Powder feeding, stirring and drying system

Abstract

The utility model discloses a powder feeding, stirring and drying system, which relates to the technical field of solid electrolyte production, and is provided with a drying module and a feeding module, when the system works, a vacuum assembly enables a feeding tank to generate a negative pressure suction effect, and the feeding tank pumps powder from a powder feeding tank through a pipeline; after entering the feeding tank, powder can be fed from the feeding port formed in the bottom of the feeding tank, the powder moves in the pipeline, the chance that the powder makes contact with the outside can be reduced, and the probability that wet steam in air is absorbed is reduced. According to the specific embodiment, the drying module is arranged, the powder is fed into the single-cone dryer of the drying module from the feeding tank, and the powder is stirred by the stirring paddle in the single-cone dryer, so that the powder is in uniform contact with the side wall of the single-cone dryer, the side wall of the single-cone dryer is heated, and the powder in the single-cone dryer is heated; wet steam generated after heating can be discharged from the single-cone dryer to the vacuum buffer tank; and the water content of the powder is effectively reduced, so that the quality of the subsequently produced solid electrolyte is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of solid electrolyte production, and further relates to a powder feeding, stirring and drying system. Background Art

[0002] The powder raw materials needed in the production process of solid electrolytes have a moisture content of 50ppm under production conditions, and the purchased powder raw materials are produced and packaged at room temperature, and the powder is a hygroscopic material. Even if the moisture content of the powder can be controlled within 50ppm during the production process, the packaging, transportation, unpacking and testing of incoming powder materials, and powder feeding (entering the front-end process of the production line) are all carried out at room temperature. After the powder is exposed to the air, it is difficult to ensure that the moisture content meets the standard. The moisture content of the incoming material detection powder reaches 800-1000ppm, which cannot meet the moisture content requirements of the production process.

[0003] For those skilled in the art, how to reduce the moisture content of powder feed is a technical problem that needs to be solved at present. Utility Model Content

[0004] The utility model provides a powder feeding, stirring and drying system, which utilizes vacuum feeding to dry the powder and reduce the moisture content. The specific scheme is as follows:

[0005] A powder feeding, stirring and drying system, comprising a drying module and a feeding module;

[0006] The feeding module includes a vacuum component and a feeding tank. The vacuum component is connected to the feeding tank through a pipeline to generate negative pressure in the feeding tank. The feeding tank is connected to a powder feeding tank through a pipeline, and powder is sucked from the powder feeding tank by using negative pressure. The powder entering the feeding tank from the powder feeding tank is fed to the drying module through a feeding port provided at the bottom of the feeding tank. The drying module is used to heat and dry the powder.

[0007] Optionally, a filter bag is arranged in the feed tank, the pipeline connection point of the vacuum assembly is located above the filter bag, and the pipeline connection point of the powder tank is located below the filter bag.

[0008] Optionally, the feed tank is connected to a nitrogen backflush tank, and the nitrogen backflush tank is used to blow air toward the upper surface of the filter bag.

[0009] Optionally, the drying module includes a single-cone dryer, an oil temperature machine, and a vacuum buffer tank. The single-cone dryer is provided with a stirring paddle for stirring the internal powder. The side wall of the single-cone dryer is provided with a drying pipe connected to the oil temperature machine, and the oil temperature machine is used to provide a high-temperature medium to the drying pipe for heating; the bottom of the single-cone dryer is provided with an output port for discharging the powder after drying; the top of the single-cone dryer is connected to the feeding port of the feed tank for receiving the powder fed from the feed tank; the vacuum buffer tank is installed on the top of the single-cone dryer for discharging moisture inside the single-cone dryer.

[0010] Optionally, a heat exchanger is provided on the pipeline connecting the vacuum buffer tank and the vacuum component, and the heat exchanger is used to cool the gas discharged from the vacuum buffer tank.

[0011] Optionally, the stirring paddle is a propeller blade capable of lifting the powder inside upwards.

[0012] Optionally, a fan is connected to the output port at the bottom of the single cone dryer, and the internal rotating blades of the fan are adapted to the shape of the bottom of the stirring paddle;

[0013] A discharge valve for controlling the shutoff is arranged below the blower.

[0014] Optionally, a discharging bin is provided below the discharging valve, and the top of the discharging bin is connected to a nitrogen back-blowing tank via a pipeline, so as to pressurize and discharge the powder material falling into the discharging bin.

[0015] Optionally, the vacuum assembly includes a vacuum tank and a vacuum pump, and the vacuum pump is used to evacuate the vacuum tank to generate negative pressure.

[0016] Optionally, the vacuum pump is connected to a water ring tank, and the water ring tank is used to filter trace dust particles contained in the gas.

[0017] The utility model provides a powder feeding, stirring and drying system, which is provided with a feeding module. When working, a vacuum component causes a feeding tank to generate a negative pressure suction effect, and the feeding tank draws powder from the powder feeding tank through a pipeline, and the powder enters the feeding tank along the pipeline. After the powder enters the feeding tank, the powder can be fed from a feeding port provided at the bottom of the feeding tank, and enters a drying module to heat and dry the powder. The automatic powder feeding process is realized by using a vacuum negative pressure suction method, and the powder moves in the pipeline, which can reduce the chance of contact with the outside world and reduce the probability of absorbing moisture in the air. In a specific embodiment, powder is fed from a feed tank into a single cone dryer, and the powder is stirred by a stirring paddle in the single cone dryer so that the powder is evenly in contact with the side wall of the single cone dryer. An oil temperature machine outputs a high-temperature medium to a drying pipe arranged on the side wall of the single cone dryer, so that the side wall of the single cone dryer is heated to heat the powder inside. The moisture generated after heating can be discharged from the single cone dryer to a vacuum buffer tank. When the drying process is completed, the powder can be discharged from an output port arranged at the bottom of the single cone dryer, effectively reducing the water content of the powder, thereby ensuring the quality of the solid electrolyte produced subsequently. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is an overall schematic diagram of the powder feeding, stirring and drying system provided by the utility model;

[0020] Figure 2 is a schematic diagram of a drying module and related components;

[0021] Figure 3 for Figure 2 A partial enlarged view of the dotted circle A.

[0022] The figure includes:

[0023] Drying module 1, single cone dryer 11, stirring paddle 111, oil temperature machine 12, drying tube 121, vacuum buffer tank 13, heat exchanger 14, fan shutoff fan 15, discharge valve 16, material delivery bin 17;

[0024] Feed module 2, vacuum assembly 21, vacuum tank 211, vacuum pump 212, water ring tank 213, feed tank 22, filter bag 221, nitrogen backflush tank 23, powder feeding tank 24. DETAILED DESCRIPTION

[0025] The core of the utility model is to provide a powder feeding, stirring and drying system, which utilizes vacuum feeding to dry the powder and reduce the moisture content.

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the powder feeding, stirring and drying system of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Combination Figure 1 As shown, the utility model provides a powder feeding, stirring and drying system, which includes a drying module 1 and a feeding module 2. The feeding module 2 can realize vacuum feeding, so as to automatically feed the powder. The drying module 1 is used to receive the powder fed by the feeding module 2, heat and dry the powder, and reduce the moisture content in the powder.

[0028] The feeding module 2 includes a vacuum component 21 and a feeding tank 22. A feeding port is provided at the bottom of the feeding tank 22. The feeding port of the feeding tank 22 is connected to the top of the single cone dryer 11 of the drying module 1. The powder in the feeding tank 22 can fall downward into the single cone dryer 11 under the action of gravity to realize the powder feeding. The vacuum component 21 is connected to the feed tank 22 through a pipeline, and the vacuum component 21 is used to generate negative pressure in the feed tank 22; the feed tank 22 is connected to the powder throwing tank 24 through a pipeline, and is used to suck powder from the powder throwing tank 24; the pipeline of the vacuum component 21 is connected to the upper position of the feed tank 22, and the pipeline of the powder throwing tank 24 is connected to the lower position of the feed tank 22. The vacuum component 21 generates negative pressure in the feed tank 22 by sucking air. The air pressure in the feed tank 22 is lower than the external atmospheric pressure, and powder is sucked from the powder throwing tank 24. The powder that has not been dried is stored in the powder throwing tank 24. When the powder enters the feed tank 22, it falls downward into the single cone dryer 11.

[0029] The utility model uses vacuum suction to realize the feeding process of powder, does not need manual dumping, realizes automatic powder feeding, can maintain continuous production, and the powder is sucked from the powder feeding tank 24 into the pipeline, which can reduce the time for the powder to contact with the outside air and reduce the probability of absorbing moisture in the air. In the subsequent process, the powder enters the single cone dryer 11 and is heated while being stirred, so that the excess water in the powder evaporates to form moisture and is discharged, and is discharged from the vacuum buffer tank 13. Through the process of continuous heating to generate moisture and discharge, the moisture contained in the powder reaches a sufficiently low state, and finally forms a powder with a low moisture content that meets the requirements.

[0030] On the basis of the above scheme, the utility model sets a filter bag 221 in the feed tank 22, the pipe connection point of the vacuum assembly 21 is located above the filter bag 221, and the pipe connection point of the powder tank 24 is located below the filter bag 221. The filter bag 221 blocks the powder entering the feed tank 22, and the vacuum assembly 21 forms a negative pressure suction effect, and the gas enters and exits the feed tank 22, thereby sucking the powder in the powder tank 24 into the feed tank 22. The gas can flow through the filter bag 221, but the powder cannot pass through the filter bag 221, which can prevent the powder from being sucked into the vacuum assembly 21. The filter bag 221 can adopt a detachable structure, which can be disassembled and replaced after a period of use; and filter bags 221 with different mesh diameters can be used according to powders of different diameters.

[0031] Furthermore, the utility model connects a nitrogen back-blowing tank 23 to the feed tank 22, and the nitrogen back-blowing tank 23 is used to blow air toward the upper surface of the filter bag 221. When the feeding is completed, the nitrogen back-blowing tank 23 blows air in the opposite direction toward the filter bag 221, which can blow down most of the powder adsorbed on the lower surface of the filter bag 221, thereby avoiding excessive powder accumulation affecting the ventilation effect.

[0032] The powder feeding, stirring and drying system of the utility model further comprises a drying module 1. Before the powder is formally used, the powder conveyed by the feeding module 2 enters the drying module 1 and is heated and dried in the drying module 1 to reduce the moisture content.

[0033] Combination Figure 1 , Figure 2 As shown, the drying module 1 includes a single cone dryer 11, an oil temperature machine 12, a vacuum buffer tank 13 and other structures. The single cone dryer 11 contains the powder to be dried, and the drying process is mainly completed in the single cone dryer 11. The overall shape of the single cone dryer 11 is large at the top and small at the bottom, and it is set to shrink from top to bottom, so that the powder can gradually gather downward, which is convenient for collection and discharge. The single cone dryer 11 is installed on a support frame to form a stable support.

[0034] A stirring paddle 111 for stirring the internal powder is provided in the single cone dryer 11. During the drying process, the internal powder is stirred by the stirring paddle 111, so that the powder is constantly stirred inside the single cone dryer 11. The powder is evenly distributed inside the single cone dryer 11 and changes position, so that the powder can contact the heat source more evenly and be fully heated. The motor drives the reducer output to rotate, and then drives the stirring paddle 111 to rotate, thereby achieving stirring. The motor and the reducer main shaft are integrated, which can greatly reduce the equipment failure rate and improve the transmission performance.

[0035] Combination Figure 2 , Figure 3As shown, a drying pipe 121 connected to the oil temperature machine 12 is provided on the side wall of the single cone dryer 11. The drying pipe 121 is buried in the side wall of the single cone dryer 11 (it can also be provided outside the side wall of the single cone dryer 11). The drying pipe 121 is spirally distributed and evenly surrounds the side wall of the single cone dryer 11. The oil temperature machine 12 has its own temperature control and heat transfer oil circulation system. The oil temperature machine 12 is used to provide high-temperature medium to the drying pipe 121 for heating. The oil temperature machine 12 heats the medium flowing through. The hot medium flows into the drying pipe 121 and dissipates heat to the single cone dryer 11 at the drying pipe 121. The heat is conducted to the powder inside the single cone dryer 11. The powder contacts the side wall of the single cone dryer 11 and is heated. The water contained in the powder evaporates to form moisture, and the water is discharged from the powder.

[0036] The vacuum buffer tank 13 is installed on the top of the single cone dryer 11, and a corresponding valve is provided to discharge the moisture inside the single cone dryer 11. The moisture is discharged from the powder into the air inside the single cone dryer 11, and this moisture needs to be discharged in time. The inside of the vacuum buffer tank 13 is low pressure. When the vacuum buffer tank 13 is connected to the single cone dryer 11, the gas can be extracted from the single cone dryer 11 to discharge the moisture. The negative pressure state of the vacuum buffer tank 13 is formed by the vacuum component 21.

[0037] An output port is arranged at the bottom of the single cone dryer 11. After the drying process is completed and the moisture content of the powder is reduced to meet the requirement, the dried powder is discharged through the output port for subsequent use.

[0038] Combination Figure 1 As shown, a heat exchanger 14 is provided on the pipeline connecting the vacuum buffer tank 13 and the vacuum assembly 21, and the heat exchanger 14 is used to cool the gas discharged from the vacuum buffer tank 13. The vacuum buffer tank 13 is used to extract hot gas from the single cone dryer 11. In order to prevent the hot gas from damaging the vacuum assembly 21, the gas discharged from the vacuum buffer tank 13 needs to be cooled, that is, the gas is cooled by the heat exchanger 14 before reaching the vacuum assembly 21.

[0039] The stirring paddle 111 used in the present invention is a propeller blade, and the stirring paddle 111 forms a spiral structure. When the stirring paddle 111 rotates, it can lift the internal powder upward, and the powder will fall downward due to gravity. The stirring paddle 111 can continuously lift the powder, so that the powder can form a more uniform stirring effect.

[0040] Combination Figure 1 , Figure 2As shown, the output port at the bottom of the single cone dryer 11 is connected to a shut-off fan 15, and the internal rotating blades of the shut-off fan 15 are adapted to the shape of the bottom of the stirring paddle 111. The shut-off fan is also called a discharger, an air lock valve, or a rotary valve. The shut-off fan is used in a pneumatic conveying pipeline, and a rotatable blade is arranged inside the fan. A certain amount of powder can be output every time the blade rotates a certain angle, and the direct connection between the inlet and outlet of the shut-off fan can be prevented. The blade acts as a partition and can effectively control the amount of powder falling. The rotating blades inside the shut-off fan 15 are adapted to the shape of the bottom of the stirring paddle 111, so that a uniform gap can be formed on the side and bottom of the stirring paddle 111, respectively, to ensure that the bottom of the stirring paddle 111 can also achieve stirring, avoid blind spots at the bottom that cannot be stirred, and achieve a more uniform stirring effect.

[0041] A discharge valve 16 for controlling the shutoff is arranged below the fan 15. The discharge valve 16 can be controlled to open and close, thereby fundamentally realizing the shutoff of the discharge.

[0042] A feeding bin 17 is provided below the discharge valve 16. The interior of the feeding bin 17 has a accommodating space. The powder discharged from the single cone dryer 11 first falls into the feeding bin 17 for temporary storage. A cavity is formed at the upper part of the inner cavity of the feeding bin 17. The top of the feeding bin 17 is connected to the nitrogen back-blowing tank 23 through a pipeline. There is high-pressure nitrogen inside the nitrogen back-blowing tank 23, and it is always connected to the gas source to maintain a high-pressure state. The nitrogen back-blowing tank 23 can discharge nitrogen into the feeding bin 17 to achieve pressurization, and is used to pressurize and discharge the powder falling into the feeding bin 17. The amount of powder output is related to the air pressure. The greater the air pressure, the more powder is discharged per unit time. A metering tank is connected to the rear of the feeding bin 17, and the powder output can be more accurately controlled by weighing.

[0043] Combination Figure 1 As shown, the vacuum component 21 includes a vacuum tank 211 and a vacuum pump 212. The vacuum pump 212 is used to evacuate the vacuum tank 211 to generate negative pressure. A large negative pressure is formed in the vacuum tank 211. The vacuum tank 211 is connected to the feed tank 22 and the heat exchanger 14 to ensure the stability of the negative pressure supply.

[0044] The vacuum pump 212 is connected to a water ring tank 213, and circulating water is continuously introduced into the water ring tank 213. When the gas passes through the water ring tank 213, the water ring tank 213 is used to filter the trace dust particles contained in the gas, and the filtered gas can be discharged into the atmosphere.

[0045] Valves are provided at corresponding positions on the pipeline to control the on / off state of the pipeline.

[0046] The following is an introduction to the specific work process:

[0047] The vacuum tank 211 is formed with negative pressure through the vacuum pump 212. When the pressure of the vacuum tank 211 reaches the set value, the corresponding pressure transmitter outputs a signal to the PLC (Programmable Logic Controller). The PLC outputs the signal to the intermediate relay to cut off the vacuum pump 212 and stop working. When the air pressure of the vacuum tank 211 is lower than the set value, the vacuum pump 212 is automatically turned on.

[0048] Under the action of the vacuum tank 211, the feed tank 22 forms a negative pressure suction effect, and the single cone dryer 11 is evacuated to a negative pressure, thereby sucking the feed. The single cone dryer 11 uses a stirring paddle 111 to evenly stir the powder in the bin to ensure that the split body is evenly heated.

[0049] The stirring blade 111 stirs while the oil temperature machine 12 is turned on to start the heating cycle. The powder tank 24 is pumped to the feed tank 22 through the pipeline negative pressure, and the filter bag 221 prevents the powder from being pumped into the vacuum component 21 during the vacuuming process.

[0050] The valve at the upper port of the single cone dryer 11 is opened to connect with the vacuum buffer tank 13 to release the pressure. The PLC control sets the opening time to 10 seconds, and the DCS (Distributed Control System) system runs automatically. The PLC sets the powder to be stirred for 30 minutes, and the negative pressure is drawn through the vacuum buffer tank 13 every 9 minutes for 1 minute. This is repeated during the drying and stirring process, and the PLC output signal is automatically controlled.

[0051] After the feeding is completed once, the nitrogen backflush tank 23 is used for backflush simultaneously. The nitrogen is injected for backflush and released at one time. The blowing impact force of the nitrogen backflush tank 23 blows away the powder in the filter bag.

[0052] The high-temperature and high-humidity exhaust gas generated during the mixing process is dangerous when passing through the vacuum pipeline. A heat exchanger 14 is added to the vacuum pipeline. The high-temperature and high-humidity steam generated when the powder is dried in the single-cone dryer 11 is cooled by heat exchanger 14 and then returned to the water ring tank 213 at the rear end of the pump through vacuum pump 212 for filtration, thereby meeting the emission requirements.

[0053] The powder is stirred and dried for 3 hours and then tested. When the moisture content reaches the requirement, the heating is stopped. After the negative pressure of the single cone dryer 11 is broken, the pneumatic discharge valve 16 of the discharge port is opened, and the fan 15 is started to deliver the dried powder to the delivery bin 17. The bottom valve of the delivery bin 17 is opened. The valve is opened and pressurized through the nitrogen backflush tank 23. It is automatically cut off after 8 kg is set each time. The metering data is obtained by the metering tank in the rear section, and the signal is transmitted to the cut-off valve at the bottom of the delivery bin 17 through the PLC for cutting.

[0054] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A powder feeding, stirring and drying system, characterized in that: It comprises a drying module (1) and a feeding module (2); The feeding module (2) comprises a vacuum component (21) and a feeding tank (22); the vacuum component (21) is connected to the feeding tank (22) via a pipeline, and is used to generate negative pressure in the feeding tank (22); the feeding tank (22) is connected to a powder feeding tank (24) via a pipeline, and powder is sucked from the powder feeding tank (24) by using the negative pressure; the powder entering the feeding tank (22) from the powder feeding tank (24) is fed into the drying module (1) through a feeding port provided at the bottom of the feeding tank (22); and the drying module (1) is used to heat and dry the powder.

2. The powder feeding, stirring and drying system according to claim 1, characterized in that: A filter bag (221) is arranged in the feed tank (22), a pipe connection point of the vacuum component (21) is located above the filter bag (221), and a pipe connection point of the powder feeding tank (24) is located below the filter bag (221).

3. The powder feeding, stirring and drying system according to claim 2, characterized in that: The feed tank (22) is connected to a nitrogen back-blowing tank (23), and the nitrogen back-blowing tank (23) is used to blow air toward the upper surface of the filter bag (221).

4. The powder feeding, stirring and drying system according to claim 1, characterized in that: The drying module (1) comprises a single cone dryer (11), an oil temperature machine (12), and a vacuum buffer tank (13); a stirring paddle (111) for stirring powder inside the single cone dryer (11) is arranged inside the single cone dryer (11); a drying pipe (121) connected to the oil temperature machine (12) is arranged on the side wall of the single cone dryer (11); the oil temperature machine (12) is used to provide a high-temperature medium to the drying pipe (121) for heating; an output port is arranged at the bottom of the single cone dryer (11) for discharging powder after drying; the top of the single cone dryer (11) is connected to the feeding port of the feeding tank (22) for receiving powder fed from the feeding tank (22); and the vacuum buffer tank (13) is installed at the top of the single cone dryer (11) for discharging moisture inside the single cone dryer (11).

5. The powder feeding, stirring and drying system according to claim 4, characterized in that: A heat exchanger (14) is provided on the pipeline connecting the vacuum buffer tank (13) and the vacuum component (21), and the heat exchanger (14) is used to cool the gas discharged from the vacuum buffer tank (13).

6. The powder feeding, stirring and drying system according to claim 4, characterized in that: The stirring paddle (111) is a propeller blade capable of lifting the powder inside upwards.

7. The powder feeding, stirring and drying system according to claim 4, characterized in that: A fan (15) is disposed at the outlet at the bottom of the single cone dryer (11), and the internal rotating blades of the fan (15) are adapted to the shape of the bottom of the stirring paddle (111); A discharge valve (16) for controlling the shutoff is provided below the fan (15).

8. The powder feeding, stirring and drying system according to claim 7, characterized in that: A material dispensing bin (17) is provided below the discharge valve (16), and the top of the material dispensing bin (17) is connected to a nitrogen backflush tank (23) via a pipeline, so as to discharge the powder material falling into the material dispensing bin (17) under pressure.

9. The powder feeding, stirring and drying system according to claim 1, characterized in that: The vacuum component (21) comprises a vacuum tank (211) and a vacuum pump (212), wherein the vacuum pump (212) is used to evacuate the vacuum tank (211) to generate negative pressure.

10. The powder feeding, stirring and drying system according to claim 9, characterized in that: The vacuum pump (212) is connected to a water ring tank (213), and the water ring tank (213) is used to filter trace dust particles contained in the gas.

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