Powder fluidization coating device
By introducing a uniform flow structure and a stirring mechanism into the powder fluidized coating device, the problem of uneven airflow distribution in the fluidized plate was solved, achieving a higher quality coating effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-04-07
AI Technical Summary
In existing powder fluidized bed coating equipment, the airflow distribution of the fluidizing plate is uneven, resulting in an uneven fluidized surface and affecting the coating quality.
It adopts a cylindrical cavity design, combined with a uniform flow structure and a homogenizing stirring mechanism, including a first ring plate, a second ring plate, a disc-shaped return plate and a mesh plate in the uniform flow structure. Through the uniform distribution of airflow, combined with the design of stirring blades and rotating shaft, it achieves uniform rotation and distribution of airflow.
It improves the smoothness of the fluidized surface, reduces unevenness, and enhances the quality of the coated products.
Smart Images
Figure CN224087241U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to powder coating technical field, concretely is a kind of powder fluidization coating device. BACKGROUND
[0002] Powder fluidization coating is a kind of surface coating technology widely used in industrial field, mainly used for the corrosion protection, decoration and functional treatment of metal, plastic and other materials. Its principle is to store dry fine powder on fluidization plate, and to pass compressed gas below the fluidization plate, the compressed gas is blown out from the fluidization hole of the fluidization plate, so that the powder is suspended on the fluidization plate to form a fluid-like state, and then the powder is uniformly coated on the surface of workpiece by electrostatic adsorption or hot melt coating.
[0003] In powder fluidization coating, the fluidization surface refers to the surface on which the powder particles are suspended and form a fluid-like state under the action of air flow in the fluidization coating equipment. Specifically, the fluidization surface is the dynamic interface formed after the powder particles are mixed with air in the fluidization coating equipment. Unevenness of the fluidization surface will cause the coated surface of the product to be wavy, affecting the quality of the product. The powder fluidization coating device generally directly passes compressed gas into the gas storage cavity below the fluidization plate. Due to the flow inertia and other factors after the compressed gas is passed in, there is a certain difference in gas pressure at different positions in the gas storage cavity, which will cause the gas distribution at different positions to be different when the gas passes through the fluidization plate. The gas flow through some fluidization holes is large, and the gas flow through some fluidization holes is small. The device has the problem of uneven gas flow distribution of the fluidization plate, which will cause the fluidization surface to be uneven, and it is difficult to meet the coating requirements of high-quality products. SUMMARY
[0004] The technical problem to be solved by the utility model is to provide a powder fluidization coating device that can make the gas flow distribution of the fluidization plate more uniform.
[0005] The technical solution adopted by the utility model to solve its technical problem is: a powder fluidization coating device, including a cylindrical cavity, and a fluidization plate horizontally arranged in the cavity and separating the cavity into a fluidization cavity and a gas storage cavity arranged above and below; the bottom of the gas storage cavity is provided with a bottom plate for sealing, the gas storage cavity is provided with a gas passage hole communicating with the gas storage cavity, and the gas storage cavity is provided with a uniform flow structure for uniformly distributing the gas in the gas storage cavity.
[0006] Further, the gas passage hole is vertically arranged on the bottom plate, the gas passage hole is a plurality of and is arranged around the center of the bottom plate at intervals;
[0007] The uniform flow structure comprises a first ring plate, a second ring plate, a disc-shaped reflux plate, and a mesh plate horizontally arranged in the gas storage cavity and separating the gas storage cavity into an upper gas storage cavity and a lower gas storage cavity arranged in an upper and lower manner; the first ring plate, the second ring plate, and the disc-shaped reflux plate are all arranged in the lower gas storage cavity, the first ring plate is arranged above the annular shape enclosed by the air holes to block the straight upward flow of the air flow of the air holes, the second ring plate is horizontally arranged above the first ring plate, and the outer edge is in sealing connection with the inner wall of the lower gas storage cavity, and the inner edge is located outside the first ring plate, and the disc-shaped reflux plate is horizontally arranged above the first ring plate and located inside the first ring plate.
[0008] Further, the second ring plate and the disc-shaped reflux plate are arranged at the same height.
[0009] Further, the inner end of the second ring plate and the outer end of the disc-shaped reflux plate are both provided with inclined portions inclined downward.
[0010] Further, the air holes are uniformly arranged around the center of the bottom plate.
[0011] Further, the bottom of the fluidization cavity is provided with a uniformization stirring mechanism for rotating the air flow in the circumferential direction of the fluidization cavity, thereby improving the flatness of the fluidization surface.
[0012] Further, the uniformization stirring mechanism comprises a rotating shaft and a plurality of stirring blades uniformly arranged in the circumferential direction of the rotating shaft, the rotating shaft is vertically arranged at the center of the fluidization cavity, the stirring blades are arranged in the same horizontal plane and are respectively arranged in the same rotating 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, which offsets the stirring centrifugal force generated by the stirring blades rotating in the inclined direction thereof.
[0013] Further, when the rotating speed of the rotating shaft is 2 rpm, the thickness of the stirring blades is not more than 3 mm, and the height is 2-5 mm.
[0014] Further, the uniformization stirring mechanism further comprises a reinforcing ring, the reinforcing ring is sleeved on the stirring blades, and the outer end of the stirring blades is fixedly connected with the reinforcing ring.
[0015] Further, a stirring driving mechanism is further included, and the lower end of the rotating shaft penetrates downward through the bottom plate and is in transmission connection with the stirring driving mechanism.
[0016] The powder fluidization coating device has the advantages that: the uniform flow structure is arranged in the gas storage cavity 12 to uniformly distribute the gas in the gas storage cavity 12, the gas flow is more uniformly distributed below the fluidization plate 2 through the uniform flow structure, the gas flow is more uniformly passed through the fluidization plate, the distribution of the fluidization gas flow on the fluidization plate is more uniform, the unevenness of the fluidization surface of the powder fluidization coating device is reduced, the flatness of the fluidization surface during the working process of the device is larger, and the quality of the sprayed product is improved. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is a structural schematic view of the utility model;
[0018] Figure 2 is a structural schematic view of the uniform flow structure;
[0019] Figure 3 is a top view of the utility model;
[0020] The figure shows: cavity 1, fluidization plate 2, first ring plate 3, second ring plate 4, disc-shaped backflow plate 5, mesh plate 6, sealing element 8, pressing block 9, stirring drive mechanism 10, fluidization cavity 11, gas storage cavity 12, dustproof shielding door 13, inclined portion 41, rotating shaft 71, stirring blade 72, reinforcing ring 73, bottom plate 121, upper gas storage cavity 122, lower gas storage cavity 123, air vent 1211. DETAILED DESCRIPTION
[0021] The utility model is further described below in combination with the drawings and examples.
[0022] As Figure 1 , Figure 2 shown, the powder fluidization coating device of the utility model, including cylindrical cavity 1, and horizontally arranged in the fluidization plate 2 of the cavity 1 and the cavity 1 is divided into the fluidization cavity 11 and the gas storage cavity 12 of the upper and lower arrangement of the fluidization plate 2. The bottom of the gas storage cavity 12 is provided with the bottom plate 121 for closing, the gas storage cavity 12 is provided with the air vent 1211 that communicates with the gas storage cavity 12, the gas storage cavity 12 is provided with the uniform flow structure that makes the gas in the gas storage cavity 12 evenly distributed.
[0023] The air vent 1211 can be arranged on the bottom plate or side wall of the gas storage cavity 12. In the utility model embodiment, as shown in Figure 1 And Figure 2 shown, the air vent 1211 is vertically arranged on the bottom plate 121, and the air vent 1211 is multiple (at least 2) and is arranged at intervals around the center of the bottom plate 121. The air vent 1211 is preferably uniformly arranged around the center of the bottom plate 121. The more the number of air vents 1211, the more conducive to making the gas in the gas storage cavity 12 more evenly distributed.
[0024] As Figure 1 and Figure 2 shown, when the vent hole 1211 is vertically arranged on the bottom plate 121, the vent hole 1211 is multiple and arranged at intervals around the center of the bottom plate 121, in the embodiment of the utility model, the flow uniformizing structure includes first ring plate 3, second ring plate 4, disc-shaped reflux plate 5 and mesh plate 6 horizontally arranged in the gas storage cavity 12 and separating the gas storage cavity 12 into upper and lower arranged upper gas storage cavity 122 and lower gas storage cavity 123;The first ring plate 3, second ring plate 4 and disc-shaped reflux plate 5 are all arranged in the lower gas storage cavity 123, the first ring plate 3 is arranged above the annulus enclosed by the vent hole 1211 to block the upward straight flow of the airflow of the vent hole 1211, the second ring plate 4 is horizontally arranged above the first ring plate 3, and the outer edge is sealingly connected with the inner wall of the lower gas storage cavity 123, and the inner edge is located on the outside of the first ring plate 3, the disc-shaped reflux plate 5 is horizontally arranged above the first ring plate 3 and located on the inside of the first ring plate 3.
[0025] When compressed air is vertically introduced into the gas storage cavity 12 through the vent hole 1211, the airflow is blocked under the action of the first ring plate 3, the airflow cannot flow upward, and the airflow is shunted to both sides of the first ring plate 3. The airflow shunted to the outside of the first ring plate 3 is refluxed to the direction of the first ring plate 3 under the action of the second ring plate 4 and the cavity wall, and the airflow shunted to the inside of the first ring plate 3 is refluxed to the direction of the first ring plate 3 under the action of the disc-shaped reflux plate 5, the two refluxed airflows collide and mix with each other, forming turbulent flow, thereby achieving the purpose of better homogenizing and dispersing 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 uniformly distributed below the fluidization plate 2, i.e. in the upper gas storage cavity 122, and the airflow distribution of the fluidization plate can be more uniform, which can reduce the unevenness of the fluidization surface of the powder fluidization coating device and increase the flatness of the fluidization surface during the operation of the device.
[0026] The outer edge of the second ring plate 4 can be sealingly connected with the inner wall of the lower gas storage cavity 123 by a sealing ring or by full welding connection and the like.
[0027] The mesh plate 6 can adopt a mesh plate with a pore size distribution consistent with that of the fluidization plate 2, or a mesh plate with a larger pore size than the fluidization plate 2. The more the mesh number of the mesh plate 6 is, the more conducive to the homogenization of the airflow, but the greater the resistance and pressure reduction effect on the airflow, which requires higher pressure compressed gas.
[0028] In some embodiments, the flow uniformizing structure is multiple mesh plates arranged above the vent hole 1211, which makes the airflow more uniformly and dispersedly pass into the lower side of the fluidization plate 2 by the resistance of the mesh plate and the shunting of the mesh holes. This kind of structure will cause a larger pressure loss of the compressed gas.
[0029] The second ring plate 4 and the disc-shaped reflux plate 5 can be arranged at the same height or different heights.
[0030] The second ring plate 4 and the disc-shaped reflux plate 5 can be arranged at the same height or different heights. Figure 2 )。
[0031] The bottom of the fluidization cavity 11 is provided with a uniformizing stirring mechanism for rotating the gas flow along the circumferential direction of the fluidization cavity 11, thereby improving the flatness of the fluidization surface. Figure 2 and Figure 3 As shown in the drawings, the uniformizing stirring mechanism comprises a rotating shaft 71 and a plurality of stirring blades 72 arranged along the circumferential direction of the rotating shaft 71, the rotating shaft 71 is vertically arranged at the center of the fluidization cavity 11, the stirring blades 72 are arranged on the same horizontal plane and are arranged to be inclined to the same rotating direction relative to the radial direction of the rotating shaft 71, so as to form a centrifugal force offset angle a between the stirring blades 72 and the radial direction of the rotating shaft 71, which offsets the stirring centrifugal force generated by the stirring blades 72 rotating along the inclined direction. In the drawings, the stirring blades 72 are inclined to the counterclockwise rotating direction of the rotating shaft 71. When the uniformizing stirring mechanism works, the rotating direction of the rotating shaft is the same as the inclined direction of the stirring blades 72, for example, the rotating shaft 71 should rotate counterclockwise. Figure 3
[0032] When the powder fluidization coating device is used, the rotating shaft 71 is driven to rotate along the inclined direction of the stirring blades 72 by the driving mechanism, and the rotating shaft drives the stirring blades 72 to rotate during rotation. The stirring blades 72 rotate to rotate the gas flow along the circumferential direction of the fluidization cavity 11, and at the same time, the centrifugal force offset angle a is arranged between the stirring blades 72 and the radial direction of the rotating shaft 71, so that the gas flow will be subjected to a force moving along the stirring blades 72 to the center of the rotating shaft during rotation. The force is used to offset the centrifugal force generated by the stirring blades 72 to the gas flow, so that the uniformizing stirring mechanism can make the gas flow in the area above the stirring blades in the fluidization cavity 11 more uniform during work, and can further reduce the unevenness of the fluidization surface of the powder fluidization coating device. It should be noted that the powder fluidization coating device is mainly used for spraying cylindrical products with an inner diameter greater than the outer diameter of the rotating shaft 71, such as a stator of a motor.
[0033] The size of the centrifugal force offset angle a is affected by the rotating speed of the rotating shaft 71 during work and the characteristics of the powder, and the specific value can be obtained by experiment.
[0034] The number of stirring blades has an influence on the homogenization effect, which is affected by the rotating speed of the rotating shaft, and a suitable value can be obtained through experiments.
[0035] It can be understood that, in order to achieve the purpose of homogenizing the airflow and improving the flatness of the fluidization surface, the thickness and height of the stirring blade 72 should not be too large. Under the premise of meeting the strength requirement, the smaller the thickness of the stirring blade 72 is, the more conducive to homogenization. The height of the stirring blade 72 should be smaller when the rotating speed of the rotating shaft is larger. The thickness and height of the stirring blade 72 can be obtained through experiments. Through field experiments, when the rotating speed of the rotating shaft is 2 rpm, the thickness of the stirring blade 72 is not more than 3 mm, and the height is 2-5 mm, the mechanism has a good effect on reducing the unevenness of the fluidization surface of the powder fluidization coating device.
[0036] As shown in Figure 3 The homogenization stirring mechanism further comprises a reinforcing ring 73, the stirring blade 72 is sleeved in the reinforcing ring 73, and the outer end of the stirring blade 72 is fixedly connected with the reinforcing ring 73. The above structure can increase the strength of the stirring blade 72.
[0037] The utility model further has a stirring driving mechanism 10, in order to facilitate product spraying, the lower end of rotating shaft 71 passes bottom plate 121 and stirring driving mechanism 10 transmission connection downwards. Namely, the stirring driving mechanism 10 is arranged below the bottom plate 121 to avoid the stirring driving mechanism 10 to hinder product spraying.
[0038] It can be understood that the sealing structure should be arranged between the fluidization plate 2 and the rotating shaft and between the fluidization plate 2 and the inner wall of the cavity 1 to avoid the gas passing through the gap between the fluidization plate 2 and the rotating shaft and between the fluidization plate 2 and the cavity 1. In the utility model embodiment, the sealing element 8 is arranged on both sides of the joint between the fluidization plate 2 and the rotating shaft and between the fluidization plate 2 and the cavity 1 to realize double-layer sealing, and the sealing element 8 is compressed and sealed by the pressing block 9. The pressing block can be formed in segments by the side plate of the cavity 1 or separately arranged.
[0039] In order to prevent the fluidized powder from being damp, the utility model is provided with a dustproof shielding door 13 which can be opened and closed above the cavity 1.
Claims
1. A powder fluidized bed coating apparatus, characterized in that: It includes 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; the bottom of the gas storage cavity (12) is provided with a sealing bottom plate (121), the gas storage cavity (12) is provided with a vent (1211) communicating with the gas storage cavity (12), and the gas storage cavity (12) is provided with a uniform flow structure to make the gas in the gas storage cavity (12) evenly distributed.
2. The powder fluidized bed coating apparatus as described in claim 1, characterized in that: The ventilation holes (1211) are vertically arranged on the base plate (121). There are multiple ventilation holes (1211), which are arranged at intervals around the center of the base plate (121). The uniform flow structure includes a first ring plate (3), a second ring plate (4), a disc-shaped return flow plate (5), and a perforated plate (6) horizontally disposed in the gas storage cavity (12) and dividing the gas storage cavity (12) into an upper gas storage cavity (122) and a lower gas storage cavity (123) arranged vertically. The first ring plate (3), the second ring plate (4), and the disc-shaped return flow plate (5) are all disposed in the lower gas storage cavity (123). The first ring plate (3) is disposed above the annulus formed by the vent (1211) to block the airflow of the vent (1211) from flowing upwards. The second ring plate (4) is horizontally disposed above the first ring plate (3), and its outer edge is sealed to the inner wall of the lower gas storage cavity (123), while its inner edge is located outside the first ring plate (3). The disc-shaped return flow plate (5) is horizontally disposed above the first ring plate (3) and located inside the first ring plate (3).
3. The powder fluidized bed coating apparatus as described in claim 2, characterized in that: The second ring plate (4) and the disc-shaped return plate (5) are set at the same height.
4. The powder fluidized bed coating apparatus as described in 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 downward inclined portions (41).
5. The powder fluidized bed coating apparatus as described in claim 2, characterized in that: The ventilation holes (1211) are evenly arranged around the center of the base plate (121).
6. The powder fluidized bed coating apparatus as described in claim 1 or 2, characterized in that: The bottom of the fluidization chamber (11) is provided with a homogenizing and stirring mechanism that causes the airflow to rotate in the circumferential direction of the fluidization chamber (11), thereby improving the smoothness of the fluidization surface.
7. The powder fluidized bed coating apparatus as described in claim 6, characterized in that: The homogenizing and stirring mechanism includes a rotating shaft (71) and multiple stirring blades (72) uniformly arranged circumferentially along the rotating shaft (71). The rotating shaft (71) is vertically arranged at the center of the fluidization 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 cancellation angle between the stirring blades (72) and the radial direction of the rotating shaft (71) so that the fluidized powder overcomes the stirring centrifugal force generated by the stirring blades (72) rotating in their inclined direction.
8. The powder fluidized bed coating apparatus as described in claim 7, characterized in that: When the rotational speed of the 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 fluidized bed coating apparatus as described in claim 7 or 8, characterized in that: The homogenizing and stirring mechanism also includes a reinforcing ring (73), which sleeves the stirring blade (72) inside, and the outer end of the stirring blade (72) is fixedly connected to the reinforcing ring (73).
10. The powder fluidized bed coating apparatus as described in claim 7, characterized in that: It also includes a stirring drive mechanism (10), the lower end of the rotating shaft (71) passes downward through the base plate (121) and is connected to the stirring drive mechanism (10) for transmission.