Hemp fiber gradient separation device

Abstract

This utility model relates to the field of fiber grading technology, specifically a hemp fiber gradient separation device, including a cylinder, a feeding pipe, a screen cylinder, and a long fiber discharge assembly. The screen cylinder is rotatably installed on the inner bottom of the cylinder and extends through the cylinder to the bottom. A motor is located at the bottom of the screen cylinder, below the cylinder, for rotating the screen cylinder within the cylinder during operation. The feeding pipe is located on the side of the cylinder, and multiple feed pipes communicating with the cylinder and facing the screen cylinder are located on the side of the feeding pipe. The long fiber discharge assembly is installed at the top of the cylinder. This utility model delivers the pulp mixture under pressure to the surface of the screen cylinder through the feed pipes, causing the pulp mixture to form an upward vortex within the cylinder. Simultaneously, the screen cylinder rotates within the cylinder, allowing short fibers to enter the screen cylinder while long fibers are blocked outside. Multiple feed pipes are vertically arranged to supplement the kinetic energy of the vortex formed by the pulp mixture, thereby effectively separating short and long fibers and improving the separation effect.

Description

Technical Field

[0001] This utility model relates to the field of fiber grading technology, specifically to a gradient separation device for hemp fibers. Background Technology

[0002] Fiber grading is the process of classifying pulp fibers according to their thickness or length using sorting equipment. In the processing of bast fibers, grading sieves are used to separate long and short fibers in bast fibers, which is one method of grading bast fiber processing.

[0003] Chinese patent document CN213727648U discloses a novel fiber grading screen, including a cylinder. The cylinder includes a pulp inlet at the bottom and a long fiber outlet and a short fiber outlet at the top. A screen cylinder coaxial with the cylinder is disposed inside the cylinder. The screen cylinder is driven to rotate by a motor. The screen cylinder is a closed cylindrical screen cylinder at the top. The short fiber outlet is connected to the top of the screen cylinder through a short fiber pipe. A brush roller parallel to the axis of the screen cylinder is also disposed inside the cylinder. The brush roller is in contact with the outer wall of the screen cylinder.

[0004] However, in the above scheme, the slurry mixture is introduced into the grading screen tangentially through the inlet, forming an upward vortex liquid flow. During use, the pressurized delivery of the slurry mixture causes the liquid level to rise rapidly, and the kinetic energy of the liquid gradually weakens during the rise. At the same time, the screen cylinder is rotating, which prevents short fibers from entering the screen cylinder from the outside of the top, affecting the separation effect. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a gradient separation device for hemp fibers.

[0006] The technical solution of this utility model is: a hemp fiber gradient separation device, including a cylinder, a conveying pipe, a screen cylinder and a long fiber discharge assembly;

[0007] The screen cylinder is rotatably installed at the bottom of the inner side of the cylinder and extends through the cylinder to the bottom of the cylinder. The bottom of the screen cylinder, located below the cylinder, is equipped with a motor for rotating the screen cylinder in the cylinder during use.

[0008] The conveying pipe is located on the side of the cylinder, and the side of the conveying pipe is provided with multiple feed pipes that communicate with the cylinder and face the screen cylinder;

[0009] The long fiber discharge assembly is installed at the top of the cylinder, and the inside of the long fiber discharge assembly is provided with a short fiber discharge assembly that is sleeved on the outside of the top of the screen cylinder and passes through the long fiber discharge assembly.

[0010] Preferably, a convex ring is provided at the middle of the bottom end of the cylinder, and a sealed bearing is provided inside the convex ring. The bottom end of the screen cylinder is provided with a rotating shaft that is inserted into the bearing inside the convex ring and connected to the motor drive.

[0011] Preferably, multiple feed pipes are arranged at equal distances on the side of the conveying pipe, and all multiple feed pipes are arranged at an upward inclination on the side of the conveying pipe, with the ends of the feed pipes facing the screen cylinder.

[0012] Preferably, the long fiber discharge assembly includes a mounting housing and a first discharge pipe;

[0013] The mounting shell is bolted to the top of the cylinder; the inner diameter of the mounting shell gradually decreases along the height of the cylinder from the top of the cylinder.

[0014] The first feed pipe is installed at the top of the mounting shell and is connected to the mounting shell.

[0015] Preferably, the short fiber discharge assembly includes a second discharge pipe and a connecting shell;

[0016] The second discharge pipe is installed on one side of the middle of the mounting shell and one end extends to the inside of the mounting shell;

[0017] The connecting shell is installed at one end of the second discharge pipe and is inserted into the screen cylinder inside the mounting shell.

[0018] Preferably, a step is provided at the bottom edge of the connecting shell, and the screen cylinder is accommodated in the step when the connecting shell and the screen cylinder are installed together.

[0019] Preferably, a third discharge pipe is provided at the bottom end of the cylinder and at the edge, and the third discharge pipe is connected to the cylinder.

[0020] Preferably, a scraper is provided at the bottom of the screen cylinder, and the scraper is fitted and connected to the inner bottom of the cylinder.

[0021] Preferably, a connecting column is provided at the middle of the bottom inner side of the screen cylinder, and a spiral plate is provided on the outside of the connecting column to fit and connect with the inner wall of the screen cylinder.

[0022] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0023] This invention uses a feed pipe to pressurize and deliver a slurry mixture to the surface of a screen cylinder, creating an upward vortex within the cylinder. Simultaneously, the screen cylinder rotates within the cylinder, allowing short fibers to enter while long fibers are blocked outside. Multiple feed pipes are vertically arranged to supplement the vortex formed by the slurry mixture with kinetic energy, thereby effectively separating long and short fibers and improving the separation effect. Attached Figure Description

[0024] Figure 1-2All of these are perspective views of embodiments proposed in this utility model.

[0025] Figure 3 This is a cross-sectional schematic diagram of the cylindrical structure in the embodiments proposed in this utility model.

[0026] Figure 4 In the embodiments proposed by this utility model Figure 3 A schematic diagram of the structure at point A.

[0027] Figure 5 This is a cross-sectional schematic diagram of the connection structure between the connecting shell and the sieve cylinder in an embodiment of this utility model.

[0028] Figure 6 This is a top view of an embodiment of the present invention.

[0029] Reference numerals in the attached drawings: 1. Cylinder; 2. Conveying pipe; 3. Feed pipe; 4. Mounting shell; 5. First discharge pipe; 6. Second discharge pipe; 7. Motor; 8. Third discharge pipe; 9. Connecting shell; 10. Screen cylinder; 11. Spiral plate; 12. Connecting column; 13. Rotating shaft; 14. Scraper; 15. Convex ring; 16. Step. Detailed Implementation

[0030] Example 1

[0031] like Figure 1-6 As shown, the hemp fiber gradient separation device proposed in this utility model includes a cylinder 1, a conveying pipe 2, a screen cylinder 10, and a long fiber discharge assembly.

[0032] The screen cylinder 10 is rotatably installed at the bottom of the inner side of the cylinder body 1 and extends through the cylinder body 1 to the bottom of the cylinder body 1. The bottom of the screen cylinder 10 and located below the cylinder body 1 is provided with a motor 7 for rotating the screen cylinder 10 in the cylinder body 1 during use.

[0033] The conveying pipe 2 is located on the side of the cylinder 1. The side of the conveying pipe 2 is provided with multiple feed pipes 3 that are connected to the cylinder 1 and face the screen cylinder 10. During use, the slurry mixture is divided into multiple streams and enters the cylinder 1 tangentially under pressure, forming an upward vortex liquid flow, reducing the liquid movement distance and avoiding the gradual weakening of kinetic energy during the liquid movement. When the multiple feed pipes 3 are arranged vertically at equal distances, they can also be arranged at equal angles around the center of the cylinder 1.

[0034] The long fiber discharge assembly is installed at the top of the cylinder 1, and the inside of the long fiber discharge assembly is provided with a short fiber discharge assembly that is sleeved on the outside of the top of the screen cylinder 10 and passes through the long fiber discharge assembly.

[0035] In an optional embodiment, a convex ring 15 is provided at the middle of the bottom end of the cylinder 1, and a sealed bearing is provided inside the convex ring 15. The bottom end of the screen cylinder 10 is provided with a rotating shaft 13 that is inserted into the bearing inside the convex ring 15 and is connected to the motor 7 for transmission.

[0036] In an optional embodiment, a plurality of feed pipes 3 are arranged at equal distances along the vertical direction on the side of the conveying pipe 2, and the plurality of feed pipes 3 are all arranged at an upward inclination on the side of the conveying pipe 2, and the ends of the feed pipes 3 are arranged toward the side of the screen cylinder 10.

[0037] In this embodiment, the slurry mixture is conveyed to the feed pipe 3 through the feed pipe 2, and the feed pipe 3 pressurizes and conveys the slurry mixture into the cylinder 1. The orientation of the feed pipe 3 allows the slurry mixture to be directly conveyed to the surface of the screen cylinder 10, forming an upward vortex in the cylinder 1. At the same time, the motor 7 is started, and the motor 7 drives the screen cylinder 10 to rotate in the cylinder 1 via the rotating shaft 13, thereby allowing short fibers to enter the screen cylinder 10 and long fibers to be blocked outside the screen cylinder 10. Since there are multiple feed pipes 3, multiple feed pipes 3 simultaneously convey the slurry mixture to the screen cylinder 10, so that the vortex formed by the slurry mixture has kinetic energy supplementation, thereby effectively separating short fibers and long fibers. The short fibers are conveyed from the middle of the screen cylinder 10 to the short fiber discharge assembly and discharged to the outside, while the long fibers are conveyed from the outside of the screen cylinder 10 to the long fiber discharge assembly and discharged to the outside, thereby improving the separation effect.

[0038] Example 2

[0039] like Figure 3 As shown, the hemp fiber gradient separation device proposed in this utility model differs from the first embodiment in that the long fiber discharge assembly includes a mounting shell 4 and a first discharge pipe 5.

[0040] Mounting shell 4 is bolted to the top of cylinder 1; the inner diameter of mounting shell 4 gradually decreases along the height direction of cylinder 1 from cylinder 1 toward the top of cylinder 1.

[0041] The first discharge pipe 5 is installed at the top of the mounting shell 4 and is connected to the mounting shell 4.

[0042] In this embodiment, the long fiber mixture in the cylinder 1 is guided by the mounting shell 4, so that the long fiber mixture flows into the first discharge pipe 5. As the inner diameter of the mounting shell 4 gradually decreases, the flow rate of the long fiber mixture increases, further enhancing the separation effect and ensuring that the long fibers smoothly enter the first discharge pipe 5 and are discharged. At the same time, the bolted connection between the mounting shell 4 and the cylinder 1 makes the inspection and maintenance of the screen cylinder 10 more convenient.

[0043] Example 3

[0044] like Figure 3 and Figure 5 As shown, the hemp fiber gradient separation device proposed in this utility model differs from Embodiment 1 in that the short fiber discharge assembly includes a second discharge pipe 6 and a connecting shell 9.

[0045] The second discharge pipe 6 is installed on one side of the middle part of the mounting shell 4 and one end extends to the inside of the mounting shell 4.

[0046] The connecting shell 9 is installed at one end of the second discharge pipe 6 and is located inside the mounting shell 4 and inserted into the screen cylinder 10.

[0047] In an optional embodiment, a step 16 is provided at the bottom edge of the connecting shell 9. When the connecting shell 9 and the screen cylinder 10 are installed together, the screen cylinder 10 is accommodated in the step 16, which is used to improve the connection and sealing effect between the connecting shell 9 and the screen cylinder 10 during use.

[0048] In this embodiment, the top of the screen cylinder 10 is sealed by the connecting shell 9, and the connecting shell 9 guides the short fiber mixture inside the screen cylinder 10 to the second discharge pipe 6, which then transports it outward, ensuring that the short fiber mixture is discharged smoothly.

[0049] Example 4

[0050] like Figure 2-3 As shown, the difference between this embodiment and the first embodiment of the hemp fiber gradient separation device proposed by this utility model is that a third discharge pipe 8 is provided at the bottom end of the cylinder 1 and at the edge. The third discharge pipe 8 is connected to the cylinder 1. In use, a sealing structure, such as a valve or a baffle plate, can be installed at the end of the third discharge pipe 8.

[0051] In an optional embodiment, a scraper 14 is provided at the bottom end of the screen cylinder 10. The scraper 14 is attached to the inner bottom end of the cylinder body 1 and is used to push the impurities deposited at the inner bottom end of the cylinder body 1 towards the third discharge pipe 8 by the rotation of the screen cylinder 10 during use, so that the third discharge pipe 8 discharges them.

[0052] In this embodiment, the sieve cylinder 10 drives the scraper 14 to move the heavier impurities deposited inside the cylinder 1 to the third discharge pipe 8, and the third discharge pipe 8 discharges them, ensuring that the inside of the device is clean.

[0053] Example 5

[0054] like Figure 3 As shown, the difference between this embodiment and the first embodiment of the hemp fiber gradient separation device proposed by this utility model is that a connecting column 12 is provided in the middle of the bottom inner side of the sieve cylinder 10, and a spiral plate 11 that is in close contact with the inner wall of the sieve cylinder 10 is provided on the outer side of the connecting column 12.

[0055] In this embodiment, the connecting column 12 is rotated by the screen cylinder 10, so that the connecting column 12 drives the spiral plate 11 to rotate synchronously with the screen cylinder 10 in the screen cylinder 10, thereby causing the spiral plate 11 to push the short fiber mixture upward, increasing the movement speed of the short fiber mixture and increasing the discharge speed of the short fibers.

[0056] In this invention, the slurry mixture is conveyed to the feed pipe 3 via the feed pipe 2, and the feed pipe 3 pressurizes and delivers the mixture into the cylinder 1. The orientation of the feed pipe 3 ensures that the slurry mixture is directly conveyed to the surface of the screen cylinder 10, creating an upward vortex within the cylinder 1. Simultaneously, the motor 7 is activated, causing the screen cylinder 10 to rotate within the cylinder 1 via the rotating shaft 13. This allows short fibers to enter the screen cylinder 10, while long fibers are blocked outside. Multiple feed pipes 3 simultaneously deliver the slurry mixture to the screen cylinder 10, providing additional kinetic energy to the vortex formed by the slurry mixture, thus promoting the interaction between short and long fibers. The fibers are effectively separated, and the screen cylinder 10 drives the connecting column 12 to rotate, so that the connecting column 12 drives the spiral plate 11 to rotate synchronously with the screen cylinder 10. This causes the spiral plate 11 to push the short fiber mixture upward and guide it to the second discharge pipe 6 through the connecting shell 9. The mixture is then transported outward through the second discharge pipe 6, and the long fiber mixture is collected in the mounting shell 4. The mounting shell 4 guides it to the first discharge pipe 5, where it is separated and discharged. This ensures efficient separation of long and short fibers and improves the operating efficiency of the device. At the same time, the screen cylinder 10 drives the scraper 14 to move the heavier impurities deposited inside the cylinder 1 to the third discharge pipe 8, which then discharges them, ensuring the cleanliness of the device.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A hemp fiber gradient separation device, characterized in that, It includes a cylinder (1), a conveying pipe (2), a screen cylinder (10), and a long fiber discharge assembly; The screen cylinder (10) is rotatably installed at the bottom of the inner side of the cylinder (1) and extends through the cylinder (1) to the bottom of the cylinder (1). A motor (7) is provided at the bottom of the screen cylinder (10) and below the cylinder (1) for rotating the screen cylinder (10) in the cylinder (1) during use. The conveying pipe (2) is set on the side of the cylinder (1), and the side of the conveying pipe (2) is provided with multiple feed pipes (3) that communicate with the cylinder (1) and face the screen cylinder (10); The long fiber discharge assembly is installed at the top of the cylinder (1), and the inside of the long fiber discharge assembly is provided with a short fiber discharge assembly that is sleeved on the outside of the top of the screen cylinder (10) and passes through the long fiber discharge assembly.

2. The hemp fiber gradient separation device according to claim 1, characterized in that, A convex ring (15) is provided at the middle of the bottom end of the cylinder (1). The inner side of the convex ring (15) has a sealed bearing. The bottom end of the screen cylinder (10) is provided with a rotating shaft (13) that is inserted into the bearing inside the convex ring (15) and is connected to the motor (7) for transmission.

3. The hemp fiber gradient separation device according to claim 1, characterized in that, Multiple feed pipes (3) are arranged at equal distances on the side of the conveying pipe (2), and the multiple feed pipes (3) are all arranged upward on the side of the conveying pipe (2), and the ends of the feed pipes (3) are arranged on the side facing the screen cylinder (10).

4. The hemp fiber gradient separation device according to claim 1, characterized in that, The long fiber discharge assembly includes a mounting shell (4) and a first discharge pipe (5); The mounting shell (4) is bolted to the top of the cylinder (1); the inner diameter of the mounting shell (4) gradually decreases from the top of the cylinder (1) towards the top of the cylinder (1) along the height direction of the cylinder (1); The first discharge pipe (5) is installed at the top of the mounting shell (4) and is connected to the mounting shell (4).

5. The hemp fiber gradient separation device according to claim 4, characterized in that, The short fiber discharge assembly includes a second discharge pipe (6) and a connecting shell (9); The second discharge pipe (6) is installed on one side of the middle part of the mounting shell (4) and one end extends to the inside of the mounting shell (4); The connecting shell (9) is installed at one end of the second discharge pipe (6) and is located inside the mounting shell (4) and inserted into the screen cylinder (10).

6. The hemp fiber gradient separation device according to claim 5, characterized in that, A step (16) is provided at the bottom edge of the connecting shell (9). When the connecting shell (9) and the screen cylinder (10) are installed together, the screen cylinder (10) is accommodated in the step (16).

7. The hemp fiber gradient separation device according to claim 1, characterized in that, A third discharge pipe (8) is provided at the bottom end of the cylinder (1) and at the edge, and the third discharge pipe (8) is connected to the cylinder (1).

8. The hemp fiber gradient separation device according to claim 1, characterized in that, A scraper (14) is provided at the bottom of the sieve cylinder (10), and the scraper (14) is attached to the bottom inner side of the cylinder body (1).

9. The hemp fiber gradient separation device according to claim 1, characterized in that, A connecting column (12) is provided at the middle of the bottom inner side of the screen cylinder (10), and a spiral plate (11) is provided on the outside of the connecting column (12) to be in close contact with the inner wall of the screen cylinder (10).

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