阅读说明：本技术 一种能够自动清洁的烟叶分级操作台 (Tobacco leaf grading operation table capable of being automatically cleaned ) 是由 董世良 石刚 何结望 魏敏 刘峰峰 刘剑峰 于 2020-07-10 设计创作，主要内容包括：本发明公开了一种能够自动清洁的烟叶分级操作台。包括：传送带、刮刀、转动轮,传送带与转动轮接触一侧的下方设置有迎合部,迎合部与传送带贴合,迎合部与传送带贴合位置的前端开设有用以安装刮刀的安装座,刮刀与安装座之间通过转轴连接,刮刀的刀身外侧与安装座之间设置有伸缩装置,刮刀的刀身内侧弧度能够贴合传送带与转动轮的接触位置,当迎合部与传送带贴合时,刮刀在伸缩装置的推动下能够转动到与传送带贴合的位置,刮刀的前端设置有球形的无锋部,使得当传送带随转动轮一起转动时,无锋部能够压住传送带平整进入刮刀的刀刃部区域,清理传送带的外表面。本发明以传送带作为台面,可往复循环使用,快速更换新的台面以满足工作需求。(The invention discloses a tobacco leaf grading operation table capable of being automatically cleaned. The method comprises the following steps: the conveyer belt, the scraper, the rotation wheel, the conveyer belt is provided with the portion of catering to with the below of rotating wheel contact one side, the portion of catering to and the laminating of conveyer belt, the mount pad that is used for installing the scraper is offered with the front end of conveyer belt laminating position to the portion of catering to, be connected through the pivot between scraper and the mount pad, be provided with the telescoping device between the blade outside of scraper and the mount pad, the inboard radian of the blade of scraper can laminate the conveyer belt and rotate the contact position of wheel, when the portion of catering to laminate with the conveyer belt, the scraper can rotate the position with the conveyer belt laminating under the promotion of telescoping device, the front end of scraper is provided with spherical no front portion, make when the conveyer belt rotates along with the rotation wheel, no front portion can push down the conveyer belt and level the cutting part region who gets into the scraper, clear up the. The conveying belt is used as the table top, the conveying belt can be used in a reciprocating and circulating mode, and a new table top is replaced quickly to meet the working requirements.)

1. A tobacco leaf grading console that can self-cleaning, its characterized in that includes: the conveying belt (1), the scraper (2) and the rotating wheel (3) are used as a table board, the conveying belt (1) is sleeved on the rotating wheel (3), a meeting part (5) is arranged below one side of the conveying belt (1) and the rotating wheel (3) in contact, the meeting part (5) is attached to the conveying belt (1), a mounting seat used for mounting the scraper (2) is arranged at the front end of the meeting part (5) and the attaching position of the conveying belt (1), the root of the scraper (2) is connected with the mounting seat through a rotating shaft, a telescopic device (21) is arranged between the outer side of a scraper body of the scraper (2) and the mounting seat, the radian of the inner side of the scraper body of the scraper (2) can be attached to the contact position of the conveying belt (1) and the rotating wheel (3), and when the meeting part (5) is attached to the conveying belt (1), scraper (2) are in can rotate under the promotion of telescoping device (21) with the position of conveyer belt (1) laminating, the front end of scraper (2) is provided with spherical no front (22), makes to work as conveyer belt (1) is followed when rotating wheel (3) and rotating together, no front (22) can be pushed down conveyer belt (1) levels and gets into the cutting edge portion (23) region of scraper (2), the clearance the surface of conveyer belt (1).

2. An automatically cleanable tobacco leaf staging console according to claim 1, further comprising a storage bin (10) and a power device (7), the storage bin (10) being located below the scraper (2), the power device (7) providing rotational power to the rotating wheel (3).

3. The tobacco leaf grading operation table capable of automatically cleaning according to claim 1, characterized in that the blade part (23) of the scraper (2) is V-shaped, a plurality of groups of the scrapers (2) are arranged in front and back, and the blade part (23) and the no-sharp part (22) are arranged in a staggered manner.

4. The automatic cleaning tobacco leaf grading operation table according to claim 3, characterized in that the rotating wheel (3) is connected with the base through a fixed rod (31), and the fixed rod (31) is provided with a limit block (32) for abutting against the edge of the two sides of the rotating wheel (3) which is not covered by the conveyor belt (1).

5. The tobacco leaf grading operation table capable of being automatically cleaned according to claim 1, further comprising a cleaning roller (4), wherein a rotating shaft (41) of the cleaning roller (4) is linked with a rotating shaft core of the rotating wheel (3), the rotating directions are consistent, and two ends of the rotating shaft (41) are rotatably connected with the side wall of the base.

6. A self-cleaning tobacco staging station according to claim 1 further comprising a housing (61) for enclosing internal devices, the housing (61) being spaced above the countertop and outside the conveyor (1).

7. A self-cleaning tobacco staging console according to claim 1 further comprising a suction device (8), the suction device (8) being located on the right and powered by the power device (7), the suction opening of the suction device (8) being aligned with the conveyor (1).

8. The automatic cleaning tobacco leaf grading operation table according to claim 1, characterized in that a bearing platform (6) is arranged below the conveyor belt (1), frames (9) are arranged on the front side and the rear side of the bearing platform (6), and the frames (9) and the bearing platform (6) can be detached.

9. The tobacco grading operation table according to claim 8, characterized in that the frame (9) is provided with a limiting member (91), the limiting member (91) is located above the conveyor belt (1), and the frame (9), the limiting member (91) and the bearing platform (6) wrap the two side edges of the conveyor belt (1).

10. A self-cleaning tobacco staging station according to claim 1 wherein the outer surface of the conveyor (1) is provided with a teflon coating.

Technical Field

The invention relates to the technical field of tobacco leaf grading, in particular to a tobacco leaf grading operation table capable of being automatically cleaned.

Background

Tobacco leaf grading is the basis and key for tobacco leaf purchasing and tobacco leaf sample preparation. The tobacco leaf grading has certain requirements on the environmental light, the change of the environmental light can influence the judgment of the tobacco leaf grading result, and under the condition of certain environmental light, the included angle between the surface of the tobacco leaf and the light during grading also has certain influence on the judgment result of the tobacco leaf grading.

Currently, tobacco leaf grading is mainly carried out in farmer homes, purchasing stations and tobacco leaf grading rooms. When the tobacco leaves are classified at peasant households, the tobacco leaves are generally placed on the ground or a short table, and the tobacco leaves are horizontally placed; when the tobacco leaves are placed on the ground or a purchasing line, the tobacco leaves are also placed horizontally; when the sample is prepared in the tobacco leaf grading chamber, the tobacco leaves are generally placed on a table with a certain height and are also horizontally placed. The included angle between the vertical direction of the tobacco leaf surface and the light is basically 0 degree. Under an ideal condition, the included angle between the vertical direction of the surface of the tobacco leaf and the light ray is 0-45 degrees, the included angle between the desktop and the horizontal plane is not more than 30 degrees in consideration of actual conditions and YC/T291-2009 regulations, and accurate judgment of the grade of the tobacco leaf is facilitated. Meanwhile, under the condition that the tobacco leaves are tiled on the ground or placed on a horizontal desktop to work, people need to hook the heads to work, the time is long, people are easy to fatigue, the energy consumption is high, the judgment of the tobacco leaf grading result can be interfered to a certain extent, and the working efficiency is reduced.

On piece and the tobacco leaf grading platform can be remained to the tobacco leaf grading in-process, the staff just can continue to work after needing to clear up the mesa, and the mesa of fixed setting all needs to be laboured and wastes manpower, material resources at every turn to clear up the installation gap at mesa and edge still not necessarily.

Disclosure of Invention

The invention aims to provide a tobacco leaf grading operation table capable of being automatically cleaned, which can automatically clean residual scraps on a table top, quickly replace the table top and save manpower and material resources.

The technical scheme adopted by the invention for solving the technical problem is to provide a tobacco leaf grading operation table capable of being automatically cleaned, which comprises the following steps: the conveyer belt, the scraper, the rotating wheel are used as the mesa, the conveyer belt cover is established on the rotating wheel, the conveyer belt with the below of rotating wheel contact one side is provided with the meeting portion, the meeting portion with the conveyer belt laminating, the meeting portion with the mount pad that is used for installing the scraper is offered to the front end of conveyer belt laminating position, the scraper root with be connected through the pivot between the mount pad, the blade outside of scraper with be provided with telescoping device between the mount pad, the inboard radian of blade of scraper can laminate the contact position of conveyer belt with the rotating wheel, when the meeting portion with the conveyer belt laminating, the scraper can rotate under the promotion of telescoping device with the position of conveyer belt laminating, the front end of scraper is provided with spherical no front portion, make when the conveyer belt along with the rotating wheel rotates together, the no-sharp part can press the conveyor belt to enter the scraper smoothly, so that the outer surface of the conveyor belt is cleaned.

Further, the scraper device further comprises a storage box and a power device, wherein the storage box is located below the scraper, and the power device provides rotating power for the rotating wheel.

Further, the cutting edge portion of scraper is "V" type, sets up the multiunit around the scraper, cutting edge portion with no sharp portion crisscross the setting.

Furthermore, the rotating wheel is connected with the base through a fixed rod, and a limit block is arranged on the fixed rod and used for abutting against the edges, not covered by the conveyor belt, of the two sides of the rotating wheel.

Furthermore, still include clean gyro wheel, the axis of rotation of clean gyro wheel with the pivot linkage of rotating the wheel, the rotation direction is unanimous, the both ends of axis of rotation are connected with the lateral wall rotation of base.

Furthermore, the rotary table further comprises a shell for packaging the internal device, two ends of the rotary shaft are inserted into the shell, and a gap is reserved between the shell and the conveyor belt on the working table surface.

Furthermore, the device also comprises a dust suction device, wherein the power device is used for providing power for the dust suction device positioned on the right side, and a dust suction port of the dust suction device is aligned with the conveyor belt.

Further, a bearing platform is arranged below the conveyor belt, frames are arranged on the front side and the rear side of the bearing platform, and the frames and the bearing platform can be detached.

Further, the frame is provided with the locating part, the locating part is located the conveyer belt top, the frame the locating part, cushion cap parcel the both sides border of conveyer belt.

Furthermore, a polytetrafluoroethylene coating is arranged on the outer surface of the conveyor belt.

The invention has the beneficial effects that: 1. the table top which is fixedly used is abandoned, the conveyor belt is used as the table top, the table top can be used in a reciprocating and circulating mode, a new table top is replaced quickly to meet the working requirement, and the conveyor belt is cleaned conveniently by the cleaning device; cleaning the outer surface of the conveyor belt for multiple times by using a cleaning roller to remove larger residues, deeply cleaning fine scraps on the surface of the conveyor belt by using a scraper combination, finally performing dust collection operation on the dust, the scraps and the like which are possibly remained or fallen on the conveyor belt when the conveyor belt is used as a table top next time, removing other dust and scraps on the conveyor belt, then using the conveyor belt as the table top, and rotating the conveyor belt to a bearing table. 2. The scraper sets up no sharp portion and is used for further leveling the conveyer belt that gets into the cutting edge part region, and blade, the cutting edge of scraper are the arc setting and combine the radian unanimity that rotates the wheel position with the conveyer belt to avoid the scraper to harm the conveyer belt. 3. The outer surface of the conveyor belt can be added with a polytetrafluoroethylene coating, so that the requirement of the tobacco grading laboratory on a workbench is met, and the further smooth outer surface can be more easily separated from scraps, dust and the like.

Drawings

FIG. 1 is an overall side view of a self-cleaning tobacco staging station according to an embodiment of the present invention;

FIG. 2 is an overall top view of a tobacco staging console capable of automatic cleaning in accordance with an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view taken along line A in FIG. 2 according to an embodiment of the present invention;

FIG. 4 is a schematic view of a scraper assembly of a tobacco grading operating table capable of automatic cleaning according to an embodiment of the invention;

FIG. 5 is a side view of a scraper of a tobacco grading console capable of automatic cleaning according to an embodiment of the present invention;

FIG. 6 is an enlarged view of the structure at B in FIG. 2 according to an embodiment of the present invention;

FIG. 7 is an enlarged view of the structure at C in FIG. 1 according to an embodiment of the present invention;

FIG. 8 is an enlarged view of the structure at D in FIG. 1 according to an embodiment of the present invention;

fig. 9 is an enlarged view of the structure at E in fig. 8 according to an embodiment of the present invention.

In the figure: 1. a conveyor belt; 2. a scraper; 3. a rotating wheel; 4. cleaning the roller; 5. a catering section; 6. a bearing platform; 7. a power plant; 8. a dust collection device; 9. a frame; 10. a storage box; 21. a telescoping device; 22. no sharp edge part; 23. a knife edge part; 31. fixing the rod; 32. a limiting block; 41. a rotating shaft; 61. a housing; 91. and a limiting member.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention and the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is to be understood that the drawings in the following description are merely exemplary of the invention and that other drawings and embodiments can be derived by those skilled in the art without undue burden. The designation of the design orientation merely indicates the relative positional relationship between the respective members, not the absolute positional relationship.

According to the relevant specification for the table in YC/T291-2009, the height of the table: the distance between the wrist and the ground is 800 mm-1050 mm, which is the height between the wrist and the ground when a worker stands and the arm naturally droops under the common condition. If the seat is equipped, the relative height between the height of the seat and the working table top is 250 mm-350 mm. The color of the table should be N7.3 and the table top should have diffuse reflectance properties. If the table is tilted, the tilt angle should not be greater than 30 °. In the embodiment of the invention, the height of the workbench is implemented according to the specification, whether the workbench is provided with a seat or not can be equipped according to the actual situation, the color of the workbench needs to carry out corresponding treatment on the conveyor belt 1 serving as the table top so as to meet the requirement, and the diffuse reflection characteristic of the table top can be determined by the manufacturing material of the conveyor belt or a polytetrafluoroethylene coating is added. The size of the rotating wheel 3 positioned on one side of the scraper can meet the requirement of installing the plurality of groups of scrapers 2, and in the implementation process, the rotating wheel 3 with the proper size can be selected by actual conditions to drive the conveying belt 1. The conveyor belt 1 can be tightly hooped on the rotating wheels 3 at two sides so as to ensure that the conveyor belt 1 can smoothly advance and circularly reciprocate. When the single-wheel drive cannot satisfy the forward power of the conveyor belt 1, the two-wheel drive may be implemented.

In the embodiment of the present invention, the shading in fig. 6 and 7 is only to distinguish the structural characteristics and the positional relationship.

Referring to fig. 1 and fig. 2, the embodiment of the present invention may be divided into three regions, which are a cleaning region, a working region, and a power region from left to right. Wherein the cleaning area is responsible for cleaning and collecting the debris; the working area is used for screening and grading the workers; the power region provides the associated power.

The invention relates to a tobacco leaf grading operation table capable of automatically cleaning, which comprises: the utility model relates to a table board, which comprises a conveying belt 1 used as a table board, a scraper 2 and a rotating wheel 3, wherein the conveying belt 1 is sleeved on the rotating wheel 3, a meeting part 5 is arranged below one side of the contact of the conveying belt 1 and the rotating wheel 3, the meeting part 5 is attached to the conveying belt 1, a mounting seat for mounting the scraper 2 is arranged at the front end of the attaching position of the meeting part 5 and the conveying belt 1, the root of the scraper 2 is connected to the mounting seat through a rotating shaft, a telescopic device 21 is arranged between the outer side of a scraper body of the scraper 2 and the mounting seat, the inner side radian of the scraper body of the scraper 2 can be attached to the contact position of the conveying belt 1 and the rotating wheel 3, when the meeting part 5 is attached to the conveying belt 1, the scraper 2 can be driven by the telescopic device 21 to rotate to the attaching position of the conveying belt 1, the front end of the scraper 2 is provided with a spherical no front part, when the conveyor belt 1 rotates along with the rotating wheel 3, the no-sharp part 22 can press the conveyor belt 1 to flatly enter the area of the knife edge part 23 of the scraper 2, and the outer surface of the conveyor belt 1 is cleaned.

Please refer to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, and fig. 9. The conveyor belt 1 is used as a working table for tobacco leaf grading and screening. The conveyor belt 1 is sleeved on the rotating wheel 3 and can rotate along with the rotating wheel 3 to move. When the length of the conveyor belt 1 is sufficient, the conveyor belt 1 can be divided into a plurality of work surface segments, only one segment being used at a time, and the turning wheel 3 turns one segment length at a time, replacing one segment length of the conveyor belt 1. Position that conveyer belt 1 and rotation wheel 3 combine, conveyer belt 1 hug closely in one side of rotating wheel 3, can set up a meeting portion 5 in the below at combination position, and meeting portion 5 can with hug closely the laminating of conveyer belt 1 that rotates wheel 3, and the mount pad has been seted up with the front end at the 1 laminating position of conveyer belt to meeting portion 5, the mount pad is used for installing scraper 2, and the blade of scraper 2 can set up to the arc, be connected through the pivot between the root of scraper 2 and the mount pad, and the position of pivot is confirmed by the rotation range at 2 roots of scraper, makes it can hug closely conveyer belt 1 that rotates wheel 3 with meeting portion 5 synchronous laminating. The front end of the scraper 2 is provided with a no-sharp part 22 and a knife edge part 23. The blade middle part of mount pad and scraper 2 still is provided with telescoping device 21 for when adjusting telescoping device 21, scraper 2 can revolute the rotation of axes, and when scraper 2 rotated to and the laminating of conveyer belt 1, conveyer belt 1 ran along with rotating wheel 3, and no frontal portion 22 can be pushed down conveyer belt 1 makes it flat entering scraper 2's cutting edge portion 23 region.

No front 22 can be designed to be spherical, and cutting edge portion 23 sets up with spherical tangent for conveyer belt 1 can laminate with cutting edge portion 23 when getting into cutting edge portion 23, thereby makes scraper 2 can clear up the remaining piece on the conveyer belt 1 in the cutting edge portion 23 region. It will be appreciated that the blades 2 may be arranged in groups one behind the other to ensure cleaning in the event that the spatial position is satisfactory.

The telescopic device 21 can be adjusted for multiple times in the using process of the invention to achieve better cleaning effect. The telescopic device 21 can be adjusted manually or automatically by means of software system control. During manual adjustment, the telescopic length of the telescopic device 21 can be adjusted by utilizing a thread matching structure, and the telescopic device 21 can reside in a fixed position, so that the scraper 2 is always in a state of being attached to the conveyor belt 1, and whether the power device 7 is started or not to control the rotating wheel 3 to rotate is irrelevant to the position state of the scraper 2. When the control is carried out by adopting a software system, the extension and contraction of the extension and contraction device 21 can be controlled by adopting a driving device, the extension and contraction length is determined by debugging, and the extension and contraction device 21 can push the scraper 2 to be attached to the conveyor belt 1 when a cleaning working button is started to start cleaning the outer surface of the conveyor belt 1; when the cleaning operation button is turned off, the retractor 21 pulls the scraper 2 back, away from the conveyor belt 1.

As a preferred embodiment, the scraper device further comprises a storage box 10 and a power device 7, wherein the storage box 10 is positioned below the scraper 2, and the power device 7 provides rotating power for the rotating wheel 3. Referring to fig. 1, 2, 7, 8, and 9, a storage box 10 is required to be disposed for temporarily storing the cleaning debris, the storage box 10 may be disposed below the scraper 2, and the cleaning portion of the scraper 2 may extend out of the mounting seat of the meeting portion 5, so that the debris can fall freely under the action of gravity when the scraper 2 scrapes the debris. A certain chip falling space can be reserved between the scraper 2 and the storage box 10, so that the chips can fall freely. The power device 7 provides power for the rotating wheel 3, so that the rotating wheel 3 can drive the conveyor belt 1 to move on the table board, and the conveyor belt 1 is ensured to be used as the table board in a circulating mode.

As a preferred embodiment, the blade portions 23 of the scrapers 2 are V-shaped, multiple groups of the scrapers 2 are arranged in front and at the back, and the blade portions 23 and the non-blade portions 22 are arranged in a staggered manner. Referring to fig. 4, 5, 8 and 9, the blade portion 23 of the scraper 2 may be designed as a "V" shape, and the inner side thereof is provided with a blade. Multiunit scraper 2 clears up conveying belt 1 around can setting up, and no front 22 of scraper 2 can crisscross setting with cutting edge portion 23, and no front 22 of a set of scraper 2 corresponds the cutting edge portion 23 of a set of scraper 2 in back promptly for the surface of conveyer belt 1 all can be cleared up by cutting edge portion 23, avoids omitting, and multiunit scraper 2 clears up in coordination in order to ensure the clearance effect.

As a preferred embodiment, the rotating wheel 3 is connected with the base through a fixing rod 31, and the fixing rod 31 is provided with a stopper 32 for abutting against the edge of the two sides of the rotating wheel 3 which is not covered by the conveyor belt 1. Referring to fig. 1, 2 and 6, when the rotating wheel 3 is installed, a bearing base is needed to determine the fixed position of the rotating wheel 3, and the base is the necessary frame structure needed for installation. The base and the rotating wheel 3 can be connected through a fixing rod 31, the fixing rod 31 and the shaft core of the rotating wheel 3 are connected in a rotating mode, and the rotating wheel 3 can rotate around the shaft core under the driving of the power device 7. A stopper 32 may be disposed on the fixing rod 31, and one end of the stopper 32 abuts against a position where both ends of the rotating wheel 3 are not covered by the conveyor belt 1. The limiting block 32 can limit the covering position of the conveyor belt 1 on the rotating wheel 3 on one hand, and can also determine whether the mounting position of the rotating wheel 3 is qualified on the other hand, and when the limiting block 32 is abutted against the rotating wheel 3, the base and the rotating wheel 3 are mounted in a combined mode.

As a preferred embodiment, the cleaning device further comprises a cleaning roller 4, a rotating shaft 41 of the cleaning roller 4 is linked with a rotating shaft core of the rotating wheel 3, the rotating directions are consistent, and two ends of the rotating shaft 41 are rotatably connected with the side wall of the base. Referring to fig. 1, 2, 6 and 7, before the scraper 2 is cleaned, a cleaning roller 4 may be further provided, the rotation directions of the cleaning roller 4 and the rotating wheel 3 are both counterclockwise rotation, the rotation shaft 41 of the cleaning roller 4 may be linked with the rotation axis of the rotating wheel 3, and the rotation shaft 41 may be linked with the rotation axis of the rotating wheel 3 through a belt. Both ends of the rotating shaft 41 may be engaged with the sidewalls of the base to be rotatably connected, so that the cleaning roller 4 is fixed in position. Because the cleaning roller 4 and the conveyor belt 1 both rotate anticlockwise, the brush of the cleaning roller 4 at the contact position of the cleaning roller 4 and the conveyor belt 1 can brush the outer surface of the conveyor belt 1 reversely, so that larger and faster chips attached to the surface of the conveyor belt 1 can be brushed off, and fall into the lower storage box 10 for collecting the chips from the other side along with the rotation of the cleaning roller 4. It is understood that the coupling diameter of the rotating shaft 41 of the cleaning roller 4 should be smaller than that of the rotating core of the rotating wheel 3 so that the rotating speed of the cleaning roller 4 is higher than that of the rotating wheel 3 to rapidly clean the outer surface of the conveyor belt 1.

As a preferred embodiment, the device further comprises a housing 61 for enclosing the internal devices, wherein the housing 61 is spaced from the outer surface of the conveyor belt 1 on the working table. Referring to fig. 1, the base and the side wall of the embodiment of the invention are used for installing related components, an additional shell 61 is required for protecting the whole structure, and the shell 61 can be wrapped by other structures except the table top. The shell 61 is located on the conveyor belt 1, a gap is reserved between the outer surface of the conveyor belt 1, the gap can prevent complete tobacco leaves from entering a cleaning area along with the conveyor belt 1, and the conveyor belt 1 entering the cleaning area is cleaned in the first step. It can be understood that the gap is not limited to blocking the finished tobacco leaves from entering the cleaning area, and when the cleaning area operates, the gap can block other articles left on the table top or entering accidentally, so that the damage to the structure in the cleaning area or the influence on the cleaning effect can be avoided.

In a preferred embodiment, the device further comprises a dust suction device 8, the power device 7 is used for providing power for the dust suction device 8 at the right side, and a dust suction opening of the dust suction device 8 is aligned with the conveyor belt 1. Referring to fig. 1, the length of the conveyor belt 1 can be adapted to a plurality of segments as a table, and when one segment of the conveyor belt 1 needs to be cleaned, the rotating wheel 3 rotates to rotate the other segment of the conveyor belt 1 to the table position. The section following cleaning can be put into a waiting next-time use mode, before the next use the conveyor belt 1 of this section is in a state of silence, replacing the section of the conveyor belt 1 currently in use when the turning wheel 3 is turned again. When each section enters the use table surface, the section on the conveyor belt 1 can be subjected to dust collection by using the dust collection device 8, and the power of the dust collection device 8 can be provided by the power device 7 of the rotating wheel 3, so that each time the rotating wheel 3 is operated, the dust collection device 8 performs dust collection on the section of the conveyor belt 1 which is about to operate to the table surface. The rotating wheel 3 only needs to rotate for a fixed number of turns each time to meet the requirement of alternately using a plurality of table top sections on the conveyor belt 1.

In a preferred embodiment, a bearing platform 6 is arranged below the conveyor belt 1, frames 9 are arranged on the front side and the rear side of the bearing platform 6, and the frames 9 and the bearing platform 6 can be detached. Referring to fig. 1, 2 and 3, when the conveyor belt 1 is used as a table top, because the conveyor belt 1 is a soft belt and has elasticity, a certain degree of deformation can occur, which does not meet the relevant regulations of the tobacco leaf grading screening, and a bearing platform 6 is needed to be designed to ensure that the conveyor belt 1 becomes a flat table top. The platform 6 is placed below the conveyor belt 1 so that when the conveyor belt 1 is positioned above the platform 6, the conveyor belt 1 can act as a work surface, meeting the regulations. The front side and the rear side of the bearing platform 6 can be provided with frames 9, the frames 9 can be used for protecting the edge parts of the conveyor belt 1, and meanwhile, the moving range of the conveyor belt 1 can be limited and cannot be deviated. It can be understood that the bearing platform 6 and the frame 9 can be detached independently, so that the related devices can be cleaned and maintained conveniently and timely.

As a preferred embodiment, the frame 9 is provided with a limiting member 91, the limiting member 91 is located above the conveyor belt 1, and the frame 9, the limiting member 91, and the bearing platform 6 wrap the edges of the two sides of the conveyor belt 1. Referring to fig. 3, the frame 9 may be slightly higher than the table top position where the conveyor belt 1 is located, and then a limiting member 91 extends toward the center of the table top, and the limiting member 91 covers the edge position of the conveyor belt 1, so that the bearing platform 6, the frame 9, and the limiting member 91 can wrap the edge of the conveyor belt 1 located above the bearing platform 6, and play a role in pressing the edge portion of the conveyor belt 1, thereby further leveling the conveyor belt 1 located above the bearing platform 6.

As a preferred embodiment, the outer surface of the conveyor belt 1 is provided with a teflon coating. The polytetrafluoroethylene has excellent chemical properties, corrosion resistance, high lubrication non-adhesiveness, electric insulation and good ageing resistance. The outer surface of the conveyor belt 1 can be provided with a polytetrafluoroethylene coating to increase the smoothness of the outer surface, alkaline substances contained in tobacco leaves cannot generate chemical damage to the polytetrafluoroethylene, and tobacco leaf scraps are easier to clean when being positioned on the surface of the coating.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the specific embodiments of the invention be limited to these descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.