Micro-nano powder surface deposition coating rotary kiln

Abstract

The utility model relates to the field of micro-nano powder surface deposition coating equipment, and provides a micro-nano powder surface deposition coating rotary kiln which comprises a kiln body, a partition bin composed of a kiln body rotary pipe, a porous dispersion plate and a baffle, a working gas system and a feeding device. The working gas system comprises a plurality of fluidized coating material or gaseous coating precursor material gas inlet pipes and a proportional valve group, the proportional valve group is controlled by a PLC (Programmable Logic Controller) to enable the gas inlet pipes to enter gas from a partition bin of a furnace body rotary pipe and to be in contact with a deposited and coated micro-nano material through a porous dispersion plate, and the rest gas inlet pipes are closed to realize small-flow or intermittent gas inlet. According to the utility model, the plurality of air inlet pipes are arranged in the furnace body rotary pipe, and the PLC is combined to control the proportional valve group to control the air inlet pipes, so that the deposited and coated micro-nano powder raw material is always concentrated at the lower part in the furnace body rotary pipe, the micro-nano powder and the coated raw material are ensured to be fully contacted, the coating is uniform, and the production efficiency is high; the coating time is shortened; and the wear damage between particles is reduced.

Description

Technical Field

[0001] The utility model relates to the field of micro-nano powder surface deposition and coating equipment, in particular to a micro-nano powder surface deposition and coating rotary kiln. Background Art

[0002] The existing positive and negative electrode materials are deposited and coated in a rotary kiln. The rotary kiln is a straight cylindrical structure. During the coating process, the fluidized coating material is introduced from the middle of one end of the rotary kiln and discharged from the other end, so that the concentration of the fluidized coating material is concentrated in the middle and upper part of the furnace body rotary tube, while the micro-nano powder material to be deposited and coated is concentrated at the bottom of the furnace body rotary tube, resulting in insufficient contact, low production efficiency of deposition and coating of positive and negative electrode materials, and serious waste of raw materials; in addition, due to the low concentration of the fluidized coating material at the lower end of the furnace body rotary tube, the deposition and coating time of the micro-nano powder material to be deposited and coated is greatly increased, and the deposited and coated micro-nano powder material is constantly rolling in the furnace body and rubbing against each other, causing the deposition coating layer on the surface of the particles to fall off, the coating is uneven, and the thickness is different, which affects the quality of deposition and coating of positive and negative electrode materials. Therefore, it is a technical problem that urgently needs to be solved. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings of the prior art and to provide a rotary kiln equipment with a simple structure, good effect, convenient use, and continuous large-scale micro-nano powder material deposition and coating modification process production, which can make the fluidized coating material fully contact, penetrate, and diffuse between the micro-nano powder materials to be deposited and coated, and heat and crack, and deposit and coat; the surface of the micro-nano powder material is deposited and coated uniformly, the production efficiency is high, the raw material utilization rate is high, and the mutual wear and damage between the particles can be reduced, so as to ensure that the deposition and coating thickness of the produced micro-nano powder material is uniform and the performance is excellent.

[0004] The technical solution of the utility model is: a rotary kiln for micro-nano powder surface deposition and coating, comprising a furnace body and a sandwich multi-compartment structure composed of a rotary tube, a porous dispersion plate and a baffle in the furnace body, a working gas system and a feeding device, the feeding device is arranged at the air inlet end of the furnace body rotary tube through a hose acceleration card device, the working gas system is arranged in the furnace body, the working gas system comprises a plurality of fluidized coating material or gaseous coating precursor material inlet pipes, the inlet pipes are arranged along the length direction of the furnace body and are evenly distributed in the sandwich multi-compartment on the inner wall of the furnace body rotary tube, a proportional valve group is provided on the inlet pipe, the inlet pipe is connected to the inlet main pipe through a rotary joint, the proportional valve group is controlled by a PLC controller to make the inlet pipe take in air from the compartment in the furnace body rotary tube, and through the porous dispersion plate, the inlet pipe contacts, penetrates, diffuses, mixes, homogenizes, heats, cracks, deposits and coats the micro-nano powder material to be deposited and coated in a concentrated thick layer state, and the remaining sandwich compartment inlet pipes are closed, or take in air at a small flow rate, or take in air intermittently.

[0005] Preferably, in order to ensure the effect and conditions of deposition coating, heating devices are provided in the upper and lower parts of the furnace body to ensure that the temperature inside the furnace body is the optimal deposition coating temperature. The utility model arranges an air intake pipe in the multi-compartment interlayer in the furnace body rotary tube, and controls the air intake of the air intake pipe in combination with the PLC controller to control the proportional valve group, thereby ensuring that the air intake is always in the bottom compartment of the furnace body rotary tube during the rotation of the furnace body rotary tube, so that the deposition coating micro-nano powder raw materials under mechanical fluidization are always in a concentrated state on the inner wall of the porous dispersion plate in the lower part of the furnace body rotary tube and fully contact with the micro-nano powder, so as to achieve the effect and effect of rapid coating, reduce the mutual friction damage between particles, and thus solve the problems of straight in and out of the coating material, too long coating time, and uneven coating.

[0006] Furthermore, a sensor is provided at the bottom of the furnace body, and the sensor includes a transmitter and a receiver at the corresponding position of the air inlet pipe. The sensor transmits the received signal to the PLC controller, and the PLC controller controls the start-up of the proportional valve group. The PLC can also control the operation of the entire device. Preferably, the sensor is arranged at the bottom of the feed end of the furnace body rotary pipe, and the PLC controller controls the proportional valve group to control the air intake sequence and air intake volume of different air inlet pipes. More preferably, the transmitter is arranged below the furnace body rotary pipe, and the receiver is arranged on the furnace body rotary pipe and rotates with the furnace body rotary pipe. Through the control of the sensor, the air inlet pipe at the lower end of the furnace body rotary pipe is always the main air inlet pipe, and the other air inlet pipes are set according to the needs of use. The remaining air inlet pipes are closed, and air is supplied at a small flow rate or intermittently, so that the micro-nano powders attached to the inner wall or suspended in the furnace body rotary pipe can also continue to fully contact with the coating raw materials; ensuring that the concentration of the coating raw materials at the lower end of the furnace body rotary pipe is the largest, and can be in contact with the furnace. The micro-nano powder materials in the furnace body rotary tube are fully mixed to ensure the efficiency and quality of the micro-nano powder material coating; more specifically, due to the rotation of the rotary tube, the micro-nano powder materials under mechanical fluidization are always in the lower part of the furnace body rotary tube, and the outer wall of the porous dispersion plate of the interlayer partition is in a concentrated thick layer accumulation state. The fluidized coating material or the gaseous coating precursor material is fully contacted, penetrated, and diffused between the micro-nano powder materials to be deposited and coated, and is heated, cracked, deposited and coated, thereby ensuring the efficiency and quality of the deposition and coating of the micro-nano powder materials.

[0007] Furthermore, a plurality of baffles are evenly distributed along the length direction of the inner wall of the furnace body rotary tube, an air inlet pipe is arranged between the baffles, and a portion of the baffle is provided with a flow hole for the micro-nano powder material to rotate with the rotary tube. Preferably, the baffles are arranged along the length direction of the furnace body rotary tube and extend toward the central axis of the furnace body rotary tube, so that the upper end of the spacing between two adjacent baffles is tightened, and the length of the extension does not exceed half of the radius, so that the coated raw materials are concentrated between the baffles, ensuring the concentration of the coated raw materials between the baffles and reducing the direct discharge of the coated raw materials to the outside of the bottom baffle; the flow holes are concentrated on one side close to the inner wall of the furnace body rotary tube, which can reduce the coated raw materials from running out of the baffle. In addition, when the furnace body rotary tube rotates, the micro-nano powder first falls from the flow holes of the baffle. The amount of micro-nano powder that falls first is relatively small, and its coating effect is the best, and this part of the micro-nano powder is deposited on the surface. After being coated, the powder will first enter the next baffle from the flow hole, thereby reducing the damage caused by the friction between the coated micro-nano powder and other powders. In addition, the furnace body rotary tube continues to rotate and can disperse the micro-nano powder when it enters the baffle through the flow hole, thereby improving the full contact and mixing between the micro-nano powder and the coating raw materials and improving the coating efficiency. The furnace body rotary tube continues to rotate and the coating raw materials can also enter the baffle at the upper end from the flow hole, which can provide a high concentration of coating raw materials for the micro-nano powder remaining therein that has not fallen off, so that the micro-nano powder can enter the next baffle, and the above coating process is repeated to achieve fast and efficient coating.

[0008] Furthermore, a porous dispersion plate is provided between the baffles, and a plurality of gas dispersion holes are provided on the porous dispersion plate. The porous dispersion plate is installed and fixed on the inner wall of the rotary tube of the furnace body to form a sandwich multi-compartment structure; the arrangement of the porous dispersion plate and the dispersion holes facilitates the dispersion of the coated raw materials, improves the sufficient mixing and contact between the coated raw materials and the micro-nano powders, improves the coating efficiency, and avoids the dead corners without coated raw materials.

[0009] Furthermore, the interior of the furnace body rotary tube has a sandwich multi-compartment structure along its length. The air inlet pipe is distributed within the sandwich compartment structure. A porous dispersion plate is disposed on the inner sidewall of the sandwich compartment, and its pore size is smaller than the particle size of the micro-nano material to be deposited and coated. The sandwich compartment structure is provided with a number of evenly spaced partitions, and the baffles are arranged correspondingly to the partitions. Preferably, the sandwich compartment structure is divided into several compartments by partitions. The compartments can be directly connected to the air inlet pipe, and the compartments are connected to the furnace body rotary tube via branch pipes, thereby reducing the cost of installing the air inlet pipe and preventing micro-nano powder from entering the air inlet pipe.

[0010] Furthermore, a receiving closure that disconnects the air supply is provided at the corresponding position of the baffle. The receiving closure and the receiver are located on the same circumference, so that during the rotation of the furnace body rotary tube, air is always introduced into the bottom interlayer compartment of the furnace body rotary tube. The rotary tube rotates, causing the micro-nano powder material under mechanical fluidization to always be concentrated in a thick layer on the outer wall of the porous dispersion plate of the interlayer compartment in the lower part of the furnace body rotary tube. The fluidized coating material or gaseous coating precursor material will fully contact, penetrate, diffuse, mix, and homogenize among the micro-nano powder materials to be deposited and coated, and then be heated, cracked, and deposited for coating. Preferably, when the previous air inlet pipe is just closed, the next air inlet pipe begins to take in air as the main air inlet pipe, ensuring that the concentration of the coating raw material between the next baffle can fully contact and mix with the micro-nano powder material. The furnace body rotary tube continuously rotates back and forth to repeat the above coating process.

[0011] Furthermore, the rotary kiln for micro-nano powder surface deposition coating also includes a working gas tank connected to the gas inlet manifold and a collection device located at the furnace outlet. Preferably, the working gas tank continuously supplies shielding gas and carrier gas to the furnace's rotary tube. A mixing tank is located between the working gas tank and the gas inlet manifold for mixing the coating material with the shielding gas, carrier gas, and other gases. The collection device is used to collect the coated micro-nano powder.

[0012] Furthermore, a vacuum unit is provided between the collecting device and the furnace body rotary tube, and the furnace body rotary tube is vacuumed before the micro-nano powder surface is deposited and coated to ensure safety and coating efficiency during the coating process.

[0013] Furthermore, the collection device includes a cyclone separator and a precision filter. The deposited and coated micro-nano powder material is first separated and collected by the cyclone separator and then collected by the precision filter. The lower ends of the cyclone separator and the precision filter are respectively provided with a first collection tank and a second collection tank.

[0014] Furthermore, an exhaust pipe is provided at the tail of the precision filter, and a concentration detector and a gas recovery port are provided on the exhaust pipe. The gas recovery port is transported to the mixing tank for recycling through a return air pipe, and excess gas is discharged from the exhaust port through the exhaust valve on the exhaust pipe.

[0015] The utility model has the following features: the utility model has a simple structure and is easy to use. By arranging multiple air inlet pipes in the furnace body rotary tube and combining the PLC controller to control the proportional valve group to control the air intake of the air inlet pipe, the deposited and coated micro-nano powder raw materials under mechanical fluidization are always concentrated in the lower part of the furnace body rotary tube and the inner wall of the porous dispersion plate, thereby ensuring full contact between the micro-nano powder and the coated raw materials, uniform coating of the micro-nano powder surface, high production efficiency, reducing the coating time of the micro-nano powder in the furnace body rotary tube and the mutual wear damage between particles, and ensuring the uniformity of the coating material coating.

[0016] The detailed structure of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 - is a schematic diagram of the structure of this utility model;

[0018] Figure 2 - is a schematic diagram of the furnace structure of the utility model;

[0019] Figure 3 - is a schematic diagram of the internal structure of the rotary tube of the furnace body of the utility model;

[0020] Figure 4 -for Figure 3 A partial enlarged schematic diagram of the end of the rotary tube in the middle furnace body;

[0021] 1-heating device, 2-feeding device, 3-vacuuming pipe, 4-protective gas pipe, 5-hose acceleration card device, 6-working gas storage tank, 7-mixing tank, 8-first rotary joint, 9-proportional valve group, 10-reduction unit, 11-sensor, 12-furnace body rotary pipe, 13-vacuuming unit, 14-second rotary joint, 15-vacuum valve, 16-cyclone separator, 17-precision filter, 18-concentration detector, 19-gas recovery port, 20-return air pipe, 21-exhaust port, 22-fixed wheel, 23-inlet main pipe, 24-transmitter, 25-first receiver, 26-fourth receiving closer, 27-first receiving closer, 28-second receiver, 29-sandwich compartment structure, 30-inlet pipe, 31-flow hole, 32-porous dispersion plate, 33-dispersion hole, 34-baffle, 35-partition. DETAILED DESCRIPTION

[0022] As shown in the attached figure: a micro-nano powder surface deposition coating rotary kiln, including a furnace body and a sandwich multi-compartment structure composed of a rotary tube 12 and a porous dispersion plate 32 and a baffle in the furnace body, a working gas system and a feeding device 2, the feeding device 2 is arranged at the air inlet end of the furnace body rotary tube 12 through a hose acceleration card device 5, the working gas system is arranged in the furnace body, the working gas system includes a plurality of fluidized coating material or gaseous coating precursor material inlet pipes 30, the inlet pipes 30 are arranged along the length direction of the furnace body and are evenly distributed in the furnace body. In the multiple compartments of the interlayer on the inner wall of the furnace body rotary tube 12, a proportional valve group 9 is provided on the air inlet pipe 30, and the air inlet pipe 30 is connected to the air inlet main pipe 23 through a rotary joint. The proportional valve group 9 controls the air inlet pipe 30 through the PLC controller to let air in from the compartment in the furnace body rotary tube 12, and through the porous dispersion plate 32, the air is contacted, infiltrated, diffused, mixed, homogenized, heated, cracked, deposited and coated with the micro-nano powder material to be deposited and coated in a concentrated thick layer state. The air inlet pipes of the remaining interlayer compartments are closed, or air is introduced at a small flow rate, or intermittently.

[0023] Preferably, a fixed wheel 22 is provided at one end of the furnace body rotating tube 12 close to the proportional valve group 9, and a reducer unit 10 is provided below the furnace body rotating tube 12. The reducer unit 10 drives the rotation of the furnace body rotating tube 12 through a belt or gear. Brushes are provided on the furnace body rotating tube 12 through insulators to ensure that the air inlet end and receiver and other components of the furnace body rotating tube 12 are powered. A first rotary joint 8 and a second rotary joint 14 are provided at both ends of the furnace body rotating tube 12 respectively. The first rotary joint 8 is arranged at the air inlet end, and the second rotary joint 14 is arranged at the tail to ensure that the furnace body rotating tube 12 is not hindered during rotation and can maintain a tight connection.

[0024] Preferably, in order to avoid the influence of air on the coating of the micro-nano powder substrate in the feeding device 2, a vacuum pipe 3 and a protective gas pipe 4 are provided on the feeding device 2. The vacuum pipe 3 is connected to the vacuum unit 13. Before adding the substrate into the furnace body rotary tube 12, the feeding device 2 is first vacuumed by the vacuum unit 13, and then the protective gas argon is introduced through the protective gas pipe 4 to ensure the vacuum degree in the feeding device 2 and the protection of the substrate by gas replacement. More preferably, in order to ensure the effect and conditions of coating, the upper and lower parts of the furnace body are provided with a heating device 1, which is a resistance heater to ensure that the temperature in the furnace body rotary tube 12 is the optimal coating temperature. The utility model sets an air intake pipe 30 in the multi-compartment interlayer in the furnace body rotary tube, and controls the air intake of the air intake pipe 30 in combination with the PLC controller to control the proportional valve group 9, thereby ensuring that the main air intake end of the air intake pipe 30 is always in the bottom compartment of the furnace body rotary tube 12 during the rotation of the furnace body rotary tube 12, so that the deposited coating micro-nano powder raw materials under mechanical fluidization are always in a concentrated state on the inner wall of the porous dispersion plate in the lower part of the furnace body rotary tube 12 and fully contact with the micro-nano powder, so as to achieve the effect and effect of rapid coating, reduce the mutual friction damage between particles, and thus solve the problems of straight in and out of the coating material, too long coating time, and uneven coating.

[0025] In the embodiment, a sensor 11 is provided at the bottom of the furnace body rotary tube 12. The sensor 11 includes a transmitter 24 and a receiver located at a corresponding position on the air inlet pipe 30. The position of the receiver can also be adjusted according to convenience. The sensor 11 transmits the received signal to the PLC controller, which controls the activation of the proportional valve group 9. Preferably, the transmitter 24 is located below the furnace body rotary tube 12, and the receiver is located on the furnace body rotary tube 12 and rotates with the furnace body rotary tube 12. Under the control of the sensor 11, the air inlet pipe 30 located at the lower end of the furnace body rotary tube 12 is always the main air inlet pipe 30. The other air inlet pipes 30 are configured according to usage needs. The remaining air inlet pipes 30 are closed, have a low flow rate, or are intermittently supplied. This ensures that the coating raw material concentration at the lower end of the furnace body rotary tube 12 is maximized, can be fully mixed with the micro-nano powder material in the furnace body rotary tube 12, and ensures the efficiency and quality of the micro-nano powder material coating.

[0026] Specifically, in this embodiment, four air inlet pipes 30 are provided, the transmitter 24 is fixed on the base below the furnace body rotary tube 12, and the furnace body rotary tube 12 is provided with a first receiver 25, a first receiving closer 27, a second receiver 28, a second receiving closer, a third receiver, a third receiving closer, a fourth receiver, and a fourth receiving closer 26 in sequence. The first receiver 25 is provided at the rear end of the rotation direction of the furnace body rotary tube 12, and the first receiving closer 27 is provided at the front end of the rotation direction of the furnace body rotary tube 12. After receiving the signal from the transmitter 24, the first receiver 25 transmits it to the PLC controller, and the PLC controls The device starts the first air inlet pipe 30 as the main air inlet pipe 30 to start continuous air intake. When the first receiving closer 27 receives the signal from the transmitter 24, it delays for 1 second or slowly closes the valve on the first air inlet pipe 30, and the furnace body rotary pipe 12 continues to rotate. Before the first air inlet pipe 30 is completely closed, the second receiver 28 receives the signal from the transmitter 24 and starts the air intake of the second air inlet pipe 30. The above process is repeated. When one of the air inlet pipes 30 is the main air inlet pipe 30, the other three air inlet pipes 30 are used for small flow intake to ensure that the concentration of the coating material at the bottom of the furnace body rotary pipe 12 is the highest, thereby ensuring its coating effect and efficiency.

[0027] In the embodiment, four baffles 34 are evenly distributed in the furnace body rotary tube 12, and a plurality of flow holes 31 are provided on the baffles 34. The air inlet pipe 30 is arranged between the baffles 34. Preferably, the baffles 34 are arranged along the length direction of the furnace body rotary tube 12 and extend toward the central axis of the furnace body rotary tube 12, so that the upper end of the spacing between two adjacent baffles 34 is tightened, and the extension length does not exceed half of the radius, so that the coating raw materials are concentrated between the baffles 34, ensuring the concentration of the coating raw materials between the baffles 34 and reducing the direct discharge of the coating raw materials to the outside of the bottom baffle 34; the flow holes 31 are concentrated on the side close to the inner wall of the furnace body rotary tube 12, which can reduce the coating raw materials from running out of the baffle 34. In addition, when the furnace body rotary tube 12 rotates, the micro-nano powder first falls from the flow holes 31 of the baffle 34. The amount of micro-nano powder that falls first is relatively small, and its coating effect is the best, and this part of the micro-nano powder has the best coating effect. After the final surface is deposited and coated, it will first enter the next baffle 34 from the flow hole 31, thereby reducing the damage caused by the friction between the coated micro-nano powder and other powders. In addition, the furnace body rotary tube 12 continues to rotate and can disperse the micro-nano powder when it enters the baffle 34 through the flow hole 31, thereby improving the full contact and mixing between the micro-nano powder and the coating raw material, and improving the coating efficiency; the furnace body rotary tube 12 continues to rotate and the coating raw material can also enter the baffle 34 at the upper end from the flow hole 31, and can provide a high concentration of coating raw materials for the part of the micro-nano powder that remains therein and has not fallen off, so that the micro-nano powder enters the next baffle 34, and the above coating process is repeated to achieve fast and efficient coating.

[0028] In the embodiment, a porous dispersion plate 32 is provided between the baffles 34, and a plurality of dispersion holes 33 are provided on the porous dispersion plate 32. The porous dispersion plate 32 is installed and fixed on the inner wall of the furnace body rotary tube 12, so as to facilitate the dispersion of the coated raw materials, improve the sufficient mixing and contact between the coated raw materials and the micro-nano powders, improve the coating efficiency, and avoid the dead corners without coated raw materials.

[0029] In another embodiment, the furnace body rotary duct 12 comprises a sandwich compartment structure 29. The air inlet pipe 30 is distributed within the sandwich compartment structure 29 and enters the furnace body rotary duct 12 via several branch pipes. The sandwich compartment structure is provided with several evenly spaced partitions 35, and the baffles 34 are provided corresponding to the partitions 35. Preferably, in this embodiment, the sandwich compartment structure 29 is divided into several compartments by partitions 35. Each compartment can be directly connected to the air inlet pipe 30, and the compartments are connected to the furnace body rotary duct 12 via branch pipes. This reduces the installation cost of the air inlet pipe 30 and prevents micro-nano powder from entering the air inlet pipe 30. More preferably, a receiving closer that disconnects the air supply is provided at the position corresponding to the baffle 34, and the receiving closer and the receiver are located on the same circumference. When the previous air inlet pipe 30 is just closed, the next air inlet pipe 30 starts to take in air as the main air inlet pipe 30 to ensure that the concentration of the coating raw materials between the next baffle 34 can fully contact and mix with the micro-nano powder material. The furnace body rotary tube 12 continuously rotates back and forth to perform the above coating process.

[0030] In this embodiment, the rotary kiln for micro-nano powder surface deposition coating further includes a working gas storage tank 6 connected to the air inlet manifold 23 and a collection device disposed at the outlet end of the furnace body rotary tube 12. Preferably, the working gas storage tank 6 continuously provides shielding gas and carrier gas to the furnace body rotary tube 12. A mixing tank 7 is disposed between the working gas storage tank 6 and the air inlet manifold 23. The mixing tank 7 is used to mix the coating material with the shielding gas, carrier gas, etc. The mixing tank 7 may contain cracked methane, argon, hydrogen, and recycled tail gas. The hydrogen and cracked methane are introduced into the mixing tank 7 through a pipeline for mixing, and are then transported into the furnace body rotary tube 12 using argon as carrier gas and shielding gas. The collection device is used to collect the coated micro-nano powder.

[0031] A vacuum unit 13 is also provided between the collection device and the furnace body rotary tube 12. Before the micro-nano powder is deposited and coated on the surface, the furnace body rotary tube 12 is first vacuumed to ensure safety and coating efficiency during the coating process. In order to improve the convenience of using the vacuum unit 13, vacuum valves 15 are provided on the left and right sides of the pipe interface of the vacuum unit 13. Preferably, the collection device includes a cyclone separator 16 and a precision filter 17. The coating material is first separated and collected by the cyclone separator 16, and then collected by the precision filter 17. The lower ends of the cyclone separator 16 and the precision filter 17 are respectively provided with a first collection tank and a second collection tank. More preferably, an exhaust pipe is provided at the tail end of the precision filter 17. The exhaust pipe is provided with a concentration detector 18 and a gas recovery port 19. The gas recovery port 19 is transported to the mixing tank 7 for recycling through the return gas pipe 20. The excess gas is discharged from the exhaust port 21 through the exhaust valve on the exhaust pipe.

[0032] During use, the equipment is first inspected. After the inspection is completed, the equipment is vacuumed and protective gas is introduced. The coating raw materials are introduced into the air inlet pipe 30, and then the coating substrate is added through the feeding device 2. After a single addition, the hose is removed to accelerate the connection between the card device 5 and the feeding device to avoid affecting the rotation of the furnace body rotary tube. Through the rotation of the furnace body rotary tube 12 and the control of air intake, the concentration of the coating raw materials at the bottom of the furnace body rotary tube 12 is always guaranteed to be the highest, so that the substrate micro-nano powder is fully in contact with the coating raw materials and is quickly coated, thereby improving the coating efficiency of the material, reducing the material coating time and the mutual friction damage between the particles, improving the coating quality, and ensuring the uniformity of the coating thickness of the coating material.

[0033] The utility model has a simple structure and is easy to use. By arranging multiple air inlet pipes 30 in the furnace body rotary tube 12 and controlling the air intake of the air inlet pipes 30 in combination with a PLC controller to control the proportional valve group 9, the coating raw materials are concentrated at the lower end of the furnace body rotary tube 12, thereby ensuring full contact between the micro-nano powder and the coating raw materials, uniform coating of the micro-nano powder surface, high production efficiency, reducing the coating time of the micro-nano powder in the furnace body rotary tube 12 and the mutual wear damage between the particles, and ensuring the uniformity of the coating of the coating material.

[0034] The above is a preferred embodiment of the present invention and the technical principles used therein. For those skilled in the art, any obvious changes such as equivalent transformations, simple replacements, etc. based on the technical solution of the present invention, without departing from the spirit and scope of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A rotary kiln for deposition and coating of micro-nano powders, comprising a furnace body, a rotating tube within the furnace body, a sandwich multi-compartment structure consisting of a porous dispersion plate and a baffle, a working gas system, and a feeding device. The feeding device is disposed at the air inlet end of the rotating tube of the furnace body via a hose accelerator device, and the working gas system is disposed within the furnace body. The kiln is characterized by: The working gas system includes several fluidized coating material or gaseous coating precursor material inlet pipes, which are arranged along the length direction of the furnace body and evenly distributed in the multiple compartments of the inner wall of the furnace body rotary tube. A proportional valve group is provided on the inlet pipe, and the inlet pipe is connected to the inlet main pipe through a rotary joint. The proportional valve group controls the inlet pipe to let air in from the compartment in the furnace body rotary tube, and through the porous dispersion plate, the inlet pipe contacts, penetrates, diffuses, mixes, homogenizes, heats, cracks, and deposits and coats the micro-nano powder material to be deposited and coated in a concentrated thick layer state. The inlet pipes of the remaining interlayer compartments are closed, or air is fed in at a small flow rate, or intermittently.

2. The micro-nano powder surface deposition coating rotary kiln according to claim 1, characterized in that: A sensor is provided at the bottom of the feed end of the furnace body rotary tube. The sensor includes a transmitter and a receiver at the corresponding position of the intake pipe. The sensor transmits the received signal to the PLC controller. The PLC controller controls the proportional valve group to control the intake sequence and intake volume of different intake pipes.

3. The micro-nano powder surface deposition coating rotary kiln according to claim 2, characterized in that: A plurality of baffles are evenly distributed along the length of the inner wall of the furnace body rotary tube, the air inlet pipe is arranged between the baffles, and a portion of the baffle is provided with flow holes for the micro-nano powder material to rotate with the rotary tube.

4. The micro-nano powder surface deposition coating rotary kiln according to claim 3, characterized in that: A porous dispersion plate is provided between the baffles, and a plurality of gas dispersion holes are provided on the porous dispersion plate. The porous dispersion plate is fixed on the inner wall of the furnace body rotary tube through the baffles to form a sandwich multi-compartment structure.

5. The micro-nano powder surface deposition coating rotary kiln according to claim 4, characterized in that: The length direction of the furnace body rotary tube is a sandwich multi-compartment structure, the air inlet pipe is distributed in the sandwich compartment structure, the porous dispersion plate is arranged on the inner wall of the sandwich compartment, and its pore size is smaller than the particle size of the micro-nano material to be deposited and coated. A number of evenly distributed partitions are provided in the sandwich compartment structure, and the baffles are arranged corresponding to the partitions.

6. The micro-nano powder surface deposition coating rotary kiln according to claim 5, characterized in that: A receiving closer that disconnects the air supply is provided at the corresponding position of the baffle, and the receiving closer and the receiver are located on the same circumference, so that air is always introduced into the bottom interlayer compartment of the furnace body rotating tube during the rotation of the furnace body rotating tube. The rotating tube rotates so that the micro-nano powder material under mechanical fluidization is always concentrated in a thick layer on the outer wall of the porous dispersion plate of the interlayer compartment in the lower part of the furnace body rotating tube. The fluidized coating material or the gaseous coating precursor material will fully contact, penetrate, diffuse, mix, and homogenize between the micro-nano powder materials to be deposited and coated, and will be heated, cracked, and deposited and coated.

7. The micro-nano powder surface deposition coating rotary kiln according to any one of claims 1 to 6, characterized in that: It also includes a working gas storage tank connected to the air inlet main pipe and a collecting device arranged at the outlet end of the furnace body.

8. The micro-nano powder surface deposition coating rotary kiln according to claim 7, characterized in that: A vacuum pumping unit is also provided between the collecting device and the furnace body rotary tube.

9. The micro-nano powder surface deposition coating rotary kiln according to claim 8, characterized in that: The collecting device includes a cyclone separator and a precision filter. The deposited and coated micro-nano powder material is first separated and collected by the cyclone separator and then collected by the precision filter. The lower ends of the cyclone separator and the precision filter are respectively provided with a first collection tank and a second collection tank.

10. The micro-nano powder surface deposition coating rotary kiln according to claim 9, characterized in that: An exhaust pipe is provided at the tail of the precision filter, and a concentration detector and a gas recovery port are provided on the exhaust pipe. The gas recovery port transports the gas to the mixing tank for recycling through the return air pipe, and the excess gas is discharged from the exhaust port through the exhaust valve on the exhaust pipe.

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