Concrete recycled aggregate particle size screening device

Abstract

The application discloses a concrete recycled aggregate particle size screening device, which comprises a rack, a roller assembly arranged on the rack, and a knocking mechanism arranged on the roller assembly; the rack comprises a rack body, the roller assembly comprises a first roller rotatably arranged on the rack body, and a first sieve hole is arranged on the first roller; a first driving source for driving the first roller to rotate is arranged on the rack body; the knocking mechanism comprises a base and a first knocking assembly; the base is arranged on the rack body; the first knocking assembly comprises a first supporting rod, and a first knocking plate for knocking the first roller is arranged on the first supporting rod. The application can improve the situation that the concrete recycled aggregate is stuck on the sieve hole and causes low screening efficiency.

Description

Technical Field

[0001] This application relates to the technical field of screening devices, and in particular to a particle size screening device for recycled concrete aggregates. Background Technology

[0002] Recycled concrete aggregate is produced by crushing and processing waste concrete to create recycled coarse and fine aggregates, which partially or completely replace natural coarse and fine aggregates in concrete mixes. The aggregates obtained after crushing waste concrete are called recycled aggregates, and these aggregates need to be screened before use.

[0003] Screening devices are generally used when screening concrete. These devices utilize the relative movement of granular materials with the screen surface to separate aggregates into different grades based on particle size. The screening process is usually continuous. After the raw materials are transported to the screening machinery, aggregates smaller than the screen aperture pass through the apertures and are called undersize products; materials larger than the screen aperture continuously exit the screen surface and are called oversize products.

[0004] However, in the screening devices of related technologies, the recycled concrete aggregate is easily stuck in the screen holes when screening, thereby reducing the working efficiency of the screening device. Summary of the Invention

[0005] In order to improve the situation where recycled concrete aggregate gets stuck in the screen holes, resulting in low screening efficiency, this application provides a particle size screening device for recycled concrete aggregate.

[0006] This application provides a particle size screening device for recycled concrete aggregates, which adopts the following technical solution: A particle size screening device for recycled concrete aggregate includes a frame, a roller assembly mounted on the frame, and a striking mechanism mounted on the roller assembly. The frame includes an inclined frame body, the roller assembly includes a first roller, the first roller is rotatably mounted on the frame body, and the first roller has a first screen hole; the frame body is provided with a first drive source, and the first drive source drives the first roller to rotate. The striking mechanism includes a base and a first striking component. The base is disposed on the frame body, and a first slider is slidably disposed on the base. The first slider is provided with a first elastic element for resetting the first slider. The first striking component includes a first support rod disposed on the first slider, and a first striking plate for striking the first roller is disposed on the first support rod. The striking mechanism further includes a triggering component, which includes a first cam for actuating the first slider, the first cam being disposed on the base.

[0007] By adopting the above technical solution, the first drive source drives the first drum to rotate, thereby enabling the first drum to screen the recycled concrete aggregate; when the first cam moves the first slider, it enables the first striking plate to strike the first drum, thereby causing the recycled concrete aggregate stuck on the first screen hole to fall off, and the first elastic element resets the first slider so that the first cam can move the first slider again.

[0008] Optionally, the roller assembly further includes a second roller, the diameter of which is larger than that of the first roller. The second roller is sleeved on the first roller and is rotatably mounted on the frame body. The second roller has a second sieve hole, the diameter of which is smaller than that of the first sieve hole. The frame body is provided with a second drive source, which drives the second roller to rotate.

[0009] By adopting the above technical solution, the second drive source drives the second drum to rotate, and the undersize product of the first drum can enter the second drum. The second drum performs screening again, thereby enabling the step-by-step screening of recycled concrete aggregate.

[0010] Optionally, a second slider is slidably disposed on the base, and a second elastic element for resetting the second slider is disposed on the base; The striking mechanism further includes a second striking component, which includes a second support rod disposed on the second slider and a second striking plate disposed on the second support rod; the first cam moves the second slider so that the second striking plate strikes the second roller.

[0011] By adopting the above technical solution, when the first cam moves the second slider, the second striking plate strikes the second roller, which can cause the recycled concrete aggregate stuck on the second screen hole to fall off, thereby improving the subsequent screening efficiency.

[0012] Optionally, the first support rod and the second support rod are both located between the first roller and the second roller, and multiple first striking plates are provided along the length direction of the first support rod, and the first striking plates correspond to the first screen holes; Multiple second striking plates are provided along the length of the second support rod, and the second striking plates correspond to the second sieve holes.

[0013] By adopting the above technical solution, when the first striking plate strikes the first roller and the second striking plate strikes the second roller, the effect of removing the recycled concrete aggregate stuck in the first and second sieve holes can be improved; at the same time, the inner walls of the first and second rollers can be pressed during the striking process, which can also cause some of the recycled concrete aggregate to fall off.

[0014] Optionally, a fine screen assembly is provided below the second roller. The fine screen assembly includes a fine screen trough, which is disposed on the frame body. A third elastic element is provided between the fine screen trough and the frame body. The fine screen trough has a third screen hole, the diameter of which is smaller than the diameter of the second screen hole. The frame body is also provided with a transmission assembly, which includes a second cam for moving the fine sieve tank relative to it, and the first drive source drives the second cam to rotate.

[0015] By adopting the above technical solution, the undersize product of the second roller falls into the fine screen trough. The first drive source drives the second cam to rotate, and the second cam moves the fine screen trough, so that the fine screen trough screens the recycled concrete aggregate.

[0016] Optionally, the transmission assembly further includes a lever, which is hinged to the fine sieve trough and the middle part of the lever is hinged to the frame body; A fourth elastic element is provided at the end of the lever away from the fine sieve trough, and the fourth elastic element is provided on the frame body; the second cam abuts against the end of the lever away from the fine sieve trough.

[0017] By adopting the above technical solution, when the second cam moves the lever, the lever can drive the fine screening trough to move relative to the screen. The second cam continues to rotate, and the fourth elastic element resets the lever so that the second cam can move the lever again, thereby enabling the fine screening trough to screen the recycled concrete aggregate.

[0018] Optionally, a first transmission rod is rotatably connected to the base, and the first cam is sleeved on the first transmission rod; the first roller is sleeved with a first annular rack, and a gear is sleeved on the first transmission rod, the gear meshing with the first annular rack.

[0019] By adopting the above technical solution, when the first drum rotates, the first ring rack drives the first transmission rod to rotate, thereby causing the first cam to rotate; when the rotational speed of the first drum increases, the striking speed of the first striking plate and the second striking plate also increases accordingly.

[0020] Optionally, a first discharge plate is provided at one end of the first roller, a second discharge plate is provided at one end of the second roller, and a third discharge plate is provided in the fine screening trough.

[0021] By adopting the above technical solution, the oversize product of the first drum is discharged from the first discharge plate, the oversize product of the second drum is discharged from the second discharge plate, and the oversize product of the third drum is discharged from the third discharge plate, thereby enabling the recycled concrete aggregates of different particle sizes to be screened step by step.

[0022] Optionally, a housing is fitted over the second roller, and the housing is mounted on the frame; a shielding cloth is provided on the frame body, and the shielding cloth is connected to the housing.

[0023] By adopting the above technical solutions, the shielding cloth and shell can reduce the splashing of recycled concrete aggregate and allow the recycled concrete aggregate to fall smoothly downwards.

[0024] Optionally, the fine screening assembly further includes a conveyor belt and a third drive source. The conveyor belt is disposed at the bottom of the frame body; the third drive source is disposed on the frame body and drives the conveyor belt to rotate.

[0025] By adopting the above technical solution, the third drive source drives the conveyor belt to rotate, and the undersize product of the fine screening tank falls onto the conveyor belt to transport the undersize product of the fine screening tank.

[0026] In summary, this application includes at least one of the following beneficial effects: 1. The first drum, the second drum, and the fine screening assembly can screen the recycled concrete aggregate step by step and discharge it from the first discharge plate, the second discharge plate, the third discharge plate, and the conveyor belt, respectively. 2. The first cam moves the first slider and the second slider respectively, causing the first striking plate to strike the first roller and the second striking plate to strike the second roller, thereby causing the recycled concrete aggregate stuck in the first screen hole and the second screen hole to fall off. 3. The first drive source drives the second cam to rotate, and the second cam moves the fine screen trough to make relative movement, so that the fine screen trough can screen the recycled concrete aggregate. Attached Figure Description

[0027] Figure 1 This is an overall schematic diagram of the concrete recycled aggregate particle size screening device according to an embodiment of this application; Figure 2 yes Figure 1 A schematic diagram showing the removal of the outer shell and covering cloth; Figure 3 This is a schematic diagram illustrating the first roller in an embodiment of this application; Figure 4 This is a schematic diagram of the striking structure according to an embodiment of this application; Figure 5 yes Figure 3 An enlarged schematic diagram of part A in the middle; Figure 6 This is a schematic diagram illustrating the fine screening component of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Frame body; 12. Support base; 13. Baffle; 14. First support plate; 15. Second support plate; 16. Third support plate; 17. Support rod; 200. Roller assembly; 201. First roller; 2011. First screen hole; 202. Second roller; 2021. Second screen hole; 203. Receiving seat; 2031. First support ring; 2032. Second support ring; 2033. First support rod; 204. Enclosed disc; 205. Feed hopper; 206. Outer shell; 207. First discharge plate; 208. Second discharge plate; 209. First drive source; 210. Second drive source; 211. Reducer; 212. Second ring rack; 3. Striking mechanism; 31. Base; 32. First striking assembly; 321. First slider; 322. First spring; 32 3. First straight rod; 324. First support rod; 325. First support rod; 326. First striking plate; 33. Second striking assembly; 331. Second slider; 332. Second spring; 333. Second straight rod; 334. Second support rod; 335. Second support rod; 336. Second striking plate; 34. Trigger assembly; 341. First ring rack; 342. First transmission rod; 343. First cam; 344. Gear; 4. Fine screen assembly; 41. Fine screen trough; 411. Third screen hole; 42. Third straight rod; 43. Third spring; 44. Third discharge plate; 45. First hinge seat; 46. Shielding cloth; 47. Conveyor belt; 5. Transmission assembly; 51. First bevel gear; 52. Second bevel gear; 53. Second transmission rod; 54. Second cam; 55. Lever; 56. Fourth straight rod; 57. Fourth spring. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0030] This application discloses a particle size screening device for recycled concrete aggregates.

[0031] refer to Figure 1 A concrete recycled aggregate particle size screening device includes a frame 1 and a drum assembly 200. The drum assembly 200 is mounted on the frame 1 and is capable of screening the concrete recycled aggregate.

[0032] refer to Figure 2 The frame 1 includes a frame body 11 and a support base 12. The frame body 11 is a rectangular frame structure and is tilted as a whole. The support base 12 is fixedly connected to the top of the frame body 11. In this embodiment, there are two support bases 12, which are located at both ends of the frame body 11 along its length.

[0033] refer to Figure 2The roller assembly 200 includes a receiving seat 203, which includes a first support ring 2031 and a second support ring 2032. The diameter of the second support ring 2032 is larger than that of the first support ring 2031. The first support ring 2031 and the second support ring 2032 are coaxial, and a plurality of first support rods 2033 are fixedly connected between the first support ring 2031 and the second support ring 2032. The first support ring 2031, the second support ring 2032, and the first support rods 2033 form a set of receiving seats 203. Two sets of receiving seats 203 are provided, and the two sets of receiving seats 203 correspond one-to-one with two support seats 12. The second support ring 2032 is fixedly connected to the support seat 12.

[0034] refer to Figure 2 and Figure 3 A first roller 201 and a second roller 202 are arranged between the two sets of receiving seats 203. The first roller 201 has a first sieve hole 2011, and the second roller 202 has a second sieve hole 2021. The diameter of the first sieve hole 2011 is larger than the diameter of the second sieve hole 2021. The diameter of the second roller 202 is larger than the diameter of the first roller 201. The first roller 201 is rotatably connected to the first support ring 2031, and the second roller 202 is rotatably connected to the second support ring 2032. That is, the first roller 201 and the second roller 202 are coaxial, and both the first roller 201 and the second roller 202 can rotate.

[0035] refer to Figure 2 and Figure 3 For the two sets of receiving seats 203, the set of receiving seats 203 at the higher position is provided with a sealing plate 204. The sealing plate 204 is fixedly connected to the first support ring 2031 and the second support ring 2032 of the set, so as to seal the set of receiving seats 203. A feed hopper 205 is fixedly connected to the sealing plate 204, and the feed hopper 205 is connected to the first roller 201. The other set of receiving seats 203 is provided with a first discharge plate 207 and a second discharge plate 208. The first discharge plate 207 is fixedly connected to the first support ring 2031 of the set and is connected to the first roller 201; the second discharge plate 208 is fixedly connected to the second support ring 2032 of the set and is connected to the second support ring 2032.

[0036] When recycled concrete aggregate is transported to the feed hopper 205, it enters the first drum 201 from the feed hopper 205. The rotation of the first drum 201 will screen the recycled concrete aggregate. Since the frame body 11 is in an inclined state, the product on the screen of the first drum 201 will be discharged from the first discharge plate 207, and the product under the screen of the first drum 201 will fall into the second drum 202 for screening. The product on the screen of the second drum 202 will be discharged from the second discharge plate 208, and the product under the screen of the second drum 202 will fall downwards and enter the subsequent process.

[0037] refer to Figure 3 A first support plate 14 is provided on the frame body 11, and the first support plate 14 is fixedly connected to one end of the frame body 11 near the closed disk 204. A first drive source 209 and a reducer 211 are fixedly connected to the first support plate 14. In this embodiment, the first drive source 209 is a motor. The output shaft of the first drive source 209 is connected to the reducer 211. The output shaft of the reducer 211 passes through the closed disk 204 and is coaxial with and fixedly connected to the first roller 201, so that the first drive source 209 can drive the first roller 201 to rotate.

[0038] refer to Figure 2 A second drive source 210 is provided below the second roller 202. In this embodiment, the second drive source 210 is a motor, and the second drive source 210 is fixedly connected to the support base 12. A second annular rack 212 is sleeved on and fixedly connected to the second roller 202. The output shaft of the second drive source 210 meshes with the second annular rack 212, thereby enabling the second drive source 210 to drive the second roller 202 to rotate.

[0039] refer to Figure 3 and Figure 4 A striking mechanism 3 is provided between the first roller 201 and the second roller 202. The striking mechanism 3 includes a base 31, and there are two bases 31. The two bases 31 correspond one-to-one with the two sets of receiving seats 203. The lower end of the base 31 is fixedly connected to the first support ring 2031, and the upper end of the base 31 is fixedly connected to the second support ring 2032.

[0040] refer to Figure 4 and Figure 5 A first striking component 32 is provided on the base 31. The first striking component 32 includes a first elastic element, which includes a first straight rod 323. The first straight rod 323 is fixedly connected to the base 31, and a first slider 321 is sleeved on the first straight rod 323. The first elastic element also includes a first spring 322, which is sleeved on the first straight rod 323. One end of the first spring 322 is fixedly connected to the lower end of the base 31, and the other end of the first spring 322 is fixedly connected to the first slider 321.

[0041] refer to Figure 5Two first sliders 321 are provided, each corresponding to one of the two bases 31. A first support rod 324 is fixedly connected between the two first sliders 321. A first support rod 325 is fixedly connected to the first support rod 324. A first striking plate 326 is fixedly connected to the first support rod 325. Multiple first striking plates 326 are provided along the length of the first support rod 324, and each first striking plate 326 corresponds to a first screen hole 2011. The first striking plates 326 are bent and can fit against the first roller 201.

[0042] refer to Figure 5 The base 31 is also provided with a second striking component 33, which includes a second elastic element, which includes a second straight rod 333. The second straight rod 333 is fixedly connected to the base 31 and is parallel to the first straight rod 323. A second slider 331 and a second spring 332 are sleeved on the second straight rod 333. One end of the second spring 332 is fixedly connected to the top wall of the base 31, and the other end of the second spring 332 is fixedly connected to the second slider 331.

[0043] refer to Figure 5 Two second sliders 331 are provided, each corresponding to one of the two bases 31. A second support rod 334 is fixedly connected between the two second sliders 331. A second support rod 335 is fixedly connected to the second support rod 334, and a second striking plate 336 is fixedly connected to the second support rod 335. Multiple second striking plates 336 are provided along the length of the second support rod 334, and each second striking plate 336 corresponds to the second screen hole 2021. The second striking plates 336 are bent so that they can fit against the second roller 202.

[0044] refer to Figure 5 The striking mechanism 3 also includes a trigger assembly 34, which includes a first annular rack 341, which is sleeved and fixedly connected to the first roller 201. The trigger assembly 34 also includes a first transmission rod 342, whose two ends are rotatably connected to the base 31. A gear 344 is sleeved and fixedly connected to the first transmission rod 342, and the gear 344 meshes with the first annular rack 341. A protrusion is integrally formed on the first slider 321, and a protrusion is also integrally formed on the second slider 331. A first cam 343 is sleeved and fixedly connected to the first transmission rod 342, and the first cam 343 can abut against the protrusions on the first slider 321 and the second slider 331 respectively, thereby causing the first slider 321 and the second slider 331 to move.

[0045] When the first roller 201 rotates, it drives the first annular rack 341 to rotate, which in turn drives the first cam 343 to rotate through the first transmission rod 342. The first cam 343 can push the first slider 321 to move upward. The first spring 322 resets the first slider 321. Under the action of inertia, the first striking plate 326 strikes the first roller 201, thereby causing the recycled concrete aggregate stuck on the first screen hole 2011 to fall off. The first cam 343 can move the second slider 331 downward, and the second spring 332 can reset the second slider 331. Under the action of inertia, the second striking plate 336 strikes the second roller 202, thereby causing the recycled concrete aggregate stuck on the second screen hole 2021 to fall off.

[0046] refer to Figure 2 Below the second roller 202, a fine screening assembly 4 is provided. The fine screening assembly 4 includes a fine screening trough 41, which is a rectangular trough. A third discharge plate 44 is provided at one end of the fine screening trough 41, and the third discharge plate 44 is on the same side as the first discharge plate 207 and the second discharge plate 208. A third screen hole 411 is provided on the bottom wall and the side wall along the length direction of the fine screening trough 41. The diameter of the third screen hole 411 is smaller than that of the second screen hole 2021.

[0047] refer to Figure 6 A third elastic element is provided on the fine screening tank 41. The third elastic element includes a third straight rod 42, which is fixedly connected to the fine screening tank 41 and passes through the frame body 11. A third spring 43 is sleeved on the third straight rod 42. One end of the third spring 43 is fixedly connected to the fine screening tank 41, and the other end of the third spring 43 is fixedly connected to the frame body 11. In this embodiment, four third elastic elements are provided, respectively located near the four corners of the fine screening tank 41.

[0048] refer to Figure 3 The frame body 11 is equipped with a transmission assembly 5, which includes a first bevel gear 51, which is sleeved and fixedly connected to the output shaft of the first drive source 209. A second support plate 15 and a third support plate 16 are fixedly connected to the frame body 11, and the first support plate 14, second support plate 15, and third support plate 16 are parallel to each other. The transmission assembly 5 also includes a second transmission rod 53, which passes through the second support plate 15 and the third support plate 16, and is rotatably connected to the second support plate 15 and the third support plate 16 respectively via bearings (not shown in the figure).

[0049] refer to Figure 3A second bevel gear 52 is inserted and fixedly connected to the end of the second transmission rod 53 near the first drive source 209, and the second bevel gear 52 meshes with the first bevel gear 51. A second cam 54 is inserted and fixedly connected to the end of the second transmission rod 53 away from the second bevel gear 52.

[0050] refer to Figure 3 A lever 55 is hinged to the side of the fine screening tank 41 near the second cam 54. The middle part of the lever 55 along its length is hinged to the frame body 11. The lever 55 can rotate around the hinge axis, and the end of the lever 55 away from the fine screening tank 41 can abut against the second cam 54. A fourth elastic element is provided on the frame body 11. The fourth elastic element includes a fourth straight rod 56, which is hinged to the end of the lever 55 away from the fine screening tank 41 and passes through the frame body 11. The fourth elastic element includes a fourth spring 57, which is sleeved on the fourth straight rod 56. One end of the fourth spring 57 is fixedly connected to the lever 55, and the other end of the fourth spring 57 is fixedly connected to the frame body 11.

[0051] When the first drive source 209 drives the second transmission rod 53 to rotate, it can drive the second cam 54 to rotate, thereby enabling the second cam 54 to move the lever 55. The second elastic element can reset the lever 55, thereby causing the fine screen trough 41 to shake and vibrate. The recycled concrete aggregate can be screened from the bottom and both sides in the length direction of the fine screen trough 41, and the oversize product of the fine screen trough 41 is discharged from the third discharge plate 44.

[0052] refer to Figure 1 and Figure 2 A conveyor belt 47 is installed at the lower end of the frame body 11. A third drive source (not shown in the figure) is also installed on the frame body 11. The third drive source drives the conveyor belt 47 to operate, and the undersize product of the fine screening trough 41 is transported by the conveyor belt 47. A housing 206 is installed above the second roller 202, and the housing 206 is fixedly connected to the second support ring 2032. A shielding cloth 46 is installed on the fine screening trough 41. One end of the shielding cloth 46 is fixedly connected to the housing 206, and the other end of the shielding cloth 46 is fixedly connected to the upper end of the fine screening trough 41, sealing the space between the second roller 202 and the fine screening trough 41, so that the undersize product of the second roller 202 falls into the fine screening trough 41. A baffle 13 is fixedly connected along the length of the frame body 11. The baffle 13 allows the screened recycled concrete aggregate to fall from both sides of the fine screening trough 41 onto the conveyor belt 47 along the length of the frame body 11.

[0053] The implementation principle of the concrete recycled aggregate particle size screening device in this application embodiment is as follows: the concrete recycled aggregate enters the first drum 201 from the feed hopper 205. The first drive source 209 drives the first drum 201 to rotate. Due to the overall tilt of the frame body 11, the oversize product of the first drum 201 is discharged from the first discharge plate 207, and the undersize product of the first drum 201 falls into the second drum 202. The second drive source 210 drives the second drum 202 to rotate. The oversize product of the second drum 202 is discharged from the second discharge plate 208, and the undersize product of the second drum 202 falls into the fine screen trough 41. The first drive source 209 drives the second cam 54 to vibrate the fine screen trough 41. The oversize product of the fine screen trough 41 is discharged from the third discharge plate 44, and the undersize product of the fine screen trough 41 falls onto the conveyor belt 47 and is transported by the conveyor belt 47. The first annular rack 341 drives the first cam 343 to rotate, thereby actuating the first slider 321 and the second slider 331, causing the first striking plate 326 to strike the first roller 201 and the second striking plate 336 to strike the second roller 202, thereby causing the recycled concrete aggregate stuck in the first screen hole 2011 and the second screen hole 2021 to fall off, which can improve the screening efficiency.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A particle size screening device for recycled concrete aggregate, characterized in that: It includes a frame (1), a roller assembly (200) disposed on the frame (1), and a striking mechanism (3) disposed on the roller assembly (200); The frame (1) includes an inclined frame body (11), and the roller assembly (200) includes a first roller (201), which is rotatably mounted on the frame body (11). The first roller (201) has a first screen hole (2011). The frame body (11) is provided with a first drive source (209), which drives the first roller (201) to rotate. The striking mechanism (3) includes a base (31) and a first striking component (32). The base (31) is disposed on the frame body (11). A first slider (321) is slidably disposed on the base (31). The first slider (321) is provided with a first elastic element for resetting the first slider (321). The first striking component (32) includes a first support rod (324) disposed on the first slider (321). A first striking plate (326) for striking the first roller (201) is disposed on the first support rod (324). The striking mechanism (3) further includes a trigger component (34), which includes a first cam (343) for actuating the first slider (321), and the first cam (343) is disposed on the base (31); The roller assembly (200) further includes a second roller (202), the diameter of which is larger than that of the first roller (201). The second roller (202) is sleeved on the first roller (201) and is rotatably mounted on the frame body (11). The second roller (202) has a second sieve hole (2021), the diameter of which is smaller than that of the first sieve hole (2011). A second drive source (210) is provided on the frame body (11), and the second drive source (210) drives the second roller (202) to rotate; A second slider (331) is slidably disposed on the base (31), and a second elastic element is disposed on the base (31) for resetting the second slider (331); The striking mechanism (3) further includes a second striking component (33), which includes a second support rod (334) disposed on the second slider (331) and a second striking plate (336) disposed on the second support rod (334); the first cam (343) moves the second slider (331) so that the second striking plate (336) strikes the second roller (202); The first support rod (324) and the second support rod (334) are both located between the first roller (201) and the second roller (202). Multiple first striking plates (326) are arranged along the length direction of the first support rod (324), and the first striking plates (326) correspond to the first sieve hole (2011). Multiple second striking plates (336) are provided along the length direction of the second support rod (334), and the second striking plates (336) correspond to the second sieve holes (2021).

2. The concrete recycled aggregate particle size screening device according to claim 1, characterized in that: A fine screen assembly (4) is provided below the second roller (202). The fine screen assembly (4) includes a fine screen trough (41), which is disposed on the frame body (11). A third elastic member is provided between the fine screen trough (41) and the frame body (11). The fine screen trough (41) has a third screen hole (411), and the diameter of the third screen hole (411) is smaller than the diameter of the second screen hole (2021). The frame body (11) is also provided with a transmission assembly (5), which includes a second cam (54) for moving the fine sieve trough (41) relative to it. The first drive source (209) drives the second cam (54) to rotate.

3. The particle size screening device for recycled concrete aggregate according to claim 2, characterized in that: The transmission assembly (5) also includes a lever (55), which is hinged to the fine sieve tank (41) and the middle part of the lever (55) is hinged to the frame body (11). The lever (55) is provided with a fourth elastic element at the end away from the fine sieve tank (41), and the fourth elastic element is provided on the frame body (11); the second cam (54) abuts against the end of the lever (55) away from the fine sieve tank (41).

4. The concrete recycled aggregate particle size screening device according to claim 1, characterized in that: The base (31) is rotatably connected to a first transmission rod (342), and the first cam (343) is sleeved on the first transmission rod (342); the first roller (201) is sleeved with a first annular rack (341), and the first transmission rod (342) is sleeved with a gear (344), which meshes with the first annular rack (341).

5. A particle size screening device for recycled concrete aggregate according to claim 2, characterized in that: The first roller (201) is provided with a first discharge plate (207) at one end, the second roller (202) is provided with a second discharge plate (208) at one end, and the fine screen trough (41) is provided with a third discharge plate (44).

6. The particle size screening device for recycled concrete aggregate according to claim 2, characterized in that: The second roller (202) is fitted with a shell (206) on top, and the shell (206) is mounted on the frame (1); a shielding cloth (46) is mounted on the frame body (11), and the shielding cloth (46) is connected to the shell (206).

7. The particle size screening device for recycled concrete aggregate according to claim 2, characterized in that: The fine screening assembly (4) also includes a conveyor belt (47) and a third drive source. The conveyor belt (47) is located at the bottom of the frame body (11). The third drive source is located on the frame body (11) and drives the conveyor belt (47) to rotate.

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