CN114618764A

CN114618764A - Recycled concrete aggregate screening plant

Info

Publication number: CN114618764A
Application number: CN202210188623.0A
Authority: CN
Inventors: 解宝军; 吴国树; 吴光锐
Original assignee: Wencheng Lvju Hongneng Concrete Co ltd
Current assignee: Wencheng Lvju Hongneng Concrete Co ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-06-14
Anticipated expiration: 2042-02-28
Also published as: CN114618764B

Abstract

The application relates to a recycled concrete aggregate screening device which comprises a rack, wherein a feeding bin for storing aggregate is arranged on the rack, a screening mechanism positioned below a discharge port of the feeding bin is arranged on the rack, the screening mechanism is used for screening large granular aggregate, and the screening mechanism comprises a first material channel for the outflow of the large granular aggregate and a second material channel for the outflow of residual aggregate; a first conveying mechanism, a second conveying mechanism and a third conveying mechanism for conveying aggregates are arranged in the frame; the first material channel is connected with the first conveying mechanism, and the second conveying mechanism is used for connecting aggregate flowing out of the second material channel; the second conveying mechanism is provided with a screen used for screening medium-sized granular aggregates, and a material guiding plate opposite to the screen is erected on the second conveying mechanism. The method and the device have the advantages that the screening work of the mixed aggregate is realized, the screened aggregate is conveniently and subsequently utilized reasonably, and the utilization rate of resources is improved.

Description

Recycled concrete aggregate screening plant

Technical Field

The application relates to the field of concrete processing equipment, in particular to a recycled concrete aggregate screening device.

Background

Along with the development of the urbanization process of China, the discharge amount of construction waste is increased year by year, and the proportion of renewable components is also continuously improved. However, most of the construction waste is not treated at all and is transported to the suburbs or the periphery of cities for simple landfill or open stockpiling, which wastes land and resources and pollutes the environment. The production and utilization of construction waste recycled aggregate are of great significance to save resources, protect the environment and realize sustainable development of the construction industry, so the aggregate prepared from waste concrete is called recycled concrete aggregate.

After the construction waste is crushed by the crusher, the crushing degrees of the construction waste with different textures are different, and if the obtained concrete aggregate is divided according to the volume, the concrete aggregate can be roughly divided into large-sized particle aggregate, medium-sized particle aggregate and fine aggregate; and when the aggregate that will obtain is transported in industry, the aggregate of different volume specifications will be mixed together, and the aggregate after the mixture is unfavorable for the recovery work in later stage, makes the aggregate of different volume specifications difficult to obtain rational utilization finally.

Disclosure of Invention

Aggregate in order to improve and mix together is unfavorable for the recovery work in later stage, leads to the aggregate of different volume specifications to be difficult to obtain the problem of rational utilization, this application provides a recycled concrete aggregate screening plant.

The application provides a recycled concrete aggregate screening plant adopts following technical scheme:

a recycled concrete aggregate screening device comprises a rack, wherein a feeding bin for storing aggregates is arranged on the rack, a screening mechanism is arranged on the rack and positioned below a discharging port of the feeding bin, the screening mechanism is used for screening large granular aggregates, and the screening mechanism comprises a first material channel for allowing the large granular aggregates to flow out and a second material channel for allowing residual aggregates to flow out; a first conveying mechanism, a second conveying mechanism and a third conveying mechanism for conveying aggregates are arranged in the frame; the first material channel is connected with a first conveying mechanism, and the second conveying mechanism is used for connecting aggregate flowing out of the second material channel; the second conveying mechanism is provided with a screen for screening medium-sized granular aggregates, the second conveying mechanism is provided with a material guiding plate which is over against the screen, and the material guiding plate is connected with the third conveying mechanism.

By adopting the technical scheme, the mixed aggregate treated by the crusher is poured into the feeding bin, the mixed aggregate poured out of the discharging port of the feeding bin is sieved by the sieving mechanism during working, large granular aggregate flows out of the first material channel of the sieving mechanism onto the first conveying mechanism, and the sieved large granular aggregate is conveyed independently by the first conveying mechanism; the residual aggregate flows out of the second material channel to the second conveying mechanism, the mixed aggregate falling onto the second conveying mechanism is screened by the screen, medium-sized granular aggregate with relatively large volume cannot pass through the screen and is left on the second conveying mechanism, and the medium-sized granular aggregate is independently conveyed by the second conveying mechanism; the fine aggregate with relatively small volume falls onto the lower guide plate through the screen and falls onto the third transportation mechanism under the guidance of the guide plate, and the independent transportation of the fine aggregate is realized through the third transportation mechanism; finally, large-sized particle aggregate, medium-sized particle aggregate and fine aggregate are smoothly screened out, so that the screening work of mixed aggregate is realized, the screened aggregate is conveniently and reasonably utilized subsequently, and the utilization rate of resources is improved.

Optionally, the screening mechanism includes a screening seat, and the first material channel is obliquely arranged above the screening seat in a downward inclined manner; a first perforation is arranged on the first material channel in a penetrating way, and the aperture of the first perforation is larger than that of the screen mesh; the second material channel is arranged below the screening seat, and a second through hole penetrates through the second material channel; the second perforations have a smaller aperture than the first perforations, and the second perforations are larger than the mesh.

By adopting the technical scheme, when the mixed aggregate falls onto the first material channel, the large granular aggregate cannot pass through the first through hole and falls onto the first conveying mechanism along the first material channel, and the first material channel which is obliquely arranged downwards can enable the large granular aggregate to flow out from the first material channel more smoothly; and the rest aggregate will successfully fall to the second transportation mechanism through the second perforation arranged on the second material channel.

Optionally, the screening mechanism further comprises a swinging device for driving the screening seat to swing back and forth, a support is arranged between the screening seat and the material guiding plate, one end of the support is fixedly connected with the screening seat, and the other end of the support is fixedly connected with the material guiding plate.

By adopting the technical scheme, the screening seat can do reciprocating swing back and forth in the rack under the driving of the swing device during working; through the reciprocating swing of the sieving seat, the large granular aggregate falling on the first material channel can more smoothly fall on the first conveying mechanism below by utilizing the inertia principle, so that the probability of the large granular aggregate being clamped on the first material channel is effectively reduced; meanwhile, with the reciprocating swing of the screening seat, the medium-sized particle aggregate and the fine aggregate falling on the second material channel can be scattered, and the adhesion among the aggregates is reduced, so that the medium-sized particle aggregate and the fine aggregate are smoothly separated, and the subsequent screening work is facilitated; because the screening seat is connected with the material guiding plate through the support, the synchronous reciprocating swing of the material guiding plate along with the screening seat is realized during the work, and fine aggregates can more smoothly fall onto the third conveying mechanism from the material guiding plate along with the reciprocating swing of the material guiding plate.

Optionally, a push plate is rotatably arranged in the screening seat, ejector rods are arranged on the side wall, close to the first material channel, of the push plate, the ejector rods correspond to the first through holes one by one, the first through holes are respectively located on the corresponding ejector rod rotating paths, and the first through holes are used for the corresponding ejector rods to insert; a push rod is movably arranged on the side wall of the push plate, which is far away from the ejector rod, and the other end of the push rod is arranged on the rack; the push rod is used for driving the push plate to rotate towards the direction close to or far away from the first material channel.

By adopting the technical scheme, when the screening seat swings in a reciprocating manner under the driving of the swinging device, the push rod drives the push plate to rotate towards the direction close to or far away from the first material channel; when the push plate is pushed by the push rod to rotate towards the direction close to the first material channel, the ejector rod is inserted into the corresponding first through hole, and the aggregate clamped in the first through hole can be cleaned under the action of the ejector rod, so that the first through hole is dredged, and the condition that the aggregate blocks the first through hole is effectively prevented; when the screening seat removed to the direction of keeping away from the push rod, the push rod will drive the push pedal and rotate to the direction of keeping away from first material way, and finally the ejector pin will follow and shift out in the first perforation, and the aggregate that accords with the standard this moment just can pass through first perforation smoothly.

Optionally, a sealing plate for controlling the opening and closing of the discharge port of the feeding bin is slidably arranged on the feeding bin, and the sealing plate slides along the swinging direction of the screening seat; a connecting rod is arranged between the first material channel and the sealing plate, one end of the connecting rod is connected with the sealing plate, and the other end of the connecting rod is connected with the first material channel.

By adopting the technical scheme, when the screening seat drives the sealing plate to open the discharge hole of the feeding bin, the aggregate is poured out from the discharge hole of the feeding bin; when the screening seat drives the sealing plate to close the discharge hole of the feeding bin, the aggregate cannot be poured out from the discharge hole of the feeding bin; when the screening seat is in work, the screening seat is driven by the swing device to swing in a reciprocating manner, so that the discharge hole of the feeding bin can swing along with the swing of the screening seat, and the periodic opening and closing can be realized; the discharge port of the feeding bin is periodically opened and closed, so that the situation that the screening seat is difficult to smoothly separate aggregates due to overlarge flow of the aggregates in the feeding bin in a continuously opened state of the discharge port can be effectively prevented, and the screening work of the screening seat is guaranteed to be smoothly carried out.

Optionally, when the closing plate closes the discharge hole of the feeding bin, the ejector rod is inserted into the first through hole.

By adopting the technical scheme, when the screening seat drives the sealing plate to close the discharge hole of the feeding bin, the aggregate cannot flow out of the discharge hole of the feeding bin, and the ejector rod is inserted into the first through hole, so that the aggregate clamped in the first through hole can be smoothly ejected out by the ejector rod; the discharge hole in a closed state ensures the ejection work of the ejector rod, and reduces the interference of continuous blanking of the discharge hole on the ejection work of the ejector rod.

Optionally, the number of the third transportation mechanisms is at least two, and the third transportation mechanisms are symmetrically arranged on two sides of the second transportation mechanism; the end part of the guide plate inclines towards the direction close to the adjacent third conveying mechanism and is erected on the adjacent third conveying mechanism.

By adopting the technical scheme, when the fine aggregate falls onto the guide plate through the screening of the screen, the fine aggregate respectively falls onto the corresponding third conveying mechanisms from two ends of the guide plate, and the fine aggregate is divided by the guide plate due to the relatively large proportion of the fine aggregate, so that the probability of the fine aggregate forming accumulation on the guide plate can be reduced; and fine aggregates are ensured to be smoothly distributed to the corresponding third conveying mechanism from the material guiding plate.

Optionally, a buffer plate is arranged on the side wall of the material guiding plate facing the screening seat, and a spring is arranged between the buffer plate and the material guiding plate; one end of the spring is connected with the buffer plate, and the other end of the spring is connected with the material guiding plate.

Through adopting above-mentioned technical scheme, when the fine aggregate falls to the buffer board, through setting up at the buffer board and draw the spring between the flitch, can play the absorbing effect of buffering to drawing the flitch, also can reduce the impact of fine aggregate and buffer board simultaneously, played the effect of protection to the buffer board.

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

the screening work of large-scale granular aggregate, medium-sized granular aggregate and fine aggregate is realized, and the screening of mixed aggregate is completed, so that the screened aggregate is conveniently and reasonably utilized, and the utilization rate of resources is improved.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.

Fig. 2 is a schematic view of the internal structure of the hidden rack in fig. 1.

Fig. 3 is a schematic view of a portion of the highlighted screening mechanism of fig. 2.

FIG. 4 is a partial schematic view of another perspective of the highlighting mechanism of FIG. 3.

FIG. 5 is a schematic view of a portion of the salient seed plate of FIG. 2.

Description of reference numerals: 1. a frame; 10. a blanking seat; 2. a feeding bin; 21. closing the plate; 22. a connecting rod; 3. a screening mechanism; 30. a screening seat; 31. a first material channel; 32. a second material channel; 321. a first perforation; 33. a second perforation; 34. a swing device; 341. a drive disc; 342. a drive rod; 343. a slider; 344. a slideway; 35. a support; 36. pushing the plate; 361. a chute; 37. a top rod; 38. a push rod; 4. a first transport mechanism; 5. a second transport mechanism; 51. screening a screen; 6. a third transport mechanism; 7. a fuse plate; 71. a buffer plate; 72. a spring.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses recycled concrete aggregate screening plant. Referring to fig. 1 and 2, the recycled concrete aggregate screening device comprises a frame 1, a funnel-shaped feeding bin 2 for storing mixed aggregate is fixedly mounted at the top of the frame 1, and a discharge hole located in the frame 1 is formed in the bottom of the feeding bin 2. A screening mechanism 3 which is positioned right below a discharge port of the feeding bin 2 is installed in the frame 1, and the screening mechanism 3 is used for screening large granular aggregates in the mixed aggregates. A first transportation mechanism 4 for transporting the screened large granular aggregate, a second transportation mechanism 5 for transporting the screened medium granular aggregate and a third transportation mechanism 6 for transporting the screened fine aggregate are sequentially arranged in the frame 1.

As shown in fig. 2 and 3, the sieving mechanism 3 includes a sieving base 30 with a hollow interior, and a first material passage 31 disposed at the top of the sieving base 30, the first material passage 31 is obliquely and downwardly inclined, and a large number of first through holes 321 are arranged on the first material passage 31 at regular intervals. First material way 31 is towards the discharge gate of feeding bin 2, and first perforation 321 is arranged in sieving the large-scale granule aggregate in the aggregate that will mix, and large-scale granule aggregate will be unable to pass through first perforation 321 smoothly, finally flows out along the incline direction of first material way 31. The first transport mechanism 4 includes a conveyor belt having an upper surface that is conveyed in a horizontal direction, and a motor for driving the conveyor belt to rotate. The first transportation mechanism 4 further comprises a blanking seat 10 erected above the conveyor belt, and the upper end surface of the blanking seat 10 is obliquely and downwardly inclined. The top of the blanking seat 10 is connected with the first material channel 31, and the bottom of the blanking seat 10 is erected on the upper layer of the conveyor belt of the first conveying mechanism 4. The blanking seat 10 is used for guiding the large granular aggregate flowing out of the first chute 31 onto the conveyor belt of the first transport mechanism 4.

As shown in fig. 3 and 4, the sieving mechanism 3 further includes a second material passage 32 fixedly installed at the bottom of the sieving seat 30, the second material passage 32 is horizontally disposed, a large number of second through holes 33 uniformly spaced are perforated on the second material passage 32, and the aperture of the second through holes 33 is smaller than the aperture of the first through holes 321. The second through holes 33 are used for allowing the residual aggregates screened by the first material channel 31 to flow out of the screening base 30. The second transport mechanism 5 includes a screen 51 on which the upper layer is transported in the horizontal direction, and a motor for driving the screen 51 to rotate. The upper layer of the screen 51 is opposite to the second material channel 32, and the aggregates flowing out of the second perforations 33 fall onto the screen 51 during operation. The screen 51 is used to screen the medium-sized granular aggregates among the remaining aggregates, which cannot pass through the meshes of the screen 51, and finally, the medium-sized granular aggregates are carried out of the housing 1 following the screen 51. The mesh 51 has a smaller pore size than the second perforations 33.

As shown in fig. 3 and 4, the sieving mechanism 3 further includes a swinging device 34, and the swinging device 34 is used for driving the sieving seat 30 to perform periodic reciprocating swinging in the horizontal direction in the machine frame 1. In this embodiment, the number of the swing devices 34 is two, and the swing devices 34 are symmetrically arranged on the side walls of the sieving base 30 facing away from each other. The swing device 34 includes a motor, a driving disk 341 is fixedly mounted on an output shaft of the motor, and the driving disk 341 is coaxial with the output shaft of the motor. An eccentric driving rod 342 is rotatably mounted on the driving disk 341, and a slider 343 is rotatably mounted at one end of the driving rod 342 far away from the driving disk 341. The inner side wall of the frame 1 is provided with a slide rail 344 extending along the horizontal direction, and the sliders 343 are slidably disposed in the respective adjacent slide rails 344 along the horizontal direction. The sliding block 343 is fixedly connected to the outer side wall of the sieving seat 30, and after the swing device 34 is started, the driving rod 342 will drive the sliding block 343 to slide in the slide channel 344 in a periodic reciprocating manner with the rotation of the driving disc 341, and at the same time, the sliding block 343 will drive the sieving seat 30 to swing in a reciprocating manner.

As shown in fig. 3 and 4, a push plate 36 is rotatably mounted inside the sieving seat 30, push rods 37 are fixedly mounted on the side wall of the push plate 36 facing the first material channel 31, and the push rods 37 correspond to the first through holes 321 one by one. The diameter of the top rod 37 is smaller than the diameter of the first through hole 321, the first through holes 321 are respectively located on the rotation path of the top rod 37, and the first through holes 321 can be inserted by the top rods 37. The side wall of the push plate 36, which is far away from the top rod 37, is provided with a sliding groove 361, and the sliding groove 361 extends along the length direction of the push plate 36. The sliding groove 361 is movably connected with a push rod 38, and the push rod 38 slides along the length direction of the sliding groove 361. The other end of the push rod 38 penetrates out of the screening base 30, the penetrated push rod 38 is fixed with the inner side wall of the rack 1, and the push rod 38 is integrally arranged along the swinging direction of the screening base 30.

When the sieving base 30 is driven by the swing device 34 to swing back and forth, the push rod 38 will drive the push plate 36 to rotate towards or away from the first material channel 31. When the push rods 37 are inserted into the corresponding first through holes 321, the aggregate stuck in the first through holes 321 can be pushed out by the push rods 37.

As shown in fig. 3 and 4, a sealing plate 21 for controlling the opening and closing of the discharge port below the feeding bin 2 is slidably mounted on the feeding bin 2, and the sealing plate 21 slides along the swinging direction of the sieving seat 30. Two groups of connecting rods 22 which are symmetrically arranged are arranged between the first material channel 31 and the sealing plate 21, one end of each connecting rod 22 is rotatably connected with the bottom of the sealing plate 21, and the other end of each connecting rod 22 is rotatably connected with the upper end face of the first material channel 31. When the sieving seat 30 swings back and forth, the connecting rod 22 pushes the closing plate 21 to realize the periodic opening and closing of the discharge hole of the feeding bin 2. When the connecting rod 22 pushes the closing plate 21 to close the discharge hole of the feeding chamber 2, the push rod 37 is inserted into the deepest portion of the first through hole 321.

As shown in fig. 3 and 5, the number of the third transportation mechanisms 6 is at least two, and the embodiment is exemplified by two groups. The third transport mechanism 6 is symmetrically arranged at two sides of the first transport mechanism 4, and the third transport mechanism 6 comprises a conveyor belt which is arranged at the upper layer and is used for conveying along the horizontal direction and a motor which is used for driving the conveyor belt to rotate. The second transportation mechanism 5 is provided with a material guiding plate 7 arranged between the upper and lower layers of screens 51, and the material guiding plate 7 is opposite to the upper layer of screens 51. The second transportation mechanism 5 is located right above the first transportation mechanism 4, and the third transportation mechanism 6 is also symmetrically located at two sides of the second transportation mechanism 5. Two ends of the material guiding plate 7 are inclined downwards towards the direction close to the adjacent third conveying mechanism 6, and the bottom of the material guiding plate 7 is erected above the third conveying mechanism 6.

As shown in fig. 3 and 5, a buffer plate 71 is attached to the side wall of the leader plate 7 facing the upper screen 51, and the buffer plate 71 is bent in the direction of inclination of the leader plate 7. A plurality of groups of springs 72 are arranged between the buffer plate 71 and the material guiding plate 7, the upper ends of the springs 72 are fixedly connected with the buffer plate 71, and the lower ends of the springs 72 are fixedly connected with the material guiding plate 7. A support 35 is installed between the screening seat 30 and the material guiding plate 7, one end of the support 35 is fixedly connected with the screening seat 30, and the other end of the support 35 is fixedly connected with the material guiding plate 7. When the screening base 30 is oscillated back and forth, the guide plate 7 will oscillate synchronously with the screening base 30 via the bracket 35.

The implementation principle of the recycled concrete aggregate screening device in the embodiment of the application is as follows: the mixed aggregate processed by the crusher is poured into the feeding bin 2, the mixed aggregate poured out from the discharge port of the feeding bin 2 is sieved by the sieving mechanism 3 during working, the large granular aggregate flows out of the first material channel 31 of the sieving mechanism 3 to the first conveying mechanism 4, and the sieved large granular aggregate is conveyed independently by the first conveying mechanism 4. The rest aggregate flows out of the second material channel 32 to the second conveying mechanism 5, the mixed aggregate falling onto the second conveying mechanism 5 is screened by the screen 51, medium-sized granular aggregate with relatively large volume cannot pass through the screen 51 and is left on the second conveying mechanism 5, and the medium-sized granular aggregate is independently conveyed by the second conveying mechanism 5. And the fine aggregate with relatively small volume falls onto the lower guide plate 7 through the screen 51 and falls onto the third transportation mechanism 6 under the guide of the guide plate 7, and the independent transportation of the fine aggregate is realized through the third transportation mechanism 6. Finally, large-sized particle aggregate, medium-sized particle aggregate and fine aggregate are smoothly screened out, so that the screening work of mixed aggregate is realized, the screened aggregate is conveniently and reasonably utilized subsequently, and the utilization rate of resources is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a recycled concrete aggregate screening plant, includes frame (1), its characterized in that: the screening machine is characterized in that a feeding bin (2) for storing aggregate is arranged on the rack (1), a screening mechanism (3) located below a discharge port of the feeding bin (2) is arranged on the rack (1), the screening mechanism (3) is used for screening large granular aggregate, and the screening mechanism (3) comprises a first material channel (31) for the large granular aggregate to flow out and a second material channel (32) for the residual aggregate to flow out; a first conveying mechanism (4), a second conveying mechanism (5) and a third conveying mechanism (6) for conveying aggregate are arranged in the rack (1); the first material channel (31) is connected with the first conveying mechanism (4), and the second conveying mechanism (5) is used for connecting aggregate flowing out of the second material channel (32); the second conveying mechanism (5) is provided with a screen (51) for screening medium-sized granular aggregates, the second conveying mechanism (5) is erected with a material guiding plate (7) opposite to the screen (51), and the material guiding plate (7) is connected with the third conveying mechanism (6).

2. The recycled concrete aggregate screening apparatus of claim 1, wherein: the screening mechanism (3) comprises a screening seat (30), and the first material channel (31) is obliquely and downwards arranged above the screening seat (30); a first perforation (321) penetrates through the first material channel (31), and the aperture of the first perforation (321) is larger than that of the screen (51); the second material channel (32) is arranged below the screening seat (30), and a second through hole (33) penetrates through the second material channel (32); the second perforations (33) have a smaller aperture than the first perforations (321), and the second perforations (33) are larger than the mesh (51).

3. The recycled concrete aggregate screening apparatus of claim 2, wherein: the screening mechanism (3) further comprises a swinging device (34) used for driving the screening seat (30) to swing in a reciprocating mode, a support (35) is arranged between the screening seat (30) and the material guiding plate (7), one end of the support (35) is fixedly connected with the screening seat (30), and the other end of the support (35) is fixedly connected with the material guiding plate (7).

4. The recycled concrete aggregate screening apparatus of claim 3, wherein: a push plate (36) is rotatably arranged in the screening seat (30), ejector rods (37) are arranged on the side wall, close to the first material channel (31), of the push plate (36), the ejector rods (37) are in one-to-one correspondence with first through holes (321), the first through holes (321) are respectively located on the rotating paths of the corresponding ejector rods (37), and the corresponding ejector rods (37) are inserted into the first through holes (321); a push rod (38) is movably arranged on the side wall of the push plate (36) departing from the ejector rod (37), and the other end of the push rod (38) is arranged on the rack (1); the push rod (38) is used for driving the push plate (36) to rotate towards the direction close to or far away from the first material channel (31).

5. The recycled concrete aggregate screening device of claim 4, wherein: a sealing plate (21) for controlling the opening and closing of a discharge hole of the feeding bin (2) is arranged on the feeding bin (2) in a sliding mode, and the sealing plate (21) slides along the swinging direction of the screening seat (30); a connecting rod (22) is arranged between the first material channel (31) and the sealing plate (21), one end of the connecting rod (22) is connected with the sealing plate (21), and the other end of the connecting rod (22) is connected with the first material channel (31).

6. The recycled concrete aggregate screening apparatus of claim 5, wherein: when the closing plate (21) closes the discharge hole of the feeding bin (2), the ejector rod (37) is inserted into the first through hole (321).

7. The recycled concrete aggregate screening apparatus of claim 2, wherein: the number of the third transportation mechanisms (6) is at least two, and the third transportation mechanisms (6) are symmetrically arranged at two sides of the second transportation mechanism (5); the end part of the guide plate (7) inclines towards the direction close to the adjacent third conveying mechanism (6) and is erected on the adjacent third conveying mechanism (6).

8. The recycled concrete aggregate screening apparatus of claim 1, wherein: a buffer plate (71) is arranged on the side wall of the guide plate (7) facing the screening seat (30), and a spring (72) is arranged between the buffer plate (71) and the guide plate (7); one end of the spring (72) is connected with the buffer plate (71), and the other end of the spring (72) is connected with the material guiding plate (7).