Material screener

Abstract

This invention discloses a material screening device, which includes a feeding section, a feeding section, a screening disc, a driving section, and a fine material container. The feeding section is opposite to the screening disc, and a material temporary storage space is formed between them. The feeding section is provided with a material passage hole, which connects the feeding section and the material temporary storage space. The driving section is connected to the feeding section and is used to drive the feeding section to rotate. The screening disc covers the opening of the fine material container and is provided with multiple fan-shaped screening sections. Each fan-shaped screening section is provided with multiple arc-shaped grooves. The multiple arc-shaped grooves are concentrically distributed and distributed radially along the screening disc. Fine material screening holes are provided in the arc-shaped grooves, which connect the material temporary storage space and the fine material container. A coarse material discharge channel is formed between two adjacent fan-shaped screening sections. The coarse material discharge channel extends radially along the screening disc and is connected to the arc-shaped groove of the adjacent fan-shaped screening section.

Description

Technical Field

[0001] This invention relates to the field of screening equipment technology, and in particular to a material screening device. Background Technology

[0002] Powder metallurgy technology can significantly reduce alloy component segregation, thereby eliminating coarse and uneven casting structures and improving casting quality. Powder metallurgy technology plays a crucial role in the preparation of high-performance rare-earth permanent magnet materials, and is therefore increasingly favored by rare-earth permanent magnet material manufacturers.

[0003] In powder metallurgy, powder forming and sintering is a crucial technology for preparing high-performance rare-earth permanent magnet materials, and powder manufacturing is a vital step within this process. In most related technologies, the blanks formed using powder forming and sintering require a high degree of uniformity in microcrystalline grain size to ensure consistent performance across all locations after sintering. To achieve this, the particle size of the powder needs to be controlled within a narrow range during the powder manufacturing process.

[0004] Therefore, relevant technologies generally control the particle size of powder through the following two aspects: First, improving the process itself during powder manufacturing to ensure that the particle size of the produced powder follows an ideal normal distribution. Of course, this method can only control the particle size of most of the produced powder to meet the requirements, but some powder particles may still be too large. Second, screening the powder after production to collect powder with the required particle size and using it to prepare high-performance rare-earth permanent magnet materials. This screening method can better control the particle size of the powder.

[0005] However, while related technologies separate powders of different particle sizes using vibrating sieving, significant powder accumulation occurs during the process, making it difficult for powders meeting the required particle size to pass through the sieve openings. Therefore, this method results in a high residual rate of powders meeting the required particle size during separation. To improve the yield of powders meeting the required particle size, prolonged vibration is necessary, and sometimes manual pressure must be applied to the powder in the sieve to encourage more powders meeting the required size to pass through the sieve openings and be collected. This often requires considerable manual labor, ultimately leading to low powder separation efficiency.

[0006] It should be noted that the problem is not limited to powders used to manufacture high-performance rare earth permanent magnet materials, nor is it limited to powders. Other types of materials with larger particle sizes also face the same problem when separating materials of different particle sizes. How to solve the problems of high residual rate of materials with the required particle size (i.e., smaller particle size) and low separation efficiency in the separation of materials of different particle sizes in related technologies is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] This invention discloses a material screening device to solve the problems in related technologies, such as high residual rate of materials with the required particle size and low separation efficiency when screening materials of different particle sizes by vibration.

[0008] To address the aforementioned technical problems, the present invention discloses the following technical solutions:

[0009] A material screening device includes a feeding section, a feeding section, a screening disc, a driving section, and a fine material container, wherein:

[0010] The feeding section is opposite to the screening disc and a material storage space is formed between them. The feeding section is provided with a material passage hole, which connects the feeding section and the material storage space. The driving section is connected to the feeding section and is used to drive the feeding section to rotate.

[0011] The screening disc covers the opening of the fine material container. The screening disc has multiple fan-shaped screening sections, and each fan-shaped screening section has multiple arc-shaped grooves. The multiple arc-shaped grooves are concentrically distributed and distributed radially along the screening disc. Fine material screening holes are provided in the arc-shaped grooves, and the fine material screening holes connect the material temporary storage space and the fine material container.

[0012] A coarse material discharge channel is formed between two adjacent sector screen sections. The coarse material discharge channel extends radially along the screen disc and is connected to the arc-shaped groove in the adjacent sector screen section.

[0013] Optionally, in the above-mentioned material screening device, the coarse material discharge channel is provided with fine material screen holes, and the coarse material discharge channel is provided with a plurality of fine material screen holes, and the fine material screen holes in the coarse material discharge channel are distributed radially along the screening disc.

[0014] Optionally, in the above-mentioned material screening device, the fine material screen holes of the coarse material discharge channel are located in the coarse material discharge channel near the opening of the arc-shaped groove.

[0015] Optionally, in the above-mentioned material screening device, the feeding part includes a receiving pipe, the cavity of the receiving pipe is the material passage hole, the feeding part is rotatably connected to the receiving pipe, and the driving part is connected to the receiving pipe and is used to drive the feeding part to rotate through the receiving pipe.

[0016] Optionally, in the above-mentioned material screening device, the driving unit includes a power source and a transmission mechanism. The transmission mechanism includes a transmission chain or transmission belt, a driving wheel, and a driven wheel with the receiving pipe as the mounting shaft. The transmission chain or transmission belt is respectively connected to the driving wheel and the driven wheel for transmission. The power source is connected to the driving wheel and is used to drive the driving wheel to rotate.

[0017] Optionally, in the above-mentioned material screening device, the material feeding section includes a receiving pipe, a feeding frame, and multiple feeding bodies. The receiving pipe is located on the side of the feeding frame away from the material storage space, and the cavity of the receiving pipe is the material passage hole. The multiple feeding bodies are located on the side of the feeding frame facing the screening disc, and the multiple feeding bodies extend radially along the screening disc. The multiple feeding bodies, the feeding frame, and the screening disc enclose the material storage space.

[0018] Optionally, in the above-mentioned material screener, the material feeding body is a material feeding brush, the first ends of the plurality of material feeding bodies are distributed around the material passage hole, and the second ends of the plurality of material feeding bodies extend to the edge of the screening disc, wherein:

[0019] The contact between the material-dispensing brush and the screening disc is a line contact; and / or...

[0020] The hardness of the bristles at the first end of the material-dispensing brush is less than the hardness of the bristles at the second end of the material-dispensing brush; and / or,

[0021] The density of the bristles at the first end of the material-dispensing brush is less than the density of the bristles at the second end of the material-dispensing brush.

[0022] Optionally, in the above-mentioned material screening device, the material screening device further includes a coarse material container, at least a portion of which is disposed in the coarse material container, and a coarse material drop space is formed between the outer wall surface of the fine material container and the inner wall surface of the coarse material container, and the coarse material drop space is connected to the coarse material discharge channel.

[0023] Optionally, in the above-mentioned material screening device, the fine material container is installed at the opening of the coarse material container, and the material screening device further includes a fine material conveyor, which is connected to the fine material container and is used to convey the fine material in the fine material container away.

[0024] Optionally, the material screening device described above further includes a coarse material conveyor, a grinder, and a return pipe. The coarse material conveyor connects the coarse material container to the inlet of the grinder and is used to convey the coarse material collected in the coarse material container to the grinder. The return pipe connects the outlet of the grinder and the feed section.

[0025] The technical solutions disclosed in the embodiments of the present invention have the following technical effects:

[0026] The material sieve disclosed in this invention provides a sieve mode with a different mechanism. The material entering the temporary storage space rotates under the drive of the feeding section. During rotation, the material gradually moves towards the edge of the screening disc under centrifugal force, thus being well distributed in each sector-shaped screening area. It undergoes thorough centrifugal motion in multiple arc-shaped grooves, separating smaller particles through the fine sieve holes in the arc-shaped grooves, while larger particles pass through the arc-shaped grooves and enter the coarse discharge channel for discharge. Throughout the process, the feeding section not only spreads the material to prevent accumulation but also further spreads it through centrifugal motion, ensuring thorough sieve separation. This effectively avoids the problem of material accumulation and difficulty in separating smaller particles that cannot be alleviated by vibrating screening methods in related technologies. This undoubtedly solves the problem of high residue rates of smaller particles. Furthermore, the entire process does not require manual pressure on the material, allowing for the collection of more qualified material (i.e., material with a preset particle size), which undoubtedly improves the material separation efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the material screening device disclosed in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the screening disc of the material screener disclosed in an embodiment of the present invention, wherein, Figure 2 The black dots in the image indicate fine material sieve aperture 33;

[0029] Figure 3 This is a schematic diagram of the material feeding section of the material screener disclosed in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the transmission mechanism disclosed in an embodiment of the present invention;

[0031] Figure 5 This is another structural schematic diagram of the material screening device disclosed in an embodiment of the present invention;

[0032] Figure 6 This is another structural schematic diagram of the material screening device disclosed in the embodiment of the present invention.

[0033] The components in the diagram are labeled as follows:

[0034] 10-Feeding Section

[0035] 20-Material feeding section, 21-Material passage hole, 22-Material receiving pipe, 23-Material feeding frame, 24-Material feeding body,

[0036] 30-Screening disc, 31-Fan-shaped screening section, 32-Arc-shaped groove, 33-Fine material screen hole, 34-Coarse material discharge channel.

[0037] 40-Drive unit, 41-Power source, 42-Transmission mechanism, 421-Transmission chain or belt, 422-Driving pulley, 423-Driven pulley

[0038] 50 - Fine material container, 51 - Opening, 52 - Fine material conveyor

[0039] 60 - Material Temporary Storage Space

[0040] 70- Coarse material container, 71- Coarse material drop space, 72- Opening, 73- Coarse material conveyor, 74- Grinding mill, 75- Return pipe. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0042] The technical solutions disclosed in the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] This invention discloses a material sieve for separating materials of different particle sizes. The materials involved in this invention can be materials with small particle sizes, such as powder, or particles with larger particle sizes; this invention does not limit the type of material.

[0044] Please refer to Figures 1 to 6 The material screening device disclosed in this embodiment of the invention includes a feeding section 10, a feeding section 20, a screening disc 30, a driving section 40, and a fine material container 50.

[0045] The feed section 10 is the component for material to enter the material screener. The feed section 10 can be designed with a structure that facilitates feeding, for example, the feed section 10 can be a feed hopper, such as... Figure 1The feeding section 10 can also be a box-shaped structure; the specific structure of the feeding section 10 is not limited in this embodiment of the invention.

[0046] The feeding section 20 is at least used to separate and drive the material movement. The screening disc 30 is used to screen the received material. Specifically, the feeding section 20 is opposite to the screening disc 30, and a material storage space 60 is formed between them. The material storage space 60 is used to temporarily store the material before it is separated.

[0047] The feeding section 20 is provided with a material passage hole 21, which connects the feeding section 10 and the material temporary storage space 60. After the material is fed into the feeding section 10, the material will enter the material temporary storage space 60 through the material passage hole 21 from the feeding section 10, thereby realizing the conveying of the material before it is separated.

[0048] The drive unit 40 is connected to the feeding unit 20, and the drive unit 40 is used to drive the feeding unit 20 to rotate. During operation, the drive unit 40 drives the feeding unit 20 to rotate, and the rotation of the feeding unit 20 will push the material that has entered the material storage space 60, thereby pushing the material apart to avoid material accumulation, and at the same time driving the material that has entered the material storage space 60 to roll on the screening disc 30.

[0049] The screening disc 30 at least performs the function of material screening, and covers the opening 51 of the fine material container 50. Optionally, the screening disc 30 can be fixed and cover the opening 51 of the fine material container 50. The screening disc 30 has multiple sector-shaped screening sections 31, each sector-shaped screening section 31 has multiple arc-shaped grooves 32, and the multiple arc-shaped grooves 32 are concentrically distributed and radially distributed along the screening disc 30. Fine material screening holes 33 are provided in the arc-shaped grooves 32, which allow materials with smaller particle sizes to pass through. In this embodiment of the invention, the fine material screening holes 33 connect the material temporary storage space 60 and the fine material container 50. After passing through the fine material screening holes 33, the materials with smaller particle sizes (i.e., the fine materials described below) fall into the fine material container 50 under the action of gravity, thereby realizing the collection of fine materials.

[0050] In this embodiment of the invention, the arc-shaped groove 32 may have one or more fine material screening holes 33. Considering screening efficiency, it is more preferable that each arc-shaped groove 32 may have multiple fine material screening holes 33, and these fine material screening holes 33 may be distributed in the extension direction of the arc-shaped groove 32. Of course, this embodiment of the invention does not limit the specific number of fine material screening holes 33 in the arc-shaped groove 32.

[0051] It should be noted that the embodiments of the present invention do not limit the particle size of materials with smaller particle sizes that can pass through the fine material sieve holes 33. In the specific design process, the designer can reasonably design the diameter of the fine material sieve holes 33 according to the separation requirements, so that the fine material sieve holes 33 can just allow materials with a preset particle size (i.e., materials with smaller particle sizes, which are also referred to as fine materials later) to pass through and be collected. Of course, materials with a particle size larger than the preset particle size (i.e., coarse materials referred to later) are temporarily retained on the screening disc 30. Materials with a preset particle size can pass through the fine material sieve holes 33, while materials with a particle size larger than the preset particle size cannot pass through the fine material sieve holes 33.

[0052] A coarse material discharge channel 34 is formed between two adjacent sector screen sections 31. The coarse material discharge channel 34 extends radially along the screening disc 30 and is connected to the arc-shaped groove 32 in the adjacent sector screen section 31. The material entering the arc-shaped groove 32 rolls under the rotation of the feeding part 20. The material with smaller particle size will fall into the fine material container 50 through the fine material screen hole 33 during the movement in the arc-shaped groove 32. The material with larger particle size can enter the coarse material discharge channel 34 from the arc-shaped groove 32 and be discharged through the coarse material discharge channel 34.

[0053] To better understand the material screening device disclosed in the embodiments of the present invention, the material screening process of the material screening device disclosed in the embodiments of the present invention is further described systematically below:

[0054] Material is fed into the feeding section 10 and enters the material storage space 60 formed between the feeding section 20 and the screening disc 30 through the material passage 21. The driving section 40 drives the feeding section 20 to rotate, so that the feeding section 20 can push the material entering the material storage space 60 to roll in the arc-shaped groove 32 on the screening disc 30 with the center of the screening disc 30 as the center. The feeding section 20 can not only push the material to spread it out as quickly as possible, but also push the material to perform centrifugal motion on the screening disc 30 through its own rotation. During the material movement, the material spread in each sector screening section 31 will enter the multiple arc-shaped grooves 32 in the sector screening section 31. The material with smaller particle size will fall into the fine material container 50 through the fine material screen hole 33 as it moves along the arc-shaped groove 32, thereby achieving separation. Larger particles, unable to pass through the fine material sieve openings 33, continue moving into the coarse material discharge channel 34. Under centrifugal force, they move radially along the screening disc 30 and are eventually discharged from the edge of the screening disc 30. The larger particles discharged from the edge of the screening disc 30 do not enter the fine material container 50, while smaller particles pass through the screening disc 30 and enter the fine material container 50, thus achieving material screening.

[0055] As can be seen from the above screening process, the material screener disclosed in this embodiment of the invention provides a screening mode with a different mechanism. The material entering the material storage space 60 rotates under the drive of the feeding section 20. During rotation, the material gradually moves centrifugally towards the edge of the screening disc 30 under the action of centrifugal force, thus being well distributed in each sector screening section 31. It then undergoes sufficient centrifugal motion in multiple arc-shaped grooves 32, separating smaller particles from the fine material screening holes 33 within the arc-shaped grooves 32. Larger particles, after passing through the arc-shaped grooves 32, enter the coarse material discharge channel 34 and are discharged. Throughout the process, the feeding section 20 not only spreads the material to avoid accumulation but also further spreads it through centrifugal motion, ensuring thorough screening. This effectively avoids the problem in related technologies where vibrating screening methods cannot alleviate material accumulation and make it difficult to separate smaller particles. This undoubtedly solves the problem of high residual rates of smaller particles. Meanwhile, the entire process does not require manual pressure to be applied to the material, which can collect more materials that meet the requirements (i.e., materials with a particle size that meets the preset particle size), which can undoubtedly improve the material separation efficiency.

[0056] It is important to emphasize that during the screening process, even if there is a large amount of material in a certain arc-shaped trough 32, preventing some material from moving fully within that trough, the material in the current arc-shaped trough 32 is easily transferred radially to an adjacent arc-shaped trough 32 under the action of centrifugal force. This material is then received by the other arc-shaped trough 32 and continues to undergo centrifugal motion before being screened there. From this perspective, the concentrically distributed multiple arc-shaped troughs 32 included in each sector-shaped screening section 31 facilitate thorough screening of the material, which can further reduce the problem of high residual rates of smaller particle sizes.

[0057] In the specific screening process, some materials may be directly pushed into the coarse material discharge channel 34 without passing through the fan-shaped screening section 31. Similarly, some smaller particles may pass through the arc-shaped groove 32 within the fan-shaped screening section 31 but fail to pass through the fine material screen holes 33 within the arc-shaped groove 32 before entering the coarse material discharge channel 34. In this case, these smaller particles (i.e., fine materials) are easily discharged as coarse material. To further improve the recovery rate of fine materials, in a further embodiment, the coarse material discharge channel 34 may also be provided with fine material screen holes 33. The fine material screen holes 33 in the coarse material discharge channel 34 can capture the fine materials entering the coarse material discharge channel 34 and allow them to pass through and fall into the fine material container 50. Specifically, the coarse material discharge channel 34 may have one fine material screen hole 33 or multiple fine material screen holes 33; the embodiments of the present invention do not limit the number of fine material screen holes 33 in the coarse material discharge channel 34. To improve the capture capacity of fine materials, a preferred solution is to provide multiple fine material screen holes 33 in the coarse material discharge channel 34. Furthermore, the multiple fine material screen holes 33 in the coarse material discharge channel 34 can be radially distributed along the screening disc 30, so that the fine materials carried by the coarse material can more easily pass through the fine material screen holes 33 during the coarse material discharge process, thereby improving the fine material recovery rate.

[0058] Preferably, the fine material screen holes 33 in the coarse material discharge channel 34 can be located at the opening of the adjacent arc-shaped groove 32 in the coarse material discharge channel 34. This arrangement allows materials with smaller particle sizes that may come out of the arc-shaped groove 32 to pass through the fine material screen holes 33 in a timely manner and be screened out, which helps to improve screening efficiency.

[0059] In this embodiment of the invention, the feeding section 20 includes a receiving pipe 22, the cavity of which is a material passage hole 21. The receiving pipe 22 is rotatably engaged with the feeding section 10. Specifically, the feeding section 10 can be fixedly installed. Optionally, the material screener disclosed in this embodiment of the invention may further include a support, and the feeding section 10 can be fixed to the support to achieve fixed installation. The driving section 40 is connected to the receiving pipe 22 and is used to drive the feeding section 20 to rotate through the receiving pipe 22. In this case, the driving section 40 drives the receiving pipe 22 to rotate, thereby realizing the rotation of the entire feeding section 20. The receiving pipe 22 not only serves to receive material from the feeding section 10, but also cooperates with the driving section 40 and is driven by the driving section 40 to realize the rotation of the entire feeding section 20.

[0060] At the same time, during the process of the drive unit 40 driving the receiving pipe 22 to rotate, the receiving pipe 22 will vibrate to a certain extent due to the transmission, which is beneficial for the material to enter the receiving pipe 22 from the feed unit 10, thereby alleviating the blockage of the material in the receiving pipe 22.

[0061] In other embodiments, the drive unit 40 may be connected to other parts of the feeding unit 20 (such as the feeding frame 23 described later), and is not limited to the receiving tube 22 of the feeding unit 20.

[0062] The drive unit 40 can be of various types, and the embodiments of the present invention do not limit the specific type and structure of the drive unit 40. In a preferred embodiment, the drive unit 40 may include a power source 41 and a transmission mechanism 42. The transmission mechanism 42 may include a transmission chain or transmission belt 421, a driving wheel 422, and a driven wheel 423. The driven wheel 423 can be mounted with the receiving pipe 22 as the mounting shaft, that is, the driven wheel 423 is fixed to the receiving pipe 22. The transmission chain or transmission belt 421 can be driven and cooperated with the driving wheel 422 and the driven wheel 423 respectively. The power source 41 is connected to the driving wheel 422 and is used to drive the driving wheel 422 to rotate. In the specific driving process, the drive unit 40 drives the driving wheel 422 to rotate, the driving wheel 422 drives the driven wheel 423 to rotate through the transmission chain or transmission belt 421, and the driven wheel 423 drives the receiving pipe 22 and even the entire feeding unit 20 to rotate. Of course, the transmission mechanism 42 can also be a gear transmission mechanism, etc., and the embodiments of the present invention do not limit the specific type of the transmission mechanism 42. In this embodiment of the invention, the power source 41 can be a drive motor or a hydraulic motor. This embodiment of the invention does not limit the specific type of the power source 41.

[0063] The transmission chain or belt 421 cooperates with the driven wheel 423 to produce a large contact area, similar to semi-enclosing the receiving tube 22, thereby alleviating the bias force on the receiving tube 22 and ensuring the stability of the rotation of the receiving tube 22.

[0064] In this embodiment of the invention, the structure of the feeding unit 20 can be varied, as long as it can form a certain space (i.e., material temporary storage space 60) with the screening disc 30 and can agitate the material conveyed to the screening disc 30 while rotating. In an optional solution, the feeding unit 20 may include a receiving pipe 22, a feeding frame 23, and multiple feeding bodies 24. The receiving pipe 22 is located on the side of the feeding frame 23 away from the material temporary storage space 60, and the cavity of the receiving pipe 22 is a material passage hole 21. The multiple feeding bodies 24 are located on the side of the feeding frame 23 facing the screening disc 30 and extend radially along the screening disc 30. The multiple feeding bodies 24, the feeding frame 23, and the screening disc 30 form the material temporary storage space 60. In the specific driving process, when the receiving pipe 22 is driven by the driving unit 40, the receiving pipe 22 drives the feeding frame 23 and the multiple feeding bodies 24 to rotate, thereby causing the multiple feeding bodies 24 to agitate the material on the screening disc 30 to undergo centrifugal motion.

[0065] Optionally, the feeding section 20 can be coaxially distributed with the screening disc 30, that is, the central axis of the screening disc 30 coincides with the rotation axis of the feeding section 20, and multiple feeding bodies 24 can be radially distributed with the rotation axis of the feeding section 20 as the center.

[0066] The material feeding body 24 can have various structures. For example, the material feeding body 24 can be a lever or a material feeding brush. The embodiments of the present invention do not limit the specific structure of the material feeding body 24.

[0067] When the feeding body 24 is a feeding brush, the first ends of multiple feeding bodies 24 can be distributed around the material passage 21, and the second ends of multiple feeding bodies 24 extend to the edge of the screening disc 30. In order to reduce rotational resistance without affecting the feeding function, the contact between the feeding brush and the screening disc 30 can be a line contact. Using a line contact method can reduce the contact area, thereby reducing resistance.

[0068] In another embodiment, the hardness of the bristles at the first end of the material-dispensing brush can be less than the hardness of the bristles at the second end of the material-dispensing brush. This structure allows the first end of the material-dispensing brush to be easily deformed, so as not to cause excessive obstruction to the large amount of material that has just entered the material storage space 60, thereby facilitating the dispersion of the material during centrifugal motion.

[0069] In another embodiment, the bristle density at the first end of the material-dispensing brush can be less than the bristle density at the second end of the material-dispensing brush. In this case, because the bristles at the first end of the material-dispensing brush are sparser, they will not cause significant obstruction to the large amount of material that has just entered the material storage space 60, which is also beneficial for the material to disperse during centrifugal motion.

[0070] To facilitate the collection of coarse materials, the material separator disclosed in this embodiment of the invention may further include a coarse material container 70, and at least a portion of a fine material container 50 may be disposed within the coarse material container 70. A coarse material drop space 71 is formed between the outer wall surface of the fine material container 50 and the inner wall surface of the coarse material container 70, and the coarse material drop space 71 is connected to the coarse material discharge channel 34. In the specific working process, the coarse material is discharged from the coarse material discharge channel 34 of the screening disc 30, and then falls into the coarse material drop space 71 under the action of gravity, thereby realizing the collection of coarse materials.

[0071] For ease of assembly, the fine material container 50 can be installed at the opening 72 of the coarse material container 70. Specifically, the fine material container 50 can overlap the edge of the opening 72 of the coarse material container 70. The material screener disclosed in this embodiment of the invention may also include a fine material conveyor 52, which is connected to the fine material container 50 and is used to convey the fine material in the fine material container 50 away, thereby timely discharging the fine material in the fine material container 50. Of course, the fine material container 50 can also be detachably installed at the opening 72 of the coarse material container 70. When the fine material container 50 is full of fine material, the fine material container 50 can be removed as a whole, thereby realizing the subsequent processing of the fine material in the fine material container 50.

[0072] The material screener disclosed in this embodiment of the invention may further include a coarse material conveyor 73, a grinder 74, and a return pipe 75. The coarse material conveyor 73 connects the coarse material container 70 to the inlet of the grinder 74, and is used to convey the coarse material in the coarse material container 70 to the grinder 74 for further grinding. The return pipe 75 connects the outlet of the grinder 74 and the feed section 10. After being ground by the grinder 74, the coarse material enters the feed section 10 through the return pipe 75 for further screening. This material screener structure can reduce the output of coarse material, thereby reducing the residual rate of fine material.

[0073] This invention does not limit the specific type of grinding mill 74; users can adaptively select grinding equipment according to the type of material. The coarse material conveyor 73 can be a screw conveyor or a belt conveyor; this invention does not limit the specific type of coarse material conveyor 73. The return pipe 75 can achieve material return through negative pressure adsorption. Of course, a screw conveyor can also be installed inside the return pipe 75 to transport the ground material; this invention does not limit the specific return method of the return pipe 75.

[0074] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A material screener characterized by, The device comprises a feeding part (10), a stirring part (20), a screening disc (30), a driving part (40) and a fine material container (50), wherein: The stirring part (20) is opposite to the screening disc (30) and a material temporary storage space (60) is formed between the stirring part (20) and the screening disc (30), the stirring part (20) is provided with a material passing hole (21) which is communicated with the feeding part (10) and the material temporary storage space (60), the driving part (40) is connected with the stirring part (20) and is used for driving the stirring part (20) to rotate; The screening disc (30) covers the opening of the fine material container (50), the screening disc (30) is provided with a plurality of fan-shaped screening zones (31), the fan-shaped screening zone (31) is provided with a plurality of arc-shaped grooves (32), the plurality of arc-shaped grooves (32) are concentrically distributed and are distributed along the radial direction of the screening disc (30), the arc-shaped groove (32) is provided with a fine material sieve hole (33) therein, and the fine material sieve hole (33) is communicated with the material temporary storage space (60) and the fine material container (50). Two adjacent fan-shaped screening zones (31) form a coarse material discharging channel (34), the coarse material discharging channel (34) extends along the radial direction of the screening disc (30), the coarse material discharging channel (34) is communicated with the arc-shaped groove (32) in the adjacent fan-shaped screening zone (31), the stirring part (20) comprises a material receiving pipe (22), a stirring frame (23) and a plurality of stirring bodies (24), the material receiving pipe (22) is arranged on the side of the stirring frame (23) which is away from the material temporary storage space (60), the lumen of the material receiving pipe (22) is the material passing hole (21), the plurality of stirring bodies (24) are arranged on the side of the stirring frame (23) which is towards the screening disc (30), the plurality of stirring bodies (24) extend along the radial direction of the screening disc (30), the plurality of stirring bodies (24), the stirring frame (23) and the screening disc (30) enclose the material temporary storage space (60), the stirring body (24) is a stirring brush, the first ends of the plurality of stirring bodies (24) are distributed around the material passing hole (21), and the second ends of the plurality of stirring bodies (24) extend to the edge of the screening disc (30), wherein: The contact between the stirring brush and the screening disc (30) is linear contact; and / or, The hardness of the bristles of the first end of the stirring brush is smaller than the hardness of the bristles of the second end of the stirring brush; and / or, The density of the bristles of the first end of the stirring brush is smaller than the density of the bristles of the second end of the stirring brush.

2. The material screener of claim 1, wherein, The coarse material discharging channel (34) is provided with the fine material sieve hole (33), the coarse material discharging channel (34) is provided with a plurality of fine material sieve holes (33), and the fine material sieve holes (33) in the coarse material discharging channel (34) are distributed along the radial direction of the screening disc (30).

3. The material screener of claim 2, wherein, The fine material sieve hole (33) of the coarse material discharging channel (34) is located at a position adjacent to the groove opening of the arc-shaped groove (32) in the coarse material discharging channel (34).

4. The material screener of claim 1, wherein, The poking part (20) comprises a receiving pipe (22), a pipe cavity of the receiving pipe (22) is the material passing hole (21), the feeding part (10) is rotationally connected with the receiving pipe (22), the driving part (40) is connected with the receiving pipe (22), and is used for driving the poking part (20) to rotate through the receiving pipe (22).

5. The material screener of claim 4, wherein, The driving part (40) comprises a power source (41) and a transmission mechanism (42), the transmission mechanism (42) comprises a transmission chain or belt (421), a driving wheel (422) and a driven wheel (423) with the receiving pipe (22) as an installation shaft, the transmission chain or belt (421) is in transmission cooperation with the driving wheel (422) and the driven wheel (423) respectively, the power source (41) is connected with the driving wheel (422), and is used for driving the driving wheel (422) to rotate.

6. The material screener of claim 1, wherein, The material screening device further comprises a coarse material container (70), at least part of the fine material container (50) is arranged in the coarse material container (70), a coarse material falling space (71) is formed between an outer wall surface of the fine material container (50) and an inner wall surface of the coarse material container (70), and the coarse material falling space (71) is in communication with the coarse material discharging channel (34).

7. The material screener of claim 6, wherein, The fine material container (50) is arranged at an opening of the coarse material container (70), and the material screening device further comprises a fine material conveyor (52), the fine material conveyor (52) is in communication with the fine material container (50), and is used for conveying the fine material in the fine material container (50) away.

8. The material screener of claim 6, wherein, The material screening device further comprises a coarse material conveyor (73), a grinder (74) and a return pipe (75), the coarse material conveyor (73) connects the coarse material container (70) and an inlet of the grinder (74), the coarse material conveyor (73) is used for conveying the coarse material collected in the coarse material container (70) to the grinder (74), and the return pipe (75) is in communication with an outlet of the grinder (74) and the feeding part (10).

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