Coarse aggregate screening device for concrete
By designing a combined structure of belt conveyor and screening cylinder, precise screening of coarse aggregate was achieved, solving the problem of inaccurate screening of coarse aggregate in existing equipment, reducing waste and improving production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENAN HUIGU MATERIAL TECHNOLOGY CO LTD
- Filing Date
- 2025-03-31
- Publication Date
- 2026-04-14
AI Technical Summary
In the screening process of existing concrete production equipment, materials with particle sizes within the preset range in the coarse aggregate are easily discharged together with coarse aggregates with excessively large particle sizes, resulting in an increase in waste and increased operating costs for enterprises.
A concrete coarse aggregate screening device was designed, including a belt conveyor, a storage bin, a buffer bin, a screening bin, and a screening cylinder. Through auger deceleration conveying, arc blade stirring, and screen screening, the device achieves precise separation of coarse aggregate and reduces the content of qualified particle size in the oversize material.
It effectively reduced the content of coarse aggregate with qualified particle size in the oversize material, reduced waste, lowered operating costs, and improved work efficiency.
Smart Images
Figure CN224114571U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sand and gravel screening equipment for concrete raw materials, and specifically to a coarse aggregate screening device for concrete. Background Technology
[0002] Concrete is one of the most important civil engineering materials in modern times. It is an artificial stone material made by mixing cementitious materials, granular aggregates (also known as aggregates), water, and, when necessary, admixtures and additives in a certain proportion, uniformly mixing, compacting, and curing. Concrete is characterized by abundant raw materials, low price, and simple production process, leading to its increasing use. Concrete also features high compressive strength, good durability, and a wide range of strength grades. These characteristics make it widely used, not only in various civil engineering projects, but also in shipbuilding, machinery manufacturing, marine development, geothermal engineering, and other fields.
[0003] Hydraulic coarse aggregates with a gradation of 5mm to 20mm and 20mm to 40mm, conforming to the "Specifications for Construction of Hydraulic Concrete" SL677-2014, are widely used in hydraulic engineering projects. For concrete with the same slump and strength grade, differences in coarse aggregate size and gradation will result in variations in water and cementitious material usage, leading to differences in the concrete's mechanical properties. In actual production, coarse aggregates are generally purchased raw materials. While these purchased materials undergo incoming inspection and are deemed qualified, the sampling and testing, although conducted according to national standards, only provides a general indication of the product's characteristics, thus preventing excessive waste. Waste, however, arises from further screening of different particle sizes during the actual production process.
[0004] Screening equipment used in production differs from laboratory screening equipment. While balancing efficiency with environmental factors such as dust generation, existing production screening equipment, despite its high screening speed, often results in coarse aggregates within the pre-selected particle size range being discharged as oversize aggregates along with the screen material. Observation and analysis during actual operation revealed that the excessive material flow rate and excessive material accumulation within the screening chamber caused coarse aggregates of the pre-selected particle size range, which should have passed through the screening holes, to be discharged along with oversize aggregates through the oversize material channel. Therefore, existing technology has room for improvement, aiming to reduce the content of coarse aggregates within the pre-selected particle size range in the oversize material, thereby reducing waste and lowering operating costs for the enterprise. Summary of the Invention
[0005] To address the shortcomings of existing technologies, this utility model provides a coarse aggregate screening device for concrete that adjusts the feed rate of the screening equipment, thereby overcoming the deficiencies in existing technologies.
[0006] The technical solution adopted by this utility model is as follows: a coarse aggregate screening device for concrete, including a belt conveyor, the belt conveyor including a conveyor belt, an outer support set on the outside of the belt conveyor, a storage bin set on the outer support, a first discharge port set at the bottom of the storage bin, a butterfly valve set on the first discharge port, a buffer bin set on the outer support between the first discharge port and the conveyor belt, the buffer bin adopts a box-shaped structure with an open top, a screening bin set on one side of the buffer bin, the screening bin adopts a box-shaped structure with an open bottom, and the opening end of the screening bin is located above the conveyor belt. A second discharge port is provided at the end of the screening chamber away from the buffer chamber. Fixed limiting rings are provided at both the second discharge port and the end of the screening chamber near the buffer chamber. Each fixed limiting ring is provided with a movable limiting ring. Screening cylinders are provided on several movable limiting rings. A first drive shaft is provided inside the screening cylinder. A transmission connecting rod is provided on each fixed limiting ring and the first drive shaft. A third discharge port is provided on the buffer chamber and the screening chamber. The third discharge port is located inside the screening cylinder. A second drive shaft is provided in the buffer chamber on the side of the third discharge port away from the screening chamber. An auger is provided on the second drive shaft.
[0007] Preferably, the third discharge port, the second drive shaft, and the auger are all located at the bottom of the buffer chamber, and the width of the bottom of the buffer chamber gradually increases along the direction from near the conveyor belt to far away from the conveyor belt.
[0008] Preferably, a screen is provided in the screening chamber above the screening cylinder. The screen has an arc-shaped cross-section. An air extraction pipe is provided above the screen. Several air extraction pipes are evenly distributed on the screening cylinder along the direction from one end of the first drive shaft to the other end of the first drive shaft.
[0009] Preferably, the belt conveyor further includes a drive idler mounted on one end of the conveyor belt, a driven idler mounted on the other end of the conveyor belt, a frame mounted on the driven idler and the drive idler, and a plurality of belt guiding devices arranged sequentially along the direction from the drive idler to the driven idler. The belt guiding device includes a guide bracket and a first guide idler and a second guide idler mounted on the guide bracket. The included angle between the central axis of the first guide idler and the central axis of the second guide idler is 110 degrees to 130 degrees.
[0010] Preferably, the width of the screening chamber cavity below the first drive shaft gradually decreases as the screening chamber moves further away from the first drive shaft.
[0011] Preferably, both the storage silo and the buffer silo are equipped with level gauges, and the storage silo is equipped with a drive cylinder. The slide gate butterfly valve includes a slide gate and a guide frame, and the slide gate and the output end of the drive cylinder are connected in a transmission connection.
[0012] Preferably, the inner side of the screening cylinder is provided with several arc-shaped blades.
[0013] The beneficial effects of this utility model are as follows: First, by transporting the coarse aggregate to be screened into the storage bin using an auger inside the storage bin, the coarse aggregate is decelerated and conveyed through the third discharge port. At the same time, the coarse aggregate to be screened is further reduced in speed by using several arc-shaped blades inside the screening cylinder to agitate it. This allows an appropriate amount of coarse aggregate to be screened to be fully screened, effectively reducing the amount of qualified coarse aggregate in the oversize material, reducing waste, and thus reducing operating costs.
[0014] Secondly, the third discharge port, the second drive shaft, and the auger described in this utility model are all located at the bottom of the buffer chamber, and the width of the bottom of the buffer chamber gradually increases along the direction from near the conveyor belt to far away from the conveyor belt; thus facilitating the guidance of materials in the buffer chamber.
[0015] Furthermore, both the storage silo and the buffer silo described in this utility model are equipped with level gauges to facilitate feedback on the material level.
[0016] This utility model has a simple structure, is easy to operate, and has a clever design, which greatly improves work efficiency and has good social and economic benefits. It is a product that is easy to promote and use. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of this utility model.
[0018] Figure 2 This is a cross-sectional structural diagram of the present invention.
[0019] Figure 3 This is a schematic diagram of the structure of this utility model. Detailed Implementation
[0020] like Figures 1 to 3As shown, a coarse aggregate screening device for concrete includes a belt conveyor, which includes a conveyor belt 1. An outer support 2 is provided on the outside of the belt conveyor, and a storage silo 3 is mounted on the outer support 2. A first discharge port 4 is provided at the bottom of the storage silo 3, and a butterfly valve 5 is provided on the first discharge port 4. A buffer silo 6 is provided on the outer support 2 between the first discharge port 4 and the conveyor belt 1. The buffer silo 6 has a box-shaped structure with an open top. A screening chamber 7 is provided on one side of the buffer silo 6. The screening chamber 7 has a box-shaped structure with an open bottom, and its open end is located above the conveyor belt 1. A valve is provided on the end of the screening chamber 7 away from the buffer silo 6. A fixed limiting ring 9 is provided at the end of the second discharge port 8 and the screening chamber 7 near the buffer chamber 6. Each fixed limiting ring 9 has a movable limiting ring 10. A screening cylinder 11 is provided on several movable limiting rings 10. A first drive shaft 12 is provided inside the screening cylinder 11. A transmission connecting rod 13 is provided on each fixed limiting ring 9 and the first drive shaft 12. A third discharge port 14 is provided on the buffer chamber 6 and the screening chamber 7. The third discharge port 14 is located inside the screening cylinder 11. A second drive shaft 15 is provided in the buffer chamber 6 on the side of the third discharge port 14 away from the screening chamber 7. An auger 16 is provided on the second drive shaft 15. The angle between the central axis of the screening cylinder 11 and the horizontal plane is not less than 15 degrees. The top surface of the conveyor belt 1 is parallel to the central axis of the screening cylinder 11. The screening cylinder 11 includes a screen cylinder body and screen holes opened on the screen cylinder body.
[0021] Furthermore, the third discharge port 14, the second drive shaft 15, and the auger 16 are all located at the bottom of the buffer chamber 6, and the width of the bottom of the buffer chamber 6 gradually increases along the direction from near to far from the conveyor belt 1. This facilitates the guidance of materials within the buffer chamber 6.
[0022] A screen 17 is installed in the screening chamber above the screening cylinder 11. The screen 17 has an arc-shaped cross-section. An air extraction pipe 18 is installed above the screen 17. Several air extraction pipes 18 are evenly distributed on the screening cylinder 11 along the direction from one end of the first drive shaft 12 to the other end of the first drive shaft 12. This allows for the use of several air extraction pipes 18 to extract air from the screening cylinder 11, thereby further screening the undersize material screened by the screening cylinder 11.
[0023] The belt conveyor also includes a drive idler 19 mounted on one end of the conveyor belt 1, a driven idler 20 mounted on the other end of the conveyor belt 1, a frame 21 mounted on the driven idler 20 and the drive idler 19, and several belt guiding devices arranged sequentially along the direction from the drive idler 19 to the driven idler 20 on the frame 21 between the driven idler 20 and the drive idler 19. Each belt guiding device includes a guide bracket 22 and a first guide idler 23 and a second guide idler 24 mounted on the guide bracket 22. The angle between the central axis of the first guide idler 23 and the central axis of the second guide idler 24 is between 110 and 130 degrees. Drive motors are respectively connected to the drive idler 19, the first drive shaft 12, and the second drive shaft 15. The first guide idler 23 and the second guide idler 24 facilitate the guidance of the conveyor belt 1, forming a concave area to facilitate the carrying of undersize material of a preset particle size discharged from the bottom of the screening chamber 7. Furthermore, the belt guide device comprises several units, some of which are located below the bottom of the screening chamber 7. The width of the inner cavity of the screening chamber 7 below the first drive shaft 12 gradually decreases as the screening chamber 7 moves further away from the first drive shaft 12. The first guide roller 23 and the second guide roller 24 are both located inside the conveyor belt 1, thereby facilitating the guidance of the material discharged from the bottom of the screening chamber 7.
[0024] Both the storage bin 3 and the buffer bin 6 are equipped with level gauges 25 to facilitate feedback of material level height; the storage bin 3 is equipped with a drive cylinder 26, and the slide plate butterfly valve 5 includes a slide plate and a guide frame, and the slide plate and the output end of the drive cylinder 26 are connected in a transmission manner.
[0025] The inner side of the screening cylinder 11 is provided with several arc-shaped blades 27; thereby, the gap between two adjacent arc-shaped blades 27 is used to limit the material in the flow state, which facilitates the stirring of the material.
[0026] The instructions for using this product are as follows: Figures 1 to 3As shown, firstly, the coarse aggregate to be screened is fed into the storage silo 3 until the level gauge 25 in the storage silo 3 reaches the preset level height. Several exhaust pipes 18 are connected to the dust extraction system, and the exhaust fan of the dust extraction system is turned on. Then, the drive motors on the drive roller 19, the first drive shaft 12, and the second drive shaft 15 are turned on. At this time, the drive roller 19 rotates, thereby driving the conveyor belt 1 to work, and the first drive shaft 12 rotates, driving the transmission connecting rod 13 and the movable limiting ring 10 to rotate, thereby driving the screen. The selection cylinder 11 rotates, and the second drive shaft 15 rotates, thereby driving the auger 16 to rotate. Then, the drive cylinder 26 is opened, and the drive cylinder 26 drives the slide gate butterfly valve 5 to open. The material to be screened in the storage silo 3 enters the storage silo 3 below the first discharge port 4 through the first discharge port 4. When the material level gauge 25 in the storage silo 3 reaches the preset material level height, the drive cylinder 26 drives the slide gate butterfly valve 5 to close. The coarse aggregate to be screened in the buffer silo 6 is decelerated under the drive of the auger 16 and enters the screening cylinder through the third discharge port 14. Inside the screening cylinder 11, the coarse aggregate to be screened enters the screening cylinder 11. Under the rotation of the screening cylinder 11 and the agitation of the arc-shaped blades 27 inside the screening cylinder 11, it moves along the inner wall of the screening cylinder 11 from the third discharge port 14 to the second discharge port 8. During this process, the undersize material in the coarse aggregate to be screened is discharged through the screen holes of the screening cylinder 11, while the larger particle size remains in the screening cylinder 11 and is discharged from the second discharge port 8, forming the oversize material. After passing through the screening cylinder 11, the undersize material is driven by several extraction pipes 18 connected to the dust extraction system and then... The dust extraction system draws airflow from several extraction pipes 18, driving the airflow in the screening chamber 7 toward the extraction pipes 18. The airflow in the screening chamber 7 carries the smaller particles of the undersize material, which undergoes secondary screening on the screen 17. The undersize material is the coarse aggregate that meets the particle size requirements. The particles that are too small enter the dust extraction system through the extraction pipes 18 for centralized processing. Finally, the coarse aggregate that meets the particle size requirements is discharged from the bottom of the screening chamber 7 and conveyed to the target area by the conveyor belt 1, completing the separation from the oversize material.
[0027] This embodiment achieves the following: by conveying the coarse aggregate to be screened into the storage bin 3, the auger 16 inside the storage bin 3 decelerates and conveys the coarse aggregate to be screened through the third discharge port 14. At the same time, the coarse aggregate to be screened is agitated by several arc-shaped blades 27 inside the screening cylinder 11, and the speed of the coarse aggregate to be screened in the screening cylinder 11 is further reduced. This allows an appropriate amount of coarse aggregate to be screened to be fully screened, effectively reducing the amount of qualified coarse aggregate in the oversize material, reducing waste and thus reducing operating costs.
[0028] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.
Claims
1. A coarse aggregate screening device for concrete, characterized in that: The system includes a belt conveyor, which includes a conveyor belt (1). An outer support (2) is provided on the outside of the belt conveyor. A storage bin (3) is provided on the outer support (2). A first discharge port (4) is provided at the bottom of the storage bin (3). A slide gate butterfly valve (5) is provided on the first discharge port (4). A buffer bin (6) is provided on the outer support (2) between the first discharge port (4) and the conveyor belt (1). The buffer bin (6) adopts a box-shaped structure with an open top. A screening bin (7) is provided on one side of the buffer bin (6). The screening bin (7) adopts a box-shaped structure with an open bottom. The open end of the screening bin (7) is located above the conveyor belt (1). A second discharge port (8) is provided on the end of the screening bin (7) away from the buffer bin (6). Fixed limiting rings (9) are provided at the end of the port (8) and screening chamber (7) near the buffer chamber (6). Each fixed limiting ring (9) is provided with a movable limiting ring (10). Screening cylinders (11) are provided on several movable limiting rings (10). A first drive shaft (12) is provided inside the screening cylinder (11). A transmission connecting rod (13) is provided on each fixed limiting ring (9) and the first drive shaft (12). A third discharge port (14) is opened on the buffer chamber (6) and screening chamber (7). The third discharge port (14) is located inside the screening cylinder (11). A second drive shaft (15) is provided in the buffer chamber (6) on the side of the third discharge port (14) away from the screening chamber (7). An auger (16) is provided on the second drive shaft (15).
2. The coarse aggregate screening device for concrete according to claim 1, characterized in that: The third discharge port (14), the second drive shaft (15) and the auger (16) are all located at the bottom of the buffer chamber (6), and the width of the bottom of the buffer chamber (6) gradually increases along the direction from near the conveyor belt (1) to away from the conveyor belt (1).
3. The coarse aggregate screening device for concrete according to claim 1, characterized in that: A screen (17) is provided in the screening chamber above the screening cylinder (11). The screen (17) has an arc-shaped cross-section. An air extraction pipe (18) is provided above the screen (17). The number of air extraction pipes (18) is several. The several air extraction pipes (18) are evenly distributed on the screening cylinder (11) along the direction from one end of the first drive shaft (12) to the other end of the first drive shaft (12).
4. The coarse aggregate screening device for concrete according to claim 1, characterized in that: The belt conveyor also includes a drive idler (19) set on one end of the conveyor belt (1), a driven idler (20) set on the other end of the conveyor belt (1), a frame (21) set on the driven idler (20) and the drive idler (19), and a number of belt guiding devices arranged sequentially along the direction from the drive idler (19) to the driven idler (20) between the driven idler (20) and the drive idler (19). The belt guiding device includes a guide bracket (22) and a first guide idler (23) and a second guide idler (24) set on the guide bracket (22). The included angle between the central axis of the first guide idler (23) and the central axis of the second guide idler (24) is 110 degrees to 130 degrees.
5. The coarse aggregate screening device for concrete according to claim 4, characterized in that: The width of the inner cavity of the screening chamber (7) below the first drive shaft (12) gradually decreases as the screening chamber (7) moves further away from the first drive shaft (12).
6. The coarse aggregate screening device for concrete according to claim 1, characterized in that: The storage bin (3) and buffer bin (6) are each equipped with a level gauge (25). The storage bin (3) is equipped with a drive cylinder (26). The slide gate butterfly valve (5) includes a slide gate and a guide frame. The slide gate and the output end of the drive cylinder (26) are connected by a transmission.
7. The coarse aggregate screening device for concrete according to claim 1, characterized in that: The inner side of the screening cylinder (11) is provided with several arc-shaped blades (27).