A coated vibrating screen for titanium dioxide and a screening method thereof

Abstract

The present application relates to the technical field of enveloped vibrating screen, and particularly relates to an enveloped vibrating screen for titanium dioxide and a screening method thereof, which comprises a fixed base, supporting springs, a protective shell, a re-screening mechanism, a driving motor, a vibrating screen machine, a bottom outlet and a vibrating screen assembly; the supporting springs are installed at four corners of the fixed base, the protective shell is installed above the supporting springs, the re-screening mechanism is installed on the side of the protective shell, the re-screening mechanism is used for re-screening the material after the initial screening under the driving of the driving motor, the driving motor is installed above the re-screening mechanism, the vibrating screen machine is installed on both sides of the protective shell, the bottom outlet is arranged below the protective shell, and the vibrating screen assembly is installed inside the protective shell, the vibrating screen assembly is used for initially screening the mixed material and outputting small-particle material downwards.

Description

Technical Field

[0001] This invention relates to the field of coated vibrating screen technology, and specifically to a coated vibrating screen for titanium dioxide and its screening method. Background Technology

[0002] Titanium dioxide is an important white pigment and filler, widely used in coatings, plastics, inks, paper, rubber, cosmetics, and other industries. The main raw material for titanium dioxide is titanium ore, and its preparation mainly involves two processes: the sulfate process and the chloride process. The sulfate process primarily includes methods using titanate sulfate and zirconium titanate, while the chloride process mainly includes methods using titanium chloride and ferrous sulfate. Titanium dioxide has two main crystal structures: anatase (R-type) and rutile (A-type). These different crystal structures affect the performance and applications of titanium dioxide. The particle size and distribution of titanium dioxide have a significant impact on its performance and applications. Particle size and distribution are typically determined using methods such as particle size analysis. Titanium dioxide often requires surface coating treatment to improve its dispersibility, increase its stability in media, and improve product quality. Titanium dioxide has wide applications in coatings, plastics, inks, and other fields; therefore, related application technologies are also important background technologies. For example, in the coatings field, the dispersibility, hiding power, and gloss of titanium dioxide have a significant impact on the final coating quality. With increasing environmental awareness, environmentally friendly technologies in the production process of titanium dioxide are becoming increasingly important. These include technological innovations in areas such as reducing wastewater discharge and improving resource utilization.

[0003] A coated vibrating screen is a special type of vibrating screening equipment used for screening granular materials. This screening equipment combines vibrating screening technology with coating technology, aiming to improve particle flowability, dispersibility, and screening efficiency. In a coated vibrating screen, a particle sample is placed on a vibrating screen, which separates the particles into different sizes through vibration on the screen mesh. Unlike traditional vibrating screens, coated vibrating screens incorporate a coating material during the screening process. The coating material is typically a material that forms a thin film on the particle surface, such as silica. This film improves the surface properties of the particles, such as increasing particle stability, improving particle flowability, and reducing particle aggregation and clogging. This makes it easier for particles to pass through the screen during vibrating screening, improving screening efficiency and accuracy. Coated vibrating screens are commonly used in industries requiring fine separation and precise control of particles, such as chemical, pharmaceutical, and food processing. They can help optimize production processes, improve product quality and performance, and facilitate quality control and assurance. The coated vibrating screen is a high-efficiency screening device that combines vibrating screening and coating technology, providing a more precise and controllable method for screening particulate materials.

[0004] Existing coated vibrating screens require a longer vibration time because they need to be coated on top of traditional vibrating screens. If the vibration is not sufficient, uneven coating can easily occur, which can also affect the vibration effect.

[0005] In view of the above, in order to overcome the above technical problems, the present invention designs a coated vibrating screen for titanium dioxide and a screening method thereof, thus solving the above technical problems. Summary of the Invention

[0006] The technical objective of this invention is to improve the existing titanium dioxide coating screening machine by setting up a re-screening mechanism and a vibrating screen assembly, thereby improving the screening accuracy through secondary screening and obtaining coated titanium dioxide with more accurate specifications.

[0007] To achieve the above-mentioned technical objectives, the present invention provides the following technical solution:

[0008] This invention provides a coated vibrating screen for titanium dioxide and its screening method, comprising a fixed base, supporting springs, a protective shell, a re-screening mechanism, a drive motor, a vibrating screen, a bottom outlet, and a vibrating screen assembly. The fixed base forms the foundation of the coated vibrating screen for titanium dioxide, providing a stable support structure and ensuring the overall stability of the equipment. The supporting springs are installed at the four corners of the fixed base, providing elastic support for the vibrating screen and reducing the impact of vibration on the external environment. The protective shell is installed on top of the supporting springs to protect the vibrating screen from external environmental influences and contamination. Furthermore, the protective shell also serves a protective function, preventing accidental contact or contact with the operating vibrating screen. The re-screening mechanism is one of the core components of this vibrating screen; it is installed on the side of the protective shell and driven by the drive motor. The re-screening mechanism is responsible for re-screening the material after the initial screening to improve screening efficiency and accuracy. The drive motor is installed above the re-screening mechanism, providing power support for the re-screening process. The drive motor is mounted on top of the re-screening mechanism, and the vibrating screen is mounted on both sides of the protective housing. Particle separation and screening are achieved through vibration. The bottom outlet is located below the protective housing to discharge the screened material. The vibrating screen assembly is installed inside the protective housing for preliminary screening of the mixture and downward output of small particles. This design aims to ensure smooth screening and effectively separate particles of different sizes and shapes.

[0009] The re-screening mechanism includes a screening shell, a limiting chute, a screening plate, a distribution plate, and a rotating assembly. The screening shell is installed on the side of the protective shell and is used to perform secondary screening of the material that has undergone preliminary screening by the vibrating screen assembly in the protective shell. The limiting chute is formed on the inner surface of the screening shell and is used to limit the rotation of the rotating assembly, maintaining its rotational stability. The screening plate and the distribution plate are sequentially installed inside the screening shell. The screening plate is used to perform secondary screening of the material entering the screening shell. The rotating assembly is installed inside the screening shell. The screening shell is designed as a hollow structure, which facilitates the entry and exit of materials. A material inlet is provided on the side of the screening shell near the protective shell, which is used to input the material after primary screening into the re-screening mechanism. A material outlet is provided on the side of the screening shell, and a collection device is provided outside the material outlet to collect and store materials of different particle sizes.

[0010] The screening plate has uniformly distributed screening holes, the diameter of which is the same as that of the inner screen mesh of this layer, thus achieving the same screening effect. The distribution plate has a distribution groove near the protective shell, and this groove is designed as a fan-shaped ring. This fan-shaped design effectively guides particles to the screening area, preventing falling material from exiting directly from the material outlet and further ensuring screening accuracy. The fan-shaped design of the distribution groove allows material to flow evenly into the vibrating screening area, avoiding particle accumulation and clogging, and ensuring the screening effect.

[0011] The rotating assembly includes a rotating shaft, a pushing block, a pushing brush, and a limiting block. The upper end of the rotating shaft is connected to a drive motor. The pushing blocks are arranged in a circumferential array on the side of the rotating shaft. The pushing blocks are used to assist in pushing the material to perform a fine secondary screening process on the material after the initial screening. The pushing brush is installed below the pushing blocks. The pushing brush is used to reduce the problem of coating damage caused by titanium dioxide particles during the screening process. The limiting block is installed on the side of the pushing blocks.

[0012] The horizontal cross-sectional shape of the pusher block is fan-shaped, and its diameter gradually increases outward along the rotation axis. This design allows the particles to be pushed more evenly during the pushing process, avoiding uneven force on the particles during rotation and ensuring uniform particle distribution in the screening area. The vertical cross-sectional shape of the limiting block is an isosceles trapezoid. This design helps limit the movement range of the pusher block, ensuring its stability and accuracy during rotation. The reasonable design of the limiting block can effectively control the movement trajectory of the pusher block, avoiding poor screening results caused by excessive oscillation or misalignment.

[0013] The vibrating screen assembly includes an outer screen, a guard plate, a discharge hole, a distributor bar, and an inner screen. The outer screen is installed inside the protective housing, the guard plate is installed at the inner edge of the outer screen, the discharge hole is located on the side of the guard plate, the distributor bar is installed inside the guard plate, and the inner screen is installed below the distributor bar. The distributor bar is cross-shaped, and the inner screen is a downwardly concave arc shape. The vertical cross-section of the guard plate is a right-angled trapezoid, with its inclined surface positioned close to the distributor bar. This allows for thorough mixing of the titanium dioxide particles and coating material during the initial screening process, ensuring sufficient mixing time. Thorough mixing ensures sufficient contact and mixing between the titanium dioxide particles and the coating material, allowing the coating material to uniformly cover the particle surface, thereby improving the uniformity and consistency of the coating. Thorough mixing allows the coating material to adhere evenly to the surface of the titanium dioxide particles, forming a uniform and complete coating layer. This coating effectively protects titanium dioxide particles, improving their stability and durability. Thorough mixing allows for the formation of a good interface between the titanium dioxide particles and the coating material, reducing inter-particle friction and improving particle flowability and dispersibility. This contributes to improved efficiency and quality in subsequent processing. Sufficient mixing ensures optimal matching of the physical and chemical properties between the coating material and the titanium dioxide particles. This optimizes product performance, enhancing product quality and competitiveness.

[0014] A method for coating and sieving titanium dioxide, wherein the method is used in the aforementioned coated vibrating screen for titanium dioxide; the steps of the method for coating and sieving titanium dioxide are as follows:

[0015] S1: Select appropriate outer and inner screens according to actual needs, install the selected outer and inner screens onto the vibrating screen assembly, and ensure that the outer and inner screens are clean and intact, without any damage or blockage.

[0016] S2: Simultaneously place the prepared titanium dioxide and coating material into the hopper above the protective shell to complete the feeding work, close the hopper switch, start the vibrating screen, and adjust the amplitude and frequency to ensure appropriate screening and coating effects;

[0017] S3: Vibration will cause particles to separate on the outer and inner screens, passing through different outer and inner screens depending on their size;

[0018] S4: A portion of the raw material will enter the re-screening mechanism. The drive motor will rotate the rotating shaft, causing this portion of the raw material to be screened again. The larger particles after the second screening will be discharged through the material outlet.

[0019] S5: After multiple layers of sieving, the smallest titanium dioxide particles are output through the bottom outlet, completing the sieving process and obtaining coated titanium dioxide of different particle sizes.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. This invention improves upon existing titanium dioxide coated screening machines by incorporating a secondary screening mechanism and a vibrating screen assembly. The secondary screening enhances screening accuracy. While coated vibrating screens improve particle flowability and screening efficiency, some inaccuracies may still occur. Secondary screening further improves screening precision, ensuring product quality stability and consistency. It allows for further grading and optimization of the screened particles, resulting in a more uniform particle distribution and improved product quality and performance. During primary screening, fine particles or impurities may be generated, potentially affecting product quality. Secondary screening removes these particles or impurities, improving product purity and quality. It also allows for more precise control of particle size and distribution, reducing waste and losses during production and improving efficiency and economic benefits.

[0022] 2. This invention extends the coating time and pre-differentiates and screens particles of different sizes by setting screens with different structures on the inner and outer sides. Extending the coating time allows the coating material to more fully cover the particle surface, thereby improving the uniformity of the coating. This helps ensure a consistent coating thickness on the particle surface, thus improving particle stability and flowability. It also reduces particle aggregation: pre-differentiation and screening separates coated particles according to size, reducing size differences and minimizing particle aggregation and accumulation, thereby improving screening efficiency and accuracy. Pre-differentiation and screening of particles of different sizes allows for better control of particle distribution, making it easier for particles to pass through the screen during screening, improving screening effect and accuracy. Pre-differentiation and screening allows for better control of particle size and distribution, which is beneficial for optimizing the coating effect. Particles of different sizes may have different adsorption and coverage effects on the coating material; therefore, pre-differentiation and screening makes the coating effect more uniform and stable. By extending the coating time and pre-differentiating and screening particles of different sizes, the stability, flowability, and dispersibility of the product can be improved, thereby improving product quality and performance. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] The above and other aspects of the invention will now be described by way of example only, with reference to the accompanying drawings, in which:

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is an overall cross-sectional view of the invention;

[0027] Figure 3 This is a schematic diagram of the re-screening mechanism of the present invention;

[0028] Figure 4 This is a schematic diagram of the screening shell structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the internal structure of the screening mechanism of the present invention;

[0030] Figure 6 This is a schematic diagram of the rotating component structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the vibrating screen assembly structure of the present invention;

[0032] Figure 8 This is a cross-sectional view of the vibrating screen assembly of the present invention.

[0033] In the diagram: 1. Fixed base; 2. Supporting spring; 3. Protective outer shell; 4. Re-screening mechanism; 41. Screening outer shell; 411. Material inlet; 412. Material outlet; 42. Limiting chute; 43. Screening plate; 431. Screening through hole; 44. Distributing plate; 441. Distributing trough; 45. Rotating assembly; 451. Rotating shaft; 452. Pushing block; 453. Pushing brush; 454. Limiting block; 5. Drive motor; 6. Vibrating screen; 7. Bottom outlet; 8. Vibrating screen assembly; 81. Outer screen; 82. Guard plate; 83. Discharge hole; 84. Distributing bar; 85. Inner screen. Detailed Implementation

[0034] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0035] like Figure 1-8 As shown, a coated vibrating screen for titanium dioxide includes a fixed base 1, support springs 2, a protective shell 3, a re-screening mechanism 4, a drive motor 5, a vibrating screen 6, a bottom outlet 7, and a vibrating screen assembly 8. The fixed base 1 forms the foundation of the coated vibrating screen for titanium dioxide, providing a stable support structure and ensuring the overall stability of the equipment. The support springs 2 are installed at the four corners of the fixed base 1, providing elastic support for the vibrating screen and reducing the impact of vibration on the external environment. The protective shell 3 is installed on top of the support springs 2 to protect the vibrating screen from external environmental influences and contamination. Furthermore, the protective shell 3 also serves a protective function, preventing accidental contact or contact with the operating vibrating screen. The re-screening mechanism 4 is one of the core components of this vibrating screen. It is installed on the side of the protective shell 3 and is driven by the drive motor 5. The re-screening mechanism 4 is responsible for re-screening the material after the initial screening to improve screening efficiency and accuracy. The drive motor 5 is installed above the re-screening mechanism 4, providing power support for the re-screening process. The drive motor 5 is mounted on top of the re-screening mechanism 4, and the vibrating screen 6 is mounted on both sides of the protective housing 3, achieving particle separation and screening through vibration. The bottom outlet 7 is located below the protective housing 3 to discharge the screened material. The vibrating screen assembly 8 is installed inside the protective housing 3 for preliminary screening of the mixture and downward output of small particles. This design aims to ensure the smooth operation of the screening process and effectively separate particles of different sizes and shapes.

[0036] like Figure 3As shown, the re-screening mechanism 4 includes a screening shell 41, a limiting groove 42, a screening plate 43, a material distribution plate 44, and a rotating assembly 45. The screening shell 41 is installed on the side of the protective shell 3 and is used to perform secondary screening of the material in the protective shell 3 after the initial screening by the vibrating screen assembly 8. The limiting groove 42 is opened on the inner surface of the screening shell 41 and is used to limit the rotation of the rotating assembly 45 and maintain the rotational stability of the rotating assembly 45. The screening plate 43 and the material distribution plate 44 are installed sequentially inside the screening shell 41. The screening plate 43 is used to perform secondary screening of the material entering the screening shell 41. The rotating assembly 45 is installed inside the screening shell 41. The screening shell 41 is designed as a hollow structure, which facilitates the entry and exit of materials. A material inlet 411 is provided on the side of the screening shell 41 near the protective shell 3. The material inlet 411 is used to input the material after primary screening into the re-screening mechanism 4. A material outlet 412 is provided on the side of the screening shell 41. A collection device is provided outside the material outlet 412 to collect and store materials of different particle sizes.

[0037] like Figure 5 As shown, the sieve plate 43 has uniformly distributed sieve through holes 431 on its upper surface. The diameter of the sieve through holes 431 is the same as the diameter of the inner sieve mesh 85 of this layer, thereby achieving the same sieve effect. The material distribution plate 44 has a material distribution slot 441 in the direction near the protective shell 3. The material distribution slot 441 is designed as a fan-shaped ring. The material distribution plate 44 has a material distribution slot 441 in the direction near the protective shell 3, and the slot is designed as a fan-shaped ring. This design can more effectively guide the particles to the sieve area, thereby ensuring that the falling material will not be directly output from the material outlet 412, further ensuring the sieve accuracy. The fan-shaped ring design of the material distribution slot 441 allows the material to flow evenly to the vibrating sieve area, avoiding particle accumulation and blockage, and ensuring the sieve effect.

[0038] like Figure 6 As shown, the rotating assembly 45 includes a rotating shaft 451, a pushing block 452, a pushing brush 453, and a limiting block 454. The upper end of the rotating shaft 451 is connected to the drive motor 5. The pushing blocks 452 are arranged in a circumferential array on the side of the rotating shaft 451. The pushing blocks 452 are used to assist in pushing the material to perform a fine secondary screening process on the material after the initial screening. The pushing brush 453 is installed below the pushing blocks 452. The pushing brush 453 is used to reduce the problem of coating damage caused by titanium dioxide particles during the screening process. The limiting block 454 is installed on the side of the pushing blocks 452.

[0039] like Figure 6As shown, the horizontal cross-sectional shape of the pusher block 452 is fan-shaped, and the diameter of the pusher block 452 gradually increases outward along the rotation axis 451. This design allows the particles to be pushed more evenly during the pushing process, avoiding uneven force on the particles during rotation and ensuring uniform distribution of particles in the screening area. The vertical cross-sectional shape of the limiting block 454 is an isosceles trapezoid. This design helps to limit the movement range of the pusher block 452, ensuring the stability and accuracy of the pusher block 452 during rotation. The reasonable design of the limiting block 454 can effectively control the movement trajectory of the pusher block 452, avoiding poor screening results caused by excessive oscillation or misalignment.

[0040] like Figure 7-8 As shown, the vibrating screen assembly 8 includes an outer screen 81, a baffle plate 82, a discharge hole 83, a distributor bar 84, and an inner screen 85. The outer screen 81 is installed inside the protective housing 3. The baffle plate 82 is installed at the inner edge of the outer screen 81. The discharge hole is located on the side of the baffle plate 82. The distributor bar 84 is installed inside the baffle plate 82, and the inner screen 85 is installed below the distributor bar 84. The distributor bar is cross-shaped, and the inner screen 85 is a downwardly concave arc shape. The vertical cross-section of the baffle plate 82 is a right-angled trapezoid, with its inclined surface close to the distributor bar 84. This allows for thorough mixing of the titanium dioxide particles and coating material during the initial screening process, ensuring sufficient mixing time. Thorough mixing ensures sufficient contact and mixing between the titanium dioxide particles and the coating material, allowing the coating material to uniformly cover the particle surface, thereby improving the uniformity and consistency of the coating. Thorough mixing allows the coating material to adhere evenly to the surface of the titanium dioxide particles, forming a uniform and complete coating layer. This coating effectively protects titanium dioxide particles, improving their stability and durability. Thorough mixing allows for the formation of a good interface between the titanium dioxide particles and the coating material, reducing inter-particle friction and improving particle flowability and dispersibility. This contributes to improved efficiency and quality in subsequent processing. Sufficient mixing ensures optimal matching of the physical and chemical properties between the coating material and the titanium dioxide particles. This optimizes product performance, enhancing product quality and competitiveness.

[0041] A method for coating and sieving titanium dioxide, wherein the method is used in the aforementioned coated vibrating screen for titanium dioxide; the steps of the method for coating and sieving titanium dioxide are as follows:

[0042] S1: Select appropriate outer screen 81 and inner screen 85 according to actual needs, install the selected outer screen 81 and inner screen 85 onto the vibrating screen assembly 8, and ensure that the outer screen 81 and inner screen 85 are clean and intact, without damage or blockage.

[0043] S2: Place the prepared titanium dioxide and coating material into the hopper above the protective shell 3 to complete the feeding work, close the hopper switch, start the vibrating screen 6, and adjust the amplitude and frequency to ensure appropriate screening and coating effects.

[0044] S3: Vibration will cause particles to separate on the outer screen 81 and the inner screen 85, passing through different outer screens 81 and inner screens 85 according to their size;

[0045] S4: A portion of the raw material will enter the re-screening mechanism 4, and the drive motor 5 will drive the rotating shaft 451 to rotate, so that this portion of the raw material will be screened again. The larger particles after the second screening will be discharged through the material outlet 412.

[0046] S5: After multiple layers of sieving, the smallest titanium dioxide particles are output through the bottom outlet 7, completing the sieving process and obtaining coated titanium dioxide of different particle sizes.

[0047] In the operation of this invention, appropriate outer screen 81 and inner screen 85 are selected according to actual needs. The selected outer screen 81 and inner screen 85 are installed on the vibrating screen assembly 8, ensuring that the outer screen 81 and inner screen 85 are clean and intact, without damage or blockage. The prepared titanium dioxide and coating material are simultaneously placed into the hopper above the protective shell 3 to complete the feeding work. The hopper switch is closed, the vibrating screen 6 is started, and the amplitude and frequency are adjusted to ensure appropriate screening and coating effects. Vibration will cause particles to separate on the outer screen 81 and inner screen 85, and they will pass through different outer screens 81 and inner screens 85 according to their size.

[0048] Titanium dioxide and coating material are thoroughly mixed in the concave inner screen 85 to achieve coating. The baffle plate 82 ensures that the mixed particles do not easily overflow from the outer screen 81. The distributor bar 84 is used to improve the efficiency of the vibrating screen. Part of the mixture falls directly onto the lower distributor bar 84 through the inner screen 85, while the other part of the mixture is screened on the outer screen 81 through the discharge hole 83.

[0049] Larger particles of raw material will be mixed with some smaller particles and enter the re-screening mechanism 4. The drive motor 5 will rotate the rotating shaft 451, causing this part of the raw material to be screened again.

[0050] The drive motor 5 drives the rotating shaft 451 to rotate, and the pusher brush 453 drives the mixed particles to be screened again on the screening plate 43. Larger particles are discharged through the material outlet 412, and smaller particles enter the distribution plate 44. During the vibrating screen process, they enter the inlet of the next layer of screening shell 41 through the distribution trough 441, thus ensuring that they are screened again, thereby ensuring that all particles have undergone at least two screening processes.

[0051] Larger particles after secondary screening are discharged through material outlet 412; after multiple layers of screening, the smallest titanium dioxide particles are output through bottom outlet 7, completing the screening process and obtaining coated titanium dioxide of different particle sizes.

[0052] The technical features disclosed above are not limited to combinations of the disclosed features with other features. Those skilled in the art can also make other combinations of the technical features according to the purpose of this disclosure to achieve the intended purpose. The description herein is provided to enable those skilled in the art to implement or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein. Although one or more exemplary embodiments of this disclosure have been described with reference to the accompanying drawings, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of this disclosure as defined by the appended claims. While this disclosure has been described in detail above with general description and specific embodiments, modifications or improvements can be made to the embodiments of this disclosure, which will be apparent to those skilled in the art. Therefore, such modifications or improvements made without departing from the spirit of this disclosure are within the scope of protection claimed herein. The foregoing description is merely illustrative of this disclosure, and modifications may be made to the invention in light of the above detailed description. The terminology used in the appended claims should not be construed as limiting the invention to the specific embodiments disclosed in the specification. Rather, the scope of the invention will be fully defined by the appended claims, which will be interpreted according to established principles of claim interpretation.

Claims

1. A coated vibrating screen for titanium dioxide, characterized in that, The device includes a fixed base (1), a support spring (2), a protective shell (3), a re-screening mechanism (4), a drive motor (5), a vibrating screen (6), a bottom outlet (7), and a vibrating screen assembly (8). The support spring (2) is installed at the four corners of the fixed base (1), the protective shell (3) is installed on top of the support spring (2), the vibrating screen (6) is installed on both sides of the protective shell (3), the bottom outlet (7) is located below the protective shell (3), the vibrating screen assembly (8) is installed inside the protective shell (3), the vibrating screen assembly (8) is used to perform preliminary screening of the mixture and output small particles downwards, the re-screening mechanism (4) is installed on the outer side of the protective shell (3), the drive motor (5) is installed on top of the re-screening mechanism (4), the re-screening mechanism (4) is used to perform re-screening of the material on the screen after the initial screening by the vibrating screen assembly (8) on the same layer, driven by the drive motor (5). The vibrating screen assembly (8) includes an outer screen (81), a guard plate (82), a discharge hole (83), and an inner screen (85). The conical outer screen (81) is installed inside the protective shell (3), the annular guard plate (82) is installed at the upper inner edge of the outer screen (81), the discharge hole (83) is opened on the side of the guard plate (82), and the inner screen (85) is installed below the guard plate (82). The re-screening mechanism (4) includes a screening shell (41), a screening plate (43), a material distribution plate (44), and a rotating assembly (45). The screening shell (41) is installed on the side of the protective shell (3). The screening plate (43) and the material distribution plate (44) are installed sequentially inside the screening shell (41). The rotating assembly (45) is installed inside the screening shell (41). The hollow screening shell (41) has a material inlet (411) on the side near the protective shell (3) and a material outlet (412) on the side of the screening shell (41). The screening plate (43) has uniform openings on its top surface. There is a screening through hole (431), the diameter of which is the same as that of the inner screen (85) in the same layer. The material distribution plate (44) has a material distribution slot (441) in the direction close to the protective shell (3). The screening shell (41) of the next layer has an inlet that communicates with the material distribution slot (441) of the upper layer. The rotating assembly (45) includes a rotating shaft (451) and a pusher block (452). The upper end of the rotating shaft (451) is connected to the drive motor (5). The pusher block (452) is arranged in a circumferential array on the side of the rotating shaft (451) and above the screening plate (43).

2. The coated vibrating screen for titanium dioxide according to claim 1, characterized in that: The re-screening mechanism (4) also includes a limiting groove (42), which is opened on the inner surface of the screening shell (41); the rotating assembly (45) also includes a limiting block (454), which is installed on the side of the pusher block (452) and is adapted to the limiting groove (42).

3. The coated vibrating screen for titanium dioxide according to claim 1, characterized in that: The material distribution trough (441) is designed as a fan-shaped ring.

4. A coated vibrating screen for titanium dioxide according to claim 2, characterized in that: The rotating assembly (45) also includes a pusher brush (453) which is mounted below the pusher block (452).

5. A coated vibrating screen for titanium dioxide according to claim 4, characterized in that: The horizontal cross-sectional shape of the pusher block (452) is set to a fan shape, and the diameter of the pusher block (452) gradually increases outward along the rotation axis (451). The vertical cross-sectional shape of the limiting block (454) is set to an isosceles trapezoid.

6. A coated vibrating screen for titanium dioxide according to claim 1, characterized in that: The vibrating screen assembly (8) also includes a material distribution bar (84), which is installed inside the guardrail (82), and the inner screen (85) is installed below the material distribution bar (84).

7. A coated vibrating screen for titanium dioxide according to claim 6, characterized in that: The vertical cross-sectional shape of the guardrail (82) is set as a right trapezoid, and its inclined surface is set close to the material distribution bar (84).

8. A coated vibrating screen for titanium dioxide according to claim 6, characterized in that: The material distribution bar (84) is set in a cross shape, and the inner screen (85) is set in a downward concave arc shape.

9. A coated sieving method for processing titanium dioxide using a coated vibrating screen according to any one of claims 1-8, characterized in that, The steps of the coating sieving method are as follows: S1: Select appropriate outer screen (81) and inner screen (85) according to actual needs, install the selected outer screen (81) and inner screen (85) onto the vibrating screen assembly (8), and ensure that the outer screen (81) and inner screen (85) are clean and intact, without damage or blockage. S2: Place the prepared titanium dioxide and coating material into the hopper above the protective shell (3) to complete the feeding work, turn off the hopper switch, start the vibrating screen (6), and adjust the amplitude and frequency to ensure appropriate screening and coating effects; S3: Vibration will cause titanium dioxide and coating material to mix in the guardrail (82) and the inner screen (85) to achieve coating. Part of the mixture falls directly onto the lower vibrating screen assembly through the inner screen (85), and the other part of the mixture is screened on the outer screen (81) through the discharge hole (83). S4: A portion of the material on the screen will enter the re-screening mechanism (4), and the drive motor (5) will drive the rotating shaft (451) to rotate, so that this part of the material will be screened again. Larger particles will be discharged through the material outlet (412), and smaller particles will fall onto the distribution plate (44) and enter the inlet of the next layer of the screening shell (41) through the distribution trough (441), thus ensuring that they are screened again. S5: After multiple layers of sieving, the smallest titanium dioxide particles are output through the bottom outlet (7) to complete the sieving process and obtain coated titanium dioxide of different particle sizes.

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