Construction waste recycling material air separation system

Abstract

The application relates to the field of construction waste treatment, in particular to a construction waste regeneration material air separation system, which comprises a rack and a screening assembly arranged on the rack, the screening assembly comprises a screening cylinder rotating on the rack, a plurality of first screening holes are arranged on the screening cylinder, a feeding hopper for being in communication with the screening cylinder is arranged on the rack, the feeding hopper is rotationally connected to the screening cylinder, a driving assembly for driving the screening cylinder to rotate is arranged on the rack, when material enters the screening cylinder through the feeding hopper, the driving assembly drives the screening cylinder to rotate, and part of the material is discharged from the first screening holes. The application has the advantages of improving the screening efficiency of the construction waste regeneration material.

Description

Technical Field

[0001] This application relates to the technical field of construction waste treatment, and in particular to an air separation system for recycled construction waste materials. Background Technology

[0002] With the development of modern cities, the demolition and renovation of old and dilapidated houses are becoming increasingly common. This process generates a large amount of construction waste, including concrete blocks, steel bars, bricks, and tiles. To conserve resources, construction waste is typically recycled to achieve sustainable development. Before processing, construction waste must first be sorted and then crushed using a crusher to obtain aggregates and sand suitable for producing concrete or non-fired bricks.

[0003] After the construction waste has been crushed, it still needs to be further subdivided by a vibrating screen. For example, a construction waste crushing and air separation system disclosed in the prior art includes a frame and a conveyor belt set on the frame. The conveyor belt has a discharge hole and a receiving box is set inside the conveyor belt. When the conveyor belt moves, the material enters the receiving box through the discharge hole by its own gravity, thereby realizing the screening of the material.

[0004] In the aforementioned technologies, the material can be screened by setting the material drop holes on the conveyor belt. However, relying solely on gravity during the screening process will result in insufficient screening of the material and slow screening efficiency. Summary of the Invention

[0005] To improve the screening efficiency of recycled construction waste, this application provides an air separation system for recycled construction waste.

[0006] The air separation system for recycled construction waste provided in this application adopts the following technical solution:

[0007] A construction waste recycling system includes a frame and a screening assembly mounted on the frame. The screening assembly includes a screening cylinder that rotates on the frame, with a plurality of first screening holes. A feed hopper that communicates with the inside of the screening cylinder is mounted on the frame and is rotatably connected to the screening cylinder. A drive assembly that drives the screening cylinder to rotate is mounted on the frame. When material enters the screening cylinder through the feed hopper, the drive assembly drives the screening cylinder to rotate, causing the material to be discharged from the first screening holes.

[0008] By adopting the technical scheme, when the construction waste is screened, the crushed material is directly fed into the screening cylinder through the feeding hopper, then the driving assembly drives the screening cylinder to rotate, and the material meeting the requirements in the screening cylinder flows out through the first screening hole, and when the material is screened, the rotation of the screening cylinder can make the material be more fully screened and the screening efficiency be faster.

[0009] Optionally, the collecting box is installed on the frame, the feeding hopper is fixedly installed on the collecting box, and the screening cylinder is rotatably connected in the collecting box.

[0010] By adopting the technical scheme, under the action of the collecting box, when the screening cylinder rotates, the material can be directly fed into the collecting box, on the one hand, the material can be conveniently collected, and on the other hand, the appearance of dust during screening is reduced, and the environmental protection purpose is achieved.

[0011] Optionally, the first discharging port is formed in the bottom of the collecting box body, the collecting box is provided with a blocking plate for blocking the first discharging port, and the blocking plate is slidably connected to the collecting box.

[0012] By adopting the technical scheme, when the screening is completed, the blocking plate is directly pushed to open the first discharging port, and then the material in the collecting box is cleaned.

[0013] Optionally, the rotating shaft is fixedly installed on the screening cylinder, the rotating shaft is rotatably connected to the collecting box, the driving assembly comprises a first gear provided on the rotating shaft, a second gear rotatably connected to the collecting box, and a driving motor provided on the collecting box, the output shaft of the driving motor is connected with the second gear and drives the second gear to rotate, the first gear and the second gear are engaged, and the first gear slides along the length direction of the rotating shaft.

[0014] By adopting the technical scheme, when the screening cylinder is driven to rotate, the driving motor drives the first gear to rotate, then the first driving gear drives the second gear to rotate, and the second gear drives the rotating shaft and the screening cylinder to rotate.

[0015] Optionally, the thickness of the first gear is smaller than that of the second gear, and the first gear slides along the length direction of the rotating shaft.

[0016] By adopting the technical scheme, since the thickness of the first gear is smaller than that of the second gear, the engagement is more stable.

[0017] Optionally, the second discharging port is formed in the end face of the screening cylinder, the second blocking plate for blocking the second discharging port is formed in the screening cylinder, and the second blocking plate is slidably connected to the rotating shaft.

[0018] By adopting the technical scheme, when the material screening is completed, the second blocking plate is slid to open the second discharge port, and the material in the screening cylinder is conveniently cleaned.

[0019] Optionally, the cleaning assembly for cleaning the material in the screening cylinder is arranged in the screening cylinder, the cleaning assembly comprises a cleaning plate sliding along the axial direction of the screening cylinder and a driving screw rotatably connected to the screening cylinder, and the driving screw is arranged on the rotating shaft and rotatably connected to the rotating shaft.

[0020] The rack is provided with a pushing member for pushing the first gear to move from the rotating shaft to the driving screw or pushing the first gear to move from the driving screw to the rotating shaft.

[0021] When the pushing member pushes the first gear to move to the driving screw, the rotating shaft is fixed to the rack.

[0022] By adopting the technical scheme, when the material in the screening cylinder needs to be cleaned, the pushing member directly drives the first gear to move from the rotating shaft to the driving screw, the rotating shaft is fixed to the rack under the action of the pushing member, then the second gear drives the first gear to rotate, the first gear drives the driving screw to rotate, thereby driving the cleaning plate to move along the axial direction of the screening barrel, at this time, the cleaning plate pushes the material to move in the direction close to the second discharge port, and finally the material is discharged from the second discharge port.

[0023] Optionally, the pushing member comprises a moving plate slidably connected to the rotating shaft and a pushing rod fixedly installed on the moving plate, the rack is provided with a fixing groove for inserting the pushing rod, and the moving plate abuts against the first gear, when the first gear is completely separated from the rotating shaft, the pushing rod is completely located in the fixing groove, and at this time, the rotating shaft is fixed to the rack.

[0024] By adopting the technical scheme, when the first gear needs to drive the driving screw to rotate, the moving plate directly drives the first gear to move, and the moving plate drives the pushing rod to move at the same time, so that the pushing rod is completely moved into the fixing groove, at this time, the first gear is located on the driving screw, and thus it is more convenient to adjust the position of the first gear.

[0025] Optionally, an adjusting ring for adjusting the size of the first screening hole is slidably connected to the inner wall of the screening barrel, the adjusting ring is provided with a second screening hole, the second screening hole corresponds to the first screening hole, and the area of the overlapping region of the first screening hole and the second screening hole is adjusted by sliding the adjusting ring, and the larger the area of the overlapping region is, the larger the screened material particles are.

[0026] By adopting the technical scheme, the overlapping area of the first screening hole and the second screening hole is adjusted according to requirements, the overlapping area of the first screening hole and the second screening hole is smallest at the beginning of screening, then the qualified material enters into the collecting box, and finally is discharged from the first discharge port, and finally the size of the overlapping area of the first screening hole and the second screening hole is gradually adjusted, and the material is screened step by step, so that the traditional multiple screening net mode can be replaced during use, and production cost is saved.

[0027] Optionally, the adjusting ring is provided with an adjusting screw for adjusting the position of the adjusting ring, the adjusting screw is arranged on the adjusting ring and is in threaded connection with the adjusting ring, and the adjusting screw drives the adjusting ring to move along the axis direction of the screening drum when the adjusting screw is rotated.

[0028] By adopting the technical scheme, when the position of the adjusting ring needs to be adjusted, the adjusting screw is directly rotated, the adjusting screw drives the adjusting ring to move along the axis direction of the screening drum, and then it is more convenient to adjust the size of the overlapping area of the first screening hole and the second screening hole. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a whole structure schematic view of the embodiment of the application.

[0030] Figure 2 is a collecting box sectional view of the embodiment of the application.

[0031] Figure 3 is a cleaning assembly structure schematic view of the embodiment of the application.

[0032] Figure 4 is a screening drum sectional view of the embodiment of the application.

[0033] Figure 5 is Figure 2 is an enlarged view of A in FIG. 8.

[0034] Figure 6 is Figure 4 is an enlarged view of B in FIG. 8.

[0035] Reference numerals: 1. Frame; 11. Collection box; 12. Feed hopper; 13. First discharge port; 14. Sealing plate; 15. Guide plate; 16. First screening hole; 17. Rotating shaft; 2. Screening assembly; 21. Screening cylinder; 3. Drive assembly; 31. First gear; 32. Second gear; 33. Drive motor; 4. Adjusting ring; 41. Second screening hole; 42. Adjusting screw; 43. Mounting plate; 5. Second discharge port; 51. Second sealing plate; 52. Sliding bar; 53. Moving groove; 54. Limiting ring; 55. Fixing groove; 6. Cleaning assembly; 61. Cleaning plate; 62. Drive screw; 7. Pushing component; 71. Moving plate; 72. Push rod; 8. Return spring; 9. Blowing assembly; 91. Fan; 92. Air duct; 93. Connecting ring. Detailed Implementation

[0036] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0037] This application discloses an air separation system for recycled construction waste. (Refer to...) Figure 1 and Figure 2 A construction waste recycling system includes a frame 1 and a collection box 11 fixedly installed on the frame 1. The collection box 11 is horizontally arranged and a screening component 2 is installed inside the collection box 11. A feed hopper 12 is also installed on the collection box 11. The feed hopper 12 is used to feed the screening component 2. The crushed material enters the screening component 2 through the feed hopper 12 and is then screened step by step by the screening component 2. The screened material enters the collection box 11.

[0038] Reference Figure 1 and Figure 2 A first discharge port 13 is provided on the bottom wall of the collection box 11. A sealing plate 14 is slidably connected to the collection box 11 to block the first discharge port 13. The sealing plate 14 slides along the length of the collection box 11. A drive cylinder and a corresponding controller are provided on the collection box 11. When material needs to be discharged from the collection box 11, the controller directly moves the drive cylinder, which in turn moves the sealing plate 14, opening the first discharge port 13 and cleaning the material inside. After cleaning, the controller moves the drive cylinder to move the sealing plate 14 in the opposite direction to continue blocking the first discharge port 13. To facilitate the discharge of material from the collection box 11, guide plates 15 are fixedly installed on the bottom wall of the collection box 11. The guide plates 15 are inclined. In this embodiment, two guide plates 15 are provided, symmetrically arranged on opposite sides of the first discharge port 13, so that the first discharge port 13 has an inverted conical cross-section in the vertical direction.

[0039] Reference Figure 2 andFigure 3 The screening assembly 2 comprises a screening cylinder 21, the axis of the screening cylinder 21 is horizontally arranged, and a plurality of first screening holes 16 are arranged on the screening cylinder 21, the plurality of first screening holes 16 are uniformly distributed on the screening cylinder 21, a rotating shaft 17 is coaxially fixedly arranged on the screening cylinder 21, the rotating shaft 17 extends out of the collecting box 11 and is rotatably connected to the collecting box 11, and a driving assembly 3 for driving the rotating shaft 17 to rotate is arranged on the frame 1, the material entering the screening cylinder 21 through the feeding hopper 12 drives the screening cylinder 21 to rotate under the action of the driving assembly 3, and then the qualified material enters the collecting box 11 through the first screening hole 16, and finally is discharged through the first discharge port 13.

[0040] With reference to Figure 2 and Figure 3 A plurality of second screening holes 41 are arranged on the adjusting ring 4, the plurality of second screening holes 41 correspond to the plurality of first screening holes 16; when the material is screened, the material is discharged from the overlapping area of the first screening hole 16 and the second screening hole 41, and by adjusting the position of the adjusting ring 4, the area of the overlapping area between the first screening hole 16 and the second screening hole 41 can be adjusted, and the larger the area of the overlapping area between the first screening hole 16 and the second screening hole 41, the larger the screened material. By adjusting the area of the overlapping area between the first screening hole 16 and the second screening hole 41, the material in the screening cylinder 21 can be gradually screened, and different sizes of materials can be screened without using a plurality of different sizes of filter screens. In the embodiment, before the position of the adjusting ring 4 is adjusted, the material in the collecting box 11 needs to be discharged, so as to avoid that different sizes of materials are mixed together in the collecting box 11, and an observation window 10 is arranged on the collecting box 11, so that the area of the overlapping area between the first screening hole 16 and the second screening hole 41 can be observed through the observation window 10.

[0041] With reference to Figure 2 and Figure 3On the collecting box 11, the adjusting screw 42 is rotationally connected, the axis of the adjusting screw 42 is parallel and spaced apart from the axis of the screening drum 21, one end of the adjusting screw 42 extends out of the collecting box 11, the other end is in the collecting box 11, a mounting plate 43 is provided on the adjusting screw 42, a guide rod is provided on the mounting plate 43 and fixedly installed on the collecting box 11, so that the mounting plate 43 slides along the axis direction of the screening drum 21, the mounting plate 43 is threadedly connected with the adjusting screw 42, the mounting plate 43 is rotationally connected to the inner wall of the adjusting ring 4, when the adjusting ring 4 is rotated by the screening drum 21, the adjusting ring 4 rotates on the mounting plate 43, when the position of the adjusting ring 4 needs to be adjusted, the adjusting screw 42 is directly rotated, the adjusting screw 42 drives the mounting plate 43 to move, the mounting plate 43 drives the adjusting ring 4 to move, thereby achieving the adjustment of the position of the adjusting ring 4.

[0042] With reference to Figure 3 And Figure 4 A second discharge port 5 is formed on the end face of the screening drum 21, a plurality of second discharge ports 5 are provided, the plurality of second discharge ports 5 are uniformly and spaced apart along the circumferential direction of the screening drum 21, and a second blocking plate 51 is slidably connected to the rotating shaft 17, the second blocking plate 51 is used to simultaneously block the plurality of second discharge ports 5, the second blocking plate 51 slides along the axis direction of the rotating shaft 17, when the material in the screening drum 21 needs to be cleaned, the second blocking plate 51 is directly slid to move the second blocking plate 51 away from the feeding hopper 12, at this time, the second discharge port 5 is opened, so that the material in the screening drum 21 which cannot be discharged from the area overlapping between the first screening hole 16 and the second screening hole 41 can be discharged from the second discharge port 5, the material discharged through the second discharge port 5 falls into the collecting box 11, and finally discharged through the first discharge port 13.

[0043] With reference to Figure 2 And Figure 4The driving assembly 3 on the rack 1 comprises a first gear 31 and a second gear 32, the thickness of the first gear 31 is smaller than that of the second gear 32, the first gear 31 is arranged on the rotating shaft 17 and is outside the collecting box 11, in the embodiment, a plurality of sliding bars 52 are welded on the first gear 31, the plurality of sliding bars 52 are uniformly and spacedly arranged along the circumference of the rotating shaft 17, meanwhile, a plurality of moving grooves 53 are formed on the rotating shaft 17, the plurality of moving grooves 53 and the plurality of sliding bars 52 are in one-to-one correspondence, and the moving grooves 53 are formed along the length direction of the rotating shaft 17, so that the first gear 31 can slide along the length direction of the rotating shaft 17 but cannot rotate on the rotating shaft 17, thereby the rotation of the first gear 31 can still drive the rotating shaft 17 to rotate; the second gear 32 is rotatably connected to the collecting box 11, the second gear 32 is engaged with the first gear 31, a driving motor 33 is fixedly arranged on the rack 1, the output shaft of the driving motor 33 is coaxially fixed with the second gear 32, the driving motor 33 drives the second gear 32 to rotate, then the second gear 32 drives the first gear 31 to rotate, the rotating shaft 17 and the screening drum 21 are driven to rotate by the first gear 31, thereby the purpose of driving the screening drum 21 to rotate is achieved.

[0044] In addition, with reference to Figure 3 and Figure 5 , the cleaning assembly 6 is arranged in the screening drum 21 and is used for pushing the materials to be discharged from the second discharge port 5; the cleaning assembly 6 comprises a cleaning plate 61 and a driving screw 62 rotatably connected in the screening drum 21, the cleaning plate 61 abuts against the inner wall of the screening drum 21 and slides along the axis direction of the screening drum 21, when the screening drum 21 rotates, the cleaning plate 61 and the screening drum 21 rotate simultaneously, the driving screw 62 is arranged on the cleaning plate 61 and is threadedly connected with the cleaning plate 61, the driving screw 62 is arranged on the rotating shaft 17 and is rotatably connected with the rotating shaft 17, one end of the driving screw 62 extends out of the rotating shaft 17.

[0045] With reference to Figures 3 to 6 , the one end of the driving screw 62 extending out of the rotating shaft 17 is welded with a limiting ring 54, the diameter of the limiting ring 54 is same as that of the rotating shaft 17, a plurality of moving grooves 53 for accommodating the sliding bars 52 are formed on the limiting ring 54, meanwhile, the pushing member 7 is arranged on the rotating shaft 17, the first gear 31 is driven to move by the pushing member 7, in the embodiment, the pushing member 7 comprises a moving plate 71 and a plurality of pushing rods 72 fixed on the moving plate 71, the moving plate 71 is slidably connected to the rotating shaft 17 along the length direction of the rotating shaft 17, and the plurality of pushing rods 72 are uniformly and spacedly arranged in the direction away from the rotating shaft 17; a fixing groove 55 for inserting the pushing rods 72 is formed on the rack 1, the end surface of the moving plate 71 is used for abutting against the first gear 31, the pushing rods 72 and the first gear 31 are driven to move along the length direction of the rotating shaft 17 by the moving plate 71.

[0046] With reference to Figures 3 to 6 When the sliding bar 52 on the first gear 31 is completely moved into the moving slot 53 on the limiting ring 54, at this time the push rod 72 is moved into the fixed slot 55, the rotating shaft 17 and the screening drum 21 are fixed on the rack 1, since the thickness of the second gear 32 is greater than the thickness of the first gear 31, the first gear 31 can still engage with the second gear 32, and at this time the first gear 31 can drive the driving screw 62 to rotate, through the rotation of the driving screw 62, the cleaning plate 61 is driven to move along the axis direction of the screening drum 21, when the cleaning plate 61 pushes the material to move, the material pushes the second blocking plate 51 to move, at this time the second discharge port 5 is opened, and the material is discharged from the screening drum 21.

[0047] With reference to Figures 3 to 6 In the embodiment, the driving motor 33 is set as a servo motor, the servo motor can drive the second gear 32 to rotate forward and reversely, when the material in the screening drum 21 is cleaned, the servo motor is reversed, so that the driving screw 62 drives the cleaning plate 61 to move reversely; in order to facilitate the second blocking plate 51 to move reversely at the same time with the cleaning plate 61, the reset spring 8 is sleeved on the rotating shaft 17, one end of the reset spring 8 abuts against the second blocking plate 51, and the other end abuts against the inner wall of the collecting box 11, when the cleaning plate 61 moves forward, the second discharge port 5 is opened, at this time the reset spring 8 is in a compressed state.

[0048] In addition, with reference to Figure 3 and Figure 5 In order to facilitate the screening of fine dust in the screening drum 21, the blowing assembly 9 is installed on the collecting box 11, the blowing assembly 9 includes the fan 91, the air pipe 92 and the connecting ring 93, the fan 91 is installed on the collecting box 11, the connecting ring 93 is fixedly installed on the inner wall of the collecting box 11 body, and the connecting ring 93 is rotatably connected to the screening drum 21, the connecting ring 93 is set as a hollow structure, the connecting ring 93 and the inside of the screening drum 21 are communicated, one end of the air pipe 92 is fixed at the air outlet of the fan 91, and the other end is fixedly installed on the connecting ring 93, the wind generated by the fan 91 blows to the screening drum 21 through the air pipe 92 and the connecting ring 93, at this time the screening drum 21 is rotated to accelerate the separation of fine dust.

[0049] The implementation principle of the construction waste recycling material air separation system in the embodiment of the application is as follows: first, the area of the overlapping region between the first screening hole 16 and the second screening hole 41 is adjusted according to the requirement, then the first gear 31 is arranged on the rotating shaft 17, the crushed material enters into the screening cylinder 21 through the feeding hopper 12, then the driving motor 33 drives the second gear 32 to rotate, the second gear 32 drives the first gear 31 to rotate, the rotating shaft 17 and the screening cylinder 21 are driven to rotate by the first gear 31, when the screening cylinder 21 rotates, the material is discharged from the overlapping region between the first screening hole 16 and the second screening hole 41 into the collecting box 11, after the screening of the material of the same size is completed, the first discharge port 13 is opened, the material is discharged from the first discharge port 13, then the material can be screened step by step by adjusting the area of the overlapping region between the first screening hole 16 and the second screening hole 41, and the screening is more convenient, and the screening efficiency of the construction waste material is improved.

[0050] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so: equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A construction and demolition waste recycling material air separation system, characterized in that: The utility model provides a screening device, including frame and set up on the frame screening assembly, screening assembly includes the screening cylinder that rotates on the frame, is seted up with a plurality of first screening hole on the screening cylinder, is provided with the feeding hopper for and the screening cylinder intercommunication on the frame, and the feeding hopper rotation is connected on the screening cylinder, is provided with the drive assembly for driving the screening cylinder rotation on the frame, when material enters the screening cylinder through the feeding hopper, drive assembly brings the screening cylinder rotation, and part material is discharged from the first screening hole; The collecting box is fixedly installed on the frame, and the feeding hopper is fixedly installed on the collecting box and the screening cylinder is rotationally connected in the collecting box; The bottom of the collecting box is provided with a first discharge port, and the collecting box is provided with a blocking plate for blocking the first discharge port, and the blocking plate is slidably connected to the collecting box; The screening cylinder is fixedly installed with a rotating shaft, and the rotating shaft is rotationally connected to the collecting box, and the drive assembly comprises a first gear provided on the rotating shaft, a second gear rotationally connected to the collecting box, and a drive motor provided on the collecting box, the output shaft of the drive motor is connected with the second gear and drives the second gear to rotate, and the first gear and the second gear are engaged; The thickness of the first gear is less than the thickness of the second gear, and the first gear slides along the length direction of the rotating shaft; The end surface of the screening cylinder is provided with a second discharge port, and the screening cylinder is provided with a second blocking plate for blocking the second discharge port, and the second blocking plate is slidably connected to the rotating shaft; The screening cylinder is provided with a cleaning assembly for cleaning the material in the screening cylinder, the cleaning assembly comprises a cleaning plate sliding along the axial direction of the screening cylinder and a drive screw rotationally connected to the screening cylinder, the drive screw is provided through the rotating shaft and is rotationally connected to the rotating shaft, and the drive screw and the cleaning plate are threadedly connected; The frame is provided with a pushing member for pushing the first gear to move from the rotating shaft to the drive screw or pushing the first gear to move from the drive screw to the rotating shaft; When the pushing member pushes the first gear to move to the drive screw, the rotating shaft is fixed to the frame; A plurality of sliding bars are welded on the first gear, the plurality of sliding bars are uniformly and spacedly arranged in the circumferential direction of the rotating shaft, a plurality of moving grooves are formed on the rotating shaft, the plurality of moving grooves and the plurality of sliding bars are one-to-one corresponding, and the moving grooves are formed in the length direction of the rotating shaft, so that the first gear slides in the length direction of the rotating shaft; The cleaning plate abuts against the inner wall of the screening cylinder; The end of the drive screw extending out of the rotating shaft is welded with a limiting ring, the diameter of the limiting ring is the same as the diameter of the rotating shaft, and a plurality of moving grooves for accommodating the sliding bars are formed on the limiting ring; 2. The construction waste recycling air separation system according to claim 1, characterized in that: A reset spring is sleeved on the rotating shaft, one end of the reset spring abuts against the second blocking plate, and the other end abuts against the inner wall of the collecting box. The pushing member (7) comprises a moving plate (71) slidably connected to the rotating shaft (17) and a pushing rod (72) fixedly installed on the moving plate (71), the frame (1) is provided with a fixed groove (55) for inserting the pushing rod (72), the moving plate (71) abuts against the first gear (31), when the first gear (31) is completely separated from the rotating shaft (17), the pushing rod (72) is completely located in the fixed groove (55), and at this time, the rotating shaft (17) is fixed to the frame (1).

3. A construction waste recycling air separation system according to claim 2, characterized in that: The inner wall of the screening cylinder (21) is slidably connected with an adjusting ring (4) for adjusting the size of the first screening hole (16). The adjusting ring (4) is provided with a second screening hole (41). The second screening hole (41) corresponds to the first screening hole (16). The area of the overlapping region of the first screening hole (16) and the second screening hole (41) is adjusted by sliding the adjusting ring (4). The larger the area of the overlapping region is, the larger the screened material particles are.

4. A construction waste recycling air separation system according to claim 3, characterized in that: The screening cylinder (21) is provided with an adjusting screw (42) for adjusting the position of the adjusting ring (4). The adjusting screw (42) is arranged on the adjusting ring (4) and is in threaded connection with the adjusting ring (4). When the adjusting screw (42) is rotated, the adjusting ring (4) is driven to move along the axis direction of the screening cylinder (21).

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