Screening device for concrete aggregate
The concrete aggregate screening device, designed with multi-stage coaxial screen cylinders and various screen hole shapes, solves the problems of low screening efficiency and aggregate mixing in existing technologies, and achieves efficient and accurate aggregate grading and stable output.
Patent Information
- Application Number
- CN202520142635.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-21
AI Technical Summary
Existing concrete aggregate screening technologies suffer from problems such as insufficient sieve aperture design, leading to repeated screening, high energy consumption, easy introduction of impurities, and easy mixing of aggregates of different particle sizes.
It adopts a multi-stage coaxial screen cylinder structure, combined with various screen hole shapes and guide support structure, and equipped with an adjustable inclined plate and discharge system to ensure accurate grading and stable discharge of aggregates.
It improves screening accuracy and efficiency, reduces repetitive operations, avoids aggregate mixing, enhances the stability and reliability of the equipment, and improves product quality.
Smart Images
Figure CN223832784U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of concrete material processing equipment, and in particular to a screening device for concrete aggregates. Background Technology
[0002] In the current booming construction industry, concrete, as one of the most widely used building materials, plays a decisive role in the safety and durability of construction projects. The quality and proper grading of concrete aggregates are key factors in ensuring excellent concrete performance. Therefore, efficient and accurate concrete aggregate screening technology is crucial. However, existing concrete aggregate screening technologies have significant shortcomings in terms of sieve design.
[0003] For example, common single-stage screening structures can only screen aggregates within a single particle size range at a time. For concrete production that requires aggregates of various particle sizes, multiple screening operations are necessary. This not only consumes a lot of time and energy but also easily introduces impurities during repeated operations, affecting aggregate quality. On the other hand, some simple multi-stage screening structures have an unreasonable layout and coordination between the screens, which can easily lead to clogging and mixing of aggregates when they transition between different screens. In view of this, this paper proposes a screening device for concrete aggregates. Utility Model Content
[0004] The main objective of this invention is to provide a screening device for concrete aggregates, which can effectively solve the problems in the prior art.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] A screening device for concrete aggregate includes a base frame, a multi-stage screen cylinder, and a multi-stage discharge box. A movable inclined plate is rotatably mounted above one end of the base frame, and a servo motor is fixedly mounted on the movable inclined plate. The multi-stage screen cylinder is rotatably mounted above the movable inclined plate.
[0007] The multi-stage screen cylinder includes an outer cylinder, a fine screen cylinder, a medium screen cylinder, and a coarse screen cylinder from the outside to the inside. One end of the coarse screen cylinder is fixedly connected to a feed pipe. The outer cylinder, fine screen cylinder, medium screen cylinder, and coarse screen cylinder are coaxially arranged with each other. A transmission mechanism is provided between the output end of the rotor of the servo motor and the outer cylinder.
[0008] The inner cavity of the multi-stage discharge box is rotatably connected to the discharge ports of the outer cylinder, fine screen cylinder, medium screen cylinder, and coarse screen cylinder, respectively.
[0009] Preferably, a first extension cylinder is coaxially fixedly connected to the end of the fine sieve cylinder, and a first annular isolation plate is coaxially fixedly installed on the periphery of the end of the first extension cylinder; a second extension cylinder is coaxially fixedly connected to the end of the medium sieve cylinder, and a second annular isolation plate is coaxially fixedly installed on the periphery of the end of the second extension cylinder; a third extension cylinder is coaxially fixedly connected to the end of the coarse sieve cylinder, and a third annular isolation plate is coaxially fixedly installed on the periphery of the end of the third extension cylinder; a circular plate is coaxially fixedly connected to one side of the third annular isolation plate; the upper part of the multi-stage discharge box is cylindrical, and the outer rings of the first annular isolation plate, the second annular isolation plate, the third annular isolation plate, and the circular plate are sequentially coaxially rotatably installed on the upper inner wall of the multi-stage discharge box; and a bone meal discharge port, a fine aggregate discharge port, a medium aggregate discharge port, and a coarse aggregate discharge port are sequentially fixedly connected to the lower part of the multi-stage discharge box.
[0010] Preferably, four pulley seats are fixedly installed on the movable inclined plate, and guide wheels are rotatably installed on the top of the four pulley seats. Both ends of the outer cylinder are coaxially fixedly connected to annular guide rails. The outer ring of the annular guide rails is provided with guide grooves, and the outer rings of the four guide wheels are respectively rolled in the guide grooves of two annular guide rails.
[0011] Preferably, the transmission mechanism consists of a meshing drive gear and an external gear ring. The drive gear is coaxially and fixedly connected to the output end of the rotor in the servo motor via a coupling, and the external gear ring is coaxially and fixedly installed on the outer wall of the outer cylinder.
[0012] Preferably, limiting rods are symmetrically and rotatably connected on both sides below the bone meal outlet, and two limiting grooves are provided on one side of the base frame, with one end of the limiting rod slidably installed in the limiting groove.
[0013] Preferably, an internally threaded cylinder is rotatably mounted above one end of the base frame, and a T-shaped screw is rotatably mounted inside the internally threaded cylinder. The end of the T-shaped screw is rotatably mounted below the movable inclined plate.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] 1. Improved screening accuracy and efficiency
[0016] 1.1 Unique Screen Design: Existing technologies mostly use screens with a single shape or simple aperture for grading; this device sets screens with various shapes such as circles, squares, and regular hexagons with decreasing apertures on the fine, medium, and coarse screen cylinders. These multiple screen shapes allow for screening of aggregates from both particle size and shape dimensions, enabling more precise separation of aggregates of different shapes and greatly improving screening accuracy. For example, flaky aggregates pass through square screens more easily, while round aggregates are better screened through round screens. The combination of different screen shapes avoids screening errors caused by differences in aggregate shape, significantly improving screening efficiency and quality—a feature not found in existing technologies.
[0017] 1.2 Multi-stage coaxial screen cylinder structure: Unlike common single-stage or simple multi-stage screening structures, the outer cylinder, fine screen cylinder, medium screen cylinder, and coarse screen cylinder of this device are coaxially arranged from the outside to the inside. This structure allows the aggregate to pass through the coarse, medium, and fine screens sequentially within the screen cylinder, achieving finer grading and screening. Compared with existing technologies, it reduces repeated screening steps and improves screening efficiency. At the same time, the close cooperation between the screen cylinders ensures effective separation of aggregates at each stage, avoids mixing of aggregates of different particle sizes, and improves product quality.
[0018] 2. Enhanced device stability and reliability
[0019] 2.1 Innovative Guiding and Support Structure: Existing screening devices are prone to swaying and shifting during screen rotation, affecting screening efficiency and device lifespan. This device features four pulley seats on the movable inclined plate, with guide wheels at the top of each pulley seat engaging with guide grooves on the annular guide rails at both ends of the outer cylinder. This design not only provides stable support for the outer cylinder but also guides it to roll smoothly, effectively reducing swaying and shifting during screen rotation. Even during long-term, high-intensity screening operations, this device ensures stable operation, improves reliability, and reduces maintenance costs and downtime.
[0020] 2.2 Inclination Angle Adjustment System: Traditional screening devices have fixed or inconveniently adjustable inclination angles, making it difficult to adapt to the screening of aggregates of different types and moisture levels. This device, by setting an internal threaded cylinder and a T-shaped screw on the base frame, can easily adjust the inclination angle of the movable inclined plate and multi-stage screen cylinders. Operators can quickly adjust the inclination of the screen cylinders according to actual needs, so that the flow rate of aggregates in the screen cylinders and the screening effect are optimized. This innovative design improves the adaptability of this device to different working conditions and enhances its versatility and reliability.
[0021] 3. Optimization of the discharge system
[0022] 3.1 Extension Cylinder and Isolation Plate Design: Existing discharge structures often result in the mixing of aggregates of different particle sizes during the discharge process. This device is equipped with extension cylinders and annular isolation plates at the ends of each stage of the screen cylinder, such as the first extension cylinder and first annular isolation plate of the fine screen cylinder, and the second extension cylinder and second annular isolation plate of the medium screen cylinder. These extension cylinders guide the aggregates to flow accurately to the corresponding discharge ports, while the annular isolation plates effectively prevent aggregates of different particle sizes from mixing at the discharge ports. Compared with existing technologies, this ensures the accuracy and purity of aggregate discharge at each stage, thus improving product quality.
[0023] 3.2 Limiting Structure Design: A limiting rotating rod and a limiting slide are set below the bone meal discharge port. This design is relatively rare in the existing technology. The limiting structure restricts the swing range of the multi-stage discharge box, ensuring the stability of the discharge process. It effectively prevents poor discharge or aggregate spillage caused by the shaking of the discharge box, and improves the discharge efficiency and the cleanliness of the production environment. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0025] Figure 2 This is a structural schematic diagram of the base frame and movable inclined plate in this utility model;
[0026] Figure 3 This is a schematic diagram of the structure of the multi-stage discharge box in this utility model;
[0027] Figure 4 This is a schematic diagram of the structure of the multi-stage sieve cylinder in this utility model;
[0028] Figure 5 This is a cross-sectional view of the present invention.
[0029] In the diagram: 1. Base frame; 2. Movable inclined plate; 3. Internal threaded cylinder; 4. T-shaped screw; 5. Servo motor; 6. Drive gear; 7. Outer cylinder; 8. External gear ring; 9. Annular guide rail; 10. Pulley seat; 11. Guide wheel; 12. Feed pipe; 13. Multi-stage discharge box; 14. Coarse aggregate discharge port; 15. Medium aggregate discharge port; 16. Fine aggregate discharge port; 17. Bone meal discharge port; 18. Limiting chute; 19. Limiting rotating rod; 20. Coarse screen cylinder; 21. Medium screen cylinder; 22. Fine screen cylinder; 23. First extension cylinder; 24. First annular partition plate; 25. Second extension cylinder; 26. Second annular partition plate; 27. Third extension cylinder; 28. Third annular partition plate; 29. Circular plate. Detailed Implementation
[0030] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0031] like Figures 1-5 As shown, a screening device for concrete aggregate includes a base frame 1 as a basic support structure. A movable inclined plate 2 is rotatably connected to the upper right end of the base frame 1. A servo motor 5 is fixedly installed on the movable inclined plate 2, providing power for subsequent screening operations. An internally threaded cylinder 3 is rotatably installed above the left end of the base frame 1. A T-shaped screw 4 is rotatably installed inside the internally threaded cylinder 3. The end of the T-shaped screw 4 is also rotatably connected to the lower part of the movable inclined plate 2. By rotating the T-shaped screw 4, the operator can flexibly adjust the tilt angle of the movable inclined plate 2 using the threaded transmission principle, thereby synchronously adjusting the tilt angle of the multi-stage screen cylinder installed above the movable inclined plate 2. It is worth noting that regardless of the adjustment, the left end of the outer cylinder 7 in the multi-stage screen cylinder always remains higher than the right end. This design ensures that the raw material entering the multi-stage screen cylinder can rotate and roll to the right under the combined action of gravity and the rotation of the screen cylinder, laying the foundation for the subsequent screening process.
[0032] refer to Figure 1 , Figure 4 and Figure 5 It is known that the multi-stage screen cylinder is rotatably installed above the movable inclined plate 2, and from the outside to the inside, it includes an outer cylinder 7, a fine screen cylinder 22, a medium screen cylinder 21, and a coarse screen cylinder 20. The outer cylinder 7, the fine screen cylinder 22, the medium screen cylinder 21, and the coarse screen cylinder 20 are coaxially arranged to ensure stable operation during rotation. The left end of the coarse screen cylinder 20 is fixedly connected to the feed pipe 12, which is the inlet for the concrete aggregate to be screened to enter the multi-stage screen cylinder. A transmission mechanism is set between the output end of the rotor in the servo motor 5 and the outer cylinder 7. This transmission mechanism can transmit the power output by the servo motor 5 to the outer cylinder 7, thereby driving the entire multi-stage screen cylinder to perform rotational screening operations. The transmission mechanism consists of a meshing drive gear 6 and an external gear ring 8. The drive gear 6 is coaxially and fixedly connected to the output end of the rotor in the servo motor 5 through a coupling. The external gear ring 8 is coaxially and fixedly installed on the outer wall of the outer cylinder 7.
[0033] refer to Figure 1 , Figure 2 and Figure 5 It is known that, in order to ensure the stability of the outer cylinder 7 during rotation, four pulley seats 10 are fixedly installed on the movable inclined plate 2. Each pulley seat 10 has a guide wheel 11 rotatably installed at its top. At the same time, annular guide rails 9 are coaxially fixedly connected to both ends of the outer cylinder 7. The outer ring of the annular guide rails 9 is provided with guide grooves. The outer rings of the four guide wheels 11 are respectively rolled in the guide grooves in the two annular guide rails 9. The four pulley seats 10 are respectively located at the four lower corners of the outer cylinder 7. This structural design can not only provide stable support for the outer cylinder 7, but also guide the outer cylinder 7 to roll smoothly, effectively reducing the shaking and deviation during the rotation of the screen cylinder, and improving the stability and reliability of the screening operation.
[0034] refer to Figure 4 and Figure 5 It can be seen that the outer ring of the fine screen cylinder 22 is evenly distributed with fine screen holes of various shapes such as circles, squares, and regular hexagons. The outer ring of the medium screen cylinder 21 is also provided with medium screen holes of the above-mentioned various shapes. The outer ring of the coarse screen cylinder 20 is provided with coarse screen holes of circles, squares, and regular hexagons. Furthermore, the aperture size gradually decreases from the coarse screen holes to the medium screen holes to the fine screen holes. This unique screen hole design can screen concrete aggregates from both particle size and shape dimensions, greatly improving the accuracy and efficiency of screening. The screen holes of different shapes and sizes can adapt to aggregates of different shapes and sizes, so that the aggregates are separated more accurately during the rotation of the screen cylinder.
[0035] In this embodiment, when the servo motor 5 is connected to the power supply via a wire and is in an energized state, the motor starts, and its rotor output end drives the multi-stage screen cylinder to rotate slowly through the transmission mechanism. After the raw material to be screened enters the coarse screen cylinder 20 through the feed pipe 12, due to the rotation of the screen cylinder and its own gravity, most of the raw material will move slowly at the lower end of the coarse screen cylinder 20. During this process, a small portion of coarse or medium aggregate stuck in the coarse screen holes will fall back into the coarse screen cylinder 20 due to its own gravity when the screen cylinder rotates to the upper end of the coarse screen holes. Meanwhile, the medium aggregate, fine aggregate, and powder in the coarse screen cylinder 20 will pass through the screen in sequence. The aggregate falls through the coarse sieve holes onto the inner wall of the intermediate sieve cylinder 21. Then, the fine aggregate and powder in the intermediate sieve cylinder 21 fall through the intermediate sieve holes onto the inner wall of the fine sieve cylinder 22. The powder in the fine sieve cylinder 22 eventually falls through the fine sieve holes onto the inner wall of the outer cylinder 7 and is gradually conveyed to the bone powder outlet 17 as the outer cylinder 7 rotates. At the same time, the fine aggregate in the fine sieve cylinder 22 is conveyed to the fine aggregate outlet 16 through the first extension cylinder 23, the medium aggregate in the intermediate sieve cylinder 21 is conveyed to the medium aggregate outlet 15 through the second extension cylinder 25, and the coarse aggregate in the coarse sieve cylinder 20 is conveyed to the coarse aggregate outlet 14 through the third extension cylinder 27.
[0036] refer to Figure 4 and Figure 5 It is known that, in order to ensure that aggregates of different particle sizes can fall accurately into the corresponding discharge ports, the end of the fine screen cylinder 22 is coaxially fixedly connected to the first extension cylinder 23, and the outer periphery of the end of the first extension cylinder 23 is coaxially fixedly installed with the first annular isolation plate 24. The end of the middle screen cylinder 21 is coaxially fixedly connected to the second extension cylinder 25, and the outer periphery of the end of the second extension cylinder 25 is coaxially fixedly installed with the second annular isolation plate 26. The end of the coarse screen cylinder 20 is coaxially fixedly connected to the third extension cylinder 27, and the outer periphery of the end of the third extension cylinder 27 is coaxially fixedly installed with the third annular isolation plate 28. A circular plate 29 is coaxially fixedly connected to one side of the third annular isolation plate 28.
[0037] Figure 3 and Figure 5 It can be seen that the upper part of the multi-stage discharge box 13 is cylindrical, and its left end is coaxially and rotatably connected to the right end of the outer cylinder 7 through a bearing, which ensures the sealing and stability of the outer cylinder 7 and the multi-stage discharge box 13 during rotation. At the same time, the outer rings of the first annular isolation plate 24, the second annular isolation plate 26, the third annular isolation plate 28 and the circular plate 29 are sequentially and coaxially rotatably installed on the upper inner wall of the multi-stage discharge box 13. Below the multi-stage discharge box 13, bone meal discharge ports 17 are sequentially fixed and connected. The system includes a fine aggregate outlet 16, a medium aggregate outlet 15, and a coarse aggregate outlet 14. A first annular partition plate 24, a second annular partition plate 26, and a third annular partition plate 28 are sequentially arranged between the inlets of the bone meal outlet 17, the fine aggregate outlet 16, the medium aggregate outlet 15, and the coarse aggregate outlet 14. This structural design can effectively prevent aggregates of different particle sizes from mixing during the discharge process, ensuring that aggregates of each grade can be accurately and smoothly discharged from their respective outlets.
[0038] refer to Figure 1 , Figure 2 and Figure 3 It can be seen that there are symmetrically rotating limit rods 19 connected to both sides below the bone meal outlet 17, and two limit grooves 18 are provided on one side of the base frame 1. One end of the limit rod 19 is slidably installed in the limit groove 18. This limit structure can limit the swing range of the multi-stage discharge box 13 to a certain extent, ensure the stability of the discharge process, and prevent problems such as poor discharge or aggregate spillage caused by the shaking of the discharge box.
[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A screening device for concrete aggregates, characterized in that: It includes a base frame (1), a multi-stage screen cylinder and a multi-stage discharge box (13). A movable inclined plate (2) is rotatably installed above one end of the base frame (1). A servo motor (5) is fixedly installed on the movable inclined plate (2). The multi-stage screen cylinder is rotatably installed above the movable inclined plate (2). The multi-stage screen cylinders include, from the outside to the inside, an outer cylinder (7), a fine screen cylinder (22), a medium screen cylinder (21), and a coarse screen cylinder (20). One end of the coarse screen cylinder (20) is fixedly connected to a feed pipe (12). The outer cylinder (7), fine screen cylinder (22), medium screen cylinder (21), and coarse screen cylinder (20) are coaxially arranged with each other. A transmission mechanism is provided between the output end of the rotor of the servo motor (5) and the outer cylinder (7). The inner cavity of the multi-stage discharge box (13) is rotatably connected to the discharge ports of the outer cylinder (7), fine screen cylinder (22), medium screen cylinder (21), and coarse screen cylinder (20).
2. The screening device for concrete aggregates according to claim 1, characterized in that: The end of the fine sieve cylinder (22) is coaxially fixedly connected to a first extension cylinder (23), and a first annular partition plate (24) is coaxially fixedly installed around the end of the first extension cylinder (23). The end of the medium sieve cylinder (21) is coaxially fixedly connected to a second extension cylinder (25), and a second annular partition plate (26) is coaxially fixedly installed around the end of the second extension cylinder (25). The end of the coarse sieve cylinder (20) is coaxially fixedly connected to a third extension cylinder (27), and a third annular partition plate (28) is coaxially fixedly installed around the end of the third extension cylinder (27). The third annular partition plate (28) is coaxially fixedly connected to a circular plate (29) on one side. The upper part of the multi-stage discharge box (13) is cylindrical. The outer rings of the first annular partition plate (24), the second annular partition plate (26), the third annular partition plate (28) and the circular plate (29) are coaxially rotated and installed on the upper inner wall of the multi-stage discharge box (13) in sequence. The lower part of the multi-stage discharge box (13) is sequentially fixedly connected to a bone meal discharge port (17), a fine aggregate discharge port (16), a medium aggregate discharge port (15) and a coarse aggregate discharge port (14).
3. The screening device for concrete aggregates according to claim 1, characterized in that: Four pulley seats (10) are fixedly installed on the movable inclined plate (2). Guide wheels (11) are rotatably installed on the top of the four pulley seats (10). Both ends of the outer cylinder (7) are coaxially fixedly connected to annular guide rails (9). The outer ring of the annular guide rails (9) is provided with guide grooves. The outer rings of the four guide wheels (11) are respectively rolled in the guide grooves of the two annular guide rails (9).
4. The screening device for concrete aggregates according to claim 1, characterized in that: The transmission mechanism consists of a drive gear (6) and an external gear ring (8) that mesh with each other. The drive gear (6) is coaxially and fixedly connected to the output end of the rotor in the servo motor (5) through a coupling. The external gear ring (8) is coaxially and fixedly installed on the outer wall of the outer cylinder (7).
5. The screening device for concrete aggregates according to claim 2, characterized in that: The bone meal outlet (17) is symmetrically connected to two limiting rods (19) on both sides below it. Two limiting grooves (18) are provided on one side of the base frame (1). One end of the limiting rod (19) is slidably installed in the limiting groove (18).
6. The screening device for concrete aggregates according to claim 1, characterized in that: An internally threaded cylinder (3) is rotatably mounted above one end of the base frame (1), and a T-shaped screw (4) is rotatably mounted inside the internally threaded cylinder (3). The end of the T-shaped screw (4) is rotatably mounted below the movable inclined plate (2).