Screening device for adjusting grading of machine-made sand
By designing an adjustable screening device, the problems of high amount of stone powder and high grading adjustment cost in the dry sand production system are solved, and the grading adjustment and dust removal of sand are achieved, which is suitable for water-deficient environments.
Patent Information
- Application Number
- CN202421769274.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-25
AI Technical Summary
When the existing dry sand production system produces machined sand, the sand contains high amount of stone powder, which is difficult to meet the technical requirements of concrete sand, and the grading adjustment cost is high, especially in water-scarce environments.
A screening device is designed, including a frame, a screen rack, a vibrator and an adjustable screen. By adjusting the angle of the screen rack and the aperture of the screen, the grading of the machine sand can be adjusted.
Through the use of this device, fine particles of dust in the sand can be effectively removed, and the grading of the sand can be adjusted to meet the technical requirements of concrete sand, reducing costs, and adapting to water-deficient environments.
Smart Images
Figure CN222901785U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of screening devices or sand making equipment for construction sand, and particularly relates to a screening device for adjusting the gradation of machine-made sand. Background Technique
[0002] Sand is an important component of concrete construction materials. Machine-made sand is generally produced in a sand and gravel aggregate screening system, and there are two processes: dry production and wet production.
[0003] The dry sand and gravel production system consists of a vibrating feeder, a coarse crushing jaw crusher, an intermediate crushing cone crusher, a fine crushing cone crusher, a sand making machine, a circular vibrating screen, a belt conveyor, a finished aggregate bin, etc.; compared with the wet production system, it lacks sand washing equipment, dehydration equipment, and sand washing and recycling equipment, etc. In dry production, except for spraying dust removal at the main crushing equipment, the original rock materials and intermediate products are processed in a dry state during the production process. Often, the sand produced contains a high amount of stone powder and does not meet the technical requirements of sand for concrete. Due to the different properties of the original rock, the gradation of machine-made sand is different. For the sand produced by dry production, if it cannot be used due to a high gradation, it will cause great waste. To solve these problems, generally, it is necessary to add sand washing equipment or wind power equipment to adjust the gradation of the sand, and the cost is relatively high. In order to reduce costs and adapt to the adjustment of the sand gradation in a water-scarce environment, through research and experimental analysis, a screening system is designed. Through screening, the gradation of machine-made sand can be adjusted to make the machine-made sand meet the technical requirements of sand for concrete. Summary of the Invention
[0004] The technical problem to be solved by the utility model is to overcome the above-mentioned deficiencies of the prior art, and provide a machine-made sand gradation screening device with reasonable design, simple structure, strong practicability, and capable of adjusting the gradation of machine-made sand.
[0005] The technical solution adopted to solve the above technical problem is: a screening device for adjusting the gradation of machine-made sand, characterized in that: a feeding belt conveyor is arranged on one side of the frame, a feeding hopper is arranged at the discharge port of the feeding belt conveyor, the feeding hopper is fixed on the frame, a screening frame is obliquely arranged on the frame below the feeding hopper, a screen mesh is arranged on the screening frame, a screened material hopper is arranged on the frame directly below the screening frame, and a finished product hopper is arranged obliquely below. A waste material conveying belt conveyor is arranged below the screened material hopper, and a finished product conveying belt conveyor is arranged below the finished product hopper.
[0006] An upper cross beam is arranged on one side of the frame of the utility model, and a lower cross beam is arranged on the opposite side. The upper end of the screening frame is arranged on the upper cross beam through a U-shaped hoop, and the lower end is arranged on the lower cross beam.
[0007] A bearing is provided between the upper crossbeam of the utility model and the frame. The upper crossbeam can rotate around the frame. The lower crossbeam is arranged on the frame through an adjusting slideway, and the lower crossbeam can slide on the slideway. Both sides of the lower end of the sieve frame are connected to the chain hoists fixed on the upper part of the frame.
[0008] A shock-absorbing rubber is provided between the U-shaped hoop of the utility model and the sieve frame.
[0009] A steel plate is provided at the lower end of the sieve frame of the utility model, and the steel plate extends above the finished product hopper.
[0010] A vibrator is provided on the sieve frame of the utility model.
[0011] Sieve skeletons are arranged vertically and horizontally on the sieve frame of the utility model, and the sieve mesh is arranged on the sieve skeletons.
[0012] A baffle is provided on the sieve frame of the utility model.
[0013] The upper part of the sieve discharge hopper of the utility model has a larger size than the sieve mesh.
[0014] The included angle between the sieve frame and the frame of the utility model is 40° - 50°.
[0015] Since the utility model is an independent screening device, placed behind the mechanism sand discharging machine, and consists of a frame, a sieve, and a vibrator. The frame is made of section steel for fixing the sieve. The sieve angle is generally about 40° - 50°. According to different material sources, the angle of the sieve frame needs to be adjusted during use. The upper crossbeam can rotate around the frame, and the lower crossbeam is arranged in the inclination adjustment slideway. The angle of the sieve frame is adjusted by lifting and lowering the chain hoist suspended on the upper part of the frame. After the angle is adjusted, temporary fixing measures are used to fix the lower crossbeam. After passing through this sieve, the purpose of removing fine particle dust can be achieved. Compared with ordinary screening devices, ordinary screening devices try to screen out as many particle sizes smaller than a certain pore size as possible, while this device can screen out a part of each particle size smaller than this particle size by adjusting the sieve meshes at different angles, so as to achieve the purpose of adjusting the sand gradation. Description of the Drawings
[0016] Figure 1 is a schematic structural diagram of an embodiment of the utility model.
[0017] Figure 2 is Figure 1 the right view of
[0018] Figure 3 is Figure 1 the A-A cross-sectional view of
[0019] Figure 4 is the sand screening curve before using this device. (Horizontal axis - particle diameter, unit: mm; vertical axis - passing percentage)
[0020] Figure 5 It is the sand screening curve after using this device.
[0021] In the figure: 1. Frame; 2. Screen frame; 3. Vibrator; 4. Finished product hopper; 5. Feed hopper; 6. Feed belt conveyor; 7. Inclination adjustment slideway; 8. Upper cross beam; 9. Shock-absorbing rubber; 10. Screen mesh; 11. U-shaped hoop; 12. Screen skeleton; 13. Baffle; 14. Steel plate; 15. Screened material hopper; 16. Waste material conveyor belt; 17. Finished product conveyor belt; 18. Chain block; 19. Lower cross beam. Specific implementation mode
[0022] The following further describes the present utility model in detail with reference to the drawings and embodiments, but the present utility model is not limited to these embodiments.
[0023] Embodiment 1
[0024] In Figure 1 , 2 , 3, a simple screening device for adjusting the gradation of manufactured sand according to the present utility model includes a frame 1, the frame 1 is arranged on the ground, a feed belt conveyor 6 is installed on one side of the frame 1, a feed hopper 5 is arranged at the discharge port of the feed belt conveyor 6, the feed hopper 5 is fixed on the frame 1, a screen frame 2 is inclinedly arranged on the frame 1 below the feed hopper 5, a screen mesh 10 is arranged on the screen frame 2, and the aperture of the screen mesh 10 can be determined according to the maximum particle size of the particle size group of the main stone powder to be removed. A vibrator 3 is arranged on the screen frame 2, and the vibrator 3 is used to increase the exciting force of the screen mesh 10 so that the materials on the screen mesh 10 can be smoothly screened. In this embodiment, the vibrator 3 is an ordinary flat vibrator, and its exciting force is not greater than 3000N. The screen skeletons 12 are arranged vertically and horizontally on the screen frame 2, the screen mesh 10 is arranged on the screen skeletons 12, and the screen skeletons 12 are used to provide a supporting force for the screen mesh 10 to prevent the screen mesh 10 from falling off. A baffle 13 is arranged on the screen frame 2, and the baffle 13 prevents the stone materials from overflowing during the screening process.
[0025] In this embodiment, an upper cross beam 8 is provided on one side of the rack 1, and a lower cross beam 19 is provided on the opposite side. The upper end of the sieve frame 2 is arranged on the upper cross beam 8 through a U-shaped hoop 11, and the lower end is arranged on the lower cross beam 19. In order to mitigate the vibration between the sieve frame 2 and the rack 1, a damping rubber 9 is provided between the U-shaped hoop 11 and the sieve frame 2. In order to facilitate the adjustment of the angle between the sieve frame 2 and the rack 1, a bearing is provided between the upper cross beam 8 and the rack 1, and the upper cross beam 8 can rotate around the rack 1. The lower cross beam 19 is arranged on the rack 1 through an adjustment slideway 7, and the lower cross beam 19 can slide on the slideway 7. Both sides of the lower end of the sieve frame 2 are connected to the chain hoist 18 fixed to the upper part of the rack 1. The chain hoist 18 pulls the sieve frame 2 to slide along the slideway 7 to adjust the angle between the sieve frame 2 and the rack 1. Generally, the adjustable angle is 40-50°. In this embodiment, the angle between the sieve frame 2 and the rack 1 is 45°. After the sieve frame 2 is adjusted to the specified position, it is temporarily fixed.
[0026] A sieve discharge hopper 15 is arranged on the rack 1 directly below the sieve frame 2, and a finished product hopper 4 is arranged obliquely below. Further, a steel plate 14 is arranged at the lower end of the sieve frame 2, and the steel plate 14 extends above the finished product hopper 4. The steel plate 14 is used to smoothly convey the finished product screened out on the sieve frame 2 to the finished product hopper 4. The upper size of the sieve discharge hopper 15 is larger than the size of the sieve mesh 10 to ensure that all the stones falling from the sieve mesh 10 enter the sieve discharge hopper 15. A waste material conveyor belt 16 is arranged below the sieve discharge hopper 15, and a finished product conveyor belt 17 is arranged below the finished product hopper 4.
[0027] In a hydropower project in Africa, the total amount of concrete is 200,000 cubic meters. The excavated sandstone is used for the processing of concrete aggregates. During the equipment commissioning period, the produced sand is tested and analyzed. The grading curve of the screened sand is as Figure 4 shown. After using this device, the grading of the sand has been greatly improved, and the grading curve of the sand is as Figure 5 shown.
[0028] The working principle of the present utility model is as follows:
[0029] After the feeding conveyor belt 6 discharges materials, the mixed sand passes through the feeding hopper 5 fixed on the sieve mesh and enters the sieve mesh 10. Then, under the action of gravity and the exciting force of the vibrator 3, the mixed sand is screened. The material discharged from the sieve mesh 10 is the finished sand, and the material below the sieve mesh 10 is the separated stone powder. The finished sand is sent out through the finished product conveyor belt 17 introduced by the finished product hopper 4, and the stone powder is sent out through the sieve discharge hopper 15 introduced by the waste material conveyor belt 16. According to the different material sources, the angle of the sieve frame 2 needs to be adjusted during use. The upper cross beam 8 can rotate around the rack 1, and the lower cross beam 19 is arranged in the inclination adjustment slideway 7. The angle of the sieve frame 2 is adjusted by the lifting of the chain hoist 18 suspended from the upper part of the rack 1. After the angle is adjusted, temporary fixing measures are adopted to fix the lower cross beam 19.
Claims
1. A screening device for adjusting the gradation of machine-made sand, comprising a frame (1), characterized in that: A feeding belt conveyor (6) is arranged on one side of the frame (1), a feeding hopper (5) is arranged at the discharge port of the feeding belt conveyor (6), the feeding hopper (5) is fixed on the frame (1), a screen frame (2) is obliquely arranged on the frame (1) below the feeding hopper (5), a screen mesh (10) is arranged on the screen frame (2), an under-screen hopper (15) is arranged on the frame (1) directly below the screen frame (2), a finished product hopper (4) is arranged obliquely below, a waste material discharge conveyor (16) is arranged below the under-screen hopper (15), and a finished product discharge conveyor (17) is arranged below the finished product hopper (4).
2. A screening device for adjusting the gradation of machine-made sand according to claim 1, characterized in that: An upper crossbeam (8) is arranged on one side of the frame (1), and a lower crossbeam (19) is arranged on the opposite side; the upper end of the screen frame (2) is arranged on the upper crossbeam (8) through a U-shaped hoop (11), and the lower end is arranged on the lower crossbeam (19).
3. A screening device for adjusting the gradation of machine-made sand according to claim 2, characterized in that: A bearing is arranged between the upper crossbeam (8) and the frame (1), the upper crossbeam (8) can rotate around the frame (1), the lower crossbeam (19) is arranged on the frame (1) through an adjusting slideway (7), the lower crossbeam (19) can slide on the slideway (7), and the two sides of the lower end of the screen frame (2) are connected to a fall chain (18) fixed on the upper part of the frame (1).
4. A screening device for adjusting the gradation of machine-made sand according to claim 2, characterized in that: A shock-absorbing rubber (9) is arranged between the U-shaped hoop (11) and the screen frame (2).
5. A screening device for adjusting the gradation of machine-made sand according to claim 1, characterized in that: A steel plate (14) is provided at the lower end of the screen frame (2), and the steel plate (14) extends to the top of the finished product hopper (4).
6. A screening device for adjusting the gradation of machine-made sand according to claim 1, characterized in that: The sieve frame (2) is provided with a vibrator (3).
7. A screening device for adjusting the gradation of machine-made sand according to claim 1, characterized in that: The sieve frame (2) is provided with sieve frames (12) in a crisscross pattern, and the sieve mesh (10) is arranged on the sieve frames (12).
8. A screening device for adjusting the gradation of machine-made sand according to claim 1, characterized in that: A baffle (13) is provided on the screen frame (2).
9. A screening device for adjusting the gradation of machine-made sand according to claim 1, characterized in that: The upper size of the under-screen hopper (15) is larger than the size of the screen (10).
10. A screening device for adjusting the gradation of machine-made sand according to claim 1, characterized in that: The angle between the screen frame (2) and the frame (1) is 40-50°.