Powder fluidization coating device
By setting a uniform flow structure in the air storage chamber of the powder fluidization coating device and installing a homogenized stirring mechanism at the bottom of the fluidization cavity, the problem of uneven air flow distribution of the fluidization plate is solved, and the flatness of the fluidization surface and the quality of the sprayed product are significantly improved.
Patent Information
- Application Number
- CN202510290788.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2025-05-06
AI Technical Summary
In the existing powder fluidized coating devices, the airflow distribution of the fluidized plate is not uniform enough, resulting in unevenness in the fluidized surface and affecting product quality.
A powder fluidization coating device is designed, including a uniform flow structure in the gas storage chamber, and the air flow is distributed more evenly through multiple ventilation holes and ring plate structures, and combined with a homogenization and stirring mechanism at the bottom of the fluidization chamber, further improving the uniformity of the air flow distribution.
Through the combination of the uniform flow structure and the homogenization and stirring mechanism, the uniformity of the airflow distribution on the fluidized plate is significantly improved, the unevenness of the fluidized surface is reduced, and the quality of the sprayed products is improved.
Smart Images
Figure CN119926759A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of powder coating, in particular to a powder fluidization coating device. Background Art
[0002] Powder fluidized coating is a surface coating technology widely used in the industrial field, mainly used for anti-corrosion, decoration and functional treatment of metals, plastics and other materials. The principle is to place dry fine powder on the fluidized plate, introduce compressed gas under the fluidized plate, and blow the compressed gas out from the fluidized holes of the fluidized plate, so that the powder is suspended on the fluidized plate to form a fluid-like state, and then the powder is evenly coated on the surface of the workpiece by electrostatic adsorption or thermal cladding.
[0003] In powder fluidized coating, the fluidized surface refers to the surface where the powder particles in the fluidized coating equipment are suspended under the action of airflow and form a fluid-like state. Specifically, the fluidized surface is the dynamic interface formed after the powder particles and air are mixed in the fluidized coating equipment. The uneven fluidized surface will cause the coating surface of the product to fluctuate in a wavy shape, affecting the quality of the product. The current powder fluidized coating device generally directly passes the compressed gas into the gas storage chamber under the fluidizing plate. Due to the certain flow inertia after the compressed gas is passed, the gas pressure at different positions in the gas storage chamber will be different, which will cause the gas distribution at different positions when the gas passes through the fluidizing plate to be different. The gas flow rate passing through some fluidized holes is large, and the gas flow rate passing through some fluidized holes is small. The device has the problem of uneven airflow distribution of the fluidized plate, which will cause the fluidized surface of the device to be more uneven, and it is difficult to meet the coating requirements of high-quality products. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide a powder fluidization coating device which can make the airflow distribution of the fluidization plate more uniform.
[0005] The technical solution adopted by the present invention to solve its technical problems is: a powder fluidized coating device, including a cylindrical cavity, and a fluidizing plate horizontally arranged in the cavity and dividing the cavity into a fluidizing cavity and an air storage cavity arranged up and down; a sealing bottom plate is provided at the bottom of the air storage cavity, an air vent communicating with the air storage cavity is provided on the air storage cavity, and a uniform flow structure is provided in the air storage cavity to evenly distribute the gas in the air storage cavity.
[0006] Furthermore, the vent holes are vertically arranged on the bottom plate, and there are a plurality of vent holes, which are arranged at intervals around the center of the bottom plate;
[0007] The uniform flow structure includes a first ring plate, a second ring plate, a disc-shaped reflow plate, and a mesh plate horizontally arranged in the air storage cavity and dividing the air storage cavity into an upper air storage cavity and a lower air storage cavity arranged up and down; the first ring plate, the second ring plate, and the disc-shaped reflow plate are all arranged in the lower air storage cavity, the first ring plate is arranged above the ring formed by the air vent to block the airflow of the air vent from flowing upward directly, the second ring plate is horizontally arranged above the first ring plate, and the outer edge is sealed and connected to the inner wall of the lower air storage cavity, and the inner edge is located on the outer side of the first ring plate, and the disc-shaped reflow plate is horizontally arranged above the first ring plate and is located on the inner side of the first ring plate.
[0008] Furthermore, the second ring plate and the disc-shaped return plate are arranged at the same height.
[0009] Furthermore, the inner end of the second ring plate and the outer end of the disc-shaped return plate are both provided with an inclined portion inclined downward.
[0010] Furthermore, the ventilation holes are evenly arranged around the center of the bottom plate.
[0011] Furthermore, a homogenizing and stirring mechanism is provided at the bottom of the fluidizing chamber to rotate the airflow along the circumferential direction of the fluidizing chamber, thereby improving the flatness of the fluidizing surface.
[0012] Furthermore, the homogenizing and stirring mechanism includes a rotating shaft and a plurality of stirring blades evenly arranged along the circumference of the rotating shaft, the rotating shaft is vertically arranged at the center of the fluidizing chamber, the stirring blades are arranged in the same horizontal plane, and are respectively inclined in the same rotation direction relative to the radial direction of the rotating shaft, so as to form a centrifugal force offset angle between the stirring blades and the radial direction of the rotating shaft, so that the fluidized powder can overcome the stirring centrifugal force generated by the rotation of the stirring blades along their inclined direction.
[0013] Furthermore, when the rotation speed of the rotating shaft is 2 rpm, the thickness of the stirring blade does not exceed 3 mm, and the height is between 2 and 5 mm.
[0014] Furthermore, the homogenizing and stirring mechanism also includes a reinforcing ring, in which the stirring blade is sleeved, and the outer end of the stirring blade is fixedly connected to the reinforcing ring.
[0015] Furthermore, it also includes a stirring drive mechanism, and the lower end of the rotating shaft passes downward through the bottom plate and is drivingly connected to the stirring drive mechanism.
[0016] The beneficial effects of the present invention are as follows: the powder fluidized coating device of the present invention is provided with a uniform flow structure in the air storage chamber 12 for evenly distributing the gas in the air storage chamber 12. The uniform flow structure can make the airflow more evenly distributed under the fluidizing plate 2, thereby making the airflow pass through the fluidizing plate more evenly. The fluidized airflow distribution on the fluidizing plate is more even, which can reduce the unevenness of the fluidizing surface of the powder fluidized coating device, make the fluidizing surface smoother during the operation of the device, and improve the quality of the sprayed products. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of the present invention;
[0018] Figure 2 It is a structural schematic diagram of the uniform flow structure;
[0019] Figure 3 is a top view of the present invention;
[0020] As shown in the figure: cavity 1, fluidizing plate 2, first ring plate 3, second ring plate 4, disc-shaped reflux plate 5, mesh plate 6, seal 8, pressing block 9, stirring drive mechanism 10, fluidizing chamber 11, air storage chamber 12, dust-proof shielding door 13, inclined portion 41, rotating shaft 71, stirring blade 72, reinforcing ring 73, bottom plate 121, upper air storage chamber 122, lower air storage chamber 123, and air vent 1211. DETAILED DESCRIPTION
[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0022] like Figure 1 , Figure 2 As shown, the powder fluidized coating device of the present invention comprises a cylindrical cavity 1, and a fluidizing plate 2 horizontally arranged in the cavity 1 and dividing the cavity 1 into a fluidizing cavity 11 and a gas storage cavity 12 arranged vertically. A sealing bottom plate 121 is provided at the bottom of the gas storage cavity 12, a vent hole 1211 communicating with the gas storage cavity 12 is provided on the gas storage cavity 12, and a uniform flow structure is provided in the gas storage cavity 12 to evenly distribute the gas in the gas storage cavity 12.
[0023] The vent hole 1211 may be disposed on the bottom plate or the side wall of the air storage cavity 12. Figure 1 and Figure 2 As shown, the vent holes 1211 are vertically arranged on the bottom plate 121, and there are multiple (at least 2) vent holes 1211, which are arranged at intervals around the center of the bottom plate 121. The vent holes 1211 are preferably evenly arranged around the center of the bottom plate 121. The more vent holes 1211 there are, the more conducive it is to make the gas in the gas storage cavity 12 more evenly distributed.
[0024] like Figure 1and Figure 2 As shown, when the vent 1211 is vertically arranged on the bottom plate 121, and there are multiple vents 1211, which are arranged at intervals around the center of the bottom plate 121, in the embodiment of the present invention, the uniform flow structure includes a first ring plate 3, a second ring plate 4, a disc-shaped reflow plate 5, and a mesh plate 6 horizontally arranged in the air storage cavity 12 and dividing the air storage cavity 12 into an upper air storage cavity 122 and a lower air storage cavity 123 arranged up and down; the first ring plate 3, the second ring plate 4 and the disc-shaped reflow plate 5 are all arranged in the lower air storage cavity 123, the first ring plate 3 is arranged above the ring surrounded by the vent 1211 to block the air flow of the vent 1211 from flowing directly upward, the second ring plate 4 is horizontally arranged above the first ring plate 3, and the outer edge is sealed and connected to the inner wall of the lower air storage cavity 123, and the inner edge is located on the outer side of the first ring plate 3, and the disc-shaped reflow plate 5 is horizontally arranged above the first ring plate 3 and is located on the inner side of the first ring plate 3.
[0025] After the compressed air is vertically introduced into the air storage chamber 12 through the vent hole 1211, the airflow is blocked by the action of the first ring plate 3, and the airflow cannot flow directly upward, and the airflow will be diverted to the two sides of the first ring plate 3. The airflow diverted to the outside of the first ring plate 3 flows back to the first ring plate 3 under the action of the second ring plate 4 and the cavity wall, and the airflow diverted to the inside of the first ring plate 3 flows back to the first ring plate 3 under the action of the disc-shaped return plate 5. The two return airflows collide and mix with each other to form turbulence, thereby achieving the purpose of better homogenization and dispersion of the gas. Finally, the airflow passes through the mesh plate 6 and is dispersed and refined again by the mesh plate 6, so that the airflow can be more evenly distributed below the fluidizing plate 2, that is, in the upper air storage chamber 122, and then the airflow distribution of the fluidizing plate can be made more uniform, which can reduce the unevenness of the fluidizing surface of the powder fluidization coating device and make the fluidizing surface smoother during the operation of the device.
[0026] The outer edge of the second ring plate 4 can be sealed and connected to the inner wall of the lower air storage cavity 123 by means of a sealing ring or full welding connection.
[0027] The mesh plate 6 can be a mesh plate with the same pore size distribution as the fluidizing plate 2, or a mesh plate with a pore size larger than the pore size of the fluidizing plate 2. The more meshes the mesh plate 6 has, the more conducive it is to airflow homogenization, but the greater the obstruction and pressure reduction effect on the airflow, the more compressed gas with higher pressure needs to pass through.
[0028] In some embodiments, the uniform flow structure is a plurality of mesh plates disposed above the vents 1211. The obstruction of the mesh plates and the flow diversion of the meshes allow the airflow to flow more evenly and dispersedly into the lower portion of the fluidizing plate 2. This structure may result in a greater pressure loss of the compressed gas.
[0029] The second ring plate 4 and the disc-shaped reflow plate 5 can be arranged at the same height or at different heights. In the present invention, it is best that the second ring plate 4 and the disc-shaped reflow plate 5 are arranged at the same height. The second ring plate 4 and the disc-shaped reflow plate 5 are arranged at the same height, and the two reflow airflows collide and mix better with each other, which is more conducive to the homogenization of the gas in the gas storage chamber 12.
[0030] The second ring plate 4 and the disc-shaped reflow plate 5 can both be flat plate structures. In order to better allow the airflow to collide, in the present invention, preferably, the inner end of the second ring plate 4 and the outer end of the disc-shaped reflow plate 5 are both provided with an inclined portion 41 inclined downward (see Figure 2 ).
[0031] The bottom of the fluidizing chamber 11 of the present invention is provided with a homogenizing and stirring mechanism that causes the airflow to rotate along the circumferential direction of the fluidizing chamber 11, thereby improving the flatness of the fluidizing surface. Figure 2 and Figure 3 As shown, specifically, the homogenizing and stirring mechanism includes a rotating shaft 71 and a plurality of stirring blades 72 uniformly arranged along the circumference of the rotating shaft 71. The rotating shaft 71 is vertically arranged at the center of the fluidizing chamber 11. The stirring blades 72 are arranged in the same horizontal plane and are respectively inclined in the same rotation direction relative to the radial direction of the rotating shaft 71, so as to form a centrifugal force offset angle α between the stirring blades 72 and the radial direction of the rotating shaft 71, which enables the fluidized powder to overcome the stirring centrifugal force generated by the stirring blades 72 rotating along the inclined direction. In the figure, the stirring blades 72 are inclined in the counterclockwise rotation direction of the rotating shaft relative to the radial direction of the rotating shaft 71. When the homogenizing and stirring mechanism is working, the rotation direction of the rotating shaft is the same as the inclined direction of the stirring blades 72, so as to form a centrifugal force offset angle α between the stirring blades 72 and the radial direction of the rotating shaft 71, so as to form a centrifugal force offset angle α between the stirring blades 72 and the radial direction of the rotating shaft 71, so as to enable the fluidized powder to overcome the centrifugal force generated by the stirring blades 72 rotating along the inclined direction. In the figure, the stirring blades 72 are inclined in the counterclockwise rotation direction of the rotating shaft relative to the radial direction of the rotating shaft 71. When the homogenizing and stirring mechanism is working, the rotation direction of the rotating shaft is the same as the inclined direction of the stirring blades 72, so as to form a centrifugal force offset angle α between the stirring blades 72 and the radial direction of the rotating shaft 71 ... Figure 3 For example, the rotating shaft 71 should rotate counterclockwise during operation.
[0032] When the powder fluidized coating device is in use, the driving mechanism is used to drive the rotating shaft 71 to rotate along the inclination direction of the stirring blade 72. The stirring blade 72 is driven to rotate during the rotation of the rotating shaft. The stirring blade 72 generates airflow to rotate along the circumferential direction of the fluidizing chamber 11. At the same time, since a centrifugal force offset angle α is provided between the stirring blade 72 and the radial direction of the rotating shaft 71, the airflow is subjected to a force moving along the stirring blade 72 toward the center of the rotating shaft during the rotation process. This force is used to offset the centrifugal force generated by the stirring blade 72 on the airflow. In this way, the homogenizing stirring mechanism can make the airflow distribution in the area above the stirring blade in the fluidizing chamber 11 more uniform during the working process, which can further reduce the unevenness of the fluidizing surface of the powder fluidized coating device. It should be noted that the powder fluidized coating device is mainly used for spraying cylindrical products whose inner diameter is larger than the outer diameter of the rotating shaft 71, such as the stator of a motor.
[0033] The size of the centrifugal force offset angle α is affected by factors such as the rotation speed of the rotating shaft 71 and the powder characteristics, and the specific value can be obtained through experiments.
[0034] The number of stirring blades has an impact on the homogenization effect and is affected by the rotation speed of the shaft, etc. A suitable value can be obtained through experiments. In the embodiment of the present invention, there are 12 stirring blades.
[0035] It is understandable that in order to achieve the purpose of homogenizing the airflow and improving the flatness of the fluidized surface, the thickness and height of the stirring blade 72 should not be too large. On the premise of meeting the strength requirements, the smaller the thickness of the stirring blade 72, the more conducive to homogenization. The greater the speed of the stirring blade 72 when the shaft is working, the smaller the height of the stirring blade 72 should be. The thickness and height of the stirring blade 72 can be specifically obtained through experiments to obtain an optimal value. Through field experiments, when the shaft speed is 2rpm, the thickness of the stirring blade 72 does not exceed 3mm, and the height is 2-5mm. The mechanism has a good effect on reducing the unevenness of the fluidized surface of the powder fluidization coating device.
[0036] like Figure 3 As shown, the homogenizing and stirring mechanism of the present invention further includes a reinforcing ring 73, wherein the reinforcing ring 73 sleeves the stirring blade 72, and the outer end of the stirring blade 72 is fixedly connected to the reinforcing ring 73. The above structure can increase the strength of the stirring blade 72.
[0037] The present invention is also provided with a stirring drive mechanism 10. To facilitate product spraying, the lower end of the rotating shaft 71 passes downward through the bottom plate 121 and is transmission-connected with the stirring drive mechanism 10. That is, the stirring drive mechanism 10 is arranged below the bottom plate 121 to prevent the stirring drive mechanism 10 from interfering with product spraying.
[0038] It is understandable that a sealing structure should be provided between the fluidizing plate 2 and the rotating shaft and between the fluidizing plate 2 and the inner wall of the chamber 1 to prevent gas from passing through the gap between the fluidizing plate 2 and the rotating shaft and between the fluidizing plate 2 and the chamber 1. In the embodiment of the present invention, seals 8 are provided on both sides of the joints between the fluidizing plate 2 and the rotating shaft and between the fluidizing plate 2 and the chamber 1 for double-layer sealing, and the seals 8 are compressed by the pressing block 9 to achieve sealing. The pressing block can be formed by the side plate of the chamber 1 in sections, or it can be provided separately.
[0039] In order to prevent the fluidized powder from getting wet, the present invention provides an openable and closable dustproof shielding door 13 above the cavity 1 .
Claims
1. Powder fluidized coating device, characterized in that: The invention comprises a cylindrical cavity (1), and a fluidizing plate (2) arranged horizontally in the cavity (1) and dividing the cavity (1) into a fluidizing cavity (11) and a gas storage cavity (12) arranged vertically; a sealing bottom plate (121) is provided at the bottom of the gas storage cavity (12); a vent hole (1211) communicating with the gas storage cavity (12) is provided on the gas storage cavity (12); and a uniform flow structure is provided in the gas storage cavity (12) for uniformly distributing the gas in the gas storage cavity (12).
2. The powder fluidization coating device according to claim 1, characterized in that: The vent holes (1211) are vertically arranged on the bottom plate (121), and there are a plurality of vent holes (1211) arranged at intervals around the center of the bottom plate (121); The uniform flow structure comprises a first ring plate (3), a second ring plate (4), a disc-shaped reflow plate (5), and a mesh plate (6) which is horizontally arranged in the air storage cavity (12) and divides the air storage cavity (12) into an upper air storage cavity (122) and a lower air storage cavity (123) arranged in an upper and lower manner; the first ring plate (3), the second ring plate (4), and the disc-shaped reflow plate (5) are all arranged in the lower air storage cavity (123); the first ring plate (3) is arranged above the ring formed by the air vent (1211) to block the air flow of the air vent (1211) from flowing upward; the second ring plate (4) is horizontally arranged above the first ring plate (3), and the outer edge is sealed and connected to the inner wall of the lower air storage cavity (123), and the inner edge is located on the outer side of the first ring plate (3); the disc-shaped reflow plate (5) is horizontally arranged above the first ring plate (3) and is located on the inner side of the first ring plate (3).
3. The powder fluidization coating device according to claim 2, characterized in that: The second ring plate (4) and the disc-shaped return plate (5) are arranged at the same height.
4. The powder fluidization coating device according to claim 2 or 3, characterized in that: The inner end of the second ring plate (4) and the outer end of the disc-shaped return plate (5) are both provided with an inclined portion (41) inclined downward.
5. The powder fluidization coating device according to claim 2, characterized in that: The ventilation holes (1211) are evenly arranged around the center of the bottom plate (121).
6. The powder fluidization coating device according to claim 1 or 2, characterized in that: The bottom of the fluidizing chamber (11) is provided with a homogenizing and stirring mechanism which causes the airflow to rotate along the circumferential direction of the fluidizing chamber (11) and thereby improves the flatness of the fluidizing surface.
7. The powder fluidization coating device according to claim 6, characterized in that: The homogenizing stirring mechanism comprises a rotating shaft (71) and a plurality of stirring blades (72) uniformly arranged along the circumference of the rotating shaft (71); the rotating shaft (71) is vertically arranged at the center of the fluidizing chamber (11); the stirring blades (72) are arranged on the same horizontal plane and are respectively inclined in the same rotation direction relative to the radial direction of the rotating shaft (71) so as to form a centrifugal force offset angle between the stirring blades (72) and the radial direction of the rotating shaft (71) so as to enable the fluidized powder to overcome the stirring centrifugal force generated by the stirring blades (72) rotating along the inclined direction thereof.
8. The powder fluidization coating device according to claim 7, characterized in that: When the rotation speed of the rotating shaft (71) is 2 rpm, the thickness of the stirring blade (72) does not exceed 3 mm, and the height is between 2 and 5 mm.
9. The powder fluidization coating device according to claim 7 or 8, characterized in that: The homogenizing and stirring mechanism further comprises a reinforcing ring (73), wherein the reinforcing ring (73) sleeves the stirring blade (72), and the outer end of the stirring blade (72) is fixedly connected to the reinforcing ring (73).
10. The powder fluidization coating device according to claim 7, characterized in that: It also comprises a stirring driving mechanism (10), and the lower end of the rotating shaft (71) passes downward through the bottom plate (121) and is drivingly connected to the stirring driving mechanism (10).