Fine sand screening device for building

Abstract

The utility model relates to a building gravel screening device, in particular to a fine sand screening device for building. According to the gravel screening device, large-size gravel or impurities in gravel are reserved on the coarse screen through the arrangement of the coarse screen, so that stable filtering of the fine screen is guaranteed, screening and filtering work of fine sand is achieved through the arrangement of the fine screen, and it is guaranteed that no material is stacked on the fine screen through the arrangement of the rotating shaft and the sand pushing assembly; the vibrating column, the connecting seat and the knocking plate are arranged to vibrate the coarse screen, so that fine sand can smoothly pass through the coarse screen, automatic fine sand screening work is achieved, manual sand screening work is not needed, the labor intensity of workers is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a screening device for building sand and gravel, specifically a screening device for fine sand used in construction. Background Technology

[0002] Sand and gravel are widely used as building materials or concrete raw materials in housing, roads, highways, railways and engineering projects. Depending on the construction requirements, the requirements for sand and gravel in the construction process are also different. Some require coarser sand and gravel, while others require finer sand and gravel. Therefore, it is necessary to use a screening device to screen the sand and gravel before use.

[0003] Fine sand is mainly used in the construction field for concrete preparation, mortar production, or as filler. In the current technology, fine sand screening is generally done manually using sieves and shovels, which is labor-intensive and inefficient. Utility Model Content

[0004] The purpose of this invention is to provide a fine sand screening device for construction, which can realize automatic fine sand screening, reduce the labor intensity of personnel, and improve work efficiency.

[0005] This utility model discloses a fine sand screening device for construction, comprising a sand screening cylinder, which includes a straight cylinder and a funnel cylinder, the straight cylinder and the funnel cylinder being connected. The upper end of the funnel cylinder is fixedly connected to the lower end of the straight cylinder, the inner diameter of the upper end of the funnel cylinder is larger than the inner diameter of the lower end of the funnel cylinder, the straight cylinder and the funnel cylinder are coaxial, the inner diameter of the upper end of the funnel cylinder is the same as the inner diameter of the straight cylinder, a fine screen is fixedly connected inside the straight cylinder, and multiple columns are fixedly connected to the top surface of the sand screening cylinder, the lower ends of the multiple columns are all fixedly connected to the top surface of the straight cylinder, the multiple columns are evenly distributed circumferentially around the axis of the straight cylinder, and a top surface is fixedly connected to the top surface of the multiple columns. A support platform is provided, with a motor fixedly connected to the top surface of the support platform. The output shaft of the motor passes through the top support platform and extends out of the lower end of the top support platform. A rotating shaft is fixedly connected to the lower end of the rotating shaft via a coupling. The rotating shaft is coaxial with the straight cylinder. A sand-pushing assembly is fixedly connected to the lower end of the rotating shaft. The sand-pushing assembly is rotatably connected to the top surface of the fine screen. The sand-pushing assembly includes a fixed tube and baffles. The fixed tube is fixedly connected to the lower end of the rotating shaft and is coaxial with the rotating shaft. The baffles are fixedly connected to the outer wall of the fixed tube. Multiple baffles are provided and are evenly distributed around the central axis of the fixed tube.

[0006] Furthermore, the fixed tube has a threaded hole I at the center of its top surface, and the rotating shaft has an external thread on its lower outer wall. The external thread is connected to the threaded hole I. The fixed tube has a threaded hole II on its side wall. The threaded hole II penetrates one side wall of the fixed tube, and a set screw is connected inside the threaded hole II. The front end of the set screw is engaged with the external thread.

[0007] Furthermore, a hydraulic cylinder is fixedly connected to the bottom surface of the support platform. The piston rod of the hydraulic cylinder faces the straight cylinder. A coarse screen is slidably connected inside the straight cylinder. The coarse screen is located above the fine screen and is coaxial with the straight cylinder. The outer diameter of the coarse screen is slightly smaller than the inner diameter of the straight cylinder. A connecting pipe is fixedly connected to the top surface of the coarse screen. The front end of the hydraulic cylinder piston rod is inserted into the connecting pipe. The hydraulic cylinder and the connecting pipe are connected by bolts and nuts. Both the hydraulic cylinder and the connecting pipe are provided with holes for bolts to pass through. After the bolt passes through the hydraulic cylinder and the connecting pipe, the nut is connected.

[0008] Furthermore, the hydraulic cylinders are provided in multiples, and the multiple hydraulic cylinders are evenly distributed around the axis of rotation. The connecting pipes are provided in multiples, and the number of connecting pipes is the same as the number of hydraulic cylinders. The piston rods of the multiple hydraulic cylinders are inserted into the multiple connecting pipes one by one. The multiple hydraulic cylinders and the multiple connecting pipes are connected by bolts and nuts.

[0009] Furthermore, the coarse screen has a central hole in the center, and a central tube is fixedly connected inside the central hole. The central tube is coaxial with the coarse screen, and both ends of the central tube extend out of the coarse screen. The inner diameter of the central tube is larger than the outer diameter of the rotating shaft, and the central tube is slidably connected to the outside of the rotating shaft.

[0010] Furthermore, a vibrating column is fixedly connected to the bottom surface of the coarse screen, and a connecting seat is fixedly connected to the outer wall of the rotating shaft. The connecting seat is located below the coarse screen, and a groove is provided on the side wall of the connecting seat away from the rotating shaft. A striking plate is inserted into the groove and contacts the vibrating column. The striking plate and the connecting seat are connected by bolts and nuts. Both the striking plate and the connecting seat are provided with holes for the bolts to pass through. After the bolts pass through the striking plate and the connecting seat, the nuts are connected.

[0011] Furthermore, the vibrating column includes a top seat, a lower column, and a spring. The top surface of the top seat is fixedly connected to the bottom surface of the coarse screen, and the bottom surface of the top seat has an inner hole I. The lower column is located below the top seat, and the top surface of the lower column has an inner hole II. The two ends of the spring are fixedly connected to the inner hole I and the inner hole II, respectively. The striking plate contacts the outer wall of the lower column. There are multiple vibrating columns, which are evenly distributed around the axis of rotation. There are also multiple connecting seats, which are evenly distributed around the axis of rotation. Each connecting seat is connected to a striking plate. The lower column is made of rubber. The striking plate is made of rubber.

[0012] Furthermore, the outer diameter of the piston rod of the hydraulic cylinder is smaller than the inner diameter of the connecting pipe, and there is a gap between the bottom surface of the hydraulic cylinder and the top surface of the coarse screen.

[0013] Furthermore, a feeding valve is fixedly connected to the lower end of the funnel cylinder, and a feeding pipe is fixedly connected to the end of the feeding valve away from the funnel cylinder.

[0014] Furthermore, the lower part of the sand screening cylinder is fixedly connected to a support leg, the lower end of the support leg is fixedly connected to a caster, and the lower part of the support leg is fixedly connected to a counterweight.

[0015] The beneficial effects of this utility model are as follows: By setting a coarse screen, this utility model retains larger sand particles or impurities in the sand and gravel on the coarse screen, thereby ensuring stable filtration by the fine screen. The fine screen enables the screening of fine sand. The rotating shaft and sand pushing assembly ensure that no material accumulates on the fine screen. The vibrating column, connecting seat, and striking plate vibrate the coarse screen, thereby ensuring that fine sand passes smoothly through the coarse screen. This utility model realizes automatic screening of fine sand, eliminating the need for manual sand screening, reducing labor intensity, and improving work efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This utility model Figure 1 AA section view;

[0018] Figure 3 This is a partial structural diagram of the coarse screen section of this utility model;

[0019] Figure 4 This utility model Figure 3 BB section view;

[0020] Figure 5 This is a partial structural diagram of the vibration column of this utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the fine screen of this utility model;

[0022] Figure 7 This utility model Figure 6 CC section view;

[0023] Figure 8 This is a schematic diagram of the structure of the coarse screen of this utility model when it is raised.

[0024] In the diagram: 1. Sand screening cylinder; 101. Straight cylinder; 102. Funnel cylinder; 2. Column; 3. Top support platform; 4. Motor; 5. Support leg; 6. Discharge valve; 7. Discharge pipe; 8. Counterweight; 9. Hydraulic cylinder; 10. Rotating shaft; 1001. External thread; 11. Coarse screen; 1101. Center hole; 12. Fine screen; 13. Center tube; 14. Connecting tube; 15. Vibrating column; 1501. Top seat; 1502. Inner hole I; 1503. Lower column; 1504. Inner hole II; 1505. Spring; 16. Connecting seat; 1601. Groove; 17. Striking plate; 18. Sand pushing assembly; 1801. Fixed tube; 1802. Stop bar; 1803. Threaded hole I; 1804. Threaded hole II. Detailed Implementation

[0025] like Figures 1-8 As shown, this utility model discloses a fine sand screening device for construction, comprising a sand screening cylinder 1, which includes a straight cylinder 101 and a funnel cylinder 102, which are connected. The upper end of the funnel cylinder 102 is fixedly connected to the lower end of the straight cylinder 101, and the inner diameter of the upper end of the funnel cylinder 102 is larger than the inner diameter of the lower end of the funnel cylinder 102. The straight cylinder 101 and the funnel cylinder 102 are coaxial, and the inner diameter of the upper end of the funnel cylinder 102 is the same as the inner diameter of the straight cylinder 101. A fine screen 12 is fixedly connected inside the straight cylinder 101. Multiple columns 2 are fixedly connected to the top surface of the sand screening cylinder 1, and the lower ends of the multiple columns 2 are all fixedly connected to the top surface of the straight cylinder 101. The multiple columns 2 are evenly distributed around the axis of the straight cylinder 101, and a top support platform is fixedly connected to the top surface of the multiple columns 2. 3. A motor 4 is fixedly connected to the top surface of the top support platform 3. The output shaft of the motor 4 passes through the top support platform 3. The output of the motor 4 extends out of the lower end of the top support platform 3 and is fixedly connected to a rotating shaft 10 via a coupling. The rotating shaft 10 is coaxial with the straight cylinder 101. A sand pushing assembly 18 is fixedly connected to the lower end of the rotating shaft 10. The sand pushing assembly 18 is rotatably connected to the top surface of the fine screen 12. The sand pushing assembly 18 includes a fixed tube 1801 and baffles 1802. The fixed tube 1801 is fixedly connected to the lower end of the rotating shaft 10 and is coaxial with the rotating shaft 10. The baffles 1802 are fixedly connected to the outer wall of the fixed tube 1801. Multiple baffles 1802 are provided and are evenly distributed around the axis of the fixed tube 1801.

[0026] When in use, sand and gravel are added from the upper port of the sand screening cylinder 1. The motor 4 is started, and the motor 4 drives the rotating shaft 10 to rotate. The rotating shaft 10 drives the sand pushing assembly 18 to rotate. The baffle 1802 pushes the sand and gravel to move on the fine screen 12. The fine sand is filtered through the fine screen 12 into the funnel cylinder 102, thereby realizing the screening of fine sand. The sand pushing assembly 18 is set to prevent fine sand from accumulating on the fine screen 12 and ensure that the fine sand is filtered down smoothly.

[0027] The fixed tube 1801 has a threaded hole I 1803 at the center of its top surface. The rotating shaft 10 has an external thread 1001 on its lower outer wall. The external thread 1001 is connected to the threaded hole I 1803. The fixed tube 1801 has a threaded hole II 1804 on its side wall. The threaded hole II 1804 penetrates one side wall of the fixed tube 1801. A set screw is connected in the threaded hole II 1804. The front end of the set screw is engaged with the external thread 1001.

[0028] The fixed tube 1801 is connected to the external thread 1001 at the lower part of the rotating shaft 10 through the threaded hole I 1803, and the connection between the fixed tube 1801 and the rotating shaft 10 is locked by the set screw to prevent the sand pushing assembly 18 from falling off as the rotating shaft 10 rotates. The sand pushing assembly 18 is detachable so that it can be easily replaced after damage. It should be noted that in this embodiment, the end of the baffle 1802 away from the fixed tube 1801 is set as an arc to prevent foreign objects from getting stuck between the end of the baffle 1802 and the inner wall of the straight cylinder 101.

[0029] However, larger sand particles or impurities in the gravel may remain on the fine screen 12, which may affect the rotation of the baffle 1802. Excessive retention of sand particles or impurities will also affect the screening of fine sand. To solve this technical problem, a hydraulic cylinder 9 is fixedly connected to the bottom surface of the support platform 3. The piston rod of the hydraulic cylinder 9 faces the straight cylinder 101. A coarse screen 11 is slidably connected inside the straight cylinder 101. The coarse screen 11 is located above the fine screen 12 and is coaxial with the straight cylinder 101. The outer diameter of the coarse screen 11 is slightly smaller than the inner diameter of the straight cylinder 101. A connecting pipe 14 is fixedly connected to the top surface of the coarse screen 11. The front end of the piston rod of the hydraulic cylinder 9 is inserted into the connecting pipe 14. The hydraulic cylinder 9 and the connecting pipe 14 are connected by a screw. The hydraulic cylinder 9 and the connecting pipe 14 are both provided with holes for bolts to pass through. After the bolt passes through the hydraulic cylinder 9 and the connecting pipe 14, the nut is connected. A vibrating column 15 is fixedly connected to the bottom surface of the coarse screen 11. A connecting seat 16 is fixedly connected to the outer wall of the rotating shaft 10. The connecting seat 16 is located below the coarse screen 11. A groove 1601 is provided on the side wall of the connecting seat 16 away from the rotating shaft 10. A striking plate 17 is inserted into the groove 1601 and contacts the vibrating column 15. The striking plate 17 and the connecting seat 16 are connected by bolts and nuts. Both the striking plate 17 and the connecting seat 16 are provided with holes for bolts to pass through. After the bolt passes through the striking plate 17 and the connecting seat 16, the nut is connected.

[0030] The coarse screen 11 is used to retain larger sand and gravel or impurities on the screen, while fine sand can fall through the coarse screen 11 to the fine screen 12 for subsequent processing, thus preventing sand and gravel from accumulating on the coarse screen 11. This invention uses a rotating shaft 10 to drive the connecting seat 16 and the striking plate 17 to rotate. During the rotation of the striking plate 17, it continuously contacts the vibrating column 15, thereby causing the coarse screen 11 to vibrate, ensuring that fine sand can fall smoothly through the coarse screen 11 and preventing material accumulation on the screen 11. When there is no need to vibrate the coarse screen 11, the hydraulic cylinder 9 is operated to lift the coarse screen 11. After the coarse screen 11 is lifted, the striking plate 17 will no longer strike the vibrating column 15. After the coarse screen 11 is lifted to the end of the sand screening cylinder 1, it is also convenient to clean the sand and gravel remaining on the coarse screen 11.

[0031] Multiple hydraulic cylinders 9 are provided, and the multiple hydraulic cylinders 9 are evenly distributed around the axis of the rotating shaft 10. Multiple connecting pipes 14 are provided, and the number of multiple connecting pipes 14 is the same as the number of multiple hydraulic cylinders 9. The piston rods of the multiple hydraulic cylinders 9 are inserted into the multiple connecting pipes 14 one by one. The multiple hydraulic cylinders 9 and the multiple connecting pipes 14 are all connected by bolts and nuts.

[0032] The arrangement of multiple hydraulic cylinders 9 and multiple connecting pipes 14 ensures the stability of the lifting and lowering of the coarse screen 11. In this embodiment, four hydraulic cylinders 9 and four connecting pipes 14 are provided. Under normal circumstances, in order to ensure the stability of the lifting and lowering of the coarse screen 11, at least four hydraulic cylinders 9 should be symmetrically arranged.

[0033] The coarse screen 11 has a central hole 1101 in the center, and a central tube 13 is fixedly connected inside the central hole 1101. The central tube 13 is coaxial with the coarse screen 11, and both the upper and lower ends of the central tube 13 extend out of the coarse screen 11. The inner diameter of the central tube 13 is larger than the outer diameter of the rotating shaft 10, and the central tube 13 is slidably connected to the outside of the rotating shaft 10.

[0034] The central tube 13 ensures that the rotating shaft 10 rotates stably within the central tube 13, without affecting the lifting and lowering of the coarse screen 11.

[0035] The vibrating column 15 includes a top seat 1501, a lower column 1503, and a spring 1505. The top surface of the top seat 1501 is fixedly connected to the bottom surface of the coarse screen 11. The bottom surface of the top seat 1501 has an inner hole I 1502. The lower column 1503 is located below the top seat 1501. The top surface of the lower column 1503 has an inner hole II 1504. The two ends of the spring 1505 are fixedly connected to the inner holes I 1502 and II 1504, respectively. The striking plate 17 contacts the outer wall of the lower column 1503. There are multiple vibrating columns 15, which are evenly distributed around the axis of the rotating shaft 10. There are multiple connecting seats 16, which are evenly distributed around the axis of the rotating shaft 10. Each connecting seat 16 is connected to a striking plate 17. The lower column 1503 is made of rubber. The striking plate 17 is also made of rubber.

[0036] The vibration column 15 ensures the vibration effect on the coarse screen 11 through the arrangement of the top seat 1501, the lower column 1503 and the spring 1505. After the striking plate 17 strikes the lower column 1503 and disengages from the striking plate 17, the spring 1505 will move with the lower column 1503 and generate a swaying motion, thereby achieving the vibration effect on the coarse screen 11.

[0037] Since the coarse screen 11 will vibrate, the outer diameter of the piston rod of the hydraulic cylinder 9 is smaller than the inner diameter of the connecting pipe 14. There is a gap between the bottom surface of the hydraulic cylinder 9 and the top surface of the coarse screen 11. The setting of the gap between the bottom surface of the hydraulic cylinder 9 and the top surface of the coarse screen 11 and the gap between the piston rod of the hydraulic cylinder 9 and the inner diameter of the connecting pipe 14 can meet the vibration and shaking of the coarse screen 11 and avoid the coarse screen 11 driving the hydraulic cylinder 9 to shake excessively.

[0038] A discharge valve 6 is fixedly connected to the lower end of the funnel cylinder 102, and a discharge pipe 7 is fixedly connected to the end of the discharge valve 6 away from the funnel cylinder 102.

[0039] The discharge valve 6 and discharge pipe 7 are designed to facilitate the collection of fine sand after filtration.

[0040] The lower part of the sand screening cylinder 1 is fixedly connected to a support leg 5, the lower end of the support leg 5 is fixedly connected to a caster, and the lower part of the support leg 5 is fixedly connected to a counterweight 8.

[0041] The support legs 5 provide support for the utility model, the casters facilitate the movement of the utility model, and the counterweight 8 prevents the utility model from tipping over due to excessive center height.

[0042] In this embodiment, the top support platform 3 includes a rectangular frame formed by welding channel steel. Steel plates are welded to the top and bottom surfaces of the rectangular frame. A through hole is opened at the center of the two steel plates and a central support pipe is welded thereon. A bearing is also provided between the output shaft of the motor 4 and the central support pipe to ensure the smooth rotation of the output shaft of the motor 4. The use of bearings and bearing retaining rings and related accessories is a technique frequently used by those skilled in the art, and will not be described in detail here.

[0043] This invention utilizes a coarse screen 11 to retain larger sand particles or impurities, thus ensuring stable filtration by the fine screen 12. The fine screen 12 facilitates fine sand filtration. The rotating shaft 10 and the sand-pushing assembly 18 prevent material buildup on the fine screen 12. The vibrating column 15, connecting seat 16, and striking plate 17 vibrate the coarse screen 11, ensuring smooth passage of fine sand. This invention achieves automatic fine sand screening, eliminating the need for manual screening, reducing labor intensity, and improving work efficiency.

Claims

1. A fine sand screening device for construction, characterized in that: The system includes a sand screening cylinder (1), which comprises a straight cylinder (101) and a funnel cylinder (102). The straight cylinder (101) and the funnel cylinder (102) are connected. The upper end of the funnel cylinder (102) is fixedly connected to the lower end of the straight cylinder (101). The inner diameter of the upper end of the funnel cylinder (102) is larger than the inner diameter of the lower end of the funnel cylinder (102). The straight cylinder (101) and the funnel cylinder (102) are coaxial. The inner diameter of the upper end of the funnel cylinder (102) is... The straight cylinder (101) has the same inner diameter. A fine screen (12) is fixedly connected inside the straight cylinder (101). Multiple columns (2) are fixedly connected to the top surface of the sand screening cylinder (1). The lower ends of the multiple columns (2) are all fixedly connected to the top surface of the straight cylinder (101). The multiple columns (2) are evenly distributed around the axis of the straight cylinder (101). A top support platform (3) is fixedly connected to the top surface of the multiple columns (2). The top support platform (3) is top A motor (4) is fixedly connected to the surface. The output shaft of the motor (4) passes through the top support platform (3). The output of the motor (4) extends out of the lower end of the top support platform (3) and is fixedly connected to a rotating shaft (10) via a coupling. The rotating shaft (10) is coaxial with the straight cylinder (101). A sand pushing assembly (18) is fixedly connected to the lower end of the rotating shaft (10). The sand pushing assembly (18) is rotatably connected to the top surface of the fine screen (12). The sand pushing assembly (18) includes a fixed tube (1801) and a baffle (1802). The fixed tube (1801) is fixedly connected to the lower end of the rotating shaft (10). The fixed tube (1801) is coaxial with the rotating shaft (10). The baffle (1802) is fixedly connected to the outer wall of the fixed tube (1801). There are multiple baffles (1802). The multiple baffles (1802) are evenly distributed around the axis of the fixed tube (1801).

2. The fine sand screening device for construction according to claim 1, characterized in that: The fixed tube (1801) has a threaded hole I (1803) at the center of its top surface. The rotating shaft (10) has an external thread (1001) on its lower outer wall. The external thread (1001) is connected to the threaded hole I (1803). The fixed tube (1801) has a threaded hole II (1804) on its side wall. The threaded hole II (1804) penetrates the side wall of the fixed tube (1801) on one side. A set screw is connected in the threaded hole II (1804). The front end of the set screw is abutted against the external thread (1001).

3. The fine sand screening device for construction according to claim 2, characterized in that: A hydraulic cylinder (9) is fixedly connected to the bottom surface of the support platform (3). The piston rod of the hydraulic cylinder (9) faces the straight cylinder (101). A coarse screen (11) is slidably connected inside the straight cylinder (101). The coarse screen (11) is located above the fine screen (12). The coarse screen (11) is coaxial with the straight cylinder (101). The outer diameter of the coarse screen (11) is slightly smaller than the inner diameter of the straight cylinder (101). A connecting pipe (14) is fixedly connected to the top surface of the coarse screen (11). The front end of the piston rod of the hydraulic cylinder (9) is inserted into the connecting pipe (14). The hydraulic cylinder (9) and the connecting pipe (14) are connected by bolts and nuts. Both the hydraulic cylinder (9) and the connecting pipe (14) are provided with holes for bolts to pass through. After the bolt passes through the hydraulic cylinder (9) and the connecting pipe (14), the nut is connected.

4. The fine sand screening device for construction according to claim 3, characterized in that: The hydraulic cylinders (9) are provided in multiples, and the multiple hydraulic cylinders (9) are evenly distributed around the axis of the rotating shaft (10). The connecting pipes (14) are provided in multiples, and the number of multiple connecting pipes (14) is the same as that of multiple hydraulic cylinders (9). The piston rods of the multiple hydraulic cylinders (9) are inserted into the multiple connecting pipes (14) one by one. The multiple hydraulic cylinders (9) and the multiple connecting pipes (14) are all connected by bolts and nuts.

5. A fine sand screening device for construction according to claim 4, characterized in that: The coarse screen (11) has a central hole (1101) in the center, and a central tube (13) is fixedly connected inside the central hole (1101). The central tube (13) is coaxial with the coarse screen (11), and both the upper and lower ends of the central tube (13) extend out of the coarse screen (11). The inner diameter of the central tube (13) is larger than the outer diameter of the rotating shaft (10), and the central tube (13) is slidably connected to the outside of the rotating shaft (10).

6. The fine sand screening device for construction according to claim 5, characterized in that: A vibrating column (15) is fixedly connected to the bottom surface of the coarse screen (11), and a connecting seat (16) is fixedly connected to the outer wall of the rotating shaft (10). The connecting seat (16) is located below the coarse screen (11). A groove (1601) is provided on the side wall of the connecting seat (16) away from the rotating shaft (10). A striking plate (17) is inserted into the groove (1601). The striking plate (17) contacts the vibrating column (15). The striking plate (17) and the connecting seat (16) are connected by bolts and nuts. Both the striking plate (17) and the connecting seat (16) are provided with holes for bolts to pass through. After the bolt passes through the striking plate (17) and the connecting seat (16), the nut is connected.

7. A fine sand screening device for construction according to claim 6, characterized in that: The vibrating column (15) includes a top seat (1501), a lower column (1503), and a spring (1505). The top surface of the top seat (1501) is fixedly connected to the bottom surface of the coarse screen (11). The bottom surface of the top seat (1501) is provided with an inner hole I (1502). The lower column (1503) is located below the top seat (1501). The top surface of the lower column (1503) is provided with an inner hole II (1504). The two ends of the spring (1505) are respectively fixedly connected to the inner hole I (1502) and the inner hole II (1505). Inside 1504), the striking plate (17) contacts the outer wall of the lower column (1503); multiple vibrating columns (15) are provided, and the multiple vibrating columns (15) are evenly distributed around the axis of the rotating shaft (10); multiple connecting seats (16) are provided, and the multiple connecting seats (16) are evenly distributed around the axis of the rotating shaft (10); each connecting seat (16) is connected to a striking plate (17); the material of the lower column (1503) is rubber; the material of the striking plate (17) is rubber.

8. A fine sand screening device for construction according to claim 7, characterized in that: The outer diameter of the piston rod of the hydraulic cylinder (9) is smaller than the inner diameter of the connecting pipe (14), and there is a gap between the bottom surface of the hydraulic cylinder (9) and the top surface of the coarse screen (11).

9. A fine sand screening device for construction according to any one of claims 1-8, characterized in that: The lower end of the funnel cylinder (102) is fixedly connected to a feeding valve (6), and the end of the feeding valve (6) away from the funnel cylinder (102) is fixedly connected to a feeding pipe (7).

10. A fine sand screening device for construction according to any one of claims 1-8, characterized in that: The lower part of the sand screening cylinder (1) is fixedly connected to a support leg (5), the lower end of the support leg (5) is fixedly connected to a caster, and the lower part of the support leg (5) is fixedly connected to a counterweight (8).

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