Multi-stage screening device for powder coating production

Abstract

The utility model discloses a multistage screening device for powder coating production, and relates to the technical field of powder coating screening, the multistage screening device comprises an outer box, a discharging pipeline assembly is fixedly connected in the outer box, and the top of the discharging pipeline assembly is fixedly connected with a screening device; the screening device comprises three layers of screens which are fixed to the top of the discharging pipeline assembly and distributed in a concentric circle structure, the three layers of screens are lowered towards the side in a step shape, and the tops of the screens are slidably connected with scraping plates. According to the multi-stage screening device for powder coating production, through the design that the three layers of screens are arranged in a stepped mode, the screen layers are gradually lowered, the powder coating can naturally move outwards and downwards along the stepped inclined surfaces in the screening process, powder is prevented from staying and accumulating at the top ends of the screens for a long time, and the mobility of the powder is improved through the structure; the powder is more uniformly distributed on the screen, the cleaning difficulty is reduced, and the maintenance efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of powder coating screening technology, specifically a multi-stage screening device for powder coating production. Background Technology

[0002] Powder coating is a coating material that exists in the form of solid powder. It is mainly composed of resin, curing agent, pigment and additives. In its production process, the particles in the powder need to be classified according to particle size by sieving to remove impurities that are too large or too small, so as to obtain powder with uniform particle size that meets the process requirements.

[0003] To achieve the above functions, a prior art Chinese patent (publication number: CN221361176U) discloses a multi-stage screening device for raw materials used in powder coating production. This device includes a screening box with a door and a support frame. The support frame is fixedly connected to the outside of the screening box. A fixed frame is symmetrically connected to the inner wall of the screening box, and a screening assembly is located between the two fixed frames. A feed hopper is connected to the upper surface of the screening box, and a flip-type shielding structure is provided inside the feed hopper. A support pad is symmetrically connected to the lower surface of the support frame, and an adjustment structure is provided on the support pad. The flip-type shielding structure includes a shielding plate, a connecting block, a connecting rod, a rod groove, and a crank handle. This invention, by setting a flip-type shielding structure, effectively shields the raw materials after they are fed into the screening box through the feed hopper, preventing dust generated during the screening process from being dispersed into the air through the feed hopper and inhaled by workers, thus avoiding any impact on their health.

[0004] While existing technologies can overcome the shortcomings mentioned above, other problems still exist in their operation: powder coatings are generally screened through multiple layers of screens during the screening process. Since the screens are generally vertically distributed, powder coatings tend to accumulate on top and are difficult to clean. At the same time, the continuity of powder coating screening is poor. Utility Model Content

[0005] The purpose of this invention is to provide a multi-stage screening device for powder coating production, which solves the problems in the background art where the screens are generally vertically distributed, making it easy for powder coating to accumulate on top and difficult to clean, and also resulting in poor continuity of powder coating screening.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage screening device for powder coating production, comprising an outer casing, wherein a discharge pipe assembly is fixedly connected inside the outer casing, and a screening device is fixedly connected to the top of the discharge pipe assembly;

[0007] The screening device includes a screen fixed to the top of the discharge pipe assembly and arranged in a concentric circle structure. The screen has three layers, and the three layers of screen decrease towards the sides in a stepped manner. A scraper is slidably connected to the top of the screen.

[0008] Preferably, each layer of the screen is fixedly connected to an annular isolation net on its outer side, and the gap inside the isolation net is larger than the screen hole size of the next level screen. The top of the outer box is fixedly connected to a feed inlet, which is aligned with the screen located in the center.

[0009] Preferably, the discharge pipe assembly includes three layers of collection troughs, and each collection trough is aligned with the bottom of the screen of the corresponding layer. The discharge pipe assembly also includes a collection pipe, which is fixedly connected to the bottom of the screen located at the center.

[0010] Preferably, a second discharge pipe is provided on one side of the collection trough, and the second discharge pipe extends to the outside of the outer box. The bottom of the collection trough is provided with an inclined structure, and the inclination direction gradually decreases from the side away from the second discharge pipe to the side closer to the second discharge pipe.

[0011] Preferably, the bottom of the collecting pipe is configured as a funnel-shaped structure, and a first discharge pipe extending to the bottom of the outer box is fixedly connected to the bottom of the collecting pipe.

[0012] Preferably, a fixing box is fixedly connected to the bottom of the screen, and a motor is installed inside the fixing box, with a drive shaft drivingly connected to the output end of the motor.

[0013] Preferably, a tapered material distribution block is fixedly connected to the top of the drive shaft, and a scraper is fixedly connected along the tangential direction of the outer side of the material distribution block. The bottom of the scraper is set as a stepped structure that matches the stepped shape of the screen, and a reserved groove is provided on the inner side of the scraper to slide with the isolation screen.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This multi-stage screening device for powder coating production uses a three-layer stepped screen design. This design allows the screen layers to gradually decrease in height, enabling the powder coating to move naturally outward and downward along the inclined surfaces of the steps during the screening process. This avoids the powder from remaining and accumulating at the top of the screen for a long time. The structure increases the flowability of the powder, making the powder distribution on the screen more uniform, reducing the difficulty of cleaning, and improving maintenance efficiency.

[0016] The scraper drives the powder to slide along the screen surface and push it to the outside, effectively preventing the powder from stagnating or accumulating, ensuring the continuous movement of the material on the screen, realizing continuous screening of powder coatings, significantly improving screening efficiency and the processing capacity of the device, while reducing secondary blockage of materials and the need for human intervention, ensuring the stability and smoothness of the screening process. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a schematic cross-sectional view of the present invention.

[0019] Figure 3 This is a schematic diagram of the material discharge pipe assembly of this utility model;

[0020] Figure 4 This is a schematic diagram of the fixing box structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the screen structure of this utility model;

[0022] Figure 6 This is a schematic diagram of the scraper structure of this utility model.

[0023] In the diagram: 1. Outer casing; 2. Discharge pipe assembly; 3. Screen; 4. Isolation net; 5. Scraper; 6. Collection trough; 7. Collection pipe; 8. First discharge pipe; 9. Second discharge pipe; 10. Fixing box; 11. Motor; 12. Drive shaft; 13. Material distribution block; 14. Reserved slot; 15. Feed inlet. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1: Please refer to Figure 1 - Figure 6This utility model provides the following technical solution: A multi-stage screening device for powder coating production, comprising an outer casing 1, a discharge pipe assembly 2 fixedly connected inside the outer casing 1, and a screening device fixedly connected to the top of the discharge pipe assembly 2; the screening device includes screens 3 arranged in a concentric circle structure fixed to the top of the discharge pipe assembly 2, the screens 3 having three layers, and the three layers of screens 3 decreasing towards the sides in a stepped manner, with scrapers 5 slidably connected to the top of the screens 3; an annular isolation net 4 fixedly connected to the outside of each layer of screens 3, and the gap size inside the isolation net 4 being larger than the screen hole size of the next level screen 3; a feed inlet 15 fixedly connected to the top of the outer casing 1, and the feed inlet 15 being aligned with the screen 3 located in the center; the discharge pipe assembly 2 includes three layers of collecting troughs 6, and each collecting trough 6 is aligned with the bottom of the corresponding layer of screens 3; the discharge pipe assembly 2 also includes a collecting pipe 7, and The collecting pipe 7 is fixedly connected to the bottom of the screen 3 located in the center; a second discharge pipe 9 is provided on one side of the collecting trough 6, and the second discharge pipe 9 extends to the outside of the outer box 1. The bottom of the collecting trough 6 is set with an inclined structure, and the inclined direction gradually decreases from the side away from the second discharge pipe 9 to the side close to the second discharge pipe 9; the bottom of the collecting pipe 7 is set with a funnel-shaped structure, and a first discharge pipe 8 extending to the bottom of the outer box 1 is fixedly connected to the bottom of the collecting pipe 7; a fixed box 10 is fixedly connected to the bottom of the screen 3, and a motor 11 is installed inside the fixed box 10. The output end of the motor 11 is connected to a drive shaft 12; a tapered material equalization block 13 is fixedly connected to the top of the drive shaft 12, and a scraper 5 is fixedly connected along the tangential direction of the outer side of the material equalization block 13. The bottom of the scraper 5 is set with a stepped structure that matches the stepped shape of the screen 3, and a reserved groove 14 for sliding cooperation with the isolation net 4 is provided on the inner side of the scraper 5.

[0026] First, the powder coating is fed into the outer box 1 through the feed inlet 15. The feed inlet 15 is aligned with the screen 3 in the center of the equipment. After the powder coating enters, it comes into contact with the conical material distribution block 13 located at the top of the screen. The material distribution block 13 uses its conical design to ensure that the powder coating is evenly distributed on the top of the screen 3, thus ensuring the uniformity and efficiency of screening.

[0027] After the motor 11 is started, the drive shaft 12 rotates and drives the material distribution block 13 to rotate synchronously. When the material distribution block 13 rotates, it drives the scraper 5, which is fixed along the tangential direction on its outer side, to slide. The scraper 5 slides on the top of the screen 3 and forms a motion trajectory that matches the stepped structure of the screen. The scraper 5 pushes the powder coating at an acute angle, which not only drives the powder coating to rotate along the circumference of the screen, but also pushes the powder coating to move to the outside of the screen, so as to make the powder more fully screened.

[0028] During the movement of the screen 3, the powder coating, according to the particle size matching the screen hole size, enters the discharge pipe assembly 2 through the screen holes of the corresponding screen layer. Among them, the powder screened by the screen 3 located in the center falls directly into the collection pipe 7. The funnel-shaped structure at the bottom of the collection pipe 7 guides the powder to the connected first discharge pipe 8 for discharge. The powder screened by the outer screen layers enters the corresponding collection tank 6. Each collection tank 6 adopts a design with the bottom inclined towards the second discharge pipe 9, so that the powder flows naturally along the inclined surface and is discharged through the second discharge pipe 9, realizing the stratified collection and classification of powders with different particle sizes.

[0029] During the overall screening process, the isolation net 4 is set on the outside of each layer of screen 3 to prevent powder from mixing into adjacent screen layers. Its gap is designed to be larger than the screen holes of the next layer to ensure that the powder smoothly transitions to the next level screen. The scraper 5 is provided with a reserved groove 14 that slides with the isolation net 4 to ensure that the scraper does not get stuck with the isolation net when rotating and pushing the powder, thus maintaining the stable operation of the screening device.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-stage screening device for powder coating production, comprising an outer box (1), a discharge pipeline assembly (2) fixedly connected inside the outer box (1), and a screening device fixedly connected to the top of the discharge pipeline assembly (2); characterized in that The screening device comprises a screen (3) fixedly connected to the top of the discharge pipeline assembly (2) in a concentric circle structure, the screen (3) has three layers, and the three layers of the screen (3) are arranged in a stepped manner to the side, and a scraper (5) is slidably connected to the top of the screen (3).

2. The multi-stage screening device for powder coating production according to claim 1, characterized in that: An isolation net (4) in an annular structure is fixedly connected to the outer side of each layer of the screen (3), and the gap in the isolation net (4) is larger than the screen hole size of the next stage screen (3), the outer box (1) is fixedly connected with a feeding port (15) at the top, and the feeding port (15) is aligned with the screen (3) located at the center.

3. The multi-stage screening device for powder coating production according to claim 1, characterized in that: The discharge pipeline assembly (2) comprises three layers of collecting tanks (6), and each collecting tank (6) is aligned with the bottom of the corresponding layer of the screen (3), and the discharge pipeline assembly (2) further comprises a collecting pipe (7) fixedly connected to the bottom of the screen (3) located at the center.

4. The multi-stage screening device for powder coating production according to claim 3, characterized in that: One side of the collecting tank (6) is provided with a second discharge pipe (9) extending to the outside of the outer box (1), and the bottom of the collecting tank (6) is provided in an inclined structure, and the inclined direction gradually decreases from the side away from the second discharge pipe (9) to the side close to the second discharge pipe (9).

5. The multi-stage screening device for powder coating production according to claim 4, characterized in that: The bottom of the collecting pipe (7) is provided in a funnel-shaped structure, and the bottom of the collecting pipe (7) is fixedly connected with a first discharge pipe (8) extending to the bottom of the outer box (1).

6. The multi-stage screening device for powder coating production according to claim 1, characterized in that: The bottom of the screen (3) is fixedly connected with a fixed box (10), and a motor (11) is installed in the fixed box (10), and a drive shaft (12) is drivingly connected to the output end of the motor (11).

7. The multi-stage screening device for powder coating production according to claim 6, characterized in that: The top of the drive shaft (12) is fixedly connected with a conical material uniforming block (13), and the scraper (5) is fixedly connected along the tangential direction of the outside of the material uniforming block (13), the bottom of the scraper (5) is provided in a stepped structure matched with the stepped screen (3), and the inside of the scraper (5) is provided with a reserved groove (14) slidably matched with the isolation net (4).

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