Jet mill and lithium battery cathode material asphalt crushing system with cooling function

Abstract

The utility model discloses a jet mill and a lithium battery cathode material asphalt crushing system with a cooling function, and relates to the technical field of jet mills, the jet mill comprises a crushing chamber, a feed pipe, a discharge pipe, a grading wheel and a separation chamber, the separation chamber is mounted at the upper end of the crushing chamber, the discharge pipe is arranged on one side of the separation chamber, the grading wheel is arranged in the separation chamber, and the discharge pipe is arranged on the other side of the separation chamber. The crushing chamber comprises an outer cavity and an inner cavity arranged on the inner side of the outer cavity, the inner cavity communicates with the outer cavity, a feeding pipe and a first air inlet pipe are arranged on the outer wall of the outer cavity, and the first air inlet pipe is used for introducing cold air into the outer cavity. According to the utility model, the equipment can be cooled, so that the temperature in the crushing chamber is kept within a certain range, the original characteristics of the crushing chamber are kept when heat-sensitive substances are crushed, and the air inlet temperature can be adjusted according to the temperature of the discharge pipe, so that the cold air has larger cooling capacity when reaching the separation chamber, and the grading wheel can be cooled; the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of air flow pulverizers, in particular to an air flow pulverizer and a lithium battery negative electrode material asphalt pulverizing system with a cooling function. Background Art

[0002] A jet mill is a device that pulverizes materials under the influence of high-speed airflow through particle-to-particle collisions, the impact and shearing effects of the airflow on the material, and the impact, friction, and shearing between the material and other components. Currently, the most commonly used jet mills in industry include jet, circulating, flat, and fluidized bed types. Compared with mechanical mills, jet mills offer greater pulverization intensity, high energy efficiency, and a simpler structure. Primarily through particle-to-particle collisions, they reduce the amount of magnetic foreign matter present after pulverization and produce a finer product. However, these mills are more expensive and require more auxiliary equipment.

[0003] Existing airflow mills primarily use Laval nozzles to accelerate compressed air to supersonic speeds before it enters the grinding zone. The pressure differential causes the material to fluidize. The accelerated material in the grinding zone collides and rubs against each other at the intersection of the nozzles, causing it to pulverize. The resulting fine material is carried by the rising airflow to the classifying wheel for classification. Fine material that reaches the required particle size is collected by a cyclone separator, while coarse material settles back into the grinding zone for further grinding.

[0004] However, the existing air flow mills have the following disadvantages: the materials are mainly crushed by colliding with each other under the action of high-speed airflow, but the strong gas flow on the inner wall will still cause the friction between the materials and the inner wall of the equipment to generate heat. The heat carried away by the compressed air is limited, and long-term operation will cause the temperature of the crushing chamber to rise; the friction between the classifying wheel and the material will generate a lot of heat, and the temperature of the normal temperature compressed air reaching the upper part of the crushing chamber is relatively high, and the cooling effect is poor, resulting in a reduced service life of the classifying wheel; secondly, when the crushed material is a heat-sensitive substance, such as asphalt, the negative electrode material of lithium batteries, contacts the heating parts of the equipment, which will cause its own properties to change. Utility Model Content

[0005] The purpose of the utility model is to provide an air flow pulverizer and a lithium battery negative electrode material asphalt pulverizing system with a cooling function, which are used to solve the above technical problems.

[0006] The technical solutions adopted in this utility model are as follows:

[0007] The air flow mill includes a crushing chamber, a feed pipe, a discharge pipe, a classifying wheel and a separation chamber. The separation chamber is installed at the upper end of the crushing chamber, the discharge pipe is provided on one side of the separation chamber, and the classifying wheel is provided inside the separation chamber. The crushing chamber includes an outer chamber and an inner chamber provided inside the outer chamber. The inner chamber is connected to the outer chamber. The outer wall of the outer chamber is provided with the feed pipe and the first air inlet pipe. The first air inlet pipe is used to introduce cold air into the inner part of the outer chamber.

[0008] Preferably, a temperature sensor is further included, and the temperature sensor is provided on the inner wall of the discharge pipe or at the discharge pipe.

[0009] Preferably, the crushing chamber includes an outer shell and an inner shell arranged inside the outer shell, the outer chamber is formed between the outer shell and the inner shell, the inner side of the inner shell is the inner chamber, the first air inlet pipe is arranged in the outer shell and communicated with the outer chamber, and the feed pipe passes through the outer shell and the inner shell and communicates with the inner chamber.

[0010] As a further preference, a plurality of second air inlets are provided on the side wall of the inner shell, and each of the second air inlets is connected to a nozzle, and the nozzle is provided in the inner chamber.

[0011] Preferably, a discharge pipe is provided at the bottom of the pulverizing chamber, and the discharge pipe is communicated with the inner chamber.

[0012] Preferably, a flange is further included, and the lower end of the separation chamber is connected to the upper end of the crushing chamber through the flange, and the separation chamber is communicated with the inner chamber.

[0013] Preferably, a driving member is further included, and the driving member is provided on the other side of the separation chamber, and the driving member drives the classifying wheel.

[0014] A lithium battery negative electrode material asphalt crushing system with a cooling function includes the above-mentioned airflow crusher, and also includes an air compressor, a freeze dryer and a heat exchanger. The air compressor is connected to the freeze dryer, the freeze dryer is connected to the heat exchanger, and the heat exchanger is connected to the first air inlet pipe of the airflow crusher.

[0015] As a further preference, it also includes an air storage tank, a first precision filter and a second precision filter. The air storage tank and the first precision filter are arranged between the air compressor and the freeze dryer, the air storage tank is connected to the air compressor and the first precision filter, the first precision filter is connected to the freeze dryer, and the second precision filter is arranged between the heat exchanger and the air flow pulverizer, the second precision filter is connected to the heat exchanger and the air flow pulverizer.

[0016] As a further preference, it further comprises a cyclone collector, a dust collector and an induced draft fan, wherein the cyclone collector is connected to the discharge pipe of the air flow mill, and the dust collector is connected to the cyclone collector and the induced draft fan.

[0017] The above technical solution has the following advantages or beneficial effects:

[0018] In the utility model, through the arrangement of the crushing chamber, the feed pipe, the discharge pipe, the grading wheel, the separation chamber and the heat exchanger, the equipment can be cooled, so that the temperature in the crushing chamber is maintained in a certain range, and the original characteristics of heat-sensitive materials are retained when they are crushed. The intake air temperature can be adjusted according to the temperature of the discharge pipe, so that the cold air has a large cooling capacity when it reaches the separation chamber, and the grading wheel can be cooled to extend the service life. By cooling the compressed air to form cold air, and cooling the equipment by the cold air, there is no need to equip an additional air source or water cooling device, thereby improving the utilization rate of the compressed air. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the air flow pulverizer in the utility model;

[0020] Figure 2 This is a schematic diagram of the lithium battery negative electrode material asphalt crushing system with cooling function in the utility model;

[0021] Figure 3 Schematic diagram of the distribution of nozzles in the inner chamber.

[0022] In the figure: 1. Crushing chamber; 101. Inner chamber; 102. Outer chamber; 103. Outer shell; 104. Inner shell; 2. Feed pipe; 3. Discharge pipe; 4. Classifying wheel; 5. Separation chamber; 6. First air inlet pipe; 7. Second air inlet; 8. Nozzle; 9. Discharge pipe; 10. Flange; 11. Drive element; 12. Air compressor; 13. Freeze dryer; 14. Heat exchanger; 15. Air storage tank; 16. First precision filter; 17. Second precision filter; 18. Cyclone collector; 19. Dust collector; 20. Induced draft fan; 21. Air flow crusher. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like are used to indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of this utility model and to simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0026] Figure 1 It is a structural diagram of the air flow pulverizer in the utility model; Figure 3 is a schematic diagram of the nozzle distribution in the inner chamber. Figure 1 and Figure 3As shown, a jet mill 21 is shown, comprising a grinding chamber 1, a feed pipe 2, a discharge pipe 3, a classifying wheel 4 and a separation chamber 5. The separation chamber 5 is installed at the upper end of the grinding chamber 1, and a discharge pipe 3 is provided on one side of the separation chamber 5. The classification wheel 4 is provided inside the separation chamber 5. The grinding chamber 1 comprises an outer chamber 102 and an inner chamber 101 provided inside the outer chamber 102. The inner chamber 101 and the outer chamber 102 are interconnected. The outer wall of the outer chamber 102 is provided with a feed pipe 2 and a first air inlet pipe 6. The first air inlet pipe 6 is used to introduce cold air into the inner part of the outer chamber 102. In this embodiment, the grinding chamber 1 and the separation chamber 5 are interconnected. The material enters the grinding chamber 1 and is crushed by the supersonic airflow. The crushed material can enter the separation chamber 5 under the action of the airflow, be separated, and then leave through the discharge pipe 3. Among them, the first air inlet pipe 6 is connected to the interior of the outer chamber 102, and the outer chamber 102 is connected to the inner chamber 101. The cold air enters the outer chamber 102 and fills the outer chamber 102, and then enters the inner chamber 101 to form a supersonic airflow to crush the material. At the same time, since the temperature of the cold air is relatively low, the outer chamber 102, the inner chamber 101 and the separation chamber 5 can be cooled, thereby cooling the equipment (crusher) and internal components, such as the grading wheel 4, to improve the service life of the equipment and internal components. At the same time, it can also ensure that the temperature of the crushing chamber 1 will not rise when the material collides or rubs with the inner chamber 101, and retain its original characteristics when crushing heat-sensitive materials. And by directly cooling the compressed air, it is possible to avoid the need for additional air sources or water cooling devices, thereby improving the utilization rate of compressed air.

[0027] Furthermore, as a preferred embodiment, a temperature sensor is further included, and a temperature sensor is provided on or at the inner wall of the discharge pipe 3. In this embodiment, the temperature sensor is preferably provided on the inner wall of the discharge pipe 3 to detect the temperature of the discharge pipe 3 so as to adjust the temperature inside the pulverizing chamber 1 and the separation chamber 5. During the operation of the pulverizer, the temperature at the discharge pipe 3 can be monitored in real time. When the pulverizer runs for a long time, the temperature of the discharge pipe 3 will rise. By adjusting the temperature of the compressed air through the heat exchanger 14, the temperature of the pulverizing chamber 1 and the separation chamber 5 can be maintained at a low temperature, thereby ensuring that the characteristics of the heat-sensitive material itself do not change.

[0028] Furthermore, as a preferred embodiment, the grinding chamber 1 includes an outer shell 103 and an inner shell 104 disposed inside the outer shell 103. An outer chamber 102 is formed between the outer shell 103 and the inner shell 104. The inner side of the inner shell 104 is an inner chamber 101. The first air inlet pipe 6 is disposed in the outer shell 103 and communicates with the outer chamber 102. The feed pipe 2 passes through the outer shell 103 and the inner shell 104 and communicates with the inner chamber 101. A gap is provided between the outer shell 103 and the inner shell 104 to form the outer chamber 102. A plurality of second air inlets 7 are provided on the side wall of the inner shell 104. Each second air inlet 7 is connected to a nozzle 8. The nozzle 8 is disposed in the inner chamber 101. Figure 3 As shown, the compressed air after cooling forms cold air, which can enter the outer chamber 102 through the first air inlet pipe 6, then enter the nozzle 8 through the second air inlet 7, and then be ejected by the nozzle 8 to form a supersonic airflow to crush the material. The crushed material enters the separation chamber 5 under the action of the rising airflow, and is screened by the classifying wheel 4. The qualified powder will pass through the gaps between the blades of the classifying wheel 4 and enter the discharge pipe 9, and finally be discharged. The unqualified powder will be screened out and fall to the bottom of the inner chamber 101, and be crushed again by the supersonic airflow. This process is repeated many times until all the materials that can be crushed are crushed and pass the screening of the classifying wheel 4, and are discharged from the discharge pipe 3. The coarse powder that cannot or cannot be crushed falls to the lower part of the inner chamber 101 and is discharged through the discharge pipe 9. Among them, the nozzle 8 is a Laval nozzle.

[0029] Furthermore, as a preferred embodiment, a discharge pipe 9 is provided at the bottom of the crushing chamber 1, and the discharge pipe 9 is connected to the inner chamber 101. A control valve is provided on the discharge pipe 9 for opening or closing the discharge pipe 9 to facilitate the discharge of materials that cannot be crushed.

[0030] Furthermore, as a preferred embodiment, a flange 10 is further included, through which the lower end of the separation chamber 5 is connected to the upper end of the crushing chamber 1, and the separation chamber 5 is communicated with the inner chamber 101. The flange 10 is fixedly provided at the lower end of the separation chamber 5, and the flange 10 and the upper end of the crushing chamber 1 can be connected by bolts, and the flange 10 is used to connect the separation chamber 5 to the crushing chamber 1.

[0031] Furthermore, as a preferred embodiment, a driving member 11 is further included. The driving member 11 is provided on the other side of the separation chamber 5, and the driving member 11 drives the classifying wheel 4. The driving member 11 is a motor, which is used to drive the classifying wheel 4 to rotate at a high speed to facilitate screening of the crushed material.

[0032] The above are only preferred embodiments of the present invention, and are not intended to limit the scope of protection and implementation of the present invention.

[0033] Figure 2This is a schematic diagram of the lithium battery negative electrode material asphalt crushing system with cooling function in the utility model; see Figure 2 As shown, the present invention, based on the above-mentioned embodiment, also includes a lithium battery negative electrode material asphalt crushing system with a cooling function, including an air flow mill 21, an air compressor 12, a freeze dryer 13 and a heat exchanger 14, the air compressor 12 is connected to the freeze dryer 13, the freeze dryer 13 is connected to the heat exchanger 14, and the heat exchanger 14 is connected to the first air inlet pipe 6 of the air flow mill 21. Among them, the compressor is used to provide compressed air, and the freeze dryer 13 is provided to perform preliminary cooling of the compressed air and separate the water vapor in the compressed air to obtain dry compressed air. The heat exchanger 14 is provided to cool the compressed air and control the temperature of the compressed air, thereby obtaining cold air within a certain temperature range.

[0034] Furthermore, as a preferred embodiment, it also includes an air storage tank 15, a first precision filter 16, and a second precision filter 17. The air storage tank 15 and the first precision filter 16 are provided between the air compressor 12 and the freeze dryer 13. The air storage tank 15 connects the air compressor 12 and the first precision filter 16. The first precision filter 16 is connected to the freeze dryer 13. A second precision filter 17 is provided between the heat exchanger 14 and the air flow mill 21. The second precision filter 17 connects the heat exchanger 14 and the air flow mill 21. The air storage tank 15 is used to store compressed air, and the first precision filter 16 and the second precision filter 17 are used to filter the compressed air and remove particulate impurities in the compressed air to facilitate obtaining clean compressed air.

[0035] Furthermore, as a preferred embodiment, the cyclone collector 18, the dust collector 19, and the induced draft fan 20 are further included. The cyclone collector 18 is connected to the discharge pipe 3 of the airflow pulverizer 21, and the dust collector 19 is connected to the cyclone collector 18 and the induced draft fan 20. The cyclone collector 18 is used to collect the qualified pulverized materials, and the induced draft fan 20 is used to provide negative pressure, which can draw the air entering the cyclone collector 18 into the dust collector 19 for dust removal and purification, and then discharge it to avoid air pollution.

[0036] In this embodiment, a PLC controller may also be included, which is used to connect to the air compressor 12, the freeze dryer 13, the heat exchanger 14, the induced draft fan 20, the drive 11 and the temperature sensor, and control the heat exchanger 14 according to the temperature detected by the temperature sensor, thereby controlling the temperature of the cold air.

[0037] In this embodiment, the freeze dryer 13, the heat exchanger 14, the cyclone collector 18, the dust collector 19 and the classifying wheel 4 are all common structures on the market, and their specific structures and principles will not be described in detail here.

[0038] When in use, the air compressor 12 is controlled to work and generate compressed air. The compressed air enters the air storage tank 15 for storage, and then passes through the first precision filter 16 for preliminary filtration, and then passes through the freeze dryer 13 for preliminary cooling and removal of moisture to obtain dry compressed air, and then passes through the heat exchanger 14 for cooling to obtain cold air in a specified temperature range, and then passes through the second precision filter 17 for filtration to obtain clean cold air, and the cold air then passes through the first air inlet pipe 6 into the outer chamber 102, and then enters the inner chamber 101 through the nozzle 8 to form a A supersonic airflow is formed, and material is added to the inner chamber 101 through the feed pipe 2. The material is crushed by the impact of the supersonic airflow and rises to the separation chamber 5 with the airflow. At the same time, the driving member 11 drives the classifying wheel 4 to rotate to screen the material. The qualified crushed material can enter the discharge pipe 3 and enter the cyclone collector 18 from the discharge pipe 3, and then accumulate inside the cyclone collector 18. The air entering the cyclone collector 18 will enter the dust collector 19 under the action of the induced draft fan 20 for dust removal, and then be discharged by the induced draft fan 20.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the implementation method and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. Airflow mill, characterized in that: It includes a crushing chamber, a feed pipe, a discharge pipe, a grading wheel and a separation chamber. The separation chamber is installed at the upper end of the crushing chamber, the discharge pipe is provided on one side of the separation chamber, and the grading wheel is provided inside the separation chamber. The crushing chamber includes an outer chamber and an inner chamber provided inside the outer chamber. The inner chamber is connected to the outer chamber. The outer wall of the outer chamber is provided with the feed pipe and the first air inlet pipe. The first air inlet pipe is used to introduce cold air into the inner part of the outer chamber.

2. The air flow mill according to claim 1, wherein It also includes a temperature sensor, which is arranged on the inner wall of the discharge pipe or at the discharge pipe.

3. The air flow mill according to claim 1, wherein: The crushing chamber includes an outer shell and an inner shell arranged inside the outer shell, the outer chamber is formed between the outer shell and the inner shell, the inner side of the inner shell is the inner chamber, the first air inlet pipe is arranged in the outer shell and communicates with the outer chamber, and the feed pipe passes through the outer shell and the inner shell and communicates with the inner chamber.

4. The air flow mill according to claim 3, wherein: A plurality of second air inlets are provided on the side wall of the inner shell, and each of the second air inlets is connected to a nozzle respectively, and the nozzle is provided in the inner chamber.

5. The air flow mill according to claim 1, wherein: A discharge pipe is provided at the bottom of the pulverizing chamber, and the discharge pipe is communicated with the inner chamber.

6. The air flow mill according to claim 1, wherein: It also includes a flange, the lower end of the separation chamber is connected to the upper end of the crushing chamber through the flange, and the separation chamber is communicated with the inner chamber.

7. The air flow mill according to claim 1, wherein The device further comprises a driving member, which is provided on the other side of the separation chamber and drives the classifying wheel.

8. A lithium battery negative electrode material asphalt crushing system with a cooling function, characterized in that: The air flow pulverizer comprises the air flow pulverizer according to any one of claims 1 to 7, and further comprises an air compressor, a freeze dryer and a heat exchanger, wherein the air compressor is connected to the freeze dryer, the freeze dryer is connected to the heat exchanger, and the heat exchanger is connected to the first air inlet pipe of the air flow pulverizer.

9. The lithium battery negative electrode material asphalt crushing system with cooling function according to claim 8, characterized in that: It also includes an air storage tank, a first precision filter and a second precision filter. The air storage tank and the first precision filter are arranged between the air compressor and the freeze dryer. The air storage tank is connected to the air compressor and the first precision filter. The first precision filter is connected to the freeze dryer. The second precision filter is arranged between the heat exchanger and the air flow pulverizer. The second precision filter is connected to the heat exchanger and the air flow pulverizer.

10. The lithium battery negative electrode material asphalt crushing system with cooling function according to claim 8, characterized in that: It also includes a cyclone collector, a dust collector and an induced draft fan. The cyclone collector is connected to the discharge pipe of the air flow pulverizer, and the dust collector is connected to the cyclone collector and the induced draft fan.

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