Pre-closing device

Abstract

The invention discloses a pre-closing device which comprises a closing assembly and two air breaking pieces, the closing assembly is arranged below a converging drum and comprises two closing pieces which are symmetrically arranged, and the two closing pieces are located at the inner end and the outer end of the converging drum respectively and used for closing two cigarettes on the converging drum towards a filter stick in the middle; the two air breaking pieces are arranged on an air valve in the converging drum, correspond to the two sets of cigarette air suction holes respectively, are located in the working area of the collecting piece and are used for reducing the adsorption force of the converging drum to the cigarettes in the working area of the collecting piece. According to the device, a physical blocking mode is adopted, so that the phenomenon that tobacco powder splashes at the confluence drum is greatly reduced, the purpose of reducing tobacco powder included in tipping paper is achieved, meanwhile, flying-out of tobacco shreds at the end of a cigarette can be effectively reduced, the filling amount of the tobacco shreds of the cigarette is guaranteed, and then the quality of the cigarette is guaranteed. In addition, the resistance in the process of closing the cigarette is reduced through the air breaking piece, and the risk caused by the contact cigarette can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of filter tip assembling machines, and in particular to a pre-closing device used between a merging drum and a closing drum of a filter tip assembling machine. Background Art

[0002] like Figure 1 As shown, the finished cigarette connecting process is to first cut the double-length cigarette into two single-length cigarettes by the first slitting circular knife, separate them at a certain distance by the separation drum, and then connect a double-length filter tip between the two single-length cigarettes at the converging drum. After being aligned by the approaching drum, they are wrapped with latex-coated kraft paper and twisted into double-length filter tip cigarettes. The double-length filter tip cigarette is cut by the second slitting circular knife to form two single-length filter tip cigarettes, i.e. the final finished cigarette. When the single-length cigarette and the double-length filter tip are at the converging drum, the tobacco at the end of the single-length cigarette is affected by the centrifugal force due to the rotation of the converging drum, and the falling tobacco foam flies between the approaching drum and the washboard, eventually leading to the formation of cigarettes sandwiched with kraft paper foam.

[0003] At present, the main methods of removing droplets are blowing removal and suction removal. The main idea of ​​blowing removal is to blow the tobacco out of the equipment through compressed air between the kraft paper cutter and the approaching drum. However, the blowing method may cause the junction position of the kraft paper to shift and the kraft paper to fold.

[0004] Suction cleaning is to use negative pressure suction between the converging drum and the approaching drum to suck away the tobacco shreds and cigarette dust, such as disclosed in Chinese patent applications CN112931926A and CN103720027A. However, such suction devices are limited by the space between the approaching drum and the converging drum, and their range of action is relatively small, and they cannot clean the droplets generated after passing through the suction devices.

[0005] Based on this, a device that can effectively reduce droplets is needed. Summary of the invention

[0006] In view of the above problems, the present invention provides a pre-closing device, which can effectively reduce droplets and prevent the generation of contact smoke, and can effectively improve the quality of cigarettes.

[0007] Specifically, the present invention provides a pre-approaching device, comprising:

[0008] The gathering component is arranged below the converging drum and is used to gather the two cigarettes on the converging drum toward the filter rod in the middle;

[0009] There are two air cut-off members, both of which are arranged on the air valve inside the confluence drum and correspond to two groups of cigarette suction holes respectively. The air cut-off members are located in the working area of the gathering member, and are used to reduce the number of cigarette suction holes in the confluence drum without changing the negative-pressure air, so as to reduce the adsorption force of the confluence drum on the cigarettes in the working area of the gathering assembly.

[0010] Furthermore, the gathering assembly includes two symmetrically arranged gathering members, which are respectively located at the outer edges at both ends of the confluence drum inside and outside, and are used to gather two cigarettes in the cigarette groove on the outer surface of the confluence drum towards the filter rod in the middle.

[0011] Furthermore, the gathering member is an arc-shaped gathering plate, and a gradually narrowing channel is formed between the two gathering plates, so that two cigarettes on the confluence drum are gathered towards the filter rod in the middle, and the air cut-off member corresponds to the position of the channel.

[0012] Furthermore, the distance between the two gathering plates is configured to be adjustable.

[0013] Furthermore, the gathering assembly further includes:

[0014] A positioning seat is arranged below the confluence drum, and the gathering plate is installed on the positioning seat through a gathering bracket;

[0015] A cigarette guiding plate is arranged on the positioning seat and is located between the two gathering plates. The whole is arc-shaped and concentric with the confluence drum.

[0016] Furthermore, a waist-shaped hole is provided at the bottom of the gathering bracket, and a bolt passes through the waist-shaped hole and is connected to the positioning seat, so that the distance between the two gathering plates is adjustable.

[0017] Furthermore, the air cut-off member is arc-shaped and is arranged along the rotation direction of the confluence drum. The outer surfaces of the two air cut-off members respectively fit any one of the cigarette suction holes in the two groups of cigarette suction holes in the working area of the gathering member.

[0018] Furthermore, the central angle of the gathering plate is greater than 60°.

[0019] Working principle:

[0020] After the cigarettes and filter rods are transported to the merging drum 6 (the middle is a double-length filter rod 82, and the inner and outer ends are single-length cigarettes 81), the merging drum 6 rotates clockwise to drive the filter rods and cigarettes to move toward the closing drum 7. When moving to the closing member, the cigarettes at both ends gradually close inward under the guidance of the closing member. During this process, the outer ends are blocked by the closing member to prevent the tobacco shreds at the outer ends from falling off. At the same time, the cigarettes at the inner and outer ends close to the middle filter rod, and the filter rod can be used to block the inner end of the cigarette to prevent the tobacco shreds at the inner end from falling off. During the closing process, the cigarette guide plate 4 is used to support the cigarette to a certain extent to prevent the cigarette from falling off from the merging drum 6. The closed cigarettes and filter rods form a cigarette group, which is finally transported to the closing drum 7.

[0021] Considering that in the process of pre-approaching, due to the differences in the equipment itself and the debugging accuracy, there is a risk of insufficient filling of the cigarette ends when the cigarettes are approaching. The direct contact surface of the cigarettes in the approaching process is the gathering part. The gathering part only considers the adsorption force caused by the negative pressure of the merging drum 6 in the process of approaching the cigarettes (the friction force caused by the weight of a single cigarette is negligible). The friction force caused by the adsorption force is its main resistance. The greater the resistance, the higher the risk of contacting cigarettes in the approaching process, and vice versa. The calculation formula is as follows:

[0022] F μ =μ*N, N=P*S*X

[0023] Among them, μ represents the friction coefficient, which is related to the converging drum and the cigarette paper material and is a fixed value; N represents the pressure on the cigarette caused by the negative pressure of the converging drum; P represents the negative pressure value of the converging drum (in normal operation, its ideal value is a constant); S represents the contact area between a single cigarette suction hole and the cigarette (since the groove depth and groove width of the drum wheel are fixed, S is a fixed value); X is the number of cigarette suction holes in a single groove.

[0024] From the above, it can be obtained that the resistance encountered in the process of bringing cigarettes together is: Fμ=μ*N=μ*S*P*X, from which it can be obtained that: μ, S and P are all fixed values, so the resistance F of cigarettes approaching is proportional to the number of suction holes X. Based on this, by reducing the number of cigarette suction holes of the converging drum 6 without changing the negative pressure wind, the resistance encountered in the process of bringing cigarettes together can be reduced, thereby reducing the risk of contact cigarettes.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The device provided by the present invention adopts a physical blocking method to greatly reduce the splashing phenomenon of smoke foam at the converging drum, thereby achieving the purpose of reducing the foam trapped in the tipping paper.

[0027] (2) It can effectively reduce the flying of tobacco at the end of the cigarette, ensure the filling amount of tobacco in the cigarette, and further ensure the quality of the cigarette.

[0028] (3) By reducing the resistance during the process of approaching the cigarette rod, the risk of contact head cigarettes can be effectively reduced. Description of the Drawings

[0029] Figure 1 is a flow chart of cigarette rod production;

[0030] Figure 2 is a schematic diagram of the usage state of the pre-approaching device in Embodiment 1;

[0031] Figure 3 is a bottom view of the closing assembly in the usage state in Embodiment 1;

[0032] Figure 4 is a schematic structural diagram of the closing assembly in Embodiment 1;

[0033] Figure 5 is an exploded view of the closing assembly in Embodiment 1;

[0034] Figure 6 is a side view of the closing assembly in Embodiment 1;

[0035] Figure 7 is a schematic principle diagram of the closing assembly in Embodiment 1;

[0036] Figure 8 is a schematic structural diagram of the air valve in Embodiment 1;

[0037] Figure 9 is an exploded view of the converging drum in Embodiment 1;

[0038] Figure 10 is a perspective view of the converging drum in Embodiment 1;

[0039] Figure 11 is a schematic diagram of the drum groove of the converging drum in Embodiment 1.

[0040] Reference Signs:

[0041] 1 - positioning seat; 2 - closing bracket; 3 - closing plate; 31 - closing section; 32 - holding section; 4 - cigarette supporting guide plate; 41 - cigarette supporting guide plate bracket; 5 - closing adjustment shaft; 51 - screw; 6 - converging drum; 61 - air valve; 62 - air cut-off member; 63 - cigarette rod suction hole; 7 - approaching drum; 81 - single-length cigarette rod; 82 - double-length filter tip. Detailed Embodiments

[0042] The present invention will be further described in detail below in conjunction with the drawings through specific embodiments.

[0043] Embodiment 1

[0044] As Figure 2-7As shown, this embodiment provides a pre-closing device of the present invention, including: a folding assembly and a wind-blocking member 62, the folding assembly is located at the lower left of the converging drum 6, and the wind-blocking member 62 is arranged on the air valve 61 of the converging drum 6. The folding assembly includes a positioning seat 1, a folding plate 3 and a smoke-supporting guide plate 4. The positioning seat 1 is made of 45# steel, and is fixed to the machine support frame flat plate at the lower left of the converging drum 6 by M8 bolts, specifically between 6 o'clock and 9 o'clock. The folding plate 3 is installed on the positioning seat 1 through the folding bracket 2. The folding bracket 2 is in the shape of "⊥" as a whole, and a waist-shaped hole is arranged on its bottom plate, so that the distance between the two folding plates 3 can be adjusted.

[0045] The gathering plate 3 is fixed on the top of the gathering bracket 2. It is made of 304 stainless steel and is in an arc shape concentric with the converging drum 6. It consists of a gathering section 31 and a retaining section 32. The gathering section 31 is in a shape that gradually closes along the rotation direction of the converging drum 6. A gathering channel is formed between the two gathering sections 31. The spacing at the entrance of the gathering channel is 178mm, and the spacing at the exit is 168mm. Figure 7 As shown, after the single-length cigarette 81 and the double-length filter 82 are conveyed to the merging drum 6, the clockwise rotating merging drum drives the double-length filter 82 and the single-length cigarette 81 to move toward the closing drum. When moving to the closing section 31, the single-length cigarettes 81 at both ends are gradually closed inwardly under the guidance of the closing section 31, and the closing distance is 6mm (that is, a single cigarette moves inwardly by 3mm). During this process, the outer end of the single-length cigarette 81 is blocked by the closing section 31 to prevent the tobacco shreds at the outer end of the single-length cigarette 81 from falling off. At the same time, the single-length cigarettes 81 at the inner and outer ends are closed to the double-length filter 82 in the middle, and the double-length filter 82 can be used to block the inner end of the single-length cigarette 81 to prevent the tobacco shreds at the inner end from falling off. After being folded into place, it enters the holding section 32 and keeps the outer end of the single-length cigarette 81 blocked until it reaches the junction of the merging drum 6 and the approaching drum 7.

[0046] A screw rod 51 is provided on the inner wall of the folding bracket 2, and the two screw rods 51 are connected by a folding adjustment shaft 5. The screw holes at both ends of the folding adjustment shaft 5 have reverse threads, that is, one end is a right-handed thread and the other end is a left-handed thread. When the screw rod 51 rotates clockwise or counterclockwise, the two folding brackets 2 can be moved to expand or contract, so as to achieve the effect of fine-tuning the spacing.

[0047] Table 1 Statistics of defects of tipping paper clips and wrinkled cigarettes in the production of brand A:

[0048]

[0049] It can be seen from the above table that in the three batches using the device, the number of cigarettes with cork paper clips decreased significantly, which was better than the three batches without the device.

[0050] The known retraction distance is 3 mm. It is necessary to study the gradual retraction process and analyze its influence on cigarette wrinkles. When the outer dimensions of the retraction plate 3 correspond to 1 groove, 2 grooves, and 3 grooves of the confluence drum 6 respectively, a model of the retraction plate 3 is made to experiment on its influence on cigarette wrinkles and collect data. The results are shown in Table 2.

[0051] Table 2 Statistics on the Influence of Different Outer Dimensions of the Retraction Plate on Cigarette Wrinkles

[0052] Number of grooves corresponding to the drum Number of crinkled cigarettes per 1000 cigarettes Defect rate 1 8 0.8％ 2 4 0.4％ 3 2 0.2％

[0053] When the retraction plate 3 corresponds to only 1 drum groove, the generation of cigarette wrinkles is likely to occur due to too fast retraction. Before the cigarette group handover is completed during the retraction process, the slower the transition of the outer dimension of the working surface of the retraction plate 3, the smoother the retraction process, and the generation of cigarette wrinkles can be avoided. Therefore, to avoid the generation of cigarette wrinkles, the outer dimension of the working surface of the retraction plate 3 is at least larger than 3 drum grooves, that is, its central angle is greater than 60°. In this embodiment, it is 65.34°.

[0054] The cigarette supporting guide plate 4 is fixed on the positioning seat 1 through the cigarette supporting guide plate bracket 41. It is made of 304 stainless steel as a whole. The cigarette supporting guide plate 4 is coaxial with the confluence drum 6, and its radius = the radius of the confluence drum + half of the cigarette diameter + 0.2 mm. It supports the cigarette group (composed of 2 single-length cigarettes 81 and 1 double-length filter tip 82) after retraction on the confluence drum 6 to avoid the situation of the cigarette group falling off.

[0055] As Figure 8-11 shown, there are two air cut-off members 62, which are arc-shaped nylon blocks as a whole, and are fixed on the air valve 61 through bolts. They are arranged along the rotation direction of the confluence drum 6, so as to cut off the air flow to the cigarette suction holes 63 on 2 drum grooves. Specifically, the two air cut-off members 62 respectively correspond to the cigarette suction hole groups of the two single-length cigarettes 81, and the air cut-off area is at the second cigarette suction hole 63 from the edge of the confluence drum 6 inward in the cigarette suction hole group. The outer surfaces of the two air cut-off members 62 are respectively attached to the second cigarette suction hole 63 in the working area of the retraction plate 3 to cut off the air suction of the second cigarette suction hole 63 during the cigarette consideration process, reduce the adsorption force on the cigarette, and avoid the situation of contact cigarettes caused by insufficient filling amount at the end of the cigarette during the process of the cigarettes approaching each other.

[0056] The above uses specific examples to elaborate on the present invention, which is only used to help understand the present invention and does not limit the present invention. For those skilled in the technical field to which the present invention belongs, according to the idea of the present invention, several simple deductions, deformations or substitutions can also be made.

Claims

1. A pre-approaching device, characterized in that: include: A gathering component is arranged below the converging drum (6) and is used to gather two cigarettes on the converging drum (6) toward the filter rod in the middle; Two wind-blocking members are provided. Both wind-blocking members are provided on the wind valve (61) inside the merging drum (6) and correspond to two groups of cigarette suction holes respectively. The wind-blocking members are located in the working area of ​​the gathering component and are used to reduce the number of cigarette suction holes (63) of the merging drum (6) without changing the negative pressure wind, thereby reducing the suction force of the merging drum (6) on cigarettes in the working area of ​​the gathering component.

2. The pre-closing device according to claim 1, characterized in that: The gathering component comprises two symmetrically arranged gathering pieces, which are respectively located at the outer edges of the inner and outer ends of the merging drum (6) and are used to gather two cigarettes in the cigarette groove on the outer surface of the merging drum (6) toward the filter rod in the middle.

3. The pre-closing device according to claim 2, characterized in that: The gathering member is an arc-shaped gathering plate (3), and a gradually gathering channel is formed between the two gathering plates (3), so that the two cigarettes on the converging drum (6) are gathered towards the filter rod in the middle.

4. The pre-closing device according to claim 3, characterized in that: The two folding plates (3) are arranged so that the distance between them can be adjusted.

5. The pre-closing device according to claim 4, characterized in that: The folding assembly also includes: A positioning seat (1) is arranged below the converging drum (6), and the gathering plate (3) is mounted on the positioning seat (1) via a gathering bracket (2); The smoke guiding plate (4) is arranged on the positioning seat (1) and is located between the two gathering plates (3). The smoke guiding plate (4) is in an arc shape as a whole and is concentric with the converging drum (6).

6. The pre-closing device according to claim 5, characterized in that: The bottom of the folding bracket (2) is provided with a waist-shaped hole, and a bolt passes through the waist-shaped hole to connect with the positioning seat (1), so that the distance between the two folding plates (3) can be adjusted.

7. The pre-closing device according to claim 1, characterized in that: The wind-blocking members are arc-shaped and arranged along the rotation direction of the merging drum (6). The outer surfaces of the two wind-blocking members respectively fit into any one of the two groups of cigarette suction holes (63) in the working area of ​​the collection member.

8. The pre-closing device according to claim 3, characterized in that: The central angle of the gathering plate (3) is greater than 60°.

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