Double-cone screw extrusion device and extruder

Abstract

The utility model 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] This utility model relates to the field of material mixing technology, and more specifically, to a double cone screw extrusion device and an extruder. Background Technology

[0002] In the preparation of positive and negative electrode slurries for lithium batteries, parallel twin-screw extruders are often used to mix various materials. However, due to the limited groove depth of parallel twin-screw extruders, the material conveying capacity is restricted, and the material in the co-rotating meshing zone experiences relatively low shear force. This results in highly viscous lumps formed by the powder-liquid mixture being difficult to break, leading to abnormal loads, screw vibration, and increased wear. To improve shear force and compression ratio, conical twin-screw extruders are used. However, conical twin-screw extruders have a high compression ratio, and the pressure inside the extruder increases with material transport; excessive pressure can damage the equipment. Utility Model Content

[0003] The main objective of this invention is to provide a double cone screw extrusion device and extruder, which solves the problem of excessive pressure in the extruder causing damage to the equipment in the prior art.

[0004] To achieve the above objectives, according to one aspect of the present invention, a double-cone screw extrusion device is provided, comprising a housing having a feed inlet; a pair of conical screws rotatably connected to the housing, the two conical screws meshing with each other, and the conical screws having pressure relief grooves; and a drive assembly that drives the two conical screws to rotate in opposite directions.

[0005] Furthermore, the conical screw has a spiral extrusion channel with a pressure relief groove running through it. The two ends of the pressure relief groove are respectively connected to two axially adjacent and spaced-apart parts of the extrusion channel.

[0006] Furthermore, the conical screw includes a rod body and helical blades, with the helical blades disposed on the outer peripheral wall of the rod body; a pressure relief groove is disposed on the edge of the helical blades; and / or a pressure relief groove is disposed at the root of the helical blades; and / or a pressure relief groove is disposed on the rod body; and / or both the helical blades and the rod body have pressure relief grooves.

[0007] Furthermore, the helical blade includes an integral section arranged axially and a slotted section, with a pressure relief groove provided on the slotted section.

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

[0009] Furthermore, there are multiple pressure relief grooves, which are spaced apart along the spiral direction of the spiral blades.

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

[0011] Furthermore, the feed inlet is located on the side of the end with the larger diameter of the conical screw. The feed inlet includes a first feed inlet located above the integral section and a second feed inlet located above the slotted section.

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

[0013] Furthermore, pressure relief grooves are formed on the helical blades, and connecting grooves are formed on the rod body. The connecting grooves extend along the axial direction of the tapered screw and connect adjacent pressure relief grooves on the same slotted section along the axial direction of the tapered screw.

[0014] According to another aspect of the present invention, an extruder is provided, including a twin-cone screw extrusion device and a twin parallel screw extrusion device, wherein the feed end of the twin parallel screw extrusion device is disposed at the discharge end of the twin-cone screw extrusion device.

[0015] Furthermore, the twin parallel screw extrusion device includes a housing; a pair of straight screws arranged parallel to each other and meshing with each other; and a pair of meshing block assemblies arranged parallel to each other and cooperating with each other, the ends of the meshing block assemblies and the ends of the straight screws being connected to each other, and the axes of the connected straight screws and meshing block assemblies being collinear.

[0016] Furthermore, the number of straight screws and meshing block assemblies is multiple, and they are spaced apart along the axial direction of the straight screws.

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

[0018] By applying the technical solution of this utility model, the following technical effects are achieved:

[0019] When material enters the casing through the feed inlet, it travels with the two conical screws. As the material moves forward, its compression ratio gradually increases, generating significant pressure to accelerate fluid flow. Excessive pressure can damage the casing, leading to shorter material residence time and incomplete mixing. By incorporating a pressure relief groove, a buffer space is provided for the material, which also serves to release pressure and turbulence, preventing excessive pressure from causing overload. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 A front view of the twin-cone screw extrusion device of this utility model is shown;

[0022] Figure 2 A top view of the double cone screw extrusion device of this utility model is shown;

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

[0024] Figure 4 It shows Figure 3 Enlarged view of part A;

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

[0026] Figure 6 An isometric view of the extruder of this invention is shown;

[0027] Figure 7 A partial schematic diagram of the twin parallel screw extrusion device of this utility model is shown.

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

[0029] 10. Outer shell; 11. First feed inlet; 12. Second feed inlet; 20. Conical screw; 21. Pressure relief groove; 22. Rod body; 23. Spiral blade; 24. Integral section; 25. Grooved section; 26. Connecting groove; 30. Drive assembly; 40. Twin parallel screw extrusion device; 41. Shell; 42. Straight screw; 43. Engaging block assembly. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0032] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0033] To address the problem of excessive pressure within the extruder causing damage to the equipment in existing technologies, this utility model provides a double cone screw extrusion device and an extruder.

[0034] See Figures 1 to 3 The twin-cone screw extrusion device includes a housing 10, a pair of conical screws 20, and a drive 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 mesh with each other, the conical screws 20 have pressure relief grooves 21, and the drive assembly 30 drives the two conical screws 20 to rotate in opposite directions.

[0035] When the material enters the housing 10 through the feed inlet, it travels with the two conical screws 20. As the material moves forward, its compression ratio gradually increases, generating significant pressure to accelerate fluid flow. Excessive pressure can damage the system, leading to a shortened material residence time and incomplete mixing. By incorporating a pressure relief groove 21, a buffer space is provided for the material, which also serves to release pressure and turbulence, preventing excessive pressure from causing an overload.

[0036] The drive assembly 30 includes a drive motor and a reducer, as well as a gear set. The gear set is driven by the drive motor and the reducer, and drives the two conical screws 20 to move in opposite directions simultaneously.

[0037] In practical operation, some material will move towards the area of ​​higher pressure. The conical screw 20 outputs material from the feed end to the discharge end. As the screw gradually approaches the discharge end, the pressure on the material gradually increases. However, due to the presence of the through-hole pressure relief groove 21, some material will flow from the area of ​​higher pressure to the area of ​​lower pressure through the pressure relief groove 21, that is, some material will move from the discharge end towards the feed end. This increases the residence time of the material, making the material mix more evenly.

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

[0039] Specifically, the pressure relief groove 21 connects two axially adjacent and spaced-apart extrusion channels, allowing material to flow through the pressure relief groove 21 within the two axially adjacent and spaced-apart extrusion channels, reducing the occurrence of material blockage.

[0040] In this application, the tapered screw 20 includes a rod body 22 and a helical blade 23. The helical blade 23 is disposed on the outer peripheral wall of the rod body 22. A pressure relief groove 21 is disposed on the edge of the helical blade 23. And / or the pressure relief groove 21 is disposed at the root of the helical blade 23. And / or the pressure relief groove 21 is disposed on the rod body 22. And / or both the helical blade 23 and the rod body 22 are provided with pressure relief grooves 21.

[0041] Specifically, the pressure relief groove 21 can be formed at any position on the conical screw 20, on the edge or root of the helical blade 23, or on the rod body 22. Whether formed on the rod body 22 or the helical blade 23, it can increase the holding space for material at this position, thereby achieving the purpose of pressure relief.

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

[0043] Specifically, the integral section 24 is mainly responsible for pressurization, increasing the compression ratio to generate stronger shear force, making the material mix more evenly, while the slotted section 25 is used for pressure relief, which can prevent the pressure from increasing further.

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

[0045] By setting up multiple integral sections 24 and slotted sections 25, during the material's journey, the material first enters the integral section 24, where it undergoes initial mixing under pressure. Then it enters the slotted section 25, where it is repeatedly mixed to ensure thorough mixing. After further pressure treatment in the integral section 24 and repeated mixing in the slotted section 25, the material is mixed more evenly. The use of multiple integral sections 24 and pressure sections with colloid properties allows for thorough mixing of the material, improving the mixing effect.

[0046] In this application, there are multiple pressure relief grooves 21, which are spaced apart along the spiral direction of the spiral blades 23.

[0047] Specifically, by setting multiple pressure relief grooves 21, the pressure relief effect provided by the pressure relief grooves 21 can be increased. At the same time, more materials can be returned through the pressure relief grooves 21, increasing the time that materials stay in the grooved section 25 and improving the mixing effect of materials.

[0048] In this application, along the helical direction of the helical blade 23, the pressure relief grooves 21 located on the same slotted section 25 are spaced at the same interval.

[0049] Because the screw 20 is conical and the spiral blades 23 are generally constricted, when the spacing of the pressure relief grooves 21 is the same, two adjacent pressure relief grooves 21 along the screw axis will be slightly misaligned. The line connecting two axially adjacent pressure relief grooves 21 in the opposite direction to the spiral blades 23 forms a spiral shape similar to that of the spiral blades 23. When the conical screw 20 rotates, the pressure relief grooves 21, with this configuration, will tend to move towards the discharge end, allowing the material to remain in the slotted section 25 for a longer time, resulting in more thorough mixing of the material.

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

[0051] In this application, the feed inlet is located on the side of the tapered screw 20 at the end with the larger diameter. The feed inlet includes a first feed inlet 11 and a second feed inlet 12. The first feed inlet 11 is located above the integral section 24, and the second feed inlet 12 is located above the slotted section 25. The first feed inlet 11 is a solid feed inlet, and the second feed inlet 12 is a liquid feed inlet. The second feed inlet 12 is located further away from the end of the tapered screw 20 with the larger diameter than the first feed inlet 11.

[0052] Specifically, solid material is first fed through the first feed inlet 11 and pressurized through the first end integral section 24. As the material moves, it moves to the second feed inlet 12, where liquid material is added to mix the two materials. The pressure relief tank 21 increases the residence time of the material, improving the mixing effect.

[0053] The feed inlet is located at the end of the conical screw with a larger diameter. As the material is conveyed along the conical screw, the diameter gradually decreases, resulting in a compression ratio that compacts the material, thus increasing the filling rate and allowing for more thorough shearing and dispersion.

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

[0055] The distance between two adjacent pressure relief grooves 21 along the spiral direction of the spiral blade 23 may be the same or different. When the distance between two adjacent pressure relief grooves 21 is the same, because the spiral blade 23 is generally contracted, the adjacent pressure relief grooves 21 in the axial direction of the rod 22 will be misaligned. This causes the connecting groove 26 to be approximately in the axial direction of the rod 22, but in a spiral shape, and the direction of this spiral shape is opposite to the direction of the spiral blade 23. This increases the tendency for non-recirculation, allowing the material to stay in the slotted section 25 for a longer time, resulting in more thorough mixing of the material.

[0056] In this application, the twin-cone screw extrusion device also includes a discharge elbow, which is located at the discharge end of the housing 10.

[0057] By incorporating an elbow, it is easier to collect the material at the discharge end of the twin-cone screw extruder.

[0058] See Figure 6 and Figure 7 An extruder includes a twin-cone screw extrusion unit and a twin-parallel screw extrusion unit 40, wherein the feed end of the twin-parallel screw extrusion unit 40 is located at the discharge end of the twin-cone screw extrusion unit.

[0059] Specifically, after the material is mixed by the twin cone screw extruder, it is further mixed by the twin parallel screw extruder 40, which can improve the overall mixing effect of the material.

[0060] In this application, the parallel screw extrusion device includes a housing 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 and mesh 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. The axes of the connected straight screws 42 and 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 difficult-to-break agglomerates in the mixed slurry. The meshing block assembly 43 breaks up these agglomerates, so that the slurry can be evenly dispersed, thereby improving the quality of the final product.

[0062] In this application, there are multiple sets of straight screws 42 and engagement block assemblies 43, which are spaced apart along the axial direction of the straight screws 42.

[0063] To ensure a stable final product slurry, the material needs to be crushed multiple times in the twin parallel screw extruder 40. During the crushing process, a small amount of liquid can be added at different crushing points, and corresponding liquid inlets should be provided on the shell 41. Some materials cannot be excessively sheared and dispersed, so they need to be added later. The liquid inlets at different locations are configured for different formulations and slurries. This allows for a wider range of product applications, including the mixing of various materials.

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

[0065] When materials are mixed, once a certain level of mixing is reached, further mixing in the twin parallel screw extruder 40 becomes difficult to increase the degree of mixing. Therefore, the twin parallel screw extruder 40 has an optimal and suitable length. If the materials are thoroughly mixed in the twin cone screw extruder, then only light mixing is needed in the parallel screw extruder; in this case, the parallel screw extruder is shorter, and the twin cone screw extruder is longer. Conversely, if the materials are lightly mixed in the twin cone screw extruder, then thorough mixing is required in the parallel screw extruder; in this case, the parallel screw extruder is longer, and the twin cone screw extruder is shorter.

[0066] The longer the twin-screw, the more thorough the shearing and dispersion of the material, reducing the need for additional shearing and dispersion at the rear end. Consequently, the length of the parallel twin-screw can also be reduced. If the length of the parallel twin-screw at the rear end is not reduced, the oversaturated shearing and dispersion will lead to overshearing of the slurry, disrupting the material's flowability. Therefore, the lengths of the two are negatively correlated.

[0067] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0068] 1. When the material enters the housing 10 through the feed inlet, it interacts with the two conical screws 20. As the material progresses, its compression ratio gradually increases, generating significant pressure to accelerate fluid flow. Excessive pressure can damage the system, leading to a shortened material residence time and incomplete mixing. By providing a pressure relief groove 21, a buffer space is provided for the material, which also serves to release pressure and turbulence, preventing excessive pressure from causing an overload.

[0069] 2. In actual operation, some material will move towards the area of ​​higher pressure. The conical screw 20 outputs material from the feed end to the discharge end. As the screw gradually approaches the discharge end, the pressure on the material gradually increases. However, due to the presence of the through-type pressure relief groove 21, some material will flow from the area of ​​higher pressure to the area of ​​lower pressure through the pressure relief groove 21, that is, some material will move from the discharge end towards the feed end. This increases the residence time of the material, making the material mix more evenly.

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

[0071] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0072] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

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

[0074] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A twin-cone screw extrusion device, characterized in that, include: The outer casing (10) has a feed inlet; A pair of conical screws (20) are arranged, the conical screws (20) are rotatably connected to the outer shell (10), the two conical screws (20) mesh with each other, and the conical screws (20) have pressure relief grooves (21); A drive assembly (30) drives the two tapered screws (20) to rotate in opposite directions.

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

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

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

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

6. The twin-tapered screw extruder according to claim 4, characterized in that, The number of pressure relief grooves (21) is multiple, and they are spaced apart along the spiral direction of the spiral blades (23).

7. The twin-tapered screw extruder according to claim 6, characterized in that, Along the helical direction of the helical blade (23), the spacing between the pressure relief grooves (21) located on the same slotted section (25) is the same.

8. The twin-cone screw extruder according to claim 4, characterized in that, The feed inlet is located on the side of the larger diameter end of the tapered screw (20), and the feed inlet includes: The first feed inlet (11) is located above the integral section (24); The second feed inlet (12) is located above the slotted section (25).

9. The twin-tapered 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 further away from the end of the tapered screw (20) with a larger diameter than the first feed port (11).

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

11. An extruder, characterized in that, include: The twin-cone screw extruder according to any one of claims 1-10; A twin parallel screw extrusion device (40) is provided with its feed end located at the discharge end of the twin cone screw extrusion device.

12. The extruder according to claim 11, characterized in that, The twin parallel screw extrusion device (40) includes: Shell (41); A pair of straight screws (42) are arranged, the two straight screws (42) are parallel to each other, and the two straight screws (42) mesh with each other; The two meshing block assemblies (43) are arranged in pairs, and 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. The axes of the straight screws (42) and the meshing block assemblies (43) are collinear.

13. The extruder according to claim 12, characterized in that, The number of straight screws (42) and meshing block assemblies (43) is multiple, and they are spaced apart along the axial direction of the straight screws (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 cone screw extruder.

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