A screening device

Abstract

The application discloses a screening device and relates to the technical field of magnetic powder core processing devices.The screening device comprises vibration motors arranged at the two sides of the bottom end of a box body, and the box body and a bottom plate are connected through equidistantly distributed first springs; the screening device further comprises a primary screening assembly, a secondary screening assembly and a dust collecting mechanism; the primary screening assembly is installed on the outer wall of the box body and is used for performing primary screening work on magnetic powder alloy; the secondary screening assembly comprises an inclined filter screen arranged on the inner wall of the box body, the top end of the inclined filter screen extends to an opening on the outer wall of the box body at one side, and the secondary screening assembly is used for performing secondary screening work on the magnetic powder alloy; the dust collecting mechanism comprises a material guide pipe located at the top end of the box body, the material guide pipe is fixed on a fan and extends to a static layer at one end of the outer wall, and the dust collecting mechanism is used for recycling dust generated in the material conveying process of the magnetic powder alloy. The screening device solves the technical problems that the currently used screening device is prone to blockage, the screening effect is poor, the product quality is reduced, and the device is not conducive to popularization and use.

Description

Technical Field

[0001] This invention relates to the field of magnetic powder core processing equipment, specifically a screening device. Background Technology

[0002] Magnetic powder cores are soft magnetic materials made by mixing and pressing ferromagnetic powder particles with an insulating medium. They are widely used in the production of various electronic components such as communications, energy, automotive, home appliances, automatic door control, inductors, filters, current transformers, and inverters. There are many methods for preparing metal magnetic powder, but the main ones are mechanical crushing, water atomization, and gas atomization. Metal powders prepared by mechanical crushing and water atomization have irregular shapes and good formability, but the surface of the magnetic powder is not easily coated with a film, resulting in higher eddy current losses and higher oxygen content. Gas-atomized metal powders are spherical, have low oxygen content, and are easily coated with an insulating film, but their formability is poor. Furthermore, after high-pressure molding, the spherical magnetic powder undergoes severe deformation, causing the insulating film pre-coated on the surface of the magnetic powder particles to rupture, leading to a decrease in magnetic properties.

[0003] In the early stages of magnetic powder core production, the magnetic powder alloy needs to be smelted, cooled and shaped, crushed into a master ingot, and then ground by air jet milling or atomized by an atomizer to obtain the raw materials for the magnetic powder core. For example, the molten steel used to smelt the magnetic powder alloy is usually poured into a cooling chamber and solidified from the outside to the inside of the chamber to form a blank ingot. Air jet milling refers to a device that uses high-pressure airflow to cause the material to collide within a cavity, thereby crushing it and forming powder.

[0004] In the current technology, the powder is usually screened after atomization powder production to separate powders that do not meet the size requirements. However, the screening devices currently used are prone to clogging and have poor screening effect, which reduces product quality and is not conducive to the promotion and use of the device. Summary of the Invention

[0005] The purpose of this invention is to provide a screening device to solve the technical problems of current screening devices, such as easy clogging, poor screening effect, reduced product quality, and difficulty in promoting and using the device.

[0006] The objective of this invention can be achieved through the following technical solution: a screening device, comprising vibrating motors placed on both sides of the bottom end of a housing, wherein the housing and the bottom plate are connected by equidistantly distributed first springs, and further comprising:

[0007] A primary screening assembly is installed on the outer wall of the housing and is used for primary screening of magnetic powder alloys.

[0008] A secondary screening assembly includes an inclined filter screen placed on the inner wall of the chamber, with one side of the top of the inclined filter screen extending to an opening on the outer wall of the chamber, and used for secondary screening of magnetic powder alloy.

[0009] A dust collection mechanism includes a guide pipe located at the top of the housing. The guide pipe is fixed to the fan and one end of its outer wall extends into the static layer. It is used to recycle and utilize the dust generated during the conveying of magnetic powder alloy.

[0010] Furthermore, the primary screening assembly includes a side plate fixed to the housing, a first motor connected to the side plate, the output shaft of the first motor connected to the active rotating gear, the outer wall of the active rotating gear meshing with a driven rotating gear fixed to the central shaft, one end of the driven rotating gear extending into a rolling groove in the inner wall of the side plate, and the other end fixed to the sleeve.

[0011] Furthermore, a matching conical hopper is connected to the top of the sleeve, the bottom of the conical hopper extends into the filter cylinder inside the sleeve, and a powder valve is connected to the conical hopper. A telescopic tube is installed on the outer wall of the sleeve, located below the central shaft. Both ends of the telescopic tube are connected to the sleeve through an electric push rod. As the electric push rod is activated, the telescopic tube and the feed inlet of the box are closed or separated.

[0012] Furthermore, the secondary screening component also includes a triangular plate placed on the inner wall of the box and located directly above the inclined filter screen. The triangular plate has a diversion groove that runs through its interior. A second motor is fixedly installed on the outer wall of the box. The output shaft of the second motor and the transmission roller are connected by a conveyor belt. One end of the output shaft of the second motor and the transmission roller both pass through the box and extend to the first reciprocating screw and the second reciprocating screw on the inner wall of the box, respectively.

[0013] Furthermore, both the first and second reciprocating lead screws are helically driven with lead screw nuts fixed on the crossbeam. The bottom end of the crossbeam is respectively fixed with a first cleaning brush and a second cleaning brush connected to a triangular plate and an inclined filter screen. The first and second cleaning brushes are both fitted with bristles by adhesive fixation.

[0014] Furthermore, the protrusions at both ends of the crossbeam are connected to sliding grooves along the length of the inner wall of the box. As the second motor starts, the first cleaning brush performs horizontal reciprocating cleaning work on the triangular plate, while the second cleaning brush performs horizontal reciprocating cleaning work on the inclined filter screen.

[0015] Furthermore, a first collection box is installed on the bottom plate below the opening on the outer wall of the box. The bottom end of the first collection box and the second collection box are connected by a discharge pipe, and the second collection box and the inlet at the top of the box are connected by a first screw conveyor.

[0016] Furthermore, the inner wall of the stationary layer is connected with staggered and equidistantly distributed stationary plates in the height direction. Below the stationary plates, there are symmetrically arranged support plates placed on the inner wall of the guide tube. An arc-shaped rubber pad is installed at one end of the support plate near the center of the guide tube, and the support plate is connected to the inner wall of the guide tube by a second spring.

[0017] Furthermore, a third collection box is provided below the guide pipe and placed on the bottom plate. The third collection box is connected to the feed inlet at the top of the box via a second screw conveyor.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention designs a vibrating motor, a first spring, a primary screening component, and a secondary screening component. First, the powder is poured into the filter cylinder through a conical hopper, and the powder valve is closed. Then, under the starting of the first motor, the sleeve on the central shaft can rotate through the meshing transmission between gears. At the same time, the transmission ratio between the driving gear and the driven gear can be set according to the actual situation, which can prevent the rotation speed from being too fast and ensure stable transmission, thereby achieving the effect of vibrating screening. Then, under the action of the electric push rod, the screened powder falls into the box through the telescopic tube due to gravity and slides down for secondary screening.

[0020] 2. When the powder enters the chamber, the diversion groove on the triangular plate can effectively guide the powder flow, evenly spreading it onto the inclined filter screen. Under the action of the vibrating motor, the inclined filter screen can perform secondary vibration screening of the powder. Powder that does not meet the required size can slide down into the first collection box under vibration, and then be conveyed into the chamber for re-screening by the first screw conveyor on the second collection box. In addition, during the pouring process, "dust phenomenon" is inevitable. The floating powder falls onto the support plate through the static layer. Due to the staggered and inclined distribution of the static plates in the static layer, multiple partitioned static spaces can be formed. The powder will eventually accumulate on the support plate. When a certain amount has accumulated, due to gravity, the support plate rotates downward and pours the powder into the third collection box. Under the action of the second screw conveyor, the powder is poured into the chamber for re-screening.

[0021] 3. To address the technical problems of easy clogging and poor screening effect in the screening mechanism, a cleaning mechanism is designed. Under the action of the second motor, the first and second reciprocating screws can rotate. Under the action of screw transmission, the first and second cleaning brushes can move back and forth. This can clean the inclined filter screen in a timely manner, clearing the blocked filter holes. At the same time, it can also clean the gaps on the triangular plate to prevent powder accumulation. The bristles on the first and second cleaning brushes are connected by adhesive fixation, which facilitates the installation and disassembly of the structural components, making replacement convenient and improving the practical effect of the device. Attached Figure Description

[0022] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the structure of an automated feeding and conveying device in one embodiment of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of an automated feeding and conveying device in one embodiment of the present invention. Figure 2 ;

[0025] Figure 3 This is a front view of an automated feeding and conveying device according to an embodiment of the present invention;

[0026] Figure 4 For the present invention Figure 1 Enlarged view of point A in the middle;

[0027] Figure 5 For the present invention Figure 1 Enlarged view at point B in the middle;

[0028] Figure 6 This is a schematic diagram of the interior of the box in one embodiment of the present invention;

[0029] Figure 7 For the present invention Figure 6 Enlarged view at point C;

[0030] Figure 8 For the present invention Figure 6 Enlarged view at point D;

[0031] Figure 9 This is a schematic diagram of the interior of the sleeve in one embodiment of the present invention;

[0032] Figure 10 This is a schematic diagram of the static layer in one embodiment of the present invention;

[0033] Figure 11 This is a schematic diagram of the structure of the first screw conveyor in one embodiment of the present invention. Attached Figure Description

[0035] 1. Housing; 2. Vibrating motor; 3. First spring; 4. Primary screening assembly; 5. Secondary screening assembly; 6. Inclined filter screen; 7. Dust collection mechanism; 8. Fan; 9. Settling layer; 10. First motor; 11. Driving gear; 12. Central shaft; 13. Driven gear; 14. Sleeve; 15. Conical hopper; 16. Filter cartridge; 17. Powder valve; 18. Telescopic pipe; 19. Electric push rod; 20. Triangular plate; 21. Diverter trough; 22. 23. Second motor; 24. Drive roller; 25. First reciprocating screw; 26. Second reciprocating screw; 27. Crossbeam; 28. Screw nut; 29. ​​First cleaning brush; 30. Second cleaning brush; 31. Brush bristles; 32. Slide groove; 33. First collection box; 34. Second collection box; 35. First screw conveyor; 36. Stationary plate; 37. Support plate; 38. Arc-shaped rubber pad; 39. Second spring; 40. Third collection box; 41. Second screw conveyor. Detailed Implementation

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] Reference manual attached Figures 1-11 A screening device includes a vibrating motor 2 placed on both sides of the bottom end of a housing 1. The housing 1 and the bottom plate are connected by equidistantly distributed first springs 3. The device also includes: a primary screening assembly 4, which is installed on the outer wall of the housing 1 and is used for primary screening of magnetic powder alloy; and a secondary screening assembly 5, which includes an inclined filter screen 6 placed on the inner wall of the housing 1. One side of the top of the inclined filter screen 6 extends to an opening on the outer wall of the housing 1 and is used for secondary screening of the magnetic powder alloy.

[0039] The dust collection mechanism 7 includes a guide pipe located at the top of the housing 1. The guide pipe is fixed on the fan 8 and one end of its outer wall extends into the settling layer 9. It is used to recycle the dust generated during the conveying of magnetic powder alloy.

[0040] The primary screening component 4 includes a side plate fixed to the housing 1. A first motor 10 is connected to the side plate. The output shaft of the first motor 10 is connected to the active rotating gear 11. The outer wall of the active rotating gear 11 meshes with a driven rotating gear 13 fixed to the central shaft 12. One end of the driven rotating gear 13 extends into the rolling groove on the inner wall of the side plate, and the other end is fixed to the sleeve 14. The top of the sleeve 14 is connected to a matching conical hopper 15. The bottom end of the conical hopper 15 extends into the filter cartridge 16 inside the sleeve 14, and a powder valve 17 is connected to the conical hopper 15. A telescopic tube 18 is installed on the outer wall of the sleeve 14 and is located below the central shaft 12. Both ends of the telescopic tube 18 are connected to the sleeve 14 through an electric push rod 19. When the electric push rod 19 is activated, the telescopic tube 18 and the feed inlet of the housing 1 are closed or separated.

[0041] The transmission ratio of the driving gear 11 and the driven gear 13 can be set to 2:1 or 3:1. This can reduce the rotation speed and prevent the central shaft 12 from driving the sleeve 14 to rotate too fast. After the powder is screened in the filter cartridge 16, the valve on the telescopic tube 18 can be opened and the electric push rod 19 can be started at the same time, so that the telescopic tube 18 extends to the feed port at the top of the box 1. Moreover, when the sleeve 14 starts to rotate, the telescopic tube 18 can be retracted by the electric push rod 19 to prevent the telescopic tube 18 from interfering with the box 1 during rotation, thereby affecting the normal rotation of the sleeve 14.

[0042] This invention designs a vibration motor 2, a first spring 3, a primary screening component 4, and a secondary screening component 5. First, the powder is poured into the filter cylinder 16 through the conical hopper 15, and the powder valve 17 is closed. Then, under the start of the first motor 10, the sleeve 14 on the central shaft 12 can rotate through the meshing transmission between gears. At the same time, the transmission ratio between the active rotating gear 11 and the driven rotating gear 13 can be set according to the actual situation, which can prevent the rotation speed from being too fast and ensure stable transmission, thereby achieving the effect of vibration screening. Then, under the action of the electric push rod 19, the screened powder falls into the box 1 through the telescopic tube 18 due to gravity and slides down for secondary screening.

[0043] The conical hopper 15 has a shape that can increase the contact area with the powder, thereby preventing the powder from falling to the outside when it is poured in, thus avoiding waste of resources. At the same time, the first motor 10 on the side plate is essentially a servo motor, which allows the active rotating gear 11 on the first motor 10 to rotate in both directions, thus facilitating the back-and-forth rotation of the sleeve 14. The sleeve 14 is equipped with a filter cylinder 16 for screening, so that the screened powder will slide into the telescopic tube 18 by gravity and then wait for secondary screening.

[0044] Example 2

[0045] Reference manual attached Figure 1 Appendix Figure 2 Appendix Figure 6 Appendix Figure 7 and attached Figure 8 The secondary screening component 5 also includes a triangular plate 20 placed on the inner wall of the housing 1 and located directly above the inclined filter screen 6. A diversion groove 21 is provided on the triangular plate 20, which penetrates its interior. A second motor 22 is fixedly installed on the outer wall of the housing 1. The output shaft of the second motor 22 and the transmission roller 23 are connected by a conveyor belt. One end of the output shaft of the second motor 22 and the transmission roller 23 both penetrate the housing 1 and extend to the first reciprocating screw 24 and the second reciprocating screw 25 on the inner wall of the housing 1, respectively.

[0046] Both the first reciprocating screw 24 and the second reciprocating screw 25 are screw-driven with screw nuts 27 fixed on the crossbeam 26. The bottom end of the crossbeam 26 is respectively fixed with a first cleaning brush 28 and a second cleaning brush 29 connected to the triangular plate 20 and the inclined filter screen 6. The first cleaning brush 28 and the second cleaning brush 29 are both fixed with bristles 30 by adhesive. The protrusions at both ends of the crossbeam 26 are connected with sliding grooves 31 along the length of the inner wall of the housing 1. When the second motor 22 starts, the first cleaning brush 28 performs horizontal reciprocating cleaning work on the triangular plate 20, and at the same time, the second cleaning brush 29 performs horizontal reciprocating cleaning work on the inclined filter screen 6.

[0047] When the powder enters the housing 1, the diversion groove 21 on the triangular plate 20 can effectively guide the powder flow, evenly spreading it onto the inclined filter screen 6. Under the action of the vibrating motor 2, the inclined filter screen 6 can perform secondary vibration screening of the powder. Powder that does not meet the size requirements can slide into the first collection box 32 under vibration. Powder with an outer diameter greater than 0.25mm will be effectively separated and blocked by the inclined filter screen 6, allowing powder that does not meet the size requirements to fall into the first collection box 32. Then, the powder is transported to the housing 1 for re-screening by the first screw conveyor 34 on the second collection box 33. In addition, dust will inevitably be generated during the powder pouring process. The floating powder falls onto the support plate 36 through the settling layer 9. Due to the staggered and inclined distribution of the settling plates 35 in the settling layer 9, multiple partitioned settling spaces can be formed. The powder will eventually accumulate on the support plate 36. When a certain amount has accumulated, the support plate 36 rotates downward due to gravity and pours the powder into the third collection box 39. Under the action of the second screw conveyor 40, the powder is poured into the box 1 for re-screening. At the same time, due to the tension of the second spring 38 at the bottom of the support plate 36, the two support plates 36 can be automatically returned to their original positions. Moreover, an arc-shaped rubber pad 37 is provided at one end of the outer wall of the support plate 36, which ensures normal rotation at the connection and also ensures the sealing of the connection between the two.

[0048] A first collection box 32 is installed on the bottom plate below the opening on the outer wall of the box 1. The bottom end of the first collection box 32 is connected to the second collection box 33 via a discharge pipe. The second collection box 33 is connected to the feed inlet at the top of the box 1 via a first screw conveyor 34. The second collection box 33 can serve as a transition adjustment. In addition, the discharge pipe between the bottom end of the first collection box 32 and the second collection box 33 is inclined, so that the powder can fall into the second collection box 33 by its own gravity and then be vertically conveyed by the first screw conveyor 34, thereby transporting the powder to the box 1 for re-screening.

[0049] The inner wall of the settling layer 9 is connected with staggered and equidistant settling plates 35. Below the settling plates 35, there are symmetrically arranged support plates 36 placed on the inner wall of the feed pipe. An arc-shaped rubber pad 37 is installed at one end of the support plate 36 near the center of the feed pipe. The support plate 36 is connected to the inner wall of the feed pipe by a second spring 38. The floating powder is transported to the settling layer 9 by the action of the blower 8. This not only prevents the powder from clogging in the feed pipe, but also enables stable and effective powder transport. The settling layer 9 is divided into multiple settling spaces by the staggered settling plates 35. Moreover, the settling plates 35 are inclined, so the powder will not accumulate on them. In this way, the powder will eventually settle and fall onto the support plate 36, which makes it easy to pour into the third collection box 39 for collection. This effectively utilizes resources and avoids resource waste.

[0050] A third collection box 39 is placed on the bottom plate below the feed pipe. The third collection box 39 is connected to the feed inlet at the top of the box 1 through a second screw conveyor 40. The second screw conveyor 40 is also set for vertical conveying, so as to transport the powder to the box 1 for re-screening. A fixing frame is set between the feed pipe and the box 1, and both ends of the fixing frame are fixed to the box 1 and the feed pipe by bolt assembly. This setting method can effectively and quickly install and fix, increase the stability between structural components, and facilitate personnel operation.

[0051] Example 3

[0052] Reference manual attached Figure 1 Appendix Figure 2 Appendix Figure 3 and attached Figure 5To address the technical problems of easy clogging and poor screening effect in the screening mechanism, a cleaning mechanism is designed. Under the action of the second motor 22, the first reciprocating screw 24 and the second reciprocating screw 25 can rotate. Under the action of screw transmission, the first cleaning brush 28 and the second cleaning brush 29 can move back and forth. This can clean the inclined filter screen 6 in a timely manner and clear the blocked filter holes. At the same time, it can clean the gaps on the triangular plate 20 to prevent powder accumulation. The bristles 30 on the first cleaning brush 28 and the second cleaning brush 29 are connected by adhesive fixing, which facilitates the installation and disassembly of the structural components, makes replacement convenient, and improves the practical effect of the device.

[0053] The output shaft of the second motor 22 and the first reciprocating screw 24, as well as the second reciprocating screw 25 and the transmission roller 23, are fixedly connected by couplings. Under the action of the second motor 22, the output shaft of the second motor 22 is connected to the transmission roller 23 through the conveyor belt, thereby making the first reciprocating screw 24 and the second reciprocating screw 25 move. Moreover, with the help of the helical transmission of the screw nut 27, the crossbeam 26 connected to the screw nut 27 can move back and forth horizontally, thereby performing effective cleaning work.

[0054] The top of the box 1 is equipped with a collection cover for the feed pipe, which can increase the contact area with the floating powder. At the same time, the fan on the feed pipe rotates at a low speed to provide a certain guiding force to the powder, and also to avoid secondary "dust" caused by excessive rotation speed.

[0055] The triangular plate 20 has a flow-diverting groove 21 that runs through its interior. The flow-diverting groove 21 serves to guide the powder as it falls into the inclined filter screen 6, and can also distribute the powder evenly on the inclined filter screen 6. At the same time, the triangular plate 20 is detachably installed and fixed to the inner wall of the box 1, which is convenient for disassembly and maintenance. Meanwhile, the protrusions at both ends of the crossbeam 26 are connected to the sliding grooves 31 along the length of the inner wall of the box 1. The sliding grooves 31 on the inner wall of the box 1 are concave. In this way, the crossbeam 26 can effectively prevent the position deviation of the transmission components during the movement, ensuring the accuracy of the movement position, while also providing the crossbeam 26 with corresponding support force and providing the structural connecting components with corresponding movement space.

[0056] The output shaft of the second motor 22 and one end of the transmission roller 23 both pass through the housing 1 and extend to the first reciprocating screw 24 and the second reciprocating screw 25 on the inner wall of the housing 1, respectively. One end of the first reciprocating screw 24 and the second reciprocating screw 25 are respectively fixed on the conveying shaft of the second motor 22 and the transmission roller 23, and the other end is respectively connected to a rolling groove placed in the inner wall of the housing 1. At the same time, the outer edge of the first reciprocating screw 24 and the second reciprocating screw 25 is provided with a sealing ring placed in the inner wall of the housing 1, thereby ensuring the sealing of the connection.

[0057] The output shaft of the second motor 22 and the transmission roller 23 are connected by a conveyor belt. The transmission ratio between the output shaft of the second motor 22 and the transmission roller 23 is kept the same. This allows the first reciprocating screw 24 and the second reciprocating screw 25 to rotate synchronously at the same speed. It also allows the first cleaning brush 28 and the second cleaning brush 29 to move horizontally synchronously, thereby facilitating effective cleaning operations and improving the application effect of the device.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0059] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A screening device comprising a vibrating motor placed on both sides of the bottom end of a box, said box and the bottom plate being connected by means of equidistantly distributed first springs, characterized in that, Also include: Primary screening assembly, the primary screening assembly is installed on the outer wall of the box, and is used for primary screening of magnetic powder alloy; Secondary screening assembly, the secondary screening assembly includes an inclined screen placed on the inner wall of the box, the top end of the inclined screen extends to the opening on the outer wall of the box, and is used for secondary screening of the magnetic powder alloy; Dust collection mechanism, the dust collection mechanism includes a guide pipe at the top end of the box, the guide pipe is fixed on the fan and extends to the static layer at one end of the outer wall, and is used for recycling the dust generated during the feeding of the magnetic powder alloy; The primary screening assembly includes a side plate fixed on the box, the side plate is connected with a first motor, the output shaft of the first motor is connected with a driving gear, the outer wall of the driving gear is engaged with a driven gear fixed on the central shaft, one end of the driven gear extends into the rolling groove in the inner wall of the side plate, and the other end is fixed on the sleeve; The top end of the sleeve is connected with a conical hopper matched therewith, the bottom end of the conical hopper extends into the filter cartridge in the sleeve, and a powder valve is connected on the conical hopper, a telescopic pipe is installed on the outer wall of the sleeve below the central shaft, and the two ends of the telescopic pipe and the sleeve are connected by an electric push rod, and when the electric push rod is started, the telescopic pipe and the inlet of the box are closed or separated from each other; The inner wall of the static layer is connected with a plurality of static plates distributed at equal intervals, the static plates are provided with symmetrically arranged support plates on the inner wall of the guide pipe, and the support plates are provided with arc-shaped rubber pads near the center of the guide pipe.

2. A screening device according to claim 1, characterized in that The secondary screening assembly further includes a triangular plate placed on the inner wall of the box above the inclined screen, the triangular plate is provided with a shunt groove penetrating through the inside thereof, and a second motor is fixedly installed on the outer wall of the box, the output shaft of the second motor and the transmission roller are connected by a conveying belt, and the output shaft of the second motor and one end of the transmission roller penetrate through the box and extend to the first and second reciprocating lead screws on the inner wall of the box.

3. A screening apparatus according to claim 2, wherein, The first and second reciprocating lead screws are spirally connected with lead screw nuts fixed on the cross beam, the first and second cleaning brushes connected with the triangular plate and the inclined screen are fixedly installed at the bottom end of the cross beam, and the first and second cleaning brushes are provided with bristles by viscous fixation.

4. A screening apparatus according to claim 3, wherein, The protrusions at the two ends of the cross beam are connected with sliding grooves along the length direction of the inner wall of the box, and when the second motor is started, the first cleaning brush performs horizontal reciprocating cleaning work on the triangular plate, and the second cleaning brush performs horizontal reciprocating cleaning work on the inclined screen.

5. A screening device according to claim 1, wherein The bottom plate is provided with a first collecting box below the opening on the outer wall of the box, the bottom end of the first collecting box and the second collecting box are connected by a discharge pipe, and the second collecting box and the inlet at the top end of the box are connected by a first screw conveyor.

6. A screening device according to claim 1, wherein The bottom of the guide pipe is provided with a third collecting box placed on the bottom plate, and the third collecting box and the inlet at the top end of the box are connected by a second screw conveyor.

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