Green Construction System for Civil Engineering

Abstract

The present application relates to the technical field of waste treatment, and in particular to a green construction system for civil engineering, which includes a bracket, a rotating ring and a driving unit are provided on the bracket, a plurality of screen cylinders are provided on the surface of the rotating ring, a spiral blade is provided on the inner wall of the screen cylinder, a swing unit is provided inside the innermost screen cylinder and between every two adjacent screen cylinders, a percussion hammer and a magnetic block are provided on the swing unit; an elastic unit is provided on the outer side of each screen cylinder. During the rotation of the screen cylinder, waste of different specifications will be stored in the corresponding screen cylinder, and the screen cylinder will discharge the waste inside it through the spiral blade, thereby realizing the rapid classification and collection of waste of different specifications; when the screen hole of the screen cylinder rotates to the elastic unit, the magnetic block will swing to the elastic unit, and the magnetic block will suck the telescopic end of the elastic unit into the entire row of screen holes, and the telescopic end of the elastic unit will slide in the screen hole, thereby realizing the automatic dredging of the screen cylinder. The present application can improve the screening effect and screening efficiency of waste.

Description

Technical Field

[0001] The present application relates to the technical field of green construction, and in particular to a green construction system for civil engineering. Background Art

[0002] During the construction of municipal engineering, civil engineering and other projects, a large amount of construction waste is usually generated, and most of this construction waste is block waste. In order to achieve green construction, it is usually necessary to crush and screen this part of the waste so that some of the waste can be recycled and reused.

[0003] Through searching, Chinese patent publication number CN116237114A discloses a green construction waste treatment device for civil engineering, which relates to the technical field of construction waste treatment. A green construction waste treatment device for civil engineering, which includes: a crushing device, a dust removal device and a filtering device, the crushing device includes a crushing box and a plurality of crushing wheels, the upper end of the crushing box is provided with a feed inlet, the dust removal device includes a water storage tank and a plurality of spray heads, the above-mentioned spray heads are arranged at the above-mentioned feed inlet, the spray heads are connected to the above-mentioned water storage tank through a water pipeline, the above-mentioned filtering device includes a filter box, the filter box is arranged at the lower end of the above-mentioned crushing box, and the above-mentioned water storage tank is connected to the above-mentioned filter box. A green construction waste treatment device for civil engineering provided in this application can crush and recycle construction waste, and can spray liquid for dust removal during crushing to avoid environmental pollution caused by dust, and at the same time, filter the construction waste after crushing, reuse the dust removal liquid, improve resource utilization, and facilitate the reuse of construction waste.

[0004] With respect to the above-mentioned related technologies, the inventors found the following defects: the waste is crushed only by two crushing wheels, and the crushing method is relatively single, resulting in poor crushing effect and poor screening effect; if the waste comes into contact with water or becomes damp due to weather reasons, the waste is easy to stick together, further affecting the screening effect of the waste, and making the filter holes of the filter plate easy to be blocked. Workers need to stop the machine frequently to clean and maintain the filter plate, which affects the screening efficiency of the waste, and therefore needs to be improved. Summary of the invention

[0005] In order to improve the screening effect and screening efficiency of waste materials, the present application provides a green construction system for civil engineering.

[0006] The green construction system for civil engineering provided by the present application adopts the following technical solution: the green construction system for civil engineering comprises a bracket, a rotating ring and a driving unit for driving the rotating ring to rotate are arranged on the bracket, the rotating ring is arranged horizontally, and a plurality of sieve cylinders are arranged sequentially from the inside to the outside on the surface of the rotating ring, and the sieve cylinders and the rotating ring are arranged coaxially;

[0007] The sieve hole diameter of the inner sieve cylinder is larger than the sieve hole diameter of the outer sieve cylinder, and a spiral leaf is arranged on the inner wall of the sieve cylinder, and the spiral leaf is arranged coaxially with the sieve cylinder;

[0008] A swing unit that can swing left and right is provided inside the innermost screen drum and between every two adjacent screen drums. A percussion hammer and a magnetic block are provided on the swing unit. The percussion hammer is located below the axis of the screen drum.

[0009] Each screen drum is provided with an elastic unit on the outside, and the elastic unit is located above the axis of the screen drum;

[0010] During the rotation of the screen drum, the swing unit will swing left and right on the vertical plane, and the fixed end of the elastic unit will remain stationary;

[0011] When the screen holes of the screen drum rotate to the elastic unit, the magnetic block will swing to the elastic unit, and the magnetic block will suck the telescopic end of the elastic unit into the entire row of screen holes, and the telescopic end of the elastic unit will slide in the screen holes;

[0012] When the magnetic block is away from the elastic unit by a specified distance, the elastic unit will return to its natural state and detach from the sieve hole.

[0013] Optionally, both ends of the sieve hole are provided with inclined guide surfaces, and under the action of the magnetic block, the telescopic end of the elastic unit will enter the sieve hole through one of the guide surfaces and detach from the sieve hole through the other guide surface.

[0014] Optionally, the elastic unit includes an air pipe, all of which are connected to the same air pump, and the air pipe is connected to a plurality of fixed cylinders, in which a top pipe is slidably embedded. The top pipe is connected to the fixed cylinder through a spring, and the top pipe can be adsorbed by a magnetic block and slidably embedded in the sieve hole.

[0015] Optionally, the swing unit includes a fixed frame, the fixed frame is rotatably connected to a connecting frame via a rotating shaft, the percussion hammer and the magnetic block are arranged on the connecting frame, the rotating shaft and the fixed frame are commonly connected to a same torsion spring, the rotating shaft and the screen drum are coaxially arranged, and the rotating shaft is coaxially connected to a first gear;

[0016] The rotating ring is provided with a plurality of racks which are circumferentially arranged around the axis of the screen drum, and every two adjacent racks are arranged at intervals, and the racks can be meshed with the first gear during the rotation process.

[0017] Optionally, the connecting frame is provided with two brushes that can abut against the inner wall of the screen cylinder, and the magnetic block is located between the two brushes.

[0018] Optionally, a material guide cylinder is provided on the outside of the screen cylinder, the material guide cylinder and the screen cylinder are coaxially arranged, the inner wall of the material guide cylinder and the outer wall of the screen cylinder together form a material guide cavity, and the inner diameter of the material guide cylinder gradually decreases from the input end of the screen cylinder to the output end of the screen cylinder.

[0019] Optionally, the material guide cylinder is provided with a plurality of dust holes, a dust collecting cylinder is installed on the bracket, the rotating ring and the outermost screen cylinder are rotatably embedded in the dust collecting cylinder, and a dust collector is installed on the dust collecting cylinder.

[0020] Optionally, a plurality of material guide plates corresponding to the screen drum one by one are installed on the bracket, the material guide plates are arranged at an angle, the high end of the material guide plates is located at the output end of the screen drum, and a collecting box is provided at the lower end of the material guide plates.

[0021] Optionally, a screw conveyor is installed on the bracket, and the output end of the screw conveyor is located inside the innermost screen cylinder.

[0022] In summary, this application includes the following beneficial technical effects:

[0023] 1. During the screening process of waste, the waste in the inner sieve cylinder can pass through the sieve holes and enter the outer sieve cylinder. Waste of different specifications will be temporarily stored in different sieve cylinders and slide into the corresponding collection box through the guide plate, thus realizing the classified collection of waste of different specifications;

[0024] 2. During the waste screening process, the waste will move in a serpentine manner between multiple screen cylinders, which prolongs the screening time of the waste inside each screen cylinder and improves the screening effect of the waste; the dust in the waste can pass through the dust holes and screen holes into the vacuum cleaner, which avoids the dust from escaping into the air as much as possible;

[0025] 3. During the waste screening process, the hammer will cyclically strike the waste located at the bottom wall of the screen drum, so that the waste that sticks together can be separated, and the brush will cyclically brush away the waste attached to the top wall of the screen drum, which minimizes the adhesion of the waste to the screen drum, thereby improving the waste screening effect and making the screen holes of the screen drum less likely to be blocked;

[0026] 4. During the screening process of waste materials, the adsorption force of the magnetic block on the jacking pipe will cause the jacking pipe to be embedded into the sieve hole along one of the guide surfaces and slide in the sieve hole, and then the jacking pipe will be separated from the sieve hole along the other guide surface, realizing the comprehensive cleaning of the inside of the sieve hole;

[0027] 5. Under the action of the air pump, the external air will be pressurized and will pass through the air pipe and the fixed cylinder and sprayed out through the top pipe to the outer wall of the screen cylinder, the screen holes and the brushes, so that the waste attached to the screen cylinder and the brushes and the waste blocked in the screen holes will be blown off, thereby improving the screening effect of the waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application;

[0029] Figure 2 It is a schematic diagram of the structure of the screen drum, the guide plate and the collection box of the embodiment of the present application;

[0030] Figure 3 It is a schematic cross-sectional structure diagram of the overall embodiment of the present application;

[0031] Figure 4 It is a schematic diagram of the cross-sectional structure of the dust collecting cylinder, the material guiding cylinder and the screen cylinder in the embodiment of the present application;

[0032] Figure 5 It is a schematic cross-sectional view of the dust collecting cylinder and the sieve cylinder of the embodiment of the present application;

[0033] Figure 6 It is a schematic cross-sectional structural diagram of the screen drum, the swing unit and the elastic unit in the embodiment of the present application;

[0034] Figure 7 yes Figure 6 A local enlarged schematic diagram of the middle A;

[0035] Figure 8 It is a schematic diagram of the structure of the screen drum, the swing unit and the elastic unit in the embodiment of the present application;

[0036] Fig. 9 yes Figure 8 A local enlarged schematic diagram of point B in the middle.

[0037] 1. Bracket; 11. Guide plate; 12. Collecting box; 13. Guide cylinder; 131. Guide cavity; 132. Dust hole; 14. Dust collecting cylinder; 15. Vacuum cleaner; 2. Screw conveyor; 3. Rotating ring; 31. Rack; 4. Screen cylinder; 41. Screen hole; 42. Guide surface; 43. Spiral blade; 5. Driving unit; 51. Motor; 52. Second gear; 6. Swinging unit; 61. Fixed frame; 62. Rotating shaft; 63. Connecting frame; 64. First gear; 65. Percussion hammer; 66. Brush; 67. Magnetic block; 7. Elastic unit; 71. Air pipe; 72. Air pump; 73. Fixed cylinder; 74. Top pipe; 75. Spring. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-9 This application is described in further detail.

[0039] The present application embodiment discloses a green construction system for civil engineering. Figure 1 As shown, the green construction system for civil engineering includes a support 1, on which a horizontally arranged screw conveyor 2 is installed. The crushed waste will enter the screw conveyor 2 and be spirally conveyed by the screw conveyor 2 to the next process.

[0040] like Figure 2 and Figure 3As shown, a rotating ring 3 is rotatably connected to the bracket 1, and a plurality of screen cylinders 4 are installed on the surface of the rotating ring 3 in sequence from the inside to the outside. The screw conveyor 2, the screen cylinder 4 and the rotating ring 3 are coaxially arranged, and the output end of the screw conveyor 2 is located inside the innermost screen cylinder 4, so that the screw conveyor 2 can transport the crushed waste to the innermost screen cylinder 4.

[0041] like Figure 1 and Figure 3 As shown, a driving unit 5 is provided on the bracket 1, and the driving unit 5 includes a motor 51 installed on the bracket 1, and a second gear 52 is fixedly sleeved on the output shaft of the motor 51 and the rotating ring 3, and the two second gears 52 are meshed with each other, so that the motor 51 can drive the rotating ring 3 to rotate through the two second gears 52, and the rotating ring 3 will drive all the screen drums 4 to rotate.

[0042] like Figure 4 and Figure 5 As shown, the aperture of the sieve hole 41 of the inner sieve drum 4 is larger than the aperture of the sieve hole 41 of the outer sieve drum 4, and a spiral blade 43 is installed on the inner wall of the sieve drum 4, and the spiral blade 43 is coaxially arranged with the sieve drum 4. During the rotation of the sieve drum 4, the spiral blade 43 will push the waste to move from the input end of the sieve drum 4 to the output end of the sieve drum 4, and the waste that meets the specified specification requirements will pass through the sieve hole 41 and fall into the outer sieve drum 4, that is, waste of different specifications will be temporarily stored in different sieve drums 4, and waste that cannot pass through the sieve hole 41 will be discharged through the output end of the sieve drum 4, realizing the rapid classification and collection of waste.

[0043] like Figure 3 and Figure 4 As shown, a plurality of guide plates 11 corresponding to the screen drum 4 are installed on the bracket 1. The guide plates 11 are arranged in an inclined manner. The high end of the guide plates 11 is located at the output end of the screen drum 4. A collection box 12 is arranged at the lower end of the guide plates 11. The waste discharged from the output end of the screen drum 4 will fall into the collection box 12 through the upper surface of the guide plates 11, thereby realizing the classified collection of wastes of different specifications.

[0044] The height of the upper surface of the guide plate 11 gradually decreases from its two sides to its center, so that the waste on the upper surface of the guide plate 11 can be gathered toward the center of the guide plate 11, ensuring that the waste can accurately fall into the collection box 12 and avoiding the waste from sliding off the edge of the guide plate 11 as much as possible.

[0045] A material guide cylinder 13 is installed on the material guide plate 11. The left end of the material guide cylinder 13 is open. The material guide cylinder 13 and the screen cylinder 4 are coaxially arranged. The screen cylinder 4 is rotatably embedded in the material guide cylinder 13. The inner wall of the material guide cylinder 13 and the outer wall of the screen cylinder 4 together form a material guide cavity 131. The left end of the material guide cavity 131 is used for waste discharge. The inner diameter of the material guide cylinder 13 gradually decreases from the input end of the screen cylinder 4 to the output end of the screen cylinder 4.

[0046] During the rotation of the screen drum 4, the waste passing through the screen hole 41 will fall into the material guide cavity 131, and the waste in the material guide cavity 131 will slide obliquely along the bottom cavity wall of the material guide cavity 131 to the input end of the outer screen drum 4, that is, the waste will perform a serpentine motion between multiple screen drums 4, thereby extending the screening time of the waste inside each screen drum 4 and improving the screening effect of the waste.

[0047] A dust collecting cylinder 14 is mounted on the bracket 1 , and the rotating ring 3 and the outermost screen cylinder 4 are rotatably embedded in the dust collecting cylinder 14 , thereby improving the stability of the rotating ring 3 and the screen cylinder 4 during the rotation process.

[0048] The guide barrel 13 is provided with a plurality of dust holes 132, and a dust collector 15 is installed on the dust collecting barrel 14. Under the action of the dust collector 15, dust in the waste material can pass through the dust holes 132 and the sieve holes 41 into the dust collector 15, thus preventing dust from escaping into the air as much as possible.

[0049] like Figure 4 , Figures 6 to 9 As shown, a swing unit 6 that can swing left and right is provided inside the innermost screen drum 4 and between every two adjacent screen drums 4. The swing unit 6 includes a fixed frame 61 installed on the guide plate 11. The fixed frame 61 is rotatably connected to a connecting frame 63 through a rotating shaft 62. The rotating shaft 62 and the fixed frame 61 are commonly connected to the same torsion spring. The rotating shaft 62 is coaxially arranged with the screen drum 4, and a first gear 64 is coaxially connected to the rotating shaft 62. A plurality of racks 31 circumferentially arranged around the axis of the screen drum 4 are installed on the surface of the rotating ring 3, and every two adjacent racks 31 are arranged at intervals.

[0050] During the rotation of the rotating ring 3 and the screen drum 4 , each rack 31 will intermittently mesh with the first gear 64 in sequence, so that the connecting frame 63 will continuously swing left and right inside the screen drum 4 under the dual action of the rack 31 and the torsion spring.

[0051] It is worth noting that a concentric annular groove can be provided on the surface of the rotating ring 3, and the annular groove corresponds to the rotating shaft 62 one by one. The rotating shaft 62 is provided with one end of the first gear 64 which can be rotatably embedded in the annular groove to improve the stability of the rotating shaft 62 during rotation.

[0052] A percussion hammer 65 is installed at the bottom of the connecting frame 63, and the percussion hammer 65 is located below the axis of the screen drum 4. During the left and right swinging process of the connecting frame 63, the percussion hammer 65 will cyclically percuss the waste located at the inner bottom wall of the screen drum 4, so that the waste stuck together can be separated to improve the screening effect of the waste.

[0053] Two brushes 66 are installed on the top of the connecting frame 63, and the brushes 66 are located above the axis of the screen drum 4. During the left and right swinging of the connecting frame 63, the brushes 66 will circulate and brush away the waste materials attached to the top wall of the screen drum 4, thereby reducing the adhesion of the waste materials to the screen drum 4 as much as possible, so as to improve the screening effect of the waste materials and make the screen holes 41 of the screen drum 4 less likely to be blocked.

[0054] Each sieve cylinder 4 is provided with an elastic unit 7 on the outside. The elastic unit 7 is located above the axis of the sieve cylinder 4. The elastic unit 7 includes an air pipe 71 installed on the material guide cylinder 13. All air pipes 71 are connected to the same air pump 72. The air pipe 71 is connected to a plurality of fixed cylinders 73. A top pipe 74 is slidably embedded in the fixed cylinder 73. One end of the top pipe 74 extending into the fixed cylinder 73 is connected to the inner wall of the fixed cylinder 73 through a spring 75.

[0055] Under the action of the air pump 72, the external air will be pressurized and pass through the air pipe 71 and the fixed cylinder 73 and sprayed onto the outer wall of the screen cylinder 4 through the top pipe 74, so that the waste attached to the screen cylinder 4 and the waste blocked in the screen hole 41 are blown off, thereby improving the screening effect of the waste.

[0056] The sieve holes 41 of the sieve drum 4 are arranged in a long strip shape, and both ends of the sieve holes 41 are provided with inclined guide surfaces 42 ; a magnetic block 67 is installed on the top of the connecting frame 63 , and the magnetic block 67 is located between the two brushes 66 . During the rotation of the sieve drum 4, if the sieve hole 41 of the sieve drum 4 rotates to the top pipe 74, the magnetic block 67 has swung to the top pipe 74. At this time, the magnetic block 67 will adsorb the top pipe 74, and the top pipe 74 will gradually extend out of the fixed cylinder 73 and be embedded in the sieve hole 41 along one of the guide surfaces 42. At this time, the top pipe 74 can spray air to the brush 66, thereby blowing off the waste attached to the brush 66 to ensure the cleaning effect of the brush 66 on the waste; during the subsequent rotation of the sieve drum 4, the top pipe 74 will slide in the sieve hole 41 to achieve a comprehensive cleaning of the inside of the sieve hole 41; when the top pipe 74 contacts the other guide surface 42, the magnetic block 67 will no longer adsorb the top pipe 74, and the spring 75 will return to its natural state, so that the top pipe 74 is separated from the sieve hole 41 along the guide surface 42 to ensure the normal rotation of the sieve drum 4.

[0057] The implementation principle of the green construction system for civil engineering in the embodiment of the present application is as follows: during the screening process of waste, the screw conveyor 2 will spirally convey the waste to the innermost screen cylinder 4, the motor 51 will drive the rotating ring 3 to rotate through the two second gears 52, the rotating ring 3 will drive all the screen cylinders 4 to rotate, and the spiral blades 43 will push the waste to move in the screen cylinder 4; the waste located in the inner screen cylinder 4 can pass through the screen hole 41 into the outer screen cylinder 4, and waste of different specifications will be temporarily stored in different screen cylinders 4, and slide into the corresponding collection box 12 through the guide plate 11, thereby realizing the classified collection of waste of different specifications.

[0058] The waste material passing through the sieve hole 41 will fall into the material guide cavity 131, and the waste material in the material guide cavity 131 will slide down along the bottom cavity wall of the material guide cavity 131 to the input end of the outer sieve cylinder 4, that is, the waste material will perform a serpentine motion between the multiple sieve cylinders 4, thereby extending the screening time of the waste material inside each sieve cylinder 4 and improving the screening effect of the waste material; the dust in the waste material can pass through the dust holes 132 and the sieve holes 41 into the dust collector 15, thereby avoiding the dust from escaping into the air as much as possible.

[0059] During the rotation of the rotating ring 3 and the screen drum 4, each rack 31 will intermittently mesh with the first gear 64 in turn, so that the connecting frame 63 will continuously swing left and right inside the screen drum 4 under the dual action of the rack 31 and the torsion spring, and the connecting frame 63 will drive the knocking hammer 65, the brush 66 and the magnetic block 67 to swing synchronously. The knocking hammer 65 will cyclically knock the waste located at the bottom wall of the screen drum 4, so that the waste stuck together can be separated to improve the screening effect of the waste; the brush 66 will cyclically brush away the waste attached to the top wall of the screen drum 4, minimizing the adhesion of the waste to the screen drum 4 to improve the screening effect of the waste and make the screen The sieve holes 41 of the cylinder 4 are not easily blocked; the magnetic block 67 will adsorb the push pipe 74, and the push pipe 74 will be embedded in the sieve holes 41 along one of the guide surfaces 42 and slide in the sieve holes 41, and then the push pipe 74 will be separated from the sieve holes 41 along the other guide surface 42, thereby achieving a comprehensive cleaning of the inside of the sieve holes 41; under the action of the air pump 72, the external air will be pressurized and will pass through the air pipe 71 and the fixed cylinder 73 and be sprayed through the push pipe 74 to the outer wall of the sieve cylinder 4, the sieve holes 41 and the brush 66, so that the waste attached to the sieve cylinder 4 and the brush 66 and the waste blocked in the sieve holes 41 are blown off, thereby improving the screening effect of the waste.

[0060] To sum up, workers only need to transport the crushed waste to the innermost screen drum 4 through the screw conveyor 2. The present application can realize the classified collection of waste, the breaking up of adhered waste, the collection of dust, the cleaning of the sieve holes 41 of the screen drum 4 and the cleaning of the surface of the screen drum 4, thereby improving the screening effect and screening efficiency of the waste.

[0061] 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. Civil engineering green construction system, characterized by: The invention comprises a support (1), the support (1) being provided with a rotating ring (3) and a driving unit (5) for driving the rotating ring (3) to rotate, the rotating ring (3) being arranged horizontally, and a surface of the rotating ring (3) being provided with a plurality of sieve cylinders (4) arranged sequentially from the inside to the outside, the sieve cylinders (4) being arranged coaxially with the rotating ring (3); The sieve holes (41) of the sieve cylinder (4) located on the inner side have a larger aperture than the sieve holes (41) of the sieve cylinder (4) located on the outer side; a spiral leaf (43) is provided on the inner wall of the sieve cylinder (4); the spiral leaf (43) and the sieve cylinder (4) are arranged coaxially; A swing unit (6) capable of swinging left and right is provided inside the innermost screen drum (4) and between every two adjacent screen drums (4), and a striking hammer (65) and a magnetic block (67) are provided on the swing unit (6), and the striking hammer (65) is located below the axis of the screen drum (4); An elastic unit (7) is provided on the outer side of each sieve cylinder (4), and the elastic unit (7) is located above the axis of the sieve cylinder (4); During the rotation of the screen drum (4), the swing unit (6) will swing left and right on the vertical plane, and the fixed end of the elastic unit (7) will remain stationary; When the sieve holes (41) of the sieve drum (4) rotate to the elastic unit (7), the magnetic block (67) will swing to the elastic unit (7), and the magnetic block (67) will suck the telescopic end of the elastic unit (7) into the entire row of sieve holes (41), and the telescopic end of the elastic unit (7) will slide in the sieve holes (41); When the magnetic block (67) moves away from the elastic unit (7) by a specified distance, the elastic unit (7) returns to a natural state and is separated from the sieve hole (41); Both ends of the sieve hole (41) are provided with guide surfaces (42) arranged in an inclined manner, and under the action of the magnetic block (67), the telescopic end of the elastic unit (7) will enter the sieve hole (41) through one of the guide surfaces (42) and will be separated from the sieve hole (41) through the other guide surface (42); The elastic unit (7) comprises an air pipe (71), all of the air pipes (71) are connected to the same air pump (72), the air pipes (71) are connected to a plurality of fixed cylinders (73), a top pipe (74) is slidably embedded in the fixed cylinder (73), the top pipe (74) is connected to the fixed cylinder (73) via a spring (75), and the top pipe (74) can be adsorbed by a magnetic block (67) and slidably embedded in the sieve hole (41); The swing unit (6) comprises a fixed frame (61), the fixed frame (61) is rotatably connected to a connecting frame (63) via a rotating shaft (62), a striking hammer (65) and a magnetic block (67) are arranged on the connecting frame (63), the rotating shaft (62) and the fixed frame (61) are connected to a same torsion spring, the rotating shaft (62) and the screen drum (4) are coaxially arranged, and a first gear (64) is coaxially connected to the rotating shaft (62); The rotating ring (3) is provided with a plurality of racks (31) which are arranged circumferentially around the axis of the screen drum (4), and every two adjacent racks (31) are arranged at intervals, and the racks (31) can mesh with the first gear (64) during rotation; The connecting frame (63) is provided with two brushes (66) capable of contacting the inner wall of the screen cylinder (4), and the magnetic block (67) is located between the two brushes (66).

2. The green construction system for civil engineering according to claim 1, characterized in that: A material guide cylinder (13) is provided on the outside of the sieve cylinder (4), the material guide cylinder (13) and the sieve cylinder (4) are coaxially arranged, the inner wall of the material guide cylinder (13) and the outer wall of the sieve cylinder (4) together enclose a material guide cavity (131), and the inner diameter of the material guide cylinder (13) gradually decreases from the input end of the sieve cylinder (4) to the output end of the sieve cylinder (4).

3. The green construction system for civil engineering according to claim 2, characterized in that: The material guide cylinder (13) is provided with a plurality of dust holes (132), a dust collecting cylinder (14) is mounted on the bracket (1), a rotating ring (3) and a sieve cylinder (4) located at the outermost side are rotatably embedded in the dust collecting cylinder (14), and a dust collector (15) is mounted on the dust collecting cylinder (14).

4. The green construction system for civil engineering according to claim 1, characterized in that: A plurality of guide plates (11) corresponding one to each of the sieve drums (4) are mounted on the support (1). The guide plates (11) are arranged in an inclined manner. The high ends of the guide plates (11) are located at the output ends of the sieve drums (4). A collecting box (12) is provided at the lower ends of the guide plates (11).

5. The green construction system for civil engineering according to claim 1, characterized in that: A screw conveyor (2) is mounted on the support (1), and an output end of the screw conveyor (2) is located inside the innermost screen drum (4).

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