A screening device and screening system

Abstract

This application discloses a screening device and system, belonging to the technical field of screening equipment. It can meet the needs of individual screening in layered screening boxes, and also meet the needs of combined use of multiple screening boxes with different particle sizes. The screening device includes: a feed hopper, a screening body, and a discharge pipe. The screening body is located at the bottom of the feed hopper, and its receiving cavity is connected to the inside of the feed hopper. The screening body has at least two layers of screening boxes, with adjacent screening boxes internally connected. The particle size of the screening boxes gradually decreases along a first direction, which is parallel to the height direction of the screening body and extends from the feed hopper away from it. The screening boxes can screen particles falling into them to adjacent screening boxes with decreasing particle sizes. Adjacent screening boxes are detachably connected. The discharge pipe is located on the side of the screening boxes and can discharge the screened particles from the screening boxes.

Description

Technical Field

[0001] This application belongs to the field of screening equipment technology, and particularly relates to a screening device and screening system. Background Technology

[0002] Screening devices are widely used in mining, agriculture, chemical, and food processing industries to classify, remove impurities from, or separate solids and liquids based on particle size. Their efficiency, precision, and durability directly impact production quality and cost. Traditional layered screening devices cannot meet the needs of individual screening by layered screens or screening combinations of different screen types. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a screening device and screening system that can meet the needs of individual screening in layered screening boxes, while also meeting the needs of combining multiple screening boxes with different screening particle sizes.

[0004] A first aspect of this application provides a screening device, comprising: a feed hopper;

[0005] A screening body is disposed at the bottom of the feed hopper. The screening body has a receiving cavity that communicates with the interior of the feed hopper. The screening body has at least two screening boxes. The interiors of two adjacent screening boxes are connected. The screening particle size of the screening boxes gradually decreases along a first direction. The first direction is parallel to the height direction of the screening body and is a direction away from the feed hopper. The screening boxes can screen the particles falling into the screening boxes to adjacent screening boxes with a smaller screening particle size. The two adjacent screening boxes are detachably connected.

[0006] A screening discharge pipe is located on the side of the screening box, which can discharge the screened particles from the screening box.

[0007] In some embodiments, the screening device further includes several electromagnetic vibrating feeders located at the bottom of the screen discharge pipe, and the particles discharged from the screen discharge pipe can fall into the electromagnetic vibrating feeders.

[0008] In some embodiments, the discharge port of the screen discharge pipe can be adjusted to allow the electromagnetic vibrating feeder into which particles discharged from the screen discharge pipe fall.

[0009] In some embodiments, the screening body has at least three screening boxes.

[0010] In some embodiments, the screening device further includes a plurality of discharge metering sensors that can detect the weight of particles falling into the electromagnetic vibrating feeder.

[0011] In some embodiments, the screening device further includes a base and a rotary vibration drive mechanism. The screening body and the rotary vibration drive mechanism are disposed on the base. The rotary vibration drive mechanism can drive the screening body to vibrate so as to screen the particles in the screening box to an adjacent screening box with a smaller screening particle size.

[0012] In some embodiments, the rotary vibration drive mechanism includes dual vibration motors, which can drive the screening body to undergo three-dimensional composite vibration.

[0013] In some embodiments, the bottom of the screening box is provided with a screen, and the screen is detachably connected to the screening box.

[0014] In some embodiments, at least two screens are provided at the bottom of the screening box.

[0015] A second aspect of this application provides a screening system, comprising: a controller and the screening device described in the first aspect, wherein the controller can receive the weight of particulate matter from the discharge metering sensor and control the electromagnetic vibrating feeder to operate or stop operating based on the weight of the particulate matter.

[0016] The screening device of this application includes a feed hopper, a screening body disposed at the bottom of the feed hopper, a receiving cavity communicating with the interior of the feed hopper, and at least two screening boxes. Adjacent screening boxes are internally connected, and the particle size of the screening boxes gradually decreases along a first direction parallel to the height direction of the screening body and away from the feed hopper. Each screening box can screen particles falling into it to an adjacent screening box with a decreasing particle size. The adjacent screening boxes are detachably connected. A discharge pipe is disposed on the side of each screening box, discharging the screened particles from the screening box. Because the adjacent screening boxes are detachably connected, other screening boxes can be disassembled when individual screening is required in a particular screening box. Therefore, the screening device of this application can meet the requirement of individual screening by a layered screen body. Furthermore, multiple screening boxes can be combined in different ways to meet the requirement of using multiple screening boxes with different particle sizes in combination. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic front view of a screening device provided in an embodiment of this application;

[0019] Figure 2This is a schematic front view of another screening device provided in the embodiments of this application;

[0020] Figure 3 This is a schematic flowchart of a screening method provided in an embodiment of this application. Detailed Implementation

[0021] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0022] Unless otherwise specified, the length direction in this application refers to the longitudinal direction of the screening device, i.e., the X direction; the width direction refers to the transverse direction of the screening device, i.e., the Y direction; and the height direction refers to the vertical direction of the screening device, i.e., the Z direction.

[0023] Traditional layered screening devices cannot meet the needs of individual screening of the layered screen body.

[0024] In view of this, the present application provides a screening device and screening system that can meet the needs of individual screening of layered screening boxes, and at the same time meet the needs of combined use of multiple screening boxes with different screening particle sizes.

[0025] In a first aspect, embodiments of this application provide a screening device. Figure 1 This is a schematic front view of a screening device provided in an embodiment of this application. The screening device includes a feed hopper 10 and a screening body 20, with the screening body 20 located at the bottom of the feed hopper 10, that is, the feed hopper 10 is located at the top of the screening body 20.

[0026] The screening body 20 has a receiving cavity, which is connected to the interior of the feed hopper 10. In this way, the particles entering the feed hopper 10 can fall from the feed hopper 10 into the receiving cavity of the screening body 20 under the action of gravity.

[0027] The screening body 20 has at least two screening boxes 201, and the internal cavities of two adjacent screening boxes 201 are interconnected. Thus, under the influence of gravity, particles in the internal cavities of the screening boxes 201 can fall into the adjacent screening boxes 201. Furthermore, the particle size of the screening boxes gradually decreases along a first direction. This first direction is parallel to the height direction of the screening body and is the direction away from the feed hopper.

[0028] like Figure 1 As shown, the first direction is the direction of gravity, that is... Figure 1The direction is Z. Along the Z direction, the particle size of the screening box 201 gradually decreases. In this way, the particles inside the screening box 201 can fall into the adjacent screening box 201 with a smaller particle size under the action of gravity.

[0029] For example, such as Figure 1 As shown, the screening body 20 includes five screening boxes 201, labeled A1, A2, A3, A4, and A5 respectively. A1, A2, A3, A4, and A5 are distributed along the Z direction, and the screening particle size of A1, A2, A3, A4, and A5 gradually decreases along the Z direction. That is, the size relationship of the screening particle size is A1 > A2 > A3 > A4 > A5.

[0030] When screening particulate matter, particles larger than the screening size A1 remain in A1, and particles smaller than A1 fall into A2. Particles larger than A2 remain in A2, and particles smaller than A2 fall into A3. Particles larger than A3 remain in A3, and particles smaller than A3 fall into A4. Particles larger than A4 remain in A4, and particles smaller than A4 fall into A5. Particles larger than A5 remain in A5, and particles smaller than A5 fall into the bottom collection area.

[0031] It should be noted that the particle size in this embodiment can be the maximum diameter of the particles, and the bottom of the screening box 201 can be arranged with screening holes. The screening particle size of the screening box 201 can be the diameter of the screening holes. Therefore, particle size smaller than screening particle size means that the maximum diameter of the particles is smaller than the diameter of the screening holes. Particle size larger than screening particle size means that the maximum diameter of the particles is larger than the diameter of the screening holes.

[0032] In some embodiments, the screening device may further include a base 30 and a rotary vibration drive mechanism 40. The screening body 20 is disposed on the base 30, and the rotary vibration drive mechanism 40 is disposed on the base. The rotary vibration drive mechanism 40 drives the screening body 20 to vibrate by vibration, so as to screen the particles in the screening box 201 to an adjacent screening box 201 with a smaller screening particle size.

[0033] In this embodiment, two adjacent screening boxes 201 are detachably connected. This allows a screening box 201 to be disassembled when it is no longer needed, or a single screening box 201 can be used independently.

[0034] In some embodiments, the screening body 20 has at least three screening boxes 201.

[0035] For example, such as Figure 1 The screening device shown includes five screening boxes 201, labeled A1, A2, A3, A4, and A5. A1, A2, A3, A4, and A5 are distributed along the Z-direction, and the particle size of A1, A2, A3, A4, and A5 gradually decreases along the Z-direction. If screening box A1 is not needed, it can be removed from the entire screening device, and only screening boxes A2, A3, A4, and A5 are used during screening. If screening box A2 is not needed, screening box A1 can be removed from the screening device first, then screening box A2 can be removed from the screening device, and finally screening box A1 can be installed on the screening device, using only A1, A3, A4, and A5 during screening.

[0036] If only one screening box 201 is needed, only one screening box 201 can be installed on the screening device. For example, if only screening box A3 is needed, all screening boxes 201 can be removed from the screening device, and then only screening box A3 can be installed on the screening device. This can meet the requirement of individual screening by the layered screen body.

[0037] It should be noted that the feed hopper 10 can be suspended above the screening body 20, or the feed hopper can be detachably connected to the screening body 20. The screening boxes 201 can be connected by snap-fit. This application embodiment does not limit the detachable connection method between the screening boxes 201, nor does it limit the detachable connection method between the feed hopper 10 and the screening body 20.

[0038] In this embodiment, the screening boxes 201 can be used in combination according to the actual usage of the particulate matter to meet the needs of screening combinations with multiple different particle sizes. When selecting different screening boxes 201 for combination, the particle size can be randomly measured first. If the particulate matter is obviously a mixture of larger and smaller particles, the screening boxes 201 with the largest and smallest particle sizes can be selected for combination.

[0039] For example, the sieving particle size (sieve aperture) range of screening boxes A1, A2, A3, A4, and A5 is 0.15-4.75 mm. The maximum sieving particle size for A1 can be 4.75 mm, for A2 it can be 3 mm, for A3 it can be 2 mm, for A4 it can be 0.6 mm, and for A5 it can be 0.15 mm. Random measurements of the particles are performed beforehand; the maximum particle size is 5 mm, the minimum is 0.1 mm, and there are very few particles of intermediate sizes.

[0040] Therefore, the particulate matter is clearly a mixture of larger and smaller particles. Thus, screening boxes A1 and A5 can be used in combination. Larger particles (pore size greater than 4.75 mm) remain directly on screening box A1, while smaller particles (pore size less than 0.15 mm) fall onto screening box A5 and then into the final collection box. Screening box A5 can further screen particles with pore sizes greater than 0.15 mm. Using two screening boxes 201 in this way can achieve a better screening effect, thereby improving the particulate matter screening efficiency.

[0041] The screening device also includes a screen discharge pipe 202, which is located on the side of the screening box 201. The screen discharge pipe 202 can discharge the screened particles from the screening box 201. In this embodiment, each screening box 201 may be provided with a screen discharge pipe 202 on its side. In this way, the particles remaining in the screening box 201 can be discharged from the screening box 201 by the screen discharge pipe 202. It should be noted that the screen discharge pipe 202 can be provided on the side of the screening box 201 located at the bottom, or it can be provided at the bottom of the screening box 201 located at the bottom, thereby increasing the particle discharge speed.

[0042] In some embodiments, the screening device further includes several electromagnetic vibrating feeders 50, which are located at the bottom of the screen discharge pipe 202. Particles discharged from the screen discharge pipe 202 can fall into the electromagnetic vibrating feeders 50. Each electromagnetic vibrating feeder 50 includes a collection tray. The feeders vibrate continuously, and the particles discharged from the screen discharge pipe 202 fall into the collection tray, achieving automatic feeding or automatic discharge of particles under the action of vibration.

[0043] In some embodiments, the discharge port of the screen discharge pipe 202 is adjustable to allow the electromagnetic vibrating feeder 50 into which the particles discharged from the screen discharge pipe 202 fall. The screen discharge pipe 202 can be a flexible hose, allowing the discharge port of the screen discharge pipe 202 to be directly moved from the current electromagnetic vibrating feeder 50 to the target electromagnetic vibrating feeder 50. This enables the combined mixing of particles of different sizes.

[0044] The screening box 201 can be a rotatable cylindrical box, so the discharge port of the screen discharge pipe 202 can be moved from the current electromagnetic vibrating feeder 50 to the target electromagnetic vibrating feeder 50 by rotation.

[0045] For example, the sieving particle size (sieving aperture diameter) range of sieving boxes A1, A2, A3, A4, and A5 is 0.15-4.75 mm. The sieving particle size of A1 is the largest, which can be 4.75 mm; the sieving particle size of A2 can be 3 mm; the sieving particle size of A3 can be 2 mm; the sieving particle size of A4 can be 0.6 mm; and the sieving particle size of A5 can be 0.15 mm.

[0046] Therefore, the particle size discharged from the discharge port of the screen discharge pipe 202 connected to the screening box A1 is greater than 4.75, the particle size discharged from the discharge port of the screen discharge pipe 202 connected to the screening box A2 is greater than 3, the particle size discharged from the discharge port of the screen discharge pipe 202 connected to the screening box A3 is greater than 2, the particle size discharged from the discharge port of the screen discharge pipe 202 connected to the screening box A4 is greater than 0.6, and the particle size discharged from the discharge port of the screen discharge pipe 202 connected to the screening box A5 is greater than 0.15.

[0047] like Figure 1 As shown, the discharge port of the screen discharge pipe 202 connected to the screening box A1 corresponds to the electromagnetic vibrating feeder 50 numbered B2. The discharge port of the screen discharge pipe 202 connected to the screening boxes A2 and A3 corresponds to the electromagnetic vibrating feeder 50 numbered B3. The discharge port of the screen discharge pipe 202 connected to the screening box A4 corresponds to the electromagnetic vibrating feeder 50 numbered B4.

[0048] If it is necessary to mix particles with a particle size greater than 4.75 and particles with a particle size greater than 0.15 and less than 0.6, the discharge port of the screen discharge pipe 202 connected to the screening box A1 can be moved to the electromagnetic vibrating feeder 50, numbered B4. The result is as follows: Figure 2 The sieving effect diagram is shown.

[0049] like Figure 2 As shown, the discharge port of the screen discharge pipe 202 connected to the screening box A1 and the discharge port of the screen discharge pipe 202 connected to the screening box A4 both correspond to the electromagnetic vibrating feeder 50 numbered B4, thereby achieving the effect of mixing particles with a particle size greater than 4.75 and particles with a particle size greater than 0.15 and a particle size less than 0.6 together.

[0050] In some embodiments, the rotary vibration drive mechanism 40 may include dual vibration motors, which can drive the screening body to undergo three-dimensional composite vibration.

[0051] Specifically, it can be a rotary vibrating screen. The rotary vibrating screen uses a vertical motor as the excitation source, and eccentric weights are installed at the upper and lower ends of the motor. The motor drives the eccentric weights to rotate, converting the rotational motion of the motor into a three-dimensional motion of horizontal, vertical and inclined motion, and then transmitting this motion to the screen surface, so that the material makes an outward involute motion on the screen surface, realizing the outward rotation of the material.

[0052] After the vibrating screen starts, the eccentric blocks at both ends of its power unit (i.e., the vibrating motor) with different phases generate a compound inertial force due to high-speed rotation. This inertial force forces the vibrating body of the screen to perform a compound rotational motion. Under the action of the vibration force, the screen frame continuously reciprocates, thereby causing the screen surface to vibrate periodically. This causes the material on the screen surface to move in a directional, leaping motion along with the screen box. During this process, material smaller than the screen aperture falls through the screen holes to the lower layer, becoming undersize material, while material larger than the screen aperture is discharged from the discharge port after continuous jumping motion, ultimately completing the screening process. The vibrating body of the vibrating screen exhibits a complex three-dimensional spatial motion trajectory: its horizontal projection is a circle, and its two vertical projections are identical ellipses. In practical applications, by adjusting the phase difference between the eccentric blocks at both ends of the vibrating motor, the motion trajectory of the material on the screen surface can be precisely controlled, thereby achieving a fast and thorough screening effect.

[0053] In some embodiments, the bottom of the screening box 201 is provided with a screen, and the screen is detachably connected to the box body. This allows the screen at the bottom of the screening box 201 to be replaced, thereby changing the screening particle size of the screening box 201, and thus enabling the combined use of screening boxes 201 with more different screening particle sizes.

[0054] In some embodiments, the bottom of the screening box 201 is provided with at least two screens. Multiple screens of different particle sizes can be installed inside the screening box 201, thereby achieving multi-stage screening of particulate matter within only one screening box 201.

[0055] In some embodiments, the screening device further includes several discharge metering sensors 501, which can detect the weight of particles falling into the electromagnetic vibrating feeder 50. The detected particle weight information is then sent to a controller. Upon receiving the position information, the controller analyzes the data to determine the current weight of particles carried by the electromagnetic vibrating feeder 50, and sends a control signal to the drive motor of the electromagnetic vibrating feeder 50, causing the drive motor to start or stop operating.

[0056] In this embodiment, the discharge metering sensor 501 can be a weight sensor, pressure sensor, or other device. This application does not limit the type of device used.

[0057] In this embodiment of the application, the controller may be a PLC (Programmable Logic Controller), a microcontroller, a combinational logic controller, etc.

[0058] A second aspect of this application provides a screening system, which includes a controller and a screening device as described in the first aspect. The controller can receive particulate weight information from the discharge metering sensor 501 and control the electromagnetic vibrating feeder to operate or stop operating based on the particulate weight.

[0059] The weighing method used in this embodiment, compared with the electronic weighing method of related technologies, uses the discharge metering sensor 501 to use on-site weight information, which solves the problems of high environmental requirements, large size, difficult assembly, and unstable zero point of related technologies using electronic weighers, and achieves the effects of accurate data and real-time acquisition.

[0060] The screening system described in this application can be applied to automatic screening projects for construction sand. After being put into use, this system replaces the traditional manual inspection method, significantly reducing labor intensity, improving the level of automation, and reducing the number of operators by 5. The inspection time is shortened from 50 minutes to 5 minutes, increasing inspection efficiency tenfold. The system operates stably and reliably, providing data support for rapid inspection of construction sand in factories and mines to guide the adjustment of production process parameters, and has good demonstration significance and promotional value.

[0061] The third aspect of this application provides a screening method applied to the screening system of the second aspect. Figure 3 This is a schematic flowchart illustrating a screening method provided in an embodiment of this application. This embodiment of the application, through the development of operating software, allows a computer control terminal to remotely control the on-site screening system to implement three operating modes: "timed autonomous operation," "one-click automatic start / stop," and "individual operation of each part," meeting the application needs of different inspection requirements.

[0062] Furthermore, it enables automatic data acquisition and calculation. Data on the total weight entering the sieve and the weight exiting the sieve of the graded material are collected in real-time via sensors, a weighing display transmitter, a PLC, and a control terminal, allowing data to be remotely transmitted from the screening site to the computer control terminal. The PLC calculates the percentage of material remaining on the sieve, and the results are displayed on the laboratory control terminal and saved to a database for easy verification and retrieval.

[0063] This application embodiment also enables automatic uploading of screening data. By developing data transmission software and connecting to the MES (Manufacturing Execution System) system interface, a data transmission channel is established between the field, data terminal, and MES system, enabling data to be uploaded to the MES system.

[0064] like Figure 3 As shown, the screening method includes the following steps:

[0065] In step S101, the current weight information of the particles carried by the electromagnetic vibrating feeder 50 is received from the discharge metering sensor 501. The particles discharged from the screen discharge pipe 202 fall into the receiving tray of the electromagnetic vibrating feeder 50. The discharge metering sensor 501 continuously detects the weight of the particles carried on the receiving tray of the electromagnetic vibrating feeder 50 and continuously sends the weight information to the controller. The discharge metering sensor 501 can send weight information to the controller at a certain frequency.

[0066] For example, electromagnetic vibratory feeder 50, number B2, sends weight information to the controller at a frequency of 20 times per second.

[0067] Step S102: If the current weight information matches the preset weight information, control the electromagnetic vibrating feeder 50 to stop operating; the preset weight information can be data stored in the control panel corresponding to the controller. If the current weight information matches the preset weight information, it means that the current weight information has reached the preset weight information, and the electromagnetic vibrating feeder 50 can stop operating, that is, stop feeding.

[0068] For example, the preset weight information corresponding to the electromagnetic vibrating feeder 50, numbered B2, is X1, meaning that the required weight of particles remaining at A1 is X1. The controller continuously receives weight information Y1 from the discharge metering sensor 501. If Y1 = X1 (or Y1 < X1, but the difference between X1 and Y1 is within the range of difference), the controller controls the electromagnetic vibrating feeder 50, numbered B2, to stop operating.

[0069] Step S103: If the current weight information does not match the preset weight information, control the electromagnetic vibrating feeder 50 to operate or continue operating.

[0070] For example, if Y1 is less than X1 (or the difference between X1 and Y1 is not within the range of difference), the controller controls the electromagnetic vibrating feeder 50 (number B2) to continue operating so that Y1 = X1 (or Y1 < X1, but the difference between X1 and Y1 is within the range of difference). That is, the controller controls the electromagnetic vibrating feeder 50 (number B2) to continue operating so that the weight of the screened particles reaches the preset weight.

[0071] As can be seen, the screening method of this application embodiment can automatically control the operation of the screening device. A control panel can be set up, in which the maximum weight of particles (preset weight information) that each electromagnetic vibrating feeder 50 can bear is input. The controller controls each electromagnetic vibrating feeder 50 to operate or stop based on the preset weight information corresponding to the input electromagnetic vibrating feeder number. Then, combined with the current weight information detected by the discharge metering sensor 501, the controller controls each electromagnetic vibrating feeder 50 to operate or stop.

[0072] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0073] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0074] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0075] In the description of this application, "multiple" means two or more.

[0076] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0077] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A screening device, characterized in that, include: Feed hopper; A screening body is disposed at the bottom of the feed hopper. The screening body has a receiving cavity that communicates with the interior of the feed hopper. The screening body has at least two screening boxes. The interiors of two adjacent screening boxes are interconnected. The screening particle size of the screening boxes gradually decreases along a first direction. The first direction is parallel to the height direction of the screening body and extends from the feed hopper away from the feed hopper. The screening boxes can screen the particles falling into the screening boxes to adjacent screening boxes with a smaller screening particle size. The two adjacent screening boxes are detachably connected. A screening discharge pipe is located on the side of the screening box, which can discharge the screened particles from the screening box.

2. The screening apparatus of claim 1, wherein, The screening device also includes several electromagnetic vibrating feeders, which are located at the bottom of the screen discharge pipe. Particles discharged from the screen discharge pipe can fall into the electromagnetic vibrating feeders.

3. The screening apparatus of claim 2, wherein, The discharge port of the screen discharge pipe is adjustable to allow for the replacement of the electromagnetic vibrating feeder into which the particles fall.

4. The screening device according to claim 3, characterized in that, The screening body has at least three screening boxes.

5. The screening device according to claim 2, characterized in that, The screening device also includes several discharge metering sensors, which can detect the weight of particles falling into the electromagnetic vibrating feeder.

6. The screening device according to claim 1, characterized in that, The screening device further includes a base and a rotary vibration drive mechanism. The screening body and the rotary vibration drive mechanism are disposed on the base. The rotary vibration drive mechanism can drive the screening body to vibrate so as to screen the particles in the screening box to the adjacent screening box with a smaller screening particle size.

7. The screening device according to claim 6, characterized in that, The rotary vibration drive mechanism includes dual vibration motors, which can drive the screening body to undergo three-dimensional composite vibration.

8. The screening device according to claim 1, characterized in that, The bottom of the screening box is equipped with a screen, and the screen is detachably connected to the screening box.

9. The screening device according to claim 8, characterized in that, The bottom of the screening box is provided with at least two screens.

10. A screening system, characterized in that, include: The controller and the screening device as described in any one of claims 2-5, wherein the controller can receive the weight of the particles from the discharge metering sensor and control the electromagnetic vibrating feeder to operate or stop operating based on the weight of the particles.

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