A recycled concrete aggregate production process and preparation system

Abstract

The present application discloses a recycled concrete aggregate production process and a preparation system thereof, which includes: a crushing device installed on a frame; a screening box arranged on the frame and connected to the discharging end of the crushing device at the top; a screening device arranged in the screening box for screening the crushed aggregate; a first feed pipe installed on the frame and connected to the bottom of the screening box and used to transport the aggregate screened by the screening device; a second feed pipe installed on the frame and connected to both sides of the screening box; and a material transfer device arranged in the screening box for transferring the aggregate left on the screening device to the second feed pipe. When the present application is used, the coarse aggregate can be further processed and screened to meet actual needs, so as to improve the scope of application of the preparation system.

Description

Technical Field

[0001] The invention relates to the field of concrete aggregate processing, and in particular to a recycled concrete aggregate production process and a preparation system thereof. Background Art

[0002] With the acceleration of urban construction and renovation in recent years, the pollution problem of construction waste has become increasingly prominent. Since construction waste contains many recyclable building materials, such as many raw materials that can be used as recycled concrete products or aggregates, many companies will crush these solid construction wastes and then use them in urban construction.

[0003] At present, the traditional way of processing these solid construction wastes is still relatively simple, mainly using crushing equipment to crush them, and then transporting them to the construction site after they are crushed to a certain specification. Although this method can reduce the pollution caused by construction waste, with the development needs of the city, different construction projects will have different requirements for the specifications of aggregates. For example, some construction projects require smaller aggregate particles. In this regard, it is necessary to improve traditional production equipment and processes. Summary of the invention

[0004] The purpose of this application is to provide a recycled concrete aggregate production process and a preparation system thereof, which can further process and screen coarse aggregate to meet actual needs and improve the application scope of the preparation system.

[0005] The present application provides a system for preparing recycled concrete aggregate, which adopts the following technical solution:

[0006] A recycled concrete aggregate preparation system comprises: a crushing device installed on a frame; a screening box arranged on the frame and the top of which is connected to the discharging end of the crushing device; a screening device arranged in the screening box for screening the crushed aggregate; a first feed pipe installed on the frame and connected to the bottom of the screening box and used for conveying the aggregate screened by the screening device; a second feed pipe installed on the frame and connected to both sides of the screening box; and a material transfer device arranged in the screening box for transferring the aggregate left on the screening device to the second feed pipe.

[0007] By adopting the above technical scheme, the crushing device set up can crush the construction waste to form aggregates. After the aggregates are screened by the screening device in the screening box, the fine aggregates that meet the requirements will be transported to a predetermined position through the first feed pipe, and the coarse aggregates that do not meet the requirements will be sent to the second feed pipe under the operation of the material shifting device, and then carry out subsequent processing. Through this scheme, the aggregates can be effectively screened to meet different actual needs, thereby increasing the scope of application of the present application.

[0008] The present application further provides: the screening device comprises: a bearing plate arranged around the inner wall of the screening box; a frame plate placed on the bearing plate; a sieve plate arranged on the frame plate with a middle height and two bottom sides; and a shock absorbing assembly arranged between the sieve plate and the bearing plate.

[0009] By adopting the above technical solution, the sieve plate with a high middle and low sides can increase the screening range of aggregates, which is conducive to more thorough screening of aggregates. The set shock-absorbing component can buffer the impact of aggregates on the sieve plate, which can not only protect the sieve plate, but also enhance the screening effect of the sieve plate.

[0010] The present application further arranges: the shock absorbing assembly includes: a vertical cylinder vertically installed on the frame plates on both sides of the screening box; a vertical rod slidably inserted in the vertical cylinder; an elastic member arranged between the vertical cylinder and the bottom of the vertical rod; a bearing rod installed between the top of the vertical rod and abutting against the middle position of the screen plate; and a plurality of springs connected between the screen plate and the frame plate.

[0011] By adopting the above technical solution, when the aggregate impacts the screen plate, the elastic member can drive the vertical rod to telescope and slide in the vertical tube to cushion the screen plate, and the spring can further cushion and reduce shock of the screen plate and the aggregate on the basis of the elastic member.

[0012] The present application further provides: the material shifting device includes: a rotating rod rotatably installed between the screening boxes and parallel to the load-bearing rod; a material shifting plate fixed to the rotating rod by a symmetrical telescopic rod and in contact with the screen plate; a compression spring mounted on the telescopic rod and with its ends respectively in contact with the material shifting plate and the rotating rod; and a first driving member installed on the screening box for driving the rotating rod to rotate, wherein the screen plate is bent toward the pipe mouth of the second material delivery pipe on the side away from the load-bearing rod.

[0013] By adopting the above technical solution, when the first driving member is turned on, the rotating rod can be driven to rotate. During the rotation process, the rotating rod will drive the material stripping plate to strip the aggregate on the screen plate, so as to strip the aggregate that does not meet the requirements into the second material conveying pipe. The provided compression spring can not only protect the material stripping plate, but also make the bearing surface of the material stripping plate and the screen plate more adaptable, which is more conducive to stripping the aggregate.

[0014] The present application is further configured as follows: a strip slot is horizontally opened on the outer side of the screening box, an extension rod passing through the strip slot is fixed on the outer side of the frame plate, a servo motor is installed on the outer side of the screening box, the output end of the servo motor is keyed to a cam abutting against the extension rod, and a return spring is connected between the side of the frame plate close to the second feed pipe and the inner wall of the screening box.

[0015] By adopting the above technical solution, when the servo motor is turned on, the cam can be driven to rotate, and the cam and the return spring cooperate with each other, so that the frame plate can be conveniently driven to move back and forth in the screening box through the extension rod to increase the screening effect of the screen plate.

[0016] The present application is further arranged as follows: a material receiving box with an open top is installed on the frame, a slat is installed on the top of the material receiving box, an end of the slat away from the second material conveying pipe is hinged with a rotating ring, a screen drum is rotatably installed in the rotating ring, an annular plate is rotatably installed on the end of the screen drum away from the rotating ring, a second driving member for driving the screen drum to rotate is arranged on the annular plate, an adjusting component for adjusting the angle of the screen drum is arranged on the material receiving box, a secondary crushing device is arranged on the frame, the discharge end of the second material conveying pipe is connected with the secondary crushing device, a hose is arranged between the discharge port of the secondary crushing device and the annular plate, the bottom wall of the material receiving box is inclined toward the direction of the first material conveying pipe, and the material receiving box is connected to the first material conveying pipe through a pipeline.

[0017] By adopting the above technical scheme, the secondary crushing device can crush the aggregates that do not meet the requirements again on the basis of the crushing device to improve the utilization efficiency of the present application, and the screen drum can screen the secondary crushed aggregates under the drive of the second driving member to improve the utilization rate of the aggregates. When it is necessary to adjust the inclination angle of the screen drum, the screen drum can also be adjusted through the adjustment component to adapt to actual needs.

[0018] The present application further provides: the adjustment assembly includes: a triangular block fixed at the bottom of the annular plate; a slide plate horizontally slidably mounted on the strip; an inclined block fixed on the slide plate and adapted to the triangular block; and a third driving member mounted on the strip plate for driving the slide plate to slide.

[0019] By adopting the above technical solution and opening the third driving member, the slide plate can be driven to slide horizontally on the slat. During the sliding of the slide plate, the inclined block can abut against the triangular block to rotate the screen drum to a predetermined angle. This structural design is ingenious and has obvious effects.

[0020] The present application further arranges: the strip is slidably arranged on the top of the material receiving box along its own length direction, a vertical rod is fixed to the end of the strip away from the rotating ring, and a connecting rod which movably penetrates into the screening box and is fixed to the frame plate is fixed to the top of the vertical rod.

[0021] By adopting the above technical solution, when the servo motor is turned on, it can not only drive the screen plate to move horizontally, but also drive the screen drum to reciprocate horizontally. The combination of the two can not only achieve outstanding aggregate screening effect but also save energy.

[0022] The present application further arranges: the frame is provided with a dust hood above the screen cylinder, and the dust hood is connected to the dust collection device through a dust collection pipe.

[0023] By adopting the above technical solution, when the dust collection device is turned on, the dust generated in the surrounding area can be cleaned through the dust collection hood. At the same time, since the dust also contains a large amount of lime powder, it can also be used as subsequent construction materials, thus achieving multiple goals at one stroke and saving costs.

[0024] The present application also provides a recycled concrete aggregate production process, comprising the following steps:

[0025] Step 1: Put the solid construction waste into the crushing device for crushing;

[0026] Step 2: Use the screening device to screen the aggregate processed by the crushing device, and at the same time, start the material transfer device to transport the aggregate screened on the screen plate to the screen drum through the second material delivery pipe;

[0027] Step 3: Turn on the second driving member to drive the screen drum to rotate, so as to perform secondary screening on the aggregate;

[0028] Step 4: Turn on the vacuum cleaner to remove dust.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] By setting a crushing device and a screening device, the two cooperate with each other to perform preliminary screening of aggregates, and the secondary crushing device and the screen drum can further screen the aggregates on the basis of the screening device to meet different actual needs, thereby increasing the scope of application of the present application;

[0031] By setting an adjustment component, the angle of the screen drum can be adjusted to change the speed at which the screen drum screens aggregates. By connecting the slats and frame plates with vertical rods, the screen drum and the screen plate can be driven to reciprocate synchronously with the power of a servo motor to increase the screening effect on aggregates. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0033] Figure 2 It is a schematic diagram of the structure of the screening device in the embodiment of the present application;

[0034] Figure 3 It is a structural schematic diagram of the screen drum and the adjustment assembly in the embodiment of the present application;

[0035] Figure 4 Schematic diagram of the positions of the servo motor and the extension rod in the embodiment of the present application.

[0036] Explanation of the reference numerals in the accompanying drawings: 1. frame; 10. crushing device; 11. first feed pipe; 12. second feed pipe; 13. hose; 2. screening box; 21. load-bearing plate; 210. frame plate; 22. screen plate; 23. vertical cylinder; 24. vertical rod; 25. load-bearing rod; 26. rotating rod; 27. telescopic rod; 28. material removal plate; 291. strip notch; 292. extension rod; 293. servo motor; 294. cam; 3. material collection box; 30. strip plate; 31. rotating ring; 32. screen cylinder; 33. annular plate; 34. triangular block; 35. slide plate; 36. tilting block; 37. vertical rod; 371. connecting rod; 38. dust hood; 39. dust pipe; 4. servo motor; 41. gear; 42. annular gear plate. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with the accompanying drawings.

[0038] The present application embodiment discloses a system for preparing recycled concrete aggregate. Figure 1 and Figure 2 As shown, it includes: a crushing device 10 installed on a frame 1, the crushing device is used to crush solid construction waste, a screening box 2 is installed on the frame 1, the top of the screening box 2 is connected to the discharge port of the crushing device 10, when the crushing device 10 completes the crushing of aggregates, it can directly enter the screening box 2, in order to be able to screen the aggregates to meet different actual needs, a screening device is provided in the screening box 2.

[0039] In this embodiment, the screening device includes: a supporting plate 21 arranged around the inner wall of the screening box 2, a frame plate 210 is placed on the supporting plate 21, the frame plate 210 is adapted to the supporting plate 21, and a screen plate 22 is arranged on the frame plate 210. In order to increase the screening effect, the screen plate 22 is arranged to have a convex middle and concave sides, so that the aggregate can be screened from the middle along the supporting surface of the screen plate 22. At the same time, in order to protect the screen plate 22 and further increase the screening effect, a shock absorbing assembly is also arranged between the screen plate 22 and the supporting plate 21.

[0040] Among them, the shock-absorbing assembly includes: a vertical cylinder 23 vertically installed on the frame plate 210 on both sides of the screening box 2, a vertical rod 24 slidingly inserted in the vertical cylinder 23 along the vertical direction, and an elastic member is arranged between the bottom of the vertical rod 24 and the inside of the vertical cylinder 23. The elastic member of this embodiment can be a shock-absorbing spring, and a load-bearing rod 25 is installed between the top of the vertical rod 24. The load-bearing rod 25 can abut against the protruding part of the middle position of the screen plate 22. At the same time, a plurality of springs are connected between the edge of the screen plate 22 and the frame plate 210. When the crushed aggregate impacts the screen plate 22, the shock-absorbing spring and the spring arranged on the edge of the screen plate 22 will play a buffering and protective role on the screen plate 22. On the basis of protecting the screen plate 22, the vibration frequency of the screen plate 22 can also be increased, which is beneficial to the screening of aggregates.

[0041] Among them, a first feed pipe 11 is installed on the frame 1, and the first feed pipe 11 is connected to the bottom of the screening box 2, so that the fine aggregate screened by the screen plate 22 can be transported to a predetermined place through the first feed pipe 11. In addition, second feed pipes 12 are installed on both sides of the screening box 2 of the frame 1, and a material shifting device is also provided in the screening box 2. When the screen plate 22 completes the screening of the aggregate, the large-particle aggregate remaining on the screen plate 22 can enter the second feed pipe 12 under the action of the material shifting device to achieve the screening of coarse aggregate and fine aggregate.

[0042] In this embodiment, the material-discharging device includes: a rotating rod 26 rotatably installed between the inner walls of the screening box 2, the rotating rod 26 and the load-bearing rod 25 are parallel to each other, and symmetrical telescopic rods 27 are fixed at both ends of the rotating rod 26, and a material-discharging plate 28 parallel to the rotating rod 26 is fixed at one end of the telescopic rod 27 away from the rotating rod 26. At the same time, a compression spring is movably sleeved on the telescopic rod 27, one end of the compression spring abuts against the rotating rod 26, and the other end abuts against the material-discharging plate 28. The compression spring utilizes its own elasticity to make the material-discharging plate 28 adapt to the load-bearing surface of the screen plate 22 to better discharge the material, wherein a first driving member that drives the rotating rod 26 to rotate is also installed on the screening box 2. It should be noted that the side of the screen plate 22 away from the load-bearing rod 25 is bent toward the pipe mouth of the second material delivery pipe 12.

[0043] When the first driving member is turned on, the rotating rod 26 can be driven to rotate. During the rotation process, the rotating rod 26 will drive the material shifting plate 28 to shift the aggregate on the screen plate 22, so that the aggregate enters the corresponding second material conveying pipe 12 from both sides of the second screen plate 22.

[0044] like Figure 4As shown, in order to further increase the screening effect of the screen plate 22, in the present embodiment, a strip slot 291 is horizontally opened on the outer side of the screening box 2, an extension rod 292 passing through the strip slot 291 is fixed on the outer side of the frame plate 210, and a servo motor 293 is also installed on the outer side of the screening box 2, and a cam 294 is keyed on the output shaft of the servo motor 293. In addition, a return spring is installed between the side of the frame plate 210 close to the second feed pipe 12 and the inner wall of the screening box 2, and under the action of the return spring, the cam 294 is always in contact with the extension rod 292.

[0045] When the servo motor 293 is turned on, the cam 294 is driven to rotate. The cam 294 interacts with the return spring to drive the extension rod 292 to move back and forth in the strip slot 291, so that the extension rod 292 drives the frame plate 210 and the screen plate 22 to reciprocate together, which is beneficial to the screening of aggregates.

[0046] like Figure 1 and Figure 3 As shown, in order to improve the utilization efficiency of the preparation system, in this embodiment, a secondary crushing device is also installed on the frame 1, and the discharge end of the second feed pipe 12 is connected to the feed port of the secondary crushing device, wherein a material receiving box 3 with an open top is also installed on the frame 1, and a strip board 30 is horizontally installed on the top of the material receiving box 3, and a rotating ring 31 is hinged at one end of the strip board 30 away from the second feed pipe 12, and a screen drum 32 is rotatably installed in the rotating ring 31, and the extension direction of the screen drum 32 is consistent with the opening direction of the rotating ring 31, and an annular plate 33 is rotatably installed at one end of the screen drum 32 away from the rotating ring 31, and a second driving member for driving the screen drum 32 to rotate is provided on the annular plate 33.

[0047] In order to adapt to different actual needs and adjust the screening speed of the screen drum 32, in this embodiment, an adjustment component for adjusting the angle of the screen drum 32 is also provided on the material receiving box 3. It should be noted that a hose 13 is provided between the discharge port of the secondary crushing device and the annular plate 33. The hose 13 can be a corrugated tube, so that the aggregate after the secondary crushing can enter the screen drum 32 through the hose 13 for screening, and the fine aggregate will fall directly into the material receiving box 3, and the still coarse aggregate will be discharged from the discharge port of the screen drum 32. In order to facilitate the discharge of the material receiving box 3, in this embodiment, the bottom wall of the material receiving box 3 is tilted toward the direction of the first feed pipe 11, and the discharge port of the material receiving box 3 is connected to the first feed pipe 11 through a pipeline, so that the fine aggregate that meets the requirements can finally be transported to the predetermined place through the first feed pipe 11.

[0048] In this embodiment, the adjustment component includes: a triangular block 34 fixed at the bottom of the annular plate 33, a slide plate 35 installed on the strip plate 30 for horizontal sliding, an inclined block 36 matched with the triangular block 34 is fixed on the slide plate 35, the inclined surface of the inclined block 36 is parallel to the inclined surface of the triangular block 34, and a third driving member is also installed on the strip plate 30, the third driving member is used to drive the slide plate 35 to slide, when it is necessary to adjust the angle between the screen drum 32 and the ground, the third driving member can be turned on to drive the slide plate 35 to slide, and when the slide plate 35 slides, it will abut against the triangular block 34 through the inclined block 36, thereby achieving the purpose of adjusting the screen drum 32.

[0049] In addition, in order to increase the effect of the screen drum 32 and the screen plate 22 in screening fine aggregate, in this embodiment, the strip plate 30 is slidably set on the top of the material receiving box 3 along its own length direction, and a vertical rod 37 is fixed at the end of the strip plate 30 away from the rotating ring 31, and a connecting rod 371 is fixed on the top of the vertical rod 37. The connecting rod 371 penetrates from both sides of the screening box 2 and is fixed to the frame plate 210.

[0050] When the servo motor 293 drives the frame plate 210 to drive the screen plate 22 to do reciprocating motion, it can also drive the strip plate 30 to do horizontal reciprocating motion through the connecting rod 371 and the vertical rod 37, so that the screen cylinder 32 on the strip plate 30 also does reciprocating motion.

[0051] Taking into account that dust and powder may fly everywhere during the actual screening of aggregates, in this embodiment, a dust hood 38 is provided on the frame 1 and above the screen drum 32. The dust hood 38 is connected to a dust collection device (not shown in the figure) through a dust collection pipe 39. When the dust collection device is turned on, the dust and powder generated by the screening of aggregates can be adsorbed and collected through the dust collection pipe 39 and the dust hood 38, and the collected lime powder can also be used as building materials, which is both energy-saving and environmentally friendly.

[0052] It should be noted that the first driving member in this embodiment can adopt a relatively common motor, and the third driving member can adopt a relatively common cylinder or hydraulic cylinder, wherein the second driving member includes: a servo motor 4 installed on a ring plate 33, a gear 41 is installed on the output shaft of the servo motor 4, and an annular gear plate 42 is provided on the outer ring of the screen drum 32, and the annular gear plate 42 and the gear 41 are meshed with each other. When the servo motor 4 is turned on, the annular gear plate 42 can be driven to rotate by the gear 41, thereby driving the screen drum 32 to rotate to screen the aggregate.

[0053] This embodiment also provides a recycled concrete aggregate production process, which mainly includes the following steps:

[0054] Step 1: Put the solid construction waste into the crushing device 10 for crushing;

[0055] Step 2: The aggregate processed by the crushing device 10 is screened by the screening device. At the same time, the material-dispensing device is turned on to convey the aggregate screened on the screen plate 22 to the secondary crushing device through the second conveying pipe 12 for crushing, and then the secondary crushed aggregate is conveyed to the screen drum 32;

[0056] Step 3: Turn on the servo motor 4 of the second driving member to drive the screen drum 32 to rotate, so as to perform secondary screening on the aggregate;

[0057] Step 4: Turn on the vacuum cleaner to remove dust.

[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A system for preparing recycled concrete aggregate, characterized in that: include: A crushing device (10) mounted on the frame (1); A screening box (2) disposed on the frame (1) and having a top connected to a discharge end of the crushing device (10); A screening device arranged in the screening box (2) for screening the crushed aggregate; A first conveying pipe (11) installed on the frame (1) and connected to the bottom of the screening box (2) and used for conveying aggregate screened by the screening device; A second material delivery pipe (12) installed on the frame (1) and connected to both sides of the screening box (2); and a material transfer device arranged in the screening box (2) for transferring aggregates left on the screening device to the second material delivery pipe (12); The screening device comprises: a bearing plate (21) arranged around the inner wall of a screening box (2); a frame plate (210) placed on the bearing plate (21); a screening plate (22) arranged on the frame plate (210) with a high middle and low sides; and a shock absorbing assembly arranged between the screening plate (22) and the frame plate (210); The shock absorbing assembly comprises: a vertical cylinder (23) vertically mounted on the frame plates (210) on both sides of the screening box (2); a vertical rod (24) slidably inserted into the vertical cylinder (23); an elastic member arranged between the vertical cylinder (23) and the bottom of the vertical rod (24); a bearing rod (25) mounted between the tops of the vertical rod (24) and abutting against the middle position of the screen plate (22); and a plurality of springs connected between the screen plate (22) and the frame plate (210); The material shifting device comprises: a rotating rod (26) rotatably mounted between the screening boxes (2) and parallel to the bearing rod (25); symmetrical telescopic rods (27) fixed at both ends of the rotating rod (26); a material shifting plate (28) fixed to the rotating rod (26) by the symmetrical telescopic rod (27) and in contact with the screen plate (22); a compression spring sleeved on the telescopic rod (27) and with ends respectively in contact with the material shifting plate (28) and the rotating rod (26); and a first driving member mounted on the screening box (2) for driving the rotating rod (26) to rotate, wherein the screen plate (22) is bent toward the pipe opening of the second material conveying pipe (12) on a side away from the bearing rod (25); The frame (1) is provided with a material receiving box (3) with an open top, a strip plate (30) is provided on the top of the material receiving box (3), one end of the strip plate (30) away from the second material conveying pipe (12) is hingedly connected to a rotating ring (31), a screen drum (32) is rotatably installed in the rotating ring (31), one end of the screen drum (32) away from the rotating ring (31) is rotatably installed with an annular plate (33), a second driving member for driving the screen drum (32) to rotate is provided on the annular plate (33), an adjusting component for adjusting the angle of the screen drum (32) is provided on the material receiving box (3), a secondary crushing device is provided on the frame (1), a discharge end of the second material conveying pipe (12) is connected to the secondary crushing device, a hose (13) is provided between the discharge port of the secondary crushing device and the annular plate (33), a bottom wall of the material receiving box (3) is arranged to be inclined toward the direction of the first material conveying pipe (11), and the material receiving box (3) is connected to the first material conveying pipe (11) through a pipeline; The adjustment assembly comprises: a triangular block (34) fixed to the bottom of the annular plate (33); a slide plate (35) mounted on the strip plate (30) for horizontal sliding; an inclined block (36) fixed on the slide plate (35) and adapted to the triangular block (34); and a third driving member mounted on the strip plate (30) for driving the slide plate (35) to slide; The strip plate (30) is slidably arranged on the top of the material receiving box (3) along its own length direction, and a vertical rod (37) is fixed to one end of the strip plate (30) away from the rotating ring (31), and a connecting rod (371) is fixed to the top of the vertical rod (37) and is movably inserted into the screening box (2) and fixed to the frame plate (210).

2. A recycled concrete aggregate preparation system according to claim 1, characterized in that: The outer side of the screening box (2) is horizontally provided with a strip-shaped slot (291); an extension rod (292) passing through the strip-shaped slot (291) is fixed to the outer side of the frame plate (210); a servo motor (293) is installed on the outer side of the screening box (2); an output end of the servo motor (293) is key-connected with a cam (294) abutting against the extension rod (292); and a return spring is connected between the side of the frame plate (210) close to the second material conveying pipe (12) and the inner wall of the screening box (2).

3. A recycled concrete aggregate preparation system according to claim 1, characterized in that: The frame (1) is provided with a dust hood (38) at a position above the screen drum (32); the dust hood (38) is connected to a dust collection device via a dust collection pipe (39).

4. A recycled concrete aggregate production process, based on the recycled concrete aggregate preparation system according to claim 3, comprising the following steps: Step 1: putting solid construction waste into a crushing device (10) for crushing; Step 2: using a screening device to screen the aggregate processed by the crushing device (10), and at the same time, starting the material transfer device to transport the aggregate screened on the screen plate (22) into the screen drum (32) through the second material delivery pipe (12); Step 3: turning on the second driving member to drive the screen drum (32) to rotate, so as to perform secondary screening on the aggregate; Step 4: Turn on the vacuum cleaner to remove dust.

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