Long and short tobacco stem separating device

Abstract

A long and short tobacco stem separating device comprises a plurality of parallel screen rollers, the autorotation directions of the screen rollers are the same, a gap between any two adjacent screen rollers is a roller gap, and the narrowest position of the roller gap is smaller than the diameter of a tobacco stem. The screening device has the beneficial effects that compared with the prior art, the multiple screening rollers are arranged, the chance that tobacco stems roll to the roller gaps along the roller faces is utilized, the upper portions of the roller gaps are wide, the lower portions of the roller gaps are narrow, when the tobacco stems reach the lowest positions of the roller gaps, the axial direction of the tobacco stems is forced to be consistent with the axial directions of the screening rollers and the screening grooves, more chance that short stems are separated is obtained, and the screening efficiency is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco leaf redrying, and in particular relates to a device for separating long and short tobacco stems. Background Art

[0002] At present, in the field of tobacco redrying technology, it is necessary to separate the long stems and short stems of tobacco stems.

[0003] The traditional device for separating long and short tobacco stems is disclosed in patent document CN102342595 A. Since the direction of short stems is disordered, when they pass through the sieve holes, if the axial direction of the short stems is different from the axial direction of the sieve holes, the short stems will miss the opportunity to be separated, resulting in low screening efficiency. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to design a device for separating long and short tobacco stems to improve the screening efficiency.

[0005] The specific plan is as follows: A device for separating long and short tobacco stems comprises a plurality of parallel screen rollers, the self-rotation directions of the screen rollers being the same, the gap between any two adjacent screen rollers being the roller gap, and the narrowest part of the roller gap being smaller than the diameter of the tobacco stems.

[0006] A plurality of screen grooves are distributed on the outer surface of the screen roller. The screen grooves are strip-shaped, and their axial directions are parallel to the axial direction of the screen roller.

[0007] The depth and width of the sieve slot are equivalent to the diameter of the tobacco stem, so that one sieve slot can only accommodate one short stem.

[0008] Several screen grooves form a screen groove ring, and the screen groove ring is evenly distributed on the outer surface of the screen roller.

[0009] A smooth roller is arranged between any two adjacent screen rollers, and the gap between the screen rollers and the smooth roller is also the roller gap.

[0010] All the screen rollers are distributed on a spatial plane, and the narrowest points of all roller gaps are also on this spatial plane.

[0011] Four screen rollers are provided.

[0012] A combination of long and short stem separation devices for tobacco stems, comprising several parallel arranged long and short stem separation devices as described above, wherein the screen rollers of the above-mentioned long and short stem separation devices are all on the same plane, and the gap between two adjacent long and short stem separation devices is also the roller gap. Calculated from the upstream material input direction, the length of the screen groove of the screen roller of the first long and short stem separation device is a, the length of the screen groove of the screen roller of the second long and short stem separation device is b, and the length of the screen groove of the screen roller of the third long and short stem separation device is N.

[0013] Beneficial effect: Compared with the prior art, the present invention is provided with a plurality of screen rollers, which utilize the opportunity that the tobacco stems roll along the roller surface to the roller gap. The roller gap is wide at the top and narrow at the bottom. When the tobacco stems reach the lowest point of the roller gap, the axial direction of the tobacco stems is forced to be consistent with the axial direction of the screen roller and the screen slot. Short stems get more opportunities to be separated, and the screening efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram (1) of the present invention.

[0015] Figure 2 yes Figure 1 Enlarged schematic diagram of the separation tank.

[0016] Figure 3 It is a schematic diagram (2) of the present invention. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0018] like Figure 1-2 A device for separating long and short tobacco stems comprises a plurality of parallel screen rollers 10, the screen rollers 10 rotate in the same direction, the gap between any two adjacent screen rollers 10 is a roller gap 11, and the narrowest part of the roller gap 11 is smaller than the diameter of the tobacco stems.

[0019] A plurality of sieve grooves 21 are distributed on the outer surface of the sieve roller 10 . The sieve grooves 21 are strip-shaped, and their axial directions are parallel to the axial direction of the sieve roller 10 .

[0020] In order to facilitate screening, the depth and width of the screening slot 21 are equivalent to the diameter of the tobacco stem, so that one screening slot 21 can only accommodate one short stem.

[0021] In order to facilitate processing, a plurality of screen grooves 21 form a screen groove ring 20 , and the screen groove ring 20 is evenly distributed on the outer surface of the screen roller 10 .

[0022] In order to facilitate screening, all the screen rollers 10 are distributed on a spatial plane, and the narrowest points of all the roller gaps 11 are also on the spatial plane.

[0023] In this way, the upper half surface of the screen roller 10 (that is, the upper half surface between the narrowest parts of the roller gaps on both sides) is the screening surface 13, and the screening surface reaches the maximum, which is convenient for screening.

[0024] Four screen rollers 10 are provided.

[0025] In practice, part of the tobacco stem is located in the screen slot 21 and the other part is located outside the screen slot 21. When the two opposite screen slots 21 reach the narrowest part of the roller gap 11, blockage may occur. For this purpose, the following improvements are made: like Figure 3A roller 40 is provided between any two adjacent screen rollers 10 , and the gap between the screen roller 10 and the roller 40 is also a roller gap 11 .

[0026] The specific working process of the tobacco stem long and short stem separation device is as follows: like Figure 1-2 , see Figure 2 The arrow direction in the figure is explained by taking "the screen roller 10 rotates counterclockwise and the tobacco stems are conveyed from right to left" as an example.

[0027] When the tobacco stems fall into the first (counting from the right, the same below) roller gap 11, the screening surface 13 on the left side thereof moves upward, and the screening surface 13 on the right side thereof moves downward.

[0028] For the initial tobacco stems, they always reach the narrowest part of the roller gap 11, where the tobacco stems have four basic movements: S1, the first type: the tobacco stems move upward along the left screening surface 13, pass the highest point of the screening roller 10, and enter the next roller gap 11 from the current roller gap 11; S2, the second type: the tobacco stems move upward along the left screening surface 13, leave the screening surface 13 without crossing the highest point of the screening roller 10, and then gradually move to the right, and finally reach the right screening surface 13 and move downward to the narrowest point of the roller gap 11; S3, the third type: the tobacco stems enter the sieve slot 21 of the left sieve surface 13, and as the sieve roller 10 rotates, they pass the highest point of the sieve roller 10 and then run to the sieve surface 13 position on the right side of the next roller gap 11; S4, the fourth type: the tobacco stems move upward along the screening surface 13 on the left, leave the screening surface 13 without crossing the highest point of the screening roller 10, then gradually move rightward, fall into the screening groove 21 on the right screening surface 13, move downward, and reach the narrowest part of the roller gap 11. When they move to the lower surface of the screening roller 10, they rely on their own gravity to fall off from the screening groove 21 and leave the tobacco stem long and short stem separation device.

[0029] Since the movements of long stems and short stems are different, they are explained as follows: S10, long stem For the long stems, if it is the first movement, it will reach the narrowest part of the second roller gap 11, and then repeat the first or second movement. If it is still the first movement, it will reach the narrowest part of the third roller gap 11, and so on. The long stems will leave the last screen roller 10, thereby leaving the tobacco stem long and short stem separation device and entering the downstream long stem collection device.

[0030] If the long stems perform the second movement at the narrowest part of a roller gap 11, they will reach the narrowest part of the roller gap 11 again and choose between the first movement and the second movement again. In this way, the long stems will either perform the first movement, gradually leave the long and short stem separation device of the tobacco stems, and enter the downstream long stem collection device; or perform an internal cycle of the second movement. As the number of internal cycles increases, they will eventually perform the first movement, leave the long and short stem separation device of the tobacco stems, and enter the downstream long stem collection device.

[0031] Finally, the long stems leave from the leftmost side of the tobacco stem long-short stem separation device and enter the downstream long stem collection device.

[0032] S20, short stem For short stems, no matter it is the first movement or the second movement, it will be reselected at the narrowest part of the roller gap 11. As the number of internal cycles increases, for short stems, the fourth movement or the third movement will be finally selected.

[0033] If it is the fourth movement, the tobacco will fall off from the screen groove 21 of the right screen roller 10 of the roller gap 11 and leave the long and short stems separation device; if it is the third movement, the second half of the fourth movement will be carried out in the next roller gap 11, and finally leave the long and short stems separation device.

[0034] Finally, the short stems leave from the bottom of the tobacco stem long-short stem separation device and enter the downstream short stem collection device of corresponding specifications.

[0035] In this way, the separation of long and short stems is achieved.

[0036] In the present application, the number of internal circulations mainly depends on the rotation speed of the screen roller 10 and the number of tobacco stems in the roller gap 11. The number of internal circulations should not be too small, otherwise it will affect the chance of "short stems choosing the fourth movement or the third movement"; the number of internal circulations should not be too many, otherwise it will affect the "discharging speed of long stems".

[0037] The contributions of this application are: First, this application uses the inner loop to increase the number of "short stems choose the fourth movement or the third movement" to facilitate the discharge of short stems; Secondly, when the short stem reaches the narrowest part of the roller gap 11, its movement direction changes from "downward" to "upward", and the short stem will have a brief "speed zero moment". At this moment, relying on gravity and the supporting force below, the posture of the short stem is adjusted to "the axial direction of the tobacco stem is forced to be consistent with the axial direction of the screen roller and the screen slot". In this way, the chance of "the short stem choosing the fourth movement or the third movement" is increased, which facilitates the discharge of the short stem.

[0038] In addition, in order to make the classification of the screened short stems (the meaning of short stems: tobacco stems with length ≤ N) clearer, for example, they are divided into first-level short stems (short stem length ≤ a), second-level short stems (a<short stem length ≤ b), and third-level short stems (b<short stem length ≤ N) according to their length. Of course, they can be divided more finely. This instruction manual takes the three-level division as an example.

[0039] The above-mentioned tobacco stem long and short stem separation device can only screen short stems of a single length specification, so further improvements are made as follows: A combination of tobacco stem long and short stem separation devices comprises a plurality of the above-mentioned tobacco stem long and short stem separation devices arranged in parallel, wherein the screen rollers 10 of the above-mentioned tobacco stem long and short stem separation devices are all on the same plane, and the gap between two adjacent tobacco stem long and short stem separation devices is also a roller gap 11.

[0040] Calculated from the upstream material direction, the length of the screen groove 21 of the screen roller 10 of the first tobacco stem long and short stem separation device is a, the length of the screen groove 21 of the screen roller 10 of the second tobacco stem long and short stem separation device is b, and the length of the screen groove 21 of the screen roller 10 of the third tobacco stem long and short stem separation device is N.

[0041] In this way, the long stems leave from the most downstream side of the third (most downstream) tobacco stem long and short stem separation device and enter the long stem collection device. The first-level short stems are separated from the bottom of the first tobacco stem long and short stem separation device, the second-level short stems are separated from the bottom of the second tobacco stem long and short stem separation device, and the third-level short stems are separated from the bottom of the third tobacco stem long and short stem separation device, thereby achieving accurate screening of short stems according to length specifications.

[0042] For other details, please refer to the prior art and will not be described in detail.

[0043] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A device for separating long and short tobacco stems, comprising a plurality of parallel screening rollers (10), characterized in that: The sieve rollers (10) rotate in the same direction, and the gap between any two adjacent sieve rollers (10) is a roller gap (11), and the narrowest part of the roller gap (11) is smaller than the diameter of the tobacco stem.

2. The device for separating long and short tobacco stems according to claim 1, characterized in that: A plurality of sieve grooves (21) are distributed on the outer surface of the sieve roller (10); the sieve grooves (21) are strip-shaped, and their axial directions are parallel to the axial direction of the sieve roller (10).

3. The device for separating long and short tobacco stems according to claim 1, characterized in that: The depth and width of the sieve slot (21) are equivalent to the diameter of the tobacco stem, so that one sieve slot (21) can only accommodate one short stem.

4. The device for separating long and short tobacco stems according to claim 1, characterized in that: A plurality of sieve grooves (21) form a sieve groove ring (20), and the sieve groove ring (20) is evenly distributed on the outer surface of the sieve roller (10).

5. The device for separating long and short tobacco stems according to claim 1, characterized in that: All the screen rollers (10) are distributed on a spatial plane, and the narrowest points of all the roller gaps (11) are also on the spatial plane.

6. The device for separating long and short tobacco stems according to claim 1, characterized in that: A roller (40) is provided between any two adjacent sieve rollers (10), and a gap between the sieve roller (10) and the roller (40) is also a roller gap (11).

7. The device for separating long and short tobacco stems according to claim 1, characterized in that: Four screen rollers (10) are provided.

8. A device assembly for separating long and short tobacco stems, characterized in that: The invention comprises three tobacco stem long and short stem separation devices arranged in parallel as claimed in claim 1, wherein the screen rollers (10) of the above-mentioned tobacco stem long and short stem separation devices are all on the same plane, and the gap between two adjacent tobacco stem long and short stem separation devices is also the roller gap (11). Calculated from the upstream material supply direction, the length of the screen groove (21) of the screen roller (10) of the first tobacco stem long and short stem separation device is a, the length of the screen groove (21) of the screen roller (10) of the second tobacco stem long and short stem separation device is b, and the length of the screen groove (21) of the screen roller (10) of the third tobacco stem long and short stem separation device is N.

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