Mixing device

Abstract

The utility model discloses a material mixing device. The material mixing device comprises a shell, a cooling airflow power assembly and a vacuum assembly. A material mixing cavity is formed in the shell, the cooling airflow power assembly communicates with the material mixing cavity and is used for providing cooling airflow for the material mixing cavity, and the vacuum assembly communicates with the material mixing cavity and is used for vacuumizing the material mixing cavity. The cooling airflow power assembly can provide airflow power for fluidization and mixing of the material powder, so that the material powder can rapidly flow in an airflow mode, and the effect of mixing different material powder particles is achieved. Meanwhile, the airflow power can play a role in cooling the material powder, so that the solid binder is prevented from generating viscosity under the action of high temperature, and the problem of fibration in the mixing process is solved. Under the vacuum condition, material powder particles with different particle sizes can fall and be mixed in the material mixing device at the same speed, the problem of particle segregation existing in the falling and mixing process due to the difference of the particle sizes and the weights of the material powder is solved, and the stability and the uniformity of material mixing are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, in particular to a mixing device. BACKGROUND

[0002] The dry electrode technology is to spray or hot-press the mixed electrode material powder on the electrode sheet to achieve the effect of combination of the electrode material powder and the electrode sheet. The electrode material powder includes active material, conductive agent, solid binder and other materials. Since the dry electrode technology does not need to use binder solvent, and does not need to recover and bake the binder solvent, compared with the wet electrode technology, the dry electrode technology has a simple process flow, smaller equipment footprint, and is more suitable for large-scale production of electrode sheets, and has obvious advantages.

[0003] In the related art, due to the large particle size difference of different raw material particles in the powder, and the adhesion of the solid binder in the mixing process, there is a fiberization phenomenon in the mixing process, which leads to poor uniformity of the mixed powder, long mixing cycle, low stability of the powder and other problems. CONTENT OF THE INVENTION

[0004] To solve at least one of the above technical problems, the present application provides a mixing device which can mix in a vacuum and low temperature environment, improve the uniformity and stability of the mixing, and the technical scheme adopted is as follows.

[0005] The mixing device provided by the present application comprises a shell, a cooling air flow power assembly and a vacuum assembly, a mixing cavity is formed in the shell; the cooling air flow power assembly is communicated to the mixing cavity for providing cooling air flow to the mixing cavity; the vacuum assembly is communicated to the mixing cavity for vacuumizing the mixing cavity.

[0006] In some embodiments of the present application, the mixing device further comprises a lifting assembly, the lifting assembly comprises a lifting screw, the lifting screw is rotationally arranged in the mixing cavity for lifting the powder upwards and then falling, the cooling air flow power assembly comprises an air outlet, the air outlet is arranged corresponding to the bottom of the lifting screw.

[0007] In some embodiments of the present application, the lifting assembly further comprises a lifting pipe, the lifting pipe is arranged in the mixing cavity, a lifting channel is formed in the lifting pipe, the lifting screw is rotationally arranged in the lifting channel, the bottom and the top of the lifting channel are respectively communicated to the mixing cavity, the air outlet is arranged corresponding to the bottom opening of the lifting pipe, the lifting channel is used for lifting the powder upwards, and the mixing cavity is used for falling and mixing the powder.

[0008] In some embodiments of the present application, the mixing device further comprises a stirring assembly, the stirring assembly comprises a scattering disc, the scattering disc is fixedly arranged on the outer periphery of the riser pipe, and the riser pipe is rotatable relative to the shell to drive the scattering disc to rotate.

[0009] In some embodiments of the present application, the upper end side wall of the riser pipe is provided with a lifting outlet communicated with the mixing chamber, and the scattering disc is arranged below the lifting outlet in the direction of gravity.

[0010] In some embodiments of the present application, the upper surface of the scattering disc is arranged to be inclined in the direction of gravity from the center to the outer periphery of the scattering disc.

[0011] In some embodiments of the present application, the mixing device further comprises a feeding structure communicated with the mixing chamber, the feeding structure is arranged on the shell, and a part of the feeding structure extends into the mixing chamber, the discharge end of the feeding structure is located above the scattering disc in the direction of gravity, and the projection of the discharge end of the feeding structure in the direction of gravity is located in the scattering disc.

[0012] In some embodiments of the present application, the surface of the scattering disc is provided with a material falling through hole, the material falling through hole is arranged to extend in the radial direction of the scattering disc, the projection of the discharge end of the feeding structure in the direction of gravity is located in the scattering disc, and at least partially overlaps with the material falling through hole in the scattering disc.

[0013] In some embodiments of the present application, the mixing device further comprises a first feeding structure and a second feeding structure communicated with the mixing chamber, the first feeding structure and the second feeding structure are arranged at intervals on the shell, the first feeding structure is used to feed the first kind of powder at a first speed, and the second feeding structure is used to feed the second kind of powder at a second speed, wherein the ratio of the first speed to the second speed is equal to the mixing ratio of the first kind of powder to the second kind of powder.

[0014] In some embodiments of the present application, the mixing device further comprises an entrained bed orifice plate and a stirring assembly, the entrained bed orifice plate is arranged at the bottom of the mixing chamber, the stirring assembly comprises stirring blades, the stirring blades are fixedly arranged on the outer periphery of the bottom end of the riser pipe, and the stirring blades are located above the entrained bed orifice plate, and the riser pipe is rotatable relative to the shell to drive the stirring blades to rotate.

[0015] The cooling gas flow power assembly comprises a circulating air pipe and a power pump, one end of the circulating air pipe is communicated to the top of the mixing chamber, the other end of the circulating air pipe is communicated to the bottom of the mixing chamber, and the power pump is used to provide gas flow power to the circulating air pipe.

[0016] The embodiments of the present application have at least the following beneficial effects: by using the cooling gas flow power assembly, on the one hand, the gas flow power can be provided for the powder gas flow mixing, so that the powder can flow in the form of gas flow under the pushing action of high-pressure gas, and the mixing effect of different powder particles can be achieved in the flow process. On the other hand, the gas flow power can also cool the powder, so as to avoid the adhesion of the solid binder under the action of high temperature, thereby overcoming the problem of fiberization in the mixing process, avoiding the adhesion of the solid binder and other powder particles into a group, achieving the effect of non-fiberized mixing, improving the mixing uniformity, and ensuring that the properties of the mixed powder can meet the process requirements. By vacuumizing the mixing device through the vacuum assembly, a vacuum mixing environment can be provided for the powder. Under the vacuum condition, the powder particles with different particle sizes can fall and mix in the mixing device at the same speed, thereby improving the uniformity of the mixing, overcoming the problem of particle segregation in the falling and mixing process due to the difference in particle size and weight between the powders, improving the stability and uniformity of the mixing, shortening the mixing time, and improving the mixing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] The aspects and advantages described and / or added by the embodiments of the present application will become apparent and easy to understand from the following drawings. It should be noted that the embodiments embodied in the following drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0018] Figure 1 A structural schematic diagram of one example of the mixing device provided by the embodiments of the present application;

[0019] Figure 2 A-A sectional view of Figure 1

[0020] Figure 3 A structural schematic diagram of another example of the mixing device provided by the embodiments of the present application;

[0021] Figure 4 A top view of the mixing cavity in the mixing device provided by the embodiments of the present application.

[0022] Reference signs: 100, mixing device;

[0023] 10, shell; 11, mixing cavity;

[0024] 20, cooling gas flow power assembly; 21, air outlet; 22, circulating air pipe;

[0025] 30, lifting assembly; 31, lifting screw; 32, lifting pipe; 321, lifting channel; 322, lifting outlet; 33, material collecting disc;

[0026] 40, stirring assembly; 41, material scattering disc; 411, material falling through hole; 42, stirring blade;​

[0027] 50, feed structure; 51, first feed structure; 52, second feed structure; 53, feed conduit; 54, screw;

[0028] 60, entrained flow orifice; 61, stationary ring; 62, spoke; 63, bearing. DETAILED DESCRIPTION

[0029] The embodiments will be described below in Figures 1 to 4 The embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar components have the same or similar reference numbers throughout the several figures. The embodiments described below are exemplary only, and are not intended to be limiting of the present application.

[0030] In the description of the present application, it is to be understood that the orientation or positional relationship indicated by terms such as "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the terms "mount", "connect", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] In the description of the present application, it is to be understood that the orientation or positional relationship indicated by terms such as "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the terms "mount", "connect", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the dry battery mixing process, the powder to be mixed can include active materials of positive or negative electrodes, conductive agents, solid binders, etc. Exemplarily, the active materials and conductive agents are usually inorganic particles with small particle sizes, and the particle sizes are usually about 10 μm, while the solid binder can be PTFE (polytetrafluoroethylene) with a particle size of about 500 μm. Therefore, the particle sizes of different powders are quite different, and the mechanical properties of different powders are quite different during the mixing process. The powder with large particle size is usually deposited at the bottom, while the powder with small particle size is left on the surface, thereby causing uneven mixing. At the same time, the solid binder has the characteristic of being sticky at high temperatures, which leads to the fiberization of the powder during the mixing process, which is not conducive to achieving uniform mixing.

[0033] Based on this, please refer to Figures 1 to 3 The present application provides a mixing device, which comprises a shell 10, a cooling gas flow power assembly 20 and a vacuum assembly (not shown). The shell 10 is formed with a mixing cavity 11, the cooling gas flow power assembly 20 is communicated to the mixing cavity 11 for providing cooling gas flow to the mixing cavity 11, and the vacuum assembly is communicated to the mixing cavity 11 for vacuumizing the mixing cavity 11.

[0034] By using the cooling gas flow power assembly 20, on the one hand, the gas flow power can be provided for the gas flow mixing of the powder, so that the powder can flow in the form of gas flow under the pushing action of high-pressure gas, and the mixing of different powder particles can be achieved during the flow process. On the other hand, the gas flow power can also cool the powder, avoiding the stickiness of the solid binder under the action of high temperature, thereby overcoming the fiberization problem during the mixing process, avoiding the adhesion of the solid binder and other powder particles, achieving the effect of non-fiberization mixing, improving the mixing uniformity, and ensuring that the properties of the mixed powder can meet the process requirements. By vacuumizing the mixing device through the vacuum assembly, a vacuum mixing environment can be provided for the powder. Under the vacuum condition, different particle size powder particles can fall and mix in the mixing device at the same speed, thereby improving the uniformity of the mixing, overcoming the particle segregation problem during the falling and mixing process due to the difference in particle size and weight, improving the stability and uniformity of the mixing, shortening the mixing time, and improving the mixing efficiency.

[0035] In some embodiments, the cooling gas flow power assembly 20 comprises a circulating air pipe 22 and a power pump. One end of the circulating air pipe 22 is communicated to the top of the mixing cavity 11, and the other end is communicated to the bottom of the mixing cavity 11. The power pump is used to provide gas flow power to the circulating air pipe 22. The circulating gas flow power can achieve the effects of continuous mixing and continuous cooling of the powder, thereby improving the efficiency of the mixing.

[0036] Exemplarily, the cooling circulating gas flow can be low-temperature nitrogen, carbon dioxide or other inert gas that does not react with the powder, which is not limited here. Alternatively, since PTFE will become sticky at a temperature above 19°C, the temperature of the cooling circulating gas flow can be set to be lower than 19°C, so as to play a role of cooling the powder and avoid the fiberization phenomenon in the mixing process.

[0037] Exemplarily, the vacuum assembly includes a vacuum pump, and the shell 10 of the mixing device can be provided with a vacuum suction port, and the vacuum pump is connected to the vacuum suction port through a pipeline, so as to realize the vacuum suction of the mixing cavity 11.

[0038] In some embodiments, the mixing device further includes a lifting assembly 30, and the lifting assembly 30 includes a lifting screw 31 rotatably arranged in the mixing cavity 11 for lifting the powder upwards and then falling, and the cooling gas flow power assembly 20 includes an air outlet 21 arranged corresponding to the bottom of the lifting screw 31.

[0039] When the mixing cavity 11 is vacuumized, the cooling gas flow in the mixing device is stopped, at this time, the powder can be lifted from the bottom to the top of the mixing cavity 11 through the lifting channel 321 by the lifting action of the lifting screw 31, and the powder can be scattered by the centrifugal action of the lifting screw 31, and the powder can fall at the top of the mixing cavity 11. Since the mixing device is vacuumized, the powder falls in a vacuum condition, which can reduce or eliminate the difference in falling speed between powder particles of different particle sizes, so that powder particles of different particle sizes fall and mix at substantially the same speed, avoiding the phenomenon that large particles fall fast and small particles fall slow, overcoming the segregation problem between particles of different particle sizes, thereby improving the distribution uniformity and stability of the mixing.

[0040] When the cooling gas flow is provided to the mixing cavity 11, by arranging the air outlet 21 at the bottom of the lifting screw 31, an upward gas flow direction can be formed in the mixing cavity 11, which helps to lift the powder from the bottom of the mixing device to the top by the gas flow, so that the powder can start to fall from the top of the mixing device, thereby providing sufficient falling distance for the powder in the falling and mixing process, fully utilizing the space in the mixing device, and improving the mixing effect.

[0041] In some embodiments, the lifting assembly 30 further comprises a lifting pipe 32 arranged in the mixing cavity 11, the lifting pipe 32 is formed with a lifting channel 321, the lifting screw 31 is arranged in the lifting channel 321, the bottom and the top of the lifting channel 321 are respectively communicated with the mixing cavity 11, the air outlet 21 is arranged corresponding to the bottom end opening of the lifting pipe 32, the lifting channel 321 is used for lifting the powder upwards, and the mixing cavity 11 is used for falling and mixing the powder. By arranging the lifting channel 321, the mixing cavity 11 can be isolated, that is, the powder moves upwards through the lifting channel 321 and falls and mixes through the mixing cavity 11, so that the powder in the lifting channel 321 and the powder in the mixing cavity 11 can move without affecting each other, improving the orderliness of the powder mixing process and ensuring that the powder falling in the mixing cavity 11 can be fully mixed.

[0042] In some embodiments, a collecting disc 33 can be arranged at the bottom end opening of the lifting pipe 32, the center of the collecting disc 33 is arranged to be inclined to the gravity direction compared with the outer periphery, that is, the collecting disc 33 is arranged to be conical, which can guide the powder to gather to the bottom end opening position of the lifting pipe 32 from the outside to the inside, and facilitate the powder to be lifted upwards under the action of the lifting screw 31.

[0043] In some embodiments, the mixing device further comprises a stirring assembly 40, the stirring assembly 40 comprises a scattering disc 41, the scattering disc 41 is fixedly arranged at the outer periphery of the lifting pipe 32, and the lifting pipe 32 is rotatable relative to the shell 10 to drive the scattering disc 41 to rotate. By using the rotating action of the scattering disc 41, on the one hand, the powder can be guided to diffuse and move from the lifting channel 321 to the outer periphery, and on the other hand, the powder can be further stirred and dispersed, thereby improving the uniformity and stability of the powder in the mixing process, shortening the mixing time, and thereby improving the mixing efficiency.

[0044] In some embodiments, the upper end side wall surface of the lifting pipe 32 is provided with a lifting outlet 322 communicated with the mixing cavity 11, and the scattering disc 41 is arranged below the lifting outlet 322 along the gravity direction. Figure 2 As shown in FIG. 6, line I shows a moving route of the powder in the mixing cavity 11. By arranging the scattering disc 41 below the lifting outlet 322, the powder is scattered from the lifting outlet 322 under the centrifugal action of the lifting screw 31, and then is dispersed again under the rotating action of the scattering disc 41, thereby improving the stirring and dispersing action of the powder and improving the mixing effect.

[0045] Optionally, the rotation direction of the scattering disc 41 and the lifting screw 31 can be opposite, so that when the powder is scattered from the lifting outlet 322, it has an initial speed along the rotation direction of the lifting screw 31, and when the powder contacts the scattering disc 41, the rotation speed of the powder relative to the scattering disc 41 is the superposition of the initial speed of the powder and the rotation speed of the scattering disc 41, thereby enhancing the dispersion effect of the scattering disc 41 on the powder, which helps to improve the dispersion and stirring effect of the scattering disc 41 on the powder, thereby improving the mixing effect.

[0046] Exemplarily, the lifting pipe 32 and the scattering disc 41 can be fixedly arranged (including integrally arranged or separately arranged), and the lifting pipe 32 drives the scattering disc 41 to rotate synchronously during the rotation of the lifting pipe 32. The lifting pipe 32 and the lifting screw 31 are connected through a bearing 63, for example, the bearing 63 is arranged at the end of the lifting pipe 32, the outer periphery of the bearing 63 is connected with the lifting pipe 32, and the inner periphery of the bearing 63 is connected with the lifting screw 31, so that the lifting screw 31 and the lifting pipe 32 can rotate independently and do not affect each other. Optionally, the lifting screw 31 and the lifting pipe 32 can be driven separately by different driving devices, or can be driven separately by the same driving device through a transmission device, which is not limited here.

[0047] In some embodiments, along the direction from the center to the outer periphery of the scattering disc 41, the upper surface of the scattering disc 41 is arranged to be inclined along the direction of gravity. By arranging the upper surface of the scattering disc 41 to be inclined downward along the direction of gravity, the powder can be guided to fall along the upper surface of the scattering disc 41, achieving the effect of scattering and dispersing the powder.

[0048] In some embodiments, the mixing device further comprises a feeding structure 50 connected to the mixing cavity 11, the feeding structure 50 is arranged in the housing 10, and a part of the feeding structure 50 extends into the mixing cavity 11. The discharge end of the feeding structure 50 is located above the scattering disc 41 along the direction of gravity, and the projection of the discharge end of the feeding structure 50 along the direction of gravity is located in the scattering disc 41. With this arrangement, when the powder is pushed into the mixing cavity 11 from the discharge end of the feeding structure 50, the powder can first fall to the surface of the scattering disc 41 under the action of its own gravity, and can also be dispersed and splashed along the radial direction of the scattering disc 41 under the action of the rotation of the scattering disc 41, achieving the effects of dispersion, stirring and mixing of the powder. By arranging a part of the feeding structure 50 to extend into the mixing cavity 11, the powder can be uniformly distributed in the radial direction of the mixing cavity 11 during feeding, avoiding the situation that most of the powder is concentrated at the outer periphery of the mixing cavity 11 or at the center of the mixing cavity 11, thereby helping to improve the mixing uniformity and mixing effect.

[0049] In some embodiments, the surface of the material spreading plate 41 is provided with a material drop hole 411, and the material drop hole 411 is arranged to extend radially along the material spreading plate 41. The projection of the material discharge end of the feeding structure 50 along the gravity direction is located in the material spreading plate 41, and at least partially overlaps with the material drop hole 411 in the material spreading plate 41. Figure 2 As shown, route II illustrates another path for powder to move within mixing chamber 11. By utilizing dropout holes 411, a portion of the powder can be allowed to fall directly through dropout holes 411, thereby distributing powder uniformly within and outside the spreading tray 41 below the spreading tray 41, preventing the powder from being completely blocked by the spreading tray 41. Similarly, when powder enters mixing chamber 11 from lifting outlet 322, dropout holes 411 can also be utilized to allow a portion of the powder to fall directly, while the remaining portion of the powder moves radially along the spreading tray 41 to the edge of the spreading tray 41 and is then scattered.

[0050] Optionally, the blanking hole 411 is arranged in a fan shape, that is, the width of the blanking hole 411 at one end near the center of the material spreading plate 41 is smaller, and the width of the blanking hole 411 at one end near the edge of the material spreading plate 41 is larger, so as to adapt to the shape of the material spreading plate 41. A plurality of blanking holes 411 can be provided, and the plurality of blanking holes 411 are arranged at equal intervals along the circumference of the material spreading plate 41.

[0051] In some embodiments, the lifting tube 32 is provided with a lifting outlet 322, and the material dropout hole 411 is staggered with the lifting outlet 322. Thus, when the powder is spilled from the lifting outlet 322, the path of the powder to the material dropout hole 411 can be extended, preventing excessive powder from spilling from the lifting outlet 322 and falling directly from the material dropout hole 411. This arrangement allows the spreading plate 41 to fully exert its stirring and dispersing function, improving the mixing effect.

[0052] In some embodiments, the mixing device further includes a first feeding structure 51 and a second feeding structure 52 connected to the mixing chamber 11. The first feeding structure 51 and the second feeding structure 52 are spaced apart on the housing 10. The first feeding structure 51 is used to introduce the first type of powder at a first speed, and the second feeding structure 52 is used to introduce the second type of powder at a second speed. The ratio of the first speed to the second speed is equal to the mixing ratio of the first type of powder to the second type of powder. By controlling the feeding speeds of the first type of powder and the second type of powder, the two types of powder can be fed evenly in the desired ratio. The feeding ratio of the two types of powder can be maintained at the same level as the target mixing ratio per unit time, thereby improving the mixing efficiency, achieving the effect of evenly mixing the two types of powder, and improving the uniformity and stability of the mixing.

[0053] Optionally, the powder to be mixed can not be limited to two kinds, for example, there can be three, four or more, the number of feeding structure 50 can be set to three, four, etc. according to the mixing requirements, and multiple feeding structures 50 can be arranged at equal intervals along the circumference of the shell 10. Alternatively, when the number of feeding structures 50 is less than the number of powder types, different powders can also be fed in batches in sequence, and the ratio of the feeding speed of the same batch of different powders is the same as the mixing ratio of the powder. For example, the feeding structure 50 can be realized in the form of a push rod, a screw 54, etc. arranged in the feeding pipe 53, and the feeding speed can be controlled by controlling the rotation speed of the screw.

[0054] For example, the feeding structure 50 can be used in cooperation with the spreading disc 41, for example, the spreading disc 41 in the rotating mixing device is rotated to the second feeding structure 52 after receiving the first feeding structure 51, so that the first powder and the second powder are mixed in the spreading disc 41. The continuous rotation of the spreading disc 41 can make the powder fall from the spreading disc 41 and mix. By setting the rotation of the spreading disc 41 and cooperating with the feeding action of the first feeding structure 51 and the second feeding structure 52, the spreading disc 41 can be used to sequentially receive and mix the powders of the two feeding structures 50. In this way, the powders can be preliminarily mixed during the feeding process, and then the mixing effect can be realized by subsequent processes such as low-temperature gas fluidization mixing and mixing under vacuum conditions. Preliminary mixing of the powder helps to further improve the mixing effect and shorten the subsequent mixing process, thereby improving the mixing efficiency.

[0055] In some embodiments, the mixing device further comprises a gas flow bed hole plate 60 arranged at the bottom of the mixing cavity 11. By using the gas flow bed hole plate 60, the powder particles can be blocked, so as to collect the mixed powder in the mixing cavity 11, and avoid loss caused by the flow of the powder particles under the action of the gas flow.

[0056] Optionally, please refer to Figure 3 and Figure 4 The gas flow bed hole plate 60 can be a filter cloth or filter screen structure with holes, which can allow gas flow but block powder particles, thereby collecting the powder. Optionally, the center of the gas flow bed hole plate 60 is provided with a fixed ring 61, the fixed ring 61 is connected to the outer periphery of the gas flow bed hole plate 60 through a plurality of spokes 62, and the fixed ring 61 and the outer periphery of the riser 32 are supported and connected through a bearing 63. In this way, the lower end of the riser 32 can be supported and fixed, so that the riser 32 can rotate relative to the fixed ring 61, and the stability of the riser 32 during rotation can be improved.

[0057] In some embodiments, please continue to refer to Figure 3 and Figure 4The mixing device further comprises a stirring assembly 40, the stirring assembly 40 comprises stirring blades 42, the stirring blades 42 are fixedly arranged at the outer periphery of the bottom end of the riser pipe 32, and the stirring blades 42 are located above the air flow bed hole plate 60, and the riser pipe 32 is rotatable relative to the shell 10 to drive the stirring blades 42 to rotate. The rotation of the riser pipe 32 can drive the stirring blades 42 to rotate, on the one hand, it can drive the material powder to collect towards the center along the outer periphery of the air flow bed hole plate 60, so as to guide the material powder to approach the riser pipe 32 and enter the lifting channel 321 from the bottom of the riser pipe 32, on the other hand, it can clean and destroy the air holes formed on the upper surface of the air flow bed hole plate 60, so as to avoid the accumulation of material powder on the outer periphery of the air holes due to the formation of air holes on the surface of the air flow bed hole plate 60, and to homogenize the fluidization effect. Exemplarily, the stirring blades are arranged in an arc shape and extend along the radial direction of the air flow bed hole plate 60.

[0058] In the description of the present application, if the description of the terms "one embodiment", "some examples", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" appears, it means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the description of the present application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

[0060] In the description of the present application, if the patent name appears as "and", it means "and" relationship, not "or" relationship. For example, the patent name is "one kind of A, B", which means that the content claimed by the present application is: the technical solution of the subject name A and the technical solution of the subject name B.

Claims

1. A compounding device, characterized by: Comprising a housing, a mixing cavity is formed in the housing; a cooling air flow power assembly is communicated to the mixing cavity, for providing cooling air flow to the mixing cavity; a vacuum assembly is communicated to the mixing cavity, for vacuumizing the mixing cavity.

2. A mixing device according to claim 1, characterised in that: The mixing device further comprises a lifting assembly, the lifting assembly comprises a lifting screw, the lifting screw is rotationally arranged in the mixing cavity, for driving the powder to lift up and then fall down, the cooling air flow power assembly comprises an air outlet, the air outlet is arranged corresponding to the bottom of the lifting screw.

3. A mixing device according to claim 2, characterised in that: The lifting assembly further comprises a lifting pipe, the lifting pipe is arranged in the mixing cavity, a lifting channel is formed in the lifting pipe, the lifting screw is rotationally arranged in the lifting channel, the bottom and the top of the lifting channel are communicated to the mixing cavity respectively, the air outlet is arranged corresponding to the bottom opening of the lifting pipe, the lifting channel is used for lifting the powder up, and the mixing cavity is used for mixing the powder falling down.

4. A mixing device according to claim 3, wherein: The mixing device further comprises a stirring assembly, the stirring assembly comprises a scattering disc, the scattering disc is fixedly arranged on the outer periphery of the lifting pipe, and the lifting pipe is rotatable relative to the housing to drive the scattering disc to rotate.

5. A mixing device according to claim 4, wherein: The upper end side wall surface of the lifting pipe is provided with a lifting outlet communicated to the mixing cavity, and the scattering disc is arranged below the lifting outlet along the gravity direction.

6. The apparatus of claim 4, wherein: The upper surface of the scattering disc is arranged to be inclined along the gravity direction in the center-to-outer periphery direction of the scattering disc.

7. The apparatus of claim 4, wherein: The mixing device further comprises a feeding structure communicated to the mixing cavity, the feeding structure is arranged on the housing, and a part of the feeding structure extends into the mixing cavity, the discharge end of the feeding structure is located above the scattering disc along the gravity direction, and the projection of the discharge end of the feeding structure along the gravity direction is located in the scattering disc.

8. A mixing device according to claim 7, characterised in that: The surface of the scattering disc is provided with a material falling through hole, the material falling through hole is arranged to extend along the radial direction of the scattering disc, the projection of the discharge end of the feeding structure along the gravity direction is located in the scattering disc, and at least partially overlaps the material falling through hole in the scattering disc.

9. A mixing device according to any one of claims 1 to 8, characterised in that: The mixing device further comprises a first feeding structure and a second feeding structure communicated to the mixing cavity, the first feeding structure and the second feeding structure are arranged at intervals on the housing, the first feeding structure is used to feed the first kind of powder at a first speed, and the second feeding structure is used to feed the second kind of powder at a second speed, wherein the ratio of the first speed to the second speed is equal to the mixing ratio of the first kind of powder to the second kind of powder.

10. The apparatus of claim 3, wherein: The mixing device further comprises an air flow bed hole plate and a stirring assembly, the air flow bed hole plate is arranged at the bottom of the mixing cavity, the stirring assembly comprises a stirring blade, the stirring blade is fixedly arranged on the outer periphery of the bottom end of the lifting pipe, and the stirring blade is located above the air flow bed hole plate, and the lifting pipe is rotatable relative to the housing to drive the stirring blade to rotate. The cooling air flow power assembly comprises a circulating air pipe and a power pump, one end of the circulating air pipe is communicated to the top of the mixing cavity, the other end is communicated to the bottom of the mixing cavity, and the power pump is used for providing air flow power to the circulating air pipe.

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