A bran particle size classification screen

Abstract

The utility model discloses a bran particle size grading screen belongs to grain processing machinery technical field, including box and grading assembly, and one end of grading assembly is rotatoryly connected in the inner wall of box through rotary lever, and the other end is provided with drive assembly and buffer assembly in cooperation, and drive assembly includes motor and cam, and the bottom of grading assembly is periodically pushed by cam, and buffer assembly includes fixed plate fixedly connected in the inner wall of box, movable plate fixedly connected in grading assembly and spring connected between both, and the spring elasticity direction is contrary with the pushing direction of cam. The utility model solves the problem of uneven screen vibration and low screening efficiency in the prior art through the pushing of drive assembly and the reset of buffer assembly, and has the beneficial effects of simple and reliable structure, uniform and stable vibration of each layer screen, high screening efficiency and precision.

Description

Technical Field

[0001] This utility model relates to the field of grain processing machinery technology, and in particular to a bran particle size grading sieve. Background Technology

[0002] Wheat bran is a major byproduct of grain processing. Depending on its particle size, it has different applications, and therefore usually needs to be graded before further use. A vibrating screen is a common device for this grading process. It causes the bran material to move, jump, and separate into layers on the screen surface by generating high-frequency vibrations, thus separating particles of different sizes.

[0003] To achieve precise grading, existing vibrating screens typically employ a multi-layered screen structure. In practical applications, the key to ensuring effective screening lies in driving these multiple screens to vibrate efficiently and uniformly. A common approach is to drive the entire screen box to vibrate as a whole, then transmit the vibration to each internal screen layer. However, in this transmission method, energy attenuates gradually during transmission, easily leading to greater vibration amplitude in the upper screen layers than in the lower layers. This uneven vibration affects the screening efficiency of the lower screen layers and can even cause material to clog the screen openings.

[0004] To overcome the problem of uneven vibration, some systems employ more complex transmission mechanisms, attempting to provide independent driving force for each layer of screen. However, this often results in a complex and bulky equipment structure, increasing manufacturing costs and maintenance difficulty. Furthermore, it makes it difficult to ensure synchronization and coordination between multiple drive components, thereby reducing the overall operational reliability of the equipment.

[0005] Therefore, this invention proposes a bran particle size grading sieve to address the shortcomings of existing technologies. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a bran particle size grading sieve, which aims to improve the problem of uneven vibration and low screening efficiency caused by poor coordination between the drive structure and screen vibration of existing screening devices.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a bran particle size grading sieve, comprising: a box body, a grading component, a driving component, and a buffer component. The box body includes a top plate and a bottom plate. The grading component has a first end and a second end. The first end is rotatably connected to the inner wall of the box body via a rotating rod, and the second end can swing up and down inside the box body.

[0008] The drive assembly and the buffer assembly are cooperatingly arranged at the second end of the grading assembly. The drive assembly includes a motor and a cam driven by the motor to rotate. The profile surface of the cam is configured to periodically abut and push against the bottom of the second end of the grading assembly. The buffer assembly includes a fixed plate fixedly connected to the inner wall of the box, a movable plate fixedly connected to the side wall of the second end of the grading assembly, and a spring connected between the fixed plate and the movable plate. The spring force is opposite to the pushing direction of the cam.

[0009] Preferably, the grading component includes a large particle screen, a medium particle screen, and a fine particle screen arranged at intervals from top to bottom; the driving component includes a plurality of cams respectively arranged below the large particle screen, the medium particle screen, and the fine particle screen.

[0010] Preferably, the drive assembly further includes a drive wheel, a first driven wheel, a second driven wheel, and a third driven wheel, as well as a first rotating shaft, a second rotating shaft, and a third rotating shaft for mounting the cam. The drive wheel drives the first driven wheel via a belt, the first driven wheel drives the second driven wheel via a belt, and the second driven wheel drives the third driven wheel via a belt. The first rotating shaft, the second rotating shaft, and the third rotating shaft are coaxially fixedly connected to the third driven wheel, the second driven wheel, and the first driven wheel, respectively, and drive the large particle screen, the medium particle screen, and the fine particle screen accordingly.

[0011] Preferably, the buffer assembly further includes a guide rod, the upper and lower ends of which are fixedly connected to the bottom of the top plate and the top of the bottom plate, respectively, and the guide rod passes through the movable plate, the spring and the fixed plate.

[0012] Preferably, a feeding hopper is fixedly connected to the top of the top plate.

[0013] Preferably, a receiving box is provided below the base plate.

[0014] Preferably, the bottom of the box is fixedly connected to a support leg.

[0015] This utility model has the following beneficial effects:

[0016] 1. This utility model solves the problems of uneven vibration and low screening efficiency of multi-layer screens in the prior art by setting up a structure in which multiple cams independently drive each layer of screen on one side and spring buffer assembly coordinates the reset on the other side. It achieves the effect of making the vibration of each layer of screen uniform and stable, and significantly improving the efficiency and accuracy of bran grading.

[0017] 2. This utility model solves the problems of complex drive structure and high failure rate of some screening devices in the prior art by adopting a pure mechanical linkage method of single power source driving cam push and spring assisted reset, and achieves the effect of compact structure, reliable transmission and easy maintenance. Attached Figure Description

[0018] Figure 1This is a perspective view of a bran particle size grading sieve proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the box of a bran particle size grading sieve proposed in this utility model;

[0020] Figure 3 This is a schematic diagram of the grading component of a bran particle size grading sieve proposed in this utility model;

[0021] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0022] Figure 5 This is a schematic diagram of the drive assembly of a bran particle size grading sieve proposed in this utility model.

[0023] Legend:

[0024] 1. Support leg; 2. Base plate; 3. Grading component; 301. Large particle screen; 302. Medium particle screen; 303. Fine particle screen; 304. Rotating rod; 4. Box body; 5. Top plate; 6. Feed hopper; 7. Drive component; 701. Motor; 702. Drive wheel; 703. First driven wheel; 704. Second driven wheel; 705. Third driven wheel; 706. Cam; 707. First rotating shaft; 708. Second rotating shaft; 709. Third rotating shaft; 8. Receiving box; 9. Guide rod; 10. Buffer component; 1001. Movable plate; 1002. Spring; 1003. Fixed plate. Detailed Implementation

[0025] 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.

[0026] Reference Figures 1-4 An embodiment of this utility model is provided: a bran particle size grading sieve, including a box 4 supported by a support leg 1. The box 4 includes a top plate 5 and a bottom plate 2. A grading component 3 is provided inside the box 4. The grading component 3 has a first end and a second end that can swing up and down inside the box 4. The first end of the grading component 3 is rotatably connected to the inner wall of the box 4 by a rotating rod 304, so that the second end of the grading component 3 can swing around the first end.

[0027] A drive component 7 and a buffer component 10 are also provided at the second end of the grading component 3. The drive component 7 is located below the second end of the grading component 3 and is used to provide an upward driving force. The buffer component 10 is located on one side of the second end of the grading component 3 and is used to provide a restoring force opposite to the driving force. The two work together to enable the second end of the grading component 3 to reciprocate stably.

[0028] The drive assembly 7 includes a motor 701 and a cam 706 driven by the motor 701 to rotate. The contour surface of the cam 706 can periodically abut against and push the bottom of the second end of the grading assembly 3 upward, thereby driving the second end of the grading assembly 3 to move upward. The buffer assembly 10 includes a fixed plate 1003 fixedly connected to the inner wall of the housing 4, a movable plate 1001 fixedly connected to the side wall of the second end of the grading assembly 3, and a spring 1002 connected between the fixed plate 1003 and the movable plate 1001. When the cam 706 pushes the grading assembly 3 upward, the spring 1002 is stretched or compressed to store energy. When the cam 706 rotates and stops pushing, the elastic force of the spring 1002 is released, causing the second end of the grading assembly 3 to quickly return to its original position downward. The direction of the elastic force of the spring 1002 is opposite to the pushing direction of the cam 706. This cycle repeats to achieve efficient vibration.

[0029] The grading component 3 includes a large-particle sieve 301, a medium-particle sieve 302, and a fine-particle sieve 303 arranged at intervals from top to bottom, allowing materials to be screened step by step. The large-particle sieve 301 has the largest sieve openings, used to separate the largest bran particles, followed by the medium-particle sieve 302, and the fine-particle sieve 303 has the smallest sieve openings, thus achieving fine grading of bran of different particle sizes. The drive component 7 includes multiple cams 706, which are respectively located below the large-particle sieve 301, the medium-particle sieve 302, and the fine-particle sieve 303. Each sieve is driven by an independent cam 706, ensuring that each layer of sieves receives a direct and independent driving force, thereby ensuring sufficient and consistent vibration of each layer of sieves. The drive component 7 also includes a driving wheel 702, a first driven wheel 703, and a second driven wheel. 704 and the third driven wheel 705, and the first rotating shaft 707, the second rotating shaft 708 and the third rotating shaft 709 respectively for mounting the cam 706; the motor 701 drives the driving wheel 702 to rotate, the driving wheel 702 drives the first driven wheel 703 through the belt, the first driven wheel 703 drives the second driven wheel 704 through the belt, and the second driven wheel 704 drives the third driven wheel 705 through the belt; the first rotating shaft 707, the second rotating shaft 708 and the third rotating shaft 709 are coaxially fixedly connected to the third driven wheel 705, the second driven wheel 704 and the first driven wheel 703 respectively, and the cam 706 fixed on these rotating shafts respectively drives the large particle screen 301, the medium particle screen 302 and the fine particle screen 303, so that a single power source can drive all screens to vibrate in an orderly manner;

[0030] To ensure the stability of the second end movement of the grading component 3 and prevent its deflection, the buffer component 10 also includes a guide rod 9. The upper and lower ends of the guide rod 9 are fixedly connected to the bottom of the top plate 5 and the top of the bottom plate 2, respectively. The guide rod 9 passes through the movable plate 1001, the spring 1002 and the fixed plate 1003, providing precise guidance for the up-and-down reciprocating movement of the grading component 3. To facilitate feeding, a feeding hopper 6 is fixedly connected to the top of the top plate 5. The material can smoothly enter the inside of the box 4 through the feeding hopper 6 and fall onto the uppermost large particle screen 301. To facilitate the collection of the finest bran after screening, a receiving box 8 is provided below the bottom plate 2. The material screened from the fine particle screen 303 can fall directly into the receiving box 8. To ensure that the entire device can be placed stably, a support leg 1 is fixedly connected to the bottom of the box 4.

[0031] Working principle: Start motor 701. Motor 701 drives the first driven wheel 703, the second driven wheel 704 and the third driven wheel 705 to rotate synchronously through drive wheel 702 and belt drive. This drives multiple cams 706 fixed on the first rotating shaft 707, the second rotating shaft 708 and the third rotating shaft 709 to rotate. As the cams 706 rotate, their eccentric profile surfaces periodically push upward against the bottom of the second end of the large particle screen 301, the medium particle screen 302 and the fine particle screen 303 respectively in contact with them, forcing them to swing upward around the rotating rod 304 at the first end. During this process, the spring 1002 in the buffer assembly 10 connected to the second end of the grading assembly 3 is compressed or stretched.

[0032] When the highest point of cam 706 has passed and its pushing force on the screen disappears, the elastic potential energy stored in spring 1002 is rapidly released, pulling or pushing the second end of grading component 3 to quickly return downward and re-abut against the contour surface of cam 706, completing the vibration cycle. During the entire up-and-down reciprocating motion, guide rod 9 guides movable plate 1001, ensuring the smoothness of the movement of the second end of grading component 3. Through the synergistic effect of continuous pushing of drive component 7 and rapid reset of buffer component 10, grading component 3 generates high-frequency reciprocating vibration.

[0033] The bran to be graded is added from the feeding hopper 6. The material falls onto the vibrating large particle screen 301, where large particles of bran are screened out. Small particles pass through the screen and fall onto the medium particle screen 302. On the medium particle screen 302, medium-sized particles of bran are screened out, and even smaller particles pass through the screen and fall onto the fine particle screen 303. On the fine particle screen 303, fine particles of bran are screened out, and the finest powdery bran passes through all the screens and falls into the receiving box 8 below the bottom plate 2 for collection. This achieves efficient particle size grading of bran.

Claims

1. A bran particle size grading sieve, comprising: The housing (4) includes a top plate (5) and a bottom plate (2); A grading assembly (3), the grading assembly (3) having a first end rotatably connected to the inner wall of the box (4) via a rotating rod (304), and a second end capable of swinging up and down within the box (4), characterized in that it further includes: The drive component (7) and the buffer component (10) are disposed at the second end of the hierarchical component (3); The drive assembly (7) includes a motor (701) and a cam (706) driven to rotate by the motor (701), the profile surface of the cam (706) being able to periodically abut and push against the bottom of the second end of the grading assembly (3); The buffer assembly (10) includes: a fixed plate (1003), a movable plate (1001), and a spring (1002). The fixed plate (1003) is fixedly connected to the inner wall of the housing (4), the movable plate (1001) is fixedly connected to the second end side wall of the grading assembly (3), and the spring (1002) is connected between the fixed plate (1003) and the movable plate (1001). The spring force direction of the spring (1002) is opposite to the pushing direction of the cam (706).

2. The bran particle size grading sieve according to claim 1, characterized in that: The grading component (3) includes a large particle sieve (301), a medium particle sieve (302), and a fine particle sieve (303) arranged at intervals from top to bottom; The drive assembly (7) includes a plurality of cams (706) respectively disposed below the large particle sieve (301), the medium particle sieve (302) and the fine particle sieve (303).

3. The bran particle size grading sieve according to claim 2, characterized in that: The drive assembly (7) further includes a drive wheel (702), a first driven wheel (703), a second driven wheel (704), and a third driven wheel (705), as well as a first rotating shaft (707), a second rotating shaft (708), and a third rotating shaft (709) for mounting the cam (706). The drive wheel (702) drives the first driven wheel (703) via a belt, the first driven wheel (703) drives the second driven wheel (704) via a belt, and the second driven wheel (704) drives the third driven wheel (705) via a belt. The first rotating shaft (707), the second rotating shaft (708), and the third rotating shaft (709) are coaxially fixedly connected to the third driven wheel (705), the second driven wheel (704), and the first driven wheel (703), respectively, and drive the large particle sieve (301), the medium particle sieve (302), and the fine particle sieve (303) respectively.

4. The bran particle size grading sieve according to claim 1, characterized in that: The buffer assembly (10) also includes a guide rod (9), the upper and lower ends of which are fixedly connected to the bottom of the top plate (5) and the top of the bottom plate (2), respectively, and the guide rod (9) passes through the movable plate (1001), the spring (1002) and the fixed plate (1003).

5. The bran particle size grading sieve according to claim 1, characterized in that: The top of the top plate (5) is fixedly connected to a feeding hopper (6), and the bottom of the top plate (5) is provided with a receiving box (8).

6. The bran particle size grading sieve according to claim 1, characterized in that: The top of the top plate (5) is fixedly connected to the feeding hopper (6).

7. The bran particle size grading sieve according to claim 1, characterized in that: The bottom of the box (4) is fixedly connected to a support leg (1).

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