Industrial powder material mixing device

Abstract

The utility model provides an industrial powder material mixing device which comprises a material supply unit, a material mixing unit, a material mixing unit, a material mixing unit and a material mixing unit, wherein the material supply unit is used for providing main materials and auxiliary materials of industrial powder materials; the material mixing unit is connected with the material supply unit and is used for uniformly mixing the industrial powder main material and the industrial powder auxiliary material provided by the material supply unit; and the power unit is connected with the material mixing unit and is used for providing power for conveying the industrial powder main material and the auxiliary material from the material supply unit to the material mixing unit. According to the technical scheme, the mixing device integrates the feeding function and the mixing function, mixing and feeding integration is achieved, and therefore the input cost of auxiliary equipment of the airflow mixer is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lithium battery manufacturing, in particular to an industrial powder material mixing device. BACKGROUND

[0002] Currently, the mechanical mixing equipment is generally used in the negative electrode industry of lithium ion battery to mix graphite materials. However, the mechanical mixing equipment has the problems of long mixing time, high energy consumption, limited capacity, and low production efficiency.

[0003] Therefore, it is necessary to provide a more effective and reliable technical solution to solve the problems in the current lithium battery negative electrode material mixing device. CONTENT OF THE INVENTION

[0004] The technical problem to be solved by the present application is that the current mixing device for industrial powder of lithium battery has the problems of long mixing time, high energy consumption, low production efficiency, and high investment cost.

[0005] The present application provides an industrial powder material mixing device, which comprises: a feeding unit for providing main materials and auxiliary materials of industrial powder; a mixing unit connected with the feeding unit, for uniformly mixing the main materials and auxiliary materials of industrial powder provided by the feeding unit; and a power unit connected with the mixing unit, for providing power to transport the main materials and auxiliary materials of industrial powder from the feeding unit to the mixing unit.

[0006] In some embodiments of the present application, the mixing unit comprises: a mixing bin for accommodating the main materials and auxiliary materials of industrial powder; an air flow mixer located at the bottom of the mixing bin, for spraying gas into the mixing bin to mix the main materials and auxiliary materials of industrial powder in the mixing bin; and a dust collector located at the top of the mixing bin, for filtering the main materials and auxiliary materials of industrial powder and discharging the filtered gas into the mixing bin.

[0007] In some embodiments of the present application, the air flow mixer comprises: a discharge cone valve and a valve seat, the discharge cone valve and the valve seat form a sealing pair and are coaxially fixed and sealed at the bottom of the mixing bin, the discharge cone valve is located in the mixing bin with the tapered end upward, and the valve seat comprises a hole plate bearing the discharge cone valve, the hole plate is inclined to the discharge port of the valve seat.

[0008] In some embodiments of the present application, the mixing unit further comprises: a first blowing device surrounding the side wall of the mixing bin for spraying gas to the inner wall of the mixing bin; and a second blowing device surrounding the side wall of the mixing bin and located below the first blowing device for spraying gas to the inner wall of the mixing bin and the hole plate.

[0009] In some embodiments of this application, the power unit is connected to the dust collector of the mixing unit via a conveying pipe.

[0010] In some embodiments of this application, the dust collector has two exhaust ports, one of which is connected to the conveying pipe, and the other exhaust port is equipped with a pneumatic switching valve.

[0011] In some embodiments of this application, the mixing unit further includes several vibrating air hammers disposed on the side wall of the mixing silo and evenly distributed circumferentially along the side wall of the mixing silo.

[0012] In some embodiments of this application, a feeding switching valve is provided at one end of the conveying pipe near the mixing silo.

[0013] In some embodiments of this application, the feeding unit includes a ton bag containing industrial powder material and a ton bag feeding hopper for unloading.

[0014] In some embodiments of this application, the feeding unit includes a main material buffer bin and an auxiliary material buffer bin, wherein the main material buffer bin and the auxiliary material buffer bin respectively contain the main material and auxiliary material of the industrial powder material to be mixed.

[0015] Compared with the prior art, the beneficial effects of the technical solution of this application include:

[0016] The mixing device of this application integrates the feeding function and the mixing function, realizing the integration of mixing and feeding, thereby reducing the investment cost of auxiliary equipment for airflow mixers;

[0017] The technical solution of this application uses an airflow mixer to replace the mechanical mixer in the existing process for industrial powder mixing. The airflow mixer has a short mixing time, low energy consumption, and improves mixing efficiency while reducing the operating cost of the equipment.

[0018] The orifice plate in this application is designed to be inclined. Compared with the horizontal design in the existing process, it eliminates the design dead corners where material is easy to accumulate, thereby greatly reducing the material residue at the orifice plate.

[0019] The technical solution of this application provides the first jetting device, the second jetting device, and the vibrating air hammer on the side wall of the mixing silo, which can prevent the industrial powder materials in the mixing silo from bridging, arching, sticking to the wall, and residue. Attached Figure Description

[0020] The following accompanying drawings describe in detail the exemplary embodiments disclosed in this application. The same reference numerals denote similar structures in several views of the drawings. Those skilled in the art will understand that these embodiments are non-limiting and exemplary, and the drawings are for illustrative purposes only and are not intended to limit the scope of this application. Other embodiments may similarly fulfill the inventive intent of this application. It should be understood that the drawings are not drawn to scale. Wherein:

[0021] Figure 1 This is a schematic diagram of the mixing device in the industrial powder material mixing device described in the embodiments of this application;

[0022] Figure 2 This is a schematic diagram of the structure of the mixing device in the industrial powder material mixing device described in some embodiments of this application;

[0023] Figure 3 This is a schematic diagram of the structure of the mixing device in the industrial powder material mixing device described in some other embodiments of this application;

[0024] Figure 4 This is a schematic diagram of the mixing unit in the industrial powder material mixing device described in the embodiments of this application;

[0025] Figure 5 This is a schematic diagram of the airflow mixer in the industrial powder material mixing device described in the embodiments of this application. Detailed Implementation

[0026] The following description provides specific application scenarios and requirements for this application, intended to enable those skilled in the art to make and use the content of this application. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this application. Therefore, this application is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0027] The technical solution of this application will be described in detail below with reference to the embodiments and accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the mixing device in the industrial powder material mixing device described in the embodiments of this application. Figure 2 This is a schematic diagram of the structure of the mixing device in the industrial powder material mixing device described in some embodiments of this application. Figure 3 This is a schematic diagram of the mixing device in an industrial powder material mixing device described in other embodiments of this application.

[0029] refer to Figure 1 , Figure 2 and Figure 3As shown in the embodiment of this application, the industrial powder material mixing device 1100 includes: a feeding unit 1110 for providing main and auxiliary materials of industrial powder material; a mixing unit 1120 connected to the feeding unit 1110 for mixing the main and auxiliary materials of industrial powder material provided by the feeding unit 1110 to form a mixed material; and a power unit 1130 connected to the mixing unit 1120 for providing power to transport the main and auxiliary materials of industrial powder material from the feeding unit 1110 to the mixing unit 1120.

[0030] refer to Figure 1 As shown, the embodiments of this application do not limit the manner in which the feeding unit 1110 supplies industrial powder materials. The feeding unit 1110 can supply industrial powder materials in any manner suitable in the art. For example, refer to... Figure 2 As shown, in some embodiments of this application, the feeding unit 1110 supplies industrial powder materials via a feeding station. The feeding unit 1110 includes a ton bag 1111 containing the industrial powder materials and a ton bag feeding hopper 1112 for unloading. For example, see reference... Figure 3 As shown, in some other embodiments of this application, the feeding unit 1110 supplies industrial powder materials in the form of raw materials supplied through a storage silo. The feeding unit 1110 includes a main material buffer silo 1113 and an auxiliary material buffer silo 1114, in which the main material buffer silo 1113 and the auxiliary material buffer silo 1114 respectively contain the main material and auxiliary material of the industrial powder materials to be mixed.

[0031] In some embodiments of this application, the feeding unit 1110 and the mixing unit 1120 are connected by a conveying pipe 1116, and a feeding switching valve 1115 is also provided on the end of the conveying pipe 1116 near the mixing silo.

[0032] In some embodiments of this application, the power unit 1130 includes, but is not limited to, a negative pressure fan. The power unit 1130 draws industrial powder materials supplied by the feeding unit 1110 to the mixing unit 1120 by means of air extraction.

[0033] In some embodiments of this application, the power unit 1130 is connected to the dust collector of the mixing unit 1120 via a conveying pipe 1131.

[0034] The mixing device 1100 in this application uses a large-capacity (20 cubic meters or more) mixing unit 1120 to draw the main and auxiliary materials of the industrial powder to be mixed from the corresponding buffer bins to the mixing unit 1120 according to the set ratio, and then mix them through an airflow mixer.

[0035] Figure 4 This is a schematic diagram of the mixing unit in the industrial powder material mixing device described in the embodiments of this application.

[0036] refer to Figure 4 As shown, in some embodiments of this application, the mixing unit 1120 includes: a mixing silo 1121 for containing the main and auxiliary materials of the industrial powder; a dust collector 1122 located at the top of the mixing silo 1121 for filtering the main and auxiliary materials of the industrial powder and discharging filtered gas entering the mixing silo 1121; and an airflow mixer 1140 located at the bottom of the mixing silo 1121 for spraying air into the mixing silo 1121 to mix the main and auxiliary materials of the industrial powder in the mixing silo 1121.

[0037] In some embodiments of this application, the mixing hopper 1121 includes an integrally connected cylindrical first portion and a conical second portion. The conical second portion facilitates the discharge of the mixture.

[0038] In some embodiments of this application, the dust collector 1122 is used to filter the industrial powder material into the mixing silo 1121 when the power unit 1130 extracts the industrial powder material, and to filter and discharge the compressed air entering the mixing silo to the outside of the silo.

[0039] In some embodiments of this application, the dust collector 1122 has two exhaust ports, one of which is connected to the conveying pipe 1131, and the other exhaust port is equipped with a pneumatic switching valve 1132. The pneumatic switching valve 1132 is closed when the mixing silo 1121 is being fed, and opened when the mixing silo 1121 is being mixed. After the power unit 1130 (negative pressure fan) is turned on, the mixing silo 1121 is drawn to a certain negative pressure through the conveying pipe 1131 and the dust collector 1122. Under negative pressure, industrial powder materials are drawn from the feeding unit 1110 into the mixing silo 1121, thereby realizing the automatic feeding function of the mixing unit 1120 and eliminating the need for a separate feeding device. The mixing and feeding functions can be seamlessly switched by PLC control.

[0040] Continue to refer to Figure 4As shown in some embodiments of this application, the mixing unit 1120 further includes: a first blowing device 1123 surrounding the sidewall of the second part of the mixing silo 1121. The first blowing device 1123 has a first air ring 1124 surrounding the second part of the mixing silo 1121 and a plurality of first nozzles 1125 evenly distributed on the first air ring 1124. The first blowing device 1123 takes in air through the first air ring 1124 and blows air into the mixing silo 1121 through the first nozzles 1125. A second blowing device 1126 surrounds the side wall of the second portion of the mixing silo 1121 and is located below the first blowing device 1123. The second blowing device 1126 has a second air ring 1127 surrounding the second portion of the mixing silo 1121 and a plurality of second nozzles 1128 evenly distributed on the second air ring 1127. The second blowing device 1126 intakes air through the second air ring 1127 and blows compressed air onto the inner wall of the mixing silo 1121 through the second nozzles 1128. The first blowing device 1123 assists in mixing industrial powder materials in the mixing silo 1121 when the airflow mixer 1140 is working, preventing the industrial powder materials from caking and adhering to the side wall of the mixing silo 1121 due to poor flowability. The second blowing device 1126 assists in unloading the mixing silo 1121, preventing industrial powder material residue.

[0041] In some embodiments of this application, the first nozzle 1125 is directed toward the bottom of the mixing hopper 1121. The jet direction of the first nozzle 1125 is adjusted according to the angle of the hopper cone to ensure that the hopper wall can be purged. Generally, the angle with the horizontal plane is 50-70 degrees and can be adjusted by a PLC. The number of the first nozzle 1125 can be set as needed, typically six or more.

[0042] In some embodiments of this application, the second nozzle 1128 is directed toward the bottom of the mixing hopper 1121. The jet direction of the second nozzle 1128 is adjusted according to the angle of the hopper cone to ensure that the hopper wall and the orifice plate can be purged. Generally, the angle with the horizontal plane is 50-70 degrees and can be adjusted by a PLC. The number of the second nozzle 1128 can be set as needed, typically six or more.

[0043] In some embodiments of this application, the airflow mixer 1140 can operate alternately with the first jetting device 1123 and the second jetting device 1126.

[0044] Continue to refer to Figure 4As shown, in some embodiments of this application, the mixing unit 1120 further includes: a plurality of vibrating hammers 1129, disposed on the side wall of the second part of the mixing silo 1121, and evenly distributed circumferentially along the side wall of the second part of the mixing silo 1121. The plurality of vibrating hammers 1129 are used to pound the side wall of the mixing silo 1121 to prevent materials from bridging or arching during the discharge process, and to facilitate the smooth discharge of materials and residual materials. The number of vibrating hammers 1129 is, for example, three or more.

[0045] In the technical solution of this application, the cooperation of the first blowing device 1123, the second blowing device 1126 and the vibrating hammer 1129 can prevent the industrial powder material in the mixing silo 1121 from bridging, arching, sticking to the wall and leaving residue.

[0046] Figure 5 This is a schematic diagram of the airflow mixer in the industrial powder material mixing device described in the embodiments of this application.

[0047] refer to Figure 5 As shown in some embodiments of this application, the airflow mixer 1140 includes a discharge cone valve 1141 and a valve seat 1142. The discharge cone valve 1141 and the valve seat 1142 form a sealing pair and are coaxially and fixedly sealed at the bottom of the mixing hopper 1121. The discharge cone valve 1141 is located inside the mixing hopper 1121 with its cone end facing upward. The valve seat 1142 includes an orifice plate 1143 that supports the discharge cone valve 1141. The orifice plate 1143 is inclined toward the outlet 1144 of the valve seat 1142. The orifice plate is fixedly welded to a flange and is inclined downward toward the outlet of the valve seat 1142 to prevent the mixture from remaining at the orifice plate during the discharge process.

[0048] In some embodiments of this application, the angle between the perforated plate 1143 and the horizontal plane is not less than 20 degrees, for example, 20-30 degrees. In the technical solution of this application, since the perforated plate 1143 is designed with an inclination, compared with the horizontal design in the existing process, the design dead corner that is easy to accumulate material is eliminated, thereby greatly reducing the material residue at the perforated plate 1143.

[0049] Continue to refer to Figure 5As shown, the airflow mixer 1140 further includes: an inlet control valve 1145; an air chamber 1146 connected to the inlet control valve 1145; a nozzle 1148 disposed on the orifice plate 1143 and connected to the air chamber 1146 via an inlet branch pipe 1147; and a cylinder 1149 disposed at the bottom of the valve seat 142. Compressed gas enters the air chamber 1146 through the inlet control valve 1145 and is then expelled upwards through the inlet branch pipe 1147 and the nozzle 1148. The high-pressure airflow causes the industrial powder material in the mixing bin 1121 to tumble and mix. The cylinders 1149 serve as power units, and the programmable logic controller controls the number of cylinders 1149 that are opened, thereby controlling the number of nozzles 1148 that are opened. Each cylinder controls the opening and closing time of the corresponding nozzle to achieve the purpose of uniformly mixing the main and auxiliary materials of the industrial powder.

[0050] In some embodiments of this application, the orifice plate 1143 is provided with countersunk holes corresponding to the nozzle 1148 for mounting the nozzle 1148, which is fixed by countersunk bolts. The spray angle and nozzle orifice diameter of the nozzle 1148 can be changed according to the characteristics of different industrial powders, which is very convenient for industrial powders that are frequently mixed with multiple materials.

[0051] The technical solution of this application uses an airflow mixer to replace the mechanical mixer in the existing process for material mixing. The airflow mixer has a short mixing time, low energy consumption, and improves mixing efficiency while reducing equipment operating costs. The airflow mixer mainly utilizes the kinetic energy generated by the rapid expansion of compressed air when it releases pressure to mix materials in the mixing hopper. Compressed air is injected into the mixing hopper in a pulse manner through the nozzle of the airflow mixer with a set pulse width and interval time. This causes the materials to spiral upward, move, tumble, and fall with the airflow, thereby achieving rapid and uniform mixing of materials. It not only has a short mixing time and low energy consumption, but can also adapt to the mixing of large quantities of materials. During the mixing process, the incoming compressed air is filtered by a dust collector at the top of the mixing hopper and then discharged from the mixing hopper. The mixed materials are filtered by the dust collector and then recycled back into the mixing hopper.

[0052] Lithium-ion battery industrial powders require high cleanliness control. There are many types of industrial powders, and the types of materials to be mixed often need to be changed. Therefore, reducing the amount of residual material in the mixing silo and airflow mixer is crucial for lithium-ion battery industrial powders. The technical solution of this application, through optimized structural and configuration designs (the first blowing device 1123, the second blowing device 1126, the vibrating hammer 1129, and the inclined perforated plate 1143), allows the mixed material to be automatically discharged from the airflow mixer while simultaneously achieving maximum automatic cleaning of residual material. This eliminates the need for manual cleaning or hydraulic washing, thereby not only improving the working efficiency of the airflow mixer but also significantly reducing maintenance costs.

[0053] For the feeding process of airflow mixers, existing airflow mixers or mechanical mixers generally require separate feeding equipment. However, the technical solution of this application sets up a pneumatic switching valve 1132 and a feeding switching valve 1115. By switching the pneumatic switching valve 1132 and the feeding switching valve 1115, the dust collector 1122 can have both the function of dust removal and exhaust during mixing and the function of exhaust during feeding. Therefore, the mixing and feeding unit 1100 of the technical solution of this application integrates the feeding function and the mixing function into one, realizing the integration of mixing and feeding, thereby reducing the investment cost of auxiliary equipment for airflow mixers.

[0054] In some embodiments of this application, the working process of the mixing device 1100 includes: a feeding unit 1110 providing industrial powder materials; a power unit 1130 conveying the industrial powder materials from the feeding unit 1110 to the mixing unit 1120; and the mixing unit 1120 mixing the industrial powder materials provided by the feeding unit 1110.

[0055] The process by which the power unit 1130 transports the industrial powder material from the feeding unit 1110 to the mixing unit 1120 includes: when the mixing silo 1121 is being fed, the discharge cone valve 1141, the airflow mixer 1140, the vibrating hammer 1129, the first jet blowing device 1123, and the second jet blowing device 1126 are all in the closed state. At this time, the pneumatic switching valve 1132 is closed, and the air inlet control valve of the airflow mixer 1140 is opened, allowing the air chamber 1146 of the airflow mixer 1140 to be filled with compressed air. The feeding switching valve 1115 is then opened, and the dust collector 1122, the power unit 1130, the main material rotary valve of the main material buffer silo 1113, the main material discharge valve, and the main material accelerator are opened in sequence. The power unit 1130 first draws the mixing silo 1121 to a certain negative pressure through the conveying air duct 1131 and the dust collector 1122, creating a certain negative pressure difference between the front and rear ends of the conveying pipe 1116. Through this negative pressure difference, the main material in the main material buffer silo 1113 and the conveying air are mixed and then drawn together along the conveying pipe 1116 into the mixing silo 1121. After the main material and the conveying air entering the mixing silo 1121 are separated and filtered by the dust collector 1122, the main material is collected in the mixing silo 1121, and the conveying air is discharged into the atmosphere by the dust collector 1122. Similarly, the auxiliary material is drawn from the auxiliary material buffer silo 1114 into the mixing silo 1121 through the auxiliary material discharge valve, auxiliary material rotary valve, and auxiliary material accelerator of the auxiliary material buffer silo 1114 via the conveying pipe 1115. Different main and auxiliary materials can be simultaneously conveyed to the mixing silo 1121 according to the mixing process requirements, or they can be conveyed to the mixing silo 1121 in sequence by switching between the main material discharge valve and the auxiliary material discharge valve; they can be conveyed through a single conveying pipe 1116, or separately through individual conveying pipes 1116. The total feed rate of the mixing silo 1121 should not exceed 60%-70% of the silo's capacity. After the mixing silo 1121 is fully fed, the valves of the main material buffer silo and the auxiliary material buffer silo, as well as the power unit 1130, are closed sequentially. The feeding process is automatically controlled by a PLC.

[0056] The mixing unit 1120 mixes the industrial powder materials provided by the feeding unit 1110, including: after the mixing silo 1121 is fed, the pneumatic switching valve 1132 is opened and the feeding switching valve 1115 is closed. At this time, the dust collector 1122 is still in operation. The airflow mixer 1140 under the mixing silo 1121 starts working. Several nozzles of the airflow mixer 1140 are opened in turn according to the set pulse width (1-3 seconds) and pulse interval time (5-9 seconds). (1-4 nozzles can be started simultaneously according to the material characteristics and mixing time requirements. Compressed air enters the mixing silo 1121 through the air chamber 1146 and nozzle 1148 of the airflow mixer 1140 at the set pressure (2-5 bar). The material at the bottom of the mixing silo 1121 rises, tumbles and falls with the compressed airflow, so that the material can be quickly and evenly mixed. The mixing process is automatically controlled by PLC and no manual intervention is required after it is started.

[0057] During the mixing process, the first spraying device 1123 can provide assistance. Specifically, for example, when the industrial powder material has poor flowability, such as when the main material has a high surface moisture content (above 5%), or when the proportion of asphalt mixed in the main material exceeds 15%, the first spraying device 1123 is activated for approximately 2-3 seconds after the airflow mixer 1140 finishes spraying. One to three first nozzles 1125 can be activated at a time. Compressed air passes through the first air ring 1124 and enters the first nozzles 1125 within a set time, then sprays downwards along the side wall of the mixing hopper 1121 onto the industrial powder material with poor flowability. This accelerates the material's circulation and prevents the material's descent speed from slowing down, thus affecting the mixing uniformity. The activation time of the first spraying device 1123 during the mixing process does not exceed the pulse interval time of the airflow mixer 1140. When the industrial powder material has good flowability, it is not necessary to activate the first spraying device 1123. The auxiliary function of the first blowing device 1123 is determined by the process engineer based on the material's flowability. The engineer decides whether to activate the flow-aiding function of the first blowing device 1123. Once activated, the function module will participate in the mixing process through automatic control via the PLC.

[0058] After mixing is complete, the nozzles of the airflow mixer 1140 are closed, the dust collector 1122 stops working, the discharge cone valve 1141 is opened, and the mixed material is discharged from the discharge port 1144. At the same time, the first jet blowing device 1123 and the second jet blowing device 1126 are turned on according to the set pulse time (the turning time and interval can be adjusted according to actual needs), and the three vibrating hammers 1129 are turned on at set times to pound, fluidize and vibrate the material, so as to prevent the material from bridging or arching at the cone part during the discharge process, which helps the material and residual material to be discharged smoothly.

[0059] In the final stage of unloading, the first blowing device 1123, the second blowing device 1126, and the vibrating hammer 1129 primarily clean and discharge residual materials. The second blowing device 1126 further agitates and blows away any material accumulation at the orifice plate, ensuring automatic removal of residual material. The first blowing device 1123 primarily cleans any material remaining on the inner wall of the mixing silo 1121. Combined with the hammering action of the vibrating hammer 1129 on the side wall of the mixing silo, the automatic removal capability of residual materials on the walls and orifice plate of the mixing silo 1121 is further enhanced, thus meeting the cleanliness requirements for changing different types of mixed materials in the lithium battery industry. After discharge, the vibrating hammer 1129, the first blowing device 1123, the second blowing device 1126, and the discharge cone valve 1141 are shut off. If the next mixing requires a different material, the vibrating hammer 1129, the first blowing device 1123, and the second blowing device 1126 can continue to work for a period of time (1-5 minutes) to thoroughly blow away and clean the residual material in the hopper, thereby ensuring the cleanliness of the material to be mixed next time.

[0060] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can implement the applications in this application by adopting alternative configurations based on the embodiments in this application. Therefore, the embodiments of this application are not limited to those embodiments precisely described in the application.

Claims

1. An industrial powder material mixing device, characterized in that, include: The feeding unit is used to provide the main and auxiliary materials for industrial powder materials; The mixing unit is directly connected to the feeding unit via a conveying pipe, and mixes the main and auxiliary industrial powder materials provided by the feeding unit evenly. A power unit, connected to the mixing unit, is used to provide power to transport the main and auxiliary materials of the industrial powder from the feeding unit to the mixing unit.

2. The mixing device according to claim 1, characterized in that, The mixing unit includes a mixing silo for containing the main and auxiliary materials of the industrial powder material; An airflow mixer, located at the bottom of the mixing silo, is used to spray gas into the mixing silo to mix the main and auxiliary industrial powder materials in the mixing silo; A dust collector, located at the top of the mixing silo, is used to filter the main and auxiliary materials of the industrial powder and to filter and discharge the gas entering the mixing silo.

3. The mixing device according to claim 2, characterized in that, The airflow mixer includes a discharge cone valve and a valve seat. The discharge cone valve and the valve seat form a sealing pair and are coaxially and fixedly sealed at the bottom of the mixing hopper. The discharge cone valve is located inside the mixing hopper with its cone end facing upward. The valve seat includes an orifice plate that supports the discharge cone valve. The orifice plate is inclined toward the discharge port of the valve seat.

4. The mixing device according to claim 3, characterized in that, The mixing unit further includes: The first jetting device surrounds the side wall of the mixing silo and is used to jet air onto the inner wall of the mixing silo. The second jetting device surrounds the side wall of the mixing silo and is located below the first jetting device, and is used to jet air onto the inner wall of the mixing silo and the orifice plate.

5. The mixing device according to claim 2, characterized in that, The power unit is connected to the dust collector of the mixing unit via a conveying pipeline.

6. The mixing device according to claim 5, characterized in that, The dust collector has two exhaust ports, one of which is connected to the conveying pipeline, and the other exhaust port is equipped with a pneumatic switching valve.

7. The mixing device according to claim 2, characterized in that, The mixing unit also includes several vibrating air hammers, which are disposed on the side wall of the mixing silo and are evenly distributed along the circumference of the side wall of the mixing silo.

8. The mixing device according to claim 2, characterized in that, A feeding switching valve is provided at one end of the conveying pipe near the mixing silo.

9. The mixing device according to claim 1, characterized in that, The feeding unit includes ton bags containing industrial powder materials and a ton bag feeding hopper for unloading.

10. The mixing device according to claim 1, characterized in that, The feeding unit includes a main material buffer bin and an auxiliary material buffer bin, which respectively contain the main material and auxiliary material of the industrial powder material to be mixed.

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