Sealing assembly for cigarette stirring device

Abstract

The utility model provides a sealing assembly for a cigarette stirring device. The sealing assembly comprises a first rigid sealing sleeve and a second rigid sealing sleeve. The first rigid sealing sleeve is fixed to the transmission box in a sealed mode, and the front end of the first rigid sealing sleeve abuts against the bearing outer ring of the rear bearing. The second rigid sealing sleeve is fixed to the stirring roller in a sealed mode, and the two ends of the second rigid sealing sleeve abut against a bearing inner ring of the rear bearing and a shaft shoulder of the stirring roller respectively. The second rigid sealing sleeve and the first rigid sealing sleeve can rotate relatively, and a labyrinth sealing structure is formed between the second rigid sealing sleeve and the first rigid sealing sleeve. Due to the fact that the first rigid sealing sleeve and the second rigid sealing sleeve are in interference fit with the transmission box and the stirring roller respectively and can rotate relative to each other in a non-contact state, resistance of the sealing assembly to the stirring roller is effectively reduced, and the driving assembly is prevented from bearing large loads. In addition, the sealing assembly is not prone to aging, and the service life is longer.

Description

Technical Field

[0001] The utility model belongs to the technical field of cigarette stirring and sealing, and in particular relates to a sealing component for a cigarette stirring device. Background Art

[0002] Existing tobacco packaging machines are all equipped with a cigarette stirring device, which uses the stirring roller of the cigarette stirring device to stir the cigarettes so that adjacent cigarettes can enter the cigarette lowering channel one by one, avoiding multiple cigarettes crowding at the entrance of the cigarette lowering channel and causing cigarette lowering blockage.

[0003] The structure of the existing cigarette stirring device can be found in the utility model patent with application number 201420556762.5. From the attached drawings of the patent, it can be seen that the cigarette stirring device includes a plurality of stirring rollers arranged at intervals along the left and right directions. The front end of each stirring roller extends into the transmission box and is rotatably mounted on the transmission box through the front bearing and the rear bearing; the transmission box is provided with gears fixed coaxially with each stirring roller and racks meshing with each gear at the same time; the driving assembly drives the rack to reciprocate to drive each gear to rotate, so as to realize the rotation of each stirring roller. In actual use, it is found that when the gear and the rack are matched, the tooth surface will heat up due to friction, thereby affecting the service life of the gear and the rack. In order to reduce the tooth surface friction and the heat generated by the tooth surface friction when the gear and rack are matched, the user will inject a certain amount of lubricating oil into the transmission box. The skeleton oil seal set between the traditional stirring roller and the transmission box is interference fit on the stirring roller through the rubber sealing lip; when the stirring roller rotates relative to the skeleton oil seal, the rubber sealing lip of the skeleton oil seal is very likely to fail due to wear and aging, resulting in more lubricating oil in the transmission box leaking out and contaminating the cigarettes; in addition, the stirring roller will be subject to resistance from the skeleton oil seal when rotating, and this resistance will increase the load of the drive component and cause unnecessary energy waste. Utility Model Content

[0004] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a sealing assembly for a cigarette stirring device, which forms a labyrinth sealing structure by combining two rigid sealing sleeves, which not only effectively reduces the resistance of the sealing assembly to the stirring roller, but also greatly improves the service life of the sealing assembly.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a sealing assembly for a cigarette stirring device, the cigarette stirring device comprising a transmission box, a rack slidably arranged in the transmission box along the left-right direction, a plurality of gears located in the transmission box and meshing with the rack, a stirring roller coaxially fixed on each gear and a driving assembly for driving the rack to move; the stirring roller is rotatably mounted on the transmission box through a front bearing and a rear bearing, and the rear end of the stirring roller extends out of the transmission box; the sealing assembly is arranged between the transmission box and the stirring roller, and the sealing assembly is located at the rear end of the rear bearing; the sealing assembly comprises a first rigid sealing sleeve and a second rigid sealing sleeve; the first rigid sealing sleeve seals The first rigid sealing sleeve is sealed and fixed on the transmission case, and the front end of the first rigid sealing sleeve abuts against the outer ring of the rear bearing; the second rigid sealing sleeve is sealed and fixed on the stirring roller, and the two ends of the second rigid sealing sleeve abut against the inner ring of the rear bearing and the shoulder of the stirring roller respectively; the second rigid sealing sleeve and the first rigid sealing sleeve can rotate relative to each other and form a labyrinth sealing structure therebetween; since the first rigid sealing sleeve and the second rigid sealing sleeve are respectively interference fit on the transmission case and the stirring roller, and the two can achieve relative rotation without contacting the ground, the resistance of the sealing component to the stirring roller is effectively reduced, and the driving component is prevented from being subjected to a large load; in addition, the sealing component is not easy to age and has a longer service life.

[0006] Preferably, the first rigid sealing sleeve comprises a first intermediate sleeve and an annular groove opened at the rear end of the first intermediate sleeve; the second rigid sealing sleeve comprises a second intermediate sleeve and an annular boss located outside the second intermediate sleeve, and the rear end of the annular boss is connected to the second intermediate sleeve through an annular connecting piece; the front end of the second intermediate sleeve passes through the first intermediate sleeve and abuts against the inner ring of the rear bearing, and the rear end of the second intermediate sleeve abuts against the shoulder of the stirring roller; the annular boss of the second rigid sealing sleeve cooperates with the annular groove corresponding to the first rigid sealing sleeve to form a labyrinth sealing structure.

[0007] Preferably, the first rigid sealing sleeve and the second rigid sealing sleeve are both made of wear-resistant rigid material to prevent aging of the sealing components.

[0008] Preferably, the wear-resistant rigid material is aluminum alloy.

[0009] As described above, the sealing assembly for a cigarette stirring device of the utility model has the following beneficial effects:

[0010] (1) The first rigid sealing sleeve and the second rigid sealing sleeve in the sealing assembly of the present application can realize non-contact relative rotation, effectively reducing or avoiding the rotational resistance of the transmission skeleton oil seal to the stirring roller, which not only reduces the friction damage of the sealing assembly, but also reduces the load requirements for the drive assembly, thereby avoiding failure of the drive assembly due to excessive load.

[0011] (2) Since the first rigid sealing sleeve and the second rigid sealing sleeve in the sealing assembly are both made of wear-resistant rigid materials that are not easily aged, the service life of the sealing assembly is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A three-dimensional diagram of a cigarette stirring device with a sealing assembly of the utility model installed (the driving assembly is not shown).

[0013] Figure 2 for Figure 1 Rear view of.

[0014] Figure 3 for Figure 2 AA direction schematic diagram.

[0015] Figure 4 It is a cross-sectional view of the first sealing sleeve.

[0016] Figure 5 It is a cross-sectional view of the second sealing sleeve.

[0017] Description of Reference Numerals

[0018] Transmission box 1, rack 2, gear 3, stirring roller 4, front bearing 5, rear bearing 6, sealing assembly 7, first sealing sleeve 71, first intermediate sleeve 711, annular groove 712, second sealing sleeve 72, second intermediate sleeve 721, annular boss 722, annular connecting piece 723. DETAILED DESCRIPTION

[0019] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0020] See also Figures 1 to 5 It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportion relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0021] The cigarette stirring device is configured on the tobacco packaging machine, and is mainly used to stir the cigarettes so that the adjacent cigarettes can enter the down-flow channel one by one, avoiding multiple cigarettes crowding at the entrance of the down-flow channel and causing the down-flow channel to be blocked. Figures 1 to 3 As shown, it includes a transmission box 1, a rack 2 horizontally slidably arranged in the transmission box 1, a plurality of gears 3 located in the transmission box 1 and meshing with the rack 2, a stirring roller 4 coaxially fixed on each gear 3, and a driving assembly for driving the rack 2 to reciprocate. For the convenience of description, the application defines the length direction of the rack 2 (i.e., the sliding direction) as the left-right direction, the height direction of the rack 2 as the up-down direction, and the width direction of the rack 2 as the front-back direction; based on this, Figure 3 In the view, the left side and the right side of the paper are the front direction and the rear direction respectively, the upper side and the lower side of the paper are the upper direction and the lower direction respectively, and the inner side and the outer side of the paper are the right direction and the left direction respectively.

[0022] In the cigarette stirring device, a horizontal slide groove for the rack 2 to slide left and right and mounting holes for mounting each stirring roller 4 are provided on the transmission box 1; each mounting hole is connected to the horizontal slide groove, and the axis of the mounting hole is perpendicular to the horizontal slide groove; the front end of the stirring roller 4 extends into the corresponding mounting hole and is fixedly connected to the gear 3, and is rotatably mounted in the corresponding mounting hole through the front bearing 5 and the rear bearing 6; wherein the front bearing 5 and the rear bearing 6 are respectively located at the front and rear ends of the gear 3, and the front end of the gear 3 cooperates with the bearing baffle at the front end of the stirring roller 4 to limit the internal rotation of the front bearing 5. The front bearing 5 is provided with a spacer sleeve which abuts against the outer ring of the front bearing 5 at the front end. Since the rear end of the stirring roller 4 is located outside the transmission case 1, in order to prevent the lubricating oil in the transmission case 1 from leaking from the rear side of the transmission case 1 through the mounting hole, a sealing assembly 7 is required to be arranged between the transmission case 1 and the stirring roller 4. The existing sealing assembly 7 is a skeleton oil seal which is interference fitted on the stirring roller 4. The rubber sealing lip on the skeleton oil seal is very easy to fail due to wear and aging, and the skeleton oil seal will exert a large rotation resistance on the stirring roller 4, increasing the load of the driving assembly.

[0023] Based on this, this embodiment provides a new sealing assembly for a cigarette stirring device to replace the skeleton oil seal in the existing cigarette stirring device. Figure 3As shown, the sealing assembly 7 of this embodiment is arranged in the mounting hole and is located at the rear end of the rear bearing 6; the sealing assembly 7 includes a first rigid sealing sleeve 71 and a second rigid sealing sleeve 72; wherein, the first rigid sealing sleeve 71 is interference fit in the mounting hole, and the front end of the first rigid sealing sleeve 71 abuts against the outer ring of the bearing of the rear bearing 6 to achieve the sealing fixation of the first rigid sealing sleeve 71 and the transmission box 1; the second rigid sealing sleeve 72 is interference fit on the stirring roller 4, and the two ends of the second rigid sealing sleeve 72 abut against the inner ring of the bearing of the rear bearing 6 and the shoulder of the stirring roller 4 respectively to achieve the sealing fixation of the second rigid sealing sleeve 72 and the stirring roller 4; the second rigid sealing sleeve 72 and the first rigid sealing sleeve 71 can rotate relative to each other and form a labyrinth sealing structure between the two.

[0024] Since the second rigid sealing sleeve 72 and the first rigid sealing sleeve 71 can rotate relative to each other, the sealing assembly 7 can be effectively prevented from generating resistance that inhibits the rotation of the stirring roller 4. This not only prevents the driving assembly from being subjected to unnecessary loads, but also prevents the sealing assembly 7 and the stirring roller 4 from being damaged due to relative friction, thereby increasing the service life of the sealing assembly 7.

[0025] Due to the labyrinth sealing structure formed between the second rigid sealing sleeve 72 and the first rigid sealing sleeve 71, the lubricating oil has a throttling effect when passing through the tortuous labyrinth sealing structure to achieve the purpose of preventing leakage. At the same time, it can also isolate external impurities and prevent the lubricating oil in the transmission box 1 from deteriorating. In addition, the thermodynamic effect and breathability effect of the labyrinth sealing structure can also better dissipate the heat of the lubricating oil, ensuring that the gear rack can work at a relatively low temperature, thereby improving the service life of the gear rack assembly.

[0026] In addition, since the first rigid sealing sleeve 71 and the second rigid sealing sleeve 72 are not easy to deform, the sealing assembly 7 composed of the first rigid sealing sleeve 71 and the second rigid sealing sleeve 72 can not only have the sealing function, but also limit the rearward movement of the outer ring and the inner ring of the rear bearing 6, thereby reducing the setting of additional axial limit members.

[0027] Preferably, if Figures 3 to 5As shown, the first rigid sealing sleeve 71 includes a first intermediate sleeve 711 and an annular groove 712 opened at the rear end of the first intermediate sleeve 711; the second rigid sealing sleeve 72 includes a second intermediate sleeve 721, an annular boss 722 located outside the second intermediate sleeve 721, and an annular connector 723, wherein the second intermediate sleeve 721, the annular boss 722 and the annular connector 723 are integrally formed, and the rear end of the annular boss 722 is connected to the outer wall of the second intermediate sleeve 721 through the annular connector 723; the front end of the second intermediate sleeve 721 passes through the first intermediate sleeve 711 and abuts against the inner ring of the rear bearing 6, and the rear end of the second intermediate sleeve 721 abuts against the shoulder of the stirring roller 4; in this way, the annular boss 722 of the second rigid sealing sleeve 72 cooperates with the annular groove 711 corresponding to the first rigid sealing sleeve 71 to form a labyrinth sealing structure.

[0028] It can be understood that the annular boss 722 of the second rigid sealing sleeve 72 is arranged in a one-to-one correspondence with the annular groove 711 of the first rigid sealing sleeve 71, and the number of the annular boss 722 can be determined according to actual conditions; based on installation space considerations, the number of the annular boss 722 and the annular groove 712 in this embodiment is set to one each.

[0029] In order to extend the service life of the sealing assembly 7, the first rigid sealing sleeve 71 and the second rigid sealing sleeve 72 are both made of wear-resistant rigid materials that are not prone to aging, such as aluminum alloy or stainless steel; in this embodiment, aluminum alloy is preferably used.

[0030] Using the sealing assembly of the present application to replace the original skeleton oil seal in the cigarette stirring device can effectively reduce the rotational resistance of the stirring roller 4. On the one hand, it can reduce the load of the driving assembly and avoid overload problems of the driving assembly; on the other hand, it can reduce the replacement frequency of the sealing assembly and the gear rack assembly, and reduce the replacement and maintenance costs of the cigarette stirring device.

[0031] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A sealing assembly for a cigarette stirring device, the cigarette stirring device comprising a transmission box (1), a rack (2) slidably arranged in the transmission box (1) along the left-right direction, a plurality of gears (3) located in the transmission box (1) and meshing with the rack (2), a stirring roller (4) coaxially fixed to each gear (3) and a driving assembly for driving the rack (2) to move; the stirring roller (4) is rotatably mounted on the transmission box (1) through a front bearing (5) and a rear bearing (6), and the rear end of the stirring roller (4) protrudes from the transmission box (1); the sealing assembly (7) is arranged between the transmission box (1) and the stirring roller (4), and the sealing assembly (7) is located at the rear end of the rear bearing (6); characterized in that, The sealing assembly (7) comprises a first rigid sealing sleeve (71) and a second rigid sealing sleeve (72); the first rigid sealing sleeve (71) is sealingly fixed on the transmission case (1), and the front end of the first rigid sealing sleeve (71) abuts against the outer ring of the rear bearing (6); the second rigid sealing sleeve (72) is sealingly fixed on the stirring roller (4), and the two ends of the second rigid sealing sleeve (72) abut against the inner ring of the rear bearing (6) and the shoulder of the stirring roller (4) respectively; the second rigid sealing sleeve (72) and the first rigid sealing sleeve (71) can rotate relative to each other and form a labyrinth sealing structure between the two.

2. A sealing assembly for a cigarette stirring device according to claim 1, characterized in that: The first rigid sealing sleeve (71) comprises a first intermediate sleeve (711) and an annular groove (712) provided at the rear end of the first intermediate sleeve (711); the second rigid sealing sleeve (72) comprises a second intermediate sleeve (721) and an annular boss (722) located outside the second intermediate sleeve (721), and the rear end of the annular boss (722) is connected to the second intermediate sleeve (721) via an annular connecting piece (723); the front end of the second intermediate sleeve (721) passes through the first intermediate sleeve (711) and abuts against the inner ring of the rear bearing (6), and the rear end of the second intermediate sleeve (721) abuts against the shaft shoulder of the stirring roller (4); the annular boss (722) of the second rigid sealing sleeve (72) cooperates with the annular groove (712) corresponding to the first rigid sealing sleeve (71) to form a labyrinth sealing structure.

3. A sealing assembly for a cigarette stirring device according to claim 1, characterized in that: The first rigid sealing sleeve (71) and the second rigid sealing sleeve (72) are both made of a wear-resistant rigid material that is not prone to aging.

4. A sealing assembly for a cigarette stirring device according to claim 3, characterized in that: The wear-resistant rigid material is aluminum alloy.

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