Powder coating modification device and powder coating modification method

Abstract

The invention discloses a powder coating modification device which comprises a powder stirring tank and a material conveying device connected with the powder stirring tank. The powder stirring tank comprises a stirring main blade arranged in the middle of a tank body, an auxiliary stirring blade arranged on the wall of the tank body, a bottom blowing device arranged at the bottom of the tank body, and a bottom inlet of the powder stirring tank connected with the bottom blowing device; an included angle of 1-75 degrees is formed between the bottom inlet and the tangent line of the annular cross section at the joint of the tank body for air intake; air enters the bottom blowing device through a bottom inlet, and powder turbulent flow is formed when the bottom blowing device, the auxiliary stirring blades and the main stirring blades rotate. By arranging the special stirring paddle, the column-type auxiliary stirring device and the column-type bottom blowing device, stable turbulent flow circulation is formed by powder particles in the stirring tank, rolling friction among the powder particles is improved, and therefore it is ensured that a coating material can be evenly attached to the surfaces of the powder particles, and coating uniformity and tightness are remarkably improved.

Description

Technical Field

[0001] The invention relates to the field of powder modification, in particular to a powder coating modification device and a powder coating modification method. Background Art

[0002] In the field of modified powder materials, especially in high-performance applications such as battery negative electrode materials, coating technology plays an important role. The coating process improves the performance of powder particles by improving their surface properties, such as improving conductivity, stability and cycle life. However, existing coating technologies, whether dry coating or gas phase coating, cannot completely solve the problem of low coating efficiency caused by air turbulence in the reactor, which makes it impossible to achieve the optimal coating time and coating rate.

[0003] 1. Dry coating

[0004] Although dry coating is widely used in industrial production due to its simplicity and economy, the coating material cannot be evenly distributed on the surface of powder particles due to the inability to effectively control the air turbulence inside the reaction tank. This not only affects the consistency of the coating layer, but also easily produces fine powder under high-speed stirring conditions, further reducing the coating efficiency and quality.

[0005] 2. Gas phase coating

[0006] Although the gas phase coating technology provides a more uniform coating layer and a higher coating rate, it also faces the problem of turbulent air flow in the reaction tank. This turbulence not only affects the effective deposition of the coating material, but also limits the coating rate, resulting in a longer coating cycle. In addition, the agglomeration phenomenon that may occur during the gas phase coating process, as well as the residual solvent problem caused by the use of liquid or gas media, also increase the complexity and cost of the process.

[0007] In view of the above problems, the current coating technology shows obvious shortcomings when dealing with high-demand applications such as battery negative electrode materials. Dry coating is difficult to ensure high coverage and uniformity, while gas phase coating is limited by complex processes, high energy consumption and safety issues. Therefore, it is urgent to develop new coating equipment and processes that can provide controllable turbulent circulation, while ensuring efficient and uniform coating, while also taking into account low cost and low energy consumption. Summary of the invention

[0008] In order to solve the defects in the prior art, the present invention provides a powder coating modification device and a powder coating modification method.

[0009] The present invention first provides a powder coating and modification device, comprising a powder stirring tank and a material conveying device connected to the powder stirring tank; the powder stirring tank comprises a main stirring blade arranged in the middle of the tank body, an auxiliary stirring blade arranged on the tank body wall, a bottom blowing device arranged at the bottom of the tank body, and a bottom inlet of the powder stirring tank connected to the bottom blowing device; the bottom inlet and the tangent of the annular cross-section at the connection between the tank body and the bottom inlet are at an angle of 1-75 degrees for air intake; the bottom blowing device takes in air through the bottom inlet and forms a stable powder turbulence when rotating with the auxiliary stirring blade and the main stirring blade.

[0010] The powder mixing tank is configured as a cylindrical or other annular tank shape. The material conveying device is preferably provided with a heating device for heating the wrapped material, and is preferably connected to the top of the powder mixing tank, and preferably uses a nozzle to atomize the material for modified coating of the powder. The main stirring blade is arranged at the center of the powder mixing tank, and rotates horizontally to stir the powder. The auxiliary stirring blade is arranged at the tank wall of the powder mixing tank, and preferably stirs and rotates vertically; the axial line of the auxiliary stirring blade is preferably consistent with the center direction of the tank body, reducing the redundant turbulent circulation of the auxiliary stirring blade in the horizontal direction. The bottom blowing device and the bottom inlet are correspondingly arranged, and the tangent of the horizontal annular cross section of the bottom inlet and the tank body connection is preferably arranged at a certain angle, and can also be arranged so that the bottom inlet is consistent with the tangent direction of the circular tank body connection, preferably set at an angle of 1-75 degrees. Powder turbulence is the change of the bottom airflow direction of the bottom inlet intake, plus the airflow redirection of the auxiliary stirring blade in the vertical direction and the airflow redirection of the main stirring blade in the horizontal direction, together forming a turbulent system in the tank body.

[0011] The present invention also provides the following optimization scheme:

[0012] Furthermore, the material conveying device is arranged on the top of the powder stirring tank and is arranged corresponding to the front end position of the auxiliary stirring blade.

[0013] The corresponding arrangement of the front end position of the material conveying device and the auxiliary stirring blade means that the front end position of the material conveying device and the auxiliary stirring blade can be arranged at the same vertical concentric position, that is, the outlet of the material conveying device and the position of the auxiliary stirring blade are maintained in the same radial direction vertically, and preferably also correspond vertically in the annular direction, that is, the position of the material conveying device and the auxiliary stirring blade are arranged on the same radial line when viewed from vertically upward to downward. The reason for such arrangement is that the auxiliary stirring blade forms the airflow direction in the vertical direction, and the outlet of the material conveying device is arranged at the position of the auxiliary stirring blade so that the powder can be wrapped more evenly when the material is sprayed. The dispersion and uniformity of the material sprayed by the auxiliary stirring blade in the same radial direction are far better than those in other positions. And when multiple auxiliary stirring blades are arranged, only one material conveying device can be arranged at the radial position of the auxiliary stirring blade, or multiple material conveying devices can be arranged in one-to-one correspondence with the auxiliary stirring blade.

[0014] Furthermore, a tank heater is provided on the outer surface of the annular tank body of the powder mixing tank.

[0015] The tank body heater is preferably arranged on the outer surface of the annular tank body of the entire powder mixing tank. The temperature setting from top to bottom is not completely consistent. Multiple temperature sensors are arranged inside the annular tank body according to different heights. If the temperature difference is large, the local temperature will be adjusted separately to keep the temperature inside the tank body consistent.

[0016] Furthermore, the bottom blowing device is adapted to the bottom inlet and is arranged in plurality.

[0017] Furthermore, a plurality of the bottom blowing devices are arranged in a row along the circumferential direction of the bottom of the powder mixing tank.

[0018] The bottom blowing device is preferably provided with a heating device so that the gas blown therein matches the temperature of the air in the tank. Different temperatures of the bottom blowing gas need to be set according to different powder materials.

[0019] Furthermore, a plurality of auxiliary stirring blades are provided.

[0020] Furthermore, the plurality of auxiliary stirring blades are arranged in a row along the circumferential direction of the annular surface of the powder stirring tank.

[0021] Furthermore, the angles between the plurality of auxiliary stirring blades and the bottom blowing device remain consistent.

[0022] When the multiple auxiliary stirring blades and the bottom blowing device are arranged along the circumferential direction, the spacing between the two is preferably kept consistent, and the spacing between the multiple auxiliary stirring blades and the bottom blowing device is kept consistent, so that the circulating airflow in the entire tank body can maintain circulation as a whole, and the large airflow in the tank body can maintain a large circulation of the airflow while maintaining local turbulence.

[0023] Furthermore, the main stirring blades are arranged in multiple groups.

[0024] Furthermore, the topmost stirring main blade is configured as an upward-curved stirring main blade.

[0025] Furthermore, the height of the auxiliary stirring blade is slightly lower than that of the upturned main stirring blade.

[0026] A plurality of auxiliary stirring blades are preferably arranged at the same height and between a plurality of stirring main blades of different heights, and are preferably arranged between the highest stirring main blade and the second highest stirring main blade. When setting, the blade length of the second highest stirring main blade is preferably designed to be shorter than that of other stirring main blades to optimize the turbulent space formed when the auxiliary stirring blade and the plurality of stirring main blades are transformed. The setting of the upturned stirring main blade is preferably arranged in two parts, one part is the tail end connected to the stirring shaft, and the other part is the front end relatively far away from the stirring shaft. The tail end can be arranged in a horizontal extension direction, and the front end can be arranged to be tilted at an angle of about 1-60 degrees with the horizontal direction. The upturned stirring main blade can also be arranged as an upturned stirring main blade that is entirely in an arc shape, and the shape of the upturned stirring main blade is mainly arranged according to the material and particle size of the powder. The reason for such a setting is to achieve the maximum tumbling of the powder particles in the space. The biggest problem of the existing stirring device is the uneven coating of the powder, and the uniform coverage of the high-fineness powder cannot be achieved.

[0027] The coating of powders with high fineness and high coverage rate needs to meet two performance indicators: one is small coating particle size, and the other is high coating uniformity. Small coating particle size means that the coating time and material consumption of powder materials should be small, and the coating process in the stirring device should be short; high coating uniformity means that the rolling angle of the coated powder material should be large, and 360-degree overall rolling or even multiple turnovers should be achieved. In order to achieve this goal, first of all, it is necessary to ensure that the material is sprayed evenly on the powder material. The present invention achieves this by adapting the inlet of the material conveying device and the front end position of the auxiliary stirring blade in the radial direction. Secondly, it is necessary to ensure that the turnover degree of the powder material is large. This is achieved by setting the auxiliary stirring blade between the highest stirring main blade and the second highest stirring main blade, and setting the highest stirring main blade as an upturned stirring main blade to achieve the maximum rolling of the powder material in the vertical direction. Such a setting can form a stronger airflow turbulence between the auxiliary stirring blade and the stirring main blade, and maximize the angle flipping of the powder material.

[0028] Beneficial effects of the present invention:

[0029] 1. By setting up special stirring main blades, split auxiliary stirring blades and split bottom blowing devices, the powder particles form a stable turbulent circulation in the stirring tank, which improves the rolling friction between the powder particles, thereby ensuring that the coating material can be evenly attached to the surface of the powder particles, significantly improving the uniformity and tightness of the coating.

[0030] 2. The design of the tank heater enables the temperature inside the tank to be evenly controlled. The bottom blowing device has a heating function, which can eliminate the material dead angle caused by the mechanical gap between the stirring blade and the tank, and reduce the temperature error caused by the eddy current generated by high-speed rotation, so that the powder particles are heated more evenly, reducing the possibility of powder agglomeration and helping to improve the adhesion of the coating material.

[0031] 3. The innovative thermal spray mechanical coating modification process combines the advantages of thermal spraying and mechanical dry coating processes. It accurately controls the flow of coating materials through a precision unidirectional quantitative pump and adjusts the particle size of the particles ejected by the atomizing nozzle according to the particle size of the powder particles to achieve precise coating, greatly saving coating materials.

[0032] 4. The reasonable arrangement of the column-type auxiliary stirring and bottom blowing devices enables the powder particles to tumble and circulate efficiently without dead angles in the tank body, eliminating the problem of the single powder movement trajectory in the cavity of traditional high-mix equipment, improving the mixing efficiency between powder particles, ensuring the surface smoothness and roundness of the finished product, and improving the uniformity of the finished product coating. The powder coating rate of the present invention can reach more than 99%, and the coating effect can last for at least several months.

[0033] 5. The coating process provided by the present invention is simple to operate, applicable to various types of powder particles, and has low energy consumption and low cost. It can be widely used in high-performance application fields such as battery negative electrode materials and meet high-demand modification needs.

[0034] The powder coating modification device and method provided by the present invention effectively solves the air flow turbulence problem existing in the traditional coating technology by optimizing the internal structure of the stirring tank and the coating process flow, improves the coating efficiency and uniformity, and realizes efficient and uniform coating while taking into account low cost and low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The powder coating and modification device of the present invention;

[0036] Figure 2 It is a circular cross-sectional view of the powder mixing tank of the present invention at the bottom inlet height position;

[0037] Figure 3 It is an annular cross-sectional view of the powder mixing tank of the present invention at the height position of the auxiliary mixing blade;

[0038] The specific drawings are as follows:

[0039] 1. Material conveying device; 2. Powder mixing tank; 3. Tank heater; 4. Main stirring blade; 5. Auxiliary stirring blade; 6. Bottom inlet; 8. Bottom blowing device. DETAILED DESCRIPTION

[0040] The technical scheme in the embodiment of the present invention will be described in detail below in conjunction with the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The present invention discloses a powder coating modification device and a powder coating modification method thereof, aiming to provide a device and a method capable of efficiently and uniformly coating powder particles, so as to solve the air flow turbulence problem existing in the prior art and improve the coating efficiency and uniformity.

[0042] like Figure 1-3 As shown, the powder coating and modification device provided by the present invention comprises a powder stirring tank 2 and a material conveying device 1 connected to the powder stirring tank 2. A stirring main blade 4 and an auxiliary stirring blade 5 are arranged inside the powder stirring tank 2, and a bottom blowing device 8 and a bottom inlet 6 are arranged at the bottom, wherein the bottom inlet 6 and the tangent of the annular cross section at the connection of the tank body are at an angle of 1-75 degrees for air intake. The bottom blowing device 8 takes in air through the bottom inlet 6, and forms a powder turbulence when rotating with the auxiliary stirring blade 5 and the stirring main blade 4.

[0043] The material conveying device 1 is arranged on the top of the powder mixing tank 2 and is equipped with a nozzle for atomizing the material. A heating device is provided to ensure that the coating material reaches an appropriate temperature before entering the tank. The outlet of the material conveying device 1 is arranged corresponding to the front end position of the auxiliary stirring blade 5, that is, the two are kept in the same radial direction in the vertical direction.

[0044] The material conveying device 1 performs atomization of the material through the nozzle, so that the coating material can be evenly dispersed on the surface of the powder particles in the form of fine droplets, avoiding the problem of large particles or uneven spraying. The atomized droplets can quickly adhere to the powder surface in a short time, improving the coating efficiency.

[0045] The heating device of the material conveying device 1 can ensure that the coating material reaches an appropriate temperature before entering the tank body, so that its viscosity is reduced and its fluidity is enhanced, so that it is easier to adhere to the surface of the powder particles. This not only improves the adhesion of the coating material, but also reduces the condensation or agglomeration that may occur during the coating process.

[0046] The outlet of the material conveying device 1 is arranged corresponding to the front end of the auxiliary stirring blade 5, so that the material can directly act on the rotating auxiliary stirring blade 5 when spraying, and the airflow generated by the auxiliary stirring blade 5 is used to evenly distribute the coating material in the entire tank. This design can significantly improve the uniformity and coverage of the coating, and avoid the generation of material dead corners.

[0047] The powder mixing tank 2 is a cylindrical or other annular tank body, with a material conveying device 1 connected to the top, and a bottom blowing device 8 and a bottom inlet 6 at the bottom. The tank heater 3 is evenly distributed on the outer surface of the powder mixing tank 2, and the temperature at different heights can be adjusted from top to bottom as needed to ensure the consistency of the temperature inside the tank. The tank heater 3 is designed to ensure the uniform distribution of temperature inside the tank body and avoid local overheating or overcooling. The temperature changes inside the tank body are monitored in real time by multiple temperature sensors. When the local temperature difference is large, it can be adjusted separately to ensure that the temperature inside the entire tank body remains consistent. In this way, it can ensure that the surface of the powder particles is heated evenly, which is conducive to the adhesion of the coating material and avoids uneven coating or failure due to uneven temperature.

[0048] The cylindrical or other annular tank design helps to reduce the dead zone in the tank, so that the powder particles can be fully tumbled and mixed in the tank. This shape can also better cooperate with the auxiliary stirring blade 5 and the bottom blowing device 8 to form a good air circulation and promote the uniform distribution of powder particles.

[0049] In order to further improve the coating efficiency, the present invention also provides a tank heater 3 on the outer surface of the annular tank body of the powder mixing tank 2 to better control the temperature inside the tank body. The tank heater 3 can evenly heat the powder particles in the tank body so that the surface is evenly heated, which is conducive to the adhesion of the coating material.

[0050] The tank heater 3 is evenly distributed on the outer surface of the powder mixing tank 2, and the temperature at different heights can be adjusted from top to bottom as needed. The temperature changes inside the tank are monitored in real time through multiple temperature sensors. When the local temperature difference is large, it can be adjusted separately to ensure that the temperature inside the entire tank remains consistent.

[0051] The design of the tank heater 3 allows the temperature to be adjusted at different heights from top to bottom. This temperature gradient control can meet the needs of different coating processes. For example, in some cases, a higher temperature may be required at the top of the tank to promote rapid evaporation and solidification of the coating material; while in other cases, a higher temperature may be required at the bottom of the tank to prevent powder particles from settling. By flexibly adjusting the temperature gradient, the coating process can be optimized and the coating quality and efficiency can be improved.

[0052] The setting of multiple temperature sensors can monitor the temperature changes inside the tank in real time to ensure that the temperature is always kept within the set range. This real-time monitoring mechanism can promptly detect and correct temperature anomalies to avoid uneven coating or failure caused by temperature fluctuations.

[0053] The bottom blowing device 8 is adapted to the bottom inlet 6 and multiple bottom blowing devices 8 are arranged in a row along the circumference of the bottom of the powder mixing tank 2. This ensures that the powder particles in the tank are evenly heated, eliminates material dead corners, and reduces powder agglomeration. The bottom blowing device 8 is preferably equipped with a heating device to ensure that the gas blown in matches the air temperature in the tank.

[0054] The bottom blowing device 8 has a heating function and can adjust the temperature of the blown gas to match the air temperature in the tank. Multiple bottom blowing devices 8 are arranged in a row along the circumference of the bottom of the powder mixing tank 2 to ensure uniform heating of the powder particles in the tank, eliminate dead corners of the material, and reduce powder agglomeration. The bottom inlet 6 is adapted to the bottom blowing device 8, and the tangent of the bottom inlet 6 and the tank body is at an angle of 1-75 degrees, ensuring that the gas can effectively change the flow direction when entering, and promote the formation of stable powder turbulence in the tank.

[0055] like Figure 2 As shown, the tangent line of the bottom inlet 6 and the connection of the tank body is at an angle of 1-75 degrees. This design can effectively guide the gas to change its flow direction after entering the tank body, forming an upward airflow. This airflow can lift the powder particles and suspend them in the tank body to avoid sedimentation. At the same time, the change in the direction of the airflow can also break the traditional vortex structure, forming a more complex turbulent system, and promoting full mixing and collision between powder particles.

[0056] The bottom blowing device 8 has a heating function, which can adjust the temperature of the blown gas to match the air temperature in the tank. This design can avoid condensation or agglomeration caused by temperature differences and ensure the stability of the environment in the tank. In addition, the heated gas can further promote the evaporation and solidification of the coating material and improve the coating efficiency.

[0057] Multiple bottom blowing devices 8 are arranged in a row along the circumference of the bottom of the powder mixing tank 2. This design can ensure that the powder particles in the tank are evenly heated and avoid local overheating or overcooling. At the same time, the multi-point bottom blowing devices 8 can also eliminate the material dead angle caused by the mechanical gap between the blades and the tank, ensuring that all powder particles can be fully stirred and coated.

[0058] A plurality of auxiliary stirring blades 5 are also provided, and are arranged in a row along the circumferential direction of the annular surface of the powder stirring tank 2. The angles between the plurality of auxiliary stirring blades 5 and the bottom blowing device 8 are consistent to enhance the rolling friction between the powder particles and improve the uniformity and tightness of the coating.

[0059] The stirring main blades 4 are arranged in multiple groups, and the topmost stirring main blades 4 are arranged in an upward tilted manner to optimize the turbulent space formed by the transformation between the auxiliary stirring blades 5 and the stirring main blades 4. Multiple auxiliary stirring blades 5 are arranged at the same height and are located between the stirring main blades 4 of different heights. The blade length of the second highest stirring main blade 4 is shorter than that of the other blades to optimize the turbulent space formed when the auxiliary stirring blades 5 and the multiple stirring main blades 4 are transformed.

[0060] A plurality of stirring main blades 4 are arranged at the center of the powder stirring tank 2 and rotate horizontally. The stirring main blade 4 at the top is designed to be upwardly tilted, with the front end tilted upward by 1-60 degrees relative to the rear end. The stirring main blade 4 is driven by a motor to rotate, providing a stirring force in the horizontal direction, so as to promote the full mixing of the powder material in the tank.

[0061] The topmost stirring main blade 4 is designed with an upward tilt, with the front end tilted upward by 1-60 degrees. The purpose is to break the traditional horizontal stirring mode and make the powder particles form a larger rolling angle in the tank. This design can significantly increase the vertical movement of powder particles, especially in the upper area of ​​the tank, avoiding the common powder accumulation phenomenon in traditional stirring devices. The design of the upward-tilted main stirring blade 4 enables the powder particles to achieve a 360-degree overall tumbling in the tank, and even flip multiple times, greatly improving the uniformity and coverage of the coating.

[0062] The stirring main blades 4 are arranged in multiple groups, and the blade length of the second highest stirring main blade 4 is shorter, which is to optimize the turbulent space formed when the auxiliary stirring blade 5 is transformed with the multiple stirring main blades 4. Through this design, a more complex airflow structure can be formed in the tank body, further enhancing the collision and friction between the powder particles and promoting the uniform adhesion of the coating material.

[0063] like Figure 3 As shown, a plurality of auxiliary stirring blades 5 are arranged in a circumferential direction along the annular surface of the powder stirring tank 2, and rotate vertically, and the axial direction is consistent with the center direction of the tank body, so as to reduce the unnecessary turbulent circulation in the horizontal direction. Driven by a motor, the rotation direction is opposite to the main stirring blade 4, so as to enhance the rolling friction between the particles. The auxiliary stirring blade 5 is designed to rotate vertically, and its main purpose is to form the airflow direction in the vertical direction to avoid the unnecessary turbulent circulation in the horizontal direction. This design can effectively reduce the energy loss in the horizontal direction, so that the airflow acts more concentratedly on the powder particles, and promotes the tumbling and mixing in the vertical direction. The vertical airflow can also help the powder particles to be better suspended in the tank body, and avoid the occurrence of sedimentation.

[0064] The number and position of the auxiliary stirring blades 5 are determined according to the size of the tank body, and are usually arranged at the same height and between the highest and second highest stirring main blades 4. This layout can maximize the use of the space in the tank body, ensuring that the powder particles can be fully stirred and mixed in all directions. At the same time, the cooperation between the auxiliary stirring blades 5 and the stirring main blades 4 can form a stronger air turbulence, further improving the uniformity and tightness of the coating.

[0065] The rotation direction of the auxiliary stirring blade 5 is preferably opposite to that of the main stirring blade 4. This design can enhance the rolling friction between particles, causing the powder particles to continuously roll and collide in the tank body, increasing the contact opportunity between the coating material and the powder particles, and further improving the uniformity and coverage of the coating.

[0066] In actual operation, the powder particles are transported to the powder mixing tank 2 through the material conveying device 1. The mixing tank heater 3 is started, so that the surface of the powder particles is heated to promote the adhesion of the coating material. Subsequently, the special stirring blade 4 rotates at high speed, the auxiliary stirring blade 5 starts to rotate, and the bottom blowing device 8 is started. The bottom blowing device 8 blows the air into the tank after heating to eliminate the temperature unevenness caused by the eddy current generated after the stirring blade rotates at high speed. The number and position of the auxiliary stirring blade 5 are determined according to the size of the tank body, and its rotation direction is opposite to that of the main stirring blade 4 to enhance the rolling friction between the particles. The number of bottom blowing devices 8 is determined according to the size of the tank body, and they are all distributed at the bottom of the tank body to eliminate the material dead angle caused by the mechanical gap between the blade and the tank body. The powder particles tumble and circulate efficiently and without dead angles in the tank body, forming good turbulence and eddy currents, so that the coating effect is uniform and tight.

[0067] Combining the advantages of thermal spraying and mechanical dry coating processes, the present invention also provides an innovative thermal spraying mechanical coating modification process method. Specifically, the coating material thermal spraying system is connected to the top cover of the stirring tank. After it is turned on, the coating material solution is fully atomized and sprayed with a precise flow rate onto the surface of the powder particles tumbling and circulating in the stirring tank. The flow rate is adjusted by a precision unidirectional quantitative pump to achieve precise control of the coating thickness. The particle size of the atomized particles is adjustable, and it is adjusted according to the particle size of the powder particles to be coated to ensure uniform spraying of the coating material and save coating materials.

[0068] The present invention realizes efficient and uniform coating of powder particles during the coating process through the above-mentioned technical scheme, and solves the problem of low coating efficiency caused by air flow turbulence in traditional coating technology. Through the design of column bottom blowing and column sub-stirring, the complexity of the movement trajectory of powder particles in the stirring tank is improved, the mixing efficiency between particles and the temperature uniformity of the coating material and the coated powder are enhanced, so that the coating uniformity of the finished product is higher, and the coating quality and efficiency are effectively improved. The above is only a preferred embodiment of the present invention. It should be pointed out that the above-mentioned preferred embodiment should not be regarded as a limitation of the present invention, and the scope of protection of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A powder coating modification device, characterized in that: The invention comprises a powder mixing tank and a material conveying device connected to the powder mixing tank; the powder mixing tank comprises a main mixing blade arranged in the middle of the tank body, an auxiliary mixing blade arranged on the wall of the tank body, a bottom blowing device arranged at the bottom of the tank body, and a bottom inlet of the powder mixing tank connected to the bottom blowing device; the bottom inlet and the tangent of the annular cross section at the connection between the bottom inlet and the tank body form an angle of 1-75 degrees for air intake; the bottom blowing device takes in air through the bottom inlet, and forms powder turbulence when rotating with the auxiliary mixing blade and the main mixing blade.

2. The powder coating and modification device according to claim 1, characterized in that: The material conveying device is arranged on the top of the powder stirring tank and is arranged corresponding to the front end position of the auxiliary stirring blade.

3. The powder coating and modification device according to claim 1, characterized in that: A tank heater is arranged on the outer surface of the annular tank body of the powder stirring tank.

4. The powder coating and modification device according to claim 1, characterized in that: The bottom blowing device is adapted to the bottom inlet and is arranged in plurality.

5. The powder coating and modification device according to claim 4, characterized in that: A plurality of bottom blowing devices are arranged in a row along the circumference of the bottom of the powder mixing tank.

6. The powder coating and modification device according to claim 5, characterized in that: The auxiliary stirring blades are provided in plurality.

7. The powder coating and modification device according to claim 6, characterized in that: The plurality of auxiliary stirring blades are arranged in a row along the circumferential direction of the annular surface of the powder stirring tank.

8. The powder coating and modification device according to claim 1, characterized in that: The main stirring blades are arranged in multiple groups.

9. The powder coating and modification device according to claim 8, characterized in that: The topmost stirring main blade is arranged as an upward-curved stirring main blade.

10. A powder coating modification method, characterized in that: The powder coating and modification device according to any one of claims 1 to 9 is used to perform powder modification.

Images