Tobacco powder collecting device for tobacco rolling wheel of cigarette making machine

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By installing a collection device with tobacco dust blocking and suction functions on the cigarette rolling wheel, the problem of ineffective collection of tobacco dust during the rolling process is solved, and effective blocking and suction of tobacco dust are achieved, thereby improving the quality of cigarette products.

CN223403261UActive Publication Date: 2025-10-03CHINA TOBACCO HUNAN IND CORP

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Patent Information

Application Number: CN202422654359.2
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-10-31
Publication Date: 2025-10-03
Estimated Expiration: 2034-10-31

AI Technical Summary

Technical Problem

In the prior art, the tobacco dust generated by the cigarette wheel during the cigarette-tipping process cannot be effectively blocked and sucked away, resulting in quality defects such as tipping paper dust and mouth wrinkles, affecting the quality of cigarette products.

Method used

A cigarette dust collection device with cigarette dust blocking and suction functions is designed. The device is installed close to the lower side of the drum wheel and the upper side of the rubbing board, and is connected to the spare suction hole. The device includes a collection cavity and a mounting bracket. A cigarette dust suction hole is arranged inside the collection cavity. The cigarette dust is blocked by centrifugal force and the spare suction hole is used to suck the cigarette dust.

Benefits of technology

It effectively blocks and absorbs tobacco dust, reduces tipping paper dust and mouth wrinkle defects, and improves the quality of cigarette products.

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Abstract

The utility model discloses a cigarette making machine cigarette rubbing wheel tobacco powder collecting device which is installed on the lower side of an approaching drum wheel and the upper side of a rubbing plate and communicated with a standby air suction hole, the tobacco powder collecting device comprises a collecting cavity and an installing support, a cavity used for containing tobacco powder is formed in the collecting cavity, the cavity is communicated with the standby air suction hole, and the installing support is arranged in the collecting cavity. A tobacco powder suction hole is formed in one side, close to the closing drum wheel, of the collecting cavity; the collecting cavity is detachably installed on the installation support, and the installation support is installed on a cigarette making machine body so as to support the collecting cavity. According to the arrangement, the tobacco powder can be blocked by the baffle of the collecting cavity in the falling process under the action of centrifugal force, so that the tobacco powder can fall on the collecting cavity instead of a washboard, further, due to the fact that the tobacco powder suction holes are formed in the upper side of the left end of the collecting cavity, the tobacco powder can be sucked into the collecting cavity under the action of air suction, and the tobacco powder is prevented from falling off. Therefore, the tobacco powder is prevented from falling into the washboard to influence the quality of cigarette finished products.

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Description

Technical Field

[0001] The utility model relates to the technical field of tobacco leaf manufacturing, in particular to a tobacco dust collecting device on a cigarette rolling wheel of a cigarette making machine. Background Art

[0002] like Figure 1 As shown, the rolling wheel 2 is a crucial component of the ZJ118 filter rod tipping machine. Its function is to splice the "group cigarettes" delivered by the approach drum 1 under the action of the washboard 3. Before the "group cigarettes" are spliced, the counterclockwise rotation of the approach drum 1 and the clockwise rotation of the rolling wheel 2 produce a large amount of tobacco dust. Under the influence of centrifugal force, this tobacco dust adheres to the glued tipping paper or falls between the rolling wheel 2 and the washboard 3. Furthermore, this tobacco dust cannot be removed by the auxiliary suction holes 4. As the "group cigarette" rolls between the rolling wheel and the washboard, tobacco dust is trapped in them, resulting in tobacco dust trapped in the tipping paper and resulting in wrinkled cigarettes.

[0003] Therefore, how to provide a cigarette wheel cigarette dust collection device with cigarette dust blocking and suction functions to block the cigarette dust before the "group cigarette" is twisted and suck away the cigarette dust in time is a technical problem that technicians in this field currently need to solve. Utility Model Content

[0004] The utility model aims to provide a cigarette wheel cigarette dust collection device with the functions of blocking and sucking cigarette dust, which blocks the cigarette dust before the "group cigarette" is spliced and sucks away the cigarette dust in time, thereby achieving the goal of reducing the quality defects of cigarette paper clamping and mouth wrinkles, and improving the quality of cigarette products.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A cigarette dust collecting device for a cigarette rolling wheel of a cigarette making machine is installed close to the lower side of the drum wheel and the upper side of the washing plate, and is connected to the spare suction hole, comprising:

[0007] A collection cavity is provided with a cavity for accommodating cigarette dust, and the cavity is connected to the spare air suction hole. A cigarette dust suction hole is provided on the side of the collection cavity close to the drum wheel;

[0008] The collection chamber is detachably mounted on a mounting bracket, which is mounted on the cigarette making machine body to support the collection chamber. Preferably, the collection chamber includes a first end and a second end, the first end being adjacent to the cigarette rolling wheel, the cigarette end suction hole being located on the upper side of the first end, the mounting bracket being located to one side of the second end, and the thickness of the collection chamber gradually decreasing in a direction away from the mounting bracket.

[0009] Preferably, a suction regulating cover is movably provided on the upper side of the collecting cavity, and the suction regulating cover is moved to cover the smoke suction holes of different areas to adjust the suction force.

[0010] Preferably, a smoke baffle is detachably mounted on the lower side of the first end of the collecting chamber, and the smoke baffle extends toward the cigarette rubbing wheel.

[0011] Preferably, waist-shaped grooves are provided on both sides of the air suction regulating cover plate, and a first fastening screw is provided at a corresponding position on the upper side of the collecting cavity, and the fastening screw passes through the waist-shaped groove to fix the air suction regulating cover plate;

[0012] The smoke baffle is mounted to the collection chamber via a second fastening screw.

[0013] Preferably, the smoke suction hole is a mesh structure, and the mesh holes are square through holes of 4 mm×4 mm.

[0014] Preferably, the mounting bracket includes a mounting tube and a first mounting portion and a second mounting portion arranged at both ends of the mounting tube, the first mounting portion is a boss-like structure, and a plurality of mounting holes are evenly arranged on the first mounting portion, and the mounting bracket is installed to the cigarette making machine through the mounting holes.

[0015] Preferably, the mounting hole is a waist-shaped hole to adjust the mounting angle of the collection cavity.

[0016] Preferably, an output sleeve is provided on one side of the collecting cavity, and the output sleeve can be inserted into the mounting tube, and the diameter of the output sleeve matches the diameter of the mounting tube.

[0017] Preferably, the second mounting portion is a cylindrical structure with a slot provided on its circumference, and a limiting latch engaged with the slot is provided on the circumference of the output sleeve.

[0018] Compared with the above-mentioned background technology, the utility model provides a cigarette dust collection device for the cigarette rubbing wheel of a cigarette making machine, which is installed on the lower side of the drum wheel and the upper side of the rubbing board, and is connected to the spare suction hole, including: a collection cavity and a mounting bracket, a cavity for accommodating cigarette dust is provided inside the collection cavity, and the cavity is connected to the spare suction hole, and a cigarette dust suction hole is provided on the side of the collection cavity close to the drum wheel; the collection cavity is detachably mounted on the mounting bracket, and the mounting bracket is mounted on the cigarette making machine body to support the collection cavity.

[0019] Specifically, the cigarette dust collection device provided in the present application is installed on the cigarette making machine through a mounting bracket, and the interior of the collection chamber is connected to the spare suction hole. The installation position of the collection chamber is located on the lower side close to the drum wheel and on the upper side of the washboard, and its left end is close to the cigarette rolling wheel. In this way, under the action of centrifugal force, the cigarette dust will be blocked by the collection chamber during the falling process, so the cigarette dust will fall on the collection chamber instead of the washboard. Furthermore, since a cigarette dust suction hole is provided on the upper side of the left end of the collection chamber, under the action of the spare suction hole, the cigarette dust will be sucked into the collection chamber. In this way, the cigarette dust is prevented from falling into the washboard and affecting the quality of the finished cigarette. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the structure of a cigarette making machine in the prior art;

[0022] Figure 2 A schematic diagram of the installation of a smoke dust collecting device provided in an embodiment of the present utility model;

[0023] Figure 3 A schematic structural diagram of a smoke dust collecting device provided in an embodiment of the present utility model;

[0024] Figure 4 for Figure 3 Structural diagram from another angle;

[0025] Figure 5 A schematic diagram of the collection chamber structure provided by an embodiment of the present utility model;

[0026] Figure 6 for Figure 5 Structural diagram from another angle;

[0027] Figure 7 This is a schematic diagram of the mounting bracket structure provided by an embodiment of the present utility model.

[0028] in:

[0029] 1-close to the drum wheel, 2-smoke rubbing wheel, 3-washing board, 4-spare suction hole;

[0030] 100 - collection chamber, 110 - smoke suction hole, 120 - first end, 130 - second end, 140 - output sleeve, 150 - limit pin;

[0031] 200-mounting bracket, 210-mounting cylinder, 220-first mounting portion, 221-mounting hole, 230-second mounting portion, 231-slot;

[0032] 300-air suction adjustment cover, 310-first fastening screw;

[0033] 400-smoke baffle, 410-second fastening screw. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0036] In the description of the present invention, it should be understood that the terms "up", "down", "left" and "right" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the positions or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations of the present invention.

[0037] The utility model aims to provide a cigarette wheel cigarette dust collection device with cigarette dust blocking and suction functions, which blocks the cigarette dust before the "group cigarette" is spliced and sucks away the cigarette dust in time, thereby achieving the goal of reducing the quality defects of cigarette paper clamping and mouth wrinkles, and improving the quality of cigarette products.

[0038] To achieve the above objectives, the present invention provides the following technical solutions:

[0039] See Figures 2 to 7 , this embodiment provides a cigarette butt collection device for the cigarette-making machine's cigarette-rubbing wheel, which is installed on the lower side of the close-to-drum wheel 1 and the upper side of the rubbing board 3, and is connected to the spare suction hole 4, including: a collection chamber 100 and a mounting bracket 200, a cavity for accommodating cigarette butts is provided inside the collection chamber 100, and the cavity is connected to the spare suction hole 4, and a cigarette butt suction hole 110 is provided on the side of the collection chamber 100 close to the close-to-drum wheel 1; the mounting bracket 200 is detachably mounted on one side of the collection chamber 100, and the mounting bracket 200 is mounted on the cigarette-making machine to support the collection chamber 100.

[0040] Specifically, the cigarette dust collecting device provided in the present application is installed on the cigarette making machine through the mounting bracket 200, and the interior of the collecting chamber 100 is just connected to the spare air suction hole 4 of the cigarette making machine, so there is no need to open a new air suction port; the installation position of the collecting chamber 100 is located on the lower side close to the drum wheel 1 and on the upper side of the washing board 3, and its left end is close to the cigarette rolling wheel 2, specifically Figure 2 As shown, the angle between the collecting cavity 100 and the horizontal plane is about 45 degrees, and the end of the collecting cavity 100 close to the cigarette wheel 2 is higher, that is, the left end of the collecting cavity 100 is higher than the right end.

[0041] In this way, under the action of centrifugal force, the cigarette dust will be blocked by the collecting chamber 100 during the falling process, so the cigarette dust will fall on the collecting chamber 100 instead of the scrubbing board 3. Furthermore, since a cigarette dust suction hole 110 is provided on the upper left end of the collecting chamber 100, the cigarette dust will be sucked into the collecting chamber 100 under the action of the spare suction hole 4. In this way, the cigarette dust is prevented from falling into the scrubbing board 3 and affecting the quality of the finished cigarette.

[0042] In this embodiment, the collecting chamber 100 includes a first end 120 and a second end 130, the first end 120 is close to the cigarette-rolling wheel 2, and the smoke suction hole 110 is arranged on the upper side of the first end 120, and the mounting bracket 200 is arranged on one side of the second end 130, and the thickness of the collecting chamber 100 gradually decreases in the direction away from the mounting bracket 200.

[0043] Specific as Figure 4 and Figure 6 As shown, the collecting chamber 100 as a whole is a chamber with gradually increasing thickness from left to right, that is, the end close to the cigarette wheel 2 and the rubbing board 3 is smaller in thickness, which is the first end 120, and the end where the mounting bracket 200 is installed is larger in thickness, which is the second end 130; with such a configuration, firstly, since the volume of the cigarette dust is smaller and the space occupied is smaller, the thickness of the first end 120 for collecting the cigarette dust is smaller. After the cigarette dust is collected inside the collecting chamber 100, it will slide down to the second end 130 for temporary storage. Therefore, the second end 130 is set to be thicker, which reduces the weight of the collecting chamber 100, reduces the load of the mounting bracket 200, and can increase its service life; in addition, since the suction force required by the collecting device comes from the spare suction hole 4, the second end 130 connected to the collecting device needs to fit the size of the spare suction hole 4 to avoid waste of wind force. Therefore, the second end 130 of the collecting chamber 100 is set to be thicker.

[0044] In order to further optimize the suction pressure of the collection chamber 100, based on the above embodiment, a suction adjustment cover 300 is movably provided on the upper side of the collection chamber 100. The suction adjustment cover 300 adjusts the suction force by moving to block the smoke suction holes 110 of different areas.

[0045] Specific as Figure 2 As shown, a suction adjustment cover 300 is movably provided on the upper side of the collecting chamber 100, and the suction adjustment cover 300 can be moved along the upper side of the collecting chamber 100 close to the cigarette rubbing wheel 2 or away from the cigarette rubbing wheel 2. In this way, since the smoke suction hole 110 is provided on the upper side of the left end of the collecting chamber 100, when the suction adjustment cover 300 moves to the left, the smoke suction hole 110 will be blocked, thereby reducing the suction pressure. When the suction adjustment cover 300 moves to the right, the area in which the smoke suction hole 110 can play a role will be expanded, thereby increasing the suction pressure. In other words, this embodiment can conveniently adjust the suction pressure of the smoke collection device by adjusting the position of the suction adjustment cover 300 to the left or right.

[0046] In this embodiment, a smoke baffle 400 is detachably mounted on the lower side of the first end 120 of the collecting chamber 100 , and the smoke baffle 400 extends toward the cigarette rubbing wheel 2 .

[0047] It can be understood that in order to further increase the convenience and effectiveness of the use of the cigarette collection device, a cigarette baffle 400 that can be moved to the left is provided at the left end of the collection chamber 100. Preferably, in this embodiment, the distance between the left end of the cigarette baffle 400 and the cigarette receiving groove of the cigarette wheel 2 is the cigarette diameter + 15mm; with this arrangement, the cigarette baffle 400 can block heavier cigarettes, that is, heavier cigarettes are less affected by the centrifugal force and will not float obliquely backward. Therefore, the cigarette baffle 400 can just catch these heavier cigarettes, and the blocked cigarettes fall into the cigarette suction hole 110 through the baffle, and are then collected into the dust removal system through the collection chamber 100.

[0048] Preferably, waist-shaped grooves are provided on both sides of the suction adjustment cover 300, and a first fastening screw 310 is provided at the corresponding position on the upper side of the collection chamber 100. The fastening screw passes through the waist-shaped groove to fix the suction adjustment cover 300; the smoke baffle 400 is installed to the collection chamber 100 through the second fastening screw 410.

[0049] It can be understood that in order to facilitate the movement and fixation of the suction adjustment cover 300 and the smoke baffle 400, waist-shaped long grooves are provided on both sides of both. Correspondingly, the upper and lower positions of the left end of the collecting chamber 100 are provided with a first fastening screw 310 and a second fastening screw 410 that can be screwed. The first fastening screw 310 is passed through the waist-shaped groove of the suction adjustment cover 300, and the second fastening screw 410 is passed through the waist-shaped groove of the smoke baffle 400. When the position of the two needs to be adjusted, it is only necessary to loosen the first fastening screw 310 and the second fastening screw 410. After the position adjustment is completed, the two screws can be tightened.

[0050] In this embodiment, the smoke suction hole 110 is specifically a mesh structure, and the mesh holes are square through holes of 4 mm×4 mm.

[0051] Specifically, if Figure 3 and Figure 5 As shown, the smoke suction hole 110 has a mesh structure as a whole, and the mesh is preferably a 4mm×4mm square through hole according to actual needs. Of course, the laying shape and cross-sectional shape of the smoke suction hole 110 can be adjusted according to actual needs, and this article does not make specific limitations.

[0052] In this embodiment, the mounting bracket 200 includes a mounting tube 210 and a first mounting portion 220 and a second mounting portion 230 arranged at both ends of the mounting tube 210. The first mounting portion 220 is a boss-like structure, and a plurality of mounting holes 221 are evenly arranged on the first mounting portion 220. The mounting bracket 200 is installed to the cigarette making machine through the mounting holes 221.

[0053] Specific as Figure 6 As shown, the mounting bracket 200 is a stepped cylindrical structure as a whole, wherein the middle position is the mounting tube 210, and a boss is provided at one end of the mounting tube 210, namely the first mounting portion 220, and a plurality of mounting holes 221 are provided on the first mounting portion 220. The first mounting portion 220 is used to connect with the cigarette making machine, and is screwed to the cigarette making machine through the mounting bolts passing through the mounting holes 221 to complete the fixation of the mounting bracket 200.

[0054] Furthermore, the mounting hole 221 is specifically a waist-shaped hole to adjust the mounting angle of the collection chamber 100 .

[0055] In this embodiment, there are four mounting holes 221, all of which are waist-shaped holes. Figure 7 As shown, with such an arrangement, when the inclination angle of the collecting chamber 100 needs to be adjusted, it is only necessary to loosen the mounting screw to adjust it, and then tighten the mounting bolt again after adjustment. This not only increases the adjustment range of the installation angle, but also improves the convenience of adjusting the angle.

[0056] Furthermore, an output sleeve 140 is provided on one side of the collecting chamber 100 . The output sleeve 140 can be inserted into the mounting tube 210 , and the diameter of the output sleeve 140 matches the diameter of the mounting tube 210 .

[0057] The suction force of the collecting chamber 100 in this embodiment comes from the spare suction hole 4. Therefore, the inside of the collecting chamber 100 needs to be connected with the spare suction hole 4. Therefore, an output sleeve 140 is set on one side of the collecting chamber 100. The output sleeve 140 can be inserted into the mounting bracket 200 and connected with the spare suction hole 4 through the mounting tube 210 of the mounting bracket 200. This can improve the convenience of assembling the collecting chamber 100 and the mounting bracket 200. Of course, in order to avoid the leakage of wind pressure, the diameter of the output sleeve 140 just matches the diameter of the mounting tube 210, that is, the output sleeve can just be inserted into the mounting tube 210 and there will be no wind pressure leakage.

[0058] Furthermore, the second mounting portion 230 is a cylindrical structure, and a clamping groove 231 is provided on its circumference. A limiting clamping pin 150 engaged with the clamping groove 231 is provided on the circumference of the output sleeve 140 .

[0059] In order to enable the collecting chamber 100 to be easily connected to the mounting bracket 200, that is, the collecting chamber 100 can rotate with the rotation of the mounting bracket 200, and the two will not rotate relative to each other, in this embodiment, a limit pin 150 is provided on the output sleeve 140, and a card slot 231 is provided on the second mounting portion 230. When the output sleeve 140 of the collecting chamber 100 is inserted into the mounting tube 210, the limit pin 150 can be just locked in the card slot 231. In this way, the assembly of the collecting chamber 100 and the mounting bracket 200 can be completed quickly and conveniently.

[0060] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0061] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0062] The above is a detailed introduction to the embodiments provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. It should be noted that, for those skilled in the art, without departing from the principles of the present invention, various improvements and modifications may be made to the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A cigarette dust collecting device for a cigarette making machine, mounted on the lower side of a drum (1) and the upper side of a rubbing plate (3), and connected to a spare air suction hole (4), characterized in that: include: A collection cavity (100) is provided with a cavity for accommodating cigarette smoke, and the cavity is communicated with the spare air suction hole (4). A cigarette smoke suction hole (110) is provided on a side of the collection cavity (100) close to the drum wheel (1); The collecting chamber (100) is detachably mounted on a mounting bracket (200), and the mounting bracket (200) is mounted on a cigarette making machine body to support the collecting chamber (100).

2. The cigarette dust collecting device for a cigarette rolling wheel of a cigarette making machine according to claim 1, characterized in that: The collecting chamber (100) comprises a first end (120) and a second end (130), wherein the first end (120) is close to the cigarette rolling wheel (2), and the cigarette end suction hole (110) is arranged on the upper side of the first end (120), and the mounting bracket (200) is arranged on one side of the second end (130), and the thickness of the collecting chamber (100) gradually decreases in a direction away from the mounting bracket (200).

3. The cigarette dust collecting device for a cigarette rolling wheel of a cigarette making machine according to claim 2, characterized in that: An air suction regulating cover plate (300) is movably provided on the upper side of the collection cavity (100), and the air suction regulating cover plate (300) is adapted to adjust the suction force by moving to block the smoke suction holes (110) of different areas.

4. The cigarette dust collecting device for a cigarette rolling wheel of a cigarette making machine according to claim 3, characterized in that: A smoke baffle (400) is detachably mounted on the lower side of the first end (120) of the collecting chamber (100), and the smoke baffle (400) extends toward the cigarette rubbing wheel (2).

5. The cigarette dust collecting device for a cigarette-making machine cigarette wheel according to claim 4, characterized in that: Waist-shaped grooves are provided on both sides of the air suction regulating cover plate (300), and a first fastening screw (310) is provided at a corresponding position on the upper side of the collecting cavity (100), and the fastening screw passes through the waist-shaped grooves to fix the air suction regulating cover plate (300); The smoke baffle (400) is mounted to the collection chamber (100) via a second fastening screw (410).

6. The cigarette dust collecting device for a cigarette rolling wheel of a cigarette making machine according to claim 1, characterized in that: The cigarette dust suction hole (110) is specifically a mesh structure, and the mesh holes are 4mm×4mm square through holes.

7. The cigarette dust collecting device for a cigarette rolling wheel of a cigarette making machine according to claim 1, characterized in that: The mounting bracket (200) comprises a mounting tube (210) and a first mounting portion (220) and a second mounting portion (230) arranged at both ends of the mounting tube (210); the first mounting portion (220) is a boss-shaped structure; a plurality of mounting holes (221) are evenly arranged on the first mounting portion (220); the mounting bracket (200) is mounted to the cigarette making machine through the mounting holes (221).

8. The cigarette dust collecting device for a cigarette-making machine cigarette wheel according to claim 7, characterized in that: The mounting hole (221) is specifically a waist-shaped hole, so as to adjust the mounting angle of the collection cavity (100).

9. The cigarette dust collecting device for a cigarette-making machine cigarette wheel according to claim 7, characterized in that: An output sleeve (140) is provided on one side of the collecting cavity (100), and the output sleeve (140) can be inserted into the installation cylinder (210), and the diameter of the output sleeve (140) matches the diameter of the installation cylinder (210).

10. The cigarette dust collecting device for a cigarette rolling wheel of a cigarette making machine according to claim 9, characterized in that: The second mounting portion (230) is a cylindrical structure, and a clamping groove (231) is provided on its circumference. A limiting clamping pin (150) is provided on the circumference of the output sleeve (140) and is engaged with the clamping groove (231).