Disc type mixing mechanism and mixing system thereof

Abstract

The invention belongs to the technical field of material mixing equipment, and particularly relates to a disc type material mixing mechanism and a material mixing system.The material mixing mechanism comprises a disc base used for material mixing and at least two protrusion sets evenly arranged on the disc base, and the disc base drives the protrusion sets to rotate through rotating motion; and when the flow line of the non-steady flow vortex motion is in contact with the other convex group, the motion direction of the non-steady flow vortex motion is steered, so that the non-steady flow vortex motion can be subjected to a plurality of non-steady flow vortex motions positioned on different horizontal planes and / or vertical planes. The disc type mixing mechanism is suitable for mixing materials with different chemical and physical properties, the mixing uniformity and stability are good, the layering phenomenon is avoided, and under the action of the protrusion sets, the mixing time can be shortened, and the production efficiency can be improved.

Description

Technical Field

[0001] This application relates to the technical field of material mixing equipment, and particularly relates to a disc-type mixing mechanism and its mixing system. Background Art

[0002] Material mixing is a very important link in the production processes of various industries, and it plays a crucial role in improving production efficiency, product quality, and stability. For example, in the pharmaceutical field, various drugs are mixed to prepare ointments or pills; in the chemical industry, various polymer materials are mixed to produce coatings; and in the food industry, flour, syrup, jam, etc. are mixed to prepare desserts. Another example is that with the progress of society, new energy lithium batteries have developed rapidly. To meet the requirements of high-performance lithium batteries, it is necessary to mix high-activity and low-activity anode materials to obtain anode materials with moderate surface activity.

[0003] However, after the existing mixing equipment completes the material mixing of high-activity anode materials and low-activity anode materials, the mixing material indexes are often poor, the mixing effect is uneven, and the mixing efficiency is low; moreover, by observing the mixed materials through a scanning electron microscope, it is found that the edges of the rhomboid shapes on the surface of the anode materials after mixing are still obvious, and such anode materials after mixing cannot effectively improve the comprehensive performance of lithium batteries.

[0004] Currently, in response to the problem of uneven mixing effect of the above-mentioned mixed materials, technicians in various industries have continuously developed various types of mixing equipment. For example, the patent with the publication number CN205993607U discloses a pig feed mixing device with adjustable mixing range. A disc is provided on both the upper and lower parts of the rotating shaft, and a number of mixing protrusions are evenly arranged on the upper and lower surfaces of the disc. The mixing protrusions are in the shape of a triangular pyramid. This device uses the mixing protrusions arranged on the disc to stir and mix the materials, but its improvement of mixing uniformity relies on the spiral blades at the bottom of the rotating shaft.

[0005] Another example is that the patent application document with the publication number CN107971110A discloses a method for grinding hydrogenated SEBS. The materials are sent to a ribbon mixer and evenly distributed in a rotating conveyor. They are pushed by a screw into a powder chamber composed of 6 stationary grinding discs and moving grinding discs. Due to the high-speed rotation of the moving grinding disc and the gravitational force of the blower, the materials are continuously sheared, impacted, and ground, and the particles become smaller and smaller. They move outward under the pulling force and finally are collected by an aggregate system through a discharge pipe; the structure of the grinding machine equipment consists of a machine body, a frame, a crushing device, a discharge pipe, a transmission device, and a motor, and is equipped with a complete set of thermoplastic plastic micro-crushing and grinding units such as a main machine, a blower, an aggregator, a rotary air lock valve, a dust collector, and an electric control cabinet. This method mixes SEBS particles and antioxidants in a ribbon mixer, which can only ensure the uniform distribution of the mixed materials in the rotating conveyor, but cannot ensure the uniform mixing of SEBS particles and antioxidants.

[0006] For another example, the patent with the publication number CN213699648U discloses a mixer that can move in multiple directions. While the stirring motor drives the spiral stirring blades to mix and stir inside the mixing tank, it can drive the mixing tank to move reciprocally left and right, thereby driving the materials inside the mixing tank to move in multiple directions, which can greatly improve the efficiency of mixing and stirring. Among them, the disc and the cylindrical protrusions on the disc surface drive the mixing tank to move reciprocally left and right.

[0007] It can be seen from this that the main mixing mechanism of the existing mixing equipment is still the spiral stirring blade, but this mechanism is not suitable for easily broken materials, and when dealing with materials of different densities or viscosities, stratification may occur, thus affecting the uniformity of mixing. Summary of the Invention

[0008] In view of the above-mentioned disadvantages of the prior art, the present invention provides a disc-type mixing mechanism and its mixing system, which is suitable for mixing materials with different chemical and physical properties and has good mixing uniformity.

[0009] To achieve the above object and related objects, the present invention adopts the following technical solutions:

[0010] In the first aspect of the present invention, a disc-type mixing mechanism is provided, including a disc base for mixing materials and at least two protrusion groups evenly arranged on the disc base. The disc base drives the protrusion groups to rotate through rotational motion, so that the materials perform a variety of unsteady flow vortex motions located in different horizontal planes and / or vertical planes, and when the streamline of the unsteady flow vortex motion contacts another protrusion group, the motion direction of the unsteady flow vortex motion turns.

[0011] According to the above technical means, the disc-type mixing mechanism of the present application is suitable for mixing materials with different chemical and physical properties, such as mixing two materials with different particle sizes and densities; through the rotational motion of the disc base of the present application, under the blocking and rebounding effects of the protrusion groups, different materials perform multiple unidirectional unsteady flow vortex motions in the disc base, thereby changing the horizontal motion direction and motion speed of the materials in the disc base, as well as changing the throwing amplitude of the materials in the vertical direction, and further enabling the materials to perform multi-dimensional motion changes to uniformly mix different materials.

[0012] The unsteady flow vortex motion of the present application refers to the change of the materials over time, and the motion state such as the motion direction and motion speed also changes.

[0013] Further, when the disc base continuously rotates, the materials form multiple eddies in the disc base through its multiple unsteady flow vortex motions, and / or, the paths of at least two unsteady flow vortex motions coincide.

[0014] According to the above technical means, as time goes by, the disc base continuously rotates. When the material passes through the raised group, multiple unsteady flow vortex motions can respectively form local eddies to mix the material within the range affected by the eddies. The existence of these eddies can make the distribution of the material on the disc base more dispersed, avoiding local aggregation of the material, which is conducive to improving the mixing uniformity.

[0015] In addition, under the influence of the raised group and the mixing degree of the material, as time goes by, when the material is mixed to near-uniform state, the unsteady flow vortex motion of the material gradually tends to be stable. The paths of the unsteady flow vortex motions of the materials with similar mixing degrees gradually coincide under the action of the raised parts, thereby reducing the possibility of over-mixing of the material and ensuring the stability of the mixing uniformity.

[0016] Furthermore, the raised group includes multiple convex teeth with different heights arranged at intervals.

[0017] According to the above technical means, the convex teeth with different heights on the disc base will cause the material to collide with the convex teeth during the rotation of the disc base. The convex teeth with different heights can produce blocking and rebounding effects on the material on different horizontal planes, causing the unsteady flow vortex motion of the material to turn, increasing the chance of mutual collision and mixing of the material.

[0018] In addition, for materials with large density differences, the convex teeth with different heights can prevent the material from stratifying due to different densities.

[0019] Furthermore, there is an inclined angle between the convex tooth and the axis of the disc base where it is located.

[0020] According to the above technical means, the convex teeth of the present application are provided with an inclined angle, which can affect the motion path of the unsteady flow vortex motion of the material, thereby affecting the mixing uniformity of the material; and the convex teeth with different inclined angles may cause changes in the collision and friction frequencies between the materials, further affecting the dispersion and mixing effects of the material particles.

[0021] Furthermore, the height range of the convex teeth is 35 mm to 45 mm.

[0022] Furthermore, the range of the inclined angle of the convex teeth is 20° to 40°.

[0023] Furthermore, it further includes a main motor for driving the disc base to perform a rotational motion.

[0024] The second aspect of the present invention provides a mixing system, which includes a feeding unit, a mixing unit, a filtering unit, and a discharging unit that are sequentially connected by pipelines along the material conveying direction. The mixing unit includes the above-mentioned disc-type mixing mechanism.

[0025] Furthermore, the mixing unit further includes a negative-pressure mixing bin and a separator for restricting the position of the material in the negative-pressure mixing bin. The disk-type mixing mechanism is installed at the bottom of the negative-pressure mixing bin, and the separator is installed at the top of the negative-pressure mixing bin.

[0026] Furthermore, the feeding unit includes a hopper and a feeding mechanism. The discharge port of the hopper is located at the bottom of the hopper, and the feeding port of the feeding mechanism is connected to the discharge port of the hopper through a pipeline.

[0027] The beneficial technical effects of the present invention are as follows:

[0028] The disk-type mixing mechanism of the present invention is applicable to the mixing of materials with different chemical and physical properties, and has good mixing uniformity and stability, without layering phenomenon. Under the action of the convex group, the mixing mechanism can shorten the mixing time and improve the production efficiency.

[0029] The mixing system of the present invention utilizes the above-mentioned disk-type mixing mechanism, filtering unit and other devices, which can effectively achieve the uniform dispersion and efficient mixing of materials, and also has a modifying effect on the microscopic morphology of the surface of material particles. In addition, the mixing system of the present invention can effectively reduce dust pollution, providing guarantee for the safety and environmental protection of the production environment. Description of the Drawings

[0030] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with the present application, and are used together with the specification to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0031] Figure 1 It is a top view of the disk-type mixing mechanism shown in an embodiment of the present application;

[0032] Figure 2 It is a schematic structural diagram of the separator shown in an embodiment of the present application;

[0033] Figure 3 It is a schematic structural diagram of the mixing system shown in an embodiment of the present application;

[0034] Figure 4 It is a SEM image of the morphology of various raw materials in the natural mixing state of the present application;

[0035] Figure 5 For Figure 4 It is a SEM image of the morphology of various raw materials after being mixed by the mixing system of the present application.

[0036] Reference Signs

[0037] 1: Hopper; 2: Feeding mechanism; 3: Negative pressure mixing bin; 4: Separator; 5: Sub-motor; 6: Disc base; 61: Convex teeth; 7: Main motor; 8: Dust removal filter tank; 9: Collection bucket; 10: Fan. Detailed implementation mode

[0038] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should be understood that certain features of the present invention (described in the context of separate embodiments for clarity) can also be provided in combination in a single embodiment. Conversely, multiple features of the present invention (described in the context of a single embodiment for brevity) can also be provided separately or in any suitable combination or, when appropriate, in any other described embodiment of the present invention. Certain features described in the context of various embodiments will not be considered essential features of those embodiments unless the embodiment is inoperable without those elements. The following further illustrates the present invention through specific examples, but it should be noted that the specific process conditions and results described in the embodiments of the present invention are only used to illustrate the present invention and cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

[0039] As Figure 1 and Figure 3 shown, the present invention provides a disc-type mixing mechanism, including a disc base 6 for mixing materials and at least two convex groups uniformly arranged on the disc base 6. The disc base 6 drives the convex groups to rotate through a rotational motion, so that the materials perform a variety of unsteady flow vortex motions located on different horizontal planes and / or vertical planes, and when the streamline of the unsteady flow vortex motion contacts another convex group, the motion direction of the unsteady flow vortex motion turns.

[0040] Furthermore, the disc-type mixing mechanism further includes a main motor 7 for driving the disc base 6 to perform a rotational motion. The main motor 7 can be installed together with the disc base 6 through a mounting shaft to drive the disc base 6 to rotate during its operation, thereby disturbing the materials. The types of the main motor 7 in this application include but are not limited to DC motors, asynchronous motors, and synchronous motors. The frequency of the main motor 7 is 80 Hz to 120 Hz, such as 80 Hz, 90 Hz, 100 Hz, 110 Hz, and 120 Hz, but not limited to the listed values. Other unlisted values within the above numerical range are equally applicable.

[0041] Furthermore, the unsteady flow vortex motion in this application refers to the change of materials over time, and the motion states such as the motion direction and motion speed also change. Further still, when the main motor 7 operates, the disk base 6 and its convex group rotate at high speed, and the materials are disturbed into a fluid state. As the rotation time increases, under the blocking and rebounding effects of the convex group, different materials perform multiple unsteady flow vortex motions in different directions in the disk base 6, thereby changing the horizontal motion direction and motion speed of the materials in the disk base 6, as well as changing the throwing amplitude of the materials in the vertical direction, and further enabling the materials to perform multi-dimensional motion changes to uniformly mix different materials.

[0042] Furthermore, when the disk base 6 continues to rotate, the materials form multiple eddies in the disk base 6 through its multiple unsteady flow vortex motions, and / or the paths of at least two unsteady flow vortex motions coincide. As time goes by, with the continuous rotation of the disk base 6, when the materials pass through the convex group, multiple unsteady flow vortex motions can respectively form local eddies to mix the materials within the influence range of the eddies. The existence of these eddies can make the distribution of the materials on the disk base 6 more dispersed, avoid local aggregation of the materials, and facilitate improving the mixing uniformity. In addition, under the influence of the convex group and the mixing degree of the materials, as time goes by, when the materials are mixed to near-uniform state, the unsteady flow vortex motion of the materials gradually tends to be stable, and the paths of the unsteady flow vortex motions of the materials with similar mixing degrees gradually coincide under the action of the convexities, thereby reducing the possibility of over-mixing of the materials and ensuring the stability of the mixing uniformity.

[0043] Furthermore, the convex group includes multiple convex teeth 61 with different heights and arranged at intervals. The number of convex groups in this application can be 2 groups, 4 groups or 6 groups, preferably arranged at intervals on the disk base 6, and more preferably arranged at intervals on the disk base 6 in an axisymmetric manner. Further still, the convex teeth 61 in this application can be in the form of rectangular plates, etc., and its thickness is set according to actual needs. And to ensure the service life of the material mixing mechanism, the convex teeth 61 in this application are made of materials with greater rigidity and wear resistance, such as stainless steel and other materials. The number of convex teeth 61 in each group of convex groups in this application is set according to actual needs, and can be 3, 4 or 5. The height of the convex teeth 61 is 35 mm to 45 mm, such as 35 mm, 37 mm, 40 mm, 41 mm, 43 mm and 45 mm, but not limited to the listed values, and other unlisted values within the above numerical range are equally applicable. Specifically, the heights of the multiple convex teeth 61 of the convex group in this application can be arranged in ascending order, the same or in disorder along the clockwise direction of the disk base 6, and preferably arranged in ascending order. The height arrangement modes of the convex teeth 61 of multiple groups of convex groups in this application can be kept consistent, or adjusted according to actual needs, and preferably the two axisymmetric groups of convex groups are adjusted synchronously.

[0044] Furthermore, the convex teeth 61 with different heights on the disc base 6 of the present application will cause various materials to collide with these convex teeth 61 during the rotation of the disc base 6. The convex teeth 61 with different heights can produce blocking and rebounding effects on the materials at different horizontal planes, making the movement trajectories of the materials more complex and changeable. The materials that originally move in a regular circular motion on the disc base 6 will continuously change their movement directions due to the existence of the convex teeth 61, thus causing the non-steady flow vortex motion of the materials to turn, and increasing the opportunities for mutual collision and mixing of various materials. For example, when the materials pass through the convex teeth 61 with a lower height, they may be slightly bounced up and change the movement speed in the horizontal direction, resulting in a small-degree turn; while when encountering the convex teeth 61 with a higher height, the materials may be thrown up greatly, not only changing the movement speed in the horizontal direction, but also generating more violent movement in the vertical direction. This multi-dimensional movement change helps to improve the mixing uniformity of various materials.

[0045] Furthermore, when the disc base 6 rotates with the convex teeth 61 of different heights in the present application, local eddies will be formed around the convex teeth 61 by the materials, promoting more sufficient stirring and mixing of the materials. For example, small local eddies are formed around the convex teeth 61 with a lower height by the non-steady flow vortex motion of the materials to mix the materials in a small surrounding area; while larger-scale eddies are formed around the convex teeth 61 with a higher height, affecting the materials in a wider area. The existence of these eddies makes the distribution of various materials on the disc base 6 more dispersed, avoiding local aggregation of the materials, and thus effectively improving the mixing uniformity of the materials.

[0046] Furthermore, the present application uses the convex group to increase the opportunities for collision and position exchange between various materials, making the mixing process of the materials more efficient and able to reach a uniformly mixed state faster. For materials with a large difference in particle size, the convex teeth 61 with different heights can better adapt to their mixing requirements. When the larger-particle-size materials encounter the convex teeth 61, they may be thrown up or bounced off, thus having more contact opportunities with the smaller-particle-size materials; while the smaller-particle-size materials may be fully mixed with the larger-particle-size materials in the eddies around the convex teeth 61. For materials with a large difference in density, the convex group can prevent the occurrence of layering phenomena of various materials due to different densities. When the materials with a larger density move in a non-steady flow vortex motion in the disc base 6, they may have a tendency to sink, but the convex teeth 61 with different heights will hinder their movement and prevent them from sinking quickly; while the materials with a smaller density will also be fully mixed with the materials with a larger density under the action of the convex teeth 61, avoiding the situation where the materials with a smaller density float on the upper layer and the materials with a larger density deposit at the bottom, and thus improving the mixing uniformity.

[0047] Further, there is an inclined angle between the convex tooth 61 and the axis of the disk base 6 where it is located. The range of the inclined angle of the convex tooth 61 is 20° to 40°, such as 20°, 22°, 24°, 26°, 28°, 30°, 32°, 34°, 36°, 38°, and 40°, but not limited to the listed values. Other unlisted values within the above numerical range are equally applicable. Specifically, the inclined directions of multiple convex teeth 61 in this application can be the same or different, and the magnitudes of the inclined angles of multiple convex teeth 61 can be arranged in ascending order, descending order, randomly, or be the same along the clockwise direction of the disk base 6. The magnitude of the inclined angle of each convex group is set according to actual mixing requirements and can be the same or different.

[0048] Furthermore, in this application, by setting the convex tooth 61 with an inclined angle, the movement path of the unsteady flow vortex motion of the material is affected, thereby affecting the mixing uniformity of the material; and the convex teeth 61 with different inclined angles may cause changes in the collision and friction frequencies between the materials, thereby affecting the dispersion and mixing effects of the material particles. For example, the convex tooth 61 with a large inclined angle may cause stronger inter-particle collisions and may also cause the material to flow along a specific path, thereby improving the mixing efficiency.

[0049] As Figure 2 and Figure 3 shown, the present invention also provides a mixing system, which includes a feeding unit, a mixing unit, a filtering unit, and a discharging unit that are sequentially connected by pipelines along the material conveying direction. The mixing unit includes the above-mentioned disk-type mixing mechanism.

[0050] Further, the feeding unit includes a hopper 1 and a feeding mechanism 2. The discharging port of the hopper 1 is located at the bottom of the hopper 1, and the feeding port of the feeding mechanism 2 is connected to the discharging port of the hopper 1 by a pipeline. The volume and shape of the hopper 1 in this application are not limited and are selected according to the amount of the premixed material. For example, the hopper 1 can be a conical hopper, etc. Furthermore, in order to achieve the efficient conveying of the premixed material, the feeding port of the material port in this application is connected by a cross-shaped pipe. The cross-shaped pipe has multiple ports, one of which is connected to a suction pipe. One end of the suction pipe is connected to the feeding port through the cross-shaped pipe, and the other end is connected to the premixed material storage area; the remaining ports of the cross-shaped pipe can also be connected to the premixed area of the system, etc. In this way, the smooth conveying of the premixed material is ensured, and the flexibility and operation convenience of the system are improved. The feeding mechanism 2 in this application can be a screw feeding mechanism, which is used to controllably convey the premixed material in the hopper 1 to the mixing unit. By controlling the screw feeding mechanism, the amount and feeding speed of the premixed material entering the mixing unit are controlled.

[0051] Further, the mixing unit further includes a negative-pressure mixing bin 3 and a separator 4 for restricting the position of the material in the negative-pressure mixing bin 3. The disk-type mixing mechanism is installed at the bottom of the negative-pressure mixing bin 3, and the separator 4 is installed at the top of the negative-pressure mixing bin 3. In this application, the separator 4 is preferably a cage-shaped separator as shown in Figure 2 . A secondary motor 5 is connected to the top of the separator 4. The types of the secondary motor 5 include but are not limited to DC motors, asynchronous motors, and synchronous motors. The frequency of the secondary motor 5 is 60 Hz to 100 Hz, such as 60 Hz, 70 Hz, 80 Hz, 90 Hz, and 100 Hz, but not limited to the listed values. Other unlisted values within the above value range are equally applicable. In this application, the secondary motor 5 is used to drive the separator 4 to rotate rapidly, generate centrifugal force, and confine the material in the negative-pressure mixing bin 3.

[0052] Furthermore, the mixing system of this application further includes a blower 10. The blower 10 is externally connected to the mixing bin. When the blower 10 is started, it provides negative pressure to the mixing bin, thereby forming a negative-pressure mixing bin 3. The function of the blower 10 in this application is to generate negative pressure, so that the material in the negative-pressure mixing bin 3 is attracted by the negative pressure, and thus rotates and flies up in the negative-pressure mixing bin 3, so that the material is fully mixed in the negative-pressure mixing bin 3, and during the mixing process, the material rubs against the inner wall of the negative-pressure mixing bin 3 to optimize the morphology of the material. The blower 10 in this application is preferably a Roots blower, and its frequency is 60 Hz to 120 Hz, such as 60 Hz, 75 Hz, 85 Hz, 95 Hz, 105 Hz, and 120 Hz, but not limited to the listed values. Other unlisted values within the above value range are equally applicable.

[0053] Furthermore, the air volume of the blower 10 in this application remains stable to reduce the sudden change of pressure in the negative-pressure mixing bin 3 and reduce the possibility of generating turbulence. The cage-shaped separator 4 generates centrifugal force through high-speed rotation, and its internal flow field can further suppress turbulence after optimized design. Specifically, the negative pressure generated by the blower 10 in this application guides the airflow in the negative-pressure mixing bin 3 to the separator 4, and the airflow direction and the centrifugal force direction (radial direction) of the separator 4 can form a coherent flow path. The centrifugal force action area of the separator 4 is concentrated near the inner wall of the negative-pressure mixing bin 3, and the airflow driven by the blower 10 is mainly axial, and the two directions are complementary. Therefore, no turbulence phenomenon will occur in the negative-pressure mixing bin 3 of this application.

[0054] Furthermore, the mixing time of the material in the negative-pressure mixing bin 3 in this application is 60 s to 120 s to ensure the mixing uniformity of the material. This application controls the mixing time of the material to avoid excessive energy consumption of the equipment due to too long time. And when the material is a sensitive substance, if the mixing time is too long, the material may have negative situations such as deterioration and decomposition; if the mixing time is too short, the number of collisions and position exchanges between multiple materials is not enough, and the mixing uniformity is low.

[0055] Further, the filtering unit of the present application includes a dust removal and filtration tank 8 for exhausting the separated gas. Specifically, a plurality of longitudinally spaced long strip-shaped cloth bags are fixedly connected inside the dust removal and filtration tank 8 of the present application, and a keel for support is provided inside the cloth bags to ensure that the cloth bags will not deform when the fan 10 extracts negative pressure from the negative pressure mixing chamber 3. The upper part of the dust removal and filtration tank 8 of the present application is a closed space, and the pipeline of the fan 10 passes through the closed space to extract negative pressure from the negative pressure mixing chamber 3, and the internal accommodation space of the dust removal and filtration tank 8 is communicated with the cloth bags to allow the materials entering the cloth bags to fall into the accommodation space. When the material mixing is completed, the frequency of the auxiliary motor 5 is adjusted to reduce the rotation speed of the separator 4. When the centrifugal force of the separator 4 is less than the negative pressure, the mixed material is transported to the dust removal and filtration tank 8 by the negative pressure upward air flow. The separated gas is exhausted through the dust removal and filtration tank 8, and the material powder in the dust removal and filtration tank 8 is shaken off into the collection bucket 9 below the dust removal and filtration tank 8 under the action of the pulse device. The volume and shape of the collection bucket 9 of the present application are set according to actual needs, for example, it can be a conical or elliptical collection bucket, etc.

[0056] Further, during the material mixing process of the present application, clean air is exhausted from the mixing system, which can ensure the environmental protection and safety of the entire mixing process, and can reduce dust pollution on the basis of improving the material mixing efficiency.

[0057] Further, the present application provides the following several specific embodiments to further elaborate on the technical solution of the present application.

[0058] Embodiment 1

[0059] In this embodiment, three materials in Table 1 are selected as the mixing raw materials, and the above mixing system is used for mixing.

[0060] Table 1 Performance Table of Mixing Raw Materials

[0061] Object Particle size D50 / μm <![CDATA[Specific surface area / (m 2 / g)]]> Graphitization degree / % Anode material A 9 2.4 92.5 Anode material B 15 1.8 93.4 Anode material C 17 1.7 93.1

[0062] In this embodiment, the graphitized anode materials A, B, and C are sieved through a 200-mesh sieve to obtain pre-mixed anode materials A, B, and C with a particle size less than 200 mesh.

[0063] The pre-mixed anode materials A, B, and C enter the disk-type mixing mechanism of the negative pressure mixing chamber 3 through the screw feeding mechanism connected to the hopper 1, and the feeding time is 30 seconds; the main motor 7 is turned on and its frequency is 95 Hz, the auxiliary motor 5 is turned on and its frequency is 75 Hz, and the fan 10 is turned on and its frequency is 80 Hz.

[0064] Further, this embodiment has four groups of convex groups, each group of convex groups has three spaced-apart convex teeth 61, and the arrangement of the convex teeth 61 of the two axially symmetric groups of convex groups is the same. The parameters of the convex teeth 61 of the two groups of convex groups are shown in Table 2.

[0065] Table 2 Convex Tooth Parameter Table

[0066] Raised group 1 Height / mm Tilt angle / ° Raised group 2 Height / mm Tilt angle / ° Convex tooth 61-1 35 20 Convex tooth 61-4 40 20 Convex tooth 61-2 40 30 Convex tooth 61-5 40 30 Convex tooth 61-3 45 40 Convex tooth 61-6 40 40

[0067] In this embodiment, the convex teeth 61 of the convex group 1 are arranged in ascending order in the clockwise direction along the disc base 6.

[0068] In this embodiment, the negative electrode materials A, B, and C are mixed in the negative pressure mixing chamber 3 for 60 seconds, and then the rotation speed of the separator 4 is controlled to decrease so that the centrifugal force is less than the negative pressure. The mixed material after mixing is transported to the dust removal and filtration tank 8, and the separated gas is discharged through the dust removal and filtration tank 8. The mixed material powder in the dust removal and filtration tank 8 is shaken off into the collection bucket 9 under the action of the pulse device.

[0069] In this embodiment, the discharging time of the mixed material is 20 seconds, and according to the above mixing process, the daily output of the mixed material can reach 60.1 tons.

[0070] Example 2

[0071] The difference between this embodiment and Example 1 is that: the main motor 7 is turned on and its frequency is 80 Hz, the auxiliary motor 5 is turned on and its frequency is 60 Hz, and the blower 10 is turned on and its frequency is 60 Hz; the negative electrode materials A, B, and C are mixed in the negative pressure mixing chamber 3 for 80 seconds;

[0072] According to the above mixing process, the daily output of the mixed material can reach 52.7 tons.

[0073] Example 3

[0074] The difference between this embodiment and Example 1 is that: the main motor 7 is turned on and its frequency is 105 Hz, the auxiliary motor 5 is turned on and its frequency is 95 Hz, and the blower 10 is turned on and its frequency is 120 Hz; the negative electrode materials A, B, and C are mixed in the negative pressure mixing chamber 3 for 100 seconds;

[0075] According to the above mixing process, the daily output of the mixed material can reach 46.8 tons.

[0076] Example 4

[0077] The difference between this embodiment and Example 1 is that: the main motor 7 is turned on and its frequency is 120 Hz, the auxiliary motor 5 is turned on and its frequency is 100 Hz, and the blower 10 is turned on and its frequency is 100 Hz; the negative electrode materials A, B, and C are mixed in the negative pressure mixing chamber 3 for 120 seconds;

[0078] According to the above mixing process, the daily output of the mixed material can reach 42.1 tons.

[0079] Comparative Example 1

[0080] The difference between this comparative example and Example 1 lies in the convex tooth parameters of the convex group. The convex tooth parameters of this comparative example are shown in Table 3.

[0081] Table 3 Convex Tooth Parameters Table of Comparative Example 1

[0082] Raised group 1 Height / mm Tilt angle / ° Raised group 2 Height / mm Tilt angle / ° Convex tooth 61-1 45 20 Convex tooth 61-4 50 20 Convex tooth 61-2 50 30 Convex tooth 61-5 50 30 Convex tooth 61-3 55 40 Convex tooth 61-6 50 40

[0083] Comparative Example 2

[0084] The difference between this comparative example and Example 1 lies in the convex tooth parameters of the convex group. The convex tooth parameters of this comparative example are shown in Table 4.

[0085] Table 4 Convex Tooth Parameters Table of Comparative Example 2

[0086] Raised group 1 Height / mm Tilt angle / ° Raised group 2 Height / mm Tilt angle / ° Convex tooth 61-1 25 20 Convex tooth 61-4 30 20 Convex tooth 61-2 30 30 Convex tooth 61-5 30 30 Convex tooth 61-3 35 40 Convex tooth 61-6 30 40

[0087] Comparative Example 3

[0088] The difference between this comparative example and Example 1 lies in the convex tooth parameters of the convex group. The convex tooth parameters of this comparative example are shown in Table 5.

[0089] Table 5 Convex Tooth Parameters Table of Comparative Example 3

[0090] Raised group 1 Height / mm Tilt angle / ° Raised group 2 Height / mm Tilt angle / ° Convex tooth 61-1 35 15 Convex tooth 61-4 40 15 Convex tooth 61-2 40 18 Convex tooth 61-5 40 18 Convex tooth 61-3 45 20 Convex tooth 61-6 40 20

[0091] Comparative Example 4

[0092] The difference between this comparative example and Example 1 lies in the convex tooth parameters of the convex group. The convex tooth parameters of this comparative example are shown in Table 6.

[0093] Table 6 Convex Tooth Parameters Table of Comparative Example 4

[0094] Raised group 1 Height / mm Tilt angle / ° Raised group 2 Height / mm Tilt angle / ° Convex tooth 61-1 35 40 Convex tooth 61-4 40 40 Convex tooth 61-2 40 50 Convex tooth 61-5 40 50 Convex tooth 61-3 45 60 Convex tooth 61-6 40 60

[0095] Performance Test

[0096] Mixing Performance: For Examples 1 to 4 and Comparative Examples 1 to 4, the particle size, specific surface area, and graphitization degree of the final mixed materials were detected. The detection results are shown in Table 7. (It should be noted here that the graphitization degree detected in this application is based on the comparison consideration with the actual mixture using the weighted average algorithm. The higher the degree of coincidence, the better the mixing effect)

[0097] Morphology Appearance: The morphology of the pre-mixed anode materials A, B, and C in the natural mixing state was observed using a scanning electron microscope, and the results are as Figure 4 shown; the morphology of the mixed materials of the anode materials A, B, and C after being mixed by the mixing system of this application was observed using a scanning electron microscope, as Figure 5 shown.

[0098] Experimental Data and Analysis

[0099] Table 7 Mixing Performance of Examples and Comparative Examples

[0100] Group Particle size D50 / μm <![CDATA[Specific surface area / (m 2 / g)]]> Graphitization degree / % Example 1 14.09 2.16 90.21 Example 2 13.94 2.10 91.14 Example 3 13.26 1.99 91.61 Example 4 13.39 2.01 92.07 Comparative example 1 15.32 2.21 92.45 Comparative example 2 15.57 2.26 92.71 Comparative example 3 14.95 2.30 92.68 Comparative example 4 15.03 2.27 92.39

[0101] From the mixing performance data of Comparative Example 1 and Examples 1 to 4, it can be seen that the mixing performance of the examples of the present application is superior to that of Comparative Example 1. This is because the convex tooth height of Comparative Example 1 exceeds the defined range of the present application, and its convex teeth are too high. When the negative electrode materials A, B, and C perform unsteady flow vortex motion on the disc base, the too-high convex teeth hinder the smooth flow of the negative electrode materials, and the resistance increases during the mixing process, resulting in a low mixing uniformity of the negative electrode materials A, B, and C, and thus poor mixing performance.

[0102] From the mixing performance data of Comparative Example 2 and Examples 1 to 4, it can be seen that the mixing performance of the examples of the present application is superior to that of Comparative Example 2. This is because the convex tooth height of Comparative Example 2 is lower than the defined range of the present application, and its convex teeth are too low, which shortens the residence time of the negative electrode materials A, B, and C in the mixing area. The negative electrode materials A, B, and C quickly pass through the mixing area, and the interaction between the negative electrode materials A, B, and C weakens, resulting in insufficient mixing, and thus poor mixing performance.

[0103] From the mixing performance data of Comparative Example 3 and Examples 1 to 4, it can be seen that the mixing performance of the examples of the present application is superior to that of Comparative Example 3. This is because the inclination angle of the convex teeth of Comparative Example 3 is smaller than the defined range of the present application. The too-small inclination angle of its convex teeth will cause the flow velocity of the negative electrode materials A, B, and C on the disc base to slow down, and may stagnate in a certain area of the disc base to form a mixing dead angle. And the smaller inclination angle will result in a single flow pattern of the unsteady flow vortex motion of the negative electrode materials A, B, and C, and a complex flow path cannot be formed. Furthermore, the mixing uniformity of the negative electrode materials A, B, and C is low, and the mixing performance is poor.

[0104] From the mixing performance data of Comparative Example 4 and Examples 1 to 4, it can be seen that the mixing performance of the examples of the present application is superior to that of Comparative Example 4. This is because the inclination angle of the convex teeth of Comparative Example 4 is larger than the defined range of the present application. The too-large inclination angle of its convex teeth will cause uneven distribution of the negative electrode materials A, B, and C during the mixing process, resulting in the concentration of the negative electrode materials in some areas and insufficient mixing. And the convex teeth with too-large inclination angles will increase the sliding resistance of the negative electrode materials A, B, and C on the disc base, resulting in poor flow of the negative electrode materials A, B, and C. Therefore, the mixing uniformity of Comparative Example 4 is low and the performance is poor.

[0105] As Figure 4 shown, in the natural mixing state of the pre-mixed negative electrode materials A, B, and C, the edges of the negative electrode materials have obvious surface rhombus-like structures. However, when the negative electrode materials are used in lithium batteries, this rhombus-like surface characteristic may become the starting point of lithium dendrites, increase its contact area with the electrolyte, exacerbate the occurrence of side reactions, and affect the safety of lithium batteries.

[0106] As Figure 5 shown, after the negative electrode materials A, B, and C are mixed by the mixing system of the present application, the surface of the material is more round, which indicates that the mixing system of the present application not only has a good mixing effect, but also has a modifying effect on the microscopic morphology of the particle surface. When the mixed material is used as the negative electrode material in a lithium battery, the risk of internal short circuit is lower and it is more secure.

[0107] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A disc type mixing mechanism, comprising a disc base (6) for mixing materials, characterized in that: The invention also comprises at least two protrusion groups evenly arranged on the disc base (6), wherein the disc base (6) drives the protrusion groups to rotate through rotational motion, so that the material performs a plurality of unsteady flow vortex motions located on different horizontal planes and / or vertical planes, and when the streamline of the unsteady flow vortex motion contacts another protrusion group, the motion direction of the unsteady flow vortex motion is turned.

2. The disc type mixing mechanism according to claim 1, characterized in that: When the disc base (6) continues to rotate, the material forms a plurality of vortices in the disc base (6) through its multiple unsteady flow vortex motions, and / or the paths of at least two unsteady flow vortex motions overlap.

3. The disc type mixing mechanism according to claim 1 or 2, characterized in that: The protrusion group includes a plurality of protruding teeth (61) with different heights and arranged at intervals.

4. The disc type mixing mechanism according to claim 3, characterized in that: There is an inclined angle between the protruding tooth (61) and the axis of the disc base (6) on which it is located.

5. The disc type mixing mechanism according to claim 3, characterized in that: The height of the protruding teeth (61) ranges from 35 mm to 45 mm.

6. The disc type mixing mechanism according to claim 4, characterized in that: The inclined angle of the convex teeth (61) ranges from 20° to 40°.

7. The disc type mixing mechanism according to claim 1, 2, 4, 5 or 6, characterized in that: It also includes a main motor (7) for driving the disc base (6) to perform rotational motion.

8. A mixing system, characterized in that: It comprises a feeding unit, a mixing unit, a filtering unit and a discharging unit which are sequentially connected by pipelines along a material conveying direction, and the mixing unit comprises the disc-type mixing mechanism according to any one of claims 1 to 7.

9. The mixing system according to claim 8, characterized in that: The mixing unit further comprises a negative pressure mixing bin (3) and a separator (4) for limiting the position of materials in the negative pressure mixing bin (3); the disc-type mixing mechanism is installed at the bottom of the negative pressure mixing bin (3), and the separator (4) is installed at the top of the negative pressure mixing bin (3).

10. The mixing system according to claim 8 or 9, characterized in that: The feeding unit comprises a hopper (1) and a feeding mechanism (2), wherein the feeding port of the feeding mechanism (2) is connected to the discharge port pipeline of the hopper (1).

Images