An online testing system for the tightness of cigarette box packaging.

Abstract

The present invention relates to a system for online detection of the package airtightness of cigarette packets, comprising: a first conveyor belt; a plurality of detection box bases arranged on the first conveyor belt at predetermined intervals, the cigarette packets being transported onto each detection box base in turn; a second conveyor belt arranged above the first conveyor belt, the center plane of the second conveyor belt coinciding with the center plane of the first conveyor belt; and a plurality of detection box bases arranged on the first conveyor belt at predetermined intervals, the cigarette packets being transported onto each detection box base in turn. a plurality of detection box covers disposed on the second conveyor belt, each having a slit on one side, the detection box cover located on the lower end surface of the second conveyor belt cooperating with the detection box base directly below the second conveyor belt during the detection; and a detection probe that is aligned with the slit during the detection so as to detect the package airtightness of the cigarette packets located within the detection box cover through the slit. The detection system can detect the package airtightness of the cigarette boxes online for each package at a high throughput, thereby realizing online quality control.

Description

[Technical Field]

[0001] The present invention relates to the field of tobacco detection, and in particular to a system for online monitoring of the package tightness of cigarette packets. [Background technology]

[0002] Cigarette packaging is the final production step for finished cigarettes, and the airtightness of the cigarette packet packaging has a significant impact on the quality of the cigarettes. Accurate detection of the airtightness of the cigarette packet packaging not only ensures the interests of consumers, but also provides guidance for cigarette manufacturers to improve the cigarette packaging process and the quality of cigarette products.

[0003] According to Non-Patent Document 1 issued by the State Tobacco Monopoly Administration, the method is only suitable for measuring the seal level of soft-packaged cigarettes and does not have high test accuracy, so the method has been discontinued. Chinese Patent (Patent Document 1) discloses a method for measuring the seal level of cigarette packet packaging, which can identify the location of air leaks based on pressure detection for detecting the seal level of cigarette packages. Chinese Patent (Patent Document 2) discloses a cigarette package seal detection device, which includes a test body A and a heat-sealing device B, which can visually determine the seal level and leak location of cigarette packages. Chinese Patent (Patent Document 3) discloses a method and device for detecting the seal level of cigarette wrappers based on pressure detection, in which a pressure difference is generated between the internal and external environments of the cigarette packet, and the pressure value of the external environment of the cigarette packet is collected in real time until the internal pressure and external pressure of the cigarette packet are equilibrated, and a pressure fluctuation curve is obtained according to the pressure value of the external environment of the cigarette packet at each moment, and the seal level of the cigarette package wrapper is determined according to the pressure change rate.

[0004] All of the above methods are based on offline laboratory analysis and cannot realize packet-by-packet detection of cigarette packets on the production line, so they can only realize quality tracking of the seal degree of cigarette packets, but cannot realize online quality control. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] China Patent Publication No. 104792470 [Patent Document 2] China Utility Model No. 207662572 [Patent Document 3] Chinese Patent No. 103969423 [Non-patent literature]

[0006] [Non-Patent Document 1] Industry Standard YC / T140-1998, i.e., "Inflation Testing Method for the Sealing Degree of Cigarette Packets" Summary of the Invention

[0007] In order to solve the above problems, the present invention provides a system for detecting the package airtightness of cigarette packets online, which can detect the package airtightness of cigarette packets online for each packet with high throughput, thereby realizing online quality control.

[0008] The detection system according to the present invention comprises a first conveyor belt, a plurality of detection box bases provided on the first conveyor belt at predetermined intervals, wherein the cigarette packets to be detected are transported sequentially onto each of the plurality of detection box bases, a second conveyor belt disposed above the first conveyor belt, wherein the center plane of the second conveyor belt coincides with the center plane of the first conveyor belt, and a plurality of detection box covers disposed on the second conveyor belt at predetermined intervals, wherein each detection box cover has an internal cavity and one of the detection box covers. a plurality of detection box covers each having a rectangular parallelepiped structure with an opening on an end surface, a slit formed on one side of the detection box cover, and during the detection, the detection box cover located on the lower end surface of the second conveyor belt cooperates with the detection box base directly below through the opening to receive the cigarette packet into the cavity; and a detection probe located directly below the lower end surface, which contacts the one side of the detection box cover during the detection and is aligned with the slit so as to detect the package airtightness of the cigarette packet located within the detection box cover through the slit.

[0009] According to one embodiment, the detection probe may include a sealing device that contacts the one side and seals the detection box cover during the detection, a gas flow conducting device that is positioned at the center of the sealing device and communicates with the slit during the detection to provide a constant suction gas flow inside the detection box cover, and a pressure monitoring element that is connected to the gas flow conducting device and monitors pressure changes in the gas flow conducting device.

[0010] Alternatively, the gas flow conducting device may comprise a negative pressure generating system and a flow controller to generate a constant gas flow.

[0011] The pressure change is expressed by the following formula:

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[0012] According to another embodiment, each of the plurality of detection box bases may comprise a hard bottom plate fixed onto the first conveyor belt, a soft sealing pad disposed on the hard bottom plate, and a fixing member disposed on the soft sealing pad and used to fix the cigarette packet.

[0013] Optionally, the detection system of the present invention may further comprise a cigarette packet removal device arranged downstream of the first conveyor belt in the conveying direction of the cigarette packets, which removes the cigarette packets whose seal strength exceeds a predetermined threshold.

[0014] Preferably, the running speed of the first conveyor is the same as the running speed of the second conveyor.

[0015] According to one example, the time during which the detection probe is in contact with the slit is between 0.05 seconds and 0.1 seconds.

[0016] Alternatively, the second conveyor belt may have an inverted trapezoidal configuration.

[0017] According to another example, each of the plurality of detection box covers can be made from a hard material.

[0018] The above and other aspects and features of the present invention will become apparent from the following description of the embodiments, which proceeds with reference to the accompanying drawings. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic diagram of the overall structure of a detection system according to an embodiment of the present invention; [Figure 2] 1 is a schematic structural diagram of a measurement mechanism according to one embodiment of the present invention; [Figure 3] FIG. 10 is a schematic diagram of a detection box base structure according to another embodiment of the present invention. [Figure 4] 1 is a schematic diagram of a detection process of a detection system according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0020] Exemplary, non-limiting embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which a system for online detection of the tightness of packaging of cigarette packets according to the present invention will be further described below.

[0021] As shown in Figure 1, the detection system of the present invention comprises a moving mechanism having a first conveyor belt 1 and a second conveyor belt 2, and a measurement mechanism having a plurality of detection boxes and detection probes 3, each of which is formed by a detection box cover 4 and a detection box base 5.

[0022] Specifically, multiple detection box bases 5 are provided at predetermined intervals on the first conveyor belt 1, and the cigarette packets 6 to be detected are transported to each detection box base 5 in turn. The second conveyor belt 2 is disposed above the first conveyor belt 1, and the center plane of the second conveyor belt coincides with the center plane of the first conveyor belt. For example, the second conveyor belt may have an inverted trapezoid structure, as shown in FIG. 1 . Multiple detection box covers 4 each have a rectangular parallelepiped structure with an internal cavity and openings on its end faces, and a slit 41 on one side. They are provided at predetermined intervals on the second conveyor belt 2. During detection, the detection box cover 4 located on the lower end face of the second conveyor belt 2 cooperates with the detection box base directly below through the opening to receive the cigarette packets into the cavity. The size of the detection box cover matches the size of the detection box base so that it fits snugly over the detection box base during detection. For example, the detection box cover can be made of a hard material such as stainless steel, aluminum alloy, engineering plastic, etc. The detection probe 3 is disposed directly below the lower end surface of the second conveyor belt 2, and is aligned with the slit 41 so as to contact the one side surface of the detection box cover 4 during detection and detect the airtightness of the package of cigarette packets located inside the detection box cover through the slit 41.

[0023] The detection system can adjust the number of detection box covers, the number of detection box bases, the running speed of the first conveyor belt, and the running speed of the second conveyor belt according to actual needs. For example, the first conveyor can run at the same speed as the second conveyor. When the detection box cover 4 moves to the lower end surface of the second conveyor belt 2, it fits snugly into the detection box base 5. The running speed of the detection box matches the running speed of the cigarette boxes, thereby achieving sequential detection of the airtightness of cigarette box packaging. Therefore, the detection system can detect the airtightness of cigarette box packaging online, packet by packet, with high throughput, thereby achieving online quality control.

[0024] According to one embodiment of the present invention, the detection probe 3 may include a sealing device 31, a gas flow conducting device 32, and a pressure monitoring element 33, as shown in FIG. 2. The sealing device 31 contacts the side of the detection box cover that forms the slit 41 during detection to seal the detection box cover. The gas flow conducting device 32 is disposed at the center of the sealing device 31 and communicates with the slit 41 during detection to provide a constant suction gas flow to the inside of the detection box cover. Preferably, the time during detection during which the detection probe contacts the slit may be 0.05 to 0.1 seconds. According to an alternative embodiment, the gas flow conducting device 32 may include a negative pressure generating system and a flow controller that generates a constant gas flow. The pressure monitoring element 33 is connected to the gas flow conducting device 32 and monitors pressure changes in the gas flow conducting device. Because the cigarette packet package has a certain gas permeability, pressure changes in the gas flow conducting device occur between the detection probe and the detection box during the sealing process. Furthermore, the pressure change is expressed by the following equation:

number

[0025] According to another embodiment of the present invention, each detection box base 5 may include a hard bottom plate 51, a soft sealing pad 52, and a fixing member 53. The hard bottom plate 51 is fixed to the first conveyor belt 1, and the soft sealing pad 52 is provided on the hard bottom plate 51. The fixing member 53 is provided on the soft sealing pad 52 to fix the cigarette packets 6. The size of the detection box cover matches the size of the detection box base, and when the detection box cover cooperates with the detection box base, the detection box cover presses the soft sealing pad 52 to store the cigarette packets and seal the detection box. Sealing the detection box means that the cavity inside the detection box is only in communication with the outside through slits on the side end surfaces of the detection box cover.

[0026] According to a preferred embodiment, the detection system according to the invention may also comprise a cigarette removal device 7, which is arranged downstream of the first conveyor belt 1 in the conveying direction of the cigarette packets and which removes cigarette packets whose sealing degree exceeds a predetermined threshold.

[0027] While exemplary embodiments of the present invention have been described, those skilled in the art will recognize that modifications can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined in the following claims and their equivalents.

Claims

1. 1. A system for detecting online package airtightness of cigarette packets, comprising: a first conveyor belt; a plurality of detection box bases provided on the first conveyor belt at predetermined intervals, the detected cigarette packets being transported sequentially onto each of the plurality of detection box bases; a second conveyor belt disposed above the first conveyor belt, the second conveyor belt having a center plane that coincides with a center plane of the first conveyor belt; a plurality of detection box covers arranged on the second conveyor belt at predetermined intervals, each detection box cover having a rectangular parallelepiped structure with an internal cavity and an opening on one end face of the detection box cover, with a slit formed on one side of the detection box cover, and during the detection, the detection box cover located on the lower end face of the second conveyor belt cooperates with the detection box base directly below through the opening to receive the cigarette packet into the cavity; a detection probe disposed directly below the lower end surface, contacting the one side surface of the detection box cover during detection, and aligned with the slit so as to detect the package airtightness of the cigarette packet located within the detection box cover through the slit; A system comprising:

2. The detection probe is a sealing device that contacts the one side surface and seals the detection box cover during the detection; a gas flow conducting device disposed at the center of the sealing device, communicating with the slit during the detection to provide a constant suction gas flow into the inside of the detection box cover; a pressure monitoring element connected to the gas flow conducting device for monitoring pressure changes in the gas flow conducting device; The system of claim 1 , comprising:

3. The system of claim 2 , wherein the gas flow conducting device comprises a negative pressure generating system and a flow controller that generates a constant gas flow.

4. The pressure change is expressed by the following formula: [Equation 1] In the formula, p ｔ is the measured pressure outside the cigarette packet, and p ｔ０ is the initial measured pressure outside the cigarette packet, and p ｅ is the final measured pressure when the pressure outside and inside the cigarette packet are in equilibrium, and V １ is the external volume of the body of the cigarette packet, t is the measurement time, and K Ｂ is the Boltzmann constant (1.38*10 －２３ J / K), T is the absolute temperature of an ideal gas, and m is the average molecular weight of air (29*1.67*10 －２７ 4. The system of claim 2 or 3, wherein A is the area of ​​the gas overflow holes in the cigarette packet.

5. Each of the plurality of detection box bases comprises: a rigid bottom plate fixed onto the first conveyor belt; a soft sealing pad disposed on the hard bottom plate; a fastening member disposed on the soft sealing pad and used to fasten the cigarette packet; The system of claim 1 , comprising:

6. a cigarette packet removal device arranged downstream of the first conveyor belt in the conveying direction of the cigarette packets, for removing the cigarette packets whose sealability exceeds a predetermined threshold; The system of claim 1 further comprising:

7. 2. The system of claim 1, wherein the travel speed of the first conveyor is the same as the travel speed of the second conveyor.

8. The system of claim 1 , wherein the time during said detection that said detection probe is in contact with said slit is between 0.05 seconds and 0.1 seconds.

9. The system of claim 1 , wherein the second conveyor belt has an inverted trapezoidal configuration.

10. The system of claim 1 , wherein each of the plurality of detection box covers is made from a rigid material.

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