Airflow mixing coating equipment, system and coating process thereof

Abstract

The present invention discloses an airflow mixing coating device, system and coating process thereof, so as to solve the problem that the traditional coating method has poor coating effect between powder and liquid. The coating device comprises: a feed port at the top of the cylinder for inputting powder; a scraping mechanism comprises a driving component, a hollow rotating shaft and a spiral air knife for scraping powder on the inner wall of the cylinder, one end of the hollow rotating shaft extends into the cylinder, is driven by the driving component to rotate around the axis of the rotating shaft, and is connected to an external gas source through a rotating joint; the spiral air knife is connected to the hollow rotating shaft; the first purge nozzle is connected to the spiral air knife and is used to purge powder; the first fluidizing nozzle is located at the bottom of the cylinder, and uses supersonic carrier gas to atomize the liquid coating agent and spray out the coating agent airflow formed by nano-scale coating particles, and the coating agent airflow fluidizes in the cylinder and coats the powder. The coating system comprises: coating equipment, a coating agent material tank, a metering pump and an air supply device for adjusting the flow rate of the coating agent entering the first fluidizing nozzle.

Description

Technical Field

[0001] The invention relates to the technical field of powder conveying and mixing, and in particular to an airflow mixing coating device, a system and a coating process thereof. Background Art

[0002] At present, the mainstream coating technologies in the lithium battery industry are divided into two categories: dry method and wet method. Among them, the wet coating method fully dissolves and disperses the modified additives in the solvent, and after adding them to the substrate, during the stirring, evaporation / drying or filter pressing process, the modified additives undergo chemical reactions and precipitate on the surface of the substrate to form a coating layer, and then react and solidify through sintering; the dry coating method physically mixes the substrate and the modified additives, and friction and collision occur during the mixing process. The modified additives are evenly dispersed and adsorbed on the surface of the substrate to form a coating layer, and then react and solidify through sintering.

[0003] In the traditional coating method, the fluidizing gas usually uses separate air. The powder is only fluidized by simple compressed air and moves upward from the bottom of the equipment, and the coating agent is sprayed downward at the top of the equipment. The powder and the fluidizing gas meet and collide during the counter-movement process, so that there is surface contact between the coating agent and the stirred powder, that is, when the large cloud formed by the upward diffusion of the powder and the large cloud formed by the downward diffusion of the coating agent collide in relative motion, there is a curved surface contact between the powder and the coating agent, and the coating agent needs to break through the compressed air layer that wraps the powder before it can be attached to the powder particles. The sufficient contact between the powder particles and the coating agent cannot be guaranteed, and the coating effect is poor. Summary of the invention

[0004] The object of the present invention is to provide an airflow mixing coating device, system and coating process thereof, which are used to achieve three-dimensional contact between powder and nano-scale coated particles and improve the coating effect between nano-scale coated particles and powder.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides an airflow mixing and coating device, comprising:

[0007] The cylinder has a feed port and an exhaust port at the top and a discharge port at the bottom. The feed port is used to input powder.

[0008] The scraping mechanism comprises a driving component, a hollow rotating shaft and a spiral air knife, wherein the driving component is arranged on the cylinder, one end of the hollow rotating shaft is connected to the driving end of the driving component, the other end of the hollow rotating shaft extends into the cylinder, the hollow rotating shaft is driven by the driving component to rotate around the axis of the hollow rotating shaft, and the hollow rotating shaft is connected to an external air source through a rotary joint; the spiral air knife is connected to the other end of the hollow rotating shaft, and the spiral air knife is used to scrape the powder attached to the inner wall of the cylinder;

[0009] A first purge nozzle is connected to the spiral air knife and is used to spray purge gas toward the inner wall of the cylinder to purge the powder on the inner wall of the cylinder;

[0010] The first fluidizing nozzle is located at the bottom of the cylinder. The first fluidizing nozzle uses supersonic carrier gas to atomize the liquid coating agent and sprays a coating agent airflow formed by nano-scale coating particles into the cylinder, so that the coating agent airflow fluidizes in the cylinder and coats the powder in the cylinder.

[0011] Optionally, in the above-mentioned airflow mixing and coating equipment, the first fluidizing nozzle comprises:

[0012] The nozzle seat has a compressed air channel inside and a liquid material inlet is opened on the wall of the nozzle seat;

[0013] The nozzle core is sleeved in the nozzle seat, and the nozzle core has a central spray hole and a radial channel, and the radial channel is connected to the central spray hole;

[0014] The valve stem is sleeved in the nozzle seat, and the valve stem has a central channel. The valve stem and the nozzle core, as well as the valve stem and the inner wall of the nozzle seat are sealed by a sealing ring. A liquid channel is formed between the valve stem and the nozzle seat, as well as between the nozzle core and the nozzle seat. The liquid inlet and the radial channel are connected to the liquid channel. The central spray hole of the nozzle core is connected to the central channel of the valve stem to form a gas channel. The gas channel is connected to the compressed air channel, and the gas channel is blocked from the liquid channel. The liquid channel is used to pass a liquid coating agent, and the gas channel is used to pass a carrier gas. The central spray hole is used to form a supersonic carrier gas and use the supersonic carrier gas to atomize the liquid coating agent and then spray out the coating agent airflow formed by nano-scale coating particles.

[0015] Optionally, in the above-mentioned airflow mixing and coating equipment, the nozzle core is made of ceramic.

[0016] Optionally, the above-mentioned airflow mixing coating device further includes a second fluidizing nozzle, which is located at the bottom of the cylinder, and is used to spray the nano-scale solid coating particles into the cylinder, and fluidize and coat the powder in the cylinder, and the second fluidizing nozzle includes:

[0017] The second nozzle seat has a second compressed air passage inside, and a solid material inlet is opened on the wall of the second nozzle seat;

[0018] A second nozzle core is sleeved in the second nozzle seat, and the second nozzle core has a second central spray hole;

[0019] The second valve stem is sleeved in the second nozzle seat, and the second valve stem has a second central channel. The second valve stem and the inner wall of the second nozzle seat are sealed by a second sealing ring. The second central spray hole, the second central channel and the second compressed air channel are connected to form a solid material channel. The solid material inlet is connected to the solid material channel. The solid material inlet is used to connect with a nano-scale solid coated particle source. The second compressed air channel and the solid material channel are used to introduce carrier gas.

[0020] Optionally, the above-mentioned airflow mixing and coating equipment further includes a filtering mechanism, which is connected to the exhaust port of the cylinder and is used to filter the carrier gas and purge gas discharged from the cylinder.

[0021] Optionally, in the above-mentioned airflow mixing and coating device, the filtering mechanism includes:

[0022] At least two filter elements are arranged in the cylinder body and are used to filter the carrier gas and the purge gas discharged from the cylinder body;

[0023] The air chamber is arranged outside the cylinder, each filter element is connected to an air chamber, and the air chamber has an air outlet and a back-blowing inlet, and the air outlet is used to discharge the filtered carrier gas and purge gas;

[0024] Back-blowing air bag, the back-blowing inlet of each air chamber is connected to a corresponding back-blowing air bag, and the back-blowing air bag is used to provide a back-blowing air flow through an external air source;

[0025] Pneumatic ball valve: each air chamber's air outlet is connected to a corresponding pneumatic ball valve, which is used to control the on and off of the back-blowing airflow.

[0026] Optionally, in the above-mentioned airflow mixing and coating device, the filtering mechanism further comprises:

[0027] A fan is connected to the air outlet of each air chamber and is used to suck the carrier gas and the purge gas discharged from the air outlet;

[0028] A pulse valve is arranged between the corresponding connected back-blowing air bag and the air chamber, and the pulse valve is used to adjust the back-blowing pulse time and pulse time interval of the back-blowing air flow into each corresponding filter element;

[0029] A pressure regulating valve is arranged between the back-blowing air bag and the external air source, and is used to adjust the air flow pressure of the back-blowing air flowing into each corresponding filter element;

[0030] The differential pressure transmitter has two ends connected to the cylinder and the air outlet of the air chamber respectively, and the differential pressure transmitter is used to detect the blockage of the filter element.

[0031] Optionally, in the above-mentioned airflow mixing and coating equipment, the first purge nozzle is arranged at the blade edge of the spiral air knife, and the airflow mixing and coating equipment further comprises:

[0032] A second purge nozzle is arranged at the blade end of the spiral air knife, and the purge direction of the second purge nozzle is inclined downward along the circumferential direction of the cylinder;

[0033] The third purge nozzle is arranged on the side wall of the cylinder, and is used for blowing toward the inner wall of the cylinder.

[0034] Optionally, the above-mentioned airflow mixing and coating device further comprises:

[0035] The discharge mechanism is connected with the discharge port of the cylinder, and includes a conical shell, a conical sealing seat and a driving cylinder. The conical sealing seat is coaxially arranged with the discharge port of the cylinder and is used to block the discharge port of the cylinder. The conical shell is sealingly connected with the conical sealing seat. The conical shell is located in the cylinder. The driving cylinder is drivingly connected with the conical shell. The driving cylinder is used to drive the conical sealing seat and the conical shell to move along the axial direction of the cylinder to open and close the discharge port.

[0036] And / or, an air hammer is arranged on the outer wall of the cylinder, and the air hammer is used to strike the outer wall of the cylinder.

[0037] Optionally, in the above-mentioned airflow mixing and coating equipment, the spraying angle range of the first fluidizing nozzle is 30°~80°.

[0038] Compared with the prior art, when the above technical solution is adopted, the operator feeds the powder into the cylinder from the feed port. During this process, the first fluidizing nozzle located at the bottom of the cylinder uses supersonic carrier gas to atomize the liquid coating agent, which can make the liquid coating agent form extremely fine nano-scale coating particles, and spray the nano-scale coating particles into the cylinder, so that the nano-scale coating particles are continuously sprayed upward along the axial direction of the cylinder in the cylinder to form a coating agent airflow. The coating agent airflow drives the powder to move and diffuse in the cylinder, realizes the fluidization of the powder, and makes the nano-scale coating particles and the powder fully mixed. The nano-scale coating particles gradually coat the nearby powder surface to complete the powder coating. At the same time, the external air source introduces the purge gas into the hollow shaft through the rotary joint, and the driving component of the scraping mechanism drives the hollow shaft to rotate, driving the spiral air knife to rotate together. After the purge gas passes through the rotary joint, the hollow shaft and the spiral air knife in turn, it is ejected from the first purge nozzle, forming a spiral airflow in the cylinder to continuously sweep the inner wall of the cylinder to reduce the adhesion of the powder and the coated powder to the inner wall of the cylinder. At the same time, with the rotation of the spiral air knife, the powder with high viscosity that is easy to stick to the wall can be mechanically stirred by the spiral air knife, so that the spiral blades of the spiral air knife have the functions of scraping the wall and pressing the material downward during the rotation process, so as to prevent the powder from forming a non-flowing hanging wall during the mixing and coating process. The wall material layer is formed to ensure that the powder in the wall material layer can also fully participate in the mixed coating. The waste gas after the coating is completed is discharged through the exhaust port of the cylinder. Compared with the traditional coating process in which the coating agent sprayed separately is in surface contact with the powder after stirring, the present application sprays the coating agent airflow formed by the coating agent into the cylinder through the first fluidizing nozzle. The sprayed coating agent airflow fluidizes the powder, so that the powder is surrounded in an all-round and three-dimensional manner in the airflow space full of nano-scale particles. The powder is fluidized and coated in the cylinder, and the coating effect between the nano-scale coating particles and the powder particles is improved, and the uniformity of the coating on the powder surface is ensured to achieve three-dimensional contact between the powder and the nano-scale coating particles. From a microscopic perspective, starting from the coating agent airflow sprayed into the cylinder, the powder particles and the coating agent particles wrapped around them move together as an independent unit in the cylinder, and the coating thickness is continuously uniformed in the friction, collision and convection with other units.

[0039] In a second aspect, the present invention further provides an airflow mixing and coating system, comprising:

[0040] An airflow mixing and coating device as described in any one of the above items;

[0041] A coating agent material tank having a discharge end, the discharge end of the coating agent material tank being connected to the first fluidizing nozzle of the airflow mixing coating device and being used for storing the liquid coating agent;

[0042] A metering pump is disposed at the discharge end of the coating agent tank, and is used to adjust the flow rate of the liquid coating agent passing into the first fluidizing nozzle;

[0043] An air supply device, the air supply device includes a process gas source, the process gas source is connected to the rotary joint, and is used to provide a purge gas to the rotary joint. The process gas source is connected to the first fluidizing nozzle and the second fluidizing nozzle of the airflow mixing and coating device, and is used to provide a carrier gas to the first fluidizing nozzle and the second fluidizing nozzle;

[0044] The first heating mechanism is connected to the first fluidizing nozzle and is used to heat the carrier gas introduced into the first fluidizing nozzle to dry the powder in the cylinder.

[0045] Optionally, in the above-mentioned air flow mixing and covering system, the air supply device also includes an instrument air source, which is respectively connected to the air hammer of the air flow mixing and covering equipment and the driving cylinder of the air flow mixing and covering equipment, and the instrument air source is used to provide power for the air hammer and the driving cylinder.

[0046] Optionally, the above-mentioned airflow mixing coating system further includes a second heating mechanism, which is coated on the outer wall of the coating agent tank and is used to heat the liquid coating agent in the coating agent tank.

[0047] Optionally, the above-mentioned airflow mixing and covering system further includes:

[0048] The weighing device is arranged on the cylinder body and is used for weighing the cylinder body.

[0049] Optionally, the above-mentioned airflow mixing and covering system further includes:

[0050] A spiral feeding mechanism for conveying nano-scale solid coated particles;

[0051] The storage bin is connected to the discharge end of the spiral feeding mechanism, and the discharge end of the storage bin is connected to the solid material inlet of the second fluidizing nozzle. The storage bin is used to store nano-scale solid coated particles. The process gas source sprays the nano-scale solid coated particles introduced into the solid material inlet into the cylinder through the solid material channel.

[0052] In a third aspect, the present invention further provides an airflow mixing coating process, which is applicable to any of the above-mentioned airflow mixing coating systems, and the airflow mixing coating process comprises:

[0053] S100, heating the coating agent material tank so that the temperature of the liquid coating agent reaches and stabilizes to a first set temperature;

[0054] S200, turning on the first heating mechanism so that the temperature of the carrier gas reaches and stabilizes at a second set temperature;

[0055] S300, start the air supply device and the filter mechanism of the air flow mixing and coating device, adjust the pressure of the carrier gas delivered by the air supply device to the first fluidizing nozzle to the low pressure supply pressure, and input the powder from the feed port of the cylinder so that the input amount of the powder reaches the set weight;

[0056] S400, start the metering pump and the scraping mechanism, adjust the flow rate of the liquid coating agent entering the first fluidizing nozzle through the metering pump, adjust the pressure of the carrier gas delivered by the air supply device to the first fluidizing nozzle to the high-pressure gas supply pressure, so that the carrier gas atomizes the liquid coating agent and sprays nano-scale coating particles into the cylinder to form a coating agent airflow, so that the coating agent airflow fluidizes in the cylinder and covers the surface of the powder; scrape the powder attached to the inner wall of the cylinder through the scraping mechanism, and provide the first purge nozzle with purge gas through the air supply device to purge the powder on the inner wall of the cylinder;

[0057] S500, turn off the metering pump and continue mixing and coating for 20min~60min;

[0058] S600, closing the first heating mechanism, adjusting the pressure of the carrier gas delivered by the gas delivery device to the first fluidizing nozzle to the low-pressure gas supply pressure, and opening the discharge port of the cylinder to complete the discharge;

[0059] S700, turn off the air supply device and the filter mechanism.

[0060] Compared with the prior art, the airflow mixing coating system and airflow mixing coating process provided by the present invention are both suitable for the airflow mixing coating equipment in the above technical scheme to perform coating work, and their beneficial effects are the same as those of the airflow mixing coating equipment in the above technical scheme, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0062] Figure 1 It is a structural schematic diagram of an airflow mixing and coating device provided in an embodiment of the present invention;

[0063] Figure 2 A schematic structural diagram of a first fluidizing nozzle of an airflow mixing and coating device provided in an embodiment of the present invention;

[0064] Figure 3 A schematic structural diagram of a filtering mechanism of an airflow mixing and coating device provided in an embodiment of the present invention;

[0065] Figure 4 for Figure 1 Schematic diagram of the internal structure of the discharge mechanism at A in the middle;

[0066] Figure 5 A schematic diagram of the structure of an airflow mixing and coating system between a solid and a liquid provided in an embodiment of the present invention;

[0067] Figure 6 This is a detection diagram of a material after being coated by an airflow mixing coating system provided in an embodiment of the present invention;

[0068] Figure 7 This is a picture showing the effect of the material after conventional dry coating using existing technology;

[0069] Figure 8 A schematic diagram of the structure of an airflow mixing coating system provided in an embodiment of the present invention when coating between solids;

[0070] Fig. 9 It is a schematic structural diagram of a second fluidizing nozzle of an airflow mixing and coating device provided in an embodiment of the present invention.

[0071] Reference numerals:

[0072] 1-barrel; 11-feeding port; 12-exhaust port; 13-discharging port; 14-third purge nozzle; 15-air hammer; 2-scraping mechanism; 21-driving component; 22-hollow shaft; 23-rotating joint; 24-spiral air knife; 241-first purge nozzle; 242-second purge nozzle; 3-first fluidizing nozzle; 31-nozzle seat; 311-compressed air channel; 312-liquid inlet; 32-nozzle core; 321-central spray hole; 322-radial channel; 33-valve stem; 331-central channel; 34-sealing ring; 35-liquid channel; 36-fluidizing air bag; 4-filter mechanism; 41-filter element; 42-air chamber; 43-back-blowing air bag; 44-pneumatic ball valve; 45-fan; 46-pulse valve; 47-adjustment pressure valve; 48-differential pressure transmitter; 49-drain valve; 5-first heating mechanism; 6-discharging mechanism; 61-conical shell; 62-driving cylinder; 63-conical sealing seat; 7-coating agent tank; 71-metering pump; 72-second heating mechanism; 8-air supply device; 81-process gas source; 811-purge gas; 812-carrier gas; 82-instrument gas source; 91-weighing device; 92-screw feeding mechanism; 93-storage bin; 94-second fluidizing nozzle; 941-second nozzle seat; 9411-second compressed air channel; 9412-solid material inlet; 9413-solid material channel; 942-second nozzle core; 9421-second center spray hole; 943-second valve stem; 9431-second center channel; 944-second sealing ring. DETAILED DESCRIPTION

[0073] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0074] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0075] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0076] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0077] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] like Figure 1-Figure 3 As shown, an airflow mixing and coating device provided by an embodiment of the present invention includes: a barrel 1, a scraping mechanism 2, a first purge nozzle 241 and a first fluidizing nozzle 3.

[0079] The top of the cylinder 1 is provided with a feed port 11 and an exhaust port 12, and the bottom of the cylinder 1 is provided with an exhaust port 13. The feed port 11 is used to input powder; the scraping mechanism 2 includes a driving component 21, a hollow rotating shaft 22 and a spiral air knife 24. The driving component 21 is arranged on the cylinder 1, one end of the hollow rotating shaft 22 is connected to the driving end of the driving component 21, and the other end of the hollow rotating shaft 22 extends into the cylinder 1. The hollow rotating shaft 22 is driven by the driving component 21 to rotate around the axis of the hollow rotating shaft 22, and the hollow rotating shaft 22 is connected to an external air source through a rotary joint 23; the spiral air knife 24 The spiral air knife 24 is connected to the other end of the hollow rotating shaft 22 and is used to scrape the powder attached to the inner wall of the cylinder 1; the first purge nozzle 241 is connected to the spiral air knife 24 and is used to spray purge gas 811 toward the inner wall of the cylinder 1 to purge the powder on the inner wall of the cylinder 1; the first fluidizing nozzle 3 is located at the bottom of the cylinder 1, and the first fluidizing nozzle 3 uses supersonic carrier gas to atomize the liquid coating agent and sprays the coating agent airflow formed by nano-scale coating particles into the interior of the cylinder 1, so that the coating agent airflow is fluidized in the cylinder 1 and coats the powder located in the cylinder 1.

[0080] When implementing it, Figure 1As shown, the operator feeds the powder into the cylinder 1 from the feed port 11. During this process, the first fluidizing nozzle 3 located at the bottom of the cylinder 1 uses supersonic carrier gas to atomize the liquid coating agent. The speed of the supersonic carrier gas can be 380m / s~450m / s. The supersonic carrier gas with ultra-high energy and ultra-strong turbulent pulses can tear the liquid film of the liquid coating agent into filaments. The broken droplets will be further atomized under the strong action of the gas power to form extremely fine nano-scale coated particles, and the nano-scale coated particles are sprayed into the cylinder 1, so that the nano-scale coated particles are continuously sprayed upward along the axial direction of the cylinder 1 in the cylinder 1, forming a coating agent airflow, and the coating agent airflow drives the powder to move and diffuse in the cylinder 1, so that the nano-scale coated particles and the powder are fully mixed, and the nano-scale coated particles are gradually coated on the nearby powder surface to complete the powder coating. At the same time, the external air source introduces the purge gas 811 into the hollow shaft 22 through the rotary joint 23, and the driving component 21 of the scraping mechanism 2 drives the hollow shaft 22 to rotate, driving the spiral air knife 24 to rotate together. The purge gas 811 passes through the rotary joint 23, the hollow shaft 22, and the spiral air knife 24 in sequence, and is ejected from the first purge nozzle 241, forming a spiral airflow in the cylinder 1 to continuously purge the inner wall of the cylinder 1, so as to reduce the adhesion of the powder to the inner wall of the cylinder 1. At the same time, with the rotation of the spiral air knife 24, for the powder with high viscosity that is easy to hang on the wall, the purge gas 811 is used. The spiral air knife 24 performs mechanical stirring in such a way that the spiral blades of the spiral air knife 24 have the functions of scraping the wall and pressing the material downward during the rotation process. The spiral air knife 24 can adopt a double spiral blade, a single spiral blade or a blade structure of other shapes, which can prevent the powder from forming a non-flowing wall material layer during the mixing and coating process, so as to ensure that the powder in the wall material layer can also fully participate in the mixing and coating, so that the powder in the wall material layer can slide downward along the inner wall of the cylinder 1, and the remaining powder is continuously purged and floats in the cylinder 1, and the purging gas 811 and the powder The flow direction of the circulating flow field of the powder in the cylinder 1 is the same, which can promote the circulation of the powder in the cylinder 1, improve the coating rate and coating uniformity of the powder, and because the nano-scale coated particles have a small particle size, when the nano-scale coated particles are continuously diffused in the cylinder 1 under the influence of the purge force of the purge gas 811 and the carrier gas 812, the nano-scale coated particles of the gas gradually coat the surface of the powder near the nano-scale coated particles, and the waste gas after coating is discharged through the exhaust port 12 of the cylinder 1. Compared with the traditional coating agent sprayed separately and the powder after stirring, the coating agent sprayed separately is more convenient to use. In the coating process with surface contact between the bodies, the coating agent airflow containing nano-scale coated particles formed by atomizing the liquid coating agent is sprayed into the cylinder 1 through the first fluidizing nozzle 3, and the sprayed coating agent airflow coats the surfaces of the nearby powder particles, so that the powder is all-roundly and three-dimensionally wrapped in the airflow space filled with diffused nano-scale particles, and the powder is fluidized and coated in the cylinder 1, thereby improving the coating effect between the nano-scale coated particles and the powder particles, ensuring the uniformity of the coating on the powder surface, so as to achieve three-dimensional contact between the powder and the nano-scale coated particles.From a microscopic perspective, starting from the time when the coating agent airflow is sprayed into the cylinder 1, the powder particles and the nano-scale coating particles surrounding the powder move as an independent unit in the cylinder 1, and the coating thickness is continuously uniformed in the process of friction, collision and convection with other units.

[0081] like Figure 1 and Figure 2 As shown, specifically, in this embodiment, the first fluidizing nozzle 3 includes: a nozzle seat 31, a nozzle core 32 and a valve stem 33. The nozzle seat 31 has an air pressure channel 311 inside, and a liquid material inlet 312 is opened on the wall of the nozzle seat 31. The nozzle core 32 is sleeved in the nozzle seat 31. The nozzle core 32 has a central spray hole 321 and a radial channel 322. The radial channel 322 is connected to the central spray hole 321. The valve stem 33 is sleeved in the nozzle seat 31. The valve stem 33 has a central channel 331. The valve stem 33 and the nozzle core 32 and the valve stem 33 and the inner wall of the nozzle seat 31 are sealed by a sealing ring 34. The valve stem 33 and A liquid material channel 35 is formed between the nozzle seats 31 and between the nozzle core 32 and the nozzle seat 31. The liquid material inlet 312 and the radial channel 322 are both connected to the liquid material channel 35. The central spray hole 321 of the nozzle core 32 is connected to the central channel 331 of the valve stem 33 to form a gas channel. The gas channel is connected to the compressed air channel 311, and the gas channel is blocked from the liquid material channel. The liquid material channel 35 is used to introduce liquid coating agent, and the gas channel is used to introduce carrier gas 812. The central spray hole 321 is used to form a supersonic carrier gas and use the supersonic carrier gas to atomize the liquid coating agent and then spray out the coating agent airflow formed by nano-scale coated particles.

[0082] During operation, the carrier gas 812 flows from one end of the nozzle seat 31 to the gas channel through the compressed air channel 311. At the same time, a liquid coating agent is introduced at the liquid material inlet 312, so that the liquid coating agent flows through the liquid material channel 35 and the radial channel 322 in sequence and then enters the central spray hole 321. The supersonic carrier gas formed by the central spray hole 321 is used to atomize the liquid coating agent at the central spray hole 321 near the nozzle core 32 of the gas channel, so that the liquid coating agent forms nano-scale coated particles, and the nano-scale coated particles are sprayed into the cylinder 1, forming a circulating tumbling coating agent airflow in the cylinder 1, which first moves upward to the highest point and then moves downward to the surrounding areas. Compared with the traditional nozzle that processes the internal integrated structure of the valve body, the nozzle package of the present application The nozzle core 32, valve stem 33 and nozzle seat 31 are divided into two parts. By processing the nozzle core 32 and the valve stem 33 separately, it is convenient to process the flow channel holes inside the valve stem 33 and the nozzle core 32 respectively, so that the structure processing is relatively simple and convenient to install; and the sealing ring 34 is used between the valve stem 33 and the nozzle core 32 and between the valve stem 33 and the inner wall of the nozzle seat 31, so that the gas channel and the liquid channel at the joint surface are blocked, and the gas and the liquid do not affect each other, so that the gas channel and the liquid channel 35 have good sealing, reducing the risk of transmission through the gap at the joint surface. When the gas pressure is higher than the liquid pressure, the liquid coating agent can be smoothly sprayed into the central spray hole 321 without being affected by the gas pressure. When the airflow mixing coating system is applied to the coating work between solid and liquid, the first fluidizing nozzle 3 of solid-liquid coating adopts a Laval atomizing nozzle. Specifically, in this embodiment, the material of the nozzle core 32 is ceramic. Ceramics have the advantages of good wear resistance, high temperature resistance, and corrosion resistance. Compared with the traditional nozzle core 32 made of metal material, the nozzle core 32 in the present application is made of ceramic, which improves the wear resistance of the nozzle core 32 structure and avoids cavitation damage and the generation of metal impurities. Of course, the nozzle core 32 can also use other wear-resistant and corrosion-resistant materials to extend the service life of the nozzle core 32.

[0083] like Figure 8 and Fig. 9As shown, in other embodiments, the airflow mixing and coating device also includes a second fluidizing nozzle 94, which is located at the bottom of the cylinder 1. The second fluidizing nozzle 94 is used to spray nano-scale solid coated particles into the cylinder 1, and fluidize and coat the powder located in the cylinder 1. The second fluidizing nozzle 94 includes: a second nozzle seat 941, a second nozzle core 942 and a second valve stem 943. The second nozzle seat 941 has a second compressed air channel 9411 inside, and a solid material inlet 9412 is opened on the wall of the second nozzle seat 941; the second nozzle core 942 is sleeved in the second nozzle seat 941, and the second nozzle core 942 has a second valve stem 943. Two center spray holes 9421; the second valve stem 943 is sleeved in the second nozzle seat 941, the second valve stem 943 has a second center channel 9431, the second valve stem 943 and the inner wall of the second nozzle seat 941 are sealed by a second sealing ring 944, the second center spray hole 9421, the second center channel 9431 and the second compressed air channel 9411 are connected to form a solid material channel 9413, the solid material inlet 9412 is connected to the solid material channel 9413, the solid material inlet 9412 is used to connect with the nano-scale solid coated particle source, the second compressed air channel 9411 and the solid material channel 9413 are used to introduce the carrier gas 812.

[0084] When the airflow mixing coating equipment needs to perform coating work on solids, the second fluidizing nozzle 94 can be opened to allow the nano-scale solid coating particle source to pass through the solid material inlet 9412 into the solid material channel 9413. At the same time, high-pressure carrier gas 812 is continuously introduced into the solid material channel 9413, so that the carrier gas 812 carries the nano-scale solid coating particles and is ejected from the second nozzle core 942 into the cylinder 1. The ejected nano-scale solid coating particles drive the coated powder in the cylinder 1 to roll upward and fluidize, completing the mixing and coating in friction and collision, which is convenient for operation. Similarly, the second fluidizing nozzle 94 not only provides nano-scale solid coating particles, but also has the function of fluidizing airflow, so that the nano-scale solid coating particles are coated on the powder surface in an all-round and three-dimensional manner, which greatly improves the coating effect.

[0085] like Figure 2 As shown, in some embodiments, the airflow mixing and coating device further includes a fluidizing gas bag 36, and the carrier gas 812 is passed into the compressed air channel 311 inside the nozzle holder 31 through the fluidizing gas bag 36. In this way, the fluidizing gas bag 36 can provide shock absorption and buffering effects, reduce the impact and vibration during the operation of the airflow mixing and coating device, and ensure the adjustment accuracy and stability of the carrier gas 812.

[0086] Specifically, in this embodiment, the airflow mixing and coating device further includes a filtering mechanism 4, which is connected to the exhaust port 12 of the cylinder 1, and is used to filter the carrier gas 812 and the purge gas 811 discharged from the cylinder 1. In this way, the impurities and particulate matter in the carrier gas 812 and the purge gas 811 discharged after mixing in the cylinder 1 can be filtered, and the impurities and particulate matter are prevented from adhering and accumulating at the exhaust port 12 to ensure the normal operation of the device, thereby reducing the maintenance cost of the airflow mixing and coating device caused by blockage and wear, and extending the service life of the airflow mixing and coating device.

[0087] like Figure 3 As shown, specifically, in this embodiment, the filtering mechanism 4 includes: at least two filter elements 41, an air chamber 42, a backblowing air bag 43 and a pneumatic ball valve 44. At least two filter elements 41 are arranged in the cylinder 1, and are used to filter the carrier gas 812 and the purge gas 811 discharged from the cylinder 1. The air chamber 42 is arranged outside the cylinder 1. Each filter element 41 is connected to an air chamber 42. The air chamber 42 has an air outlet and a backblowing inlet. The air outlet is used to discharge the filtered carrier gas 812 and the purge gas 811. The backblowing inlet of each air chamber 42 is connected to a backblowing air bag 43. The backblowing air bag 43 is used to provide a backblowing airflow through an external air source. The air outlet of each air chamber 42 is connected to a pneumatic ball valve 44, and the pneumatic ball valve 44 is used to control the on and off of the backblowing airflow.

[0088] During operation, the operator controls the air intake and exhaust mode of each filter element 41 individually through each corresponding pneumatic ball valve 44, so that the back-blowing airflow can only flow through the filter element 41 and then out of the air outlet. When the filter mechanism 4 is provided with two filter elements 41, and one of the filter elements 41 needs to be back-blown, the pneumatic ball valve 44 for exhausting the filter element 41 is closed, and the pneumatic ball valve 44 for exhausting the other filter element 41 is opened. Then, the only channel for the back-blowing gas can only pass through the filter element 41 and be discharged into the cylinder body 1, and then be discharged through the air outlet of the other filter element 41. When the filtering effect of the filter element 41 on the right side is weakened, the operator can close the pneumatic ball valve 44 for exhausting the filter element 41 on the right side and open the pneumatic ball valve 44 for exhausting the filter element 41 on the right side. The pneumatic ball valve 44 for exhausting the left filter element 41 is opened to continue the filtering work of the whole equipment. Of course, the filtering mechanism 4 can also be provided with three, four, five, etc. Compared with the traditional filtering mechanism 4, most of the back-blowing airflow is directly discharged without passing through the filter element 41, resulting in poor back-blowing effect. In this application, the pneumatic ball valve 44 corresponding to the air outlet of each air chamber 42 is connected to control the on and off of the corresponding back-blowing airflow at the filter element 41 separately, so as to facilitate the timely replacement and adjustment of the back-blowing channel of the filter element 41, and improve the back-blowing effect and filtering efficiency of the filtering mechanism 4 on the airflow mixing coating equipment, so as to ensure the utilization rate and back-blowing effect of each corresponding filter element 41. Among them, since the nano-scale coated particles in the cylinder 1 are nano-scale powders, the filter element 41 can adopt a pleated filter cartridge with high filtering accuracy and large filtering area to ensure the filtering demand for the exhaust gas generated in the cylinder 1. It should be noted that the back-blowing gas flow in the back-blowing gas bag 43, the purge gas 811 in the first purge nozzle 241 and the carrier gas 812 introduced into the first fluidizing nozzle 3 are all provided by the same external gas source.

[0089] like Figure 3 As shown, specifically, in this embodiment, the filtering mechanism 4 also includes: a fan 45, a pulse valve 46, a pressure regulating valve 47 and a differential pressure transmitter 48. The fan 45 is connected to the air outlet of each air chamber 42 and is used to suck the carrier gas 812 and the purge gas 811 discharged from the air outlet. The pulse valve 46 is arranged between the corresponding connected backblowing air bag 43 and the air chamber 42. The pulse valve 46 is used to adjust the backblowing pulse time and pulse time interval of the backblowing air flow entering each corresponding filter element 41. The pressure regulating valve 47 is arranged between the backblowing air bag 43 and the external air source. The pressure regulating valve 47 is used to adjust the air flow pressure of the backblowing air flow entering each corresponding filter element 41. The two ends of the differential pressure transmitter 48 are respectively connected to the cylinder 1 and the air outlet of the air chamber 42. The differential pressure transmitter 48 is used to detect the blockage of the filter element 41.

[0090] When working, the air inlet of the fan 45 is connected with the air outlet of the filter mechanism 4. The fan 45 is used to suck the gas discharged from the filter mechanism 4 to form a slight negative pressure in the cylinder 1, so that the powder in the cylinder 1 will not leak. After the operator manually sets the pressure regulating valve 47 to adjust the air pressure required for the back-blowing air bag 43, he continues to set and adjust the pulse valve 46 on each corresponding filter element 41, so that the back-blowing pulse time and pulse time interval of each filter element 41 passing the back-blowing airflow are the same, and the differential pressure transmitter 48 is turned on. When the filter mechanism 4 is working, the differential pressure transmitter 48 detects the blockage of the filter element 41. When the differential pressure transmitter 48 detects that the filter element 41 is blocked, the operator can change the back-blowing channel of the back-blowing airflow by adjusting the pressure regulating valve 47, the pulse valve 46 and the pneumatic ball valve 44, and replace and clean the blocked filter element 41 in time, which is convenient for operation and improves the flexibility of use of the airflow mixing and coating equipment.

[0091] like Figure 3 As shown, in some embodiments, the filter mechanism 4 further includes a drain valve 49, and each back-blowing air bag 43 is connected and connected with a drain valve 49. When the filter mechanism 4 is working, the drain valve 49 is opened, and when the filter element 41 is switched, the mixture of residual powder and waste gas in the back-blowing air bag 43 can be discharged and collected through the drain valve 49, avoiding pollution to the external environment and ensuring the back-blowing effect of the filter element 41.

[0092] like Figure 1 As shown, specifically, in this embodiment, the first purge nozzle 241 is arranged at the blade edge of the spiral air knife 24, and the airflow mixing and covering device also includes a second purge nozzle 242 and a third purge nozzle 14. The second purge nozzle 242 is arranged at the blade end of the spiral air knife 24, and the purge direction of the second purge nozzle 242 is inclined downward along the circumferential direction of the cylinder 1. The third purge nozzle 14 is arranged on the side wall of the cylinder 1, and the third purge nozzle 14 is used to purge toward the inner wall of the cylinder 1.

[0093] For example, the cylinder 1 has a straight section structure and a conical section structure. The conical section structure facilitates the mixed and coated materials to slide down along the inner wall of the conical section structure to the bottom and be discharged smoothly from the discharge port 13, and the external air source as the purge gas 811 can respectively purge the inner wall of the cylinder 1 through the first purge nozzle 241, the second purge nozzle 242 and the third purge nozzle 14, wherein the first purge nozzle 241 is located at the edge of the blade of the spiral air knife 24. As the spiral air knife 24 rotates, the purge gas 811 generates a spiral flow of airflow in the cylinder 1 to purge the inner wall of the straight section of the cylinder wall. During the continuous movement of the airflow, the powder attached to the inner wall of the straight section of the cylinder 1 is blown off; the second purge nozzle 242 is located at the edge of the spiral air knife 24. At the end of the blade, the blowing direction of the second purge nozzle 242 is inclined downward. As the spiral air knife 24 rotates, the purge gas 811 purges the inner wall of the conical section of the cylinder wall obliquely downward along the circumference. The powder attached to the inner wall of the conical section of the cylinder 1 is blown off during the continuous movement of the airflow; the third purge nozzle 14 can be opened in the conical section of the inner wall of the cylinder 1, or in the straight section of the inner wall of the cylinder 1. The third purge nozzle 14 is inclined downward toward the discharge port 13 to purge the inner wall of the cylinder 1. The first purge nozzle 241, the second purge nozzle 242 and the third purge nozzle 14 can avoid the problem of powder hanging on the wall and not participating in the mixing and coating, thereby ensuring that the circulation of the powder in the cylinder 1 is smoother and achieving sufficient mixing and coating of the powder.

[0094] like Figure 1 and Figure 4 As shown, specifically, in this embodiment, the airflow mixing and coating equipment also includes: a discharge mechanism 6, which is connected to the discharge port 13 of the cylinder 1, and the discharge mechanism 6 includes a conical shell 61, a conical sealing seat 63 and a driving cylinder 62. The conical sealing seat 63 is coaxially arranged with the discharge port of the cylinder 1 and is used to block the discharge port 13 of the cylinder 1. The conical shell 61 and the conical sealing seat 63 are sealed and connected. The conical shell 61 is located in the cylinder 1, and the driving cylinder 62 is drivingly connected to the conical shell 61. The driving cylinder 62 is used to drive the conical sealing seat 63 and the conical shell 61 to move along the axial direction of the cylinder 1 to open and close the discharge port 13; and / or, the airflow mixing and coating equipment also includes: an air hammer 15, which is arranged on the outer wall of the cylinder 1 and is used to knock the outer wall of the cylinder 1.

[0095] During operation, the conical shell 61 located at the bottom of the cylinder 1 has an outer structure that conforms to the direction of the material and airflow inside the cylinder 1, which is beneficial to the flow field distribution inside the cylinder 1. At the same time, the cylinder 62 is driven to drive the conical sealing seat 63 and the conical shell 61 to move along the axial direction of the cylinder 1. The conical shell 61 located in the cylinder 1 has an arch-breaking function, which can prevent the problem of material bridging and poor discharge during discharge during movement. The material flows as a "whole flow" through the outer surface of the conical shell 61 to prevent the segregation of material components after mixing, making the circulation of the material smoother and facilitating the rapid collection of the mixed and coated material from the discharge port 13. In addition, the operator can start the air hammer 15 to continuously knock on the outer wall of the cylinder 1 to reduce the problem of material sticking to the inner wall of the cylinder 1.

[0096] like Figure 1 As shown, specifically, in this embodiment, the particle size of the nano-scale coated particles sprayed by the first fluidizing nozzle 3 is nano-scale, which improves the uniformity of the nano-scale coated particles covering the surface of the powder. The spray angle range of the first fluidizing nozzle 3 is 30°~80°. The spray angle range α of the first fluidizing nozzle 3 can be 30°, 45°, 60°, 80°, etc. The spray angle range α of the first fluidizing nozzle 3 is greater than or equal to 30°, so that the coating agent airflow can be sprayed more evenly to improve the mixing and coating efficiency of the airflow mixing and coating device; the spray angle range α of the first fluidizing nozzle 3 is less than or equal to 80°, which avoids part of the airflow of the coating agent being blocked by the inner wall of the cylinder when the coating agent airflow is sprayed, and can make the coating agent airflow rise from the center of the cylinder more concentratedly and fall from the edge of the cylinder, so as to ensure the flow stability and tumbling strength of the coating agent airflow flow field to ensure the uniformity of coating the nano-scale particles on the surface of the powder.

[0097] At the same time, the present invention also provides an airflow mixing coating system, comprising: an airflow mixing coating device as described above, a coating agent material tank 7, a metering pump 71, an air delivery device 8 and a first heating mechanism 5;

[0098] Among them, the coating agent tank 7 has a discharge end, and the discharge end of the coating agent tank 7 is connected to the first fluidizing nozzle 3 of the airflow mixing coating equipment, and is used to store the liquid coating agent; the metering pump 71 is arranged at the discharge end of the coating agent tank 7, and the metering pump 71 is used to adjust the flow rate of the liquid coating agent passed into the first fluidizing nozzle 3; the air supply device 8 includes a process gas source 81, the process gas source 81 is connected to the rotary joint 23, and is used to provide a purge gas 811 to the rotary joint 23, and the process gas source 81 is connected to the first fluidizing nozzle 3, and is used to provide a carrier gas 812 to the first fluidizing nozzle 3; the first heating mechanism 5 is connected to the first fluidizing nozzle 3, and the first heating mechanism 5 is used to heat the carrier gas 812 passed into the first fluidizing nozzle 3 to dry the powder.

[0099] When implementing it, Figure 5As shown, the operator introduces the liquid coating agent into the coating agent material tank 7, and after adjusting the flow rate of the liquid coating agent introduced into the first fluidizing nozzle 3 by the metering pump 71, the powder is introduced into the feed port 11 of the cylinder 1, and the air supply device 8 is started at the same time, so that the purge gas 811 in the process gas source 81 passes through the rotary joint 23, the hollow shaft 22, and the spiral air knife 24 in sequence, and then is sprayed out from the first purge nozzle 241, and the powder is continuously purged and floats in the cylinder 1. At the same time, the carrier gas 812 in the process gas source 81 is introduced into the first fluidizing nozzle 3 located at the bottom of the cylinder 1, and the liquid coating agent is atomized by the supersonic carrier gas and nano-scale coated particles are sprayed out from the inside of the cylinder 1. Particles, so that the nano-scale coated particles are continuously ejected upward along the axial direction of the cylinder 1 in the cylinder 1. In the process of continuous diffusion in the cylinder 1 under the influence of the purge force of the purge gas 811 and the carrier gas 812, the coating agent airflow formed by the nano-scale coated particles and the powder are fully mixed, and the nano-scale coated particles are gradually coated on the surface of the powder particles near the nano-scale coated particles. The waste gas after the coating is completed is discharged through the exhaust port 12 of the cylinder 1, wherein the mixed waste gas after the process gas source 81 is passed into the cylinder 1 can be filtered by the filtering mechanism 4 in the airflow mixing coating equipment and then recycled for secondary use, so as to reduce the use cost of the airflow mixing coating system. Among them, the first heating mechanism 5 can be an air heater, a heating resistor or other structure with a heating function. The first heating mechanism 5 is not limited to the situations listed in this embodiment. When working, the first heating mechanism 5 heats up and heats the carrier gas 812 introduced into the first fluidizing nozzle 3. The heated carrier gas 812 is introduced through the compressed air channel 311 of the first fluidizing nozzle 3, and the supersonic carrier gas heated at the central nozzle hole 321 of the nozzle core 32 atomizes the liquid coating agent, so that the liquid coating agent forms extremely fine nano-scale coating particles. The nano-scale coating particles act as fluidizing gas to drive the powder to continuously rise, tumble and fluidize in a direction parallel to the axis of the cylinder 1. During the tumbling and friction process, the nano-scale coating particles are coated on the powder particles. At the same time as the coating, the high temperature of the coating agent airflow evaporates the moisture in the powder and discharges it from the exhaust port 12 of the cylinder 1, thereby achieving simultaneous coating and drying of the powder, avoiding the agglomeration of the material in the cylinder 1, maintaining the dispersion of the material, and improving the coating effect of the airflow mixing coating equipment. In addition, when the powder inputted from the feed port 11 is anaerobic material or flammable and explosive powder, the purge gas 811 may be nitrogen or other protective gas to ensure the normal and safe operation of the airflow mixing and coating system.

[0100] In some embodiments, the metering pump 71 is a peristaltic pump. The multi-channel output of the peristaltic pump can be connected to the multiple first fluidizing nozzles 3 arranged at the bottom of the barrel 1 of the airflow mixing coating device, and the input flow rate of the liquid coating agent in the dry coating process is small, which is suitable for a peristaltic pump with a small flow rate. At the same time, the liquid coating agent transported by the peristaltic pump has no contact with the inside of the pump body of the peristaltic pump, avoiding the loss and contamination of the liquid coating agent.

[0101] like Figure 5 As shown, specifically, in this embodiment, the air supply device 8 further includes an instrument air source 82, which is respectively connected to the air hammer 15 of the airflow mixing and coating device and the driving cylinder 62 of the airflow mixing and coating device, and the instrument air source 82 is used to provide power for the air hammer 15 and the driving cylinder 62. In this way, the operator can control the movement of the air hammer 15 and the driving cylinder 62 by controlling the gas flow of the instrument air source 82 respectively entering the air hammer 15 and the driving cylinder 62, so as to facilitate adjustment.

[0102] like Figure 5 As shown, specifically, in this embodiment, the airflow mixing coating system further includes a second heating mechanism 72, which is coated on the outer wall of the coating agent tank 7, and is used to heat the liquid coating agent in the coating agent tank 7. According to the different characteristics of the liquid coating agent, the second heating mechanism 72 can use electric heating or other heating methods to heat the outer wall of the coating agent tank 7, and heat the liquid coating agent inside the coating agent tank 7 by heat conduction, so as to reduce the viscosity of the liquid coating agent, improve the effect of the liquid coating agent in forming nano-scale particles, and thus improve the coating effect of the airflow mixing coating system on the powder.

[0103] like Figure 5 As shown, specifically, in this embodiment, the airflow mixing coating system further includes a weighing device 91, which is arranged outside the cylinder 1. The weighing device 91 is used to weigh the entire cylinder 1, and can obtain the weight of the powder added to the cylinder 1 after subtracting the weight of the cylinder 1 itself. Such a configuration is convenient for real-time weighing of the powder in the cylinder 1, and the weight of the powder added to the cylinder 1 is controlled to reach a preset weight according to the weighed weight, so as to avoid excessive accumulation of powder in the cylinder 1, so as to ensure the coating effect and coating uniformity of the powder.

[0104] like Fig. 9 As shown, specifically, in this embodiment, the airflow mixing coating system also includes: a spiral feeding mechanism 92, a storage bin 93 and a second fluidizing nozzle 94, the spiral feeding mechanism 92 is used to convey nano-scale solid coated particles; the storage bin 93 is connected to the discharge end of the spiral feeding mechanism 92, and the discharge end of the storage bin 93 is connected to the solid material inlet 9412 of the second fluidizing nozzle 94, the storage bin 93 is used to store nano-scale solid coated particles, and the process gas source 81 sprays the nano-scale solid coated particles introduced into the solid material inlet 9412 into the cylinder 1 through the solid material channel 9413.

[0105] During operation, the operator adds the nano-scale solid coated particles into the spiral feeding mechanism 92, and transports the nano-scale solid coated particles to the storage bin 93 through the spiral feeding mechanism 92 for storage, and serves as a source of nano-scale solid coated particles input into the second fluidizing nozzle 94, wherein the spiral feeding mechanism 92 includes a driving motor, a rotating shaft, rotating blades and a accommodating chamber, wherein the driving end of the driving motor is connected to the support column driving, and is used to drive the support column to drive the rotating blades to rotate together, so that the nano-scale solid coated particles in the accommodating chamber continuously move from the feed end to the discharge end. When coating work is required, the storage bin 93 is discharged, and the nano-scale solid coated particles are sent to the solid channel 9413 of the second fluidizing nozzle 94 through the solid material inlet 9412 of the second fluidizing nozzle 94. At this time, the carrier gas 812 continuously introduced into the solid channel 9413 blows the nano-scale solid coated particles into the cylinder 1, and completes the coating work between solids and solids with the powder in the cylinder 1, so that the airflow mixing coating system can not only complete the coating work between solids and liquids through the first fluidizing nozzle 3, but also complete the coating work between solids and solids through the second fluidizing nozzle 94. The division of labor of each structure is clear, which improves the scope of application and flexibility of use of the airflow mixing coating system.

[0106] like Figure 6 and Figure 7 As shown, it should be noted that the material after mixed coating is tested by airflow mixing coating equipment, and the test result of transmission electron microscopy shows that the coating thickness is relatively uniform, and the coating thickness is about 5 nanometers, which meets the coating requirements. However, in the prior art, the surface after coating is dotted and the uniformity of the coating thickness is poor.

[0107] In a third aspect, the present invention further provides an airflow mixing coating process, which is applicable to the above-mentioned airflow mixing coating system, and the airflow mixing coating process comprises:

[0108] Step S100, heating the coating agent tank 7 so that the temperature of the liquid coating agent reaches and stabilizes to a first set temperature;

[0109] Among them, the first set temperature can be 40°C~80°C according to the characteristics of the material. For example, the first set temperature is 40°C, 50°C, 75°C or 80°C, etc. By heating to the first set temperature, the viscosity of the liquid coating agent can be reduced, and the gasification effect of the first fluidizing nozzle 3 can be improved to ensure the coating effect of the material after mixing and coating by the airflow mixing and coating device.

[0110] Step S200, turning on the first heating mechanism 5, so that the temperature of the carrier gas 812 reaches and stabilizes to a second set temperature;

[0111] Among them, the second set temperature can be set to 100°C~200°C according to the characteristics of the material. For example, the first set temperature is 100°C, 145°C, 150°C or 200°C, etc. By heating to the second set temperature, the temperature of the hot air sprayed from the first fluidizing nozzle 3 can be increased, and the hot air causes the coating agent airflow to heat up. During tumbling and friction, the liquid material molecules (nanoscale coated particles) in the coating agent airflow are coated on the powder. At the same time, the high temperature of the hot air evaporates and discharges the moisture in the powder, thereby ensuring the drying of the mixed material in the cylinder 1 and improving the coating effect of the material formed in the airflow mixing and coating device.

[0112] Step S300, start the air supply device 8 and the filter mechanism 4 of the air flow mixing and coating device, adjust the pressure of the carrier gas 812 delivered by the air supply device 8 to the first fluidizing nozzle 3 to the low pressure supply pressure, and input the powder from the feed port 11 of the barrel 1, so that the input amount of the powder reaches the set weight;

[0113] In some embodiments, the operator can adjust the air path pressure in the air supply device 8 according to the operating conditions of the first fluidizing nozzle 3, that is, adjust the pressure of the carrier gas 812 delivered by the air supply device 8 to the first fluidizing nozzle 3 to a low-pressure gas supply pressure, which can prevent the powder from backflowing and clogging the first fluidizing nozzle 3. During this process, the filtering mechanism 4 starts working synchronously to continuously filter the purge gas 811 and the carrier gas 812 in the cylinder 1 to prevent the powder from overflowing when adding materials.

[0114] Step S400, start the metering pump 71 and the scraping mechanism 2, adjust the flow rate of the liquid coating agent introduced into the first fluidizing nozzle 3 by the metering pump 71, adjust the pressure of the carrier gas 812 delivered to the first fluidizing nozzle 3 by the air supply device 8 to the high-pressure gas supply pressure, so that the liquid coating agent is mixed with the carrier gas 812 and the nano-scale coated particles are sprayed into the cylinder 1, so that the nano-scale coated particles are fluidized in the cylinder 1 and cover the surface of the powder particles; scrape the powder attached to the inner wall of the cylinder 1 by the scraping mechanism 2, and provide the purge gas 811 to the first purge nozzle 241 by the air supply device 8 to purge the powder on the inner wall of the cylinder 1;

[0115] In some embodiments, the flow rate of the metering pump 71 is set according to the coating ratio of the liquid coating agent on the powder surface, and then the material characteristics are judged during the coating process. When the viscosity of the mixed material is relatively low and it is not easy to adhere to the inner wall of the cylinder 1, there is no need to turn on the scraping mechanism 2; when the viscosity of the mixed material is relatively high and it is easy to adhere to the inner wall of the cylinder 1, the scraping mechanism 2 is turned on after the mixing and coating, and the spiral air knife 24 is used to stir, blow and press the material in the cylinder 1.

[0116] Step S500, turn off the metering pump 71, and continue mixing and coating for 20min to 60min;

[0117] Among them, after turning off the metering pump 71, the liquid coating agent and powder continue to be mixed and coated for a duration greater than or equal to 20 minutes, which can avoid the problem that the powder in the cylinder 1 is not fully tumbled and is not completely mixed and coated evenly with the coating agent airflow formed by the nano-particles; the duration of the mixed coating is less than or equal to 60 minutes, which can ensure that the powder in the cylinder 1 is fully tumbled and mixed evenly with the nano-particles, thereby improving the coating efficiency.

[0118] Step S600, close the first heating mechanism 5, adjust the pressure of the carrier gas 812 delivered by the air delivery device 8 to the first fluidizing nozzle 3 to the low pressure gas supply pressure, and open the discharge port 13 of the cylinder 1 to complete the discharge. In some embodiments, after closing the first heating mechanism 5, it is also necessary to reduce the gas path pressure of the purge gas 811 in the process gas source 81, that is, adjust the pressure of the carrier gas 812 delivered by the air delivery device 8 to the low pressure gas supply pressure in the first fluidizing nozzle 3. At this time, nano-scale particles are no longer sprayed out of the first fluidizing nozzle 3, and only the purge gas 811 with a relatively low gas path pressure and not heated is blown into the cylinder 1, and the driving cylinder 62 in the discharge mechanism 6 is started to move the conical shell 61, and the conical shell 61 and the conical sealing seat 63 are opened to form a passage between the discharge port of the cylinder 1, and the material in the cylinder 1 flows out from the passage to complete the discharge. When the discharge is completed, the process gas source 81 and the filter mechanism 4 are closed to avoid material residue in the cylinder 1.

[0119] Step S700, closing the air supply device 8 and the filtering mechanism 4.

[0120] When implementing it, Figure 5 As shown, compared with the traditional coating method that uses only air as fluidizing gas to make the powder and the coating agent contact with the curved surface when they collide in relative motion, the gas mixing coating process provided in the present application is a coating form with all-round and three-dimensional wrapping contact, that is, through the first fluidizing nozzle 3 and the first heating mechanism 5, the sprayed coating agent airflow can drive the powder to rise and tumble fluidize and evaporate the moisture in the powder. The spiral air knife 24 scrapes the sticky material on the inner wall of the cylinder 1 while pressing the material downward during rotation, so that the material running direction is consistent with the flow field in the cylinder 1, and the cycle of material rising and falling is smoother. After the material is added, the mixing and coating is continued for a period of time to make the coating more complete and improve the coating effect.

[0121] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0122] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An airflow mixing coating device, characterized in that: include: A cylinder, wherein a feed port and an exhaust port are provided at the top of the cylinder, and a discharge port is provided at the bottom of the cylinder, wherein the feed port is used to input powder; The scraping mechanism comprises a driving component, a hollow rotating shaft and a spiral air knife, wherein the driving component is arranged on the cylinder, one end of the hollow rotating shaft is connected to the driving end of the driving component, the other end of the hollow rotating shaft extends into the cylinder, the hollow rotating shaft is driven by the driving component to rotate around the axis of the hollow rotating shaft, and the hollow rotating shaft is connected to an external air source through a rotary joint; the spiral air knife is connected to the other end of the hollow rotating shaft, and the spiral air knife is used to scrape the powder attached to the inner wall of the cylinder; A first purge nozzle is connected to the spiral air knife, the first purge nozzle is arranged at the edge of the blade of the spiral air knife, and the first purge nozzle is used to spray purge gas toward the inner wall of the cylinder to purge the powder on the inner wall of the cylinder; A second purge nozzle is arranged at the blade end of the spiral air knife, and the purge direction of the second purge nozzle is inclined downward along the circumferential direction of the cylinder; A third purge nozzle is disposed on the side wall of the cylinder, and the third purge nozzle is used for blowing toward the inner wall of the cylinder; A first fluidizing nozzle, the first fluidizing nozzle is located at the bottom of the cylinder, the spraying angle range of the first fluidizing nozzle is 30° to 80°, the first fluidizing nozzle atomizes the liquid coating agent by using a supersonic carrier gas and sprays a coating agent airflow formed by nano-scale coating particles into the interior of the cylinder, so that the coating agent airflow fluidizes in the cylinder and coats the powder in the cylinder; A second fluidizing nozzle is located at the bottom of the cylinder and is used to spray nano-scale solid coated particles into the cylinder and fluidize and coat the powder in the cylinder.

2. The airflow mixing and coating device according to claim 1, characterized in that: The first fluidizing nozzle comprises: A nozzle seat has an air pressure channel inside, and a liquid material inlet is opened on the wall of the nozzle seat; A nozzle core is sleeved in the nozzle seat, the nozzle core has a central spray hole and a radial channel, and the radial channel is connected to the central spray hole; A valve stem is sleeved in the nozzle seat, the valve stem has a central channel, the valve stem and the nozzle core, as well as the valve stem and the inner wall of the nozzle seat are sealed by a sealing ring, a liquid channel is formed between the valve stem and the nozzle seat, as well as between the nozzle core and the nozzle seat, the liquid inlet and the radial channel are both connected to the liquid channel, the central spray hole of the nozzle core is connected to the central channel of the valve stem to form a gas channel, the gas channel is connected to the compressed air channel, and the gas channel is blocked from the liquid channel, the liquid channel is used to pass the liquid coating agent, the gas channel is used to pass the carrier gas, the central spray hole is used to form a supersonic carrier gas, and the supersonic carrier gas is used to atomize the liquid coating agent and then spray out the coating agent gas flow formed by the nano-scale coated particles.

3. The airflow mixing coating device according to claim 2, characterized in that: The nozzle core is made of ceramic.

4. The airflow mixing coating device according to claim 1, characterized in that: The second fluidizing nozzle comprises: A second nozzle seat has a second compressed air passage therein, and a solid material inlet is provided on a wall of the second nozzle seat; A second nozzle core is sleeved in the second nozzle seat, and the second nozzle core has a second central spray hole; The second valve stem is sleeved in the second nozzle seat, the second valve stem has a second center channel, the second valve stem and the inner wall of the second nozzle seat are sealed by a second sealing ring, the second center spray hole, the second center channel and the second compressed air channel are connected to form a solid material channel, the solid material inlet is connected to the solid material channel, the solid material inlet is used to connect with a nano-scale solid coated particle source, and the second compressed air channel and the solid material channel are used to introduce carrier gas.

5. The airflow mixing and coating equipment according to claim 1, characterized in that: It also includes a filtering mechanism, which is communicated with the exhaust port of the cylinder and is used to filter the carrier gas and the purge gas discharged from the cylinder.

6. The airflow mixing coating device according to claim 5, characterized in that: The filtering mechanism comprises: At least two filter elements are disposed in the cylinder and are used to filter the carrier gas and the purge gas discharged from the cylinder; An air chamber is arranged outside the cylinder, each filter element is correspondingly connected to one of the air chambers, the air chamber has an air outlet and a back-blowing inlet, and the air outlet is used to discharge the filtered carrier gas and the purge gas; Back-blowing air bag, the back-blowing inlet of each air chamber is connected to a corresponding back-blowing air bag, and the back-blowing air bag is used to provide a back-blowing air flow through an external air source; Pneumatic ball valve: each air outlet of the air chamber is correspondingly connected to a pneumatic ball valve, and the pneumatic ball valve is used to control the on and off of the backblowing airflow.

7. The airflow mixing coating device according to claim 6, characterized in that: The filtering mechanism also includes: A fan, connected to the air outlet of each of the air chambers, for sucking the carrier gas and the purge gas discharged from the air outlet; A pulse valve is disposed between the corresponding connected back-blowing air bag and the air chamber, and the pulse valve is used to adjust the back-blowing pulse time and pulse time interval of the back-blowing air flow into each corresponding filter element; A pressure regulating valve is arranged between the back-blowing air bag and an external air source, and the pressure regulating valve is used to adjust the air flow pressure of the back-blowing air flow into each corresponding filter element; A differential pressure transmitter, wherein both ends of the differential pressure transmitter are connected to the cylinder and the air outlet of the air chamber respectively, and the differential pressure transmitter is used to detect the blockage condition of the filter element.

8. The airflow mixing and coating equipment according to claim 1, characterized in that: Also includes: A discharge mechanism is connected with the discharge port of the cylinder, and comprises a conical shell, a conical sealing seat and a driving cylinder. The conical sealing seat is coaxially arranged with the discharge port of the cylinder and is used to block the discharge port of the cylinder. The conical shell is sealingly connected with the conical sealing seat. The conical shell is located in the cylinder. The driving cylinder is drivingly connected with the conical shell. The driving cylinder is used to drive the conical sealing seat and the conical shell to move along the axial direction of the cylinder to open and close the discharge port. A pneumatic hammer is arranged on the outer wall of the cylinder, and is used for striking the outer wall of the cylinder.

9. An airflow mixing and coating system, characterized in that: include: The airflow mixing and coating device according to any one of claims 1 to 8; A coating agent material tank having a discharge end, the discharge end of the coating agent material tank being connected to the first fluidizing nozzle of the airflow mixing coating device and being used for storing the liquid coating agent; A metering pump, disposed at the discharge end of the coating agent tank, and used for adjusting the flow rate of the liquid coating agent passing into the first fluidizing nozzle; an air supply device, the air supply device comprising a process gas source, the process gas source being connected to the rotary joint and used for providing the purge gas to the rotary joint, the process gas source being connected to the first fluidizing nozzle and the second fluidizing nozzle of the airflow mixing and coating device and used for providing carrier gas to the first fluidizing nozzle and the second fluidizing nozzle; The first heating mechanism is connected to the first fluidizing nozzle and is used for heating the carrier gas introduced into the first fluidizing nozzle to dry the powder in the cylinder.

10. The airflow mixing and covering system according to claim 9, characterized in that: It also includes a second heating mechanism, which is coated on the outer wall of the coating agent tank and is used to heat the liquid coating agent in the coating agent tank.

11. The airflow mixing and covering system according to claim 9, characterized in that: Also includes: A weighing device is arranged outside the cylinder, and is used to weigh the cylinder.

12. The airflow mixing and covering system according to claim 9, characterized in that: Also includes: A spiral feeding mechanism for conveying nano-scale solid coated particles; A storage bin is connected to the discharge end of the spiral feeding mechanism, and the discharge end of the storage bin is connected to the solid material inlet of the second fluidizing nozzle. The storage bin is used to store the nano-scale solid coated particles, and the process gas source sprays the nano-scale solid coated particles introduced into the solid material inlet into the cylinder through the solid material channel of the second fluidizing nozzle.

13. An airflow mixing coating process, applicable to the airflow mixing coating system according to any one of claims 9 to 12, characterized in that: The airflow mixing coating process comprises: S100, heating the coating agent tank so that the temperature of the liquid coating agent reaches and stabilizes to a first set temperature; S200, turning on the first heating mechanism so that the temperature of the carrier gas reaches and stabilizes at a second set temperature; S300, turning on the air supply device and the filter mechanism of the airflow mixing and coating device, adjusting the pressure of the carrier gas delivered by the air supply device to the first fluidizing nozzle to the low-pressure supply pressure, and inputting the powder from the feed port of the barrel so that the input amount of the powder reaches the set weight; S400, turning on the metering pump and the scraping mechanism, adjusting the flow rate of the liquid coating agent entering the first fluidizing nozzle through the metering pump, adjusting the pressure of the carrier gas delivered to the first fluidizing nozzle by the air supply device to the high-pressure gas supply pressure, so that the carrier gas atomizes the liquid coating agent and sprays the coating agent airflow formed by nano-scale coated particles into the cylinder, so that the coating agent airflow fluidizes in the cylinder and covers the surface of the powder; scraping the powder attached to the inner wall of the cylinder through the scraping mechanism, and providing the first purge nozzle with purge gas through the air supply device to purge the powder on the inner wall of the cylinder; S500, turning off the metering pump and continuing the mixing and coating for 20 minutes to 60 minutes; S600, closing the first heating mechanism, adjusting the pressure of the carrier gas delivered by the gas delivery device to the first fluidizing nozzle to a low-pressure gas supply pressure, and opening the discharge port of the cylinder to complete the discharge; S700, closing the air supply device and the filtering mechanism.

Images