CN116727041A

CN116727041A - Multistage screening device for recycled aggregate crushing

Info

Publication number: CN116727041A
Application number: CN202310759160.3A
Authority: CN
Inventors: 李宗�; 张昆明
Original assignee: Jiangyin Shuntong Construction Machinery Co ltd
Current assignee: Jiangyin Shuntong Construction Machinery Co ltd
Priority date: 2023-06-26
Filing date: 2023-06-26
Publication date: 2023-09-12

Abstract

The application discloses a multistage screening device for crushing recycled aggregate, which relates to the technical field of screening devices. According to the application, through the cooperation of the screw nut moving rod and the supporting block, when aggregate is screened, aggregates with various diameters are respectively discharged through the discharge holes by the vibration motor, the first motor drives the ball screw when the screen holes are blocked, and then the ball screw rotates to drive the screw nut moving rod to move upwards, at the moment, the screw nut moving rod drives the supporting block, and further the supporting block can stably drive the first ejector rod, the second ejector rod and the third ejector rod to move upwards, so that the equipment can clean the screen holes of the first screen, the second screen and the third screen at the same time, and at the moment, the equipment can work normally, so that screening efficiency reduction caused by the screen holes blocking can be prevented, and further the screening efficiency and quality of the equipment can be ensured.

Description

Multistage screening device for recycled aggregate crushing

Technical Field

The application relates to the technical field of screening devices, in particular to a multi-stage screening device for crushing recycled aggregate.

Background

The construction waste recycled aggregate is small-particle recycled aggregate which is formed by crushing waste concrete blocks produced by building demolition, pavement repair, concrete production and the like, the aggregate is divided into coarse aggregate and fine aggregate, the coarse aggregate is material with the diameter being larger than 5mm, the coarse aggregate is divided into a plurality of grades, for example, 10-15 mm, 15-20 mm and other various sizes, and the recycled aggregate can be subjected to screening on the aggregate granularity through a screening device in the crushing process, so that the user can conveniently use the recycled aggregate subsequently.

According to the patent application number CN202320017939.3, the application discloses a multistage screening device for concrete aggregate, which relates to the field of concrete screening and comprises a box body arranged on the horizontal ground, wherein a feed inlet and an extraction opening are formed in the upper side of the box body, a discharge outlet is formed in the lower side wall of the box body, a multistage screening component for screening aggregate for multiple times is arranged in the box body, the multistage screening component comprises an upper screen plate and a lower screen plate which are respectively installed in the box body in a lifting manner from top to bottom, the aperture of the upper screen plate is larger than that of the lower screen plate, an upper outlet and a lower outlet are respectively formed in the side wall of the box body corresponding to the upper screen plate and the lower screen plate, an extraction pipe is connected to the box body through the extraction opening, and a dust removing component for removing dust is connected to one side of the extraction pipe, which is far away from the extraction pipe, of the extraction pipe. In the screening process, the exhaust pipe is matched with the exhaust fan to exhaust and send dust into the dust removing component, and the dust removing device can remove dust in the screening process.

However, when this equipment is sieving through last sieve and lower sieve, the material that partial size and screen cloth aperture differ little blocks up in the inside of sieve mesh easily, just is difficult to clear away the inside accumulational stone of sieve mesh through rocking of sieve this moment, and the jam of sieve mesh can influence the efficiency and the quality of the follow-up screening of screen cloth, and then can influence the efficiency of the whole processing of equipment.

Disclosure of Invention

The application aims to provide a multistage screening device for crushing recycled aggregate, which aims to solve the problems in the background technology.

In order to solve the technical problems, the application provides the following technical scheme: the utility model provides a broken multistage screening plant of using of regeneration aggregate, includes the box, the feed inlet, set up in the box top, breaker install in the box inner wall, box inner wall symmetry is equipped with two mounting panels, two equal fixedly connected with vibrating motor of mounting panel outer wall, the box inside is equipped with first screen cloth, the box inside is equipped with the second screen cloth, the box inside is equipped with the third screen cloth, first screen cloth and mounting panel fixed connection, second screen cloth and mounting panel fixed connection, third screen cloth and mounting panel fixed connection, the box inside be equipped with the first ejector pin of first screen cloth looks adaptation, the box inside be equipped with the second ejector pin of second screen cloth looks adaptation, the box inside be equipped with the third ejector pin of third screen cloth looks adaptation.

Further, two fixed blocks are symmetrically and fixedly connected to the inner wall of the box body, a plurality of first springs are fixedly connected to the tops of the fixed blocks, the tops of the first springs are fixedly connected with the mounting plate, and aggregate can be quickly screened through the cooperation of the first springs and the vibrating motor.

Further, a plurality of spacing grooves have been seted up to mounting panel inner wall symmetry, and is a plurality of the equal sliding connection in spacing groove has the stopper of looks adaptation, first ejector pin, second ejector pin and third ejector pin are all through stopper and spacing groove sliding connection, use through the cooperation of stopper and spacing groove for first ejector pin, second ejector pin and third ejector pin follow-up can steady removal.

Further, box inner wall fixed mounting has first motor, first motor output fixedly connected with ball screw, the outside cover of ball screw is equipped with the lead screw nut movable rod of a plurality of looks adaptations, and when ball screw rotated, the lead screw nut movable rod can remove along ball screw this moment, and then makes things convenient for the extrusion of lead screw nut movable rod to drive first ejector pin, second ejector pin and third ejector pin and remove, and then is convenient for clear up the sieve mesh inside.

Further, a plurality of equal fixedly connected with looks adaptation supporting shoe in lead screw nut movable rod top, the spout with lead screw nut movable rod looks adaptation has been seted up to the box inside, lead screw nut movable rod passes through spout and box sliding connection, through the setting of spout for lead screw nut movable rod can be steady remove.

Further, box outer wall equidistance fixedly connected with three discharge gate, first screen cloth one end extends to the inside that is located the top discharge gate, second screen cloth one end extends to the inside that is located the middle part discharge gate, third screen cloth one end extends to the inside that is located the bottom discharge gate, through the setting of discharge gate, is convenient for multiple different diameter aggregate to go on discharging respectively, and then is convenient for the user to collect.

Further, box outer wall fixedly connected with handles the case, it is circular to handle the case shape, it is two first recovery pipes to handle case top symmetry fixedly connected with, two equal fixedly connected with of first recovery pipe outer wall a plurality of second recovery pipes, two equal fixedly mounted with of first recovery pipe outer wall looks adaptation's air pump, it has a baffle to handle incasement wall fixedly connected with, baffle surface fixed mounting has first filter screen, the air outlet has been seted up to handle case one end, can block the dust of collecting through the setting of first filter screen, and then is convenient for follow-up concentrated collection to the dust of equipment to can prevent that the dust from drifting and causing harm to human and environment.

Further, a plurality of equal rotation of second recovery pipe inner wall is connected with the flabellum, the first pivot of flabellum one end fixedly connected with, a plurality of the equal fixedly connected with bracing piece of second recovery pipe inner wall, first pivot and bracing piece rotate to be connected with, a plurality of the equal fixedly connected with second filter screen of second recovery pipe inner wall, first pivot outer wall fixedly connected with and the first cleaning brush of second filter screen looks adaptation, through the cooperation use of flabellum and first cleaning brush, can prevent through the second filter screen that the aggregate from getting into inside the second recovery pipe, the pressure that produces through the air pump can make first cleaning brush of first pivot drive rotate simultaneously, and then can prevent that second filter screen surface from piling up a large amount of dust, and then can guarantee the ventilation efficiency of second filter screen.

Further, processing case top fixed mounting has the second motor, second motor output fixedly connected with second pivot, second pivot bottom fixedly connected with installation pole, installation pole bottom fixedly connected with and the second cleaning brush of first filter screen looks adaptation, logical groove has been seted up on the baffle surface, baffle bottom fixedly connected with collection box, the inside sliding connection of collection box has the recovery car, is convenient for handle first filter screen surface deposited dust through the second cleaning brush, and then can prevent dust and pile up the quality of bleeding that influences equipment, and then can guarantee the negative pressure that the air pump during operation produced, and then guarantee the quality and the efficiency of equipment collection dust.

Further, second installation pole bottom fixedly connected with first extrusion piece, two second springs of collection incasement wall symmetry fixedly connected with, the inside baffle that is equipped with logical groove looks adaptation of collection case, baffle bottom and second spring fixed connection, the baffle shape is isosceles trapezoid, baffle top fixedly connected with and the second extrusion piece of first extrusion piece looks adaptation, second extrusion piece shape is the arc, uses through the cooperation of first extrusion piece, second extrusion piece and second spring for equipment can accomplish the collection processing to the dust voluntarily, and then can reduce the burden that the user collected the dust.

Compared with the prior art, the application has the following beneficial effects:

1. according to the application, through the cooperation of the screw-nut moving rod and the supporting block, when a user needs to screen aggregate, at the moment, the vibration motor works to discharge aggregate with various diameters through the discharge ports, when the screen holes are blocked, the user can open the first motor to drive the ball screw, then the ball screw rotates to drive the screw-nut moving rod to move upwards, and at the moment, the screw-nut moving rod drives the supporting block, so that the supporting block can stably drive the first ejector rod, the second ejector rod and the third ejector rod to move upwards, and therefore, the equipment can clear the screen holes of the first screen, the second screen and the third screen at the same time, and at the moment, the equipment can work normally, so that the screening efficiency caused by the blocking of the screen holes is prevented from being reduced, and the screening efficiency and quality of the equipment can be ensured.

2. According to the application, through the cooperation of the second spring and the baffle, after dust enters the inside of the treatment box, the second cleaning brush can clean the dust on the surface of the first filter screen through the rotation of the mounting rod, so that the dust can be prevented from blocking the first filter screen to influence the ventilation efficiency of the first filter screen, and the negative pressure generated during the operation of the air pump can be ensured, and meanwhile, the first extrusion block can extrude the second extrusion block in the rotating process, so that the dust can automatically enter the inside of the recovery box, and further, the equipment can automatically complete the collection of the dust, and further, the load of the user on collecting the dust can be reduced, and meanwhile, the efficiency and the quality of the equipment on dust collection can be ensured.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, serve to explain the application. In the drawings:

FIG. 1 is a schematic cross-sectional elevation view of a housing of the present application;

FIG. 2 is a schematic side sectional view of the case of the present application;

FIG. 3 is a schematic top view of the first carrier rod;

FIG. 4 is a schematic view of the external structure of the connection of the case and the processing case of the present application;

FIG. 5 is a schematic view of a partial cross-sectional structure of a second recovery pipe according to the present application;

fig. 6 is an enlarged view of the structure at a of fig. 4.

In the figure: 1. a case; 2. a feed inlet; 3. a crushing device; 4. a mounting plate; 5. a vibration motor; 6. a first screen; 7. a second screen; 8. a third screen; 10. a first ejector rod; 11. a second ejector rod; 12. a third ejector rod; 13. a fixed block; 14. a first spring; 15. a limit groove; 16. a limiting block; 17. a first motor; 18. a ball screw; 19. a feed screw nut moving rod; 20. a support block; 21. a chute; 22. a discharge port; 23. a treatment box; 24. a first recovery pipe; 25. a second recovery pipe; 26. an air pump; 27. a partition plate; 28. a first filter screen; 29. an air outlet; 30. a fan blade; 31. a first rotating shaft; 32. a support rod; 33. a second filter screen; 34. a first cleaning brush; 35. a second motor; 36. a second rotating shaft; 37. a mounting rod; 38. a second cleaning brush; 39. a through groove; 40. a recovery box; 41. a first extrusion block; 42. a second spring; 43. a baffle; 44. and a second extrusion block.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Referring to fig. 1-3, the present application provides the following technical solutions: the utility model provides a multistage screening plant for recycled aggregate crushing, which comprises a box body 1, the feed inlet 2, open at box body 1 top, breaker 3 installs in box body 1 inner wall, box body 1 inner wall symmetry is equipped with two mounting panels 4, two mounting panel 4 outer wall all fixedly connected with vibrating motor 5, box body 1 is inside to be equipped with first screen cloth 6, box body 1 is inside to be equipped with second screen cloth 7, box body 1 is inside to be equipped with third screen cloth 8, first screen cloth 6 and mounting panel 4 fixed connection, second screen cloth 7 and mounting panel 4 fixed connection, third screen cloth 8 and mounting panel 4 fixed connection, box body 1 is inside to be equipped with first ejector pin 10 with first screen cloth 6 looks adaptation, box body 1 is inside to be equipped with second ejector pin 11 with second screen cloth 7 looks adaptation, box body 1 is inside to be equipped with third ejector pin 12 with third screen cloth 8 looks adaptation, box body 1 inner wall symmetry fixedly connected with two fixed blocks 13, the tops of the two fixed blocks 13 are fixedly connected with a plurality of first springs 14, the tops of the plurality of first springs 14 are fixedly connected with the mounting plate 4, a plurality of limit grooves 15 are symmetrically arranged on the inner wall of the mounting plate 4, limit blocks 16 which are matched with each other are slidably connected inside the plurality of limit grooves 15, the first ejector rod 10, the second ejector rod 11 and the third ejector rod 12 are slidably connected with the limit grooves 15 through the limit blocks 16, a first motor 17 is fixedly arranged on the inner wall of the box body 1, the output end of the first motor 17 is fixedly connected with a ball screw 18, a plurality of lead screw nut moving rods 19 which are matched with each other are sleeved outside the ball screw 18, a plurality of supporting blocks 20 which are matched with each other are fixedly connected with the tops of the plurality of lead screw nut moving rods 19 are arranged inside the box body 1, sliding grooves 21 which are matched with the lead screw nut moving rods 19 are slidably connected with the box body 1 through the sliding grooves 21, the equidistant fixedly connected with three discharge gate 22 of box 1 outer wall, first screen cloth 6 one end extends to the inside that is located top discharge gate 22, and 7 one end of second screen cloth extends to the inside that is located middle part discharge gate 22, and 8 one ends of third screen cloth extend to the inside that is located bottom discharge gate 22.

The implementation mode specifically comprises the following steps: when the equipment is used for crushing the waste building aggregate, firstly, the aggregate is added into the box body 1 through the feed inlet 2, then a user opens the crushing device 3, so that two gears are meshed, then the crushing roller is used for crushing the aggregate, then the crushed aggregate firstly falls on the surface of the first screen 6, at the moment, the vibration motor 5 works to drive the mounting plate 4 to vibrate integrally, so that the first screen 6, the second screen 7 and the third screen 8 on the mounting plate 4 vibrate simultaneously, further screening of the aggregate is realized, at the moment, the medium-size and small-size aggregates enter the surface of the second screen 7 through the first screen 6, then the second screen 7 vibrates to enable the smaller-diameter aggregates to fall on the surface of the third screen 8, and then the aggregates with three different sizes can be discharged from the three discharge holes 22 respectively under the vibration of the vibration motor 5, the device is convenient to screen aggregate, when the screen holes are blocked, a user can open the first motor 17 to drive the first motor 17 to rotate, then the ball screw 18 drives the screw nut moving rod 19 to move upwards along the chute 21, at the moment, the screw nut moving rod 19 can drive the supporting blocks 20 to respectively contact the bottoms of the first screen 6, the second screen 7 and the third screen 8, then the supporting blocks 20 can stably drag the first screen 6, the second screen 7 and the third screen 8 upwards, and further the device can stably move along the limiting grooves 15 through the limiting blocks 16, so that the device can accurately dredge the screen holes, and meanwhile, the device can simultaneously screen the screen holes while dredging the screen holes through the first ejector rod 10, the second ejector rod 11 and the third ejector rod 12, so that the screening efficiency can be ensured, meanwhile, the screening efficiency can be prevented from being influenced by the blocking of the screen holes, and the screening efficiency of the equipment can be improved.

Referring to fig. 1, 4, 5 and 6, the present application provides the following technical solutions: the utility model provides a multistage screening plant for recycled aggregate crushing, in addition, the outer wall fixedly connected with treatment box 23 of box 1, the shape of treatment box 23 is circular, two first recovery pipes 24 of treatment box 23 top symmetry fixedly connected with, two first recovery pipes 24 outer wall all fixedly connected with a plurality of second recovery pipes 25, two first recovery pipes 24 outer wall all fixedly mounted have looks adaptation air pump 26, treatment box 23 inner wall fixedly connected with baffle 27, baffle 27 surface fixedly mounted has first filter screen 28, air outlet 29 has been seted up to treatment box 23 one end, a plurality of second recovery pipes 25 inner wall all rotate and are connected with flabellum 30, flabellum 30 one end fixedly connected with first pivot 31, a plurality of second recovery pipes 25 inner wall all fixedly connected with bracing piece 32, first pivot 31 and bracing piece 32 rotate and are connected, a plurality of second recovery pipes 25 inner wall all fixedly connected with second filter screen 33, the outer wall of the first rotating shaft 31 is fixedly connected with a first cleaning brush 34 matched with the second filter screen 33, the top of the treatment tank 23 is fixedly provided with a second motor 35, the output end of the second motor 35 is fixedly connected with a second rotating shaft 36, the bottom of the second rotating shaft 36 is fixedly connected with a mounting rod 37, the bottom of the mounting rod 37 is fixedly connected with a second cleaning brush 38 matched with the first filter screen 28, the surface of the partition plate 27 is provided with a through groove 39, the bottom of the partition plate 27 is fixedly connected with a recovery tank 40, the inside of the recovery tank 40 is slidingly connected with a recovery vehicle, the bottom of the second mounting rod 37 is fixedly connected with a first extrusion block 41, the inner wall of the recovery tank 40 is symmetrically and fixedly connected with two second springs 42, the inside of the recovery tank 40 is provided with a baffle 43 matched with the through groove 39, the bottom of the baffle 43 is fixedly connected with the second springs 42, the shape of the baffle 43 is isosceles trapezoid, the top of the baffle 43 is fixedly connected with a second extrusion block 44 matched with the first extrusion block 41, the second extrusion 44 is arc-shaped.

The implementation mode specifically comprises the following steps: because the aggregate can generate a large amount of dust during crushing and screening, in order to prevent dust from scattering to harm human bodies and the environment, dust emission is needed to be treated when the equipment crushes the aggregate, when the equipment crushes and screens the aggregate, a user can simultaneously open the air pump 26 to work, the air pump 26 pumps the dust generated by crushing and screening in the box body 1 through the first recovery pipe 24 and the second recovery pipe 25, firstly, the dust enters the second recovery pipe 25 through the second filter screen 33, the second filter screen 33 is a large-caliber screen, the main function of the second filter screen 33 is to prevent the aggregate from entering the second recovery pipe 25, when the high-altitude airflow passes through the fan blades 30, the fan blades 30 drive the first rotating shaft 31 to rotate, so that the first cleaning brush 34 can clean the surface of the second filter screen 33, and dust accumulated at the second filter screen 33 can be reduced, the ventilation quality of the device can be ensured, the dust extraction quality of the device is ensured, when dust enters the treatment box 23, a user turns on the second motor 35 to work at the moment, then the second motor 35 drives the second rotating shaft 36, the mounting rod 37 and the second cleaning brush 38 to rotate, the second cleaning brush 38 can treat dust accumulated on the surface of the first filter screen 28 at the moment, the dust accumulation can be prevented from influencing the ventilation quality of the first filter screen 28, the negative pressure of the device can be ensured, after the dust is cleaned by the second cleaning brush 38, the dust moves to the inside of the through groove 39 along with the second cleaning brush 38, at the moment, the first extrusion block 41 is rotationally contacted with the second extrusion block 44 along with the mounting rod 37, then the second extrusion block 44 is extruded to drive the baffle 43 to extrude the first extrusion block 41, at the moment, the second spring 42 is contracted, dust enters into the inside recovery car of recovery tank 40 through logical groove 39, and then make equipment can accomplish the collection to the dust voluntarily, and after first extrusion piece 41 continues rotatory along with installation pole 37, second spring 42 kick-backs makes baffle 43 block up logical groove 39 once more, and then can prevent that the dust from the inside of recovery tank 40 is in the inside of getting into processing case 23, and then can reduce the required time of user's clearance first filter screen 28, make equipment can accomplish the collection to the dust voluntarily simultaneously, and then reduced the required time of user's clean first filter screen 28, also guarantee the efficiency of equipment collection dust simultaneously, and then improved the work efficiency of equipment.

The working principle of the application is as follows:

referring to fig. 1 to 3, when a user needs to screen aggregate through the cooperation of the screw nut moving rod 19 and the supporting block 20, the vibration motor 5 works to discharge aggregate with various diameters through the plurality of discharge ports 22, when the screen holes are blocked, the user can open the first motor 17 to drive the ball screw 18, then the ball screw 18 rotates to drive the screw nut moving rod 19 to move upwards, the screw nut moving rod 19 drives the supporting block 20, and then the supporting block 20 can stably drive the first ejector rod 10, the second ejector rod 11 and the third ejector rod 12 to move upwards, so that the screen holes of the first screen 6, the second screen 7 and the third screen 8 can be cleaned, and the equipment can work normally, so that screening efficiency reduction caused by the screen hole blocking can be prevented, and further the screening efficiency and quality of the equipment can be ensured.

Further, referring to fig. 1, 4, 5 and 6 of the specification, through the cooperation of the second spring 42 and the baffle 43, after dust enters the treatment tank 23, the second cleaning brush 38 can clean dust on the surface of the first filter screen 28 through the rotation of the mounting rod 37, so that the dust can be prevented from blocking the first filter screen 28 to affect the ventilation efficiency of the first filter screen 28, and negative pressure generated during the operation of the air pump 26 can be ensured, and meanwhile, the first extrusion block 41 can extrude the second extrusion block 44 in the rotating process, so that dust can automatically enter the recovery tank 40, further, the dust can be automatically collected by the device, further, the load of collecting dust by a user can be reduced, and meanwhile, the efficiency and quality of dust collection by the device can be ensured.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present application, and the present application is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present application has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The multi-stage screening device for crushing the recycled aggregate comprises a box body (1);

the feed inlet (2) is formed in the top of the box body (1);

the crushing device (3) is arranged on the inner wall of the box body (1);

the method is characterized in that:

the utility model discloses a vibrating screen is characterized by comprising a box body (1), wherein two mounting plates (4) are symmetrically arranged on the inner wall of the box body (1), vibrating motors (5) are fixedly connected on the outer wall of each mounting plate (4), a first screen (6) is arranged inside the box body (1), a second screen (7) is arranged inside the box body (1), a third screen (8) is arranged inside the box body (1), the first screen (6) is fixedly connected with the mounting plates (4), the second screen (7) is fixedly connected with the mounting plates (4), the third screen (8) is fixedly connected with the mounting plates (4), a first ejector rod (10) matched with the first screen (6) is arranged inside the box body (1), and a third ejector rod (12) matched with the third screen (8) is arranged inside the box body (1).

2. A multi-stage screening device for crushing recycled aggregate according to claim 1, wherein: two fixed blocks (13) are symmetrically and fixedly connected to the inner wall of the box body (1), a plurality of first springs (14) are fixedly connected to the tops of the two fixed blocks (13), and the tops of the first springs (14) are fixedly connected with the mounting plate (4).

3. A multi-stage screening device for crushing recycled aggregate according to claim 1, wherein: a plurality of limit grooves (15) are symmetrically formed in the inner wall of the mounting plate (4), a plurality of limit grooves (15) are internally and slidably connected with limit blocks (16) which are matched with each other, and the first ejector rod (10), the second ejector rod (11) and the third ejector rod (12) are slidably connected with the limit grooves (15) through the limit blocks (16).

4. A multi-stage screening device for crushing recycled aggregate according to claim 1, wherein: the novel portable electronic device is characterized in that a first motor (17) is fixedly arranged on the inner wall of the box body (1), a ball screw (18) is fixedly connected to the output end of the first motor (17), and a plurality of matched screw nut moving rods (19) are sleeved outside the ball screw (18).

5. The multi-stage screening device for crushing recycled aggregate according to claim 4, wherein: the top of each screw-nut moving rod (19) is fixedly connected with a supporting block (20) which is matched with the screw-nut moving rod, a sliding groove (21) which is matched with the screw-nut moving rod (19) is formed in the box body (1), and the screw-nut moving rod (19) is in sliding connection with the box body (1) through the sliding groove (21).

6. A multi-stage screening device for crushing recycled aggregate according to claim 1, wherein: the novel automatic feeding and discharging device is characterized in that three discharging holes (22) are fixedly connected to the outer wall of the box body (1) at equal intervals, one end of the first screen (6) extends to the inside of the top discharging hole (22), one end of the second screen (7) extends to the inside of the middle discharging hole (22), and one end of the third screen (8) extends to the inside of the bottom discharging hole (22).

7. A multi-stage screening device for crushing recycled aggregate according to claim 1, wherein: the utility model discloses a treatment box, including box (1) outer wall fixedly connected with treatment box (23), treatment box (23) shape is circular, two first recovery pipes (24) of treatment box (23) top symmetry fixedly connected with, two equal fixedly connected with of first recovery pipe (24) outer wall a plurality of second recovery pipes (25), two equal fixedly mounted of first recovery pipe (24) outer wall has air pump (26) of looks adaptation, treatment box (23) inner wall fixedly connected with baffle (27), baffle (27) fixed surface installs first filter screen (28), air outlet (29) have been seted up to treatment box (23) one end.

8. The multi-stage screening device for crushing recycled aggregate according to claim 7, wherein: a plurality of equal rotation of second recovery tube (25) inner wall is connected with flabellum (30), flabellum (30) one end fixedly connected with first pivot (31), a plurality of equal fixedly connected with bracing piece (32) of second recovery tube (25) inner wall, first pivot (31) are connected with bracing piece (32) rotation, a plurality of equal fixedly connected with second filter screen (33) of second recovery tube (25) inner wall, first pivot (31) outer wall fixedly connected with and first cleaning brush (34) of second filter screen (33) looks adaptation.

9. The multi-stage screening device for crushing recycled aggregate according to claim 7, wherein: the treatment box is characterized in that a second motor (35) is fixedly arranged at the top of the treatment box (23), a second rotating shaft (36) is fixedly connected to the output end of the second motor (35), a mounting rod (37) is fixedly connected to the bottom of the second rotating shaft (36), a second cleaning brush (38) matched with the first filter screen (28) is fixedly connected to the bottom of the mounting rod (37), a through groove (39) is formed in the surface of the partition plate (27), a recovery box (40) is fixedly connected to the bottom of the partition plate (27), and a recovery vehicle is connected to the inside of the recovery box (40) in a sliding mode.

10. The multi-stage screening device for crushing recycled aggregate according to claim 9, wherein: the utility model discloses a novel plastic extrusion device, including first installation pole (37) and second installation pole, first extrusion piece (41) of second installation pole (37) bottom fixedly connected with, two second springs (42) of recovery case (40) inner wall symmetry fixedly connected with, inside baffle (43) that are equipped with logical groove (39) looks adaptation of recovery case (40), baffle (43) bottom and second spring (42) fixed connection, baffle (43) shape is isosceles trapezoid, baffle (43) top fixedly connected with and second extrusion piece (44) of first extrusion piece (41) looks adaptation, second extrusion piece (44) shape is the arc.