A soil screening device

Abstract

This utility model discloses a soil screening device, including a screening cylinder and a screen structure inside it. A feeding cylinder is located inside the screening cylinder along its central axis, and a material lifting component is installed inside the feeding cylinder to lift the soil from its bottom to the discharge end. The screen structure includes a first filter cylinder and several guide plates. The first filter cylinder is rotatably installed inside the screening cylinder, allowing it to switch the soil discharge point at the same location in real time during rotation, achieving rotary screening and preventing localized soil accumulation. Simultaneously, the axial section of the first filter cylinder is set to an "U" shape, forming a columnar discharge channel between it and the feeding cylinder. This allows large soil particles and stones to be discharged through the columnar discharge channel, achieving automatic slag removal. Compared to previous static screen screening methods, this reduces wear on the screen from hard solids and avoids mesh clogging.

Description

Technical Field

[0001] This utility model relates to the field of screening technology, specifically a soil screening device. Background Technology

[0002] Most existing dry screening methods involve directly pouring soil onto the screen surface or using a conveyor for uniform feeding, followed by a vibrating motor driving the screen for screening. However, the soil feeding point on the screen remains almost constant, which easily leads to localized soil accumulation, reducing the screening efficiency of the screen. Furthermore, large soil particles and impurities filtered onto the screen surface cannot be automatically discharged (the accumulated soil is pressed to the bottom). In particular, hard solids such as stones mixed in with the soil not only clog the mesh at the bottom, further reducing screening efficiency, but also cause wear and tear on the screen, affecting its service life. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a soil screening device to solve the technical problems mentioned in the prior art.

[0004] A soil screening device includes a screening cylinder and a screen structure located inside it. The screening cylinder has a hollow interior. A feeding cylinder is arranged inside the screening cylinder and along its central axis. The discharge end of the feeding cylinder extends to the top of the inner wall of the screening cylinder. A feeding port is provided at the bottom of the outer periphery of the feeding cylinder. A hopper is connected to the feeding port of the feeding cylinder. The hopper is located outside the screening cylinder, and its discharge end is inclined downward. The feeding cylinder is equipped with a material lifting component, which is used to lift the soil in the feeding cylinder from its bottom to the discharge end for discharge. The screen structure includes a first filter cylinder and several guide plates. The first filter cylinder is rotatably installed inside the screening cylinder and located on the outer periphery of the feeding cylinder. The axial section of the first filter cylinder is set as a "﹞" shaped structure. A cylindrical feeding channel is formed between the inner side wall of the first filter cylinder and the outer side wall of the feeding cylinder. The bottom of the cylindrical feeding channel extends to the bottom of the first filter cylinder and a collecting plate is provided. The opposite sides of the collecting plate extend to connect with the inner wall of the screening cylinder and the outer periphery of the feeding cylinder, respectively, forming a collecting trough at the bottom of the first filter cylinder. A first screening groove is formed between the outer wall of the first filter cylinder and the inner wall of the screening cylinder, and the bottom of the first screening groove is a sealed structure. The guide plate is rotatably or fixedly connected within the cylindrical feeding channel and is arranged in a spiral shape.

[0005] Optionally, the material lifting assembly includes: A rotating shaft is coaxially installed inside the feeding cylinder. One end of the shaft is rotatably connected to the bottom of the inner wall of the feeding cylinder, and the other end passes through the top wall of the screening cylinder and is connected to the output shaft of the power unit. The power unit is used to drive the rotating shaft to rotate. A spiral plate is disposed inside the feeding cylinder and mounted on the rotating shaft. One end of the spiral plate extends below the feed inlet of the feeding cylinder, and the other end extends above the discharge end of the feeding cylinder.

[0006] Optionally, the screen structure is mounted on the rotating shaft via a connecting assembly, the connecting assembly comprising: A baffle plate is coaxially mounted on the rotating shaft and located above the spiral plate; Multiple sets of connecting plates are arranged in an array along the axial direction of the baffle plate, and their two ends are connected to the baffle plate and the filter cartridge, respectively.

[0007] Optionally, the screen structure further includes a second filter cylinder, which is annularly mounted on the outer periphery of the feeding cylinder and forms a second screening groove between opposite sides of its sidewalls. The top of the second filter cylinder is located in the cylindrical feeding channel and is rotatably connected to the guide plate. The bottom of the second filter cylinder extends through the collecting plate, and the second screening groove communicates with the bottom of the inner wall of the screening cylinder.

[0008] Optionally, the bottom of the screening cylinder is conical and is provided with a discharge port; The bottom of the feeding cylinder is located above the discharge port. Multiple sets of tension ribs are installed in a ring array on the outer periphery of the feeding cylinder, and the other end of the tension ribs is connected to the inner wall of the screening cylinder.

[0009] Optionally, the collecting plate is inclined, and a slag discharge port is provided on the outer periphery of the screening cylinder at the bottom end of the collecting plate.

[0010] Optionally, the bottom of the screening cylinder is provided with at least three sets of supporting columns.

[0011] Optionally, at least two sets of guide plates are provided in the cylindrical feeding channel, and two adjacent sets of guide plates are arranged in a stepped spiral pattern to form a spiral feeding path between their adjacent surfaces. The flow diameter of the spiral feeding path is greater than the maximum particle size of the soil.

[0012] Optionally, a support platform is provided at the bottom of the first filter cylinder, and the support platform is installed on the inner side wall of the screening cylinder.

[0013] The beneficial effects that this utility model can produce include: This invention provides a soil screening device that, by rotatably installing a first filter cylinder inside a screening cylinder, allows for real-time switching of the soil feeding point at the same location during rotation, achieving rotary screening and preventing localized soil accumulation. Simultaneously, the first filter cylinder's axial cross-section is designed as an "U" shape, forming a cylindrical feeding channel with the feeding cylinder. This channel allows for the discharge of large soil particles and stones, achieving automatic slag removal. Compared to traditional static screen screening methods, this reduces wear on the screen from hard solids and prevents mesh clogging. Furthermore, the guide plate is spirally arranged within the cylindrical feeding channel, extending the soil's fall time and allowing for secondary screening during the rotational descent, thus improving the screening efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a soil screening device according to the present invention; Figure 2 In this utility model Figure 1 A schematic diagram of the transverse cross-sectional structure of the screening structure; In the diagram: 1. Screening cylinder, 2. Feeding cylinder, 3. Hopper, 4. First filter cylinder, 5. Columnar discharge channel, 6. Collecting plate, 7. Collecting trough, 8. First screening trough, 9. Guide plate, 10. Rotating shaft, 11. Spiral plate, 12. Power unit, 13. Baffle plate, 14. Connecting plate, 15. Second filter cylinder, 16. Second screening trough, 17. Tension rib, 18. Slag discharge port, 19. Support column, 20. Spiral feeding path, 21. Support platform. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1As shown, this utility model provides a soil screening device, including a screening cylinder 1 and a screen structure located inside it. The screening cylinder 1 has a hollow interior. A feeding cylinder 2 is arranged inside the screening cylinder 1 along the central axis. The discharge end of the feeding cylinder 2 extends to the top of the inner wall near the screening cylinder 1. A feeding port is opened at the bottom of the outer periphery of the feeding cylinder 2. A hopper 3 is connected to the feeding port of the feeding cylinder 2. The hopper 3 is located outside the screening cylinder 1, and its discharge end is inclined downward to facilitate the centralized addition of soil to be screened into the feeding cylinder 2. A material lifting component is provided inside the feeding cylinder 2 to lift the soil in the feeding cylinder 2 from its bottom to the discharge end for discharge. The screen structure includes a first filter cylinder 4 and several guide plates 9. The first filter cylinder 4 is rotatably installed inside the screening cylinder 1 and located on the outer periphery of the feeding cylinder 2. When the first filter cylinder 4 rotates, the discharge point of the soil at the same location can be switched in real time to achieve rotary screening and avoid local material accumulation. The first filter cylinder 4 has an axial section of a "﹞" shape. A cylindrical discharge channel 5 is formed between the inner wall of the first filter cylinder 4 and the outer wall of the feeding cylinder 2. The bottom of the cylindrical discharge channel 5 extends to the bottom of the first filter cylinder 4 and is equipped with a collecting plate 6. The opposite sides of the collecting plate 6 extend to connect with the inner wall of the screening cylinder 1 and the outer periphery of the feeding cylinder 2, forming a collecting trough 7 at the bottom of the first filter cylinder 4. This allows large particles of soil and stones to be discharged through the cylindrical discharge channel 5, achieving automatic slag discharge. Compared with the previous static screen screening method, this method is more efficient. This reduces wear on the screen from hard solids and prevents clogging of the mesh. A first screening trough 8 is formed between the outer wall of the first filter cylinder 4 and the inner wall of the screening cylinder 1. The bottom of the first screening trough 8 is a sealed structure, which facilitates the collection and storage of fine soil particles obtained from screening and prevents them from falling into the bottom of the first filter cylinder 4 and mixing with the filtered impurities. The guide plate 9 is rotatably or fixedly connected in the columnar feeding channel 5 and is arranged in a spiral shape, which can prolong the falling time of the soil and allow it to be screened again during the rotating falling process, thereby improving the screening effect.

[0017] Furthermore, such as Figure 1 As shown, the material lifting assembly includes a rotating shaft 10, a spiral plate 11, and a power unit 12 (using a motor). The rotating shaft 10 is coaxially installed inside the feeding cylinder 2. One end of the rotating shaft 10 is rotatably connected to the bottom of the inner wall of the feeding cylinder 2 through a bearing, and the other end passes through the top wall of the screening cylinder 1 and is connected to the output shaft of the power unit 12. The power unit 12 is used to drive the rotating shaft 10 to rotate. The spiral plate 11 is located inside the feeding cylinder 2 and is installed on the rotating shaft 10. One end of the spiral plate 11 extends below the feed inlet of the feeding cylinder 2, and the other end extends above the discharge end of the feeding cylinder 2. Thus, during the rotating feeding process, the soil is dispersed on the surface of the first filter cylinder 4 under the action of centrifugal force, achieving uniform feeding and thus avoiding soil accumulation, achieving the effect of rapid screening.

[0018] Furthermore, such as Figure 1As shown, the screen structure is fixedly installed on the rotating shaft 10 by a connecting assembly, which includes a baffle plate 13 and multiple sets of connecting plates 14. The baffle plate 13 is coaxially installed on the rotating shaft 10 and located above the spiral plate 11 to shield the soil and ensure that the soil falls fully onto the surface of the first filter cylinder 4 for rapid screening. The multiple sets of connecting plates 14 are arranged in an array along the axial direction of the baffle plate 13, and their two ends are connected to the baffle plate 13 and the filter cylinder respectively, thereby driving the screen structure to rotate synchronously during the feeding process to ensure the timely start-up of the screen structure.

[0019] Furthermore, such as Figure 1 As shown, the screen structure also includes a second filter cylinder 15. The second filter cylinder 15 is fixedly installed on the outer periphery of the feeding cylinder 2 in a ring shape, and a second screening groove 16 is formed between the opposite sides of its side walls. The top of the second filter cylinder 15 is located in the cylindrical feeding channel 5 and is rotatably connected to the guide plate 9. The bottom of the second filter cylinder 15 extends to the through-collecting plate 6. The second screening groove 16 is connected to the bottom of the inner wall of the screening cylinder 1. Thus, by setting screening grooves on both opposite sides of the cylindrical feeding channel 5, the soil screening effect can be further improved.

[0020] Furthermore, such as Figure 1 As shown, the bottom of the screening cylinder 1 is conical and has a discharge port. The bottom of the feeding cylinder 2 is located above the discharge port. Multiple sets of tension ribs 17 are installed in a ring array on the outer periphery of the feeding cylinder 2. The other end of the tension ribs 17 is connected to the inner wall of the screening cylinder 1 to prevent the feeding cylinder 2 from obstructing the discharge port and to facilitate material discharge. At the same time, at least three sets of support columns 19 are provided at the bottom of the screening cylinder 1 to raise the screening cylinder 1 to a certain height for easy installation of the receiving container. In the above, a discharge port is opened at the lowest end of the first screening trough 8, which facilitates the automatic unloading of soil in the first screening trough 8 by throwing it out during the rotation of the first filter cylinder 4. In addition, to ensure the unloading effect, a set of scraper plates can be installed at an angle on one side of the discharge port. One end of the scraper plate extends along the inclined surface to abut the outer periphery of the first screening trough 8, so that the first filter cylinder 4 can continuously transport the screened soil to one side of the scraper plate for guiding and discharge during the rotation of the first filter cylinder 4.

[0021] Furthermore, such as Figure 1 As shown, the collection plate 6 is inclined, and a slag discharge port 18 is provided on the outer periphery of the screening cylinder 1 at the bottom of the collection plate 6, which facilitates the cleaning of large soil particles and impurities such as stones collected in the collection trough 7.

[0022] Furthermore, such as Figure 2 As shown, at least two sets of guide plates 9 are provided in the cylindrical feeding channel 5. The two adjacent sets of guide plates 9 are arranged in a stepped spiral pattern and form a spiral feeding path 20 between their adjacent surfaces. The flow diameter of the spiral feeding path 20 is greater than the maximum particle size of the soil to ensure smooth soil feeding.

[0023] Furthermore, such as Figure 1 As shown, a support platform 21 is provided at the bottom of the first filter cylinder 4. The support platform 21 is fixedly installed on the inner side wall of the screening cylinder 1 and is used to support and limit the first filter cylinder 4.

Claims

1. A soil screening device, comprising a screening cylinder (1) and a screen structure located inside therein, characterized in that, The screening cylinder (1) has a hollow structure inside. A feeding cylinder (2) is provided inside the screening cylinder (1) and located in the direction of the central axis. The discharge end of the feeding cylinder (2) extends to the top of the inner wall of the screening cylinder (1). A feeding port is provided at the bottom of the outer periphery of the feeding cylinder (2). A hopper (3) is connected to the feeding port of the feeding cylinder (2). The hopper (3) is located outside the screening cylinder (1) and its discharge end is inclined downward. The feeding cylinder (2) is equipped with a material lifting component, which is used to lift the soil in the feeding cylinder (2) from its bottom to the discharge end for discharge; The screen structure includes a first filter cylinder (4) and several guide plates (9). The first filter cylinder (4) is rotatably installed inside the screening cylinder (1) and located on the outer periphery of the feeding cylinder (2). The axial section of the first filter cylinder (4) is set as a "﹞" shaped structure. A columnar feeding channel (5) is formed between the inner side wall of the first filter cylinder (4) and the outer side wall of the feeding cylinder (2). The bottom of the columnar feeding channel (5) extends to the bottom of the first filter cylinder (4) and a collecting plate (6) is provided. The opposite sides of the collecting plate (6) extend to connect with the inner wall of the screening cylinder (1) and the outer periphery of the feeding cylinder (2). A collecting trough (7) is formed at the bottom of the first filter cylinder (4). A first screening groove (8) is formed between the outer side wall of the first filter cylinder (4) and the inner side wall of the screening cylinder (1), and the bottom of the first screening groove (8) is a sealed structure. The guide plate (9) is rotatably or fixedly connected within the cylindrical feeding channel (5) and is arranged in a spiral shape.

2. The soil screening device according to claim 1, characterized in that, The material lifting component includes: A rotating shaft (10) is coaxially installed inside the feeding cylinder (2). One end of the shaft is rotatably connected to the bottom of the inner wall of the feeding cylinder (2), and the other end passes through the top wall of the screening cylinder (1) and is connected to the output shaft of the power unit (12). The power unit (12) is used to drive the rotating shaft (10) to rotate. A spiral plate (11) is disposed inside the feed cylinder (2) and installed on the rotating shaft (10). One end of the spiral plate (11) extends to the lower part of the feed inlet of the feed cylinder (2) and the other end extends to the upper part of the discharge end of the feed cylinder (2).

3. A soil screening device according to claim 2, characterized in that, The screen structure is mounted on the rotating shaft (10) via a connecting assembly, the connecting assembly comprising: The baffle plate (13) is coaxially mounted on the rotating shaft (10) and located above the spiral plate (11); Multiple sets of connecting plates (14) are arranged in an array along the axial direction of the baffle plate (13), and their two ends are respectively connected to the baffle plate (13) and the filter cartridge.

4. A soil screening device according to claim 1, characterized in that, The screen structure also includes a second filter cylinder (15), which is annularly installed on the outer periphery of the feeding cylinder (2) and forms a second screening groove (16) between the opposite sides of its sidewalls. The top of the second filter cylinder (15) is located in the cylindrical feeding channel (5) and is rotatably connected to the guide plate (9). The bottom of the second filter cylinder (15) extends through the collecting plate (6). The second screening groove (16) is connected to the bottom of the inner wall of the screening cylinder (1).

5. A soil screening device according to claim 4, characterized in that, The bottom of the screening cylinder (1) is conical and has a discharge port; The bottom of the feeding cylinder (2) is located above the discharge port. Multiple sets of tension ribs (17) are installed in a ring array on the outer periphery of the feeding cylinder (2). The other end of the tension ribs (17) is connected to the inner wall of the screening cylinder (1).

6. A soil screening device according to claim 1, characterized in that, The collecting plate (6) is inclined, and a slag discharge port (18) is provided on the outer periphery of the screening cylinder (1) at the bottom end of the collecting plate (6).

7. A soil screening device according to claim 1, characterized in that, The bottom of the screening cylinder (1) is provided with at least three sets of support columns (19).

8. A soil screening device according to claim 1, characterized in that, At least two sets of guide plates (9) are provided in the cylindrical feeding channel (5). The two adjacent sets of guide plates (9) are arranged in a stepped spiral and a spiral feeding path (20) is formed between their adjacent surfaces. The flow diameter of the spiral feeding path (20) is greater than the maximum particle size of the soil.

9. A soil screening device according to claim 1, characterized in that, The bottom of the first filter cylinder (4) is provided with a support platform (21), which is installed on the inner side wall of the screening cylinder (1).

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