Extrusion device

Abstract

The invention provides an extrusion device, and relates to the field of batteries. The extrusion device comprises a machine barrel and an extrusion piece, a material conveying channel is formed in the machine barrel, and the material conveying channel is provided with an inlet and an outlet. The extrusion part is at least partially located in the conveying channel and used for extruding the materials and conveying the materials from the inlet to the outlet. Wherein a groove is formed in the wall face of the material conveying channel, and at least part of the groove is located between the inlet and the outlet in the axial direction of the material conveying channel. The groove is formed in the wall face of the material conveying channel, and at least part of the groove is located between the inlet and the outlet, so that the wall face of the material conveying channel is concave and convex, the friction force between the wall face of the material conveying channel and materials is increased, and sliding between the materials and the wall face of the material conveying channel is reduced advantageously; and more materials can move towards the outlet under the action of the extrusion piece, so that the production efficiency of the extrusion device is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular, to an extrusion device. Background Art

[0002] Batteries are widely used in the field of new energy, such as electric vehicles and new energy vehicles. New energy vehicles and electric vehicles have become a new trend in the development of the automotive industry. Batteries include electrode assemblies, which are components in batteries where electrochemical reactions occur. Electrode assemblies are mainly wound or stacked with positive and negative electrode sheets. The production efficiency of the electrode sheet has a significant impact on battery production. However, the current production efficiency of the electrode sheet is relatively low. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide an extrusion device, which aims to improve the problem of low production efficiency of pole pieces in the related art.

[0004] An embodiment of the present application provides an extrusion device, which includes a barrel and an extrusion piece, wherein a feed channel is formed inside the barrel, and the feed channel has an inlet and an outlet; the extrusion piece is at least partially located in the feed channel, and the extrusion piece is used to extrude material and transport the material from the inlet to the outlet; wherein a groove is provided on the wall surface of the feed channel, and along the axial direction of the feed channel, the groove is at least partially located between the inlet and the outlet.

[0005] In the above technical solution, by providing a groove on the wall of the feed channel, and the groove is at least partially located between the inlet and the outlet, the wall of the feed channel is formed with a concave-convex shape, which increases the friction between the wall of the feed channel and the material, and is conducive to reducing the sliding between the material and the wall of the feed channel, so that the material can move more toward the outlet under the action of the extruder, thereby improving the production efficiency of the extrusion device. In addition, since the material can move more toward the outlet under the action of the extruder, it is conducive to increasing the pressure building capacity of the extruder, reducing production capacity fluctuations, and increasing production.

[0006] As an optional technical solution of the embodiment of the present application, a plurality of the grooves are arranged on the wall surface of the feed channel, and the plurality of the grooves are arranged at intervals along the circumference of the feed channel.

[0007] In the above technical solution, a plurality of grooves are arranged at intervals on the wall of the feed channel along the circumference of the feed channel, so as to further increase the friction between the wall of the feed channel and the material and reduce the sliding between the material and the wall of the feed channel, so that the material can move more toward the outlet under the action of the extruder, thereby improving the production efficiency of the extrusion device.

[0008] As an optional technical solution of an embodiment of the present application, along the circumference of the feed channel, the distance between two adjacent grooves is A, and the width of the groove is B, satisfying: 0.7≤A / B≤1.3, preferably, 0.9≤A / B≤1.1.

[0009] In the above technical solution, by making the ratio of the spacing between two adjacent grooves along the circumference of the feed channel to the width of the groove within the range of 0.7 to 1.3, the spacing between two adjacent grooves along the circumference of the feed channel is close to the groove width of the groove, which can not only make the friction between the wall of the feed channel and the material larger, but also reduce the risk of the material being sheared in the groove and accumulating in the groove to form a dead zone. If the material accumulates in the groove to form a dead zone, it is equivalent to the groove being filled, which will cause the friction between the wall of the feed channel and the material to fluctuate, thereby affecting the production efficiency. When A / B<0.7, the groove width of the groove is too large, and the number of grooves that can be set along the circumference of the feed channel is relatively small, so that the friction between the wall of the feed channel and the material is relatively small. When A / B>1.3, the groove width of the groove is too small, the material is easily sheared by the groove, and the risk of accumulating in the groove to form a dead zone increases. When 0.9≤A / B≤1.1, the circumferential spacing between two adjacent grooves along the feed channel is closer to the groove width of the groove, which can not only increase the friction between the wall of the feed channel and the material, but also reduce the risk of the material being sheared in the groove and accumulating in the groove to form a dead zone.

[0010] As an optional technical solution of an embodiment of the present application, a plurality of the grooves are arranged at equal intervals along the circumference of the feed channel.

[0011] In the above technical solution, by arranging multiple grooves at equal intervals along the circumference of the feed channel, the wall surface of the feed channel is uniformly concave and convex, and the friction between the material and the wall surface of the feed channel changes less, which is conducive to the movement of the material to the outlet under the action of the extruder. In addition, by arranging multiple grooves at equal intervals along the circumference of the feed channel, the grooves have a more balanced effect on the strength of the barrel along the circumference of the feed channel, making it less likely for the barrel to be damaged due to the strength of a certain position being significantly weaker than that of other positions.

[0012] As an optional technical solution of an embodiment of the present application, along the circumference of the feed channel, the width of the groove is equal to the distance between two adjacent grooves.

[0013] In the above technical solution, by making the spacing between two adjacent grooves along the circumferential direction of the material conveying channel equal to the width of the groove, the friction between the wall of the material conveying channel and the material can be made larger, and the risk of the material being sheared in the groove and accumulating in the groove to form a dead zone can be reduced. If the material accumulates in the groove to form a dead zone, it is equivalent to the groove being filled, which will cause the friction between the wall of the material conveying channel and the material to fluctuate, thereby affecting production efficiency.

[0014] As an optional technical solution of an embodiment of the present application, the number of the grooves is a multiple of 4.

[0015] In the above technical solution, along the circumference of the feed channel, the wall of the feed channel can be evenly divided into four parts, so that the number of grooves in each part is the same. On the one hand, the wall of the feed channel is relatively uniform, and the friction between the material and the wall of the feed channel changes less, which is conducive to the movement of the material to the outlet under the action of the extruder. On the other hand, along the circumference of the feed channel, the grooves have a more balanced effect on the strength of the barrel, making it less likely for the barrel to be damaged due to the strength of one place being significantly weaker than that of other positions.

[0016] As an optional technical solution of the embodiment of the present application, the groove extends along the axial direction of the feed channel.

[0017] In the above technical solution, by making the groove extend along the axial direction of the material delivery channel, on the one hand, it is convenient for the material in the groove to move along the groove toward the outlet. On the other hand, the groove extending along the axial direction of the material delivery channel is easy to process.

[0018] As an optional technical solution of an embodiment of the present application, the groove is a spiral groove arranged on the wall surface of the feed channel.

[0019] In the above technical solution, the groove is a spiral groove, and the material can move toward the outlet along the extension direction of the spiral groove, which increases the friction between the wall of the feeding channel and the material, and is conducive to reducing the sliding between the material and the wall of the feeding channel.

[0020] As an optional technical solution of an embodiment of the present application, the extrusion piece includes an extrusion shaft and a spiral portion, the spiral portion is arranged around the extrusion shaft, and the rotation direction of the spiral portion is opposite to the rotation direction of the spiral groove.

[0021] In the above technical solution, by making the rotation direction of the spiral portion opposite to that of the spiral groove, the material can move more toward the outlet along the extension direction of the spiral groove under the action of the extruder, thereby improving the production efficiency of the extrusion device.

[0022] As an optional technical solution of an embodiment of the present application, the lead angle of the spiral groove is C, which satisfies: 60°≤C<90°, preferably, 70°≤C≤80°.

[0023] In the above technical scheme, different materials have different material properties. During the design, the rise angle of the spiral groove can be selected according to the material to be extruded, thereby further improving the extrusion efficiency of the extrusion device. The harder the material, the larger the rise angle of the selected spiral groove can be. For the extrusion of active substances, a rise angle of 60° to 90° is generally selected. Setting the rise angle of the spiral groove to 60° to 90° (excluding 90°) can allow the material to move along the extension direction of the spiral groove while reducing the risk of the material being sheared by the groove to form a dead zone, thereby improving the extrusion output and stability. When 70°≤C≤80°, the material is more likely to move along the extension direction of the spiral groove and is not easily sheared by the groove.

[0024] As an optional technical solution of an embodiment of the present application, the depth of the groove is H, and the diameter of the feed channel is D, satisfying: 0.01≤H / D≤0.1, preferably, 0.03≤H / D≤0.08.

[0025] In the above technical solution, by limiting the ratio of the depth of the groove to the diameter of the feed channel to 0.01-0.1, the depth of the groove is more appropriate, which can effectively increase the friction between the wall of the feed channel and the material, and will not cause too much impact on the strength of the barrel. When H / D<0.01, the depth of the groove is small, and the effect of increasing the friction between the wall of the feed channel and the material is not obvious. When H / D>0.1, the depth of the groove is too large, which has a greater impact on the strength of the barrel and increases the risk of barrel damage. When 0.03≤H / D≤0.08, the depth of the groove is more appropriate, which can effectively increase the friction between the wall of the feed channel and the material, and will not cause too much impact on the strength of the barrel.

[0026] As an optional technical solution of an embodiment of the present application, along the axial direction of the feed channel, the extrusion component includes a feed section, a compression section and a metering section, the compression section connects the feed section and the metering section, and the feed section is closer to the inlet than the metering section; wherein the groove is arranged at a position of the wall surface corresponding to the feed section.

[0027] In the above technical solution, by arranging the groove at the position of the wall surface corresponding to the feed section, the material entering the feed channel can move quickly toward the outlet under the action of the extruder, and the material reflux amount is small.

[0028] As an optional technical solution of an embodiment of the present application, the extrusion element includes an extrusion shaft and a spiral portion, and the spiral portion is arranged around the extrusion shaft; the diameter of the portion of the extrusion shaft located in the feeding section is smaller than the diameter of the portion of the extrusion shaft located in the metering section, and the diameter of the portion of the extrusion shaft located in the compression section gradually increases in a direction from the feeding section to the metering section.

[0029] In the above technical solution, since the diameter of the portion of the extrusion shaft located in the compression section gradually increases from the direction of the feed section to the metering section, the space between the portion of the extrusion shaft located in the compression section and the barrel gradually decreases from the direction of the feed section to the metering section. In this way, the material will be squeezed when moving from one end of the compression section close to the feed section to the end of the compression section close to the metering section, and the air in the material will be discharged, making the material denser and more uniform.

[0030] As an optional technical solution of an embodiment of the present application, the extrusion member includes an extrusion shaft and a spiral portion, and the spiral portion is arranged around the extrusion shaft; the lead of the portion of the spiral portion located in the feeding section is greater than the lead of the portion of the spiral portion located in the metering section, and the lead of the portion of the spiral portion located in the compression section gradually decreases in a direction from the feeding section to the metering section.

[0031] In the above technical solution, since the lead of the spiral portion located in the compression section gradually decreases in the direction from the feeding section to the metering section, the space between two adjacent teeth on the spiral portion gradually decreases. In this way, the material will be squeezed when moving from one end of the compression section close to the feeding section to the end of the compression section close to the metering section, and the air in the material will be discharged, making the material denser and more uniform.

[0032] As an optional technical solution of an embodiment of the present application, along the axial direction of the material conveying channel, at least one end of the groove is located between the inlet and the outlet.

[0033] In the above technical solution, at least one end of the groove is located between the inlet and the outlet along the axial direction of the feed channel, so that the material entering the feed channel can move quickly toward the outlet under the action of the extruder, which is beneficial to improving the production efficiency of the extrusion device.

[0034] As an optional technical solution of an embodiment of the present application, along the axial direction of the feed channel, the barrel has a first end, the inlet is located between the first end and the outlet, one end of the groove is located between the inlet and the outlet, and the other end of the groove extends to the first end.

[0035] In the above technical solution, one end of the groove is located between the inlet and the outlet, and the other end of the groove extends to the first end, so that the material entering the feeding channel from the inlet can move quickly to the outlet under the action of the extruder. In addition, during manufacturing, the groove can be opened from the first end to the outlet, which is simpler and more convenient to manufacture and is conducive to reducing manufacturing costs.

[0036] As an optional technical solution of an embodiment of the present application, the groove extends from one end of the barrel to the other end of the barrel.

[0037] In the above technical solution, by extending the groove from one end of the barrel to the other end of the barrel, the material has a greater friction with the wall during the entire process of moving from the inlet to the outlet, which is beneficial to reduce the sliding of the material and the wall of the feed channel, so that the material can move more toward the outlet under the action of the extruder, thereby improving the production efficiency of the extrusion device.

[0038] As an optional technical solution of the embodiment of the present application, the roughness of the wall surface of the feed channel is Ra 1 , meet: 0.8μm≤Ra 1 ≤3.2μm, preferably 1.5μm≤Ra 1 ≤2.5μm.

[0039] In the above technical solution, the roughness of the wall of the material delivery channel is limited to 0.8-3.2 μm. The rough wall of the material delivery channel is relatively rough, which is conducive to reducing the sliding between the material and the wall of the material delivery channel, and the resistance to the movement of the material is not too large. 1 When Ra is less than 0.8 μm, the wall of the material delivery channel is relatively smooth, and the material easily slips against the wall of the material delivery channel and is difficult to move to the outlet. 1 When Ra is greater than 3.2μm, the wall of the material delivery channel is too rough, and the resistance to material movement is too large, which is also not conducive to the movement of materials toward the outlet. 1 When the particle size is ≤2.5μm, the wall of the feed channel is relatively rough, which is beneficial to reduce the sliding between the material and the wall of the feed channel, and the resistance to the movement of the material is not too large.

[0040] As an optional technical solution of the embodiment of the present application, the extrusion piece includes an extrusion shaft and a spiral portion, and the spiral portion is arranged around the extrusion shaft; the roughness of the outer peripheral surface of the extrusion shaft is Ra 2 , satisfy: Ra 2 ≤0.4μm, preferably, Ra 2 ≤0.3μm; and / or the surface roughness of the spiral portion is Ra 3 , satisfy: Ra 3 ≤0.4μm, preferably, Ra 3 ≤0.3μm.

[0041] In the above technical solution, when the roughness of the outer peripheral surface of the extrusion shaft is less than or equal to 0.4 μm, the material is not easy to slip in the barrel. The lower the roughness of the outer peripheral surface of the extrusion shaft, the lower the risk of the material slipping in the barrel. When the surface roughness of the spiral portion is less than or equal to 0.4 μm, the material is not easy to slip in the barrel. The lower the roughness of the outer peripheral surface of the extrusion shaft, the lower the risk of the material slipping in the barrel.

[0042] As an optional technical solution of an embodiment of the present application, along the axial direction of the feed channel, the extrusion component includes a feed section, a compression section and a metering section, the compression section connects the feed section and the metering section, and the feed section is closer to the inlet than the metering section.

[0043] In the above technical solution, the space between the feeding section and the barrel is relatively large, the space between the metering section and the barrel is relatively small, and the space between the compression section and the barrel gradually decreases from the end of the compression section close to the feeding section to the end of the compression section close to the metering section, thereby squeezing the material. The metering section can realize the measurement of the volume or mass of the extruded material.

[0044] As an optional technical solution of an embodiment of the present application, the extrusion element includes an extrusion shaft and a spiral portion, and the spiral portion is arranged around the extrusion shaft; the diameter of the portion of the extrusion shaft located in the feeding section is smaller than the diameter of the portion of the extrusion shaft located in the metering section, and the diameter of the portion of the extrusion shaft located in the compression section gradually increases in a direction from the feeding section to the metering section.

[0045] In the above technical solution, since the diameter of the portion of the extrusion shaft located in the compression section gradually increases from the direction of the feed section to the metering section, the space between the portion of the extrusion shaft located in the compression section and the barrel gradually decreases from the direction of the feed section to the metering section. In this way, the material will be squeezed when moving from one end of the compression section close to the feed section to the end of the compression section close to the metering section, and the air in the material will be discharged, making the material denser and more uniform.

[0046] As an optional technical solution of an embodiment of the present application, the extrusion member includes an extrusion shaft and a spiral portion, and the spiral portion is arranged around the extrusion shaft; the lead of the portion of the spiral portion located in the feeding section is greater than the lead of the portion of the spiral portion located in the metering section, and the lead of the portion of the spiral portion located in the compression section gradually decreases in a direction from the feeding section to the metering section.

[0047] In the above technical solution, since the lead of the spiral portion located in the compression section gradually decreases in the direction from the feeding section to the metering section, the space between two adjacent teeth on the spiral portion gradually decreases. In this way, the material will be squeezed when moving from one end of the compression section close to the feeding section to the end of the compression section close to the metering section, and the air in the material will be discharged, making the material denser and more uniform.

[0048] As an optional technical solution of an embodiment of the present application, the barrel includes a first wear-resistant layer, the first wear-resistant layer defines the feed channel, and the groove wall surface of the groove is formed on the first wear-resistant layer.

[0049] In the above technical solution, by providing the first wear-resistant layer, on the one hand, wear can be reduced and the life of the barrel can be increased. On the other hand, the first wear-resistant layer can reduce the risk of metal foreign matter entering the material during the extrusion process, which is conducive to improving product quality.

[0050] As an optional technical solution of an embodiment of the present application, the first wear-resistant layer includes at least one of a tungsten carbide layer and a titanium nitride layer.

[0051] In the above technical solution, the tungsten carbide layer and titanium nitride have good wear resistance and low cost.

[0052] As an optional technical solution of an embodiment of the present application, the extrusion component includes an extrusion shaft and a spiral portion, the spiral portion is arranged around the extrusion shaft; the outer peripheral surface of the extrusion shaft is provided with a second wear-resistant layer; and / or the surface of the spiral portion is provided with a third wear-resistant layer.

[0053] In the above technical solution, by providing the second wear-resistant layer and / or the third wear-resistant layer, on the one hand, wear can be reduced and the life of the extruded part can be increased. On the other hand, the risk of metal foreign matter entering the material due to wear during the extrusion process can be reduced, which is conducive to improving product quality.

[0054] As an optional technical solution of an embodiment of the present application, the barrel includes an inner barrel and an outer barrel, the outer barrel is located outside the inner barrel, the inner barrel and the outer barrel are detachably connected, and the inner barrel defines at least a portion of the feed channel.

[0055] In the above technical solution, by providing an inner cylinder and an outer cylinder, the inner cylinder and the outer cylinder are detachably connected, and the inner cylinder defines a material conveying channel. When the inner cylinder is damaged, the inner cylinder can be replaced separately, thereby reducing the cost of later maintenance. In addition, the grooves of different inner cylinders can be arranged in different forms, so that different inner cylinders can be replaced as needed to adapt to different materials.

[0056] As an optional technical solution of an embodiment of the present application, the inner cylinder includes a first wear-resistant layer, the first wear-resistant layer defines at least a portion of the feed channel, and the groove wall surface of the groove is formed on the first wear-resistant layer.

[0057] In the above technical solution, by providing the first wear-resistant layer on the inner cylinder, on the one hand, wear can be reduced and the life of the inner cylinder can be increased. On the other hand, the first wear-resistant layer can reduce the risk of metal foreign matter entering the material during the extrusion process, which is conducive to improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0059] Figure 1 A schematic diagram of the structure of an extrusion device provided in some embodiments of the present application;

[0060] Figure 2 A cross-sectional view of an extrusion device provided in some embodiments of the present application;

[0061] Figure 3 A schematic side view of a barrel provided for some embodiments of the present application;

[0062] Figure 4 A schematic side view of a barrel provided for other embodiments of the present application;

[0063] Figure 5 A schematic side view of a barrel provided for some other embodiments of the present application;

[0064] Figure 6 A schematic side view of a barrel provided in some further embodiments of the present application;

[0065] Figure 7 A schematic diagram of the structure of a barrel provided in some embodiments of the present application;

[0066] Figure 8 A schematic diagram of the structure of a barrel provided in some other embodiments of the present application;

[0067] Fig. 9 A cross-sectional view of an extrusion device provided in some other embodiments of the present application;

[0068] Fig.10 A schematic diagram of the structure of a barrel provided in some embodiments of the present application;

[0069] Fig.11 A schematic diagram of the structure of a barrel provided in some further embodiments of the present application;

[0070] Fig.12 A cross-sectional view of a barrel provided for some other embodiments of the present application;

[0071] Fig.13 A cross-sectional view of a barrel provided for some further embodiments of the present application.

[0072] Icons: 10-extrusion device; 110-barrel; 111-feeding channel; 1111-inlet; 1112-outlet; 112-first end; 113-outer cylinder; 114-inner cylinder; 200-extrusion piece; 210-extrusion shaft; 220-spiral portion; 230-feeding section; 240-compression section; 250-metering section; 300-groove; 400-driving mechanism; 500-frame. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0074] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0075] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0076] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0077] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0078] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0079] The term "plurality" used in the present application refers to two or more (including two).

[0080] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0081] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells to a certain extent.

[0082] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode ear. The material of the negative electrode collector can be copper, and the negative electrode active material can be carbon or silicon. In order to ensure that a large current does not melt to a certain extent, the number of positive pole ears is multiple and stacked together, and the number of negative pole ears is multiple and stacked together. The material of the isolation film can be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly can be a winding structure or a laminated structure, and the embodiments of the present application are not limited to this.

[0083] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0084] The battery includes an electrode assembly, which is the part where the electrochemical reaction occurs in the battery. The electrode assembly is mainly composed of a positive electrode sheet and a negative electrode sheet wound or stacked. The production efficiency of the electrode sheet has a significant impact on battery production. However, the current production efficiency of the electrode sheet is low.

[0085] In the related art, when manufacturing pole pieces, the active material can be first extruded into a blank through an extrusion device, and then the blank is thinned by rolling to form a diaphragm. Finally, the diaphragm and the substrate are composited to form a pole piece. However, the extrusion device in the related art is generally only used for the extrusion of materials such as plastics and rubber. The properties of active material are very different from those of plastics and rubber. When the extrusion device in the related art is used to extrude the active material, the active material is easy to slip in the extrusion device, which makes the production efficiency of the extrusion device low.

[0086] In view of this, an embodiment of the present application provides an extrusion device, which includes a barrel and an extrusion piece. A feed channel is formed inside the barrel, and the feed channel has an inlet and an outlet. The extrusion piece is at least partially located in the feed channel, and the extrusion piece is used to extrude materials and transport the materials from the inlet to the outlet. A groove is provided on the wall surface of the feed channel, and along the axial direction of the feed channel, the groove is at least partially located between the inlet and the outlet.

[0087] By providing a groove on the wall of the feed channel, and the groove is at least partially located between the inlet and the outlet, the wall of the feed channel is formed with a concave-convex shape, which increases the friction between the wall of the feed channel and the material, which is conducive to reducing the sliding of the material and the wall of the feed channel, so that the material can move more toward the outlet under the action of the extruder, thereby improving the production efficiency of the extrusion device. In addition, since the material can move more toward the outlet under the action of the extruder, it is conducive to increasing the pressure building capacity of the extruder, reducing production capacity fluctuations, and increasing production.

[0088] The technical solution described in the embodiment of the present application is suitable for extruding active material, and the extrusion production efficiency is relatively high.

[0089] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the extrusion device 10 provided in some embodiments of the present application. Figure 2 A cross-sectional view of an extrusion device 10 provided in some embodiments of the present application. The embodiments of the present application provide an extrusion device 10, which includes a barrel 110 and an extrusion piece 200. A feed channel 111 is formed inside the barrel 110, and the feed channel 111 has an inlet 1111 and an outlet 1112. The extrusion piece 200 is at least partially located in the feed channel 111, and the extrusion piece 200 is used to extrude the material and transport the material from the inlet 1111 to the outlet 1112. A groove 300 is provided on the wall surface of the feed channel 111, and along the axial direction of the feed channel 111, the groove 300 is at least partially located between the inlet 1111 and the outlet 1112.

[0090] The barrel 110 is generally cylindrical in structure, and the hollow part of the cylindrical structure is used to contain materials. A material delivery channel 111 is formed inside the barrel 110, and the material delivery channel 111 has an inlet 1111 and an outlet 1112, the inlet 1111 is used for materials to enter the material delivery channel 111, and the outlet 1112 is used for materials to leave the material delivery channel 111.

[0091] The extrusion piece 200 is a component used to extrude materials in cooperation with the barrel 110. A portion of the extrusion piece 200 may be located in the material delivery channel 111, and a portion of the extrusion piece 200 may be located outside the material delivery channel 111. The extrusion piece 200 may also be completely located in the material delivery channel 111.

[0092] The extrusion device 10 further includes a driving mechanism 400 and a frame 500, and the driving mechanism 400 and the barrel 110 are both mounted on the frame 500. The driving mechanism 400 is connected to the extrusion piece 200, and the driving mechanism 400 is used to drive the extrusion piece 200 to rotate and / or move in the feeding channel 111, so that the extrusion piece 200 extrude the material during the rotation and / or movement, discharge the air in the material, make the material more dense and uniform, and transport the material from the inlet 1111 to the outlet 1112. In some embodiments, the driving mechanism 400 includes a rotating driving member, and the rotating driving clamp is connected to the extrusion piece 200, and the rotating driving member is used to drive the extrusion piece 200 to rotate. The rotating driving member can be a motor, an internal combustion engine, etc.

[0093] The groove 300 is a groove structure formed on the wall of the feeding channel 111. In some embodiments, the groove 300 is formed on the inner circumference of the barrel 110. The cross-sectional shape of the groove 300 is not limited. For example, please refer to Figure 3 , Figure 3 The side view of the barrel 110 provided in some embodiments of the present application. The cross-sectional shape of the groove 300 can be rectangular. For example, please refer to Figure 4 , Figure 4 The side view of the barrel 110 provided in some other embodiments of the present application. The cross-sectional shape of the groove 300 can be a triangle. For example, please refer to Figure 5 , Figure 5 The side view of the barrel 110 provided in some embodiments of the present application is shown in FIG. The cross-sectional shape of the groove 300 may be a trapezoid. For example, please refer to Figure 6 , Figure 6 The side view schematic diagram of the barrel 110 provided in some embodiments of the present application. The cross-sectional shape of the groove 300 can be an arc shape.

[0094] In some embodiments, the bottom surface of the groove 300 is flat and smooth, and no protrusions are provided, so as to reduce the risk of material blockage.

[0095] The “axial direction of the feed channel 111” refers to the extending direction of the axis of the feed channel 111. Figure 2 The axial direction of the feed channel 111 can be Figure 2 The X direction in .

[0096] Along the axial direction of the material delivery channel 111 , the groove 300 may be partially located between the inlet 1111 and the outlet 1112 , or the groove 300 may be completely located between the inlet 1111 and the outlet 1112 .

[0097] By providing a groove 300 on the wall of the feed channel 111, and the groove 300 is at least partially located between the inlet 1111 and the outlet 1112, the wall of the feed channel 111 is formed with a concave-convex shape, which increases the friction between the wall of the feed channel 111 and the material, and helps to reduce the sliding between the material and the wall of the feed channel 111, so that the material can move more toward the outlet 1112 under the action of the extruder 200, thereby improving the production efficiency of the extrusion device 10. In addition, since the material can move more toward the outlet 1112 under the action of the extruder 200, it is helpful to increase the pressure building capacity of the extrusion device 10, reduce production capacity fluctuations, and increase production.

[0098] Please refer to Figure 2 and Figure 3 In some embodiments, a plurality of grooves 300 are disposed on the wall surface of the material delivery channel 111. Along the circumference of the material delivery channel 111, the plurality of grooves 300 are disposed at intervals.

[0099] Two grooves 300 , three grooves 300 , four grooves 300 or more than four grooves 300 may be provided on the wall surface of the material conveying channel 111 .

[0100] The “circumferential direction of the feed channel 111” refers to the circumferential direction of the feed channel 111, that is, the direction around the axis of the feed channel 111. The circumferential direction of the feed channel 111 is perpendicular to the axial direction of the feed channel 111. Figure 3 , the circumference of the feed channel 111 can be Figure 3 Y direction shown in .

[0101] The plurality of grooves 300 are arranged at intervals along the circumference of the material delivery channel 111 , and the distance between two adjacent grooves 300 may be constant or variable.

[0102] Along the circumference of the feed channel 111, a plurality of grooves 300 are arranged at intervals on the wall of the feed channel 111 to further increase the friction between the wall of the feed channel 111 and the material and reduce the sliding between the material and the wall of the feed channel 111, so that the material can move more toward the outlet 1112 under the action of the extruder 200, thereby improving the production efficiency of the extrusion device 10.

[0103] Please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, along the circumference of the feeding channel 111 , the distance between two adjacent grooves 300 is A, and the width of the groove 300 is B, satisfying: 0.7≤A / B≤1.3.

[0104] A represents the distance between two adjacent grooves 300 along the circumferential direction of the material conveying channel 111 . During measurement, the minimum arc length between the opening end of one groove 300 and the opening end of another groove 300 may be measured.

[0105] B represents the width of the groove 300 , and during measurement, the width of the opening end of the groove 300 may be measured.

[0106] Along the circumference of the feeding channel 111 , the ratio of the distance between two adjacent grooves 300 and the width of the groove 300 may be: A / B=0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, etc.

[0107] By making the ratio of the spacing between two adjacent grooves 300 along the circumference of the feed channel 111 to the width of the groove 300 within the range of 0.7 to 1.3, the spacing between two adjacent grooves 300 along the circumference of the feed channel 111 is close to the groove width of the groove 300, which can not only make the friction between the wall of the feed channel 111 and the material larger, but also reduce the risk of the material being sheared in the groove 300 and accumulating in the groove 300 to form a dead zone. If the material accumulates in the groove 300 to form a dead zone, it is equivalent to the groove 300 being filled, which will cause the friction between the wall of the feed channel 111 and the material to fluctuate, thereby affecting the production efficiency. When A / B<0.7, the groove width of the groove 300 is too large, and along the circumference of the feed channel 111, the number of grooves 300 that can be set is small, so that the friction between the wall of the feed channel 111 and the material is small. When A / B>1.3, the groove width of the groove 300 is too small, and the material is easily cut by the groove 300, and the risk of accumulating in the groove 300 to form a dead zone increases.

[0108] In some embodiments, 0.9≤A / B≤1.1.

[0109] Along the circumference of the feeding channel 111 , the ratio of the distance between two adjacent grooves 300 and the width of the groove 300 may be: A / B=0.9, 0.92, 0.95, 0.98, 1, 1.02, 1.05, 1.08, 1.1, etc.

[0110] When 0.9≤A / B≤1.1, the circumferential spacing between two adjacent grooves 300 along the feed channel 111 is closer to the groove width of the groove 300, which can not only increase the friction between the wall of the feed channel 111 and the material, but also reduce the risk of the material being sheared in the groove 300 and accumulating in the groove 300 to form a dead zone.

[0111] Please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, a plurality of grooves 300 are arranged at equal intervals along the circumference of the feed channel 111 .

[0112] “A plurality of grooves 300 are arranged at equal intervals along the circumference of the material delivery channel 111 ” means that a plurality of grooves 300 are arranged at equal intervals along the circumference of the material delivery channel 111 and the intervals between every two adjacent grooves 300 are equal.

[0113] By arranging the plurality of grooves 300 at equal intervals along the circumference of the feed channel 111, the wall surface of the feed channel 111 is uniformly concave and convex, and the friction between the material and the wall surface of the feed channel 111 changes less, which is conducive to the movement of the material to the outlet 1112 under the action of the extruder 200. In addition, by arranging the plurality of grooves 300 at equal intervals along the circumference of the feed channel 111, the grooves 300 have a more balanced effect on the strength of the barrel 110 along the circumference of the feed channel 111, so that the barrel 110 is not easily damaged due to the strength of a certain position being significantly weaker than that of other positions.

[0114] Please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, along the circumference of the feed channel 111 , the width of the groove 300 is equal to the distance between two adjacent grooves 300 .

[0115] Along the circumferential direction of the material conveying channel 111 , the distance between two adjacent grooves 300 is A, and the width of the groove 300 is B, so A=B, or A / B=1.

[0116] By making the distance between two adjacent grooves 300 along the circumferential direction of the material delivery channel 111 equal to the width of the groove 300, the friction between the wall of the material delivery channel 111 and the material can be made larger, and the risk of the material being sheared in the groove 300 and accumulating in the groove 300 to form a dead zone can be reduced. If the material accumulates in the groove 300 to form a dead zone, it is equivalent to the groove 300 being filled, which will cause the friction between the wall of the material delivery channel 111 and the material to fluctuate, thereby affecting production efficiency.

[0117] In some embodiments, the number of grooves 300 is a multiple of four.

[0118] The number of the grooves 300 may be 4, 8, 12, etc.

[0119] Please refer to Figure 3 , Figure 5 and Figure 6 ,exist Figure 3 , Figure 5 and Figure 6 In the embodiment shown, the number of the grooves 300 is 8. Figure 4 ,exist Figure 4 In the illustrated embodiment, there are twelve grooves 300 .

[0120] Along the circumference of the feed channel 111, the wall of the feed channel 111 can be evenly divided into four parts, so that the number of grooves 300 in each part is the same. On the one hand, the wall of the feed channel 111 is relatively uniform, and the friction between the material and the wall of the feed channel 111 changes less, which is conducive to the material moving to the outlet 1112 under the action of the extruder 200. On the other hand, along the circumference of the feed channel 111, the grooves 300 have a more balanced effect on the strength of the barrel 110, so that the barrel 110 is not easily damaged due to the strength of one place being significantly weaker than that of other places.

[0121] Please refer to Figure 2 and Figure 7 , Figure 7 The schematic diagram of the structure of the barrel 110 provided in some embodiments of the present application. In some embodiments, the groove 300 extends along the axial direction of the material delivery channel 111.

[0122] “The groove 300 extends along the axial direction of the material conveying channel 111 ” means that the groove 300 is a linear groove, and the linear groove extends along the axial direction of the material conveying channel 111 .

[0123] By making the groove 300 extend along the axial direction of the material delivery channel 111, on the one hand, it is convenient for the material in the groove 300 to move along the groove 300 toward the outlet 1112. On the other hand, the groove 300 extending along the axial direction of the material delivery channel 111 is convenient for processing.

[0124] Please refer to Figure 8 , Figure 8 The schematic diagram of the structure of the barrel 110 provided in some other embodiments of the present application. In some other embodiments, the groove 300 is a spiral groove provided on the wall surface of the feeding channel 111.

[0125] The groove 300 is a spiral groove extending along a spiral track, and the spiral track is arranged around the axis of the material delivery channel 111. Optionally, the center line of the spiral track coincides with the axis of the material delivery channel 111.

[0126] The groove 300 is a spiral groove, and the material can move toward the outlet 1112 along the extension direction of the spiral groove, which increases the friction between the wall of the feeding channel 111 and the material, and helps to reduce the sliding between the material and the wall of the feeding channel 111.

[0127] Please refer to Figure 2 and Figure 8 In some embodiments, the extrusion member 200 includes an extrusion shaft 210 and a spiral portion 220, and the spiral portion 220 is disposed around the extrusion shaft 210. The hand direction of the spiral portion 220 is opposite to the hand direction of the spiral groove.

[0128] The extrusion shaft 210 is a shaft structure, and the spiral portion 220 is a spiral structure. The spiral portion 220 is connected to the outer peripheral surface of the extrusion shaft 210 and is arranged around the axis of the extrusion shaft 210. The extrusion element 200 can be a screw, and in this case, the spiral portion 220 is a screw rib of the screw. When the extrusion element 200 rotates, the material moves from the inlet 1111 to the outlet 1112 under the push of the spiral portion 220.

[0129] The hand direction of the spiral portion 220 is opposite to the hand direction of the spiral groove. For example, when the hand direction of the spiral portion 220 is right-handed, the hand direction of the spiral groove is left-handed. For another example, when the hand direction of the spiral portion 220 is left-handed, the hand direction of the spiral groove is right-handed.

[0130] By making the rotation direction of the spiral portion 220 opposite to that of the spiral groove, the material can move more toward the outlet 1112 along the extension direction of the spiral groove under the action of the extruder 200, thereby improving the production efficiency of the extrusion device 10.

[0131] In some embodiments, the lead angle of the spiral groove is C, satisfying: 60°≤C<90°.

[0132] The spiral groove extends along the spiral track, and the lead angle of the spiral groove refers to the angle between the tangent line of the spiral track and the plane perpendicular to the center line of the spiral track.

[0133] The lead angle of the spiral groove can be: C=60°, 65°, 70°, 75°, 80°, 85°, etc.

[0134] Different materials have different material properties. During design, the rise angle of the spiral groove can be selected according to the material to be extruded, thereby further improving the extrusion efficiency of the extrusion device 10. The harder the material, the larger the rise angle of the selected spiral groove can be. For the extrusion of active substances, a rise angle of 60° to 90° is generally selected. Setting the rise angle of the spiral groove to 60° to 90° (excluding 90°) can allow the material to move along the extension direction of the spiral groove while reducing the risk of the material being sheared by the groove 300 to form a dead zone, thereby improving the output and stability of the extrusion.

[0135] In some embodiments, 70°≤C≤80°.

[0136] The lead angle of the spiral groove can be: C = 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, 80°, etc.

[0137] When 70°≤C≤80°, the material is more likely to move along the extension direction of the spiral groove and is not easily sheared by the groove 300 .

[0138] Please refer again Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, the depth of the groove 300 is H, and the diameter of the feed channel 111 is D, satisfying: 0.01≤H / D≤0.1.

[0139] H represents the depth of the groove 300 . During measurement, the maximum distance between the opening end and the bottom of the groove 300 can be measured.

[0140] D represents the diameter of the material delivery channel 111 . During measurement, the diameter corresponding to the position of the material delivery channel 111 where the groove 300 is not provided can be measured.

[0141] The ratio of the depth of the groove 300 to the diameter of the feeding channel 111 may be: H / D=0.01, 0.03, 0.05, 0.07, 0.09, 0.1, etc.

[0142] By limiting the ratio of the depth of the groove 300 to the diameter of the feed channel 111 to 0.01-0.1, the depth of the groove 300 is appropriate, which can effectively increase the friction between the wall of the feed channel 111 and the material, and will not have a significant impact on the strength of the barrel 110. When H / D < 0.01, the depth of the groove 300 is small, and the effect of increasing the friction between the wall of the feed channel 111 and the material is not obvious. When H / D > 0.1, the depth of the groove 300 is too large, which has a greater impact on the strength of the barrel 110, and the risk of damage to the barrel 110 increases.

[0143] In some embodiments, 0.03≤H / D≤0.08.

[0144] The ratio of the depth of the groove 300 to the diameter of the feeding channel 111 may be: H / D=0.03, 0.04, 0.05, 0.06, 0.07, 0.08, etc.

[0145] When 0.03≤H / D≤0.08, the depth of the groove 300 is more appropriate, which can effectively increase the friction between the wall of the feeding channel 111 and the material, and will not have a great impact on the strength of the barrel 110.

[0146] Please refer to Figure 2 , Figure 7 and Figure 8 In some embodiments, along the axial direction of the feed channel 111, the extrusion piece 200 includes a feed section 230, a compression section 240 and a metering section 250. The compression section 240 connects the feed section 230 and the metering section 250, and the feed section 230 is closer to the inlet 1111 than the metering section 250. The groove 300 is arranged at a position of the wall surface corresponding to the feed section 230.

[0147] The feed section 230 is a portion of the extrusion element 200 corresponding to the inlet 1111. After the material enters the feed channel 111 from the inlet 1111, it can move toward the outlet 1112 under the action of the feed section 230. The space between the feed section 230 and the wall of the feed channel 111 is larger than the space between the metering section 250 and the wall of the feed channel 111.

[0148] The compression section 240 is a portion of the extruder 200 for extruding materials. The space between the compression section 240 and the barrel 110 gradually decreases from one end of the compression section 240 close to the feed section 230 to one end of the compression section 240 close to the metering section 250, thereby extruding the materials.

[0149] The metering section 250 is a part used to measure the volume or mass of the extruded material. Along the axial direction of the feeding channel 111, the space between the metering section 250 and the inner wall of the feeding channel 111 is consistent at different positions of the metering section 250. In this way, the volume or mass of the extruded material is constant every time the extrusion member 200 rotates one circle, so the extruded material can be measured.

[0150] Since the space between the feed section 230 and the wall of the feed channel 111 is larger than the space between the metering section 250 and the wall of the feed channel 111, and the pressure of the material at the position corresponding to the feed section 230 is smaller, and the pressure of the material at the position corresponding to the metering section 250 is larger. By setting the groove 300 at the position of the wall corresponding to the feed section 230, the material is not easy to flow back from the gap between the spiral part 220 and the wall to the position close to the inlet 1111. By setting the groove 300 at the position of the wall corresponding to the metering section 250, the material is relatively easy to flow back from the gap between the spiral part 220 and the wall to the position close to the inlet 1111 under the action of pressure.

[0151] By arranging the groove 300 at a position on the wall corresponding to the feed section 230 , the material entering the feed channel 111 can be quickly moved toward the outlet 1112 under the action of the extruder 200 , and the amount of material reflux is small.

[0152] Please refer to Figure 2 , Figure 7 and Figure 8 In some embodiments, the extrusion element 200 includes an extrusion shaft 210 and a spiral portion 220, and the spiral portion 220 is arranged around the extrusion shaft 210. The diameter of the portion of the extrusion shaft 210 located in the feeding section 230 is smaller than the diameter of the portion of the extrusion shaft 210 located in the metering section 250, and the diameter of the portion of the extrusion shaft 210 located in the compression section 240 gradually increases from the feeding section 230 to the metering section 250.

[0153] Along the axial direction of the feed channel 111, the diameters of the extrusion shaft 210 at various positions on the feed section 230 are equal, and the diameters of the extrusion shaft 210 at various positions on the metering section 250 are equal. The diameter of the portion of the extrusion shaft 210 at the feed section 230 is smaller than the diameter of the portion of the extrusion shaft 210 at the metering section 250, so that the space between the feed section 230 and the wall of the feed channel 111 is larger than the space between the metering section 250 and the wall of the feed channel 111.

[0154] The diameter of the portion of the extrusion shaft 210 located in the compression section 240 gradually increases from the direction of the feed section 230 to the metering section 250, and gradually decreases from the direction of the metering section 250 to the feed section 230, so that the space between the portion of the extrusion shaft 210 located in the compression section 240 and the barrel 110 gradually decreases from the direction of the feed section 230 to the metering section 250.

[0155] In some embodiments, the extrusion element 200 is a variable diameter screw.

[0156] Since the diameter of the portion of the extrusion shaft 210 located in the compression section 240 gradually increases in the direction from the feed section 230 to the metering section 250, the space between the portion of the extrusion shaft 210 located in the compression section 240 and the barrel 110 gradually decreases in the direction from the feed section 230 to the metering section 250. In this way, the material will be squeezed when moving from one end of the compression section 240 close to the feed section 230 to the other end of the compression section 240 close to the metering section 250, and the air in the material will be discharged, making the material denser and more uniform.

[0157] Please refer to Fig. 9 , Fig. 9 The cross-sectional view of the extrusion device 10 provided in some other embodiments of the present application. In other embodiments, the extrusion member 200 includes an extrusion shaft 210 and a spiral portion 220, and the spiral portion 220 is arranged around the extrusion shaft 210. The lead of the portion of the spiral portion 220 located in the feeding section 230 is greater than the lead of the portion of the spiral portion 220 located in the metering section 250, and the lead of the portion of the spiral portion 220 located in the compression section 240 gradually decreases in the direction from the feeding section 230 to the metering section 250.

[0158] The lead refers to the axial distance between adjacent corresponding points on the spiral portion 220 .

[0159] The lead of the portion of the spiral portion 220 located in the feed section 230 is constant, and the lead of the portion of the spiral portion 220 located in the metering section 250 is also constant, but the lead of the portion of the spiral portion 220 located in the feed section 230 is greater than the lead of the portion of the spiral portion 220 located in the metering section 250, so that the space between the feed section 230 and the wall of the feed channel 111 is larger than the space between the metering section 250 and the wall of the feed channel 111.

[0160] The lead of the spiral portion 220 located in the compression section 240 gradually decreases in the direction from the feed section 230 to the metering section 250, and gradually increases in the direction from the metering section 250 to the feed section 230, so that the lead between two adjacent teeth on the spiral portion 220 of the extrusion shaft 210 located in the compression section 240 gradually decreases in the direction from the feed section 230 to the metering section 250.

[0161] Since the lead of the spiral portion 220 located in the compression section 240 gradually decreases in the direction from the feeding section 230 to the metering section 250, the space between two adjacent teeth on the spiral portion 220 gradually decreases. In this way, the material will be squeezed when moving from one end of the compression section 240 close to the feeding section 230 to the other end of the compression section 240 close to the metering section 250, and the air in the material will be discharged, making the material denser and more uniform.

[0162] Please refer to Figure 7 , Figure 8 and Fig. 9 In some embodiments, along the axial direction of the material delivery channel 111 , at least one end of the groove 300 is located between the inlet 1111 and the outlet 1112 .

[0163] Along the axial direction of the material delivery channel 111 , only one end of the groove 300 may be located between the inlet 1111 and the outlet 1112 , or the groove 300 may be completely located between the inlet 1111 and the outlet 1112 .

[0164] At least one end of the groove 300 is located between the inlet 1111 and the outlet 1112 along the axial direction of the feed channel 111 , so that the material entering the feed channel 111 can move quickly toward the outlet 1112 under the action of the extruder 200 , which is beneficial to improving the production efficiency of the extrusion device 10 .

[0165] Please refer to Figure 7 , Figure 8 and Fig. 9 In some embodiments, along the axial direction of the feeding channel 111, the barrel 110 has a first end 112, and the inlet 1111 is located between the first end 112 and the outlet 1112. One end of the groove 300 is located between the inlet 1111 and the outlet 1112, and the other end of the groove 300 extends to the first end 112.

[0166] The first end 112 is an end of the barrel 110 away from the outlet 1112 . Generally speaking, the driving mechanism 400 is disposed at the first end 112 . The driving mechanism 400 is connected to the extrusion piece 200 at the first end 112 to drive the extrusion piece 200 to rotate and / or move.

[0167] The inlet 1111 is located between the first end 112 and the outlet 1112 , and the inlet 1111 may penetrate the outer circumference and the inner circumference of the barrel 110 .

[0168] “One end of the groove 300 is located between the inlet 1111 and the outlet 1112 , and the other end of the groove 300 extends to the first end 112 ” can also be understood as: the groove 300 extends from the first end 112 toward the outlet 1112 , exceeds the position of the inlet 1111 , and there is a gap between the groove 300 and the outlet 1112 .

[0169] One end of the groove 300 is located between the inlet 1111 and the outlet 1112, and the other end of the groove 300 extends to the first end 112, so that the material entering the feeding channel 111 from the inlet 1111 can quickly move to the outlet 1112 under the action of the extruder 200. In addition, during manufacturing, the groove 300 can be opened from the first end 112 to the outlet 1112, which makes manufacturing simpler and more convenient, and is conducive to reducing manufacturing costs.

[0170] Please refer to Fig.10 and Fig.11 , Fig.10 This is a schematic structural diagram of a barrel 110 provided in some other embodiments of the present application. Fig.11 The schematic diagram of the structure of the barrel 110 provided in some embodiments of the present application. In some embodiments, the groove 300 extends from one end of the barrel 110 to the other end of the barrel 110.

[0171] “The groove 300 extends from one end of the barrel 110 to the other end of the barrel 110 ” may also be understood as: the groove 300 extends from the first end 112 to the end where the outlet 1112 is located.

[0172] By extending the groove 300 from one end of the barrel 110 to the other end of the barrel 110, the material has a greater friction with the wall during the entire process of moving from the inlet 1111 to the outlet 1112, which is beneficial to reduce the sliding of the material and the wall of the feed channel 111, so that the material can move more toward the outlet 1112 under the action of the extruder 200, thereby improving the production efficiency of the extrusion device 10.

[0173] In some embodiments, the roughness of the wall of the feeding channel 111 is Ra 1 , meet: 0.8μm≤Ra 1 ≤3.2μm.

[0174] Roughness refers to the unevenness of the machined surface with small spacing and tiny peaks and valleys. The distance (wave distance) between two peaks or two valleys is very small (less than 1mm), which belongs to the microscopic geometric shape error. The smaller the surface roughness, the smoother the surface.

[0175] The roughness of the wall of the feeding channel 111 can be Ra 1=0.8μm, 1μm, 1.2μm, 1.5μm, 1.8μm, 2μm, 2.2μm, 2.5μm, 2.8μm, 3μm, 3.2μm, etc.

[0176] The roughness of the wall of the material delivery channel 111 is limited to 0.8-3.2 μm. The rough wall of the material delivery channel 111 is relatively rough, which is beneficial to reduce the sliding between the material and the wall of the material delivery channel 111, and the resistance to the movement of the material is not too large. 1 When Ra is less than 0.8 μm, the wall of the material delivery channel 111 is relatively smooth, and the material easily slips on the wall of the material delivery channel 111, and is difficult to move to the outlet 1112. 1 When the particle size is greater than 3.2 μm, the wall surface of the material conveying channel 111 is too rough, and the resistance to the movement of the material is too large, which is also not conducive to the movement of the material toward the outlet 1112 .

[0177] In some embodiments, 1.5 μm ≤ Ra 1 ≤2.5μm.

[0178] The roughness of the wall of the feeding channel 111 can be Ra 1 =1.5μm, 1.6μm, 1.7μm, 1.8μm, 1.9μm, 2μm, 2.1μm, 2.2μm, 2.3μm, 2.4μm, 2.5μm, etc.

[0179] When 1.5μm≤Ra 1 When the thickness is ≤2.5 μm, the wall surface of the material delivery channel 111 is relatively rough, which is beneficial to reduce the sliding between the material and the wall surface of the material delivery channel 111, and the resistance to the movement of the material is not too large.

[0180] Please refer to Fig. 9 In some embodiments, the extrusion member 200 includes an extrusion shaft 210 and a spiral portion 220, and the spiral portion 220 is arranged around the extrusion shaft 210. The roughness of the outer peripheral surface of the extrusion shaft 210 is Ra 2 , satisfy: Ra 2 ≤0.4μm.

[0181] The roughness of the outer peripheral surface of the extrusion shaft 210 can be Ra 2 =0.4μm, 0.38μm, 0.35μm, 0.32μm, 0.3μm, 0.28μm, 0.25μm, 0.22μm, 0.2μm, etc.

[0182] In some embodiments, Ra 2 ≤0.3μm.

[0183] When the roughness of the outer circumferential surface of the extrusion shaft 210 is less than or equal to 0.4 μm, the material is not easy to slip in the barrel 110. The lower the roughness of the outer circumferential surface of the extrusion shaft 210, the lower the risk of the material slipping in the barrel 110.

[0184] In some embodiments, the surface roughness of the spiral portion 220 is Ra 3 , satisfy: Ra 3 ≤0.4μm.

[0185] The surface roughness of the spiral portion 220 may be Ra 3 =0.4μm, 0.38μm, 0.35μm, 0.32μm, 0.3μm, 0.28μm, 0.25μm, 0.22μm, 0.2μm, etc.

[0186] In some embodiments, Ra 3 ≤0.3μm.

[0187] When the surface roughness of the spiral portion 220 is less than or equal to 0.4 μm, the material is not likely to slip in the barrel 110. The lower the roughness of the outer circumferential surface of the extrusion shaft 210, the lower the risk of the material slipping in the barrel 110.

[0188] Please refer to Figure 2 and Fig. 9 In some embodiments, along the axial direction of the feed channel 111, the extrusion piece 200 includes a feed section 230, a compression section 240 and a metering section 250, and the compression section 240 connects the feed section 230 and the metering section 250. The feed section 230 is closer to the inlet 1111 than the metering section 250.

[0189] The space between the feeding section 230 and the barrel 110 is relatively large, the space between the metering section 250 and the barrel 110 is reduced, and the space between the compression section 240 and the barrel 110 is gradually reduced from the end of the compression section 240 close to the feeding section 230 to the end of the compression section 240 close to the metering section 250, thereby squeezing the material. The metering section 250 can measure the volume or mass of the extruded material.

[0190] Please refer to Figure 2 In some embodiments, the extrusion element 200 includes an extrusion shaft 210 and a spiral portion 220, and the spiral portion 220 is arranged around the extrusion shaft 210. The diameter of the portion of the extrusion shaft 210 located in the feeding section 230 is smaller than the diameter of the portion of the extrusion shaft 210 located in the metering section 250, and the diameter of the portion of the extrusion shaft 210 located in the compression section 240 gradually increases from the feeding section 230 to the metering section 250.

[0191] Since the diameter of the portion of the extrusion shaft 210 located in the compression section 240 gradually increases in the direction from the feed section 230 to the metering section 250, the space between the portion of the extrusion shaft 210 located in the compression section 240 and the barrel 110 gradually decreases in the direction from the feed section 230 to the metering section 250. In this way, the material will be squeezed when moving from one end of the compression section 240 close to the feed section 230 to the other end of the compression section 240 close to the metering section 250, and the air in the material will be discharged, making the material denser and more uniform.

[0192] Please refer to Fig. 9 The extrusion member 200 includes an extrusion shaft 210 and a spiral portion 220, and the spiral portion 220 is arranged around the extrusion shaft 210. The lead of the portion of the spiral portion 220 located in the feeding section 230 is greater than the lead of the portion of the spiral portion 220 located in the metering section 250, and the lead of the portion of the spiral portion 220 located in the compression section 240 gradually decreases in the direction from the feeding section 230 to the metering section 250.

[0193] Since the lead of the spiral portion 220 located in the compression section 240 gradually decreases in the direction from the feeding section 230 to the metering section 250, the space between two adjacent teeth on the spiral portion 220 gradually decreases. In this way, the material will be squeezed when moving from one end of the compression section 240 close to the feeding section 230 to the other end of the compression section 240 close to the metering section 250, and the air in the material will be discharged, making the material denser and more uniform.

[0194] In some embodiments, the barrel 110 includes a first wear-resistant layer, and the first wear-resistant layer defines a material delivery channel 111. The groove wall surface of the groove 300 is formed in the first wear-resistant layer.

[0195] The wear resistance of the first wear-resistant layer is stronger than that of the barrel 110. Wear resistance refers to the wear resistance of a material, which is expressed by abrasion loss or wear resistance index. Wear resistance is also called abrasion resistance. Wear resistance is related to almost all properties of a material.

[0196] The first wear-resistant layer may be disposed on the inner circumference of the barrel 110 . In this case, the first wear-resistant layer defines the material delivery channel 111 , rather than the inner circumference of the barrel 110 defining the material delivery channel 111 .

[0197] “The groove wall surface of the groove 300 is formed on the first wear-resistant layer” means that the groove 300 is opened in the first wear-resistant layer, which can also be understood as the first wear-resistant layer is provided on the groove wall surface of the groove 300 .

[0198] By providing the wear-resistant layer, on the one hand, it is possible to reduce wear and tear and increase the life of the barrel 110. On the other hand, the first wear-resistant layer can reduce the risk of metal foreign matter entering the material due to wear during the extrusion process, which is beneficial to improving product quality.

[0199] In some embodiments, the first wear resistant layer includes at least one of a tungsten carbide layer and a titanium nitride layer.

[0200] Tungsten carbide layer and titanium nitride have good wear resistance and low cost.

[0201] In some embodiments, the extrusion member 200 includes an extrusion shaft 210 and a spiral portion 220, and the spiral portion 220 is disposed around the extrusion shaft 210. The outer peripheral surface of the extrusion shaft 210 is provided with a second wear-resistant layer, and / or the surface of the spiral portion 220 is provided with a third wear-resistant layer.

[0202] The wear resistance of the second wear-resistant layer is stronger than that of the extrusion shaft 210 . The wear resistance of the third wear-resistant layer is stronger than that of the spiral portion 220 .

[0203] The second wear-resistant layer may include at least one of a tungsten carbide layer and a titanium nitride layer. The third wear-resistant layer may also include at least one of a tungsten carbide layer and a titanium nitride layer.

[0204] By providing the second wear-resistant layer and / or the third wear-resistant layer, on the one hand, wear can be reduced and the life of the extruded component 200 can be increased. On the other hand, the risk of metal foreign matter entering the material due to wear during the extrusion process can be reduced, which is conducive to improving product quality.

[0205] Please refer to Fig.12 and Fig.13 In some embodiments, the barrel 110 includes an inner barrel 114 and an outer barrel 113, wherein the outer barrel 113 is located outside the inner barrel 114, and the inner barrel 114 and the outer barrel 113 are detachably connected. The inner barrel 114 defines at least a portion of the material delivery channel 111.

[0206] The inner cylinder 114 and the outer cylinder 113 are both cylindrical structures with openings at both ends. The inner cylinder 114 is located inside the outer cylinder 113. The inner cylinder 114 and the outer cylinder 113 are detachably connected, for example, the outer cylinder 113 is sleeved on the outer side of the inner cylinder 114, so that the inner cylinder 114 and the outer cylinder 113 can be detachably separated.

[0207] Please refer to Fig.12 ,exist Fig.12 In the illustrated embodiment, along the axial direction of the feed channel 111 , the length of the inner cylinder 114 is smaller than the length of the outer cylinder 113 , the inner cylinder 114 partially blocks the inner circumferential surface of the outer cylinder 113 , the inner cylinder 114 defines a portion of the feed channel 111 , and the outer cylinder 113 defines another portion of the feed channel 111 .

[0208] Please refer to Fig.13 ,exist Fig.13 In the illustrated embodiment, along the axial direction of the material delivery channel 111 , the length of the inner cylinder 114 is greater than or equal to the length of the outer cylinder 113 , the inner cylinder 114 completely covers the inner circumference of the outer cylinder 113 , and the inner cylinder 114 defines the material delivery channel 111 .

[0209] By providing the inner cylinder 114 and the outer cylinder 113, the inner cylinder 114 and the outer cylinder 113 are detachably connected, and the inner cylinder 114 defines the material delivery channel 111. When the inner cylinder 114 is damaged, the inner cylinder 114 can be replaced separately, thereby reducing the cost of later maintenance. In addition, the grooves 300 of different inner cylinders 114 can be arranged in different forms, so that different inner cylinders 114 can be replaced as needed to adapt to different materials.

[0210] Please refer to Fig.12 and Fig.13 In some embodiments, the inner cylinder 114 includes a first wear-resistant layer, and the first wear-resistant layer defines at least a portion of the material delivery channel 111. The groove wall surface of the groove 300 is formed on the first wear-resistant layer.

[0211] Please refer to Fig.12 ,exist Fig.12 In the illustrated embodiment, along the axial direction of the material delivery channel 111, the length of the inner cylinder 114 is less than the length of the outer cylinder 113, and the inner cylinder 114 partially blocks the inner circumference of the outer cylinder 113. At this time, a first wear-resistant layer may be provided on the inner circumference of the inner cylinder 114, and the first wear-resistant layer provided on the inner circumference of the inner cylinder 114 defines a part of the material delivery channel 111. Of course, the first wear-resistant layer may also be provided on the inner circumference of the outer cylinder 113, and the first wear-resistant layer provided on the inner circumference of the outer cylinder 113 defines another part of the material delivery channel 111.

[0212] In some embodiments, the feed section 230 is accommodated in the inner cylinder 114 , and the compression section 240 and the metering section 250 are both located outside the inner cylinder 114 but inside the outer cylinder 113 .

[0213] Please refer to Fig.13 ,exist Fig.13 In the illustrated embodiment, along the axial direction of the material delivery channel 111, the length of the inner cylinder 114 is greater than or equal to the length of the outer cylinder 113, and the inner cylinder 114 completely covers the inner circumference of the outer cylinder 113. At this time, a first wear-resistant layer may be provided on the inner circumference of the inner cylinder 114, and the first wear-resistant layer provided on the inner circumference of the inner cylinder 114 defines the material delivery channel 111.

[0214] In some embodiments, the extrusion 200 is housed within the inner barrel 114 .

[0215] By providing the first wear-resistant layer on the inner cylinder 114, on the one hand, wear can be reduced and the life of the inner cylinder 114 can be increased. On the other hand, the first wear-resistant layer can reduce the risk of metal foreign matter entering the material during the extrusion process, which is conducive to improving product quality.

[0216] The extrusion device 10 provided in some embodiments of the present application has a compression ratio of 1.5 to 3, so that the active material can be squeezed densely, and the formed blank can be transmitted through rollers with good quality.

[0217] According to some embodiments of this application, please refer to Figures 1 to 9 .

[0218] The embodiment of the present application provides an extrusion device 10, which includes a barrel 110 and an extrusion piece 200. A feed channel 111 is formed inside the barrel 110, and the feed channel 111 has an inlet 1111 and an outlet 1112. The extrusion piece 200 is at least partially located in the feed channel 111, and the extrusion piece 200 is used to extrude materials and transport the materials from the inlet 1111 to the outlet 1112. A groove 300 is provided on the wall surface of the feed channel 111, and the groove 300 is at least partially located between the inlet 1111 and the outlet 1112 along the axial direction of the feed channel 111. By providing a groove 300 on the wall of the feed channel 111, and the groove 300 is at least partially located between the inlet 1111 and the outlet 1112, the wall of the feed channel 111 is formed with a concave-convex shape, which increases the friction between the wall of the feed channel 111 and the material, and helps to reduce the sliding between the material and the wall of the feed channel 111, so that the material can move more toward the outlet 1112 under the action of the extruder 200, thereby improving the production efficiency of the extrusion device 10. In addition, since the material can move more toward the outlet 1112 under the action of the extruder 200, it is helpful to increase the pressure building capacity of the extrusion device 10, reduce production capacity fluctuations, and increase production.

[0219] A plurality of grooves 300 are arranged on the wall surface of the feed channel 111, and the plurality of grooves 300 are arranged at equal intervals along the circumference of the feed channel 111. Along the circumference of the feed channel 111, the width of the groove 300 is equal to the spacing between two adjacent grooves 300. By arranging the plurality of grooves 300 at equal intervals along the circumference of the feed channel 111, the wall surface of the feed channel 111 is uniformly concave and convex, and the friction between the material and the wall surface of the feed channel 111 changes less, which is conducive to the movement of the material to the outlet 1112 under the action of the extruder 200. In addition, by arranging the plurality of grooves 300 at equal intervals along the circumference of the feed channel 111, the grooves 300 have a more balanced effect on the strength of the barrel 110 along the circumference of the feed channel 111, so that the barrel 110 is not easily damaged due to the strength of a certain position being significantly weaker than that of other positions. By making the distance between two adjacent grooves 300 along the circumferential direction of the material delivery channel 111 equal to the width of the groove 300, the friction between the wall of the material delivery channel 111 and the material can be made larger, and the risk of the material being sheared in the groove 300 and accumulating in the groove 300 to form a dead zone can be reduced. If the material accumulates in the groove 300 to form a dead zone, it is equivalent to the groove 300 being filled, which will cause the friction between the wall of the material delivery channel 111 and the material to fluctuate, thereby affecting production efficiency.

[0220] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An extrusion device, characterized in that: include: A barrel, wherein a material delivery channel is formed inside, and the material delivery channel has an inlet and an outlet; an extrusion member, at least partly located in the material delivery channel, the extrusion member being used to extrude the material and convey the material from the inlet to the outlet; Wherein, a groove is arranged on the wall surface of the material conveying channel, and along the axial direction of the material conveying channel, the groove is at least partially located between the inlet and the outlet.

2. The extrusion device according to claim 1, characterized in that: A plurality of the grooves are arranged on the wall surface of the material conveying channel, and the plurality of the grooves are arranged at intervals along the circumference of the material conveying channel.

3. The extrusion device according to claim 2, characterized in that: Along the circumferential direction of the feed channel, the distance between two adjacent grooves is A, and the width of the groove is B, which satisfies: 0.7≤A / B≤1.3, preferably, 0.9≤A / B≤1.

1.

4. The extrusion device according to claim 2, characterized in that: Along the circumference of the material conveying channel, a plurality of grooves are arranged at equal intervals.

5. The extrusion device according to claim 4, characterized in that: Along the circumference of the material conveying channel, the width of the groove is equal to the distance between two adjacent grooves.

6. The extrusion device according to claim 2, characterized in that: The number of the grooves is a multiple of 4.

7. The extrusion device according to any one of claims 1 to 6, characterized in that: The groove extends along the axial direction of the material conveying channel.

8. The extrusion device according to any one of claims 1 to 6, characterized in that: The groove is a spiral groove arranged on the wall surface of the feeding channel.

9. The extrusion device according to claim 8, characterized in that: The extrusion piece includes an extrusion shaft and a spiral portion, wherein the spiral portion is arranged around the extrusion shaft, and a rotation direction of the spiral portion is opposite to a rotation direction of the spiral groove.

10. The extrusion device according to claim 8, characterized in that: The lead angle of the spiral groove is C, which satisfies: 60°≤C<90°, preferably, 70°≤C≤80°.

11. The extrusion device according to any one of claims 1 to 6, characterized in that: The depth of the groove is H, and the diameter of the feed channel is D, which satisfies: 0.01≤H / D≤0.1, preferably, 0.03≤H / D≤0.

08.

12. The extrusion device according to any one of claims 1 to 6, characterized in that: Along the axial direction of the feed channel, the extrusion member includes a feed section, a compression section and a metering section, the compression section connects the feed section and the metering section, and the feed section is closer to the inlet than the metering section; Wherein, the groove is arranged at a position of the wall surface corresponding to the feeding section.

13. The extrusion device according to claim 12, characterized in that: The extrusion member includes an extrusion shaft and a spiral portion, and the spiral portion is arranged around the extrusion shaft; The diameter of the portion of the extrusion shaft located in the feeding section is smaller than the diameter of the portion of the extrusion shaft located in the metering section, and the diameter of the portion of the extrusion shaft located in the compression section gradually increases in a direction from the feeding section to the metering section.

14. The extrusion device according to claim 12, characterized in that: The extrusion member includes an extrusion shaft and a spiral portion, and the spiral portion is arranged around the extrusion shaft; The lead of the portion of the spiral part located in the feeding section is greater than the lead of the portion of the spiral part located in the metering section, and the lead of the portion of the spiral part located in the compression section gradually decreases in a direction from the feeding section to the metering section.

15. The extrusion device according to any one of claims 1 to 6, characterized in that: Along the axial direction of the material conveying channel, at least one end of the groove is located between the inlet and the outlet.

16. The extrusion device according to claim 15, characterized in that: The barrel has a first end along the axial direction of the material conveying channel, the inlet is located between the first end and the outlet, one end of the groove is located between the inlet and the outlet, and the other end of the groove extends to the first end.

17. The extrusion device according to any one of claims 1 to 6, characterized in that: The groove extends from one end of the barrel to the other end of the barrel.

18. The extrusion device according to any one of claims 1 to 6, characterized in that: The roughness of the wall surface of the feeding channel is Ra1, which satisfies: 0.8 μm≤Ra1≤3.2 μm, preferably, 1.5 μm≤Ra1≤2.5 μm.

19. The extrusion device according to any one of claims 1 to 6, characterized in that: The extrusion member includes an extrusion shaft and a spiral portion, and the spiral portion is arranged around the extrusion shaft; The roughness of the outer peripheral surface of the extrusion shaft is Ra2, which satisfies: Ra2≤0.4 μm, preferably, Ra2≤0.3 μm; and / or The surface roughness of the spiral portion is Ra3, satisfying: Ra3≤0.4 μm, preferably, Ra3≤0.3 μm.

20. The extrusion device according to any one of claims 1 to 6, characterized in that: Along the axial direction of the feed channel, the extrusion element includes a feed section, a compression section and a metering section, the compression section connects the feed section and the metering section, and the feed section is closer to the inlet than the metering section.

21. The extrusion device according to claim 20, characterized in that: The extrusion member includes an extrusion shaft and a spiral portion, and the spiral portion is arranged around the extrusion shaft; The diameter of the portion of the extrusion shaft located in the feeding section is smaller than the diameter of the portion of the extrusion shaft located in the metering section, and the diameter of the portion of the extrusion shaft located in the compression section gradually increases in a direction from the feeding section to the metering section.

22. The extrusion device according to claim 20, characterized in that: The extrusion member includes an extrusion shaft and a spiral portion, and the spiral portion is arranged around the extrusion shaft; The lead of the portion of the spiral part located in the feeding section is greater than the lead of the portion of the spiral part located in the metering section, and the lead of the portion of the spiral part located in the compression section gradually decreases in a direction from the feeding section to the metering section.

23. The extrusion device according to any one of claims 1 to 6, characterized in that: The barrel includes a first wear-resistant layer, the first wear-resistant layer defines the material delivery channel, and the groove wall surface of the groove is formed on the first wear-resistant layer.

24. The extrusion device according to claim 23, characterized in that: The first wear-resistant layer includes at least one of a tungsten carbide layer and a titanium nitride layer.

25. The extrusion device according to any one of claims 1 to 6, characterized in that: The extrusion member includes an extrusion shaft and a spiral portion, and the spiral portion is arranged around the extrusion shaft; The outer peripheral surface of the extrusion shaft is provided with a second wear-resistant layer; and / or A third wear-resistant layer is provided on the surface of the spiral portion.

26. The extrusion device according to any one of claims 1 to 6, characterized in that: The barrel comprises an inner barrel and an outer barrel, wherein the outer barrel is located outside the inner barrel, the inner barrel and the outer barrel are detachably connected, and the inner barrel defines at least a portion of a material delivery channel.

27. The extrusion device according to claim 26, characterized in that: The inner cylinder includes a first wear-resistant layer, the first wear-resistant layer defines the material conveying channel, and the groove wall surface of the groove is formed on the first wear-resistant layer.

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