CN-121988521-A - Screen barrel and tobacco stem screening device

CN121988521ACN 121988521 ACN121988521 ACN 121988521ACN-121988521-A

Abstract

The invention relates to the technical field of tobacco processing, and particularly discloses a screen cylinder and a tobacco stem screening device. The screen cylinder comprises a plurality of screen units connected end to end, wherein each screen unit comprises a plurality of roller frames, all the roller frames are circumferentially and uniformly distributed around the axis of the screen unit, all the screen units are divided into a first area, a second area and a third area which are sequentially connected, a first screen plate which is penetrated by a first long hole and a second long hole is embedded in each roller frame on the screen unit in the first area, a second screen plate which is penetrated by a third long hole and a third screen plate which is penetrated by a fourth long hole are respectively embedded in two adjacent roller frames on the screen unit in the second area, a fourth screen plate which is penetrated by a fifth long hole and a fifth screen plate which is penetrated by a sixth long hole are respectively embedded in two adjacent roller frames on the screen unit in the third area, and the long holes on the screen plate in the later area cover corresponding holes of the previous area in section projection. The screen cylinder is used for screening, so that the recovery rate and the screening purity of the long stems are improved.

Inventors

LEI YINGBO
GUO YUFENG
CAI YOUDONG
Jin Weisi
XU FEI
ZHANG HONGBO
BAI XUEFEI
YANG ZHENGTANG

Assignees

红云红河烟草(集团)有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260302

Claims (10)

1. The screen cylinder is characterized by comprising a plurality of screen units which are connected end to end, wherein the screen units extend along a working direction (X), the screen units comprise a plurality of roller frames (301) which extend along the working direction (X), all the roller frames (301) are circumferentially and uniformly distributed around the axis of the screen units, the side parts of two adjacent roller frames (301) are fixedly connected, all the screen units are divided into a first area, a second area and a third area which are sequentially connected, the screen units in the first area are defined as a first screen unit (310), the roller frames (301) on the first screen unit (310) are embedded with a first screen plate (311), the first screen plate (311) is penetrated with a plurality of first long holes (312) which extend along the working direction (X) and a plurality of second long holes (313) which extend perpendicular to the working direction (X), the screen units in the second area are defined as a second screen unit (320), the second screen units (321) are embedded with a plurality of second long holes (313) which extend along the working direction (X), the second screen plate (321) is embedded with a plurality of second long holes (323) which extend along the working direction (323), the third screen plate (322) is penetrated by a plurality of fourth long holes (324) extending perpendicular to the working direction (X), the cross-section projection of the fourth long holes (324) covers the cross-section projection of the second long holes (313), the screen units in the third area are defined as third screen units (330), a fourth screen plate (331) and a fifth screen plate (332) are respectively embedded in two adjacent roller frames (301) on the third screen units (330), the fourth screen plate (331) is penetrated by a plurality of fifth long holes (333) extending along the working direction (X), the cross-section projection of the fifth screen plate (333) covers the cross-section projection of the third long holes (323), and the cross-section projection of the sixth long holes (334) is penetrated by a plurality of sixth long holes (334) extending perpendicular to the working direction (X).
2. A screen cylinder according to claim 1, wherein the first screen plate (311) is provided with a plurality of screen mesh groups arranged in a matrix, the screen mesh groups comprising one second elongated hole (313) and a plurality of first elongated holes (312) arranged side by side, all the first elongated holes (312) in the screen mesh groups being located on the same side of the corresponding second elongated holes (313).
3. The screen cylinder according to claim 1, wherein all the third elongated holes (323) on the second screen plate (321) are arranged in a matrix and/or, All the fourth elongated holes (324) on the third screen plate (322) are arranged in a matrix.
4. The screen cylinder according to claim 1, wherein all the fifth elongated holes (333) of the fourth screening deck (331) are evenly distributed in a direction perpendicular to the working direction (X), and/or, All the sixth elongated holes (334) on the fifth screen plate (332) are uniformly distributed along the working direction (X).
5. The screen cylinder according to claim 4, wherein the fourth screen plate (331) comprises a first square frame (335) and a plurality of first screen bars (336) extending along the working direction (X), all the first screen bars (336) are uniformly distributed along a direction perpendicular to the working direction (X), the first screen bars (336) and the first square frame (335) enclose the fifth elongated hole (333), both ends of the first screen bars (336) are fixedly connected to the inner wall of the first square frame (335), and/or, The fifth sieve plate (332) comprises a second square frame (337) and a plurality of second sieve bars (338) which are perpendicular to the working direction (X), all the second sieve bars (338) are uniformly distributed along the working direction (X), the second sieve bars (338) and the second square frame (337) enclose a sixth long hole (334), and two ends of each second sieve bar (338) are fixedly connected to the inner wall of each second square frame (337).
6. The screen cylinder of claim 5, wherein the first screen bar (336) and the second screen bar (338) are each round steel.
7. A screen cylinder according to any one of claims 1-6, wherein the screen unit further comprises a ring-shaped raceway (302), the thickness direction of the raceway (302) is parallel to the length direction of the roller frame (301), the inner ring of the raceway (302) is sleeved on all the roller frames (301), and the outer ring of the raceway (302) is slidingly connected with the outside.
8. Tobacco stalk screening device for screening material, characterized in that, tobacco stalk screening device includes frame (200), feed screen (100) and the screen cloth section of thick bamboo of any one of claims 1-7, screen cloth section of thick bamboo swing joint in frame (200), just screen cloth section of thick bamboo can rotate around self axis relative frame (200), screen cloth section of thick bamboo is close to the one end of first district is defined as the input, screen cloth section of thick bamboo is close to the one end of third district is defined as the output, the axis of screen cloth section of thick bamboo is the contained angle with horizontal plane, the input is higher than the output sets up, feed screen (100) are used for guiding the material gets into the input.
9. The tobacco stem screening device according to claim 8, further comprising a hopper assembly (600) provided below the screen drum, the hopper assembly (600) comprising a crushed stem hopper (610), a cut stem hopper (620), a long stem hopper (630) and a stem crutch hopper (640), the crushed stem hopper (610) being used for collecting the material passing through the first screen panel (311), the cut stem hopper (620) being used for collecting the material passing through the second screen panel (321) or third screen panel (322), the long stem hopper (630) being used for collecting the material passing through the fourth screen panel (331) or fifth screen panel (332), the stem crutch hopper (640) being used for collecting the material discharged from the input end.
10. The tobacco stem screening device according to claim 8, wherein the frame (200) comprises a frame body (210) and a plurality of driving groups arranged on the frame body (210), the driving groups comprise a driving unit (240) and supporting rollers (220), an output end of the driving unit (240) is coaxially fixedly connected with the supporting rollers (220), and the supporting rollers (220) are used for driving the screen cylinder to rotate.

Description

Screen barrel and tobacco stem screening device Technical Field The invention relates to the technical field of tobacco processing, in particular to a screen cylinder and a tobacco stem screening device. Background With the rapid development of novel tobacco products, tobacco stems are used as important raw materials, the application of the tobacco stems is increasingly wide, and the demand is continuously increased. The tobacco stems are screened according to the specifications of length and the like to meet the requirements of different downstream processes, namely, long stems with the length of more than 20mm are mainly used for preparing cut stems, the quality of the cut stems directly influences the stability of cigarette products, the short stems can be used for sheet processing or active ingredient extraction, and crushed stems, stem turns and the like have no recycling value basically and are usually treated as waste. Therefore, the precision and efficiency of the screening link become key to influence the comprehensive utilization value of the tobacco stems. In the traditional tobacco stem treatment process, a plane screen device is mostly adopted for screening. However, as the tobacco stalk mixture after threshing and wind separation has complex components including long stalk, short stalk, crushed stalk, tobacco powder and the like, the materials are easy to be alternately wound and mutually entrained. The planar screen is easy to block screen holes during operation, and has limited material posture adjustment capability, so that screening precision is insufficient, on one hand, a large number of available long stems are mistakenly fed into crushed stems or stems to be removed, so that the recovery rate of the long stems is low, and on the other hand, more stems are mixed in the long stems, so that the quality of cut stems in the subsequent cut tobacco making process is fluctuated, and the quality of cigarette products is influenced. In addition, the requirements of the existing technology on screening efficiency are increased increasingly, strict indexes that the long stalk rate is more than or equal to 85.0% and the broken stalk rate is less than or equal to 5.0% are required to be met, and the planar screen is difficult to adapt to the requirements. Aiming at the problems, attempts have been made in the industry to adopt a roller type screening device, roll and disperse materials through the rotation of a cylinder body, and set different screening sections in the axial direction for classified screening. However, the common drum screen still has the problems of single screening track, insufficient material posture adjustment, lack of systematic cooperation of the arrangement of the screen holes of each section and the like, so that the screening accuracy and purity are still not ideal, and particularly the separation effect on stems and stems with similar lengths is limited. Disclosure of Invention The invention aims to provide a screen cylinder and a tobacco stem screening device, which are used for gradually and accurately screening, so that the recovery rate and the screening purity of long stems are improved. To achieve the purpose, the invention adopts the following technical scheme: The screen cylinder comprises a plurality of screen units connected end to end, wherein the screen units extend along the working direction, the screen units comprise a plurality of roller frames extending along the working direction, all the roller frames are circumferentially and uniformly distributed around the axis of the screen units, the side parts of two adjacent roller frames are fixedly connected, all the screen units are divided into a first area, a second area and a third area which are sequentially connected, the screen units in the first area are defined as first screen units, the roller frames on the first screen units are embedded with first screen plates, the first screen plates are penetrated with a plurality of first long holes extending along the working direction and a plurality of second long holes extending perpendicular to the working direction, the screen units in the second area are defined as second screen units, the two adjacent roller frames on the second screen units are respectively embedded with second screen plates and third screen plates, the second screen units penetrate through the third screen units and the third screen units, the second screen units penetrate the third screen units and the fourth screen units, the second screen units penetrate the third screen units and the third screen units, the second screen units and the third screen units are covered with the second screen frames, the second screen units and the second screen units are covered with the second screen units, the second screen units and the second screen units are covered with the screen units, the screen units and the screen units are covered with the screen units and the screen units are covered with t