Multi-stage screening device for tobacco shreds

Abstract

The invention discloses a multistage screening device for tobacco shreds, and belongs to the technical field of tobacco shred screening. The multistage screening device comprises a frame body and a conveying belt arranged at the upper end of the frame body, a conveying bin is arranged on one side of the conveying belt, a driving assembly is arranged in the conveying bin, and a smoothing roller is rotationally installed in the conveying bin; a multi-stage vibration screening mechanism, an auxiliary screening mechanism and a protection fitting mechanism are arranged in the screening bin; by arranging the multi-stage vibration screening mechanism, tobacco shreds can be pretreated in advance, by combining with the auxiliary screening mechanism, a shifting plate shifts the tobacco shreds on the surface of a screen, screening can be assisted, and the tobacco shred screening effect of the device is improved; and finally, in combination with a protection attaching mechanism, the bottom of the contact plate is always attached to the surface of the screen, and the screen is protected against damage.

Description

Technical Field

[0001] The invention relates to a multi-stage screening device for shredded tobacco, belonging to the technical field of shredded tobacco screening. Background Art

[0002] Multi-stage screening device for tobacco shreds refers to the use of multi-stage screening equipment to screen and classify tobacco leaves or shreds in tobacco processing and production. This device is usually used in the tobacco processing link on the tobacco processing production line to classify the shredded tobacco and remove impurities and fibers to obtain shredded tobacco particles that meet the requirements; When the current tobacco screening device is in use, the tobacco is in a thin strip shape and is easily entangled and combined together, which is not conducive to subsequent screening processing; at the same time, when the tobacco is screened, the tobacco will remain on the surface of the screen, thereby affecting the subsequent estimation and processing of the data. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art. In the existing tobacco screening device, due to the thin strip structure of the tobacco itself, it is easy to entangle and combine together, which is not conducive to subsequent screening processing. At the same time, after screening, it is impossible to count the tobacco remaining on the surface of the screen, which is not conducive to the subsequent estimation and processing of the data.

[0004] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions: A multi-stage screening device for shredded tobacco is provided, comprising: a frame and a conveyor belt arranged at the upper end of the frame, a feeding bin is arranged on one side of the conveyor belt, a driving assembly is arranged inside the feeding bin, and a smoothing roller is rotatably installed inside the feeding bin; The side wall of the frame is provided with a screening chamber, and a multi-stage vibration screening mechanism is provided inside the screening chamber; the multi-stage vibration screening mechanism includes a screen and a vibration plate, which are installed below the screen in the vertical direction, and the screen is arranged in multiple groups; A moving rod is installed through the interior of the screening bin, and an auxiliary screening mechanism is provided at one end of the moving rod; the auxiliary screening mechanism comprises a transmission assembly and a disc rod; the transmission assembly is rotatably connected with the disc rod, and the auxiliary screening mechanism drives the transmission assembly to rotate the disc rod through the moving rod, thereby assisting in screening the screen; A contact plate is provided inside the screening bin, the lower end of the contact plate in the vertical direction is in contact with the screen, and a protective contact mechanism is provided at the upper end of the contact plate in the vertical direction; the protective contact mechanism comprises a positioning rod, a buffer block and a return spring, the positioning rod is slidably connected with the buffer block, the return spring is sleeved on the surface of the positioning rod and is engaged with the buffer block; the positioning rod is used to provide a path for the buffer block to move, so that the return spring is used to provide protection when the auxiliary screening mechanism contacts the screen; The driving assembly is connected to the smoothing roller.

[0005] Furthermore, the multi-stage vibration screening mechanism also includes a driving motor, a rotating rod and a cam; A driving motor is installed on the side wall of the screening bin, and the output end of the driving motor is fixedly connected to the rotating rod. A cam is installed on the surface of the rotating rod, and one end of the cam is in contact with the vibration plate.

[0006] Furthermore, the screen is provided with three groups, the surface of the screen is provided with holes, the size of each group of holes is the same, and the size of the holes in the vertical direction decreases from top to bottom; A gear is fixedly mounted on one side of the rotating rod, a rack is meshingly mounted on the outer side of the gear, and the rotating rods of adjacent groups rotate synchronously through the gear and the rack.

[0007] Furthermore, a vibration spring is arranged between the vibration plate and the screening bin, and a feeding hole is arranged inside the vibration plate.

[0008] Furthermore, a telescopic rod is installed between the vibration plate and the screen, a weighing device is installed at one end of the vibration plate, the weighing device is located below the screen in the vertical direction, a collecting chute is installed on the side wall of the screen, the collecting chute is connected to the collecting box, and the collecting box runs through the screening bin; Wherein, the collecting chutes corresponding to the adjacent groups of the screens are arranged opposite to the collecting boxes.

[0009] Furthermore, the transmission assembly includes a first cone wheel and a second cone wheel; the first cone wheel is fixedly mounted on one end of a rotating rod; the first cone wheel is meshed with one end of the second cone wheel, and the other end of the second cone wheel is rotatably connected to a disc rod, and a limiting kit is installed through the middle end of the disc rod, and the limiting kit is installed on the side wall of the screening bin by bolts.

[0010] Furthermore, a round rod is installed on the surface of the disc rod, a moving rod is nested in the round rod, the moving rod passes through the screening bin, and a dial plate is installed at one end of the moving rod.

[0011] Furthermore, the protective fitting mechanism also includes a buffer rod, the positioning rod is vertically installed at the lower end of the dial plate, one end of the buffer block is rotatably connected to one end of the buffer rod, and the other end of the buffer rod is rotatably connected to the contact plate.

[0012] Furthermore, a damping rod is fixedly installed between the shift plate and the contact plate, a baffle is installed on the surface of the contact plate, a limiting groove is provided on the surface of the shift plate, and the baffle is slidably connected in the limiting groove.

[0013] Furthermore, a detector is fixedly mounted on the front end of the frame, and the detector is aligned with the surface of the conveyor belt.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is provided with a feeding bin capable of automatically conveying and smoothing, and a conveyor belt capable of conveying tobacco is provided at the upper end of the frame. Before screening the tobacco, the tobacco is put into the feeding bin, and the smoothing roller is started by the driving component. The start of the smoothing roller drives the tobacco to be spread on the conveyor belt for transportation. After the tobacco is spread, it is detected by a detector, and the bad tobacco can be detected. The tobacco is transported to the screening bin through the conveyor belt, so that subsequent screening can be carried out, and the tobacco can be pre-treated in advance, which can provide a better screening effect; combined with a multi-stage vibration screening mechanism, when the tobacco enters the screening bin, the driving motor is started, the rotating rod is rotated, and the vibration plate is driven to move upward, thereby driving the screen to vibrate.

[0015] 2. The present invention sets a paddle for assisting screening on the surface of the screen, and then uses a transmission assembly to drive the disc rod to rotate, so that the paddle can push away the tobacco on the surface of the screen, which can assist in screening and improve the effect of the device in screening tobacco.

[0016] 3. The present invention arranges a shock-absorbing assembly between the contact plate and the paddle plate when the paddle plate performs auxiliary screening, thereby utilizing the elastic force of the reciprocating vibration of the return spring to ensure that the bottom of the contact plate always fits the surface of the screen, thereby protecting the screen from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 Shown is a schematic diagram of the three-dimensional structure of the frame of the present invention; Figure 3 The figure shows a three-dimensional structural schematic diagram of the feed bin of the present invention; Figure 4 The figure shows a schematic diagram of the conveyor belt structure from a top view of the present invention; Figure 5 Shown is a schematic diagram of the screening bin structure of the present invention; Figure 6 The figure shows a schematic diagram of the side cross-sectional structure of the screening bin according to the first embodiment of the present invention; Figure 7 The figure shows a schematic diagram of the side cross-sectional structure of the rack according to the first embodiment of the present invention; Figure 8 The figure shows a front cross-sectional structural schematic diagram of a paddle according to a third embodiment of the present invention; Fig. 9 The figure shows a schematic diagram of the top view of the screening bin according to the second embodiment of the present invention; Fig.10 The figure shows a schematic diagram of the side cross-sectional structure of the paddle according to the third embodiment of the present invention.

[0018] Reference numerals: 1. Frame; 2. Conveyor belt; 3. Detector; 4. Feed bin; 5. Smoothing roller; 6. Driving assembly; 7. Screening bin; 8. Vibrating plate; 9. Screen; 10. Driving motor; 11. Rotating rod; 12. Cam; 13. Vibrating spring; 14. Weighing device; 15. Telescopic rod; 16. Feeding hole; 17. Collecting chute; 18. Collecting box; 19. Bottom discharge bin; 20. Gear; 21. Rack; 22. First cone wheel; 23. Second cone wheel; 24. Disc rod; 25. Limit kit; 26. Round rod; 27. Moving rod; 28. Dial plate; 29. ​​Positioning rod; 30. Buffer block; 31. Buffer rod; 32. Contact plate; 33. Reset spring; 34. Damping rod; 35. Baffle; 36. Limiting groove. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances. Embodiment 1:

[0021] A multi-stage screening device for shredded tobacco is provided, comprising: a frame 1 and a conveyor belt 2 arranged at the upper end of the frame 1, a feed bin 4 is arranged on one side of the conveyor belt 2, a driving assembly 6 is arranged inside the feed bin 4, and a smoothing roller 5 is rotatably installed inside the feed bin 4; a detector 3 is fixedly installed at the front end of the frame 1, the detector 3 is aligned with the surface of the conveyor belt 2, and a bottom discharge bin 19 is arranged at the lower end of the screening bin 7.

[0022] The side wall of the frame 1 is provided with a screening bin 7, and a multi-stage vibrating screening mechanism is provided inside the screening bin 7; the multi-stage vibrating screening mechanism includes a screen 9 and a vibrating plate 8, which are installed below the screen 9 in the vertical direction, and the screen 9 is arranged in multiple groups.

[0023] The multi-stage vibration screening mechanism also includes a driving motor 10, a rotating rod 11 and a cam 12; A driving motor 10 is installed on the side wall of the screening bin 7 , and the output end of the driving motor 10 is fixedly connected to a rotating rod 11 . A cam 12 is installed on the surface of the rotating rod 11 , and one end of the cam 12 is in contact with the vibration plate 8 .

[0024] The sieves 9 are provided in three groups. Holes are provided on the surface of the sieves 9. The holes in each group have the same size. The size of the holes in the vertical direction decreases from top to bottom.

[0025] A vibration spring 13 is arranged between the vibration plate 8 and the screening bin 7 , and a feeding hole 16 is arranged inside the vibration plate 8 .

[0026] A telescopic rod 15 is installed between the vibration plate 8 and the screen 9, a weighing device 14 is installed at one end of the vibration plate 8, and the weighing device 14 is located below the screen 9 in the vertical direction. A collecting chute 17 is installed on the side wall of the screen 9, and the collecting chute 17 is connected to a collecting box 18, and the collecting box 18 passes through the screening bin 7; The collecting chutes 17 and the collecting boxes 18 corresponding to the adjacent groups of the screens 9 are arranged opposite to each other.

[0027] The multi-stage vibration screening mechanism includes a screen 9, a vibration plate 8, a drive motor 10, a rotating rod 11 and a cam 12; inside the screening bin 7, the screen 9 is arranged in multiple stages, and the grid gap gradually decreases from top to bottom, so as to classify tobacco of different particle sizes; a vibration plate 8 is installed below the screen 9, and the driving force is transmitted by the up and down movement of the vibration plate 8, so that the screen 9 vibrates, thereby completing the screening process of tobacco; at the same time, a telescopic rod 15 is set between the vibration plate 8 and the screen 9, so that data can be collected by telescoping and then using a weighing device 14; a weighing device 14 is installed at the middle end of the vibration plate 8, which detects the weight of the screen 9 and the tobacco above it in real time, and provides accurate screening data support for the staff. After screening, the tobacco falls into the collection box 18 through the chute on the side wall of the screen 9, and tobacco of different particle sizes is orderly classified.

[0028] At the beginning of the screening process, after the tobacco enters the screening bin 7 through the conveyor belt 2, the drive motor 10 is started. The drive motor 10 transmits the rotational power through the rotating rod 11, driving the cam 12 fixed on its surface to rotate. As the cam 12 rotates, the vibration plate 8 is periodically squeezed and moves upward. The vibration spring 13 connected to it provides a rebound force when the cam 12 stops squeezing, so that the vibration plate 8 continues to vibrate; this up and down alternating movement is transmitted to the screen 9 through the telescopic rod 15, causing the tobacco to spread evenly on the surface of the screen 9. Smaller-sized tobacco can smoothly pass through the mesh and fall into the lower screen 9 or the feed hole 16, while larger-sized tobacco remains in the upper screen 9 for further screening.

[0029] Since three groups of sieves 9 are provided, a gear 20 is fixedly installed on one side of the rotating rod 11, and a rack 21 is meshingly installed on the outer side of the gear 20. The rotating rods 11 of adjacent groups rotate synchronously through the gear 20 and the rack 21, thereby realizing synchronous screening of multiple groups of sieves 9. Embodiment 2:

[0030] A frame 1 and a conveyor belt 2 are arranged on the upper end of the frame 1, a feed bin 4 is arranged on one side of the conveyor belt 2, a driving component 6 is arranged inside the feed bin 4, and a smoothing roller 5 is rotatably installed inside the feed bin 4; a detector 3 is fixedly installed at the front end of the frame 1, and the detector 3 is aligned with the surface of the conveyor belt 2.

[0031] A moving rod 27 is installed through the interior of the screening bin 7, and an auxiliary screening mechanism is provided at one end of the moving rod 27; the auxiliary screening mechanism includes a transmission assembly and a disc rod 24; the transmission assembly is rotatably connected to the disc rod 24, and the auxiliary screening mechanism drives the transmission assembly to rotate the disc rod 24 through the moving rod 27, thereby assisting in screening the screen 9.

[0032] The transmission assembly includes a first cone wheel 22 and a second cone wheel 23; the first cone wheel 22 is fixedly mounted on one end of the rotating rod 11; the first cone wheel 22 is meshed with one end of the second cone wheel 23, and the other end of the second cone wheel 23 is rotatably connected to a disc rod 24, and a limiting kit 25 is installed through the middle end of the disc rod 24, and the limiting kit 25 is installed on the side wall of the screening bin 7 by bolts.

[0033] A round rod 26 is installed on the surface of the disc rod 24 , and a moving rod 27 is nested and installed on the round rod 26 . The moving rod 27 passes through the screening bin 7 , and a dial plate 28 is installed at one end of the moving rod 27 .

[0034] The auxiliary screening mechanism is designed to effectively solve the problem that tobacco shreds are easily accumulated and entangled during the screening process. A moving rod 27 is installed inside the screening bin 7, and the right end of the moving rod 27 is provided with an auxiliary screening mechanism; the core of the auxiliary screening mechanism is to realize the movement of the dial plate 28 through the gear 20 transmission and the limit device; specifically, the right end of the moving rod 27 is connected to the rotating rod 11 through the first cone wheel 22, and the first cone wheel 22 engages to drive the second cone wheel 23, so that the rotating rod 11 drives the first cone wheel 22 to rotate, and then the first cone wheel 22 engages to drive the second cone wheel 23 to rotate, and the second cone wheel 23 is fixed by the limiting 25 kit, and then the second cone wheel 23 drives the disc rod 24 to rotate, and the surface of the disc rod 24 is provided with a round rod 26, and the round rod 26 slides in the groove on the surface of the disc rod 24, so as to drive the moving rod 27 to repeatedly push the dial plate 28.

[0035] During the screening process, when the rotating rod 11 rotates, its power is transmitted to the second cone wheel 23 through the first cone wheel 22 and drives the disc rod 24. The rotation of the disc rod 24 further drives the nested round rod 26 to move the moving rod 27; a paddle 28 is fixed to the left end of the moving rod 27, and the paddle 28 paddles and disperses the tobacco accumulated on the surface of the screen 9 under the guidance of the movement of the moving rod 27; the paddle 28 can not only prevent the tobacco from accumulating on the surface of the screen 9 and affecting the screening efficiency, but also promote the tobacco to be more evenly distributed on the screen 9. Embodiment three:

[0036] A frame 1 and a conveyor belt 2 are arranged on the upper end of the frame 1, a feed bin 4 is arranged on one side of the conveyor belt 2, a driving component 6 is arranged inside the feed bin 4, and a smoothing roller 5 is rotatably installed inside the feed bin 4; a detector 3 is fixedly installed at the front end of the frame 1, and the detector 3 is aligned with the surface of the conveyor belt 2.

[0037] A contact plate 32 is provided inside the screening bin 7, and the lower end of the contact plate 32 in the vertical direction is in contact with the screen 9, and the upper end of the contact plate 32 in the vertical direction is provided with a protective fitting mechanism; the protective fitting mechanism includes a positioning rod 29, a buffer block 30 and a reset spring 33, the positioning rod 29 is slidably connected to the buffer block 30, and the reset spring 33 is sleeved on the surface of the positioning rod 29 and clamped with the buffer block 30; the positioning rod 29 is used to provide a path for the buffer block 30 to move, so that the reset spring 33 is used to provide protection when the auxiliary screening mechanism contacts the screen 9.

[0038] The protective fitting mechanism also includes a buffer rod 31, the positioning rod 29 is vertically installed at the lower end of the dial plate 28, one end of the buffer block 30 is rotatably connected to one end of the buffer rod 31, and the other end of the buffer rod 31 is rotatably connected to the contact plate 32.

[0039] A damping rod 34 is fixedly installed between the dial plate 28 and the contact plate 32 . A baffle plate 35 is installed on the surface of the contact plate 32 . A limiting groove 36 is provided on the surface of the dial plate 28 . The baffle plate 35 is slidably connected in the limiting groove 36 .

[0040] The protective fitting mechanism is intended to solve the problem that the screen 9 is easily damaged. A contact plate 32 is provided inside the screening chamber 7, and its lower end always fits the screen 9 to ensure that the surface of the screen 9 is always evenly supported during the vibration screening process. The upper end of the contact plate 32 is connected to the dial plate 28 through the protective fitting mechanism.

[0041] The protective fitting mechanism includes a positioning rod 29, a buffer block 30, a buffer rod 31, a reset spring 33 and a damping rod 34; when the paddle plate 28 pushes the tobacco on the surface of the screen 9, the contact plate 32 will be affected by the vibration force of the screen 9. At this time, the screen 9 presses the contact plate 32 to push the contact plate 32 upward, and at the same time, the force is transmitted to the buffer block 30 through the rotation of the buffer rod 31. When the buffer block 30 slides along the positioning rod 29, it squeezes the reset spring 33, and the reset spring 33 stores elastic force due to being squeezed; when the external pressure is released, the reset spring 33 resets the buffer block 30 through elastic force, and the contact plate 32 also returns to its original position. The whole process forms a set of elastic buffering mechanism, which effectively absorbs and disperses the impact force of vibration on the screen 9, and significantly reduces the loss of the screen 9.

[0042] The protective fitting mechanism is also provided with a damping rod 34 between the contact plate 32 and the shifting plate 28. The damping rod 34 acts as a pressure relief when the reset spring 33 reciprocates to further dissipate the vibration force, thereby reducing the aftershock effect of the reset spring 33. The contact plate 32 always maintains a fitting state with the surface of the screen 9 to avoid damage to the screen 9 due to uneven force during vibration.

[0043] In order to prevent tobacco or other impurities from entering the interior of the shock absorbing assembly, a baffle 35 is provided on the outer side of the upper end of the contact plate 32. The baffle 35 corresponds to the limit groove 36 at the bottom of the paddle 28. When the shock absorbing assembly is running, the baffle 35 can block tobacco from entering the interior, preventing impurities from causing wear or clogging of the assembly, thereby extending the service life of the device.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-stage screening device for shredded tobacco, characterized in that: include: A frame (1) and a conveyor belt (2) arranged at the upper end of the frame (1); a feed bin (4) is arranged on one side of the conveyor belt (2); a drive assembly (6) is arranged inside the feed bin (4); and a smoothing roller (5) is rotatably installed inside the feed bin (4); The side wall of the frame (1) is provided with a screening chamber (7), and a multi-stage vibrating screening mechanism is provided inside the screening chamber (7); the multi-stage vibrating screening mechanism comprises a screen (9) and a vibrating plate (8), which is installed below the screen (9) in a vertical direction, and the screen (9) is arranged in multiple groups; A moving rod (27) is installed through the interior of the screening bin (7), and an auxiliary screening mechanism is provided at one end of the moving rod (27); the auxiliary screening mechanism comprises a transmission assembly and a disc rod (24); the transmission assembly is rotatably connected to the disc rod (24), and the auxiliary screening mechanism drives the transmission assembly to rotate the disc rod (24) via the moving rod (27), thereby assisting in screening the screen (9); A contact plate (32) is provided inside the screening bin (7), the lower end of the contact plate (32) in the vertical direction is in contact with the screen (9), and a protective contact mechanism is provided at the upper end of the contact plate (32) in the vertical direction; the protective contact mechanism comprises a positioning rod (29), a buffer block (30) and a return spring (33); the positioning rod (29) is slidably connected to the buffer block (30), and the return spring (33) is sleeved on the surface of the positioning rod (29) and is engaged with the buffer block (30); the positioning rod (29) is used to provide a path for the buffer block (30) to move, so that the return spring (33) is used to provide protection when the auxiliary screening mechanism contacts the screen (9); The driving assembly (6) is connected to the smoothing roller (5).

2. The multi-stage screening device for shredded tobacco according to claim 1, characterized in that: The multi-stage vibration screening mechanism further comprises a driving motor (10), a rotating rod (11) and a cam (12); A drive motor (10) is installed on the side wall of the screening bin (7), the output end of the drive motor (10) is fixedly connected to a rotating rod (11), a cam (12) is installed on the surface of the rotating rod (11), and one end of the cam (12) is in contact with the vibration plate (8).

3. The multi-stage screening device for shredded tobacco according to claim 2, characterized in that: The screen (9) is provided in three groups, and holes are provided on the surface of the screen (9), the size of the holes in each group is the same, and the size of the holes in the vertical direction decreases from top to bottom in each group; A gear (20) is fixedly mounted on one side of the rotating rod (11), a rack (21) is meshingly mounted on the outer side of the gear (20), and the rotating rods (11) of adjacent groups rotate synchronously via the gear (20) and the rack (21).

4. The multi-stage screening device for shredded tobacco according to claim 1, characterized in that: A vibration spring (13) is provided between the vibration plate (8) and the screening bin (7), and a material discharge hole (16) is provided inside the vibration plate (8).

5. The multi-stage screening device for shredded tobacco according to claim 1, characterized in that: A telescopic rod (15) is installed between the vibration plate (8) and the screen (9); a weighing device (14) is installed at one end of the vibration plate (8); the weighing device (14) is located below the screen (9) in the vertical direction; a collecting chute (17) is installed on the side wall of the screen (9); the collecting chute (17) is connected to a collecting box (18); and the collecting box (18) passes through the screening bin (7); The collecting chutes (17) corresponding to the screens (9) of adjacent groups are arranged opposite to the collecting boxes (18).

6. The multi-stage screening device for shredded tobacco according to claim 1, characterized in that: The transmission assembly comprises a first cone wheel (22) and a second cone wheel (23); the first cone wheel (22) is fixedly mounted on one end of the rotating rod (11); the first cone wheel (22) is meshed with one end of the second cone wheel (23); the other end of the second cone wheel (23) is rotatably connected to a disc rod (24); a limit stop kit (25) is installed through the middle end of the disc rod (24); and the limit stop kit (25) is mounted on the side wall of the screening bin (7) by means of bolts.

7. The multi-stage screening device for shredded tobacco according to claim 6, characterized in that: A round rod (26) is mounted on the surface of the disc rod (24), a moving rod (27) is nested in the round rod (26), the moving rod (27) passes through the screening bin (7), and a dial plate (28) is mounted on one end of the moving rod (27).

8. The multi-stage screening device for shredded tobacco according to claim 1, characterized in that: The protective fitting mechanism further comprises a buffer rod (31), the positioning rod (29) being mounted on the lower end of the dial plate (28) in the vertical direction, one end of the buffer block (30) being rotatably connected to one end of the buffer rod (31), and the other end of the buffer rod (31) being rotatably connected to the contact plate (32).

9. The multi-stage screening device for shredded tobacco according to claim 8, characterized in that: A damping rod (34) is fixedly mounted between the shifting plate (28) and the contact plate (32); a baffle (35) is mounted on the surface of the contact plate (32); a limiting groove (36) is provided on the surface of the shifting plate (28); and the baffle (35) is slidably connected in the limiting groove (36).

10. The multi-stage screening device for shredded tobacco according to claim 1, characterized in that: A detector (3) is fixedly mounted on the front end of the frame (1), and the detector (3) is aligned with the surface of the conveyor belt (2).

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