically, the pressure relief groove 21 can be opened at any position of the conical screw 20, at the edge or root of the spiral blade 23, or on the rod body 22. Whether it is opened on the rod body 22 or the spiral blade 23, the accommodating space for accommodating materials at this position can be increased, thereby achieving the purpose of pressure relief.

[0042] See also Figure 3 and Figure 4 The spiral blade 23 includes an integral section 24 and a slotted section 25 arranged axially, and a pressure relief groove 21 is provided on the slotted section 25 .

[0043] Specifically, the integral section 24 is mainly responsible for pressurizing, increasing the compression ratio to generate a stronger shear force so that the materials are mixed more evenly, and the slotted section 25 is used for pressure relief, which can prevent the pressure from further increasing.

[0044] In the present application, there are multiple integral sections 24 and slotted sections 25 , and along the axial direction of the conical screw 20 , the integral sections 24 and slotted sections 25 are alternately arranged in sequence.

[0045] By setting a plurality of integral sections 24 and slotted sections 25, during the material movement, the material first enters the integral section 24, is preliminarily mixed by pressurization, and then enters the slotted section 25, where it is repeatedly mixed so that the material is fully mixed. Then, the material is repeatedly mixed by pressurization in the integral section 24 and by the slotted section 25, so that the material can be mixed more evenly. By setting a plurality of integral sections 24 and pressurization sections provided with colloids, the boring material can be fully mixed, thereby improving the mixing effect of the boring material.

[0046] In the present application, there are multiple pressure relief grooves 21 , which are arranged at intervals along the spiral direction of the spiral blade 23 .

[0047] Specifically, by providing a plurality of pressure relief grooves 21, the pressure relief effect provided by the pressure relief grooves 21 can be increased, and more materials can flow back through the pressure relief grooves 21, thereby increasing the time the materials stay in the slotted section 25 and improving the mixing effect on the materials.

[0048] In the present application, along the spiral direction of the spiral blade 23, the intervals between the pressure relief grooves 21 located on the same slotted section 25 are the same.

[0049] Since the conical screw 20 has a spiral blade 23 that is contracted as a whole, when the intervals between the pressure relief grooves 21 are the same, two pressure relief grooves 21 adjacent to each other along the axial direction of the screw will be misaligned to a certain extent, and the line connecting the two axially adjacent pressure relief grooves 21 in the opposite direction to the spiral blade 23 is a spiral shape in the same direction as the spiral blade 23. When the conical screw 20 rotates, the pressure relief grooves 21 arranged in this way will increase the tendency to move toward the discharge end, so that the material can stay in the slot section 25 for a longer time, so that the material is mixed more fully.

[0050] The spiral direction of the pressure relief groove 21 is opposite to the spiral direction of the spiral blade 23, which enhances shearing; the uniform distribution of the pressure relief grooves 21 can reduce the load fluctuation amplitude during the periodic rotation process caused by pressure imbalance.

[0051] In the present application, the feed port is arranged on the side of the end with a larger diameter of the conical screw 20, and the feed port includes a first feed port 11 and a second feed port 12, the first feed port 11 is arranged above the integral section 24, and the second feed port 12 is arranged above the slotted section 25. The first feed port 11 is a solid feed port, the second feed port 12 is a liquid feed port, and the second feed port 12 is farther away from the end with a larger diameter of the conical screw 20 than the first feed port 11.

[0052] Specifically, the solid material is first fed through the first feed port 11, pressurized through the first end integral section 24, and moves to the second feed port 12 as the material moves, and the liquid material is added to the second feed port 12 to mix the two materials. The pressure relief groove 21 is used to increase the residence time of the material and improve the mixing effect of the material.

[0053] The feed port is at the end with the larger diameter of the conical screw. In this way, the material will be compacted as the diameter gradually decreases during transportation along the conical screw, resulting in a compression ratio, thereby increasing the filling rate and making shear dispersion more sufficient.

[0054] See also Figure 5 In another embodiment, the pressure relief groove 21 is opened on the spiral blade 23, and a connecting groove 26 is opened on the rod body 22. The connecting groove 26 extends along the axial direction of the conical screw 20, and the connecting groove 26 connects the adjacent pressure relief grooves 21 on the same slotted section 25 along the axial direction of the conical screw 20.

[0055] The distances between two adjacent pressure relief grooves 21 along the spiral direction of the spiral blade 23 are the same or different. When the distances between two adjacent pressure relief grooves 21 are the same, the spiral blade 23 is in a contracted shape as a whole, which will cause the adjacent pressure relief grooves 21 in the axial direction of the rod body 22 to be misaligned, so that the connecting groove 26 is approximately in the axial direction of the rod body 22, but is in a spiral shape as a whole, and the rotation direction of the spiral shape is opposite to that of the spiral blade 23. This increases the tendency of boring backflow, allowing the material to stay in the slot section 25 for a longer time, so that the material is mixed more fully.

[0056] In the present application, the twin-conical screw extruder further includes a discharge elbow, which is disposed at the discharge end of the housing 10 .

[0057] By arranging the elbow, it is convenient to collect the materials at the discharge end of the twin-conical screw extruder.

[0058] See also Figure 6 and Figure 7 An extruder includes a twin-conical screw extruder and a twin-parallel screw extruder 40, wherein the feed end of the twin-parallel screw extruder 40 is arranged at the discharge end of the twin-conical screw extruder.

[0059] Specifically, after the materials are mixed by the twin conical screw extruder, they are further mixed by the twin parallel screw extruder 40, which can improve the overall mixing effect of the materials.

[0060] In the present application, the parallel screw extruder device includes a shell 41, a pair of straight screws 42 and a pair of meshing block assemblies 43, the two straight screws 42 are parallel to each other, the two straight screws 42 are meshed with each other, the two meshing block assemblies 43 are parallel to each other and cooperate with each other, the ends of the meshing block assemblies 43 and the ends of the straight screws 42 are connected to each other, and the axes of the interconnected straight screws 42 and the meshing block assemblies 43 are collinear.

[0061] The meshing block assembly 43 mainly includes meshing toothed discs. After the materials are fully mixed, there may be some hard-to-break agglomerates in the mixed slurry. The meshing block assembly 43 breaks these agglomerates so that the slurry can be evenly dispersed, thereby improving the quality of the final product.

[0062] In the present application, there are multiple groups of straight screws 42 and engaging block assemblies 43 , which are spaced apart along the axial direction of the straight screw 42 .

[0063] In order to ensure the final stable basic finished slurry, the material needs to be crushed multiple times in the dual parallel screw extruder 40. During the crushing process, a small amount of liquid can be appropriately added at different crushing positions, and a corresponding liquid adding port should be opened on the corresponding shell 41. Some materials cannot be excessively sheared and dispersed, so the position of addition needs to be relatively late. The liquid adding ports at different positions are configured for different slurries with different formulas. This makes the product more widely used and uses a mixture of multiple different materials.

[0064] In the present application, the length of the twin parallel screw extruder 40 is negatively correlated with the length of the twin conical screw extruder.

[0065] The materials are being mixed. When the materials are mixed to a certain degree, it is difficult to continue to improve the mixing degree of the materials by continuing to mix them in the twin parallel screw extruder 40. Therefore, the twin parallel screw extruder 40 has an optimal and suitable length. When the materials are fully mixed in the twin conical screw extruder, they can be lightly mixed in the parallel screw extruder. At this time, the parallel screw extruder is shorter and the twin conical screw extruder is longer. When the materials are lightly mixed in the twin conical screw extruder, they need to be fully mixed in the parallel screw extruder. At this time, the parallel screw extruder is longer and the twin conical screw extruder is shorter.

[0066] The longer the twin conical screw is, the more complete the shear dispersion of the material is, the supplementary shear dispersion required at the rear end can be reduced, and the corresponding parallel twin screw length can also be shortened. If the length of the rear parallel twin screw is not shortened, the oversaturated shear dispersion will cause over-shear of the slurry and destroy the retention of the material processing flow. Therefore, the lengths of the two are negatively correlated.

[0067] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0068] 1. When the material enters the housing 10 through the feed port, the material and the two conical screws 20, as the material moves, the compression ratio of the material will gradually increase, generating a large pressure to accelerate the flow of the fluid. Excessive pressure will damage the device, resulting in a shortened residence time of the material and inadequate mixing. By setting the pressure relief groove 21, a buffer space can be provided for the material and a certain pressure relief and turbulence effect can be achieved, thereby avoiding excessive pressure causing excessive load.

[0069] 2. In actual work, part of the material will move toward the part with pressure. The conical screw 20 outputs the material from the feed end to the discharge end. As the screw gradually approaches the discharge end, the pressure received by the material will gradually increase. However, due to the existence of the through pressure relief groove 21, part of the material will pass through the pressure relief groove 21 and flow from the part with high pressure to the part with low pressure, that is, part of the material will move from the discharge end to the feed end. This can increase the residence time of the material and make the material mixed more evenly.

[0070] 3. The pressure relief groove 21 connects two parts of the extrusion channel that are axially adjacent and spaced apart, so that the material can flow through the pressure relief groove 21 in the two parts of the extrusion channel that are axially adjacent and spaced apart, reducing the occurrence of material blockage.

[0071] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0072] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0073] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0074] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A twin-conical screw extruder, characterized in that: include: A housing (10), wherein the housing (10) has a feed inlet; Conical screws (20) are arranged in pairs, the conical screws (20) are rotatably connected to the housing (10), the two conical screws (20) are meshed with each other, and the conical screws (20) have a pressure relief groove (21); A driving assembly (30) drives the two conical screws (20) to rotate in opposite directions.

2. The twin conical screw extruder according to claim 1, characterized in that: The conical screw (20) has a spiral extrusion channel, the pressure relief groove (21) is arranged through it, and the two ends of the pressure relief groove (21) are respectively connected to two parts of the extrusion channel that are axially adjacent and spaced apart.

3. The twin conical screw extruder according to claim 1, characterized in that: The conical screw (20) comprises a rod body (22) and a spiral blade (23), wherein the spiral blade (23) is arranged on the outer peripheral wall of the rod body (22); The pressure relief groove (21) is arranged on the edge of the spiral blade (23); and / or The pressure relief groove (21) is arranged at the root of the spiral blade (23); and / or The pressure relief groove (21) is arranged on the rod body (22); and / or The spiral blade (23) and the rod body (22) are both provided with the pressure relief groove (21).

4. The twin conical screw extruder according to claim 3, characterized in that: The spiral blade (23) comprises an integral section (24) and a slotted section (25) arranged axially, and the slotted section (25) is provided with the pressure relief groove (21).

5. The twin conical screw extruder according to claim 4, characterized in that: The number of the integral sections (24) and the slotted sections (25) is plural, and along the axial direction of the conical screw (20), the integral sections (24) and the slotted sections (25) are alternately arranged in sequence.

6. The twin-conical screw extruder according to claim 4, characterized in that: The pressure relief grooves (21) are multiple in number and are arranged at intervals along the spiral direction of the spiral blade (23).

7. The twin conical screw extruder according to claim 6, characterized in that: Along the spiral direction of the spiral blade (23), the intervals between the pressure relief grooves (21) located on the same slotted section (25) are the same.

8. The twin-conical screw extruder according to claim 4, characterized in that: The feed port is arranged on the side of the end of the conical screw (20) with a larger diameter, and the feed port comprises: A first feed inlet (11), the first feed inlet (11) being arranged above the integral section (24); A second feed inlet (12), wherein the second feed inlet (12) is arranged above the slotted section (25).

9. The twin-conical screw extruder according to claim 8, characterized in that: The first feed port (11) is a solid feed port, the second feed port (12) is a liquid feed port, and the second feed port (12) is farther away from the end of the conical screw (20) with a larger diameter than the first feed port (11).

10. The twin conical screw extruder according to claim 4, characterized in that: The pressure relief groove (21) is provided on the spiral blade (23), and a connecting groove (26) is provided on the rod body (22). The connecting groove (26) extends along the axial direction of the conical screw (20), and the connecting groove (26) connects the pressure relief grooves (21) adjacent to each other on the same slotted section (25) along the axial direction of the conical screw (20).

11. An extruder, characterized in that: include: The twin-conical screw extruder according to any one of claims 1 to 10; A twin parallel screw extruder (40), wherein the feed end of the twin parallel screw extruder (40) is arranged at the discharge end of the twin conical screw extruder.

12. The extruder according to claim 11, characterized in that The twin parallel screw extruder (40) comprises: Housing (41); Straight screws (42) are arranged in pairs, the two straight screws (42) are parallel to each other, and the two straight screws (42) are meshed with each other; The meshing block assemblies (43) are arranged in pairs, the two meshing block assemblies (43) are parallel to each other and cooperate with each other, the ends of the meshing block assemblies (43) and the ends of the straight screws (42) are connected to each other, and the axes of the connected straight screws (42) and the meshing block assemblies (43) are collinear.

13. The extruder according to claim 12, characterized in that The straight screw (42) and the meshing block assembly (43) are provided in a plurality of groups and are arranged at intervals along the axial direction of the straight screw (42).

14. The extruder according to claim 11, characterized in that The length of the twin parallel screw extruder (40) is negatively correlated with the length of the twin conical screw extruder.

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