Finished graphene material multi-screening mechanism

Abstract

The invention relates to a finished graphene material repeated screening mechanism, and relates to the technical field of graphene material screening, the finished graphene material repeated screening mechanism comprises a discharging pipe, the lower end of the discharging pipe is fixedly connected with a first butterfly valve, the output end of the first butterfly valve is fixedly connected with a material storage pipe, and the lower end of the material storage pipe is fixedly connected with a second butterfly valve; the output end of the second butterfly valve is fixedly connected with a screening box, a primary screening assembly and a second screening assembly are arranged in the screening box, the primary screening assembly comprises a first limiting frame, a fence and a flexible screen, and a dredging assembly is arranged below the flexible screen. Through the dredging assembly, non-stop dredging of the screen is achieved, the screen is prevented from being blocked, the back face of the screen is continuously knocked along with left-right shaking of the screen to make the screen vibrate longitudinally, the dredging effect and efficiency are improved, screen blocking is avoided, meanwhile, the design of double butterfly valves is adopted, intermittent screening of materials is achieved, and the screening efficiency is improved. And the screen mesh blockage caused by one-time filling of a large number of graphite flake fine particles is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of graphene material screening, in particular to a multi-screening mechanism for finished graphene materials. Background Art

[0002] Due to its unique electrical, mechanical, and thermal properties, graphene has shown great application potential in electronics, energy, composite materials, and other fields. However, during its industrial production process, due to the complexity of the preparation process, the output graphene materials often have problems such as uneven particle size, residual impurities, and flake agglomeration, which directly affect the material performance and application effect. Therefore, the classification and purification of graphene materials through effective screening processes has become a key link in promoting its industrial development. The screening process of finished graphene materials is of great significance to the industrialization of graphene. It can effectively improve the purity of materials, ensure the uniformity of particle size, and eliminate the application risks caused by fluctuations in material properties. Through customized screening solutions, it can meet the differentiated needs of graphene in multiple fields such as electronic information, energy storage, and composite materials. This process supports continuous and automated production, reduces waste recycling, and significantly improves production efficiency and economy. As the core technology of standardized graphene production, the screening mechanism of finished graphene materials has laid a solid foundation for promoting the large-scale application of materials and breaking through technical bottlenecks in high-end fields.

[0003] Upon investigation, the disclosure (announcement) number: CN116078481B discloses "a graphene processing grinding device capable of simultaneous screening". This technology discloses "including a mounting plate one, the bottom of the mounting plate one is fixedly connected to a support leg; a fixing frame, the bottom of the fixing frame is fixedly connected to the top of the mounting plate one; a feeding mechanism, the feeding mechanism is arranged on one side of the top of the fixing frame; a grinding mechanism, the grinding mechanism is arranged between the fixing frame and the mounting plate; a recycling mechanism, the recycling mechanism is connected to the mounting plate one; a screening mechanism, the screening mechanism is arranged on one side of the fixing frame, and the material output by the recycling mechanism is input into the screening mechanism. Graphene grinding is achieved, and the graphene powder after processing and grinding can be automatically recovered and automatically screened, which reduces the workload of operators, further improves the efficiency of powder screening after graphene processing and grinding, and is more convenient to use."

[0004] Although the above technical solution can realize the automatic recovery and automatic screening of graphene powder, reduce the workload of operators, and further improve the efficiency of powder screening after graphene processing and grinding, it is unable to clear the screen. The screen used for a long time is prone to blockage, thereby affecting the screening efficiency and quality. The common method is to stop the machine to replace or clean the screen. This method seriously delays the production progress and is not conducive to improving work efficiency.

[0005] In order to solve the above problems, this application proposes a multiple screening mechanism for finished graphene materials. Summary of the Invention

[0006] (1) Technical problems solved In response to the shortcomings of the existing technology, the present invention provides a multiple screening mechanism for finished graphene materials, which solves the problems of easy clogging of the screen, low screening efficiency, complex equipment maintenance and high energy consumption.

[0007] (2) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: a multiple screening mechanism for finished graphene materials, comprising a feed pipe, the lower end of which is fixedly connected to a No. 1 butterfly valve, the output end of which is fixedly connected to a storage pipe, the lower end of which is fixedly connected to a No. 2 butterfly valve, and the output end of which is fixedly connected to a screening box; A primary screening assembly and a secondary screening assembly are provided inside the screening box, the primary screening assembly includes a No. 1 limit frame, a fence and a flexible screen, the inner wall of the No. 1 limit frame is fitted with the fence, the lower surface of the fence is fixedly connected to the flexible screen, a dredging assembly is provided below the flexible screen, the dredging assembly includes a No. 2 rotating shaft, a gear and a gear, both ends of the No. 2 rotating shaft are rotatably connected to the screening box, the side surface of the No. 2 rotating shaft is fixedly connected to two symmetrically distributed gears, the side surface of the No. 2 rotating shaft is fixedly connected to a cam, and the cam is located between the two gears; The second screen assembly includes a No. 2 limit frame, a screening box and a vibrator. The inner wall of the No. 2 limit frame is fitted with the screening box. The output end of the vibrator is fixedly connected to the No. 2 limit frame. The lower surface of the vibrator is fixedly connected to the screening box.

[0008] Preferably, a reciprocating assembly is installed inside the screening box, and the reciprocating assembly includes motor No. 1, shaft No. 1, turntable, eccentric column and push-pull rod. The upper surface of the screening box is fixedly connected to motor No. 1, the output end of motor No. 1 is fixedly connected to shaft No. 1, the lower end of shaft No. 1 is fixedly connected to the turntable, the side surface of the turntable is fixedly connected to the eccentric column, the side surface of the eccentric column is hinged to the push-pull rod, and the end of the push-pull rod away from the eccentric column is hinged to the limit frame No. 1.

[0009] By adopting the above technical solution, a reciprocating assembly is set up, and the No. 1 motor is used to drive the No. 1 rotating shaft to rotate, and the No. 1 rotating shaft drives the turntable and the eccentric column to rotate. The eccentric column drives the push-pull rod to continuously push and pull the No. 1 limit frame to perform horizontal reciprocating motion, thereby shaking the graphene coarse material in the flexible screen left and right for initial screening.

[0010] Preferably, the lower surface of the No. 1 limit frame is fixedly connected to a rack, the side surface of the gear is meshed with the rack, the interior of the screening box is fixedly connected to a material guide trough, and the upper surface of the material guide trough is slidably connected to the No. 1 limit frame.

[0011] By adopting the above technical solution, a material guide trough is set to facilitate the horizontal reciprocating sliding of the No. 1 limit frame along the direction of the material guide trough. The rack is used to drive the gear meshing with it to rotate forward and reverse during the reciprocating motion. The gear drives the cam on the No. 2 rotating shaft to swing repeatedly and hit the lower surface of the flexible screen. The coarse material in the center position of the flexible screen will produce longitudinal vibration. The longitudinal vibration is used to dredge the flexible screen to prevent blockage. Under the combined action of horizontal shaking and longitudinal vibration, the screening efficiency is greatly improved.

[0012] Preferably, a material guide trough is fixedly connected to the top inner wall of the screening box, the material guide trough is connected to the output end of the No. 2 butterfly valve, and the end of the material guide trough is located above the enclosure.

[0013] By adopting the above technical solution and setting a material guide trough, the graphene coarse material can be accurately guided onto the flexible screen inside the enclosure, thereby facilitating initial screening.

[0014] Preferably, a reinforcement frame is fixedly connected to the top inner wall of the screening box, and the side surface of the No. 1 rotating shaft is rotatably connected to the reinforcement frame.

[0015] By adopting the above technical solution and setting a reinforcement frame, the No. 1 rotating shaft is not easy to bend during the rotation process, thereby improving its bending resistance and thus improving the durability of the equipment.

[0016] Preferably, the rear surface of the screening box is fixedly connected to a mounting frame, and two pushing components distributed upper and lower are installed inside the mounting frame. The pushing components include a No. 2 motor, a screw and a threaded sleeve. The output end of the No. 2 motor is fixedly connected to the screw, the side surface of the screw is threadedly connected to the threaded sleeve, and the side surface of the threaded sleeve is slidingly connected to the screening box.

[0017] By adopting the above technical solution, a pushing component is set up, and the No. 2 motor is used to drive the screw to rotate inside the threaded sleeve, pushing the threaded sleeve to slide inside the screening box, thereby pushing the enclosure or screening box out to remove the graphene material from the primary and secondary screens.

[0018] Preferably, a discharge pipe is fixedly connected to the lower surface of the screening box, and the upper end of the discharge pipe is communicated with the interior of the screening box.

[0019] By adopting the above technical solution, a discharge pipe is provided to facilitate the discharge of the screened graphene material.

[0020] Preferably, the side surface of the screening box is fixedly connected with a support leg, the lower end of the support leg is fixedly connected with a frame, a conveyor belt is installed inside the frame, and a charging bucket is provided on the upper surface of the conveyor belt.

[0021] By adopting the above technical solution, the loading bucket is set below the discharge pipe, which makes it convenient for the discharge pipe to load the screened fine material into the loading bucket, and then use the conveyor belt to transport the loading bucket to the next process, which greatly improves the efficiency of loading and transportation.

[0022] (3) Beneficial effects In summary, this application includes at least one of the following beneficial technical effects: 1. The multiple screening mechanism for finished graphene materials can realize the non-stop dredging of the screen by designing the dredging components to prevent the screen from being blocked under long-term use. In addition, as the screen swings left and right, it continuously hits the back of the filter so that the filter can vibrate longitudinally while swinging horizontally, which greatly improves the cleaning effect and screening efficiency. At the same time, the non-stop dredging also reduces the steps and time of shutdown maintenance, greatly improves the equipment operation efficiency, effectively avoids the problem of screen blockage, and further improves the screening efficiency.

[0023] 2. The multiple screening mechanism for finished graphene materials utilizes a double butterfly valve design, where only one of the two butterfly valves can be opened at the same time. This allows for staged storage of graphene particles and intermittent screening of materials, preventing congestion of the screen caused by a large amount of graphite flake particles being poured in at one time. Intermittent screening can also screen a fixed amount of graphene particles more evenly and effectively, ensuring screening quality and reducing waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial structural schematic diagram of the present invention; Figure 3 Schematic diagram of the internal structure of the screening box of the present invention; Figure 4 It is a schematic structural diagram of the reciprocating assembly of the present invention; Figure 5 It is a schematic structural diagram of the dredging component of the present invention; Figure 6 This is a schematic diagram of the flexible screen structure of the present invention; Figure 7 for Figure 1 A schematic diagram of the structure at center A; Figure 8 for Figure 4 A magnified schematic diagram of the structure at point B in the middle.

[0025] Description of reference numerals: 1. Feeding pipe; 2. Butterfly valve No. 1; 3. Material storage pipe; 4. Butterfly valve No. 2; 5. Screening box; 6. Limit frame No. 1; 7. Baffle; 8. Flexible screen; 9. Limit frame No. 2; 10. Screening box; 11. Vibrator; 12. Motor No. 1; 13. Rotating shaft No. 1; 14. Turntable; 15. Eccentric column; 16. Push-pull rod; 17. Rotating shaft No. 2; 18. Gear; 19. Cam; 20. Rack; 21. Guide trough; 22. Reinforcement frame; 23. Mounting frame; 24. Motor No. 2; 25. Screw; 26. Threaded sleeve; 27. Feeding pipe; 28. Support leg; 29. ​​Frame; 30. Conveyor belt; 31. Loading barrel. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 -Attached Figure 8 , further details of this application are given.

[0027] Example: Finished graphene material multiple screening mechanism, refer to Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , including a discharge pipe 1, the lower end of the discharge pipe 1 is fixedly connected to a No. 1 butterfly valve 2, the output end of the No. 1 butterfly valve 2 is fixedly connected to a storage pipe 3, the lower end of the storage pipe 3 is fixedly connected to a No. 2 butterfly valve 4, and the output end of the No. 2 butterfly valve 4 is fixedly connected to a screening box 5.

[0028] The interior of the screening box 5 is provided with a primary screening component and a secondary screening component. The primary screening component includes a No. 1 limit frame 6, a barrier 7 and a flexible screen 8. The inner wall of the No. 1 limit frame 6 is in contact with the barrier 7. The lower surface of the barrier 7 is fixedly connected to the flexible screen 8. A dredging component is provided below the flexible screen 8. The dredging component includes a No. 2 rotating shaft 17, a gear 18 and a gear 18. Both ends of the No. 2 rotating shaft 17 are rotatably connected to the screening box 5. The side surface of the No. 2 rotating shaft 17 is fixedly connected to two symmetrically distributed gears 18. The side surface of the No. 2 rotating shaft 17 is fixedly connected to the cam 19, and the cam 19 is located between the two gears 18.

[0029] The second screening assembly includes a No. 2 limiting frame 9, a screening box 10 and a vibrating machine 11. The inner wall of the No. 2 limiting frame 9 is fitted with the screening box 10, the output end of the vibrating machine 11 is fixedly connected to the No. 2 limiting frame 9, and the lower surface of the vibrating machine 11 is fixedly connected to the screening box 5.

[0030] Reference Figure 3 、 Figure 4 and Figure 8The screen box 5 is provided with a reciprocating assembly inside, and the reciprocating assembly includes a No. 1 motor 12, a No. 1 rotating shaft 13, a turntable 14, an eccentric column 15 and a push-pull rod 16. The upper surface of the screen box 5 is fixedly connected to the No. 1 motor 12, and the output end of the No. 1 motor 12 is fixedly connected to the No. 1 rotating shaft 13, and the lower end of the No. 1 rotating shaft 13 is fixedly connected to the turntable 14, and the side surface of the turntable 14 is fixedly connected to the eccentric column 15, and the side surface of the eccentric column 15 is hinged to the push-pull rod 16, and the end of the push-pull rod 16 away from the eccentric column 15 is hinged to the No. 1 limit frame 6. By setting a reciprocating assembly, the No. 1 motor 12 drives the No. 1 rotating shaft 13 to rotate, and the No. 1 rotating shaft 13 drives the turntable 14 and the eccentric column 15 to rotate, and the eccentric column 15 drives the push-pull rod 16 to continuously push and pull the No. 1 limit frame 6 to perform reciprocating motion in the horizontal direction, thereby shaking the graphene coarse material in the flexible screen 8 left and right for preliminary screening.

[0031] Reference Figure 3 、 Figure 4 and Figure 5 The lower surface of the No. 1 limit frame 6 is fixedly connected with a rack 20, and the side surface of the gear 18 is meshed with the rack 20. The interior of the screening box 5 is fixedly connected with a guide trough 21, and the upper surface of the guide trough 21 is slidably connected to the No. 1 limit frame 6. By setting the guide trough 21, it is convenient for the No. 1 limit frame 6 to slide back and forth horizontally along the direction of the guide trough 21. The rack 20 drives the gear 18 meshing with it to rotate forward and backward during the reciprocating motion. The gear 18 drives the cam 19 on the No. 2 rotating shaft 17 to swing repeatedly and hit the lower surface of the flexible screen 8. The coarse material at the center position inside the flexible screen 8 will Generate longitudinal vibration, use longitudinal vibration to dredge the flexible screen 8 to prevent blockage, and under the combined action of horizontal shaking and longitudinal vibration, greatly improve the efficiency of screening, the top inner wall of the screening box 5 is fixedly connected with a guide trough 21, the guide trough 21 is connected to the output end of the No. 2 butterfly valve 4, and the end of the guide trough 21 is located above the enclosure 7. By setting the guide trough 21, the graphene coarse material can be accurately introduced into the flexible screen 8 in the enclosure 7, thereby facilitating the initial screening, and the top inner wall of the screening box 5 is fixedly connected with a reinforcement frame 22, and the side surface of the No. 1 rotating shaft 13 is rotatably connected to the reinforcement frame 22. By setting the reinforcement frame 22, the No. 1 rotating shaft 13 is not easy to bend during the rotation process, thereby improving its bending resistance and thus improving the durability of the equipment.

[0032] Reference Figure 1 、 Figure 2 and Figure 7The rear surface of the screening box 5 is fixedly connected to a mounting frame 23, and two pushing components distributed up and down are installed inside the mounting frame 23. The pushing component includes a No. 2 motor 24, a screw 25 and a threaded sleeve 26. The output end of the No. 2 motor 24 is fixedly connected to the screw 25, and the side surface of the screw 25 is threadedly connected to the threaded sleeve 26. The side surface of the threaded sleeve 26 is slidingly connected to the screening box 5. By setting up the pushing component, the No. 2 motor 24 is used to drive the screw 25 to rotate inside the threaded sleeve 26, pushing the threaded sleeve 26 to slide toward the inside of the screening box 5, thereby pushing the enclosure 7 or the screening box 10 out to take out the graphene materials of the primary and secondary screens.

[0033] Reference Figure 1 The lower surface of the screening box 5 is fixedly connected with a discharge pipe 27, and the upper end of the discharge pipe 27 is communicated with the interior of the screening box 5. By setting the discharge pipe 27, the graphene material that has been screened is easily discharged, and the side surface of the screening box 5 is fixedly connected with a support leg 28, and the lower end of the support leg 28 is fixedly connected with a frame 29. A conveyor belt 30 is installed inside the frame 29, and a loading bucket 31 is provided on the upper surface of the conveyor belt 30. By arranging the loading bucket 31 below the discharge pipe 27, the discharge pipe 27 is convenient for loading the fine material that has been screened into the loading bucket 31, and then the conveyor belt 30 is used to transport the loading bucket 31 to the next process, which greatly improves the efficiency of loading and transportation.

[0034] The implementation principle of the embodiment of the present application is as follows: the graphene material reaches the No. 1 butterfly valve 2 through the discharge pipe 1, wherein only one of the No. 1 butterfly valve 2 and the No. 2 butterfly valve 4 can be opened at the same time period, that is, first the No. 2 butterfly valve 4 is closed, the No. 1 butterfly valve 2 is opened, and after the material falls for a certain period of time, the material will accumulate in the storage pipe 3 between the No. 1 butterfly valve 2 and the No. 2 butterfly valve 4. When a certain amount of material is stored in the storage pipe 3, the No. 1 butterfly valve 2 is closed and the No. 2 butterfly valve 4 is opened. At this time, the material will accumulate on the No. 1 butterfly valve 2 and the material in the storage pipe 3 between the No. 1 butterfly valve 2 and the No. 2 butterfly valve 4. The material will drop to the guide trough 21 and be guided onto the flexible screen 8 in the enclosure 7. At this time, the No. 1 motor 12 is in operation, and the No. 1 motor 12 drives the No. 1 shaft 13 to rotate, and the No. 1 shaft 13 drives the turntable 14 to rotate, and the turntable 14 drives the eccentric column 15 to pull the push-pull rod 16 to do reciprocating motion, thereby driving the enclosure 7 in the No. 1 limit frame 6 to slide horizontally left and right, so that the material in the flexible screen 8 is shaken and screened. At the same time, the No. 1 limit frame 6 drives the rack 20 to move left and right while shaking left and right, and the rack 20 drives the gear 1 in the process of moving. 8 reciprocates, and the gear 18 drives the cam 19 on the second rotating shaft 17 to swing back and forth, thereby striking the bottom of the flexible screen 8. The material at the center position inside the flexible screen 8 will produce longitudinal vibration, and the flexible screen 8 is cleared by the longitudinal vibration to prevent blockage. Moreover, under the combined effect of horizontal shaking and longitudinal vibration, the screening efficiency is greatly improved. The material after the initial screening falls into the screening box 10 below. At this time, the vibrator 11 is in the starting state to vibrate the material in the screening box 10 to achieve secondary screening, and finally passes through the discharge pipe 27 below. Inject it into the corresponding loading barrel 31, and start the conveyor belt 30 to transport the loading barrel 31 loaded with genuine graphene material to the next process, that is, the manual inspection link, thereby further ensuring the purity of the material and improving the product quality. When the loading amount in the enclosure 7 or the screening box 10 reaches the upper limit, the corresponding No. 1 butterfly valve 2 can be started to drive the screw 25 to rotate inside the threaded sleeve 26 and push the threaded sleeve 26 to extend into the screening box 5. During the extension process, the threaded sleeve 26 pushes out the corresponding enclosure 7 or screening box 10, thereby facilitating unloading.

[0035] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A multiple screening mechanism for finished graphene materials, comprising a feed pipe (1), characterized in that: The lower end of the discharge pipe (1) is fixedly connected to a No. 1 butterfly valve (2), the output end of the No. 1 butterfly valve (2) is fixedly connected to a storage pipe (3), the lower end of the storage pipe (3) is fixedly connected to a No. 2 butterfly valve (4), and the output end of the No. 2 butterfly valve (4) is fixedly connected to a screening box (5); The screening box (5) is provided with a primary screening component and a secondary screening component inside, the primary screening component including a No. 1 limit frame (6), a fence (7) and a flexible screen (8), the inner wall of the No. 1 limit frame (6) is fitted with the fence (7), the lower surface of the fence (7) is fixedly connected to the flexible screen (8), a dredging component is provided below the flexible screen (8), the dredging component including a No. 2 rotating shaft (17), a gear (18) and a gear (18), both ends of the No. 2 rotating shaft (17) are rotatably connected to the screening box (5), the side surface of the No. 2 rotating shaft (17) is fixedly connected to two symmetrically distributed gears (18), the side surface of the No. 2 rotating shaft (17) is fixedly connected to a cam (19), and the cam (19) is located between the two gears (18); The second screen assembly comprises a second limit frame (9), a screening box (10) and a vibrator (11), wherein the inner wall of the second limit frame (9) is fitted with the screening box (10), the output end of the vibrator (11) is fixedly connected to the second limit frame (9), and the lower surface of the vibrator (11) is fixedly connected to the screening box (5).

2. The finished graphene material multiple screening mechanism according to claim 1, characterized in that: A reciprocating assembly is installed inside the screening box (5), and the reciprocating assembly includes a No. 1 motor (12), a No. 1 rotating shaft (13), a turntable (14), an eccentric column (15) and a push-pull rod (16). The upper surface of the screening box (5) is fixedly connected to the No. 1 motor (12), the output end of the No. 1 motor (12) is fixedly connected to the No. 1 rotating shaft (13), the lower end of the No. 1 rotating shaft (13) is fixedly connected to the turntable (14), the side surface of the turntable (14) is fixedly connected to the eccentric column (15), the side surface of the eccentric column (15) is hinged to the push-pull rod (16), and the end of the push-pull rod (16) away from the eccentric column (15) is hinged to the No. 1 limit frame (6).

3. The finished graphene material multiple screening mechanism according to claim 1, characterized in that: The lower surface of the No. 1 limit frame (6) is fixedly connected to a rack (20), the side surface of the gear (18) is meshedly connected to the rack (20), the interior of the screening box (5) is fixedly connected to a material guide trough (21), and the upper surface of the material guide trough (21) is slidably connected to the No. 1 limit frame (6).

4. The finished graphene material multiple screening mechanism according to claim 1, characterized in that: A material guide trough (21) is fixedly connected to the top inner wall of the screening box (5), and the material guide trough (21) is connected to the output end of the No. 2 butterfly valve (4). The end of the material guide trough (21) is located above the enclosure (7).

5. The finished graphene material multiple screening mechanism according to claim 2, characterized in that: The top inner wall of the screening box (5) is fixedly connected to a reinforcement frame (22), and the side surface of the first rotating shaft (13) is rotatably connected to the reinforcement frame (22).

6. The finished graphene material multiple screening mechanism according to claim 1, characterized in that: The rear surface of the screening box (5) is fixedly connected to a mounting frame (23), and two pushing components distributed up and down are installed inside the mounting frame (23). The pushing components include a No. 2 motor (24), a screw (25) and a threaded sleeve (26). The output end of the No. 2 motor (24) is fixedly connected to the screw (25), the side surface of the screw (25) is threadedly connected to the threaded sleeve (26), and the side surface of the threaded sleeve (26) is slidably connected to the screening box (5).

7. The finished graphene material multiple screening mechanism according to claim 1, characterized in that: A discharge pipe (27) is fixedly connected to the lower surface of the screening box (5), and the upper end of the discharge pipe (27) is communicated with the interior of the screening box (5).

8. The finished graphene material multiple screening mechanism according to claim 1, characterized in that: The side surface of the screening box (5) is fixedly connected to a support leg (28), the lower end of the support leg (28) is fixedly connected to a frame (29), a conveyor belt (30) is installed inside the frame (29), and a charging bucket (31) is provided on the upper surface of the conveyor belt (30).

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