Aggregate screening and dust falling device for concrete regeneration processing

Abstract

The aggregate screening and dust falling device for concrete regeneration processing comprises a screening machine, a vibration screening assembly, a liquid guide pipeline and an integrated multidirectional dust falling mechanism, the screening machine comprises a machine body shell, a dust falling box, a top plate, a blocking box, a discharging hopper and a supporting frame, and a screening cavity is formed in the machine body shell; the dust falling box is installed at the bottom of the machine body shell and communicates with the screening cavity, the top plate is installed at the top of the machine body shell, the blocking box is located on one side of the top plate and connected with the machine body shell, the discharging hopper is installed at the top of the blocking box, and two sets of discharging openings are formed in the right end of the blocking box. The two sets of supporting frames are symmetrically installed on the two sides of the machine body shell, and the vibrating screen assembly is installed in the screening cavity. According to the concrete aggregate screening and dust falling device, dust generated in the screening process of the screening machine can be subjected to all-directional dust falling treatment, and the dust falling effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete regeneration equipment, in particular to an aggregate screening and dust reduction device for concrete regeneration processing. Background Art

[0002] Recycled concrete refers to new concrete made by crushing, cleaning, and grading discarded concrete blocks, then mixing them with graded concrete blocks in a specific proportion to partially or completely replace natural aggregates such as sand and gravel. Cement and water are then added to the mix to create this new concrete. Recycled concrete can be made using the following aggregate combinations: all recycled aggregate; recycled coarse aggregate and natural sand; natural crushed stone or pebbles as coarse aggregate and recycled fine aggregate; or recycled aggregate replacing part of the coarse or fine aggregate. The concrete recycling process requires aggregate screening, which is carried out based on particle size. Currently, this screening method primarily involves vibrating screens.

[0003] However, existing vibrating screens for screening concrete aggregates have the following problems during use: They raise a large amount of dust during the aggregate screening process, polluting the working environment. Although the vibrating screens are sometimes sealed, dust can still easily escape from the feed and discharge ports of the vibrating screens. There is a lack of a device structure for efficiently reducing dust on the vibrating screens. Therefore, a corresponding technical solution is needed to address these existing technical issues. Summary of the Invention

[0004] The purpose of the present invention is to provide an aggregate screening and dust reduction device for concrete recycling processing, which solves the technical problem that the existing vibrating screen will raise a large amount of dust during the aggregate screening process, causing pollution to the working environment. Although a sealed shell structure is sometimes used for the vibrating screen, dust is still easily discharged from the feed and discharge ports of the vibrating screen, and there is a lack of a device structure for efficiently reducing dust on the vibrating screen.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an aggregate screening and dust reduction device for concrete recycling processing, comprising a screening machine, a vibrating screening component, a liquid guide pipe and an integrated multi-directional dust reduction mechanism, the screening machine comprising a body shell, a dust reduction box, a top plate, a blocking box, a discharge funnel and a support frame, a screening cavity is formed inside the body shell, the dust reduction box is mounted on the bottom of the body shell and is connected to the screening cavity, the top plate is mounted on the top of the body shell, the blocking box is located on one side of the top plate and is connected to the body shell, the discharge funnel is mounted on the top of the blocking box, and two sets of discharge devices are provided at the right end of the blocking box The support frame is divided into two groups and symmetrically installed on both sides of the body shell. The vibrating screening assembly is installed in the screening cavity. The vibrating screening assembly includes a screen and several groups of vibration motors evenly distributed on the edge of the screen. The screen is divided into two groups and is arranged in parallel up and down. The lower ends of the two groups of screens are respectively connected to the two groups of discharge ports. The vibration motor is installed on the inner wall of the screening cavity and the vibrating end is connected to the screen. The liquid guide pipe includes a liquid inlet pipe, a one-way valve and a sewage pipe. The inner end of the liquid inlet pipe is connected to the integrated multi-directional dust reduction mechanism. The one-way valve is installed on the liquid inlet pipe, and the sewage pipe is installed at the right end of the dust reduction box.

[0006] The integrated multi-directional dust reduction mechanism includes a deformable liquid guide pipe, a transverse extrusion component, a feed end dust collector, a cavity dust collector and a discharge dust reduction plate. The deformable liquid guide pipe is located at the corner of the dust reduction box, and the transverse extrusion component is divided into two groups and respectively installed at the two ends of the deformable liquid guide pipe. The feed end dust collector is vertically installed in the middle of the deformable liquid guide pipe. The cavity dust collector is connected to the deformable liquid guide pipe through a pipeline. The cavity dust collector is laid in the dust reduction box. The discharge dust reduction plate is divided into two groups and respectively installed at the discharge port. The discharge dust reduction plate is connected to the cavity dust collector through a pipeline.

[0007] As a preferred embodiment of the present invention, the deformable liquid guide tube includes a liquid collection box located in the middle and hollow deformable tubes symmetrically installed at both ends of the liquid collection box. The hollow deformable tube is made of elastic rubber material and has several groups of extrusion grooves formed on the surface. The several groups of extrusion grooves are distributed in a stacked manner.

[0008] As a preferred embodiment of the present invention, the lateral extrusion assembly includes a driving motor and a screw installed on the power output end of the driving motor, a column is threaded through the screw, a push plate is fixed to the lower end of the column, a guide groove is provided at the bottom of the dust reduction box, the lower end of the push plate is slidably arranged in the guide groove, and the push plate is in contact with the hollow deformation tube.

[0009] As a preferred embodiment of the present invention, the feed end dust collector includes a metal riser, a return spring, a fan-shaped drainage plate and a driver. The lower end of the metal riser is rotatably connected to the liquid collection box, one end of the return spring is connected to the metal riser and the other end is connected to the inner wall of the dust collection box, the fan-shaped drainage plate is installed on the top of the metal riser, and the driver is installed on one side of the dust collection box and used in conjunction with the fan-shaped drainage plate.

[0010] As a preferred embodiment of the present invention, the fan-shaped liquid drainage plate includes a liquid accumulation plate with a fan-shaped structure and a plurality of groups of nozzles evenly installed on the surface of the liquid accumulation plate.

[0011] As a preferred embodiment of the present invention, the driver includes a servo motor and a rotating disk installed on the power output end of the servo motor. A toggle block is fixed to the edge of the rotating disk. The toggle block has a fan-shaped structure and the width of one end is smaller than the width of the other end. The toggle block is in contact with the effusion plate.

[0012] As a preferred embodiment of the present invention, the cavity dust collector includes a drainage main pipe and several groups of branch pipes symmetrically installed on both sides of the drainage main pipe, the branch pipes are provided with atomizing spray holes, and the tail of the drainage main pipe is connected to the discharge dust suppression plate.

[0013] As a preferred embodiment of the present invention, the discharge dust suppression plate includes an outer frame, a U-shaped tube and a nozzle. The outer frame is installed at the discharge port. The U-shaped tube is an inverted U-shaped structure. The nozzles are divided into several groups and are evenly installed on the U-shaped tube. The nozzles are facing the discharge port.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention designs a device for screening and dust reduction of concrete aggregates, which comprises a screening machine, a vibrating screening component, a liquid guide pipe and an integrated multi-directional dust reduction mechanism. When the aggregate needs to be screened, the aggregate to be sorted is introduced into the screening machine and enters the vibrating screening component, and the aggregate is screened through the screen. During the screening process, the liquid guide pipe guides water into the integrated multi-directional dust reduction mechanism, and the dust reduction water is atomized and guided to the inner cavity, feed port and discharge port of the screening machine through the integrated multi-directional dust reduction mechanism, so as to achieve multi-directional and efficient dust reduction treatment of the dust generated during the operation of the screening machine, thereby greatly improving the dust reduction effect of the screening machine.

[0016] 2. The concrete aggregate screening dust reduction device designed in the present invention can achieve all-round dust reduction treatment of the dust generated during the screening process of the screening machine, thereby improving the dust reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the overall structural diagram of the present invention;

[0018] Figure 2 This is a diagram showing the internal structure of the housing of the present invention;

[0019] Figure 3 This is a structural diagram of the integrated multi-directional dust reduction mechanism of the present invention;

[0020] Figure 4 This is a structural diagram of the cavity dust collector of the present invention;

[0021] Figure 5 This is the structural diagram of the discharge and dust suppression plate described in the present invention.

[0022] In the figure: 1. Body shell; 2. Dust suppression box; 3. Top plate; 4. Blocking box; 5. Feeding funnel; 6. Support frame; 7. Screening chamber; 8. Discharge port; 9. Screen; 10. Vibration motor; 11. Liquid inlet pipe; 12. One-way valve; 13. Drain pipe; 14. Deformable liquid guide pipe; 15. Horizontal extrusion assembly; 16. Feed end dust suppressor; 17. Cavity dust suppressor; 18. Discharge dust suppression plate; 19. Liquid accumulation box; 20. Hollow Deformation tube; 21. Extrusion groove; 22. Drive motor; 23. Screw; 24. Column; 25. Push plate; 26. Guide groove; 27. Metal riser; 28. Return spring; 29. Fan-shaped drainage plate; 30. Driver; 31. Liquid accumulation plate; 32. Nozzle; 33. Servo motor; 34. Rotating disk; 35. Toggle block; 36. Drainage main pipe; 37. Branch pipe; 38. Atomizing nozzle; 39. Outer frame; 40. U-shaped tube. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1-5The present invention provides a technical solution: an aggregate screening and dust reduction device for concrete recycling processing, comprising a screening machine, a vibrating screening component, a liquid guide pipe and an integrated multi-directional dust reduction mechanism. The screening machine comprises a body shell 1, a dust reduction box 2, a top plate 3, a blocking box 4, a discharge funnel 5 and a support frame 6. A screening cavity 7 is formed inside the body shell 1. The dust reduction box 2 is mounted on the bottom of the body shell 1 and is connected to the screening cavity 7. The top plate 3 is mounted on the top of the body shell 1. The blocking box 4 is located on one side of the top plate 3 and is connected to the body shell 1. The discharge funnel 5 is mounted on the top of the blocking box 4. Two sets of discharge ports 8 are opened at the right end of the blocking box 4. The support frame 6 is divided into two groups and is symmetrically installed on both sides of the body shell 1. The vibrating screening assembly is installed in the screening cavity 7. The vibrating screening assembly includes a screen 9 and several groups of vibration motors 10 evenly distributed on the edge of the screen 9. The screen 9 is divided into two groups and is arranged in parallel up and down. The lower ends of the two groups of screens 9 are respectively connected to the two groups of discharge ports 8. The vibration motor 10 is installed on the inner wall of the screening cavity 7 and the vibrating end is connected to the screen 9. The liquid guide pipe includes a liquid inlet pipe 11, a one-way valve 12 and a drain pipe 13. The inner end of the liquid inlet pipe 11 is connected to the integrated multi-directional dust reduction mechanism. The one-way valve 12 is installed on the liquid inlet pipe 11, and the drain pipe 13 is installed at the right end of the dust reduction box 2;

[0025] The integrated multi-directional dust reduction mechanism includes a deformable liquid guide tube 14, a transverse extrusion component 15, a feed end dust collector 16, a cavity dust collector 17 and a discharge dust reduction plate 18. The deformable liquid guide tube 14 is located at the corner of the dust reduction box 2. The transverse extrusion component 15 is divided into two groups and is respectively installed at the two ends of the deformable liquid guide tube 14. The feed end dust collector 16 is vertically installed in the middle of the deformable liquid guide tube 14. The cavity dust collector 17 is connected to the deformable liquid guide tube 14 through a pipeline. The cavity dust collector 17 is laid in the dust reduction box 2. The discharge dust reduction plate 18 is divided into two groups and is respectively installed at the discharge port 8. The discharge dust reduction plate 18 is connected to the cavity dust collector 17 through a pipeline.

[0026] Further improvement, such as Figure 3 As shown, the deformable liquid guide tube 14 includes a liquid storage box 19 located in the middle and a hollow deformable tube 20 symmetrically installed at both ends of the liquid storage box 19. The hollow deformable tube 20 is made of elastic rubber material and has a plurality of groups of extrusion grooves 21 formed on the surface. The plurality of groups of extrusion grooves 21 are distributed in a stacked manner. This design method can achieve the purpose of efficient water extrusion.

[0027] Further improvement, such as Figure 3As shown, the lateral extrusion assembly 15 includes a driving motor 22 and a screw 23 installed at the power output end of the driving motor 22. A column 24 is threadedly inserted on the screw 23, and a push plate 25 is fixed to the lower end of the column 24. A guide groove 26 is provided at the bottom of the dust suppression box 2. The lower end of the push plate 25 is slidably set in the guide groove 26. The push plate 25 is in contact with the hollow deformable tube 20 and is driven to rotate by the driving motor 22. During the rotation, the screw 23 drives the column 27 and the push plate 25 to move horizontally and squeeze the hollow deformable tube 20, so that the liquid in the hollow deformable tube 20 is squeezed out.

[0028] Further improvement, such as Figure 4 As shown, the dust collector 16 at the feed end includes a metal riser 27, a return spring 28, a fan-shaped drainage plate 29 and a driver 30. The lower end of the metal riser 27 is rotatably connected to the liquid storage box 19, one end of the return spring 28 is connected to the metal riser 27 and the other end is connected to the inner wall of the dust reduction box 2, the fan-shaped drainage plate 29 is installed on the top of the metal riser 27, and the driver 30 is installed on one side of the dust reduction box 2 and used in conjunction with the fan-shaped drainage plate 29. The metal riser 27 introduces water into the fan-shaped drainage plate 29, and the water is atomized and sprayed out through the nozzle 32. At the same time, the servo motor 33 drives the rotating disk 34 to rotate. During the rotation, the rotating disk 34 acts on the fan-shaped drainage plate 29 through the toggle block 35 to achieve the swinging treatment of the fan-shaped drainage plate 29, thereby improving the purpose of efficient dust reduction at the feed port position.

[0029] Further improvement, such as Figure 4 As shown, the fan-shaped liquid drainage plate 29 includes a liquid accumulation plate 31 with a fan-shaped structure and a plurality of groups of nozzles 32 evenly installed on the surface of the liquid accumulation plate 31. This design can improve the dust reduction effect on the feed port.

[0030] Further improvement, such as Figure 4 As shown, the driver 30 includes a servo motor 33 and a rotating disk 34 installed at the power output end of the servo motor 33. A toggle block 35 is fixed to the edge of the rotating disk 34. The toggle block 35 has a fan-shaped structure and the width of one end is smaller than the width of the other end. The toggle block 35 is in contact with the liquid accumulation plate 31. The servo motor 33 drives the rotating disk 34 to rotate. During the rotation process, the rotating disk 34 acts on the fan-shaped drainage plate 29 through the toggle block 35 to achieve the purpose of swinging the fan-shaped drainage plate 29, thereby improving the efficient dust reduction at the feed port position.

[0031] Further improvement, such as Figure 3As shown, the cavity dust collector 17 includes a drainage main pipe 36 and several groups of branch pipes 37 symmetrically installed on both sides of the drainage main pipe 36. Atomizing nozzles 38 are provided on the branch pipes 37. The tail of the drainage main pipe 36 is connected to the discharge dust reduction plate 18. The water is guided by the drainage main pipe 36 and diverted along the branch pipes 37. The water is atomized by the atomizing nozzles 38 and the screening chamber 7 is subjected to dust reduction treatment.

[0032] Specifically, the discharge dust reduction plate 18 includes an outer frame 39, a U-shaped tube 40 and a nozzle 32. The outer frame 39 is installed at the discharge port 8. The U-shaped tube 40 is an inverted U-shaped structure. The nozzles 32 are divided into several groups and are evenly installed on the U-shaped tube 40. The nozzles 32 are facing the discharge port 8. The water flow is guided through the U-shaped tube 40 and the water is atomized by the nozzle 32 to reduce the dust at the discharge port 8.

[0033] During use: the aggregate to be sorted is introduced into the sealing box 4 through the discharge funnel 5 and falls onto the screen 9. The screen 9 is driven to vibrate by the vibration motor 10 to achieve the purpose of screening the aggregate. The dust generated in the screening process is treated by the integrated multi-directional dust reduction mechanism. First, water is introduced into the horizontal extrusion component 15 through the liquid inlet pipe 11, and the screw 23 is driven to rotate by the driving motor 22. During the rotation, the screw 23 drives the column 27 and the push plate 25 to move horizontally and squeeze the hollow deformation tube 20, so that the liquid in the hollow deformation tube 20 is squeezed out, and the water flows into the feed end dust collector 16, the cavity dust collector 17 and the discharge dust reduction plate 18 respectively, and the water is atomized and sprayed out through the nozzle 32. At the same time, the servo motor 33 drives the rotating disk 34 to rotate. During the rotation, the rotating disk 34 acts on the fan-shaped drainage plate 29 through the toggle block 35 to swing the fan-shaped drainage plate 29, thereby improving the purpose of efficient dust reduction at the feed port position. The water is diverted through the drainage main pipe 36 and diverted along the branch pipe 37. The water is atomized through the atomizing nozzle 38 and the dust reduction treatment is performed on the screening chamber 7. The water flow is diverted through the U-shaped tube 40 and the water is atomized by the nozzle 32 to reduce the dust at the discharge port 8, thereby achieving the purpose of efficient dust reduction. In addition, through the extrusion intermittent dust reduction method, on the one hand, the purpose of dust reduction can be achieved, and on the other hand, the purpose of saving water resources can be achieved.

[0034] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one such feature.

[0036] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0037] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An aggregate screening and dust reduction device for concrete recycling, characterized by: The invention comprises a screening machine, a vibrating screening assembly, a liquid guide pipe and an integrated multi-directional dust reduction mechanism, wherein the screening machine comprises a machine body shell (1), a dust reduction box (2), a top plate (3), a blocking box (4), a discharge funnel (5) and a support frame (6); a screening cavity (7) is formed inside the machine body shell (1); the dust reduction box (2) is installed at the bottom of the machine body shell (1) and is connected to the screening cavity (7); the top plate (3) is installed at the top of the machine body shell (1); the blocking box (4) is located on one side of the top plate (3) and is connected to the machine body shell (1); the discharge funnel (5) is installed at the top of the blocking box (4); two groups of discharge ports (8) are opened at the right end of the blocking box (4); the support frame (6) is divided into two groups and is symmetrically installed outside the machine body On both sides of the shell (1), the vibrating screening assembly is installed in the screening cavity (7), the vibrating screening assembly includes a screen (9) and a plurality of groups of vibration motors (10) evenly distributed on the edge of the screen (9), the screen (9) is divided into two groups and is arranged in parallel up and down, the lower ends of the two groups of the screen (9) are respectively connected to the two groups of discharge ports (8), the vibration motor (10) is installed on the inner wall of the screening cavity (7) and the vibration end is connected to the screen (9), the liquid guide pipe includes a liquid inlet pipe (11), a one-way valve (12) and a sewage pipe (13), the inner end of the liquid inlet pipe (11) is connected to the integrated multi-directional dust reduction mechanism, the one-way valve (12) is installed on the liquid inlet pipe (11), and the sewage pipe (13) is installed at the right end of the dust reduction box (2); The integrated multi-directional dust suppression mechanism comprises a deformable liquid guide tube (14), a transverse extrusion assembly (15), a feed end dust suppressor (16), a cavity dust suppressor (17) and a discharge dust suppression plate (18); the deformable liquid guide tube (14) is located at a corner of the dust suppression box (2); the transverse extrusion assembly (15) is divided into two groups and respectively installed at the two ends of the deformable liquid guide tube (14); the feed end dust suppressor (16) is vertically installed in the middle of the deformable liquid guide tube (14); the cavity dust suppressor (17) is connected to the deformable liquid guide tube (14) through a pipeline; the cavity dust suppressor (17) is laid in the dust suppression box (2); the discharge dust suppression plate (18) is divided into two groups and respectively installed at the discharge port (8); and the discharge dust suppression plate (18) is connected to the cavity dust suppressor (17) through a pipeline.

2. The aggregate screening and dust reduction device for concrete recycling according to claim 1, characterized in that: The deformable liquid guide tube (14) comprises a liquid storage box (19) located in the middle and hollow deformable tubes (20) symmetrically installed at both ends of the liquid storage box (19). The hollow deformable tube (20) is made of elastic rubber material and has a plurality of groups of extrusion grooves (21) formed on its surface. The plurality of groups of extrusion grooves (21) are distributed in a stacked manner.

3. The aggregate screening and dust reduction device for concrete recycling according to claim 2, characterized in that: The transverse extrusion assembly (15) includes a driving motor (22) and a screw (23) installed at the power output end of the driving motor (22), a column (24) is threadedly inserted on the screw (23), a push plate (25) is fixed at the lower end of the column (24), a guide groove (26) is provided at the bottom of the dust suppression box (2), the lower end of the push plate (25) is slidably arranged in the guide groove (26), and the push plate (25) is in contact with the hollow deformation tube (20).

4. The aggregate screening and dust reduction device for concrete recycling according to claim 3, characterized in that: The feed end dust collector (16) includes a metal riser (27), a return spring (28), a fan-shaped drainage plate (29) and a driver (30). The lower end of the metal riser (27) is rotatably connected to the liquid storage box (19). One end of the return spring (28) is connected to the metal riser (27) and the other end is connected to the inner wall of the dust reduction box (2). The fan-shaped drainage plate (29) is installed on the top of the metal riser (27). The driver (30) is installed on one side of the dust reduction box (2) and is used in conjunction with the fan-shaped drainage plate (29).

5. The aggregate screening and dust reduction device for concrete recycling according to claim 4, characterized in that: The fan-shaped liquid discharge plate (29) comprises a liquid accumulation plate (31) in a fan-shaped structure and a plurality of groups of nozzles (32) evenly installed on the surface of the liquid accumulation plate (31).

6. The aggregate screening and dust reduction device for concrete recycling according to claim 5, characterized in that: The driver (30) comprises a servo motor (33) and a rotating disk (34) mounted on the power output end of the servo motor (33). A toggle block (35) is fixed to the edge of the rotating disk (34). The toggle block (35) is in a fan-shaped structure and has a width at one end smaller than that at the other end. The toggle block (35) contacts the effusion plate (31).

7. The aggregate screening and dust reduction device for concrete recycling according to claim 1, characterized in that: The cavity dust collector (17) comprises a drainage main pipe (36) and a plurality of branch pipes (37) symmetrically installed on both sides of the drainage main pipe (36), wherein the branch pipes (37) are provided with atomizing spray holes (38), and the tail of the drainage main pipe (36) is connected to the discharge dust suppression plate (18).

8. The aggregate screening and dust reduction device for concrete recycling according to claim 7, characterized in that: The discharge dust suppression plate (18) comprises an outer frame (39), a U-shaped tube (40) and a nozzle (32); the outer frame (39) is installed at the discharge port (8); the U-shaped tube (40) is an inverted U-shaped structure; the nozzle (32) is divided into several groups and is evenly installed on the U-shaped tube (40); the nozzle (32) is directly opposite the discharge port (8).

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