A multi-stage screening device in tobacco purity detection

Abstract

The utility model provides a multistage screening device in tobacco shred purity detection belongs to tobacco shred screening technical field. The multistage screening device in tobacco shred purity detection includes primary material conveying spare, primary screening spare, secondary material conveying spare, secondary screening spare, tertiary material conveying spare. The utility model primary screening spare screens out the first impurity of the material length exceeding first preset size, thereby realizes to the material and carries out first screening to obtain first screening material, and secondary material conveying spare vibrates and convey first screening material to secondary screening spare, and secondary screening spare screens out the second impurity of first screening material length exceeding second preset size, thereby realizes to first screening material and carries out second screening to obtain second screening material, and tertiary material conveying spare conveys second screening material to tobacco shred detection, in the work of tobacco shred purity detection, greatly saves the manpower cost, and reduces the time required between each procedure.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tobacco shred screening technical field, specifically to a multistage screening device in tobacco shred purity detection. BACKGROUND

[0002] In the tobacco industry's cigarette production and processing process, tobacco inspection is a very important link. Among them, the tobacco content, the impurity content, the most can clearly reflect the tobacco in the processing process the purity effect of cigarette. In addition, the component characteristics of the tobacco shred are also important factors to determine the sensory effect of the tobacco shred. Therefore, the tobacco purity detection needs to be carried out. When the tobacco purity detection is carried out, the tobacco needs to be screened, and the purity of different tobacco is detected after screening. However, the traditional tobacco detection is generally carried out manually, and the manual screening of tobacco has low operation efficiency. UTILITY MODEL CONTENT

[0003] The utility model discloses a multistage screening device in tobacco shred purity detection.

[0004] The utility model discloses a multistage screening device in tobacco shred purity detection, including first material conveying piece, first screening piece, second material conveying piece, second screening piece, third material conveying piece, the first material conveying piece is used to convey material to first screening piece, the first screening piece is used to carry out first screening to material to screen out the first impurity of the material length exceeding first preset size and obtains first screening material, the second material conveying piece is used to vibrate the first screening material conveying to second screening piece, the second screening piece is used to carry out again screening to the first screening material to screen out the second impurity of the first screening material length exceeding second preset size and obtains second screening material, the first preset size is greater than second preset size, the third material conveying piece is used to convey second screening material to tobacco detection.

[0005] Further, it further includes the protective frame, the protective frame includes the first support bottom plate, the shell is connected to the first support bottom plate, the first material conveying piece, first screening piece, second material conveying piece, second screening piece, third material conveying piece are arranged respectively in the inboard of shell and are connected to the first support bottom plate respectively.

[0006] Further, the first material conveying piece includes the first rack, first conveyor, material feed bin, material guide bin, the bottom of the first rack is connected to the first support bottom plate, the first conveyor is connected to the upper portion of the first rack, the material feed bin is used to convey material to the first conveyor, and the first conveyor is used to drive the material to move upward to convey the material to the material guide bin.

[0007] Further, the first conveying machine comprises a first conveying belt, two first side plates arranged in parallel on both sides of the first conveying belt, the first conveying belt is used to receive the materials falling from the material feeding bin and convey the materials upwardly into the material guide bin, the first material conveying member further comprises an electric roller rotatably connected to the two first side plates at two ends respectively, and a first brush arranged on the electric roller and located above the first conveying belt, the electric roller is used to drive the first brush to rotate, so that the first brush is used to flatten the materials located on the first conveying belt.

[0008] Further, the protective frame further comprises a first mounting frame connected to the first supporting bottom plate, the first screening member comprises a second rack, a first material screening bin and a first driving structure, the bottom of the second rack is connected to the first mounting frame, the first driving structure is connected to the upper part of the second rack, the first material screening bin is used to receive the materials falling from the material guide bin, the bottom of the first material screening bin is provided with a plurality of strip-shaped first screening slots, and the side of the first material screening bin is connected to the first driving structure; the first driving structure is used to drive the first material screening bin to move left and right along the horizontal direction, so that the first material screening bin is used to perform primary screening on the materials to form first screened materials.

[0009] Further, the second material conveying member comprises a first supporting structure, a linear vibrating machine and a material disc, the bottom of the first supporting structure is connected to the first mounting frame, the bottom of the linear vibrating machine is connected to the upper part of the first supporting structure, the material disc is used to receive the first screened materials falling from the bottom of the first material screening bin, one side of the material disc is provided with a first discharge port for the materials to slide out, and the bottom of the material disc is connected to the linear vibrating machine; the linear vibrating machine is used to drive the material disc to vibrate, so that the material disc vibrates and conveys the first screened materials to the first discharge port.

[0010] Further, the first supporting structure comprises a buffer plate, an air-filled shock absorber and a first bearing plate, the bottom of the buffer plate is connected to the first mounting frame, the top of the first bearing plate is connected to the linear vibrating machine, and the top of the air-filled shock absorber is connected to the first bearing plate and the bottom of the air-filled shock absorber is connected to the buffer plate.

[0011] Further, the secondary screening member comprises a third frame, a second driving structure, and a second material screening bin, the bottom of the third frame is connected to the first supporting bottom plate, the bottom of the second material screening bin is provided with a mesh screening part, the second material screening bin is used to receive the first screened material sliding from the first discharging port of the material disc, the second driving structure is connected to the third frame, and the side of the second material screening bin is connected to the second driving structure; the second driving structure is used to drive the second material screening bin to move up and down along the vertical direction, so that the second material screening bin re-screens the first screened material to form second screened material; and the third material conveying member is used to receive the second screened material falling from the second material screening bin and convey the second screened material to the tobacco thread detection position.

[0012] Further, the third frame is symmetrically arranged in two, the secondary screening member further comprises a guide rail buffer structure with springs, one side of the second driving structure and one side of the guide rail buffer structure are respectively connected to the two third frames, and two sides of the second material screening bin are respectively connected to the other side of the second driving structure and the other side of the guide rail buffer structure; the guide rail buffer structure is used to buffer the second material screening bin when the second material screening bin moves up and down.

[0013] Further, the secondary screening member further comprises a material protection structure connected to the third frame and used to protect the first screened material when the first screened material slides from the material disc, the material protection structure comprises a first stop plate arranged at the front side of the first discharging port of the material disc, a second stop plate arranged above the material disc, and two third stop plates respectively arranged at the left and right sides of the material disc, two side ends of the two third stop plates are respectively connected to the first stop plate, and the top of the first stop plate and the top of the two third stop plates are respectively connected to the second stop plate.

[0014] The multi-stage screening device in the tobacco thread purity detection has the following beneficial effects:

[0015] The primary material conveying member conveys the material to the primary screening member, the primary screening member screens out the first impurities with a length exceeding the first preset size from the material, so as to realize the initial screening of the material to obtain the first screened material, the secondary material conveying member vibrates and conveys the first screened material to the secondary screening member, the secondary screening member screens out the second impurities with a length exceeding the second preset size from the first screened material, so as to realize the re-screening of the first screened material to obtain the second screened material, and the third material conveying member conveys the second screened material to the tobacco thread detection position, which greatly saves the labor cost and reduces the time required for the connection between the processes in the tobacco thread purity detection. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In these drawings, like reference numerals are used to represent similar elements. The drawings in the following description are some embodiments of the present application, rather than all embodiments. For those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0017] Figure 1 It is a first inclined schematic view when the shell is omitted in the multi-stage screening device in the tobacco purity detection of the embodiment of the present application;

[0018] Figure 2 It is a second inclined schematic view when the shell is omitted in the multi-stage screening device in the tobacco purity detection of the embodiment of the present application;

[0019] Figure 3 It is a structural schematic view when the first-stage material conveying part, the first-stage screening part and the material disc are connected in the multi-stage screening device in the tobacco purity detection of the embodiment of the present application;

[0020] Figure 4 It is a structural schematic view when the first-stage screening part, the second-stage material conveying part, the second-stage screening part and the third-stage material conveying part are connected in the multi-stage screening device in the tobacco purity detection of the embodiment of the present application;

[0021] Figure 5 It is a structural schematic view in the multi-stage screening device in the tobacco purity detection of the embodiment of the present application;

[0022] Figure 6 It is a side view of the overall device when one side of the shell is omitted in the multi-stage screening device in the tobacco purity detection of the embodiment of the present application;

[0023] Figure 7 It is a structural schematic view of the first-stage material conveying part in the multi-stage screening device in the tobacco purity detection of the embodiment of the present application;

[0024] Figure 8 It is a structural schematic view of the first-stage screening part in the multi-stage screening device in the tobacco purity detection of the embodiment of the present application;

[0025] Figure 9 It is a structural schematic view of the second-stage material conveying part in the multi-stage screening device in the tobacco purity detection of the embodiment of the present application;

[0026] Figure 10 It is a structural schematic view of the second-stage screening part in the multi-stage screening device in the tobacco purity detection of the embodiment of the present application;

[0027] Figure 11 A structure schematic view of a three-level material conveying part in a multi-stage screening device in the tobacco shred purity detection of the utility model embodiment;

[0028] Figure 12 A structure schematic view of a first mounting frame in a multi-stage screening device in the tobacco shred purity detection of the utility model embodiment;

[0029] Figure 13 A structure schematic view of a material visual detection structure in a multi-stage screening device in the tobacco shred purity detection of the utility model embodiment;

[0030] Figure 14 A structure schematic view of a weighing structure in a multi-stage screening device in the tobacco shred purity detection of the utility model embodiment.

[0031] In the drawing: 1 - first material conveying part, 11 - first rack, 12 - material feeding bin, 13 - first conveyor, 14 - material guide bin, 15 - electric roller, 2 - first screening part, 21 - second rack, 22 - first driving structure, 23 - first material screening bin, 3 - second material conveying part, 31 - material disc, 32 - linear vibration machine, 33 - buffer plate, 34 - air-filled shock absorber, 35 - first bearing plate, 4 - second screening part, 41 - second material screening bin, 42 - second driving structure, 43 - third rack, 44 - guide rail buffer structure, 451 - first stop plate, 452 - second stop plate, 453 - third stop plate, 5 - third material conveying part, 61 - shell, 62 - first support bottom plate, 63 - first mounting frame, 64 - operation panel, 71 - material visual detection structure, 72 - weighing structure. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be described clearly and completely below in combination with the drawings in the utility model embodiment. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other at will.

[0033] Please refer to Figures 1-14The utility model discloses a multi -stage screening device in tobacco shred purity detection, including primary material conveying piece 1, primary screening piece 2, secondary material conveying piece 3, secondary screening piece 4, tertiary material conveying piece 5, primary material conveying piece 1 is used to convey material to primary screening piece 2, and primary screening piece 2 is used to carry out first screening to material to screen out first impurity of the length exceeding first preset size in material and obtains first screening material, and secondary material conveying piece 3 is used to vibrate conveying first screening material to secondary screening piece 4, and secondary screening piece 4 is used to carry out again screening to first screening material to screen out second impurity of the length exceeding second preset size in first screening material and obtains second screening material, and first preset size is greater than second preset size, and tertiary material conveying piece 5 is used to convey second screening material to tobacco shred detection.

[0034] Here, the primary screening piece screens out the first impurities in the material that exceed the first preset size, thereby achieving first screening of the material to obtain the first screening material. The secondary material conveying piece vibrates the first screening material to the secondary screening piece. The secondary screening piece screens out the second impurities in the first screening material that exceed the second preset size, thereby achieving re-screening of the first screening material to obtain the second screening material. The primary screening piece and the secondary screening piece screen out different sizes of impurities mixed in the material, which helps subsequent tobacco shred purity detection.

[0035] Specifically, the tobacco shred detection piece can be provided at the tobacco shred detection position. The tobacco shred detection piece can include a material visual detection structure 71 and a weighing structure 72. The material visual detection structure 71 is arranged above the tertiary material conveying piece 5. The tertiary material conveying piece 5 conveys the second screening material to the field of view of the material visual detection structure 71. After the material visual detection structure 71 completes the work, the tertiary material conveying piece 5 conveys the second screening material to the weighing structure 72. The material visual detection structure 71 performs visual detection on the second screening material to obtain a material pattern. The weighing structure 72 measures the mass of the second screening material to obtain weight data. The material visual detection structure 71 can include a visual sensor to obtain real-time images of the material. The material visual detection structure 71 can include the detection device and the computer disclosed in CN115104757A, a tobacco shred foreign matter control system, electronic equipment and a storage medium. The detection device takes pictures of the material and transmits the pictures to the computer for processing. The computer identifies the pictures to obtain feature data of the pictures and determines whether there is foreign matter in the tobacco shred according to the feature data, thereby determining whether the tobacco shred is pure.

[0036] The multi-stage screening device in the tobacco shred purity detection in the embodiment can further include a protective frame, the protective frame including a first support bottom plate 62, an outer shell 61 connected to the first support bottom plate 62, a first material conveying element 1, a first screening element 2, a second material conveying element 3, a second screening element 4, and a third material conveying element 5, which are respectively arranged inside the outer shell 61 and are respectively connected to the first support bottom plate 62.

[0037] Specifically, the protective frame integrates and protects each component in the device. The operation panel 64 arranged on the outer shell 61 is used to facilitate the user to operate and control the running of the whole machine.

[0038] The first material conveying element 1 can include a first rack 11, a first conveyor 13, a material feeding bin 12, and a material guiding bin 14. The bottom of the first rack 11 is connected to the first support bottom plate 62. The first conveyor 13 is connected to the upper part of the first rack 11. The material feeding bin 12 is used to convey the material to the first conveyor 13. The first conveyor 13 is used to move the material upward to convey the material to the material guiding bin 14.

[0039] Specifically, the first rack 11 integrates and fixes each component of the first conveyor 13. The first conveyor 13 is a climbing conveyor, which conveys the material. The material feeding bin 12 is a manual feeding position, which can also be combined with an online device for automatic feeding.

[0040] The first conveyor 13 can include a first conveying belt and two first side plates arranged in parallel on both sides of the first conveying belt. The first conveying belt is used to receive the material falling from the material feeding bin 12 and convey the material upward to the material guiding bin 14. The first material conveying element 1 further includes an electric roller 15 rotatably connected to the two first side plates at both ends, respectively, and a first brush arranged on the electric roller 15 above the first conveying belt. The electric roller 15 is used to drive the first brush to rotate, so that the first brush is used to flatten the material on the first conveying belt.

[0041] Specifically, the electric roller 15 rotates at a constant speed, thereby driving the first brush to rotate at a constant speed. The first brush flattens the material conveyed on the first conveying belt, ensuring that the tobacco material moves uniformly on the first conveying belt to the maximum extent. The material guiding bin 14 is installed at the rear end of the first conveyor 13. The material guiding bin 14 can receive the material conveyed by the first conveyor 13, prevent the material from flying out, and guide the material into the first screening element 2. The material feeding bin 12 and the material guiding bin 14 are both provided with openings at the top and the bottom. The bottom of the material feeding bin 12 can be connected to the two first side plates, and the side of the material guiding bin 14 can be connected to the first rack 11.

[0042] The protective frame can further include a first mounting frame 63 connected to the first support bottom plate 62, and the first-stage screening member 2 includes a second rack 21, a first material screening bin 23, and a first driving structure 22. The bottom of the second rack 21 is connected to the first mounting frame 63, the first driving structure 22 is connected to the upper portion of the second rack 21, the first material screening bin 23 is used to receive the material falling from the material guide bin 14, the bottom of the first material screening bin 23 is provided with a plurality of strip-shaped first screening grooves, and the side of the first material screening bin 23 is connected to the first driving structure 22. The first driving structure 22 is used to drive the first material screening bin 23 to move left and right along the horizontal direction, so that the first material screening bin 23 is used to perform primary screening on the material to form first-screened material.

[0043] Specifically, the second rack 21 supports the first driving structure 22, and further functions as a height positioning structure for the first material screening bin 23, because the first-stage screening member 2 and the first-stage material conveying member 1 need to ensure the connection of material conveying. The first material screening bin 23 receives the material falling from the material guide bin 14, and the bin bottom is provided with a plurality of first screening grooves, which can ensure the screening of the material and do not affect the falling of the material. The first driving structure 22 drives the first material screening bin 23 to move uniformly in the horizontal direction. The first driving structure 22 can include a first sliding rail connected to the second rack 21, a first sliding block slidingly connected to the first sliding rail, and a first hydraulic cylinder used to drive the first sliding block to move. The first hydraulic cylinder is connected to the second rack 21, the first piston rod of the first hydraulic cylinder is connected to the first side of the first sliding block, and the first material screening bin 23 is connected to the second side of the first sliding block.

[0044] The second-stage material conveying member 3 can include a first support structure, a linear vibrating machine 32, and a material disc 31. The bottom of the first support structure is connected to the first mounting frame 63, the bottom of the linear vibrating machine 32 is connected to the upper portion of the first support structure, the material disc 31 is used to receive the first-screened material falling from the bottom of the first material screening bin 23, one side of the material disc 31 is provided with a first discharge port for the material to slide out, and the bottom of the material disc 31 is connected to the linear vibrating machine 32. The linear vibrating machine 32 is used to drive the material disc 31 to vibrate, so that the material disc 31 vibrates and conveys the first-screened material to the first discharge port.

[0045] Specifically, the material disc 31 can be horizontally arranged, and a guide protrusion can be arranged on the material disc 31. The axis of the guide protrusion can be parallel to the axis of the material disc 31, and the guide protrusion can ensure the material to move forward along the horizontal direction.

[0046] The first support structure can include a buffer plate 33, an air shock absorber 34, a first bearing plate 35, the bottom of the buffer plate 33 is connected to the first mounting frame 63, the top of the first bearing plate 35 is connected to the linear vibration machine 32, the top of the air shock absorber 34 is connected to the first bearing plate 35, and the bottom is connected to the buffer plate 33.

[0047] Specifically, the buffer plate 33 has a certain damping effect, and the buffer plate 33 is made of flexible material. The air shock absorber 34 can be four symmetrical. In the working of the linear vibration machine 32, the vibration amplitude is large and the vibration frequency is high, and general shock absorbers cannot achieve good results, so four air shock absorbers are used to reduce the vibration of the vibration machine.

[0048] The second screening member 4 can include a third rack 43, a second driving structure 42, and a second material screening bin 41. The bottom of the third rack 43 is connected to the first support bottom plate 62. The bottom of the second material screening bin 41 is provided with a mesh screening part. The second material screening bin 41 is used to receive the first screened material that slides down from the first discharge port of the material disc 31. The second driving structure 42 is connected to the third rack 43. The side of the second material screening bin 41 is connected to the second driving structure 42. The second driving structure 42 drives the second material screening bin 41 to move up and down along the vertical direction, so that the second material screening bin 41 re-screens the first screened material to form second screened material. The third material conveying member 5 is used to receive the second screened material falling from the second material screening bin 41 and convey the second screened material to the tobacco shred detection position.

[0049] Specifically, the third rack 43 can integrate the parts of the second screening member 4. The second driving structure 42 drives the second material screening bin 41 to reciprocate in the vertical direction, ensuring that the second screened material falls onto the third material conveying member 5. The mesh screening part can ensure that the material can fall sufficiently. The second driving structure 42 can include a second sliding rail connected to the third rack 43, a second sliding block slidingly connected to the second sliding rail, and a second hydraulic cylinder for driving the second sliding block to move. The second hydraulic cylinder is connected to the third rack 43. The second piston rod of the second hydraulic cylinder is connected to the bottom of the second sliding block. The second material screening bin 41 is connected to the side of the second sliding block.

[0050] The third rack 43 can be two symmetrical. The second screening member 4 further includes a guide rail buffer structure 44 with a spring built-in. One side of the second driving structure 42 and one side of the guide rail buffer structure 44 are respectively connected to the two third racks 43. The two sides of the second material screening bin 41 are respectively connected to the other side of the second driving structure 42 and the other side of the guide rail buffer structure 44. The guide rail buffer structure 44 is used to buffer the second material screening bin 41 when it moves up and down.

[0051] Specifically, the guide rail buffer structure 44 is internally provided with a spring, which plays a buffering role and protects the parts during the reciprocating movement of the second material screening bin 41. The guide rail buffer structure 44 can adopt the guide rail buffer disclosed in CN219602990U, a guide rail buffer of an elevator car frame.

[0052] The secondary screening member 4 can further include a material protection structure connected to the third rack 43 and used to protect the first screened material when the first screened material slides off the material disc 31. The material protection structure includes a first stop plate 451 arranged at the front side of the material disc 31, a second stop plate 452 arranged above the material disc 31, and two third stop plates 453 arranged at the left and right sides of the material disc 31, respectively. The two side ends of the two third stop plates 453 are connected to the first stop plate 451, and the top of the first stop plate 451 and the top of the two third stop plates 453 are connected to the second stop plate 452, respectively.

[0053] Specifically, the material protection structure can stop the first screened material when it slides off the material disc 31, preventing the first screened material from splashing to the outside. The first stop plate 451 can stop the material when it splashes toward the front side of the first discharge port of the material disc 31, the second stop plate 452 can stop the material when it splashes toward the direction of the material disc 31, one third stop plate 453 can stop the material when it splashes toward the left side of the material disc 31, and the other third stop plate 453 can stop the material when it splashes toward the right side of the material disc 31.

[0054] Specifically, the tertiary material conveying member 5 can include a belt conveyor used to convey the second screened material to the tobacco detection position.

[0055] Specifically, the present application has two screening members that screen different sizes of impurities in the tobacco. The first material screening bin 23 is included in the primary screening member 2, and the bottom of the first material screening bin 23 is provided with a plurality of first screening grooves. The second material screening bin 41 is included in the secondary screening member 4, and the bottom of the second material screening bin 41 is provided with a mesh screening portion. The first screening grooves and the mesh screening portion screen different sizes of impurities, respectively. The first screening grooves screen first impurities with a length exceeding a first preset size from the material, and the mesh screening portion screens second impurities with a length exceeding a second preset size from the first screened material.

[0056] Specifically, the discharge port of the first material conveying part 1 is connected with the feeding port of the first material screening bin 23 in the first screening part 2, the discharge port of the first screening part 2 is arranged above the material disc 31 of the second material conveying part 3, the first discharge port of the material disc 31 of the second material conveying part 3 is connected with the feeding port of the second material screening bin 41 in the second screening part 4, and the third material conveying part 5 is arranged below the discharge port of the second material screening bin 41 in the second screening part 4. The arrangement and connection of the whole device are as above, and a complete process of material feeding, conveying, screening, conveying, screening and conveying is formed. In the work of detecting the purity of tobacco shreds, the application greatly saves the labor cost and reduces the time required for the connection between processes, and the application comprises a three-stage conveying process and a two-stage screening process, and the material conveying and screening of each stage are all improvements of the previous stage, wherein the first brush is driven by the electric roller 15 to flatten the material, the first screening groove is arranged at the bottom of the first material screening bin 23, the mesh screening part is arranged at the bottom of the second material screening bin 41, and the second material screening bin 41 moves up and down along the vertical direction, which are all optimizations of selecting the material layer by layer, and the accuracy of detecting the purity of tobacco shreds is ensured.

[0057] The above description can be implemented alone or in various combinations, and these variants are within the protection scope of the application.

[0058] It should be noted that in the description of the application, the terms of orientation or position relationship "upper end", "lower end", "bottom end" are based on the orientation or position relationship shown in the drawings or the orientation or position relationship when the product of the application is used, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the application. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment containing a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including one" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0059] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not limit it. Although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A multi-stage screening device in tobacco purity detection, characterized in that: The device comprises a first material conveying part (1), a first screening part (2), a second material conveying part (3), a second screening part (4), and a third material conveying part (5). The first material conveying part (1) is used to convey the material to the first screening part (2). The first screening part (2) is used to preliminarily screen the material to remove first impurities with a length exceeding a first preset size and obtain first screened material. The second material conveying part (3) is used to vibrate the first screened material to the second screening part (4). The second screening part (4) is used to re-screen the first screened material to remove second impurities with a length exceeding a second preset size and obtain second screened material. The first preset size is greater than the second preset size. The third material conveying part (5) is used to convey the second screened material to a tobacco shred detection position.

2. A multi-stage screening device for tobacco purity detection according to claim 1, characterized in that: The device further comprises a protective frame, which comprises a first support bottom plate (62) and a shell (61) connected to the first support bottom plate (62). The first material conveying part (1), the first screening part (2), the second material conveying part (3), the second screening part (4), and the third material conveying part (5) are arranged inside the shell (61) and connected to the first support bottom plate (62), respectively.

3. A multi-stage screening apparatus for tobacco purity detection as claimed in claim 2, wherein: The first material conveying part (1) comprises a first rack (11), a first conveyor (13), a material feeding bin (12), and a material guiding bin (14). The bottom of the first rack (11) is connected to the first support bottom plate (62). The first conveyor (13) is connected to the upper part of the first rack (11). The material feeding bin (12) is used to convey the material to the first conveyor (13). The first conveyor (13) is used to move the material upward to convey the material to the material guiding bin (14).

4. A multi-stage screening apparatus for tobacco purity detection as claimed in claim 3, wherein: The first conveyor (13) comprises a first conveying belt and two first side plates arranged in parallel on both sides of the first conveying belt. The first conveying belt is used to receive the material falling from the material feeding bin (12) and convey the material upward to the material guiding bin (14). The first material conveying part (1) further comprises an electric roller (15) rotatably connected to the two first side plates at both ends, respectively, and a first brush arranged on the electric roller (15) above the first conveying belt. The electric roller (15) is used to rotate the first brush, so that the first brush is used to flatten the material on the first conveying belt.

5. A multi-stage screening apparatus for tobacco purity detection according to claim 3 or 4, characterised in that: The protective frame further comprises a first mounting frame (63) connected to the first supporting bottom plate (62), the first-level screening member (2) comprises a second rack (21), a first material screening bin (23), and a first driving structure (22), the bottom of the second rack (21) is connected to the first mounting frame (63), the first driving structure (22) is connected to the upper portion of the second rack (21), the first material screening bin (23) is used to receive the material falling from the material guide bin (14), the bottom of the first material screening bin (23) is provided with a plurality of strip-shaped first screening grooves, and the side of the first material screening bin (23) is connected to the first driving structure (22); the first driving structure (22) is used to drive the first material screening bin (23) to move left and right along the horizontal direction, so that the first material screening bin (23) is used to perform primary screening on the material to form first screened material.

6. A multi-stage screening apparatus for tobacco purity detection as claimed in claim 5, wherein: The second-level material conveying member (3) comprises a first supporting structure, a linear vibrator (32), and a material disc (31), the bottom of the first supporting structure is connected to the first mounting frame (63), the bottom of the linear vibrator (32) is connected to the upper portion of the first supporting structure, the material disc (31) is used to receive the first screened material falling from the bottom of the first material screening bin (23), one side of the material disc (31) is provided with a first discharge port for the material to slide out, and the bottom of the material disc (31) is connected to the linear vibrator (32); the linear vibrator (32) is used to drive the material disc (31) to vibrate, so that the material disc (31) vibrates and conveys the first screened material to the first discharge port.

7. A multi-stage screening apparatus for tobacco purity detection as claimed in claim 6, characterised in that: The first supporting structure comprises a buffer plate (33), an air-filled shock absorber (34), and a first bearing plate (35), the bottom of the buffer plate (33) is connected to the first mounting frame (63), the top of the first bearing plate (35) is connected to the linear vibrator (32), and the top of the air-filled shock absorber (34) is connected to the first bearing plate (35), and the bottom of the air-filled shock absorber (34) is connected to the buffer plate (33).

8. A multi-stage screening apparatus for tobacco purity detection as claimed in claim 6, wherein: The second-level screening member (4) comprises a third rack (43), a second driving structure (42), and a second material screening bin (41), the bottom of the third rack (43) is connected to the first supporting bottom plate (62), the bottom of the second material screening bin (41) is provided with a mesh screening portion, the second material screening bin (41) is used to receive the first screened material sliding from the first discharge port of the material disc (31), the second driving structure (42) is connected to the third rack (43), and the side of the second material screening bin (41) is connected to the second driving structure (42); the second driving structure (42) is used to drive the second material screening bin (41) to move up and down along the vertical direction, so that the second material screening bin (41) performs secondary screening on the first screened material to form second screened material; and the third-level material conveying member (5) is used to receive the second screened material falling from the second material screening bin (41) and convey the second screened material to a tobacco detection position.

9. A multi-stage screening apparatus for tobacco purity detection as claimed in claim 8, wherein: The third rack (43) is symmetrically arranged in two, the secondary screening device (4) further comprises a guide rail buffer structure (44) with spring built-in, one side of the second driving structure (42) and one side of the guide rail buffer structure (44) are respectively connected to the two third racks (43), two sides of the second material screening bin (41) are respectively connected to the other side of the second driving structure (42) and the other side of the guide rail buffer structure (44), the guide rail buffer structure (44) is used to buffer the second material screening bin (41) when the second material screening bin (41) moves up and down.

10. A multi-stage screening apparatus for tobacco purity detection as claimed in claim 8, wherein: The secondary screening device (4) further comprises a material protection structure connected to the third rack (43) and used to protect the first screened material when the first screened material slides down from the material disc (31), the material protection structure comprises a first stop plate (451) arranged at the front side of the first discharge port of the material disc (31), a second stop plate (452) arranged above the material disc (31), and two third stop plates (453) respectively arranged at the left and right sides of the material disc (31), two sides of the two third stop plates (453) are respectively connected to the first stop plate (451), the top of the first stop plate (451) and the top of the two third stop plates (453) are respectively connected to the second stop plate (452).

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