A screening device for tobacco leaf

Abstract

The utility model relates to a kind of screening devices for tobacco leaf threshing redrying, the device includes two symmetrical channel steel pedestals, base top is equipped with screening box, two layers of inclined screen mesh are arranged longitudinally in box, the aperture of upper screen mesh and lower screen mesh decreases in turn from top to bottom, two groups of poking mechanism are rotatably installed in box, each group of mechanism includes upper roll shaft and lower roll shaft, roll shaft outside is equipped with the annular matrix arrangement of poking plate, trapezoidal flexible dispersion tooth of horizontally arranged is installed outside poking plate, power box is equipped outside screening box, internal transmission mechanism is driven by speed reducer motor, power is transmitted by the meshing of speed reduction shaft, driving gear and linkage gear, and the synchronous rotation between each roll shaft is realized by synchronous belt, vibration motor is also installed on the both sides of screening box;The device is combined by vibration and mechanical poking, utilizes flexible dispersion tooth to realize soft handling to material, effectively improves screening efficiency and quality, while reducing material breakage and jamming risk.

Description

Technical Field

[0001] This utility model relates to the technical field of tobacco processing equipment, and in particular to a screening device for tobacco leaf threshing and re-drying. Background Technology

[0002] In the tobacco processing industry, after the tobacco leaves are threshed and re-dried, they need to be graded according to their size specifications. Traditional screening equipment mostly uses vibrating screens to separate materials.

[0003] In actual production, tobacco leaves have a certain degree of stickiness and moisture, which makes them prone to sticking and accumulating on the screen surface, leading to a decrease in screening efficiency. Existing technologies often cause physical damage to the tobacco leaves by increasing the vibration frequency or using rigid levers to assist in material distribution, affecting product quality. Some equipment attempts to use multi-layer screen structures, but there are still shortcomings in material flow control. Tobacco leaves of different sizes cannot be fully dispersed, affecting grading accuracy. In addition, the transmission system often uses an independent drive mode, which not only increases energy consumption but also makes the equipment structure complex and the maintenance cost high.

[0004] These factors all constrain the overall efficiency of the screening process, necessitating a solution that balances screening efficiency, material integrity, and operational stability. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies where tobacco leaves of different sizes cannot be fully dispersed, thus affecting grading accuracy. This invention proposes a sieving device for tobacco leaf threshing and re-drying.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A screening device for tobacco leaf threshing and re-drying includes two symmetrically arranged channel steel bases. The top of the two channel steel bases is provided with the same screening box for screening tobacco leaves. The screening box is equipped with an upper screen and a lower screen arranged in a longitudinal direction with successively decreasing apertures and arranged at an inclination. The screening box is rotatably equipped with two sets of actuating mechanisms for dispersing and agitating the tobacco leaves rolling off the upper and lower screens. A power box is fixed on the outside of the screening box. A transmission mechanism, located inside the power box, is used to synchronize the rotation of the actuating mechanism.

[0007] Furthermore, each set of actuating mechanisms includes an upper roller shaft and a lower roller shaft. Multiple actuating plates arranged in a ring matrix are fixed on the outer side of the upper roller shaft and the lower roller shaft. Flexible dispersing teeth arranged in a trapezoidal pattern and arranged horizontally are fixed on the outer side of the actuating plates for dispersing tobacco leaves. The dispersing teeth on the outer side of the lower roller shaft are closer to the screen.

[0008] Furthermore, the transmission mechanism includes a geared motor fixed to the outside of the power box, the end of the output shaft of the geared motor extends into the inside of the power box and is coaxially fixed with a geared shaft rotatably mounted on the side wall of the power box via bearings, and the geared shaft is connected to the outside of the upper roller shaft located below.

[0009] Furthermore, a drive gear is fixedly sleeved on the outer side of the reduction shaft, and a linkage gear that meshes with the drive gear is fixedly sleeved on the outer side of the upper roller shaft located below.

[0010] Furthermore, the upper roller shaft located above and the upper roller shaft located below are connected to the upper roller shaft via a synchronous pulley drive and are connected to each other ...

[0011] Furthermore, vibratory motors for providing vibration force for the screening operation are fixed on both opposite sides of the screening box.

[0012] In this utility model, the sieving device for tobacco leaf threshing and re-drying adopts an inclined screen with a longitudinal arrangement and decreasing aperture, which, together with the vibration force generated by the vibrating motor, makes the tobacco leaves move forward in a continuous jumping motion on the screen surface, effectively reducing the clogging of materials at the screen holes, and at the same time allowing tobacco leaves of different sizes to be more fully exposed on the sieving surface, thus improving the grading accuracy. In this invention, the sieving device for tobacco leaf threshing and re-drying features dispersing teeth made of flexible material. This effectively breaks up clumps of tobacco leaves while avoiding breakage caused by rigid impacts. The trapezoidal structure allows the dispersing teeth to apply a progressive force from light to heavy when contacting the material, further protecting the integrity of the tobacco leaves. The lower roller has a smaller gap between the dispersing teeth and the screen, specifically optimized for the bottom layer of material, ensuring that even small tobacco flakes pressed to the bottom by the upper layer are adequately processed. In this invention, the combination of vibration and mechanical agitation allows the device to adapt to different material states. When processing tobacco leaves with high moisture content and a tendency to clump, the enhanced mechanical agitation can compensate for the shortcomings of simple vibration. Conversely, when processing drier, more fragile tobacco leaves, the agitation intensity can be appropriately reduced, relying on vibration to complete the main screening operation. This adaptability ensures that the equipment maintains good working condition under various operating conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of a sieving device for tobacco leaf threshing and re-drying proposed in this utility model; Figure 2 This utility model proposes a screening device for tobacco leaf threshing and re-drying. Figure 1 Schematic diagram of the internal structure of the power box; Figure 3 This is a schematic diagram of the upper roller shaft and the deflector plate in the separated state of a screening device for tobacco leaf threshing and re-drying proposed in this utility model; Figure 4 This utility model proposes a screening device for tobacco leaf threshing and re-drying. Figure 2 Enlarged schematic diagram of part A in the middle.

[0014] In the diagram: 1. Channel steel base; 2. Screening box; 3. Vibrating motor; 4. Upper screen; 5. Lower screen; 6. Upper roller shaft; 7. Lower roller shaft; 8. Pulley; 9. Dispersing teeth; 10. Power box; 11. Gear motor; 12. Gear reduction shaft; 13. Drive gear; 14. Linkage gear; 15. Synchronous belt. 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 of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] In one embodiment Reference Figure 1-4 A screening device for tobacco leaf threshing and re-drying. The entire device is supported on the ground by two symmetrically arranged channel steel bases 1, providing a stable working foundation for the equipment. The screening box 2 is fixed on the top of the two channel steel bases 1, forming the main space for screening operations.

[0017] Inside the screening box 2, two layers of inclined screens are fixedly installed, namely the upper screen 4 and the lower screen 5. Their mesh size decreases from top to bottom and they are arranged longitudinally. This arrangement allows the tobacco leaves to be graded according to size when they roll down the inclined surface under the action of gravity. In order to assist the material flow and prevent blockage, vibrating motors 3 are installed on both sides of the screening box 2. These vibrating motors 3 generate the necessary vibration force when they work, so that the tobacco leaves can move smoothly on the screen surface.

[0018] The core of the screening operation is the two sets of actuating mechanisms inside the box. Each set consists of an upper roller shaft 6 and a lower roller shaft 7 located below it. These roller shafts are installed horizontally inside the screening box 2 and can rotate freely. On the outer surface of each roller shaft, multiple actuating plates 8 are fixedly installed in a ring matrix. On the outer side of each actuating plate 8, a row of horizontal flexible dispersing teeth 9 is installed. These dispersing teeth are trapezoidal in shape. The gap between the end of the dispersing teeth 9 on the lower roller shaft 7 and the screen surface is set smaller than that on the upper roller shaft, so as to more effectively process material layers of different thicknesses.

[0019] The power that drives all these rollers to rotate synchronously comes from the power box 10 fixed on the outside of the screening box 2. A geared motor 11 is installed on the outer wall of the power box 10. When the equipment is started, the output shaft of the geared motor 11 starts to rotate. This shaft also extends into the power box 10 as a reduction shaft 12 and is supported on the side wall of the box by bearings.

[0020] A drive gear 13 is fixedly installed on the reduction shaft 12. One end of the upper roller shaft 6, which is horizontally corresponding to it and located in the lower layer of the screening box, also extends into the power box 10. A linkage gear 14 is fixedly installed at the end of the shaft. The drive gear 13 and the linkage gear 14 mesh directly, thereby transmitting the power of the main motor to the upper roller shaft 6.

[0021] To achieve linkage of all rollers, a synchronous belt 15 is used for transmission at the other end of the rollers. Specifically, the ends of the three rollers, namely the lower roller 7 located on the upper layer of the screening box, the upper roller 6 located on the lower layer, and the upper roller 6 located on the upper layer, are all equipped with synchronous pulleys and connected by the same synchronous belt 15. In this way, when the lower roller 6 rotates, it can drive the upper roller 6 and the lower roller 7 to rotate in the same direction. In addition, the two lower rollers 7 on the upper and lower layers are also connected and transmitted through another independent synchronous belt 15.

[0022] When the equipment is running, the geared motor 11 drives two sets of four rollers to rotate synchronously at the same speed and direction through a gear and synchronous belt system. The flexible dispersing teeth 9 installed on the rollers rotate accordingly, continuously agitating and combing the tobacco leaves that roll down from the upper screen. The combination of vibration and mechanical agitation makes the tobacco leaves fully tumble and disperse on the screen, allowing tobacco leaves of qualified size to pass through the mesh more efficiently, ultimately achieving a continuous and stable multi-stage screening effect. The use of flexible dispersing teeth 9 effectively reduces damage to the material, and its trapezoidal structure helps to better disperse the tobacco leaves during agitation and prevent clogging.

[0023] However, as is well known to those skilled in the art, the working principles and wiring methods of the vibration motor 3, the geared motor 11 and the synchronous belt 15 are all conventional means or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sieving device for tobacco leaf threshing and re-drying, used to sieve tobacco leaves during the threshing and re-drying process, characterized in that, The device includes two symmetrically arranged channel steel bases (1), and the top of the two channel steel bases (1) is provided with the same screening box (2) for screening tobacco leaves. The screening box (2) is fixedly provided with an upper screen (4) and a lower screen (5) arranged in a longitudinal direction with successively decreasing apertures. The screening box (2) is rotatably equipped with two sets of actuating mechanisms for dispersing and actuating the tobacco leaves rolling on the upper screen (4) and the lower screen (5). The screening box (2) is fixedly provided with a power box (10) on the outside. A transmission mechanism located inside the power box (10) and used to make the actuating mechanism rotate synchronously; Each set of actuating mechanisms includes an upper roller shaft (6) and a lower roller shaft (7). Multiple actuating plates (8) arranged in a ring matrix are fixed on the outer side of the upper roller shaft (6) and the lower roller shaft (7). Flexible dispersing teeth (9) arranged in a trapezoidal pattern and arranged horizontally are fixed on the outer side of the actuating plates (8) for dispersing tobacco leaves. The spacing between the dispersing teeth (9) on the outer side of the lower roller shaft (7) and the screen is smaller.

2. The sieving device for tobacco leaf threshing and re-drying according to claim 1, characterized in that, The transmission mechanism includes a geared motor (11) fixed to the outside of the power box (10). The end of the output shaft of the geared motor (11) extends into the inside of the power box (10) and is coaxially fixed with a geared shaft (12) rotatably mounted on the side wall of the power box (10) via a bearing. The geared shaft (12) is connected to the outside of the upper roller shaft (6) located below.

3. A sieving device for tobacco leaf threshing and re-drying according to claim 2, characterized in that, A drive gear (13) is fixedly sleeved on the outer side of the reduction shaft (12), and a linkage gear (14) that meshes with the drive gear (13) is fixedly sleeved on the outer side of the upper roller shaft (6) located below.

4. A sieving device for tobacco leaf threshing and re-drying according to claim 3, characterized in that, The upper roller shaft (7) located above and the upper roller shaft (6) located below are connected to the same synchronous belt (15) via synchronous pulley transmission. The two lower roller shafts (7) are connected to each other via synchronous pulley transmission via the same synchronous belt (15).

5. A sieving device for tobacco leaf threshing and re-drying according to claim 1, characterized in that, The screening box (2) is equipped with vibrating motors (3) on both sides opposite to each other to provide vibration force for screening operations.

Images