Airflow regulating device, lithium battery negative electrode powder airflow feeding system and feeding method

Abstract

The present application relates to the technical field of conveying, in particular to a gas flow adjusting device, a lithium battery negative electrode powder gas flow feeding system and a feeding method. The gas flow adjusting device is applied to the lithium battery negative electrode powder gas flow feeding system including a reaction kettle, and comprises a fan, a conveying pipeline and a gas flow adjusting block arranged in the conveying pipeline. One side of the conveying pipeline close to the fan is provided with a feeding opening. The fan is adapted to blow constant-pressure high-speed gas flow into the conveying pipeline, so as to blow the powder fed from the feeding opening into the reaction kettle through the material channel of the gas flow adjusting block. The gas flow adjusting block arranged in the conveying pipeline is used for channel selection adjustment of the discharging pipeline, and the inner wall of the discharging pipeline and the sliding filter screen are cleaned through the sliding of the gas flow adjusting block, so that the technical problems of blockage and uneven mixing of the traditional lithium battery negative electrode powder feeding system are solved.

Description

[0001] This application is a divisional application. The original application number is 202211478799.6, the application date is 2022.11.24, and the invention title is: Lithium Battery Anode Powder Airflow Feeding System and Feeding Method. Technical Field

[0002] This invention relates to the field of conveying technology, specifically to a pneumatic feeding system and method for lithium battery negative electrode powder. Background Technology

[0003] The manufacturing of lithium battery electrodes includes positive electrode materials and negative electrode materials. Both positive and negative electrode materials are in powder form. During the production process, the powder needs to be transported through pipelines to the reaction vessel for mixing. Currently, the powder is usually transported to the reaction vessel by a Roots blower.

[0004] However, this method still has the following problems: 1. The particle size of the powder cannot be controlled, and large particles of powder are often mixed in, resulting in poor subsequent mixing effect; 2. The powder needs to be filtered through a filter screen, and long-term operation will cause the filter screen to become clogged, which will lead to poor material conveying.

[0005] Therefore, there is an urgent need to provide a feeding system that can effectively solve the problems of poor material conveying and uneven mixing that occur during the traditional feeding process of lithium battery anode powder. Summary of the Invention

[0006] This invention provides a pneumatic feeding system and method for lithium battery anode powder to solve the technical problems of clogging and uneven mixing that are common in traditional lithium battery anode powder feeding systems.

[0007] In a first aspect, the present invention provides a lithium battery negative electrode powder pneumatic feeding system, comprising: a conveying device and a reaction vessel;

[0008] The conveying device is connected to the reaction vessel to deliver the powder into the reaction vessel;

[0009] The conveying device includes: a fan, a conveying pipe, and an airflow regulating block disposed in the conveying pipe; wherein

[0010] The conveying pipeline has a feeding port on the side closest to the blower;

[0011] The blower is adapted to blow a constant pressure high-speed airflow into the conveying pipeline so as to blow the powder fed from the feeding port into the reactor through the material channel opened on the airflow regulating block.

[0012] Secondly, the present invention provides a method for feeding lithium battery anode powder in an airflow layer, comprising: feeding the powder using the aforementioned lithium battery anode powder airflow feeding system.

[0013] The beneficial effects of this invention are that the lithium battery negative electrode powder pneumatic feeding system of this invention conveys the powder to the reactor through a set conveying device, and adjusts the outlet pipe channel by setting an airflow regulating block in the conveying pipe, and cleans the inner wall of the outlet pipe and the sliding filter screen by sliding the airflow regulating block, thereby solving the technical problems of clogging and uneven mixing that are common in traditional lithium battery negative electrode powder feeding systems.

[0014] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0015] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the lithium battery negative electrode powder airflow feeding system of the present invention;

[0018] Figure 2 This is a schematic diagram of the conveying device in the lithium battery negative electrode powder pneumatic feeding system of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the conveying device in the lithium battery negative electrode powder airflow feeding system of the present invention;

[0020] Figure 4 This is a schematic diagram of the airflow regulating block in the lithium battery negative electrode powder airflow feeding system of the present invention;

[0021] Figure 5 This is a schematic diagram of the internal structure of the airflow regulating block in the lithium battery negative electrode powder airflow feeding system of the present invention;

[0022] Figure 6 This is a schematic diagram showing the installation of the discharge pipe and sliding filter screen of the conveying device in the lithium battery negative electrode powder airflow feeding system of the present invention.

[0023] In the picture:

[0024] Conveying device 1, feeding port 10, fan 11, conveying pipe 12, main pipe 121, discharge pipe 122, baffle 1220, first sub-discharge pipe 1221, second sub-discharge pipe 1222, airflow gap 1223;

[0025] Reactor 2;

[0026] Airflow regulating block 3, material channel 30, discharge channel 31, miscellaneous material storage bin 32, screen hole 321, and flow channel 33;

[0027] 4. Sliding filter screen; 5. Drive screw. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figures 1 to 6 As shown, this embodiment provides a lithium battery negative electrode powder pneumatic feeding system, including: a conveying device 1 and a reactor 2; the conveying device 1 is connected to the reactor 2 to deliver the powder to the reactor 2; the conveying device 1 includes: a fan 11 and a conveying pipe 12 and an airflow regulating block 3 disposed in the conveying pipe 12; wherein the conveying pipe 12 has a feeding port 10 on the side near the fan 11; the fan 11 is adapted to blow a constant pressure high-speed airflow into the conveying pipe 12 to blow the powder fed from the feeding port 10 into the reactor 2 through the material channel 30 opened on the airflow regulating block 3.

[0030] In this embodiment, the powder is conveyed to the reactor 2 by the conveying device 1, and the outlet pipe 122 is selected and adjusted by the airflow regulating block 3 in the conveying pipe 12. The inner wall of the outlet pipe 122 and the sliding filter screen 4 are cleaned by the sliding of the airflow regulating block 3, thereby solving the technical problems of blockage and uneven mixing that are common in traditional lithium battery negative electrode powder feeding systems.

[0031] In this embodiment, the conveying pipe 12 includes: a main pipe 121 and a discharge pipe 122 vertically arranged on the main pipe 121; wherein one end of the main pipe 121 is connected to the air outlet of the blower 11, and the other end is sealed; the discharge end of the discharge pipe 122 is connected to the feed inlet of the reactor 2.

[0032] In this embodiment, the blower 11 is adapted to blow gas into the main pipe 121, thereby pushing the powder fed in through the feed port 10 through the material channel 30 opened on the airflow regulating block 3 and into the reaction vessel 2 through the discharge pipe 122.

[0033] In this embodiment, the airflow regulating block 3 is slidably disposed in the main pipe 121; and the top of the airflow regulating block 3 is provided with a discharge channel 31 corresponding to the discharge pipe 122; the discharge channel 31 is connected to the material channel 30; and a partition 1220 is provided inside the discharge pipe 122 to divide the discharge pipe 122 into a first sub-discharge pipe 1221 and a second sub-discharge pipe 1222 of equal width and not connected; the width of the discharge channel 31 is the same as the width of each of the sub-discharge pipes, so as to transport the powder to the reactor 2 through different sub-discharge pipes.

[0034] In this embodiment, the first sub-discharge pipe 1221 and the second sub-discharge pipe 1222 have the same width, so that they can be aligned with each other for discharging when the airflow regulating block 3 slides.

[0035] In this embodiment, a drive screw 5 is also provided inside the main pipe 121; one end of the drive screw 5 abuts against the airflow regulating block 3, and the other end abuts against the sealing end of the main pipe 121; and the drive screw 5 is adapted to drive the airflow regulating block 3 to slide inside the main pipe 121, so that the discharge channel 31 of the airflow regulating block 3 is sequentially connected to the first sub-discharge pipe 1221 and the second sub-discharge pipe 1222; wherein the drive motor in the drive screw 5 is adapted to control the sliding of the airflow regulating block 3 according to a preset feeding amount.

[0036] In this embodiment, the drive screw 5 is adapted to move the airflow regulating block 3 to achieve the switching between the first sub-discharge pipe 1221 and the second sub-discharge pipe 1222. Specifically, the sum of the preset discharge times of the first sub-discharge pipe 1221 and the second sub-discharge pipe 1222 is greater than the theoretical discharge time, that is, a redundant discharge design is adopted. When the discharge time of the first sub-discharge pipe 1221 is completed, the drive motor drives the airflow regulating block 3 to slide, thereby switching the discharge channel 31 of the airflow regulating block 3 to align with the second sub-discharge pipe 1222 for powder switching and conveying.

[0037] In this embodiment, since powder inevitably clumps due to temperature or humidity changes during the conveying process, if a traditional single-channel powder conveying method is used, the machine needs to be stopped to deal with the clumping and blockage, which affects production efficiency. The dual-channel redundant feeding design not only meets the feeding volume requirements, but also enables cleaning without stopping the machine.

[0038] In this embodiment, the airflow regulating block 3 is further provided with a miscellaneous material storage chamber 32; the distance between the inlet of the miscellaneous material storage chamber 32 and the discharge channel 31 is the same as the distance between the two sub-discharge pipes, so that after the airflow regulating block 3 moves, the large particles in the first sub-discharge pipe 1221 fall into the miscellaneous material storage chamber 32 through the inlet of the miscellaneous material storage chamber 32.

[0039] In this embodiment, the distance between the inlet of the waste material storage bin 32 and the material channel is the same as the distance between the two sub-discharge pipes. Thus, when the material channel switches from the first sub-discharge pipe 1221 to be aligned with the second sub-discharge pipe 1222, the first sub-discharge pipe 1221 is aligned with the waste material storage bin 32. At this time, the large particles of powder blocked by the sliding filter 4 in the first sub-discharge pipe 1221 will fall naturally into the waste material storage bin 32 due to the loss of airflow propulsion, thereby recycling and storing the large particles of waste material in the powder.

[0040] In this embodiment, each of the sub-discharge pipes is provided with a sliding filter screen 4; and each of the sliding filter screens 4 is adapted to move from the lower end to the upper end of the sub-discharge pipe under the action of airflow; and each of the sliding filter screens 4 is adapted to fall under its own weight after the discharge channel 31 switches positions, so as to scrape the powder adhering to the inner wall of the sub-discharge pipe to the miscellaneous material storage bin 32.

[0041] In this embodiment, the sliding filter 4 is adapted to slide within the sub-discharge pipe. Specifically, before the equipment is turned on, the sliding filter 4 is located at the lower end of the sub-discharge pipe. After the equipment is turned on, the gas blown in by the blower 11 pushes the frame of the sliding filter 4 to rise to the upper end of the sub-discharge pipe, and then begins to filter and feed the powder. When the discharge channel 31 switches positions, the sliding filter 4 loses the airflow thrust and will fall due to its own weight. During the falling process, it scrapes off any powder that may be adhering to the inner wall of the sub-discharge pipe, allowing this part of the powder to enter the waste storage bin 32 together, thereby achieving the cleaning of the pipe.

[0042] In this embodiment, the bottom of the miscellaneous material storage bin 32 is uniformly provided with a plurality of sieve holes 321; wherein the sieve holes 321 are adapted to filter out large particles of powder and allow the qualified powder scraped off by the sliding filter screen 4 to fall back into the main material pipe.

[0043] In this embodiment, the sieve holes 321 at the bottom of the miscellaneous material storage bin 32 allow powder that meets the particle size requirements to fall back into the main pipe 121, avoiding waste of powder and ensuring the accuracy of powder conveying. It also blocks powder that does not meet the particle size requirements, preventing secondary blockage or uneven mixing caused by this powder entering the reactor 2.

[0044] In this embodiment, the airflow regulating block 3 is further provided with a flow channel 33, and each of the sub-discharge pipes is provided with an airflow baffle 1220; the sliding filter 4 is adapted to slide vertically along the surface of the airflow baffle 1220; and an airflow gap 1223 is left between the airflow baffle 1220 and the sub-discharge pipe; wherein the flow channel 33 is connected to the sealing space at the rear end of the airflow regulating block 3 and the airflow gap 1223 respectively; the flow channel 33 is adapted to blow the compressed gas when the airflow regulating block 3 moves backward through the airflow gap 1223 to the upper surface of the sliding filter 4, so as to blow down the powder blocked in the filter holes of the sliding filter 4.

[0045] In this embodiment, when the airflow regulating block 3 moves, the space behind it is compressed, thereby increasing the pressure in this part of the space. This forces the gas in this part of the space to enter the airflow gap 1223 through the guide channel 33. Furthermore, since the height of the airflow baffle 1220 is less than the height of the side wall of the sub-discharge pipe, the airflow entering the airflow gap 1223 will pass through the sliding filter 4 from top to bottom, thereby blowing down the powder that may be blocked in the filter holes, thus ensuring the smooth flow of the filter during the next feeding. Moreover, since the opening position of the guide channel 33 corresponds to the position of the miscellaneous material storage bin, that is, when the airflow regulating block slides to the corresponding first sub-discharge pipe 1221, the airflow gap 1223 is connected. This means that only the backflow airflow blows towards the sliding filter 4 in the first sub-discharge pipe 1221, without affecting the normal conveying of the second sub-discharge pipe 1222.

[0046] In this embodiment, the drive screw 5 is adapted to drive the airflow regulating block 3 to slide back and forth after the feeding is completed, so as to generate airflow fluctuations at the sliding filter screen 4, thereby clearing the blocked filter holes on the sliding filter screen 4.

[0047] In this embodiment, after the feeding is completed, the reactor 2 is closed and the blower 11 stops working. At this time, the feeding device is approximately a sealed space. During the process of the drive screw 5 moving the airflow regulating block 3, the gas in the space behind the airflow regulating block 3 repeatedly blows and sucks the sliding filter screen 4 through the gas gap, thereby further clearing the filter holes of the sliding filter screen 4. In addition, the gas blows and sucks the powder in the miscellaneous material storage bin 32, thereby sieving the powder in the miscellaneous material storage bin 32 and sending the powder that meets the particle size requirements back to the main pipeline 121.

[0048] Secondly, the present invention also provides a method for feeding lithium battery anode powder in an airflow layer, comprising: using the above-mentioned lithium battery anode powder airflow feeding system.

[0049] In summary, the lithium battery anode powder pneumatic feeding system of the present invention conveys the powder to the reactor 2 through the conveying device 1, and adjusts the outlet pipe 122 by means of the airflow regulating block 3 in the conveying pipe 12, and cleans the inner wall of the outlet pipe 122 and the sliding filter screen 4 by means of the sliding of the airflow regulating block 3, thereby solving the technical problems of clogging and uneven mixing that are common in traditional lithium battery anode powder feeding systems.

[0050] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An airflow regulating device, characterized in that, Applications include pneumatic feeding systems for lithium battery negative electrode powder, including reaction vessels; The airflow regulating device includes: a fan, a conveying pipe, and an airflow regulating block disposed in the conveying pipe; wherein The conveying pipeline has a feeding port on the side closest to the blower; The blower is adapted to blow a constant-pressure, high-speed airflow into the conveying pipeline, so that the powder fed from the feeding port passes through the airflow regulating block. The material is blown into the reactor through the established channel; The conveying pipeline includes: a main pipeline and a discharge pipeline vertically arranged on the main pipeline; wherein One end of the main pipe is connected to the air outlet of the fan, and the other end is sealed. The discharge end of the discharge pipe is connected to the inlet of the reactor; The airflow regulating block is slidably disposed in the main duct; and The top of the airflow regulating block is provided with a discharge channel corresponding to the discharge pipe; The discharge channel is connected to the material channel; and The discharge pipe is equipped with a baffle to divide the discharge pipe into a first sub-discharge pipe and a second sub-discharge pipe of equal width and not connected. The width of the discharge channel is the same as the width of each of the sub-discharge pipes, so as to transport the powder to the reactor through different sub-discharge pipes; Each of the aforementioned sub-discharge pipes is equipped with a sliding filter screen; and Each of the aforementioned sliding filter screens is adapted to move from the lower end to the upper end of its respective sub-discharge pipe under the action of airflow; and Each of the sliding filter screens is adapted to fall under its own weight after the discharge channel switches positions, so as to scrape away the powder adhering to the inner wall of the sub-discharge pipe where it is located. Transfer to the miscellaneous materials storage bin.

2. The airflow regulating device as described in claim 1, characterized in that, The main pipe is also equipped with a drive screw; One end of the drive screw abuts against the airflow regulating block, and the other end abuts against the sealing end of the main pipe; and The drive screw is adapted to drive the airflow regulating block to slide within the main pipe, so that the outlet channel of the airflow regulating block is sequentially connected to the first... The first discharge pipe and the second discharge pipe are connected; among them The drive motor in the drive screw is adapted to control the sliding of the airflow regulating block according to the preset feeding amount.

3. The airflow regulating device as described in claim 2, characterized in that, The airflow regulating block also has a miscellaneous material storage compartment. The distance between the inlet of the miscellaneous material storage bin and the material channel is the same as the distance between the two sub-discharge pipes, so as to allow movement of the airflow regulating block. Then, large particles in the first discharge pipe fall into the miscellaneous material storage bin through the inlet of the miscellaneous material storage bin.

4. The airflow regulating device as described in claim 3, characterized in that, The bottom of the miscellaneous material storage bin is evenly provided with several sieve holes; wherein The sieve openings are suitable for filtering out large particles of powder and allowing the qualified powder scraped off by the sliding filter screen to fall back into the main feed pipe.

5. The airflow regulating device as described in claim 4, characterized in that, The airflow regulating block is also provided with a flow channel, and each of the sub-discharge pipes is provided with an airflow baffle. The sliding filter screen is adapted to slide vertically along the surface of the airflow baffle; and An airflow gap is left between the airflow baffle and the sub-discharge pipe; wherein The drainage channel is connected to the sealed space at the rear end of the airflow regulating block and the airflow gap, respectively; The flow channel is adapted to guide the compressed gas generated when the airflow regulating block moves backward, through the airflow gap, to the upper surface of the sliding filter screen, so as to... The powder that is clogging the filter holes of the sliding filter screen is blown off; The drive screw is adapted to drive the airflow regulating block to slide back and forth after feeding is completed, so as to generate airflow fluctuations at the sliding filter screen, thereby Unblock the filter holes on the sliding filter screen.

6. A pneumatic feeding system for lithium battery negative electrode powder, characterized in that, include: The reaction vessel and the airflow regulating device as described in claim 1.

7. A method for operating the lithium battery negative electrode powder pneumatic feeding system as described in claim 6, characterized in that, include: The powder is fed into the reaction vessel via a conveying device; The conveying device includes: a fan, a conveying pipe, and an airflow regulating block disposed in the conveying pipe; in The conveying pipeline has a feeding port on the side closest to the blower; The blower is adapted to blow a constant-pressure, high-speed airflow into the conveying pipeline, so that the powder fed from the feeding port passes through the airflow regulating block. The material is blown into the reactor through the established channel.

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