A recycled concrete aggregate grading device

Abstract

The utility model relates to a kind of recycled concrete aggregate grading device, belong to concrete processing technical field.The utility model is by being provided with the fine screen section, middle screen section and coarse screen section of axial segmentation in drum screen inside, gradually change mesh design on cooperation splitter plate, make aggregate realize multistage synchronous screening in the process of drum rotation;Meanwhile, by splitter plate and conical fairing to concrete aggregate is dispersed, so that aggregate is evenly distributed to each flow channel under the action of centrifugal force, reduce the accumulation amount of concrete in the bottom of drum screen, gradually change mesh on the surface of splitter plate forms secondary dispersion mechanism, solve the problem of large amount of concrete aggregate accumulation in the bottom of traditional drum screen, significantly improve the screening efficiency and grading effect of concrete aggregate.

Description

Technical Field

[0001] This utility model belongs to the field of concrete processing technology, and specifically relates to a recycled concrete aggregate grading device. Background Technology

[0002] In the field of construction waste recycling, the grading and processing of recycled concrete aggregates is a key step. Effective grading of recycled concrete aggregates allows for the separate recycling of aggregates of different particle sizes, thereby improving their reuse rate in engineering construction.

[0003] Currently, most commonly used grading devices employ rotary drum screens as their core component, using a rotating drum screen to separate aggregates of different particle sizes. However, existing rotary drum screen grading devices have significant shortcomings in practical applications, particularly regarding aggregate accumulation during screening. Specifically, aggregates accumulate at the bottom of the drum screen, preventing some from passing through the corresponding screen openings in time, and even causing blockages, leading to reduced screening efficiency and affecting the grading effect. Therefore, there is an urgent need for a recycled concrete aggregate grading device that can effectively prevent aggregate accumulation and improve screening efficiency. Utility Model Content

[0004] To overcome the problem in existing drum screen grading devices where aggregates tend to accumulate at the bottom of the drum screen during screening, preventing some aggregates from passing through the corresponding screen holes in time and even causing blockages, thus reducing screening efficiency and affecting grading results, this invention provides a recycled concrete aggregate grading device. By setting axially segmented fine, medium, and coarse screening sections inside the drum screen, combined with a gradually changing mesh design on the diversion plate, the aggregates achieve multi-stage synchronous screening during drum rotation. Simultaneously, the diversion plate and conical guide hood disperse the concrete aggregates, ensuring even distribution to each guide channel under centrifugal force, reducing the amount of concrete accumulating at the bottom of the drum screen. The gradually changing mesh on the diversion plate surface forms a secondary dispersion mechanism, solving the problem of large concrete aggregate accumulation at the bottom of traditional drum screens, and significantly improving the screening efficiency and grading effect of concrete aggregates.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: A recycled concrete aggregate grading device mainly includes a frame, a feed hopper, a drum screen, a dust cover, a material dispersion mechanism, and a drive mechanism. The dust cover is fixedly installed on the frame. The drum screen is cylindrical and inclinedly installed on the frame at both ends via support wheels, located inside the dust cover. A feed hopper is fixedly installed on the side of the dust cover, with its bottom extending into the drum screen. The outer wall of the drum screen is provided with a gear ring that is connected to the drive mechanism. The inner wall of the drum screen is sequentially arranged along the axial direction with gradually increasing screen hole diameters in fine, medium, and coarse sections. A material dispersion mechanism for uniformly distributing materials is also provided inside the drum screen. The material dispersion mechanism includes a flow divider plate, a guide cylinder, a conical guide hood, and a baffle plate. Several flow dividers are evenly installed on the inner wall of the drum screen along the circumference. The surface of the flow dividers has mesh holes with gradually increasing diameters along the length direction, and the mesh hole sizes correspond to the fine screen section, medium screen section and coarse screen section respectively. The flow guide cylinder is coaxially set with the drum screen and connected to the flow dividers. The inside of the drum screen is divided into multiple flow channels with a fan-shaped cross-section by the flow guide cylinder and the flow dividers. A conical flow guide hood is fixedly installed inside the drum screen near the feed end. The tip of the conical flow guide hood faces the feed end, and the other end is connected to and fixed to the end of the flow guide cylinder. The outer wall of the conical flow guide hood is divided into multiple flow grooves corresponding to the flow channels by partitions, and the flow grooves are connected to the flow channels.

[0006] The bottom of the frame is equipped with an inclined first discharge chute, a second discharge chute, a third discharge chute, and a discharge chute. The first discharge chute, the second discharge chute, and the third discharge chute are located below the fine screen section, the medium screen section, and the coarse screen section of the drum screen, respectively. The discharge chute is located at the bottom of the end of the drum screen. The first discharge chute, the second discharge chute, the third discharge chute, and the discharge chute all penetrate the frame and extend to the outside to facilitate the collection and transportation of the graded materials.

[0007] The drive mechanism includes a motor and gears. The motor is fixedly mounted on the frame, and a gear that meshes with a gear ring is mounted on its output shaft to achieve stable rotation of the drum screen.

[0008] Multiple guide plates are equidistantly arranged on the end face of the diversion plate along the length direction, and the guide plates are inclined along one side of the end of the drum screen, thereby effectively guiding the material to move along the axial direction of the drum screen, avoiding material accumulation, and improving screening efficiency and grading effect.

[0009] The diameters of the sieve holes in the fine, medium, and coarse sections of the inner wall of the drum screen are set values ​​and increase sequentially.

[0010] The beneficial effects of this utility model are:

[0011] This invention achieves multi-stage synchronous screening of aggregates during drum rotation by setting axially segmented fine, medium, and coarse screening sections inside the drum screen, combined with a gradually changing mesh design on the diversion plate. Simultaneously, the diversion plate and conical guide hood disperse the concrete aggregates, ensuring even distribution to each guide channel under centrifugal force. This reduces the amount of concrete accumulating at the bottom of the drum screen. The gradually changing mesh on the diversion plate surface forms a secondary dispersion mechanism, solving the problem of large concrete aggregate accumulation at the bottom of traditional drum screens and significantly improving the screening efficiency and grading effect of concrete aggregates. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the drum screen structure of this utility model.

[0014] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0015] Figure 4 This is a three-dimensional schematic diagram of the internal structure of a drum screen.

[0016] Figure 5 yes Figure 4 A magnified view of a section at point B in the middle.

[0017] Figure 6 This is a side sectional view of the drum screen of this utility model.

[0018] The attached diagram is labeled as follows: 1. Frame; 2. Feed hopper; 3. Rotary drum screen; 4. Dust cover; 5. Material dispersion mechanism; 6. Drive mechanism; 7. First discharge chute; 8. Second discharge chute; 9. Third discharge chute; 10. Discharge chute; 301. Gear ring; 302. Fine screen section; 303. Medium screen section; 304. Coarse screen section; 501. Diverter plate; 502. Guide cylinder; 503. Conical guide shroud; 504. Baffle plate; 505. Guide plate; 601. Motor; 602. Gear. Detailed Implementation

[0019] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of those skilled in the art.

[0020] This utility model discloses a recycled concrete aggregate grading device, which mainly includes a frame 1, a feed hopper 2, a drum screen 3, a dust cover 4, a material dispersion mechanism 5, and a drive mechanism 6. The dust cover 4 is fixedly installed on the frame 1 to prevent dust generated during the screening process from overflowing, thereby improving the working environment and reducing material loss. The drum screen 3 is cylindrical and is inclinedly installed on the frame 1 at both ends by support wheels, and is located inside the dust cover 4. The outer wall of the drum screen 3 is provided with a toothed ring 301, which meshes with the gear 602 of the drive mechanism 6 to achieve stable rotation of the drum screen 3. The feed hopper 2 is fixedly installed on the side of the dust cover 4, and its bottom extends into the inside of the drum screen 3 to guide the aggregate to be graded into the drum screen 3. The inner wall of the drum screen 3 is provided with a fine screen section 302, a medium screen section 303, and a coarse screen section 304 arranged sequentially along the axial direction. The screen aperture diameter of each screen section gradually increases to achieve grading of aggregates of different particle sizes. The drum screen 3 is also equipped with a material dispersion mechanism 5, including a flow divider 501, a guide cylinder 502, a conical guide hood 503, and a baffle 504. The flow divider 501 is evenly distributed along the circumference of the inner wall of the drum screen 3, and its surface has mesh holes with gradually increasing diameters along the length direction. The mesh hole sizes correspond to the fine screen section 302, the medium screen section 303, and the coarse screen section 304, respectively, to ensure that the aggregate can be effectively separated according to particle size during the flow division process; the guide cylinder 502 and the drum screen 304 are also included. The screen 3 is coaxially arranged and connected to the flow divider 501, dividing the internal space of the drum screen 3 into multiple flow channels with a fan-shaped cross-section. The conical flow guide hood 503 is fixedly installed inside the drum screen 3 near the feed end, with its tip facing the feed end and the other end connected and fixed to the flow guide cylinder 502. The outer wall of the conical flow guide hood 503 is divided into multiple flow guide grooves corresponding to the flow channels by the partition 504, and the flow guide grooves are connected to the flow channels to achieve the initial dispersion and uniform distribution of aggregates.

[0021] The bottom of the frame 1 is provided with a first discharge chute 7, a second discharge chute 8, a third discharge chute 9, and a discharge chute 10. The first discharge chute 7, the second discharge chute 8, and the third discharge chute 9 are located below the fine screen section 302, the medium screen section 303, and the coarse screen section 304 of the drum screen 3, respectively, and are used to collect aggregates of the corresponding particle sizes. The discharge chute 10 is located at the bottom end of the drum screen 3 and is used to discharge large aggregate particles that fail to pass through any screen section. All discharge chute are connected through the frame 1 and extend to the outside to facilitate the collection and transportation of graded materials.

[0022] The drive mechanism 6 includes a motor 601 and a gear 602. The motor 601 is fixedly mounted on the frame 1, and the gear 602 is mounted on its output shaft. The gear 602 meshes with the gear ring 301 on the outer wall of the drum screen 3, thereby driving the drum screen 3 to rotate. The rotation speed of the drum screen 3 can be controlled by adjusting the speed of the motor 601 to adapt to the screening requirements of aggregates of different particle sizes.

[0023] The diversion plate 501 has multiple guide plates 505 evenly arranged along the length direction on its end face. The guide plates 505 are inclined along one side of the end of the drum screen 3, which can effectively guide the aggregate to move along the axial direction of the drum screen 3, avoid material accumulation, and improve the screening efficiency and grading effect of concrete aggregate.

[0024] The diameters of the sieve holes in the fine sieve section 302, medium sieve section 303, and coarse sieve section 304 on the inner wall of the drum screen 3 are set values ​​and increase sequentially.

[0025] Work process:

[0026] First, the recycled concrete aggregate to be graded enters the drum screen 3 through the feed hopper 2. Under gravity, the aggregate falls into the conical guide hood 503, where it is initially dispersed and evenly distributed onto the diversion plate 501 by the diversion channel. The mesh on the diversion plate 501 corresponds to the fine screen section 302, medium screen section 303, and coarse screen section 304 on the inner wall of the drum screen 3. Guided by the diversion plate 501, the aggregate enters the corresponding screen section. As the drum screen 3 rotates, the aggregate is subjected to the combined action of centrifugal force and gravity within the screen section. Aggregates meeting the particle size requirements pass through the screen holes and fall into the corresponding discharge chute, while aggregates that do not pass through the screen holes continue to move towards the end of the drum screen 3 along the guide plate 505 and are finally discharged through the discharge chute 10. This type of screen achieves multi-stage synchronous screening of aggregates during drum rotation by incorporating axially segmented fine, medium, and coarse screening sections within the drum screen, along with a gradually changing mesh design on the diverter plate. Simultaneously, the diverter plate and conical guide hood disperse the concrete aggregates, ensuring even distribution to each flow channel under centrifugal force. This reduces concrete accumulation at the bottom of the drum screen. The gradually changing mesh on the diverter plate surface creates a secondary dispersion mechanism, solving the problem of large aggregate accumulation at the bottom of traditional drum screens and significantly improving screening efficiency and grading effect. Furthermore, the dust cover design effectively reduces dust pollution, meeting green environmental protection requirements and making it suitable for various scales of recycled concrete aggregate production lines.

[0027] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A recycled concrete aggregate grading device, characterized in that: The aforementioned recycled concrete aggregate grading device includes a frame (1), a feed hopper (2), a drum screen (3), a dust cover (4), a material dispersion mechanism (5), and a drive mechanism (6). The dust cover (4) is fixedly installed on the frame (1). The drum screen (3) is cylindrical and is installed at both ends on the frame (1) at an incline via support wheels, and is located inside the dust cover (4). The feed hopper (2) is fixedly installed on the side of the dust cover (4) and extends to the inside of the drum screen (3). The outer wall of the drum screen (3) is provided with a gear ring (301) that is connected to the drive mechanism (6) for transmission. The inner wall of the drum screen (3) is provided with a fine screen section (302), a medium screen section (303), and a coarse screen section (304) with gradually increasing screen hole diameters along the axial direction. The drum screen (3) is also provided with a material dispersion mechanism (5) for uniformly distributing materials. The material dispersion mechanism (5) includes a diversion plate (501), a guide cylinder (501), and a flow guide (502). 502), a conical guide shroud (503) and a baffle (504), a flow divider (501) evenly distributed along the circumferential direction of the inner wall of the drum screen (3), and a mesh with gradually increasing diameter openings along the length direction on the surface of the flow divider (501), the mesh size corresponding to the fine screen section (302), the medium screen section (303) and the coarse screen section (304) respectively, the guide cylinder (502) is coaxially arranged with the drum screen (3) and connected to the flow divider (501), the drum screen (3) The interior is divided into multiple fan-shaped flow channels by the flow divider plate (501). The conical flow guide hood (503) is fixedly installed inside the drum screen (3) near the feed end. The tip of the conical flow guide hood (503) faces the feed end and the other end is connected and fixed to the flow guide cylinder (502). The outer wall of the conical flow guide hood (503) is divided into multiple flow guide grooves corresponding to the flow channels by the partition plate (504), and the flow guide grooves are connected to the flow channels.

2. The recycled concrete aggregate grading device as described in claim 1, characterized in that: The frame (1) is equipped with an inclined structure of a first discharge chute (7), a second discharge chute (8), a third discharge chute (9) and a discharge chute (10). The first discharge chute (7), the second discharge chute (8) and the third discharge chute (9) are located below the fine screen section (302), the medium screen section (303) and the coarse screen section (304) of the drum screen (3), respectively. The discharge chute (10) is located at the bottom of the end of the drum screen (3). The first discharge chute (7), the second discharge chute (8) and the third discharge chute (9) and the discharge chute (10) all penetrate the frame (1) and extend to the outside.

3. A recycled concrete aggregate grading device as described in claim 1 or 2, characterized in that: The drive mechanism (6) includes a motor (601) and a gear (602). The motor (601) is fixedly mounted on the frame (1), and a gear (602) that meshes with a gear ring (301) is mounted on its output shaft.

4. A recycled concrete aggregate grading device as described in claim 3, characterized in that: Multiple guide plates (505) are equidistantly arranged on the end face of the diverter plate (501) along the length direction, and the guide plates (505) are inclined along one side of the end of the drum screen (3).

5. A recycled concrete aggregate grading device as described in claim 1, characterized in that: The diameters of the sieve holes in the fine sieve section (302), medium sieve section (303) and coarse sieve section (304) of the inner wall of the drum screen (3) are set values ​​and increase sequentially.

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