Multi-stage screening device for waste copper recovery

Abstract

The invention discloses a multi-stage screening device for waste copper recovery, and relates to the technical field of screening, the multi-stage screening device comprises a multi-stage screening box, a plurality of screening plates are arranged in the multi-stage screening box at intervals in the height direction of the multi-stage screening box, the mesh diameters of the multiple screening plates are gradually reduced from top to bottom, and the screening plates are obliquely installed on the multi-stage screening box; the multistage screening box is provided with discharging windows corresponding to the screening plates, the bottom ends of the screening plates extend into the discharging windows, each screening plate is provided with a recycling mechanism, the recycling mechanism comprises a conveying pipeline, a discharging pipeline, a spiral elevator and a recycling pipeline, the spiral elevator is obliquely arranged, the high end of the conveying pipeline is connected with the discharging windows, and the high end of the recycling pipeline is connected with the discharging windows. The bottom end of the conveying pipeline is connected with a low-end feeding port of the screw elevator, one end of the recycling pipeline communicates with the multi-stage screening box, a high-end discharging port of the screw elevator communicates with the recycling pipeline, a backflow path accurately corresponds to an original screening layer, cross-stage mixing of materials with different particle sizes is avoided, and the problem of repeated screening is thoroughly solved.

Description

Technical Field

[0001] This invention relates to the field of screening technology, specifically a multi-stage screening device for waste copper recycling. Background Technology

[0002] With the increasing prominence of metal resource shortages, the recycling and reuse of scrap copper, as an important recyclable metal resource, is of great significance for conserving mineral resources, reducing energy consumption, and mitigating environmental pollution. In the scrap copper recycling and processing process, screening is a key pretreatment step. Multi-stage screening is required to classify scrap copper of different particle sizes for subsequent deep processing such as smelting and rolling, ensuring the quality stability of the finished copper products.

[0003] Currently, the industry commonly uses multi-stage screening devices for the grading of waste copper. These devices typically include a multi-stage screening box, with screening plates of gradually decreasing mesh diameter arranged along the height direction. The screening plates are installed at an angle and have corresponding discharge windows to separate and discharge waste copper of different particle sizes. However, existing multi-stage screening devices still have many shortcomings in practical applications: First, some waste copper particles may not be effectively screened in one go because their particle size is close to the screen aperture size or they are agglomerated. Existing devices lack efficient reflux screening mechanisms, and these insufficiently screened materials are easily discharged directly, resulting in insufficient grading accuracy and affecting the quality of subsequent processing. Second, although some screening devices are equipped with a circulating screening structure, they simply mix the waste copper from the multi-stage screening and then feed it back into the screening box for multiple screenings, leading to the upper part of the waste copper being screened repeatedly. The screen plate bears a heavy load, causing repeated screening and reducing screening efficiency. Third, the material flowing back to the screen plate tends to accumulate in local areas and cannot be evenly diffused to the entire working surface of the screen plate, causing screen hole blockage and reduced screening efficiency. Moreover, the existing diffusion methods mostly rely on the material's own gravity, resulting in poor diffusion effect. Fourth, waste copper raw materials often contain large impurities or lumps. The existing crushing mechanism is mostly single-stage crushing, which is not precise enough. Large pieces of material are easily stuck in the screen holes after entering the screening box, further reducing screening efficiency.

[0004] In summary, existing multi-stage screening devices for waste copper suffer from drawbacks such as low screening efficiency, poor grading accuracy, high equipment failure rate, and high maintenance costs, making it difficult to meet the demands for large-scale, efficient, and refined processing of waste copper. Therefore, developing a multi-stage screening device for waste copper recycling with a reasonable structure, high screening efficiency, high grading accuracy, and stable operation has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-stage screening device for waste copper recycling, which solves the shortcomings of the prior art.

[0006] The objective of this invention is achieved through the following technical solution: a multi-stage screening device for waste copper recycling, comprising a multi-stage screening box, wherein multiple screening plates are spaced apart along their height within the multi-stage screening box, the mesh diameter of the multiple screening plates gradually decreasing from top to bottom, the screening plates being installed at an incline on the multi-stage screening box, and each screening plate in the multi-stage screening box having a discharge window, the bottom end of the screening plate extending into the discharge window, each screening plate being equipped with a recycling mechanism, the recycling mechanism comprising a conveying pipe, a discharge pipe, a screw conveyor, and a recycling pipe, the screw conveyor being installed at an incline, the high end of the conveying pipe being connected to the discharge window, the bottom end of the conveying pipe being connected to the low end inlet of the screw conveyor, one end of the recycling pipe being connected to the multi-stage screening box, the high end outlet of the screw conveyor being connected to the recycling pipe, the recycling pipe being used to re-transport the waste copper onto the corresponding screening plate, and the discharge pipe being installed vertically at the bottom of the conveying pipe.

[0007] Furthermore, it also includes a diffusion mechanism, which includes an industrial fan and branch pipes. The outlet of the industrial fan is connected to a main pipe, and each of the screening plates is equipped with a branch pipe. One end of the branch pipe is connected to the main pipe, and the other end is connected to the end of the recovery pipe away from the multi-stage screening box.

[0008] Furthermore, the side wall of the feeding pipe is inclinedly provided with a discharge pipe, the high end of which is connected to the feeding pipe. A lifting valve mechanism is provided inside the feeding pipe, the lifting valve mechanism including a lifting stop plate. A stepped feeding groove is opened on the side wall of the feeding pipe, the small groove of which is connected to the inner hole of the feeding pipe. The lifting stop plate has a stepped structure and has the freedom to move along the axial direction of the feeding pipe. The lifting stop plate is adapted to the stepped feeding groove.

[0009] Furthermore, the lifting valve mechanism also includes an electromagnet, a permanent magnet, and a guide shaft. The guide shaft is slidably fitted inside the feeding pipe. The electromagnet is installed below the guide shaft. A small-diameter shaft is fixed to the top of the guide shaft. The small-diameter shaft is fixedly connected to the lifting stop plate. The permanent magnet is installed at the bottom of the guide shaft. A spring is provided between the electromagnet and the permanent magnet. The lifting stop plate is fitted to the stepped feeding trough under the pressure of the spring. When the electromagnet is energized, it generates magnetic poles that are opposite to the magnetism of the permanent magnet.

[0010] Furthermore, the bottom end of the screening plate extends into the conveying pipe, and the upper end of the screening plate is rotatably mounted on the side wall of the multi-stage screening box via a hinge shaft. A vibration spring is connected to the inner bottom wall of the discharge window, and the vibration spring is connected to the bottom of the screening plate.

[0011] Furthermore, a vibrator is installed on the outer wall of the multi-stage screening box, and a corrugated pipe is sleeved on the vibration spring. The two ends of the corrugated pipe are respectively connected to the multi-stage screening box and the screening plate.

[0012] Furthermore, a crushing mechanism is provided on the top of the multi-stage screening box. The crushing mechanism includes a crushing box, the top of which is connected to a feed hopper. A crushing discharge port is opened at the bottom of the crushing box. A screening feed port is opened on the top of the multi-stage screening box and is connected to the crushing discharge port. A left crushing roller and a right crushing roller are rotatably arranged inside the feed hopper. A number of left annular cutters are equally spaced along the axial direction of the left crushing roller, and a number of right annular cutters are equally spaced along the axial direction of the right crushing roller. The right annular cutters and the left annular cutters are arranged alternately.

[0013] Furthermore, one end of the left crushing roller extends out of the crushing box and is connected to a first gear, and one end of the right crushing roller extends out of the crushing box and is connected to a second gear. The second gear meshes with the first gear. A crushing motor is installed on the top of the crushing box. The output shaft of the crushing motor is connected to a drive pulley. One end of the left crushing roller is connected to a driven pulley. The drive pulley is connected to the driven pulley via a synchronous belt drive.

[0014] Furthermore, the crushing chamber is equipped with a secondary crushing mechanism, which includes a blade plate and blades. The blades are arranged opposite to the blade plate. The end of the blade plate away from the blades is connected to a blade plate slide rod, and the end of the blades away from the blade plate is connected to a blade slide rod. Both the blade slide rod and the blade plate slide rod slide through the crushing chamber.

[0015] Furthermore, the blade slide bar is connected to a blade drive mechanism, which includes a drive ring and a drive motor. The end of the blade slide bar away from the blade is connected to the drive ring. A first rack and a second rack are arranged opposite to each other inside the drive ring. The drive motor is mounted on the outer wall of the crushing box. The output shaft of the drive motor is connected to an intermittent gear. The intermittent gear is located between the first rack and the second rack, and the intermittent gear alternately meshes with the first rack and the second rack.

[0016] The beneficial effects of this invention are: 1. Each screening plate is equipped with an independent recovery mechanism. Material that is not fully screened is directly returned to the original screening plate via a screw conveyor. The return path precisely corresponds to the original screening layer, avoiding cross-level mixing of materials with different particle sizes and ensuring the consistency of particle size of the screening products at each level. There is no need to centrally mix and re-feed the material, thus completely solving the problem of repeated screening.

[0017] 2. The diffusion mechanism introduces airflow into the recovery pipe through an industrial fan, causing the returned material to spread evenly across the entire working surface of the screening plate under the action of the airflow. Materials of different particle sizes diffuse at different positions under the action of the airflow, thereby effectively separating materials that are bound together and diffusing smaller particles to the high end of the screening plate, where they can be quickly screened down, achieving precise screening while improving screening efficiency.

[0018] 3. It adopts a combination structure of "roller primary crushing + reciprocating shear secondary crushing". The staggered ring blades of the left and right crushing rollers first crush large pieces of material. The secondary crushing mechanism achieves fine crushing through the reciprocating shearing of the blades and the blade plate. The particle size of the crushed material is more suitable for the screen hole size of the screening plate, which completely solves the problem of large impurities or agglomerated waste copper blocking the screen holes and ensures a smooth screening process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the internal structure of a multi-stage screening device for waste copper recycling according to the present invention; Figure 2 This is a schematic diagram of the internal structure of the multi-stage screening box in a multi-stage screening device for waste copper recycling according to the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view at point B in the middle; Figure 5 This is a schematic diagram of the crushing box in a multi-stage screening device for waste copper recycling according to the present invention; In the diagram, 1-multi-stage screening box, 2-screening plate, 3-discharge window, 4-conveying pipe, 5-discharge pipe, 6-screw elevator, 7-recovery pipe, 8-industrial fan, 9-branch pipe, 10-main pipe, 11-discharge pipe, 12-lifting blockage plate, 13-step discharge chute, 14-electromagnet, 15-permanent magnet, 16-guide shaft, 17-small diameter shaft, 18-spring, 19-vibration spring, 20-bellows, 21-crushing box, 22-feed hopper, 2 3- Crushing feed inlet, 24- Screening feed inlet, 25- Left crushing roller, 26- Right crushing roller, 27- Left ring cutter, 28- Right ring cutter, 29- First gear, 30- Second gear, 31- Crushing motor, 32- Driving pulley, 33- Driven pulley, 34- Synchronous belt, 35- Cutting plate, 36- Blade, 37- Cutting plate slide bar, 38- Blade slide bar, 39- Drive ring, 40- Drive motor, 41- First rack, 42- Second rack, 43- Intermittent gear. Detailed Implementation

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0021] Example 1 like Figures 1 to 5 As shown, a multi-stage screening device for waste copper recycling includes a multi-stage screening box 1. Multiple screening plates 2 are spaced apart along their height within the multi-stage screening box 1. The mesh diameter of the screening plates 2 gradually decreases from top to bottom. The screening plates 2 are installed at an angle on the multi-stage screening box 1. Each screening plate 2 in the multi-stage screening box 1 has a discharge window 3. The bottom end of each screening plate 2 extends into the discharge window 3. Each screening plate 2 is equipped with a recycling mechanism, which includes a conveying pipe 4, a discharge pipe 5, a screw conveyor 6, and a recycling pipe 7. The screw conveyor 6... The conveying pipe 4 is inclined, with its high end connected to the discharge window 3 and its low end connected to the low-end inlet of the screw conveyor 6. One end of the recovery pipe 7 is connected to the multi-stage screening box 1, and the high-end outlet of the screw conveyor 6 is connected to the recovery pipe 7. The recovery pipe 7 is used to re-transport the scrap copper to the corresponding screening plate 2. The discharge pipe 5 is vertically installed at the bottom of the conveying pipe 4, feeding the crushed scrap copper from the top of the multi-stage screening box 1 into the multi-stage screening box 1. The scrap copper is then screened step-by-step by multiple screening plates 2 to obtain scrap copper of different particle sizes. To facilitate the discharge of waste copper from each screening stage, the screening plate 2 is set to an inclined state, allowing the waste copper remaining on the screening plate 2 to be discharged from the discharge window 3 under its own gravity, thus collecting the waste copper from each screening stage. However, as the waste copper on the screening plate 2 moves downward, it carries the waste copper from the next stage with it out of the discharge window 3, resulting in the discharged waste copper material containing a large amount of waste copper of the next lower particle size, making accurate screening impossible. Therefore, each screening plate 2 is equipped with a recycling mechanism, and the material discharged through the screening plate 2 is sent to the screw conveyor 6 through the conveying pipe 4. Inside, the collected and discharged material is conveyed upward by the screw conveyor 6, and finally returned to the corresponding screening plate 2 through the recovery pipe 7, realizing the circulation screening of the discharged material. The scrap copper that is not fully screened is directly returned to the original screening plate 2 by the screw conveyor, so that the scrap copper of the next stage can be effectively screened without the need for centralized mixing and refeeding. This completely solves the problem of repeated screening and improves screening efficiency. After one stage of circulation screening, the discharge pipe 5 is opened so that the scrap copper obtained from each stage of screening is discharged through the corresponding discharge pipe 5, realizing precise screening and improving screening efficiency.

[0022] Example 2 Based on Example 1, such as Figures 1 to 5As shown, a crushing mechanism is provided on the top of the multi-stage screening box 1. The crushing mechanism includes a crushing box 21, a feed hopper 22 connected to the top of the crushing box 21, a crushing discharge port 23 opened at the bottom of the crushing box 21, a screening feed port 24 opened on the top of the multi-stage screening box 1, and the screening feed port 24 connected to the crushing discharge port 23. A left crushing roller 25 and a right crushing roller 26 are rotatably arranged inside the feed hopper 22. Several left annular cutters 27 are evenly spaced along their own axial direction on the left crushing roller 25, and several right annular cutters 28 are evenly spaced along their own axial direction on the right crushing roller 26. The right annular cutters 28 and left annular cutters 27 are staggered. One end of the left crushing roller 25 passes through the crushing box 21 and is connected to a first gear 29. One end of the right crushing roller 26 passes through the crushing box 21 and is connected to a second gear 30. The second gear 30 meshes with the first gear 29. A crushing device is installed on the top of the crushing box 21. The crushing motor 31 has an output shaft connected to a drive pulley 32. One end of the left crushing roller 25 is connected to a driven pulley 33. The drive pulley 32 is connected to the driven pulley 33 via a synchronous belt 34. When scrap copper is fed into the feed hopper 22, the crushing motor 31 drives the drive pulley 32 to rotate. The drive pulley 32 drives the driven pulley 33 to rotate via the synchronous belt 34, thereby causing the left crushing roller 25 to drive the left annular cutter 27 to rotate. The left crushing roller 25 drives the right crushing roller 26 to rotate through the meshing of the first gear 29 and the second gear 30. The right crushing roller 26 drives the right annular cutter 28 to rotate. The crushing operation of the scrap copper is completed through the cooperation of the left annular cutter 27 and the right annular cutter 28. The crushed scrap copper enters the multi-stage screening box 1, integrating crushing and screening together, eliminating the intermediate conveying time of crushed scrap copper and improving the processing efficiency of scrap copper.

[0023] Example 3 Because copper has good ductility, a double-roll crusher structure cannot easily and completely crush scrap copper, making it easy to cut into strips rather than granules, which affects subsequent screening operations. Therefore, based on Example 2, as... Figures 1 to 5As shown, a secondary crushing mechanism is provided inside the crushing box 21. The secondary crushing mechanism includes a cutter plate 35 and blades 36. Blades 36 are arranged opposite to the cutter plate 35. A cutter plate slide rod 37 is connected to the end of the cutter plate 35 away from the blades 36, and a blade slide rod 38 is connected to the end of the blades 36 away from the cutter plate 35. Both the blade slide rod 38 and the cutter plate slide rod 37 slide through the crushing box 21. The blade slide rod 38 is connected to a blade driving mechanism, which includes a drive ring 39 and a drive motor 40. The end of the blade slide rod 38 away from the blades 36 is connected to the drive ring 39. A first rack 41 and a second rack 42 are arranged opposite to each other inside the drive ring 39. The drive motor 40 is mounted on the outer wall of the crushing box 21. An intermittent gear 43 is connected to the output shaft of the drive motor 40. The intermittent gear 43 is located between the first rack 41 and the second rack 42. The intermittent gear 43 alternately meshes with the first rack 41 and the second rack 42. The blades 36 are in contact with the inner top wall of the crushing box 21. The primary crushed scrap copper undergoes secondary crushing immediately upon entering the crushing chamber 21. The drive motor 40 rotates the intermittent gear 43, which first engages with the first rack 41. This causes the first rack 41 to move the drive ring 39 away from the crushing chamber 21. The drive ring 39, through the blade slide rod 38, moves the blade 36 away from the blade plate 35. The blade plate 35 moves away from the blade 36 via the same drive mechanism, allowing the scrap copper to enter between the blade 36 and the blade plate 35. When the intermittent gear 43 engages with the second rack 42, the drive ring 39, through the blade slide rod 38, moves the blade 36 closer to the blade plate 35. Simultaneously, the blade plate 35 moves closer to the blade 36. The contact between the blade 36 and the blade plate 35 completes the cutting operation of the scrap copper. The alternating engagement of the intermittent gear 43 causes the drive ring 39 to reciprocate, which in turn causes the blade plate 35 and the blade 36 to reciprocate, achieving continuous cutting of the scrap copper and preventing long strips of scrap copper from affecting the screening effect.

[0024] Example 4 Based on Embodiment 3, a diffusion mechanism is also included. The diffusion mechanism includes an industrial fan 8 and branch pipes 9. The outlet of the industrial fan 8 is connected to the main pipe 10. Each screening plate 2 is equipped with a branch pipe 9. One end of the branch pipe 9 is connected to the main pipe 10, and the other end is connected to the end of the recovery pipe 7 away from the multi-stage screening box 1. The waste copper entering the circulation is transported to the recovery pipe 7 by the screw conveyor 6. The industrial fan 8 provides air power, and the air is blown into the corresponding recovery pipe 7 through the branch pipe 9, so that the return material is evenly spread on the entire working surface of the screening plate 2 under the action of airflow. The materials of different particle sizes diffuse at different positions under the action of airflow, thereby effectively separating the materials that are combined together and diffusing the materials with smaller particle sizes to the high end of the screening plate, so that they can be quickly screened down by the screening plate, achieving precise screening while improving screening efficiency.

[0025] Example 5 Based on Example 4, such as Figures 1 to 4 As shown, a discharge pipe 11 is inclinedly arranged on the side wall of the discharge pipe 5. The high end of the discharge pipe 11 is connected to the discharge pipe 5. A lifting valve mechanism is installed inside the discharge pipe 5. The lifting valve mechanism includes a lifting stop plate 12. A stepped discharge groove 13 is opened on the side wall of the discharge pipe 5. The small groove of the stepped discharge groove 13 is connected to the inner hole of the discharge pipe 5. The lifting stop plate 12 has a stepped structure and has the freedom to move along the axial direction of the discharge pipe 5. The lifting stop plate 12 is adapted to the stepped discharge groove. 13. The lifting valve mechanism also includes an electromagnet 14, a permanent magnet 15, and a guide shaft 16. The guide shaft 16 is slidably fitted inside the discharge pipe 5. The electromagnet 14 is installed below the guide shaft 16. A small-diameter shaft 17 is fixed to the top of the guide shaft 16, and the small-diameter shaft 17 is fixedly connected to the lifting block plate 12. The permanent magnet 15 is installed at the bottom of the guide shaft 16. A spring 18 is provided between the electromagnet 14 and the permanent magnet 15. Under the pressure of the spring 18, the lifting block plate 12 is fitted into the stepped discharge chute. 13. When the electromagnet 14 is energized, it generates magnetic poles opposite to those of the permanent magnet 15. During the waste copper recycling screening process, the lifting block plate 12 is fitted into the stepped feed chute 13. At this time, the top surface of the lifting block plate 12 is flush with the inner bottom surface of the conveying pipe 4, allowing the waste copper to smoothly enter the screw conveyor 6. The spring 18 is in a compressed state, and under the force of the spring 18, the lifting block plate 12 is stably fitted into the stepped feed chute 13. When the recycling screening is completed, the electromagnet 14 is energized to attract the permanent magnet 15. The guide slide 16 compresses the spring 18 and moves it downward, thereby driving the lifting block plate 12 to move downward, connecting the conveying pipe 4 with the discharge pipe 5. A positioning block is fixed on the inner wall of the discharge pipe 5. When the guide slide 16 contacts the positioning block, the top surface of the lifting block plate 12 is flush with the inner bottom wall of the discharge pipe 11, so that the screened material falls onto the lifting block plate 12 through the conveying pipe 4. Then, guided by the lifting block plate 12, the material is discharged from the discharge pipe 11, realizing precise screening and graded discharge.

[0026] Example 6 Based on Example 5, such as Figures 1 to 4As shown, the bottom end of the screening plate 2 extends into the conveying pipe 4, and the top end of the screening plate 2 is rotatably mounted on the side wall of the multi-stage screening box 1 via a hinge shaft. A vibration spring 19 is connected to the inner bottom wall of the discharge window 3. The vibration spring 19 is connected to the bottom of the screening plate 2. A vibrator is installed on the outer side wall of the multi-stage screening box 1. A corrugated pipe 20 is sleeved on the vibration spring 19. The two ends of the corrugated pipe 20 are respectively connected to the multi-stage screening box 1 and the screening plate 2. The vibrator causes the multi-stage screening box 1 to vibrate. The vibration generated by the multi-stage screening box 1 causes the screening plate 2 to reciprocate along the hinge position to generate vibration. On the one hand, it separates the waste copper that is adsorbed together, and on the other hand, it strengthens the movement of the waste copper so that the waste copper can pass smoothly through the screening plate 2 into the conveying pipe 4. The corrugated pipe 20 is set to protect the vibration spring 19, avoid the vibration spring 19 from being affected by the waste copper, and extend the service life of the vibration spring 19.

Claims

1. A multi-stage screening device for scrap copper recovery, characterized by, The application relates to a multi-stage screening box (1) which is provided with a plurality of screening plates (2) in the height direction of the multi-stage screening box (1) at intervals, the mesh diameters of the plurality of screening plates (2) gradually decrease from top to bottom, the screening plates (2) are obliquely arranged on the multi-stage screening box (1), the multi-stage screening box (1) is provided with a discharging window (3) corresponding to each screening plate (2), the bottom end of the screening plate (2) extends into the discharging window (3), each screening plate (2) is provided with a recycling mechanism, the recycling mechanism comprises a conveying pipeline (4), a discharging pipeline (5), a screw elevator (6) and a recycling pipeline (7), the screw elevator (6) is obliquely arranged, the high end of the conveying pipeline (4) is connected with the discharging window (3), the bottom end of the conveying pipeline (4) is connected with the low end feeding port of the screw elevator (6), one end of the recycling pipeline (7) is communicated with the multi-stage screening box (1), the high end discharging port of the screw elevator (6) is communicated with the recycling pipeline (7), the recycling pipeline (7) is used for conveying the waste copper to the corresponding screening plate (2) again, and the discharging pipeline (5) is vertically arranged at the bottom of the conveying pipeline (4).

2. A multi-stage screening device for scrap copper recovery as claimed in claim 1 wherein, The application further comprises a diffusion mechanism, the diffusion mechanism comprises an industrial fan (8) and a branch pipeline (9), the outlet of the industrial fan (8) is connected with a main pipeline (10), each screening plate (2) is provided with a branch pipeline (9), one end of the branch pipeline (9) is connected with the main pipeline (10), and the other end of the branch pipeline (9) is connected with the end of the recycling pipeline (7) which is far away from the multi-stage screening box (1).

3. A multi-stage screening device for scrap copper recovery as claimed in claim 1 wherein, The side wall of the discharging pipeline (5) is obliquely provided with a discharging pipeline (11), the high end of the discharging pipeline (11) is communicated with the discharging pipeline (5), the discharging pipeline (5) is provided with a lifting valve mechanism, the lifting valve mechanism comprises a lifting blocking plate (12), the side wall of the discharging pipeline (5) is provided with a stepped discharging groove (13), the small-size groove of the stepped discharging groove (13) is communicated with the inner hole of the discharging pipeline (5), the lifting blocking plate (12) is of a stepped structure, the lifting blocking plate (12) has the freedom of moving along the axial direction of the discharging pipeline (5), and the lifting blocking plate (12) is adapted to the stepped discharging groove (13).

4. A multi-stage screening apparatus for scrap copper recovery as claimed in claim 3 wherein, The lifting valve mechanism further comprises an electromagnet (14), a permanent magnet (15) and a guide sliding shaft (16), the guide sliding shaft (16) is slidingly adapted in the discharging pipeline (5), the electromagnet (14) is arranged below the guide sliding shaft (16), the top of the guide sliding shaft (16) is fixed with a small-diameter shaft (17), the small-diameter shaft (17) is fixedly connected with the lifting blocking plate (12), the permanent magnet (15) is arranged at the bottom of the guide sliding shaft (16), a spring (18) is arranged between the electromagnet (14) and the permanent magnet (15), the lifting blocking plate (12) is adapted to the stepped discharging groove (13) under the pressure of the spring (18), and the electromagnet (14) generates a magnetic pole which is different from the magnetic pole of the permanent magnet (15) when the electromagnet (14) is electrified.

5. A multi-stage screening device for scrap copper recovery as claimed in claim 1, wherein, The bottom end of the screening plate (2) extends into the conveying pipe (4), the high end of the screening plate (2) is rotatably installed on the side wall of the multi-stage screening box (1) through a hinged shaft, the inner bottom wall of the discharging window (3) is connected with a vibrating spring (19), and the vibrating spring (19) is connected to the bottom of the screening plate (2).

6. A multi-stage screening apparatus for scrap copper recovery according to claim 5, wherein, A vibration exciter is installed on the outer side wall of the multi-stage screening box (1), a bellows (20) is sleeved on the vibrating spring (19), and the two ends of the bellows (20) are connected with the multi-stage screening box (1) and the screening plate (2) respectively.

7. A multi-stage screening device for scrap copper recovery as claimed in claim 1 wherein, A crushing mechanism is arranged at the top of the multi-stage screening box (1), the crushing mechanism comprises a crushing box (21), a feeding hopper (22) is communicatively arranged at the top of the crushing box (21), a crushing discharging port (23) is formed in the bottom of the crushing box (21), a screening feeding port (24) is formed in the top of the multi-stage screening box (1), the screening feeding port (24) is communicated with the crushing discharging port (23), left and right crushing rollers (25, 26) are rotatably arranged in the feeding hopper (22), a plurality of left annular knives (27) are sleeved on the left crushing roller (25) along the axial direction of the left crushing roller (25) at equal intervals, a plurality of right annular knives (28) are sleeved on the right crushing roller (26) along the axial direction of the right crushing roller (26) at equal intervals, and the right annular knives (28) and the left annular knives (27) are arranged in a staggered manner.

8. A multi-stage screening apparatus for scrap copper recovery according to claim 7, wherein, One end of the left crushing roller (25) penetrates through the crushing box (21) and is connected with a first gear (29), one end of the right crushing roller (26) penetrates through the crushing box (21) and is connected with a second gear (30), the second gear (30) is engaged with the first gear (29), a crushing motor (31) is installed at the top of the crushing box (21), a driving pulley (32) is connected to the output shaft of the crushing motor (31), one end of the left crushing roller (25) is connected with a driven pulley (33), and the driving pulley (32) is drivingly connected with the driven pulley (33) through a synchronous belt (34).

9. A multi-stage screening apparatus for scrap copper recovery as claimed in claim 7, wherein, A two-stage crushing mechanism is arranged in the crushing box (21), the two-stage crushing mechanism comprises a knife plate (35) and a blade (36), the blade (36) is arranged opposite to the knife plate (35), one end of the knife plate (35) away from the blade (36) is connected with a knife plate sliding rod (37), one end of the blade (36) away from the knife plate (35) is connected with a blade sliding rod (38), and the blade sliding rod (38) and the knife plate sliding rod (37) both slide through the crushing box (21).

10. A multi-stage screening apparatus for scrap copper recovery according to claim 9, wherein, The blade slide rod (38) is connected with a blade driving mechanism, the blade driving mechanism comprises a driving ring (39) and a driving motor (40), one end of the blade slide rod (38) away from the blade (36) is connected with the driving ring (39), the driving ring (39) is relatively provided with a first rack (41) and a second rack (42) in the driving ring (39), the driving motor (40) is installed on the outer side wall of the crushing box (21), the output shaft of the driving motor (40) is connected with an intermittent gear (43), the intermittent gear (43) is located between the first rack (41) and the second rack (42), and the intermittent gear (43) is alternatively engaged with the first rack (41) and the second rack (42).

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