Flow drying device for surface modification of superfine diamond micropowder

Abstract

A flow drying device for surface modification of superfine diamond micro powder solves the problem that when the drying efficiency of the diamond micro powder is improved, the drying temperature is high, and the flowing speed of the micro powder is too high or too low, so that the drying efficiency and quality of the micro powder are affected. Comprising a drying bin which is a micro powder drying main body, a hot air blower provides hot air, the hot air is conveyed into the drying bin, a first cyclone separator and a second cyclone separator through a hot air main pipeline, the micro powder is dried, the micro powder and air are separated, and an exhaust fan is used for extracting air in the first cyclone separator and the second cyclone separator. A flow dryer is fixedly connected into the drying bin and comprises annular partition plates, each annular partition plate is provided with a discharging port, the lower ends of the annular partition plates are integrally connected with a perforated plate, and an air outlet device is arranged below the perforated plate, so that micro powder is in a suspended state in the drying process, and agglomeration of the micro powder is avoided; hot air makes full contact with the micro powder, the drying efficiency is improved, the flowing speed of the micro powder is slowed down, and the drying temperature does not need to be too high.

Description

Technical Field

[0001] The invention belongs to the technical field of micro powder drying equipment, and in particular relates to a flow drying device for surface modification of ultrafine diamond micro powder. Background Art

[0002] Ultrafine diamond powder has a very small particle size and a very high specific surface area. Diamond powder often contains a certain amount of moisture during the preparation process. If this moisture is not handled properly during the drying process, the powder particles are easily agglomerated due to surface tension, van der Waals force, etc., affecting their use effect. Traditional drying uses a static drying method. Although it can remove moisture, the local temperature is too high and the overall heating is uneven, especially the part close to the heat source, which is easy to cause hard agglomeration of fine-grained products, affecting the dispersibility and performance of the product. In order to solve these problems, diamond powder surface modification flow drying technology came into being.

[0003] Flow drying can keep the micropowder in a suspended and flowing state, and separate the particles from each other, effectively avoiding the occurrence of agglomeration. After surface modification, the ultrafine diamond micropowder may have a layer of modifier on its surface. During flow drying, hot air or other drying media can evenly contact the micropowder, so that the modifier dries and solidifies more evenly on the surface of the micropowder, and there will be no excessive or insufficient local modification.

[0004] In order to completely dry more micropowders at one time, the current flow drying device must have a higher temperature to allow more micropowders to dry quickly and improve drying efficiency. However, too high a temperature will cause the modified layer on the surface of the micropowder to decompose, oxidize or undergo other chemical reactions. In addition to choosing the appropriate drying temperature, the influence of the flow rate must also be considered. If the flow rate is too fast, the micropowders may not be fully heated during the drying process, affecting the drying effect. If the flow rate is too slow, the drying time may be prolonged and the production cost may be increased. Therefore, it is crucial to reasonably control the flow rate and drying temperature of diamond micropowders to improve drying efficiency and quality. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a flow drying device for surface modification of ultrafine diamond micropowder, which solves the problem that higher temperature and flow rate are required to improve the drying efficiency of diamond micropowder, but high temperature will destroy the surface modification layer of the micropowder, fast flow rate will easily cause the micropowder to fail to be fully heated, affecting the drying effect, and too slow flow rate will prolong the drying time.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solution; comprising a drying chamber, a hot air system, a first cyclone separator, a second cyclone separator, an exhaust system and an air compressor, wherein the hot air system comprises a hot air blower and a hot air main duct, and the exhaust system comprises an exhaust blower and an exhaust main duct; the first cyclone separator and the second cyclone separator have the same structure, both comprising a main body, an air inlet and an air outlet;

[0007] The drying bin comprises a cylindrical cavity at the top and a conical cavity at the bottom, a flow dryer is fixedly connected in the cylindrical cavity, the flow dryer comprises a plurality of equidistantly arranged annular baffles, each of which is provided with a discharge port, the upper ends of the plurality of annular baffles are integrally connected with an upper sealing plate, the lower ends of the plurality of annular baffles are integrally connected with a porous plate, an air outlet is provided below the porous plate, the air outlet is communicated with the hot air main duct, an annular leakage channel is formed between the outermost annular baffle and the inner wall of the cylindrical cavity, a feed pipe is provided inside the innermost annular baffle, the feed pipe penetrates upward through the upper sealing plate and is fixedly connected to the drying bin, a first hot air outlet tangent to and communicated with the side of the cylindrical cavity is provided on the side of the drying bin, The first hot air outlet is below the flow dryer and connected to the hot air main duct, the lower end of the conical cavity is connected to the first discharge channel, the end of the first discharge channel away from the drying bin is connected to the air inlet of the first cyclone separator, a return pipe is provided on the inner center axis of the conical cavity, the return pipe is connected to a horizontally arranged second discharge channel above, the second discharge channel passes through the side of the drying bin and is connected to the air inlet of the second cyclone separator, the lower end of the second cyclone separator is connected to a connecting pipe, the other end of the connecting pipe is connected to the first discharge channel, the air outlets of the first cyclone separator and the second cyclone separator are both connected to the exhaust main duct, and the lower end of the first cyclone separator is connected to the discharger.

[0008] Preferably, the upper end of the feed pipe is connected to a heating bin, and the heating bin includes a screening portion and a conical aggregate portion from top to bottom. The screening portion is rotatably connected to a cylindrical screen, and a nozzle is provided inside the cylindrical screen. The nozzle is fixedly connected to the heating bin, and the left end of the nozzle penetrates through the inner cavity of the cylindrical screen to the left, and the right end of the nozzle penetrates through the outside of the cylindrical screen to the right. The screening portion is connected to a suction port, and the suction port is above the cylindrical screen and connected to the exhaust main duct. The side of the aggregate portion is connected to a second hot air outlet tangent to the side of the aggregate portion.

[0009] Preferably, a plurality of groups of material copying assemblies are provided on the inner cavity side of the cylindrical screen, each group of material copying assemblies includes a plurality of L-shaped copying plates evenly distributed in a circumference, the bending angle of the L-shaped copying plates is 120°-150°, and every two adjacent groups of material copying assemblies are staggered.

[0010] Preferably, a turbofan is rotatably connected inside the feed pipe.

[0011] Preferably, a rugby-shaped disturbing body is fixedly connected between the lower end of the feed pipe and the porous plate, and a feed space is provided between the disturbing body and the lower end outlet of the feed pipe.

[0012] Preferably, the left end of the cylindrical screen is fixedly connected to a first rotating shaft, the right end of the cylindrical screen is fixedly connected to a second rotating shaft, the first rotating shaft and the second rotating shaft are coaxially arranged, the nozzle passes through the second rotating shaft and is coaxially arranged with the second rotating shaft, and the first rotating shaft and the second rotating shaft are at positions deviated from the central axis of the cylindrical screen.

[0013] Preferably, it also includes a mixing cylinder and a suction pump, a suction pipeline is connected between the mixing cylinder and the suction pump, a feeding pipeline is also connected to the suction pump, the right end of the nozzle is connected to a Venturi tube, the Venturi tube includes an air inlet channel, an air outlet channel and a mixing chamber, the mixing chamber is connected to the feeding pipeline, and the air outlet end of the air compressor is connected to the air inlet channel.

[0014] Preferably, the second discharge channel is a second Venturi tube, which includes an air inlet channel, an air outlet channel and a negative pressure chamber, the negative pressure chamber is connected to the return pipe, the air outlet channel is connected to the second cyclone separator, and the air inlet channel is connected to the air outlet end of the air compressor.

[0015] Preferably, each annular partition is provided with two discharge ports, and the two discharge ports are arranged in a colinear manner, and the discharge ports between every two adjacent annular partitions are arranged staggered at 90 degrees.

[0016] Preferably, two of the first cyclone separators and two of the second cyclone separators are provided, the first discharge channel is communicated with the air inlets of the two first cyclone separators, and the second discharge channel is communicated with the air inlets of the two second cyclone separators.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Improve drying efficiency and quality: By setting up a flow dryer, the micro powder is kept in a suspended state during the drying process to avoid micro powder agglomeration. The hot air is fully in contact with the micro powder to improve the drying efficiency. The air flow design in the drying chamber helps to evenly distribute the micro powder to ensure more thorough drying.

[0019] 2. Optimize separation effect: The use of cyclone separator effectively separates micro powder and air, and improves the purity of the product. The structure similar to cyclone separator composed of drying chamber, hot air outlet, return pipe, etc., combined with the design of Venturi tube of the second discharge channel, further separates micro powders of different qualities, disperses the amount of micro powder, and improves the uniformity and drying efficiency of the product.

[0020] 3. Enhance the fluidity and dispersibility of micro powders: The annular partition, discharge port design and material-scraping components in the flow dryer slow down the flow rate of the micro powders, while enhancing the fluidity and dispersibility of the micro powders, which is conducive to the full contact between hot air and micro powders. The cylindrical screen and material-scraping components in the heating bin are also conducive to the uniform dispersion and preheating of the micro powders, so that the drying temperature does not need to be too high and an excellent drying effect can be achieved.

[0021] 4. Improve system flexibility and processing capacity: multiple parallel cyclone separators are set up to improve the system's processing capacity and make it suitable for large-scale micro-processing. Turbofans, turbulent bodies and other designs optimize the feeding and dispersion process of micro-powders and improve the flexibility of the system.

[0022] 5. Ensure the characteristics of micro powder: During the entire drying and separation process, the micro powder is in a flowing state, avoiding decomposition, oxidation or other chemical reactions of the modified layer, thus ensuring the characteristics of the micro powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is the overall structure front view of the present invention.

[0025] Figure 2 It is a three-dimensional diagram of the overall structure of the present invention.

[0026] Figure 3 It is a schematic diagram of the overall structure of the first drying of small droplets sprayed from the nozzle in the heating chamber of the present invention.

[0027] Figure 4 It is a schematic diagram of the overall structure of the micro powder in the heating bin entering the fluidized dryer for secondary drying in the present invention.

[0028] Figure 5 yes Figure 3 A magnified schematic diagram of part A in FIG.

[0029] Figure 6 It is a left view of the overall structure of the turbofan in the present invention.

[0030] Figure 7 It is a structure for separating and drying the fine powder in the drying bin of the present invention.

[0031] Figure 8 It is a structural schematic diagram of the positional relationship between the cylindrical screen and the first rotating shaft and the second rotating shaft in the present invention.

[0032] Fig. 9 It is a three-dimensional diagram of the overall structure of the cylindrical screen of the present invention after longitudinal sectioning.

[0033] Fig.10 It is a right view of the overall structure of the cylindrical screen of the present invention after longitudinal sectioning.

[0034] Fig.11 yes Fig.10 An enlarged schematic diagram of part B in FIG.

[0035] Fig.12 It is a schematic diagram of the overall structure in which the air outlet device and the flow dryer are separated in the present invention.

[0036] In the figure: 1-drying bin, 101-cylindrical cavity, 102-conical cavity, 2-first cyclone separator, 3-second cyclone separator, 4-hot air blower, 5-hot air main duct, 6-exhaust fan, 7-exhaust main duct, 8-circular partition, 9-discharge port, 10-upper sealing plate, 11-porous plate, 12-discharger, 13-annular leakage channel, 14-feeding pipe, 15-first hot air port, 16-first discharge channel, 17-return pipe, 18-second discharge channel, 19-connecting pipe, 20-discharger , 21-heating bin, 2101-screening part, 2102-aggregating part, 22-cylinder screen, 23-nozzle, 24-suction port, 25-second hot air outlet, 26-L-type lifting plate, 27-turbofan, 28-turbulent body, 29-feeding space, 30-first rotating shaft, 31-second rotating shaft, 32-mixing barrel, 33-suction pump, 34-suction pipeline, 35-feeding pipeline, 36-Venturi tube, 3601-inlet channel, 3602-outlet channel, 3603-mixing chamber, 37-air compressor. DETAILED DESCRIPTION

[0037] The present invention will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and thus only show the components related to the present invention.

[0038] Example 1: Reference Figure 1-12 As shown, the present invention includes a drying chamber 1, a hot air system, a first cyclone separator 2, a second cyclone separator 3, an exhaust system and an air compressor 37, wherein the hot air system includes a hot air blower 4 and a hot air main duct 5, and the exhaust system includes an exhaust fan 6 and an exhaust main duct 7; the first cyclone separator 2 and the second cyclone separator 3 have the same structure, both including a main body, an air inlet and an air outlet;

[0039] The drying bin 1 is a main drying body for the micro powder, and is used to contain the dried micro powder. The hot air blower 4 provides hot air, which is transported to the drying bin 1, the first cyclone separator 2 and the second cyclone separator 3 through the hot air main duct 5 to dry the micro powder.

[0040] The cyclone separator is used to separate micro powder and air. The micro powder enters from the air inlet and is separated inside the separator due to the centrifugal force, while the air is discharged from the air outlet.

[0041] The exhaust fan 6 is used to extract the air in the first cyclone separator 2 and the second cyclone separator 3 and discharge it through the exhaust main duct 7.

[0042] The drying bin 1 includes a cylindrical cavity 101 at the top and a conical cavity 102 at the bottom. A flow dryer is fixedly connected in the cylindrical cavity 101. The flow dryer includes a plurality of equidistantly arranged annular baffles 8, each of which is provided with a discharge port 9. An upper sealing plate 10 is integrally connected to the upper ends of the plurality of annular baffles 8, and a porous plate 11 is integrally connected to the lower ends of the plurality of annular baffles 8. An air outlet 12 is provided below the porous plate 11, and the air outlet 12 is communicated with the hot air main duct 5. An annular leakage channel 13 is formed between the outermost annular baffle 8 and the inner wall of the cylindrical cavity 101. A feed pipe 14 is provided inside the innermost annular baffle 8, and the feed pipe 14 penetrates upward through the upper sealing plate 10 and is fixedly connected to the drying bin 1. The side of the drying bin 1 is provided with a first hot air outlet 12 which is tangent to the side of the cylindrical cavity 101 and communicates with the first hot air outlet 12. The conical cavity 102 has a first discharge channel 16 connected to the bottom of the conical cavity 102, and the end of the first discharge channel 16 away from the drying bin 1 is connected to the air inlet of the first cyclone separator 2. A return pipe 17 is provided on the inner center axis of the conical cavity 102. The return pipe 17 is connected to a horizontally arranged second discharge channel 18 above the return pipe 17. The second discharge channel 18 passes through the side of the drying bin 1 and is connected to the air inlet of the second cyclone separator 3. The lower end of the second cyclone separator 3 is connected to a connecting pipe 19, and the other end of the connecting pipe 19 is connected to the first discharge channel 16. The air outlets of the first cyclone separator 2 and the second cyclone separator 3 are both connected to the exhaust main duct 7. The lower end of the first cyclone separator 3 is connected to a discharger 20.

[0043] During drying, flowing hot air is first introduced into the interior of the drying chamber 1 through the air outlet 12 and the first hot air outlet 15, and the temperature of the hot air reaches 80-100°C. In the past, the drying temperature was relatively high, generally 100-200°C. After the temperature in the drying chamber 1 is constant at 80-100°C, the powder to be dried enters the flow dryer through the feed pipe 14 for drying. The powder first enters the area surrounded by the innermost circular partition 8. Multiple equidistant annular partitions 8 can slow down the flow rate of the powder. When the powder enters the area surrounded by the circular partition 8, the air outlet The hot air blown out of the dryer 12 enters the area formed by the annular partition 8 through the porous plate 11, so that the powder is suspended and presents a state similar to boiling. The upper sealing plate 10 ensures that the powder 10 can only flow out through the side discharge port 9 of the annular partition 8, which plays a role in slowing down the flow speed of the powder. The hot air blown into the drying bin 1 is sucked by the exhaust system, and the air flow in the drying bin 1 tends to move downward, so the powder in the boiling state in the flow dryer will continuously flow out through the discharge port 9, and finally the powder flowing out of the flow dryer will fall into the conical cavity 102 through the annular leakage channel 13.

[0044] The drying bin 1, the first hot air outlet 15, the return pipe 17, and the second discharge channel 18 form a structure similar to a cyclone separator. When the powder falls to the first hot air outlet 15, the powder moves downward in a spiral under the drive of the hot air, so that a negative pressure zone is formed on the central axis of the conical container 102, so that the powder is separated from the air. After separation, the powder with a larger mass enters the first discharge channel 16, and the powder with a lighter mass and the air are mixed and enter the second discharge channel 18 through the return pipe 17. The powder in the second discharge channel 18 enters the second cyclone separator 3 for separation of the powder and the air. At this time, the separated powder enters the first discharge pipe 16 through the connecting pipe 19. Finally, the powder in the first discharge pipe 16 enters the first cyclone separator 2 for separation, and the dried powder is discharged from the discharger 20. In addition, the connecting pipe 19 may also be disconnected from the first discharge pipe 16, and the powder in the second cyclone separator 3 may be discharged from the connecting pipe 19 alone.

[0045] In this process, the micropowder is dried by the flow dryer, so that the micropowder is in a suspended state, the micropowder is prevented from agglomerating, the hot air can fully contact the micropowder, and the flow speed of the micropowder can be slowed down, and the drying is more thorough. After the micropowder enters the drying chamber 1, the light and heavy micropowders can be separated and dried again. In the whole process, the micropowder is in a flowing state, which not only ensures the characteristics of the modified micropowder and avoids decomposition, oxidation or other chemical reactions of the modified layer, but also makes the surface of the micropowder dry and solidify more evenly, and there will be no local excessive or insufficient modification.

[0046] Embodiment 2: Based on Embodiment 1, Figure 3 , Figure 4As shown, the upper end of the feed pipe 14 is connected to a heating bin 21, and the heating bin 21 includes a screening portion 2101 and a conical collecting portion 2102 from top to bottom. The screening portion 2101 is rotatably connected to a cylindrical screen 22, and a nozzle 23 is provided inside the cylindrical screen 22. The nozzle 23 is fixedly connected to the heating bin 21, and the left end of the nozzle 23 penetrates the inner cavity of the cylindrical screen 22 to the left, and the right end of the nozzle 23 penetrates to the right to the outside of the cylindrical screen 22. The screening portion 2101 is connected to a suction port 24, and the suction port 24 is above the cylindrical screen 22 and connected to the exhaust main duct 7. The side of the collecting portion 2102 is connected to a second hot air port 25 tangent to the side of the collecting portion 2102.

[0047] The heating chamber 21 is divided into a screening portion 2101 and a conical collecting portion 2102 from top to bottom. The screening portion 2101 is used to evacuate and preliminarily dry the fine powder, and the collecting portion 2102 is used to collect the preheated fine powder and introduce it into the feed pipe 14.

[0048] The cylindrical screen 22 is a screening device with a hollow structure, which is used for screening or processing micropowders. The cylindrical screen 22 can be bent and welded into a cylindrical shape by a hollow plate. The hollow holes on the cylindrical screen 22 have a larger aperture to ensure that more micropowders can pass through. The micropowders fall from the hollow holes to form a state similar to an hourglass; the micropowders falling from the cylindrical screen 22 enter the gathering part 2102, and the gathering part 2102 is conical, which is convenient for the micropowders to fall together. At the same time, driven by the second hot air outlet 25, the micropowders are separated from the unseparated air, and the moisture can be discharged from the suction port 24 to keep the heating bin dry.

[0049] The nozzle 23 is fixed in the heating bin 21, with the left end passing through the inner cavity of the cylindrical screen 22 to the left, and the right end passing through the outside of the cylindrical screen to the right. The nozzle 23 is used to spray the undried micro-powder into the heating bin 1. The nozzle 23 is provided with multiple groups of nozzles evenly distributed along its axial direction, and each group of nozzles is provided with multiple nozzles evenly distributed around the circumference, which can ensure that the micro-powder is sprayed more evenly and contacts with the hot air more fully.

[0050] Embodiment 3: Based on Embodiment 2, Figure 9-11 As shown, a plurality of groups of material copying assemblies are provided on the inner cavity side of the cylindrical screen 22, each group of material copying assemblies includes a plurality of L-shaped copying plates 26 evenly distributed in a circumference, the bending angle of the L-shaped copying plates 26 is 120°-150°, and each two adjacent groups of material copying assemblies are staggered.

[0051] On the inner wall of the cylindrical screen 22, there are installed a plurality of groups of material-lifting components for turning or pushing the powder. The purpose of these components is to help the powder to be better distributed and moved during the falling process, thereby improving the falling efficiency, avoiding the phenomenon of the powder agglomeration in a static state, and making the powder heated more evenly; each group of material-lifting components is composed of a plurality of L-shaped lifting plates 26, which are evenly distributed in the circumferential direction. This design can ensure that the powder is subjected to uniform force during the screening process, avoiding local accumulation or excessive wear; the bending angle of the L-shaped lifting plate 26 is The bending angle of the L-shaped copying plate 26 refers to the angle between the right-angle part and the horizontal part. The design of this angle range can optimize the flow and turning effect of the micro-powder during the screening process, and will not cause excessive accumulation of the micro-powder, nor will the micro-powder be excessively thrown away due to excessive angles; the L-shaped copying plates in two adjacent groups of copying components are not directly aligned, but have a certain offset. This staggered arrangement can further enhance the turning and flow effect of the micro-powder during the screening process, and improve the uniformity and efficiency of the dispersion and flow of the micro-powder.

[0052] Embodiment 4: Based on Embodiment 1, Figure 6 As shown, the feed pipe 14 is internally connected to a turbofan 27 for rotation. The turbofan 27 in the present design is a rotating assembly with fan blades, which is used to generate airflow or stir the micropowder in the feed pipe 14; in addition, the turbofan 27 is preferably driven by a motor, so that the rotation of the turbofan 27 can also generate airflow, which is helpful for the transportation and drying of the micropowder.

[0053] Embodiment 5: Based on Embodiment 1, Figure 3 As shown, a rugby-shaped disturbing body 28 is fixedly connected between the lower end of the feed pipe 14 and the porous plate 11 , and a feed space 29 is provided between the disturbing body 28 and the lower end outlet of the feed pipe 14 .

[0054] The turbulent body 28 is used to change the flow state of the fluid. The turbulent body is designed to be in the shape of an American football. This shape helps the micro-powder to produce a better dispersion effect when it flows and falls, so that the micro-powder entering the flow dryer can be more dispersed and contacted with the hot air. In addition, the turbulent body 28 blocks the hot air discharged upward from the air outlet 12 from entering the feed pipe 14, affecting the discharge of the micro-powder. At the same time, when the upward hot air passes through the turbulent body 28, negative pressure and eddy currents are formed in the feed space 29, so that the micro-powder discharged from the feed pipe 14 can enter the flow dryer more quickly and evenly, avoiding blockage or accumulation.

[0055] Embodiment 6: Based on Embodiment 2, Figure 8As shown, in order to disperse the fine powder in the cylindrical screen 22 and avoid accumulation and agglomeration, the left end of the cylindrical screen 22 is fixedly connected to the first rotating shaft 30, and the right end of the cylindrical screen 22 is fixedly connected to the second rotating shaft 31, the first rotating shaft 30 and the second rotating shaft 31 are coaxially arranged, the nozzle 23 passes through the second rotating shaft 31 and is coaxially arranged with the second rotating shaft 31, and the first rotating shaft 30 and the second rotating shaft 31 are at a position deviated from the central axis of the cylindrical screen 22.

[0056] When the first rotating shaft 30 and the second rotating shaft 31 are coaxially arranged and are located on the central axis of the cylindrical screen 22, the powder in the cylindrical screen 22 is always at the bottom of the cylindrical screen 22, which makes it easy for the powder to accumulate; when the first rotating shaft 30 and the second rotating shaft 31 are coaxially arranged and deviate from the central axis of the cylindrical screen 22, the powder is in the cylindrical screen 22. When the cylindrical screen 22 rotates, due to inertia, the powder can be brought to a position deviating from the bottom of the cylindrical screen 22, and then the powder moves downward, thereby improving the dispersibility of the powder.

[0057] Embodiment 7: Based on Embodiment 1, Figure 1 As shown, it also includes a mixing cylinder 32 and a suction pump 33. A suction pipeline 34 is connected between the mixing cylinder 32 and the suction pump 33. The suction pump 33 is also connected to a feeding pipeline 35. The right end of the nozzle 23 is connected to a venturi tube 36. The venturi tube 36 includes an air inlet channel 3601, an air outlet channel 3602 and a mixing chamber 3603. The mixing chamber 3603 is connected to the feeding pipeline 35. The air outlet end of the air compressor 37 is connected to the air inlet channel 3601.

[0058] The mixing barrel 32 is used to pre-mix the micropowder, that is, mix the diamond micropowder with water, because after the surface modification of the diamond micropowder, it can be stably dispersed in the system, ensuring that the micropowder reaches the required uniformity before entering the screening or processing process, and it is more convenient for the micropowder to be uniformly sprayed and dried; the suction pump 33 extracts the micropowder from the mixing barrel 32 through the suction pipeline 34, and transports it to the venturi tube 36 through the feeding pipeline 35. The venturi tube 36 is used for mixing fluids, wherein the air inlet channel 3601 is used to introduce external gas, such as air, and the micropowder and gas are mixed in the mixing chamber 3603 here, and the mixed fluid flows out from the air outlet channel 3602; in the venturi tube 36, the gas and the micropowder are mixed in the mixing chamber. The design of the venturi tube uses the negative pressure generated by the change in flow rate to inhale and mix the micropowder and the gas, and the mixed fluid (micropowder and gas) is sprayed into the cylindrical screen 22 through the nozzle 23.

[0059] Embodiment 8: Based on Embodiment 1, Figure 4As shown, the second discharge channel 18 is a second Venturi tube, which includes an air inlet channel 1801, an air outlet channel 1802 and a negative pressure chamber 1803. The negative pressure chamber 1803 is connected to the return pipe 17, the air outlet channel 1802 is connected to the second cyclone separator 3, and the air inlet channel 1801 is connected to the air outlet end of the air compressor 37.

[0060] The air inlet channel 1801 is the entrance of the second venturi tube, which is used to introduce external gas. In this system, the air inlet channel 1801 is connected to the air outlet end of the air compressor 37, and the gas provided by the air compressor enters the venturi tube; the air outlet channel 1802 is the outlet of the second venturi tube, and the mixed fluid (gas and micro-powder particles) flows out from here. In this system, the air outlet channel is connected to the second cyclone separator 3, and the mixed fluid enters the second cyclone separator 3 for further separation and treatment; the negative pressure chamber 1803 is a key area in the venturi tube. Due to the change in flow rate, negative pressure will be generated here. In this system, the negative pressure chamber is connected to the return pipe 17. The negative pressure can attract lighter micro-powder particles from the return pipe 17 into the venturi tube, thereby realizing the mixing of micro-powder and gas, dispersing the total amount of micro-powder, and achieving better drying effect.

[0061] Embodiment 9: Based on Embodiment 1, Fig.12 As shown, there are two discharge ports 9 on each annular partition plate 8, and the two discharge ports 9 are arranged in a colinear manner, and the discharge ports 9 between every two adjacent annular partition plates 8 are arranged staggered at 90 degrees.

[0062] The annular baffles 8 are used to separate and guide the flow of micro-powders. The discharge ports 9 between every two adjacent annular baffles 8 are staggered at 90 degrees. This layout ensures that the flow direction of the micro-powders will change significantly when flowing from one annular baffle to the next. This change helps to slow down the flow speed of the micro-powders, enhance the drying effect of the micro-powders, and improve the processing efficiency.

[0063] Embodiment 10: Based on Embodiment 1, Figure 7 As shown, two of the first cyclone separators 2 and the second cyclone separators 3 are provided, the first discharge channel 16 is communicated with the air inlets of the two first cyclone separators 2 , and the second discharge channel 18 is communicated with the air inlets of the two second cyclone separators 3 .

[0064] The first cyclone separator 2 and the second cyclone separator 3 are both provided with two parallel ones, which are used together to process micro powders. The parallel design can improve the processing capacity and ensure that the system can meet the larger micro powder processing needs. Due to the existence of two parallel cyclone separator groups, it has higher flexibility and can adjust the micro powder processing flow according to actual needs. It is suitable for the need to process a large amount of micro powders or require more refined separation.

[0065] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flow drying device for surface modification of ultrafine diamond powder, comprising a drying chamber (1), a hot air system, a first cyclone separator (2), a second cyclone separator (3), an exhaust system and an air compressor (37), wherein the hot air system comprises a hot air blower (4) and a hot air main duct (5), and the exhaust system comprises an exhaust blower (6) and an exhaust main duct (7); the first cyclone separator (2) and the second cyclone separator (3) have the same structure, both comprising a main body, an air inlet and an air outlet; It is characterized in that The drying chamber (1) comprises a cylindrical cavity (101) at the top and a conical cavity (102) at the bottom. A flow dryer is fixedly connected in the cylindrical cavity (101). The flow dryer comprises a plurality of equidistantly arranged annular baffles (8). Each annular baffle (8) is provided with a discharge port (9). The upper ends of the plurality of annular baffles (8) are integrally connected to an upper sealing plate (10). The lower ends of the plurality of annular baffles (8) are integrally connected to a porous plate (11). The porous plate (11) is provided with a plurality of equidistantly arranged annular baffles (8). An air outlet (12) is provided below the drying chamber (1), the air outlet (12) is communicated with the hot air main duct (5), an annular material leakage channel (13) is formed between the outermost annular partition plate (8) and the inner wall of the cylindrical cavity (101), a feed pipe (14) is provided inside the innermost annular partition plate (8), the feed pipe (14) passes through the upper sealing plate (10) upwards and is fixedly connected to the drying chamber (1), and a first hot air outlet (13) is provided on the side of the drying chamber (1) which is tangent to the side of the cylindrical cavity (101) and communicates with the first hot air outlet (13) and the first hot air outlet (13) is provided on the side of the drying chamber (1) The first hot air outlet (15) is located below the flow dryer and is connected to the hot air main duct (5); the lower end of the conical cavity (102) is connected to a first discharge channel (16); the end of the first discharge channel (16) away from the drying bin (1) is connected to the air inlet of the first cyclone separator (2); a return pipe (17) is provided on the inner central axis of the conical cavity (102); the upper part of the return pipe (17) is connected to a second discharge channel (16) arranged horizontally. 18), the second discharge channel (18) passes through the side of the drying bin (1) and is connected to the air inlet of the second cyclone separator (3), the lower end of the second cyclone separator (3) is connected to a connecting pipe (19), the other end of the connecting pipe (19) is connected to the first discharge channel (16), the air outlets of the first cyclone separator (2) and the second cyclone separator (3) are both connected to the exhaust main duct (7), and the lower end of the first cyclone separator (3) is connected to a discharger (20).

2. The fluidized drying device for surface modification of ultrafine diamond powder according to claim 1, characterized in that: The upper end of the feed pipe (14) is connected to a heating bin (21). The heating bin (21) includes a screening portion (2101) and a conical collecting portion (2102) from top to bottom. The screening portion (2101) is rotatably connected to a cylindrical screen (22). A nozzle (23) is provided inside the cylindrical screen (22). The nozzle (23) is fixedly connected to the heating bin (21). The left end of the nozzle (23) passes through the inner cavity of the cylindrical screen (22) to the left, and the right end of the nozzle (23) passes through the outside of the cylindrical screen (22) to the right. The screening portion (2101) is connected to a suction port (24). The suction port (24) is above the cylindrical screen (22) and is connected to the exhaust main duct (7). The side of the collecting portion (2102) is connected to a second hot air port (25) tangent to the side of the collecting portion (2102).

3. The fluidized drying device for surface modification of ultrafine diamond powder according to claim 2, characterized in that: A plurality of groups of material copying assemblies are arranged on the inner cavity side of the cylindrical screen (22), each group of material copying assemblies comprises a plurality of L-shaped copying plates (26) evenly distributed in a circumference, the bending angle of the L-shaped copying plates (26) is 120°-150°, and each two adjacent groups of material copying assemblies are arranged in a staggered manner.

4. The fluidized drying device for surface modification of ultrafine diamond powder according to claim 1, characterized in that: The feed pipe (14) is rotatably connected to a turbofan (27) inside.

5. The fluidized drying device for surface modification of ultrafine diamond powder according to claim 1, characterized in that: A rugby-shaped disturbing body (28) is fixedly connected between the lower end of the feed pipe (14) and the porous plate (11), and a feed space (29) is provided between the disturbing body (28) and the lower end outlet of the feed pipe (14).

6. The fluidized drying device for surface modification of ultrafine diamond powder according to claim 2, characterized in that: The left end of the cylindrical screen (22) is fixedly connected to a first rotating shaft (30), and the right end of the cylindrical screen (22) is fixedly connected to a second rotating shaft (31), the first rotating shaft (30) and the second rotating shaft (31) are coaxially arranged, the nozzle (23) passes through the second rotating shaft (31) and is coaxially arranged with the second rotating shaft (31), and the first rotating shaft (30) and the second rotating shaft (31) are located at positions deviating from the center axis of the cylindrical screen (22).

7. The fluidized drying device for surface modification of ultrafine diamond powder according to claim 2, characterized in that: It also includes a mixing cylinder (32) and a suction pump (33), wherein a suction pipeline (34) is connected between the mixing cylinder (32) and the suction pump (33), and a feeding pipeline (35) is also connected to the suction pump (33). The right end of the nozzle (23) is connected to a venturi tube (36), and the venturi tube (36) includes an air inlet channel (3601), an air outlet channel (3602) and a mixing chamber (3603), wherein the mixing chamber (3603) is connected to the feeding pipeline (35), and the air outlet end of the air compressor (37) is connected to the air inlet channel (3601).

8. The fluidized drying device for surface modification of ultrafine diamond powder according to claim 1, characterized in that: The second discharge channel (18) is a second Venturi tube, which includes an air inlet channel (1801), an air outlet channel (1802) and a negative pressure chamber (1803); the negative pressure chamber (1803) is connected to the return pipe (17); the air outlet channel (1802) is connected to the second cyclone separator (3); and the air inlet channel (1801) is connected to the air outlet end of the air compressor (37).

9. The fluidized drying device for surface modification of ultrafine diamond powder according to claim 2, characterized in that: There are two discharge ports (9) on each annular partition (8), and the two discharge ports (9) are arranged in a colinear manner, and the discharge ports (9) between every two adjacent annular partitions (8) are arranged in a staggered manner at 90 degrees.

10. The fluidized drying device for surface modification of ultrafine diamond powder according to claim 2, characterized in that: Two of the first cyclone separators (2) and the second cyclone separators (3) are provided, the first discharge channel (16) is connected to the air inlets of the two first cyclone separators (2), and the second discharge channel (18) is connected to the air inlets of the two second cyclone separators (3).

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