Powder material grading system

Abstract

The embodiment of the utility model provides a powder material grading system. The powder material grading system comprises an air injection system, a material feeding system, a boiling chamber, a target collecting bin, a fine powder collecting bin and a fan, a feeding hole is formed in the upper part of the boiling chamber, and the feeding end of the material feeding system is arranged at the feeding hole; the air injection system comprises a first air nozzle with a flat opening and a plurality of second air nozzles, and the first air nozzle is arranged on the side wall on the same side as the feeding opening; the bottom wall of the boiling chamber is provided with an air nozzle distribution area close to the first air nozzle, each second air nozzle is arranged in the air nozzle distribution area, and the air spraying direction of each second air nozzle inclines towards the direction far away from the first air nozzle; a target material outlet is formed in the bottom wall of the boiling chamber and is communicated with the target collecting bin; a fine powder outlet is formed in the top of the boiling chamber and is communicated with the fine powder collecting bin through a fine powder collecting pipeline. The device can realize grading of powder materials and can realize removal of metal foreign matters in positive electrode materials.

Description

Technical Field

[0001] The utility model relates to the field of material classification devices, and more specifically, to a powder material classification system. Background Art

[0002] In the field of power batteries, impurities in the cathode material, such as metal particles, large particles, non-metallic foreign objects, etc., seriously endanger the health of the battery. Currently, the main ways to remove impurities in the cathode material are as follows: 1. Using a permanent magnet or an electromagnetic separator, relying on the magnetism of the impurities themselves, adsorbing them onto the magnetic rod or the electromagnetic core to achieve the purpose of removing magnetic foreign objects. However, for non-magnetic substances such as copper and zinc, it is still impossible to solve the problem; 2. Using an ultrasonic vibrating screen, using a finer screen to screen the material to remove abnormal particles such as non-metallic foreign objects or larger metal foreign objects, but it is impossible to remove smaller foreign objects.

[0003] Based on this, the present utility model is specifically proposed. Content of the Utility Model

[0004] The purpose of the present utility model is to provide a powder material classification system, aiming to provide a device that can achieve powder material classification and removal of metal impurities in the cathode material.

[0005] The embodiments of the present utility model are implemented as follows:

[0006] In a first aspect, the present utility model provides a powder material classification system, including a jet system, a material feeding system, a boiling chamber, a target collection bin, a fine powder collection bin, and a fan;

[0007] An upper side wall of the boiling chamber is provided with a feeding port, and a feeding end of the material feeding system is arranged at the feeding port;

[0008] The jet system includes a flat first jet nozzle and a plurality of second jet nozzles. The first jet nozzle is arranged on the side wall on the same side as the feeding port and below the feeding port. The jet direction of the first jet nozzle forms an angle of 0 to 30° with the horizontal plane;

[0009] The bottom wall of the boiling chamber has a jet nozzle distribution area close to the first jet nozzle. Each second jet nozzle is arranged in the jet nozzle distribution area, and the jet direction of each second jet nozzle is inclined away from the first jet nozzle and forms an angle of 5 to 60° with the vertical direction;

[0010] The bottom wall of the boiling chamber is provided with a target material outlet, and the target material outlet is communicated with the target collection bin;

[0011] A fine powder outlet is arranged at the top of the boiling chamber. The fine powder outlet is communicated with the fine powder collection bin through a fine powder collection pipeline, and a fan is arranged on the fine powder collection pipeline.

[0012] In an alternative embodiment, the target object outlet is located in a region of the bottom wall of the boiling chamber away from the first jet nozzle;

[0013] A large particle outlet is provided on the bottom wall, and the large particle outlet is located in the jet nozzle distribution area;

[0014] Each large particle outlet is connected to a large particle collection bin, or all the large particle outlets are connected to the same large particle collection bin.

[0015] In an alternative embodiment, there are multiple large particle outlets, and one large particle outlet is provided between every two adjacent second jet nozzles.

[0016] In an alternative embodiment, at least one baffle is further provided at the bottom of the boiling chamber, each baffle is provided in the area where multiple second jet nozzles are located, and each baffle is arranged parallel to the width direction of the boiling chamber.

[0017] In an alternative embodiment, the first jet nozzle is parallel to the width direction of the side wall of the boiling chamber where it is located;

[0018] And / or, the second jet nozzle is parallel to the width direction of the bottom wall of the boiling chamber where it is located.

[0019] In an alternative embodiment, an exhaust port is provided at the top of the fine powder collection bin, and a breathable backflush filter element is provided at the exhaust port.

[0020] In an alternative embodiment, the powder material classification system further includes a buffer tank for temporarily storing compressed gas, and the buffer tank is connected to the first jet nozzle and the second jet nozzle.

[0021] In an alternative embodiment, the powder material classification system further includes a dehumidifier and a compressor;

[0022] The exhaust port is sequentially connected to the compressor, the dehumidifier, and the inlet of the buffer tank through an exhaust pipe.

[0023] In an alternative embodiment, a plurality of first guide plates consistent with the jet direction are uniformly arranged in the first jet nozzle.

[0024] In an alternative embodiment, a plurality of second guide plates consistent with the jet direction are uniformly arranged in each second jet nozzle.

[0025] The beneficial effects of the embodiments of the present utility model are:

[0026] The powder material classification system provided by the present utility model conveys powder materials into the boiling chamber from above the boiling chamber through a material feeding system. The first jet nozzle arranged on the side wall provides an initial velocity in an approximately horizontal direction for the powder materials entering the boiling chamber. Under the jet action of the second jet nozzle, the powder materials entering the boiling chamber are in a boiling state in the boiling chamber. Small-density particles are discharged into the fine powder collection bin through the fine powder outlet under the action of the fan and are collected, while the target particles with slightly larger density fall and are collected into the target collection bin through the target material outlet. The powder material classification system provided by the embodiments of the present utility model can achieve the classification of powder materials. And due to the different densities of metal foreign matters and the cathode material, the removal of metal foreign matters in the cathode material can also be achieved through this device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a schematic structural diagram of the powder material classification system provided by the embodiments of the present utility model;

[0029] Figure 2 When viewed from above, it is a schematic diagram of some internal structures of the boiling chamber.

[0030] Reference numerals: 100 - powder material classification system; 110 - buffer tank; 121 - first jet nozzle; 122 - second jet nozzle; 123 - first deflector; 124 - second deflector; 130 - material feeding system; 131 - buffer storage bin; 140 - boiling chamber; 141 - large particle outlet; 142 - target material outlet; 143 - fine powder outlet; 144 - baffle; 150 - target collection bin; 160 - fine powder collection bin; 161 - breathable backflush filter element; 170 - fan; 180 - large particle collection bin; 191 - compressor; 192 - dehumidifier; 193 - exhaust pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0033] It should be noted that: like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0035] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0036] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0037] To solve the above problems, a powder material boiling classification system is proposed: the true density of non-metallic foreign matters is basically less than 3 g / cm 3 , and most of the metallic foreign matters are debris such as stainless steel, iron, copper, etc. generated by equipment wear, and their true density is generally greater than 7 g / cm 3 ; and the true density of the cathode material is affected by factors such as crystal structure and particle size, and is generally in the range of 4 - 6 g / cm 3Between them, based on this, the system utilizes the different true densities of the particles. During the continuous perturbation of the material by air with a certain flow rate, materials with different densities will separate. Materials with a greater density will fall earlier, while materials with too small a density will be carried by the air flow to another device.

[0038] As Figure 1 shown, an embodiment of the present utility model provides a powder material classification system 100, including a jet system, a material feeding system 130, a boiling chamber 140, a target collection bin 150, a fine powder collection bin 160, and a fan 170;

[0039] The upper side wall of the boiling chamber 140 is provided with a feeding port, and the feeding end of the material feeding system 130 is arranged at the feeding port;

[0040] The jet system includes a flat-mouthed first jet nozzle 121 and a plurality of second jet nozzles 122. The first jet nozzle 121 is arranged on the side wall on the same side as the feeding port and is located below the feeding port. The jet direction of the first jet nozzle 121 forms an angle of 0 to 30° with the horizontal plane;

[0041] The bottom wall of the boiling chamber 140 has a jet nozzle distribution area close to the first jet nozzle 121. Each second jet nozzle 122 is arranged in the jet nozzle distribution area. The jet direction of each second jet nozzle 122 is inclined away from the first jet nozzle 121 and forms an angle of 5 to 60° with the vertical direction;

[0042] The bottom wall of the boiling chamber 140 is provided with a target material outlet 142, and the target material outlet 142 is communicated with the target collection bin 150;

[0043] The top of the boiling chamber 140 is provided with a fine powder outlet 143. The fine powder outlet 143 is communicated with the fine powder collection bin 160 through a fine powder collection pipeline, and a fan 170 is arranged on the fine powder collection pipeline.

[0044] The powder material classification system 100 provided by the embodiment of the present utility model conveys powder materials into the boiling chamber 140 from above the boiling chamber 140 through the material feeding system 130. The first jet nozzle 121 arranged on the side wall provides an initial velocity close to the horizontal direction for the powder materials entering the boiling chamber 140. Under the jet action of the second jet nozzles 122, the powder materials entering the boiling chamber 140 are in a boiling state in the boiling chamber 140. Small-density particles rise and are discharged into the fine powder collection bin 160 through the fine powder outlet 143 under the action of the fan 170 and are collected, while target particles with a slightly greater density fall and are collected into the target collection bin 150 through the target material outlet 142. The powder material classification system 100 provided by the embodiment of the present utility model can achieve the classification of powder materials.

[0045] The true density of non-metallic foreign objects is basically less than 3 g / cm3 , most of the metallic foreign objects are debris such as stainless steel, iron, copper, etc. generated by equipment wear, and their true density is generally greater than 7 g / cm 3 ; while the true density of the cathode material is affected by factors such as crystal structure and particle size, and is generally between 4 and 6 g / cm 3 . Based on this, the powder material classification system 100 provided by the embodiments of the present invention can utilize the different true densities of the particles. During the continuous disturbance of the material by air with a certain flow rate, materials with different densities will be separated. Materials with a large density will fall earlier, and materials with too small density will be carried by the air flow into the fine powder collection bin 160. Therefore, the powder material classification system 100 provided by the present invention can achieve the removal of metallic foreign objects in the cathode material.

[0046] Optionally, the target object outlet is located in the area of the bottom wall of the boiling chamber 140 far from the first jet nozzle 121; a large particle outlet 141 is provided on the bottom wall, and the large particle outlet 141 is located in the jet nozzle distribution area; each large particle outlet 141 is connected to a large particle collection bin 180, or all the large particle outlets 141 are connected to the same large particle collection bin 180.

[0047] Under the action of the second jet nozzle 122 and the first jet nozzle 121, the particles with the largest density will not move to the position of the target material outlet 142 after entering. Under the action of gravity, they will fall into the large particle outlet 141 after moving a short distance just after entering, and are discharged into the large particle collection bin 180 through the large particle outlet 141. Particles with medium density will not float up and will settle down after moving to the farthest position from the first jet nozzle 121 and are collected by the target collection bin 150. The specific settings of the large particle collection bin 180 and the large particle outlet 141 can achieve the classification of the powder material into at least 3 levels. When all the large particle outlets 141 are connected to the same large particle collection bin 180, the powder material can be classified into 3 levels. When each large particle outlet 141 is connected to a large particle collection bin 180, the powder material can be classified into more than 3 levels.

[0048] Optionally, there are multiple large particle outlets 141, and one large particle outlet 141 is provided between every two adjacent second jet nozzles 122.

[0049] Optionally, a plurality of first guide plates 123 consistent with the jet direction are provided inside the first jet nozzle 121.

[0050] Optionally, a plurality of second guide plates 124 consistent with the jet direction are provided inside each second jet nozzle 122.

[0051] Due to the frictional effect, the air flow velocity near the side wall of the air jet nozzle is relatively low. In order to avoid obvious poor jetting and classification effects caused by the relatively low air flow velocity at both ends of the air jet nozzle, a flow deflector is arranged inside the air jet nozzle. With the arrangement of multiple flow deflectors, the flow deflector has a decelerating effect on the approaching gas, so that the uniformity of the gas entering the boiling chamber 140 can be better ensured, thereby ensuring a better classification effect.

[0052] Optionally, the air jet system includes an air jet main pipe and multiple air jet branch pipes. The air jet branch pipes are connected to the air jet main pipe, and each air jet branch pipe is connected to the air jet main pipe. The first air jet nozzle 121 and each second air jet nozzle 122 are correspondingly connected to an air jet branch pipe. A pressure regulating valve is arranged on the air jet branch pipe, and air speed meters are arranged inside the first air jet nozzle 121 and the second air jet nozzle 122. The pressure regulating valve and the air speed meters can be communicatively connected, and the opening degree of the pressure regulating valve is automatically regulated according to the air speed information fed back by the air speed meters to achieve automatic control.

[0053] Optionally, the material feeding system 130 is connected to the bottom of the buffer bin 131, and the material feeding system 130 slowly and evenly conveys the material at the bottom of the buffer bin 131 into the boiling chamber 140.

[0054] The feeding method of the material feeding system 130 can specifically be belt feeding or screw feeding, and the specific feeding method to be used can be determined according to the physical properties of the material.

[0055] Optionally, at least one baffle 144 is further arranged at the bottom of the boiling chamber 140, and each baffle 144 is arranged in the area where multiple second air jet nozzles 122 are located, and each baffle 144 is arranged parallel to the width direction of the boiling chamber 140.

[0056] The baffle 144 can block the left - right movement of the particles. The higher the baffle 144, the fewer and smaller - sized particles enter the target collection bin 150. Therefore, whether to set the baffle 144 or the height of the baffle 144 can be selected according to the specific classification requirements.

[0057] Optionally, the first air jet nozzle 121 is parallel to the width direction of the side wall of the boiling chamber 140 where it is located. In this way, uniform air intake can be achieved from the side wall direction of the boiling chamber 140.

[0058] Optionally, the second air jet nozzle 122 is parallel to the width direction of the bottom wall of the boiling chamber where it is located. In this way, uniform air intake can be achieved from the bottom wall direction of the boiling chamber 140.

[0059] Optionally, an exhaust port is arranged at the top of the fine powder collection bin 160, and a breathable back - blowing filter element 161 is arranged at the exhaust port.

[0060] The facility of the breathable backflush filter element 161 can intercept the fine powder in the fine powder collection bin 160, and the carrier gas of the fine powder is discharged from the fine powder collection bin 160 through the breathable backflush filter element 161. It should be noted that the breathable backflush filter element 161 is essentially a filter element, which belongs to the prior art, so its structure will not be described in detail. Conventional dust collectors can also achieve the same function, so it can also be replaced with a conventional dust collector.

[0061] Optionally, the powder material classification system 100 further includes a buffer tank 110 for temporarily storing compressed gas. The buffer tank 110 is connected to the first jet nozzle 121 and the second jet nozzle 122.

[0062] The buffer tank 110 is provided, and the high-pressure gas passes through the buffer tank 110 and then enters the boiling chamber 140 through the nozzle to improve the stability of the device.

[0063] Optionally, the powder material classification system 100 further includes a dehumidifier 192 and a compressor 191. The exhaust port is sequentially connected to the compressor 191, the dehumidifier 192, and the inlet of the buffer tank 110 through a exhaust pipe 193.

[0064] The carrier gas discharged through the breathable backflush filter element 161 is compressed, then dehumidified by the dehumidifier 192, and then enters the buffer tank 110, and the carrier gas forms a closed-loop recycling.

[0065] Optionally, a carbon dioxide removal device can also be provided between the exhaust port and the compressor 191 to remove the carbon dioxide therein, and then compress and dehumidify before recycling.

[0066] Specifically, taking Figure 1 and Figure 2 the shown structure as an example, the following description is made:

[0067] The material to be processed needs to be moisture-proof, so the gas is first dehumidified and then sent into the buffer tank 110. To save resources, a closed-loop carrier gas method is adopted.

[0068] The crystal structure and size of the material to be processed are relatively concentrated, so 6 second jet nozzles 122 and 1 first jet nozzle 121 are provided. The included angle between the first jet nozzle 121 and the horizontal direction is 0°, and the included angle between the second jet nozzle 122 and the vertical direction is 29°. 4 flow guiding plates are provided inside each jet nozzle. The simulation calculation results show that the carrier gas distribution at the outlet of the jet nozzle is uniform. The simulation calculation results in the boiling chamber 140 show that it conforms to the expected distribution method.

[0069] The feeding system adopts a conical bottom bin, and a fluidizing gas butterfly and a turbine are added at the bottom to assist in discharging materials; based on the material characteristics, the feeding method of the material feeding system 130 adopts a series connection of screw feeding + electromagnetic oscillation feeding, that is, after the screw feeding discharges, it enters the electromagnetic oscillation feeding, and then the material enters the boiling chamber 140 accordingly.

[0070] Based on the material characteristics, the target collection bin 150 uses a flat-bottom bin; each large particle outlet 141 is connected to the large particle collection bin 180 through a ramp channel with an angle of 50° with the horizontal plane. In order to distinguish the classification effect, one large particle outlet 141 is connected to one large particle collection bin 180 without mixing.

[0071] Based on the material characteristics, the separation fan 170 uses an axial flow fan 170 with an external motor. And a breathable back-blow filter element 161 is provided at the top of the fine powder collection bin 160. The carrier gas after filtration returns to the gas system and is put back into use after being dehumidified again.

[0072] It should be noted that in other embodiments of the present invention, the specific setting quantity can be freely set according to specific usage requirements. The quantity shown in the figure is only one implementation manner of the present invention. The specific setting quantity of the deflector can be set after simulation calculation according to specific usage requirements. The quantity shown in the figure is only one implementation manner of the present invention.

[0073] In summary, the powder material classification system provided by the present invention utilizes the different true densities of the powder materials themselves, and their movement effects under the same wind disturbance are different. Materials with larger density or abnormal morphology are collected at the front end, and materials with too small particle size or foreign objects with smaller true density are sucked into the fine powder collection bin for collection.

[0074] After applying this powder material classification system to the treatment of the cathode material, for the target material after treatment, the detected number of metal particles is less than that of the materials treated by the permanent magnet iron remover and the electromagnetic iron remover, and the particle size distribution is better than that of the materials treated by the vibrating screen. The power consumption during the treatment process is small, and the risk of foreign objects generated by the equipment body is less than that of the vibrating screen.

[0075] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A powder material classification system, characterized in that: It includes an air injection system, a material feeding system, a boiling chamber, a target collection bin, a fine powder collection bin and a fan; The upper side wall of the boiling chamber is provided with a feed port, and the feeding end of the material feeding system is provided at the feed port; The air injection system includes a first air nozzle with a flat mouth and a plurality of second air nozzles, wherein the first air nozzle is arranged on the side wall on the same side as the feed port and is located below the feed port, and the angle between the air injection direction of the first air nozzle and the horizontal plane is 0 to 30 degrees; The bottom wall of the boiling chamber has an air nozzle distribution area close to the first air nozzle, and each of the second air nozzles is arranged in the air nozzle distribution area. The air jet direction of each second air nozzle is inclined away from the first air nozzle, and the angle with the vertical direction is 5 to 60 degrees; The bottom wall of the boiling chamber is provided with a target material outlet, and the target material outlet is communicated with the target collecting bin; A fine powder outlet is provided at the top of the boiling chamber. The fine powder outlet is connected to the fine powder collecting bin through a fine powder collecting pipe. The fan is provided on the fine powder collecting pipe.

2. The powder material classification system according to claim 1, characterized in that: The target object outlet is located on the bottom wall of the boiling chamber in an area away from the first air nozzle; The bottom wall is provided with a large particle outlet, and the large particle outlet is located in the air nozzle distribution area; Each of the large particle outlets is communicated with a large particle collection bin, or all of the large particle outlets are communicated with the same large particle collection bin.

3. The powder material classification system according to claim 2, characterized in that: There are multiple large particle outlets, and one large particle outlet is provided between every two adjacent second air nozzles.

4. The powder material classification system according to claim 1, characterized in that: At least one baffle is further provided at the bottom of the boiling chamber, each of the baffles is provided in the area where the plurality of second air nozzles are located, and each of the baffles is provided parallel to the width direction of the boiling chamber.

5. The powder material classification system according to claim 1, characterized in that: The first air nozzle is parallel to the width direction of the side wall of the boiling chamber; And / or, the second air nozzle is parallel to the width direction of the bottom wall of the boiling chamber where it is located.

6. The powder material classification system according to claim 1, characterized in that: An exhaust port is provided on the top of the fine powder collecting bin, and an air-permeable back-flushing filter element is provided at the exhaust port.

7. The powder material classification system according to claim 6, characterized in that: The powder material classification system further includes a buffer tank for temporarily storing compressed gas, and the buffer tank is communicated with the first air nozzle and the second air nozzle.

8. The powder material classification system according to claim 7, characterized in that: The powder material classification system also includes a dehumidifier and a compressor; The exhaust port is connected to the compressor, the dehumidifier and the air inlet of the buffer tank in sequence through an exhaust pipe.

9. The powder material classification system according to claim 1, characterized in that: A plurality of first guide plates are evenly arranged in the first air nozzle in the same direction as the air jet direction.

10. The powder material classification system according to claim 1, characterized in that: A plurality of second guide plates which are consistent with the air injection direction are evenly arranged in each of the second air injection nozzles.

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