Coaxial Bidirectional Spiral Flow-Guiding Rolling Tobacco Stem Screening Device

Abstract

A coaxial bidirectional spiral flow guiding type rolling tobacco stem screening device, comprising two parallel fixed frames: a left fixed frame and a right fixed frame. A plurality of parallel screening rollers are arranged between the two fixed frames. The screening rollers are fixed outside the roller shafts. Both ends of the roller shafts are rotatably connected to the two fixed frames. One end of the roller shaft extends outwards to the outside of the fixed frame to form a screening roller power part. The screening roller power part is connected to a power source and is driven by the power source. The gap between two adjacent screening rollers is a screening hole, and the screening hole is used for fine stems to pass through. Compared with the prior art, the technical effect of the present invention is that the screening rollers are provided with spiral protrusions, and the spiral protrusions can comb the tobacco stems to make their axial directions parallel to the screening holes, so that more fine stems fall from the screening holes, and at the same time, the coarse stem materials are removed, and the screening effect is better.

Description

Technical Field

[0001] The present invention relates to the field of tobacco production machinery and equipment, and specifically to a coaxial bidirectional spiral flow guiding rolling tobacco stem screening device. Background Art

[0002] At present, there are many thick stems, stem bends and extremely thin stems in the incoming tobacco stems, which affect the processing quality of stem strips. In the existing tobacco stem screening devices, whether it is a flat vibrating screen or a drum rotating screen, when the tobacco stems vibrate or are conveyed on the screen, due to the large material flow rate, the sorting effect of the tobacco stems is often poor due to reasons such as the accumulation, clamping or insufficient and inaccurate screening of the conveyed tobacco stems, and it is difficult to obtain the tobacco stems with the quality required by the process requirements.

[0003] Therefore, in the process of cigarette production, the removal of thick stems, stem bends and extremely thin stems is of great significance. After the existing screen screening, there will still be some thick stems, stem bends and extremely thin stems in the high-value tobacco stems after screening, and the screening effect is poor, which cannot meet the quality requirements of tobacco stems used by cigarette industrial enterprises. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: how to design a tobacco stem screening device with better screening effect.

[0005] The technical solution of the present invention is specifically as follows:

[0006] A coaxial bidirectional spiral flow guiding rolling tobacco stem screening device includes two parallel fixed frames: a left fixed frame and a right fixed frame. A plurality of parallel screen rollers are arranged between the two fixed frames. The screen rollers are fixed outside the roller shafts. Both ends of the roller shafts are rotatably connected to the two fixed frames. One end of the roller shaft extends outward to the outside of the fixed frame to form a screen roller power part. The screen roller power part is connected to a power source and is driven by the power source. The gap between two adjacent screen rollers is a screen hole, and the screen hole is used for thin stems to pass through.

[0007] Spiral protrusions are fixed on the outer surface of the screen roller.

[0008] The screen roller is divided into a left end part, a right end part and a middle part. The left part of the screen roller is the left end part, the right part of the screen roller is the right end part, and the part between the left end part and the right end part is the middle part; the spiral direction of the spiral protrusions on the left end part is a positive spiral, and the meaning of the positive spiral is: the spiral protrusions gradually move forward along the rotation direction of the screen roller, and the distance from the left fixed frame is greater; the spiral direction of the spiral protrusions on the right end part is a reverse spiral, and the meaning of the reverse spiral is: the spiral protrusions gradually move forward along the rotation direction of the screen roller, and the distance from the right fixed frame is greater.

[0009] Multiple parallel screening rollers include multiple groups of A screening roller units and B screening roller units. Both the A screening roller units and the B screening roller units include at least one screening roller. The A screening roller units and the B screening roller units are staggered. The middle part of the screening roller of the A screening roller unit is a positive helix, and the middle part of the screening roller of the B screening roller unit is a reverse helix.

[0010] Either the A screening roller unit or the B screening roller unit includes three screening rollers, and the spiral protrusions at the left end and the right end are 2 - 3 turns.

[0011] The spiral protrusions at the left end and the middle part of the A screening roller unit are continuously distributed, and the spiral protrusions at the right end and the middle part of the B screening roller unit are continuously distributed.

[0012] A plurality of friction rings are arranged in parallel on the surface of the screening roller. One friction ring includes a plurality of strip-shaped grooves, and the plurality of strip-shaped grooves are annularly distributed on the outer surface of the screening roller. The strip-shaped grooves can increase the roughness of the screening roller and increase the friction coefficient.

[0013] The power part of the screening roller is fixed with a sprocket or a pulley.

[0014] Compared with the prior art, the technical effect of the present invention is that the screening roller is provided with spiral protrusions. The spiral protrusions can comb the tobacco stems so that their axial directions are parallel to the sieve holes, enabling more fine stems to fall through the sieve holes, and at the same time removing the thick stem materials, and the screening effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the present invention.

[0016] Figure 2 is a top view schematic diagram of a partial area of the present invention.

[0017] Figure 3 is a partial enlarged schematic diagram of the screening roller 20. DETAILED DESCRIPTION OF THE INVENTION

[0018] In this specification, the forward direction of the tobacco stem is the front, and the reverse direction is the back.

[0019] In this specification, the following explanations are given for four technical terms:

[0020] The meaning of thick stem: The leaf stem with a relatively large stem diameter that cannot pass through the sieve hole 39;

[0021] The meaning of fine stem: The leaf stem with a relatively small stem diameter that can pass through the sieve hole 39;

[0022] The meaning of extra-fine stem: The leaf stem with a particularly small stem diameter in the fine stems and not meeting the requirements of tobacco production;

[0023] The meaning of thick stem material: The mixture of thick stems and stem bends.

[0024] The present invention will be introduced in detail below in conjunction with the accompanying drawings and its specific embodiments.

[0025] As Figure 1-2 , a coaxial bidirectional spiral diversion type rolling tobacco stem screening device includes two parallel fixed frames: a left fixed frame 10 and a right fixed frame 11. A plurality of parallel screening rollers 20 are provided between the two fixed frames. The screening rollers 20 are fixed outside a roller shaft (not shown in the figure). Both ends of the roller shaft are rotatably connected to the two fixed frames. One end of the roller shaft extends outward to the outside of the fixed frame to form a screening roller power part 200. The screening roller power part 200 can be connected to a power source (such as a motor, etc.) through mechanisms such as transmission sprockets and is driven by the power source, so that the roller shaft and the screening rollers 20 can rotate.

[0026] The gap between two adjacent screening rollers 20 is a screening hole 39, and the screening hole 39 is used for fine stems to pass through.

[0027] In order to prevent the coarse stem material from settling in the screening hole 39 and blocking it, spiral protrusions 30 are fixed on the outer surface of the screening roller 20.

[0028] In order to prevent the coarse stem material from falling off from the gap between the end face of the screening roller 20 and the left fixed frame 10 and the right fixed frame 11 (because the fine stems will fall downward, and a fine stem collection device is provided below the screening roller 20. If the coarse stem material falls off from this gap, it will contaminate the fine stems), the screening roller 20 is divided into a left end part 201, a right end part 202, and an intermediate part 203. The left part of the screening roller 20 is the left end part 201, the right part of the screening roller 20 is the right end part 202, and the part between the left end part 201 and the right end part 202 is the intermediate part 203;

[0029] The spiral direction of the spiral protrusions 30 on the left end part 201 is a positive spiral 31. The meaning of the positive spiral 31 is that as the spiral protrusions 30 gradually move forward along the rotation direction of the screening roller 20, the distance to the left fixed frame 10 becomes larger;

[0030] The spiral direction of the spiral protrusions 30 on the right end part 202 is a reverse spiral 32. The meaning of the reverse spiral 32 is that as the spiral protrusions 30 gradually move forward along the rotation direction of the screening roller 20, the distance to the right fixed frame 11 becomes larger.

[0031] In this way, the coarse stem material is guided by the positive spiral 31 of the left end part 201 or the reverse spiral 32 of the right end part 202 and will gradually approach the intermediate part 203, reducing the probability of contaminating the fine stems.

[0032] In order to give the thin stems more opportunities to pass through the sieve holes 39, multiple parallel sieve rollers 20 include multiple groups of A sieve roller units 21 and B sieve roller units 22. Both the A sieve roller units 21 and B sieve roller units 22 include at least one sieve roller 20. The A sieve roller units 21 and B sieve roller units 22 are staggered. The middle part 203 of the sieve roller 20 in the A sieve roller unit 21 is a positive helix 31, and the middle part 203 of the sieve roller 20 in the B sieve roller unit 22 is a reverse helix 32. In this way, guided by the positive helix 31 and the reverse helix 32, the whole tobacco stem moves in an S shape on the sieve roller 20, extending the path of the tobacco stem and giving the thin stems more opportunities to adhere to the surface of the sieve roller 20. The thin stems adhering to the surface of the sieve roller 20 will probably pass through the sieve holes 39.

[0033] Through experiments, if the number of sieve rollers 20 included in the A sieve roller unit 21 or the B sieve roller unit 22 is too small, the S-shaped movement trajectory of the tobacco stem is not obvious enough, affecting the efficiency; if the number of sieve rollers 20 included in the A sieve roller unit 21 or the B sieve roller unit 22 is too large, the tobacco stems will accumulate in the left end part 201 and the right end part 202 areas and become thicker, which will also affect the efficiency. The best is that the A sieve roller unit 21 or the B sieve roller unit 22 includes three sieve rollers 20, and the spiral protrusions 30 at the left end part 201 and the right end part 202 are 2 - 3 turns.

[0034] For the convenience of manufacturing, the spiral protrusions 30 at the left end part 201 and the middle part 203 of the A sieve roller unit 21 are continuously distributed, and the spiral protrusions 30 at the right end part 202 and the middle part 203 of the B sieve roller unit 22 are continuously distributed.

[0035] As Figure 3 , in order to increase the static friction between the sieve roller 20 and the tobacco stem (and also to prevent the tobacco stem from slipping), multiple parallel friction rings are provided on the surface of the sieve roller 20. One friction ring includes multiple strip-shaped grooves 40, and the multiple strip-shaped grooves 40 are annularly distributed on the outer surface of the sieve roller 20. The strip-shaped grooves 40 can increase the roughness of the sieve roller 20 and increase the friction coefficient.

[0036] The sieve roller power part 200 can be fixed with a sprocket or a pulley for convenient connection with the motor.

[0037] Its working principle is as follows:

[0038] When in use, when the tobacco stems are placed at the starting end of this patent ( Figure 1 the right end in Figure 1 ), the sieve roller 20 moves along the "forward direction on the upper surface", referring to the arrow b in Figure 1 , the whole tobacco stem moves to the left, referring to the arrow a in Figure 1 , the thin stems fall through the sieve holes 39, referring to the arrow d in Figure 1 , and then are collected. The thick stem materials keep moving to the end of this patent ( Figure 1The arrow c, and then they are automatically summarized together and enter the next production process.

[0039] In this way, the thin stems (high-value raw materials for making tobacco) and the thick stem materials (scrapped raw materials or low-value raw materials for making tobacco) are separated by this patent.

[0040] Specifically for the size adjustment of the thin stems, it can be achieved by adjusting the width of the sieve holes 39.

[0041] The extra-thin stems contained in the thin stems can be removed by secondary screening of the thin stems and then removing the extra-thin stems. For example, this patent can be used, but the high-value raw materials flow out from arrow c, and the extra-thin stems flow out from arrow d, which will not be elaborated here.

[0042] The features of this patent:

[0043] S1. The raw materials (tobacco stems) before separation and the raw materials (thick stem materials) after separation are located at two positions of this patent respectively, and both can be input or output centrally, which is convenient for docking with the assembly line and meets the needs of modern production.

[0044] S2. The spiral protrusions 30 can continuously switch the axial direction of the tobacco stems. For specific thin stems, as a whole, there is a chance to fall through within the sieve holes 39 to complete the screening. Therefore, it gives the thin stems more chances to pass through the sieve holes 39; for the thick stem materials, it can prevent them from stagnating in a certain sieve hole 39 to form a blockage.

[0045] S3. The spiral protrusions 30 can disperse the tobacco stems, making the distribution area larger and more uniform, and avoiding the accumulation of raw materials. Therefore, the spiral protrusions can also function as a distributor.

[0046] S4. The thick stem materials are guided by the positive spiral 31 at the left end 201 or the reverse spiral 32 at the right end 202, and will gradually approach the middle part 203, reducing the probability of the thick stems falling off from the gap between the end face of the sieve roller 20 and the left fixing frame 10 and the right fixing frame 11 and contaminating the thin stems.

[0047] For other content, please refer to the prior art.

[0048] The above are only the preferred embodiments of the present invention. It should be noted that for those skilled in the art, without departing from the overall concept of the present invention, several changes and improvements can still be made, and these should also be regarded as the protection scope of the present invention.

Claims

1. A coaxial bidirectional spiral flow guiding type rolling tobacco stem screening device, comprising two parallel fixed frames: a left fixed frame (10) and a right fixed frame (11), characterized in that: A plurality of parallel screening rollers (20) are provided between two fixing frames. The screening rollers (20) are fixed outside the roller shafts. Both ends of the roller shafts are rotatably connected to the two fixing frames. One end of the roller shaft extends outward to the outside of the fixing frame to form a screening roller power part (200). The screening roller power part (200) is connected to a power source and is driven by the power source. The gap between two adjacent screening rollers (20) is a screening hole (39), and the screening hole (39) is used for the thin stalks to pass through; Spiral protrusions (30) are fixed on the outer surface of the screening roller (20); The plurality of parallel screening rollers (20) include multiple groups of A screening roller units (21) and B screening roller units (22). Both the A screening roller units (21) and the B screening roller units (22) include at least one screening roller (20). The A screening roller units (21) and the B screening roller units (22) are staggered. The middle part (203) of the screening roller (20) in the A screening roller unit (21) is a positive helix (31), and the middle part (203) of the screening roller (20) in the B screening roller unit (22) is a reverse helix (32); The A screening roller unit (21) or the B screening roller unit (22) includes three screening rollers (20); The screening roller (20) is divided into a left end part (201), a right end part (202), and a middle part (203). The left side part of the screening roller (20) is the left end part (201), the right side part of the screening roller (20) is the right end part (202), and the part between the left end part (201) and the right end part (202) is the middle part (203); The spiral direction of the spiral protrusion (30) on the left end part (201) is a positive helix (31). The meaning of the positive helix (31) is that the spiral protrusion (30) gradually moves forward along the rotation direction of the screening roller (20), and the distance to the left fixing frame (10) is larger; The spiral direction of the spiral protrusion (30) on the right end part (202) is a reverse helix (32). The meaning of the reverse helix (32) is that the spiral protrusion (30) gradually moves forward along the rotation direction of the screening roller (20), and the distance to the right fixing frame (11) is larger.

2. The coaxial bidirectional spiral flow guiding type rolling tobacco stem screening device according to claim 1, wherein: The spiral protrusions (30) of the left end part (201) and the middle part (203) of the A screening roller unit (21) are continuously distributed, and the spiral protrusions (30) of the right end part (202) and the middle part (203) of the B screening roller unit (22) are continuously distributed.

3. The coaxial bidirectional spiral flow guiding type rolling tobacco stem screening device according to claim 2, characterized in that: A plurality of parallel friction rings are provided on the surface of the screening roller (20). One friction ring includes a plurality of strip-shaped grooves (40). The plurality of strip-shaped grooves (40) are annularly distributed on the outer surface of the screening roller (20). The strip-shaped grooves (40) can increase the roughness of the screening roller (20) and increase the friction coefficient.

4. The coaxial two-way spiral flow guiding type rolling tobacco stem screening device according to claim 3, wherein: The screening roller power part (200) is fixed with a sprocket or a pulley.

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