Cigarette packet on-line air tightness detection system and method

Abstract

The invention relates to the technical field of cigarette packet air tightness detection, in particular to a cigarette packet on-line air tightness detection system and a cigarette packet on-line air tightness detection method. The detection motor is arranged on the outer side of the detection bracket; the screw rod and the sliding rail are arranged on the inner side of the detection bracket; the first sliding seat and the second sliding seat are arranged on the screw rod in a sliding and sleeving manner; the first sliding block and the second sliding block are respectively arranged at the upper ends of the first sliding seat and the second sliding seat; the first sealing plate and the second sealing plate are respectively arranged at the lower end of the first sliding seat, and the plurality of detection boxes are annularly arranged at the upper end of the turntable and are arranged at intervals. According to the design, a negative pressure detection method is adopted, air tightness detection of small cigarette packet transparent paper is effectively achieved, the structural complexity is low, the size is small, and the detection efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cigarette package airtightness detection, in particular to a cigarette package online airtightness detection system and method. BACKGROUND

[0002] The sealing performance of the transparent paper of the small box cigarette package is one of the key factors to ensure the quality of cigarettes. Good sealing can effectively prevent cigarettes from being damp and odor intrusion, maintain the original taste and flavor of cigarettes, and prolong the shelf life. If the transparent paper has air leakage, it will cause the cigarettes to be affected by the external environment during storage and transportation, which will seriously affect the product quality and consumer experience.

[0003] There are mainly two kinds of detection methods for the transparent paper of the small box cigarette package. One is to increase an image detection mechanism on the packaging machine to detect the appearance defects of the transparent paper, but it cannot directly detect the airtightness of the transparent paper. The other is to use another airtightness detection device for negative pressure detection, which is difficult to adapt to the existing packaging machine to form a flow process, and has a complex structure, large volume, low detection efficiency and high cost.

[0004] For example, the publication number CN118111631A, the name of the sealing detection device for the cigarette box and the leak point analysis method, although it can detect the airtightness of the transparent paper of the small box cigarette package, the device has a complex structure, large volume, low detection efficiency and cannot be adapted to the existing packaging machine. SUMMARY

[0005] In order to solve the technical problems of the existing small box cigarette package transparent paper airtightness detection device, such as complex structure, large volume, low detection efficiency and high cost, the present application provides a cigarette package online airtightness detection system and method, which effectively realizes the airtightness detection of the transparent paper of the small box cigarette package, and has low complexity, small volume and high detection efficiency.

[0006] The technical scheme adopted by the present application is to provide a cigarette package online airtightness detection system, which comprises a rack, a rotating disc rotatingly arranged on the rack, a rejection mechanism arranged at the upper middle part of the rotating disc, a detection support arranged on the rack and located at one side of the rotating disc, a detection motor arranged outside the detection support, a lead screw and a slide rail arranged inside the detection support, a first slide and a second slide slidingly sleeved on the lead screw, a first slide block and a second slide block arranged at the upper ends of the first slide and the second slide respectively, a first sealing plate and a second sealing plate arranged at the lower ends of the first slide and the second slide respectively, and a plurality of detection boxes arranged in a ring shape at the upper end of the rotating disc and spaced apart.

[0007] The detection box is in the form of a box structure with openings on the inner and outer sides, the annular movement track of the detection box passes between the first sealing plate and the second sealing plate, the first sealing plate and the second sealing plate correspond to and are adapted to the openings on the inner and outer sides of the detection box respectively, one end of the slide rail is fixed on the detection support and the other end is suspended towards the center of the turntable, the lead screw is located above the detection box and below the slide rail, one end of the lead screw is connected with the driving end of the detection motor and the other end is suspended towards the center of the turntable and is parallel to the slide rail, the upper ends of the first sliding block and the second sliding block are provided with sliding grooves and are slidingly connected with the slide rail, and the detection motor drives the lead screw to rotate to drive the first sealing plate and the second sealing plate to translate towards the inner and outer sides of the detection box respectively.

[0008] The detection box comprises a bottom plate, a left side plate, a right side plate, a top plate and a partition plate arranged between the left side plate and the right side plate, the bottom plate, the left side plate, the right side plate and the top plate form a rectangular frame structure, and the partition plate is horizontally fixed between the left side plate and the right side plate.

[0009] The rejection mechanism comprises a rejection support arranged on the rack and located at the middle part of the upper end of the turntable, a rejection motor and a smoke adding bin arranged on the rejection support, a fixing seat arranged on the rejection support, a sliding rod slidingly arranged on the fixing seat, a smoke pushing block arranged at one end of the sliding rod, and a crank connecting rod connected between the other end of the sliding rod and the driving end of the rejection motor.

[0010] The smoke adding bin is provided with a smoke pushing opening and a smoke outlet on the inner and outer sides of the bottom part and horizontally correspond to each other, the smoke outlet horizontally corresponds to the opening on the inner side of the detection box, the smoke pushing block horizontally corresponds to the smoke pushing opening, the rejection motor drives the sliding rod to translate on the fixing seat towards the inner side of the detection box through the crank connecting rod, and the sliding rod drives the smoke pushing seat to translate towards the smoke pushing opening of the smoke adding bin.

[0011] The detection support comprises an outer vertical plate fixed on the rack and located beside the turntable, a horizontal plate fixed on the inner side of the outer vertical plate and suspended towards the center of the turntable, and an inner vertical plate arranged at the inner end of the horizontal plate and corresponding to the outer vertical plate, the inner end of the lead screw is rotatably arranged on the inner vertical plate, and the slide rail is fixed on the lower end of the horizontal plate and located between the outer vertical plate and the inner vertical plate.

[0012] The upper end of the partition plate and the upper end of the bottom plate are provided with long grooves facing the inner and outer sides.

[0013] The upper end surface of the partition plate towards the inner and outer ends is provided with an inclined surface.

[0014] One side of the rejection support is provided with a smoke blocking mechanism, the smoke blocking mechanism comprises a smoke blocking support fixed at one end of the rejection support and a smoke blocking plate arranged on the smoke blocking support, the outer end of the smoke blocking support is suspended towards the detection box, and the smoke blocking plate is fixed on the suspended end of the smoke blocking support and corresponds to the opening on the inner side of the detection box.

[0015] The smoke adding chamber is a rectangular cavity structure in long strip shape and vertically arranged.

[0016] The removing mechanism further comprises a smoke guiding mechanism corresponding to the smoke pushing block outside the detection box, the smoke guiding mechanism comprises a support plate fixed on the rack, a smoke outlet arranged on the support plate, an upper support spring and a lower support spring arranged on the upper end and the lower end of the smoke outlet respectively, an upper smoke roller rotatably arranged on the upper support spring and located inside the upper side of the smoke outlet, and a lower smoke roller rotatably arranged on the lower support spring and located inside the lower side of the smoke outlet, the size of the smoke outlet is greater than the opening outside the detection box, and the distance between the upper smoke roller and the lower smoke roller is less than the height of the opening outside the detection box.

[0017] The detection system further comprises an industrial computer, a PLC controller and a touch display module electrically connected with the industrial computer, a laser sensor, a negative pressure detection sensor, a gas path opening and closing electromagnetic valve, a gas supply module, a detection control module and a removing control module electrically connected with the PLC controller respectively;

[0018] The first sealing plate or the second sealing plate is provided with a detection port and a gas supply port, the laser sensor is installed on one side of the detection support and corresponds to the detection box downward, for detecting whether the detection box is in place, the negative pressure detection sensor is installed on the rack and the detection end is connected with the monitoring hole on the first sealing plate or the second sealing plate, for collecting the air pressure data in the detection box, the gas supply module is connected with the gas supply port through the gas supply pipeline, the gas path opening and closing electromagnetic valve is installed on the gas supply pipeline and is used for opening and closing the gas supply pipeline, the detection control module is used for controlling the opening and closing of the detection motor, and the removing control module is used for controlling the opening and closing of the removing motor.

[0019] A detection method based on a cigarette packet online air tightness detection system, comprising the following steps,

[0020] S1, after the cigarette packet is conveyed into the detection box, the detection box is sealed;

[0021] S2, negative pressure gas is introduced into the detection box through the gas source;

[0022] S3, the real-time air pressure in the detection box is collected through the negative pressure sensor;

[0023] S4, whether the transparent paper packaging of the cigarette packet in the current detection box leaks is judged through the collected air pressure change curve, when the air pressure changes rapidly after fluctuation and reaches the maximum value and remains stable, it is judged that the transparent paper of the cigarette packet is not damaged, and when the air pressure changes slowly and cannot reach the maximum value after fluctuation, it is judged that the transparent paper of the current cigarette packet is damaged.

[0024] The beneficial effect of the present application is to provide a cigarette packet online airtightness detection system and method, detect motor drive screw rotation, drive the first sealing plate and the second sealing plate relative movement, tightly in the opening on both sides of the detection box, seal the detection box, the detection box in the sealed state, through the pipeline to the detection box through the gas source into the negative pressure gas, negative pressure sensor collects the negative pressure state data in the detection box, judges whether the cigarette packet transparent paper leaks through the air pressure change curve. The design only needs to be transformed on the existing rotating disc station of YB55 packaging machine, without changing the upstream and downstream mechanism of the packaging machine, and is compatible with the original water operation of the packaging machine. The design adopts the method of negative pressure detection, effectively realizes the airtightness detection of small box cigarette packet transparent paper, has low complexity, small size and high detection efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the structural schematic diagram of the present application;

[0026] Figure 2 It is the structural schematic diagram of the detection support and the first sealing plate in the present application;

[0027] Figure 3 It is the structural schematic diagram of the detection support and the first sealing plate in another direction of the present application;

[0028] Figure 4 It is the structural schematic diagram of the detection box in the present application;

[0029] Figure 5 It is the structural schematic diagram of the cigarette adding bin and the rejection support in the present application;

[0030] Figure 6 It is the structural schematic diagram of the cigarette adding bin and the rejection support in another direction of the present application;

[0031] Figure 7 It is the structural schematic diagram of the smoke guiding mechanism in the present application;

[0032] Figure 8 It is the reference diagram of the use state of the present application on the packaging machine;

[0033] Figure 9 It is the system block diagram of the present application;

[0034] Figure 10 It is the slope change reference diagram in the detection method of the present application.

[0035] In the drawings, 1 is a rack, 2 is a rotating disc, 3 is a detection support, 4 is a detection motor, 5 is a lead screw, 6 is a sliding rail, 7 is a first sliding seat, 8 is a second sliding seat, 9 is a first sliding block, 10 is a second sliding block, 11 is a first sealing plate, 12 is a second sealing plate, 13 is a detection box, 14 is an outer vertical plate, 15 is a horizontal plate, 16 is an inner vertical plate, 17 is a bottom plate, 18 is a left side plate, 19 is a right side plate, 20 is a top plate, 21 is a partition plate, 22 is a long groove, 23 is an inclined surface, 24 is a smoke adding bin, 25 is a rejection support, 26 is a rejection motor, 27 is a fixing seat, 28 is a sliding rod, 29 is a smoke pushing block, 30 is a crank connecting rod, 31 is a smoke blocking support, 32 is a smoke blocking plate, 33 is a supporting plate, 34 is a smoke discharging port, 35 is an upper supporting spring piece, 36 is a lower supporting spring piece, 37 is an upper smoke discharging roller, and 38 is a lower smoke discharging roller. DETAILED DESCRIPTION

[0036] As shown in Figures 1-4 and Figure 8 , the present application provides a cigarette packet online airtightness detection system, which comprises a rack 1, a rotating disc 2 rotatably arranged on the rack 1, a rejection mechanism arranged on the upper middle part of the rotating disc 2, a detection support 3 arranged on the rack 1 and located on one side of the rotating disc 2, a detection motor 4 arranged on the outer side of the detection support 3, a lead screw 5 and a sliding rail 6 arranged on the inner side of the detection support 3, a first sliding seat 7 and a second sliding seat 8 slidably sleeved on the lead screw 5, a first sliding block 9 and a second sliding block 10 respectively arranged on the upper ends of the first sliding seat 7 and the second sliding seat 8, a first sealing plate 11 and a second sealing plate 12 respectively arranged on the lower ends of the first sliding seat 7 and the second sliding seat 8, and a plurality of detection boxes 13 arranged in a ring shape on the upper end of the rotating disc 2 and spaced apart; the detection box 13 has an open box structure with openings on the inner and outer sides, the ring-shaped movement track of the detection box 13 passes between the first sealing plate 11 and the second sealing plate 12, the first sealing plate 11 and the second sealing plate 12 are respectively corresponding to and adapted to the openings on the inner and outer sides of the detection box 13, one end of the sliding rail 6 is fixed on the detection support 3, and the other end is cantilevered towards the center of the rotating disc 2, the lead screw 5 is located below the sliding rail 6 and above the detection box 13, one end of the lead screw 5 is connected with the driving end of the detection motor 4, and the other end is cantilevered towards the center of the rotating disc 2 and parallel to the sliding rail 6, the upper ends of the first sliding block 9 and the second sliding block 10 are both provided with sliding grooves and are slidably connected with the sliding rail 6, and the detection motor 4 drives the lead screw 5 to rotate to drive the first sealing plate 11 and the second sealing plate 12 to respectively translate towards the inner and outer sides of the detection box 13.

[0037] The rack 1 and the rotating disc 2 are existing structures of a YB55 packaging machine, the rotating disc 2 is rotatably arranged on the rack 1 and rotates under the driving of the driving mechanism of the packaging machine, one side of the rotating disc 2 is a feeding station, and the opposite side is a discharging station, after the cigarette packets are conveyed onto the rotating disc 2, they move in a ring shape along with the rotation of the rotating disc 2, and detection is performed during this period.

[0038] The detection box 13 adopts a box structure with inside and outside openings, the inside refers to the side towards the center of the turntable 2, and the outside refers to the side towards the outside of the turntable 2, a plurality of detection boxes 13 are arranged annularly on the turntable 2, and the cigarette packets are driven by the original conveying mechanism to enter the detection box 13 at the loading position of the turntable 2, and after the cigarette packets are loaded in the detection box 13, the detection box 13 is moved to the position between the first sealing plate 11 and the second sealing plate 12, i.e. the airtightness detection position, under the driving of the turntable 2.

[0039] The screw rod 5 is a positive and negative rotation screw rod structure, the detection support 3 is fixed on the original rack 1 of the packaging machine, and is used for mounting the detection motor 4, the screw rod 5, the sliding rail 6, the first sliding seat 7, the second sliding seat 8, the first sliding block 9, the second sliding block 10, the first sealing plate 11 and the second sealing plate 12, wherein the upper ends of the first sliding block 9 and the second sliding block 10 are provided with sliding grooves and are in sliding connection with the sliding rail 6, the sliding grooves adopt a notched groove structure, for example, a dovetail groove, and play a supporting and stabilizing role on the first sliding seat 7 and the second sliding seat 8.

[0040] The first sliding seat 7 and the second sliding seat 8 are mounted on the screw rod 5, in work, the detection motor 4 drives the screw rod 5 to rotate, drives the first sliding seat 7 and the second sliding seat 8 on the screw rod 5 to move relatively, and the first sealing plate 11 and the second sealing plate 12 at the lower ends of the first sliding seat 7 and the second sliding seat 8 move relatively synchronously until abutting against the openings on the two sides of the detection box 13 to seal the detection box 13.

[0041] The air source and the negative pressure sensor are also mounted at appropriate positions on the rack 1 in the sealed state of the detection box 13, the first sealing plate 11 or the second sealing plate 12 is provided with an air port, the air source is connected with the air port through a pipeline and negative pressure gas is introduced into the detection box 13, and the sensing end of the negative pressure sensor also communicates with the inside of the detection box 13 through another air port, so as to collect the negative pressure state data in the detection box 13 to determine whether the airtightness of the cigarette packet meets the requirements.

[0042] According to the air pressure change curve collected by the negative pressure sensor, the air leakage condition of the cigarette packet in the current detection box 13 is determined: when the transparent paper is completely intact, the air pressure reaches the maximum value with a fast slope after fluctuation and remains stable, when the transparent paper is damaged, the air pressure changes with a slow slope close to the maximum value after fluctuation, and the more serious the damage is, the smaller the slope of the air pressure change is and the smaller the maximum value finally reached is.

[0043] As shown in Figure 4 The detection box 13 includes a bottom plate 17, a left side plate 18, a right side plate 19, a top plate 20 and a partition plate 21 arranged between the left side plate 18 and the right side plate 19, the bottom plate 17, the left side plate 18, the right side plate 19 and the top plate 20 form a rectangular frame structure, and the partition plate 21 is horizontally fixed between the left side plate 18 and the right side plate 19.

[0044] The detection box 13 adopts a rectangular frame structure with inside and outside openings, and the inner cavity is divided into two by the partition 21. Each inner cavity is adapted to the size of a cigarette pack, that is, two cigarette packs can be loaded into the detection box 13 at the same time, further improving the detection efficiency.

[0045] As shown in Figure 1 and Figures 5-6 , the rejection mechanism includes a rejection bracket 25 arranged on the rack 1 and located at the middle part of the upper end of the turntable 2, a rejection motor 26 and a cigarette adding bin 24 arranged on the rejection bracket 25, a fixed seat 27 arranged on the rejection bracket 25, a sliding rod 28 slidingly arranged on the fixed seat 27, a cigarette pushing block 29 arranged at one end of the sliding rod 28, and a crank connecting rod 30 connected between the other end of the sliding rod 28 and the driving end of the rejection motor 26; the cigarette adding bin 24 is provided with a cigarette pushing opening and a cigarette outlet opening horizontally corresponding to the inside and outside of the bottom, the cigarette outlet opening horizontally corresponds to the inside opening of the detection box 13, the cigarette pushing block 29 horizontally corresponds to the cigarette pushing opening, and the rejection motor 26 drives the sliding rod 28 to translate on the fixed seat 27 towards the inside of the detection box 13 through the crank connecting rod 30, and the sliding rod 28 drives the cigarette pushing seat to translate towards the cigarette pushing opening of the cigarette adding bin 24.

[0046] The rejection bracket 25 is fixed on the rack 1 of the original packaging machine and hangs on the middle part of the upper end of the turntable 2, used for installing the cigarette adding bin 24 and other rejection components, the cigarette adding bin 24 is internally provided with a column of vertically arranged cigarette packs, which are good cigarette packs after testing, the cigarette outlet opening on the outside of the cigarette adding bin 24 is adjacent to and corresponds to the inside opening of the cigarette adding bin 24, the cigarette pushing opening on the inside of the cigarette adding bin 24 is adjacent to and corresponds to the cigarette pushing block 29, and the sizes of the inside opening of the detection box 13, the cigarette outlet opening, the cigarette pushing opening and the cigarette pushing block 29 are all adapted, for example, when the size of the inner cavity of the detection box 13 and the openings on both sides are adapted to two cigarette packs, the sizes of the cigarette outlet opening, the cigarette pushing opening and the cigarette pushing block 29 are adapted to the size of the two cigarette packs, and the sizes are not limited and can be designed according to needs and actual conditions.

[0047] The fixed seat 27 is provided with a horizontal sliding hole, the sliding rod 28 is slidingly inserted into the sliding hole of the fixed seat 27, and the crank connecting rod 30 is a transmission mechanism between the rejection motor 26 and the sliding rod 28, which converts the rotary motion of the rejection motor 26 into translational motion, so that the rejection motor 26 can drive the sliding rod 28 to stretch and translate,

[0048] In operation, after the airtightness detection is completed, the rotating disc 2 continues to rotate to drive the detection box 13 into the rejection station. If the airtightness of the cigarette in the detection box 13 is not qualified, the rejection motor 26 starts to work to drive the slide rod 28 to perform the extension and retraction movement on the fixed seat 27 through the crank connecting rod 30, the slide rod 28 drives the cigarette pushing block 29 to translate towards the cigarette pushing opening in the cigarette adding bin 24, the good cigarettes in the cigarette adding bin 24 are pushed into the detection box 13, and the bad cigarettes in the detection box 13 are pushed out of the opening on the outside of the detection box 13 under the pushing of the good cigarettes, and the detection box 13 is replaced with the good cigarettes. The replacement of the good cigarettes with the bad cigarettes does not affect the subsequent processes.

[0049] As shown in Figures 2-3 , the detection support 3 includes an outer vertical plate 14 fixed on the rack 1 and located beside the rotating disc 2, a horizontal plate 15 fixed on the inner side of the outer vertical plate 14 and suspended towards the center of the rotating disc 2, and an inner vertical plate 16 arranged at the inner end of the horizontal plate 15 and corresponding to the outer vertical plate 14. The inner end of the lead screw 5 is rotatably arranged on the inner vertical plate 16, and the slide rail 6 is fixed on the lower end of the horizontal plate 15 and located between the outer vertical plate 14 and the inner vertical plate 16.

[0050] The detection support 3 is designed as a suspended frame structure, and the inner end of the lead screw 5 is rotatably arranged on the inner vertical plate 16 through the shaft seat, so that the rotation of the lead screw 5 is more stable.

[0051] As shown in Figure 4 , the upper end of the partition plate 21 and the upper end of the bottom plate 17 are provided with long grooves 22 facing the inside and outside.

[0052] The length direction of the long groove 22 is consistent with the direction of the cigarette entering and sliding out of the detection box 13, which reduces the contact area between the cigarette and the detection box 13 when the cigarette slides and reduces the friction.

[0053] As shown in Figure 4 , the upper end surface of the partition plate 21 towards the two ends of the inside and outside is provided with an inclined surface 23.

[0054] The inclined surface 23 on the partition plate 21 can make the cigarette enter and slide out more conveniently and accurately.

[0055] As shown in Figures 5-6 , the rejection support 25 is provided with a cigarette blocking mechanism on one side, the cigarette blocking mechanism includes a cigarette blocking support 31 fixed at one end of the rejection support 25 and a cigarette blocking plate 32 arranged on the cigarette blocking support 31. The outer end of the cigarette blocking support 31 is suspended towards the detection box 13, and the cigarette blocking plate 32 is fixed on the suspended end of the cigarette blocking support 31 and corresponds to the opening on the inner side of the detection box 13.

[0056] The smoke baffle 32 corresponds to the inside opening of the detection box 13 at the cigarette entering position of the rotating disc 2. When the cigarette enters the detection box 13, the smoke baffle 32 limits the cigarette to avoid the cigarette from sliding out of the detection box 13 under the action of inertia, thereby improving the accuracy and stability of the cigarette entering the detection box 13.

[0057] As shown in Figure 5 , the smoke adding chamber 24 is a rectangular cavity structure in a long strip shape and vertically arranged. The cigarettes in the smoke adding chamber 24 are in a transversely lying state, which is consistent with the state of the cigarettes in the detection box 13.

[0058] As shown in Figure 5 and Figure 7 , the rejection mechanism further comprises a smoke guiding mechanism corresponding to the smoke pushing block 29 outside the detection box 13. The smoke guiding mechanism comprises a support plate 33 fixed on the rack 1, a smoke discharging port 34 arranged on the support plate 33, an upper support spring 35 and a lower support spring 36 arranged on the upper and lower ends of the smoke discharging port 34 respectively, an upper smoke discharging roller 37 rotatably arranged on the upper support spring 35 and located inside the upper side of the smoke discharging port 34, and a lower smoke discharging roller 38 rotatably arranged on the lower support spring 36 and located inside the lower side of the smoke discharging port 34. The size of the smoke discharging port 34 is greater than the outside opening of the detection box 13, and the distance between the upper smoke discharging roller 37 and the lower smoke discharging roller 38 is less than the height of the outside opening of the detection box 13.

[0059] Under the action of the rejection mechanism, the bad cigarettes in the detection box 13 are pushed out by the good cigarettes. The smoke guiding mechanism arranged at the outside opening of the detection box 13 can damp the sliding of the cigarettes in the detection box 13, thereby effectively avoiding the good cigarettes from sliding out simultaneously under the action of inertia.

[0060] The support plate 33 is a plate-shaped structure arranged vertically and adjacent to and corresponding to the outside opening of the detection box 13. The support plate 33 is provided with the smoke discharging port 34 at a position corresponding to the outside opening of the detection box 13. The size of the smoke discharging port 34 is greater than the size of the outside opening of the detection box 13. The upper support spring 35 and the lower support spring 36 are fixed on the upper and lower ends of the smoke discharging port 34 respectively. The upper support spring 35 is fixed transversely and spaced apart by two. The lower end of the upper support spring 35 extends into the smoke discharging port 34. The upper smoke discharging roller 37 is mounted on the two upper support springs 35 at both ends. The upper smoke discharging roller 37 can rotate. The lower support spring 36 and the lower smoke discharging roller 38 have the same structure as the upper support spring 35 and the upper smoke discharging roller 37. The upper support spring 35 and the lower support spring 36 are metal sheet structures with elasticity.

[0061] When the bad cigarette packet is pushed out from the detection box 13, since the distance between the upper cigarette discharging roller 37 and the lower cigarette discharging roller 38 is smaller than the opening height of the detection box 13, the upper and lower ends of the bad cigarette packet will be in close contact with the upper cigarette discharging roller 37 and the lower cigarette discharging roller 38 when sliding out, and under the pushing force of the good cigarette packet, the bad cigarette packet will push the upper cigarette discharging roller 37 outward and upward and the lower cigarette discharging roller 38 outward and downward, so as to be pushed open, until being opened to a degree suitable for the sliding out of the bad cigarette packet, and the upper and lower ends of the bad cigarette packet are in close contact with the upper cigarette discharging roller 37 and the lower cigarette discharging roller 38 when sliding out. Since the upper cigarette discharging roller 37 and the lower cigarette discharging roller 38 can rotate by themselves, the friction is small, and after the bad cigarette packet slides out, the upper cigarette discharging roller 37 and the lower cigarette discharging roller 38 return to the initial position to block the good cigarette packet, and the good cigarette packet has no subsequent pushing force, so as to prevent the upper cigarette discharging roller 37 and the lower cigarette discharging roller 38 from being opened, so that the good cigarette packet can stably and accurately enter into the detection box 13 and cannot slide out by chance, and meanwhile, the upper cigarette discharging roller 37 and the lower cigarette discharging roller 38 also play a damping role, so that the bad cigarette packet cannot fly out when sliding out, but can stably fall into the collecting box. When the rotating disc 2 continues to rotate, the detection box 13 moves to the discharging position, and the discharging mechanism of the original packaging machine is used to complete the discharging.

[0062] As shown in Figure 9 , the detection system further comprises an industrial computer, a PLC controller and a touch display module electrically connected with the industrial computer, a laser sensor, a negative pressure detection sensor, a gas path opening and closing electromagnetic valve, a gas supply module, a detection control module and a rejection control module electrically connected with the PLC controller respectively;

[0063] The first sealing plate 11 or the second sealing plate 12 is provided with a detection port and a gas supply port, the laser sensor is installed on one side of the detection support 3 and downward corresponds to the detection box 13, and is used for detecting whether the detection box 13 is in place, the negative pressure detection sensor is installed on the rack 1 and the detection end is connected with the monitoring hole on the first sealing plate 11 or the second sealing plate 12, and is used for collecting the air pressure data in the detection box 13, the gas supply module is connected with the gas supply port through a gas supply pipeline, the gas path opening and closing electromagnetic valve is installed on the gas supply pipeline and is used for opening and closing the gas supply pipeline, the detection control module is used for controlling the opening and closing of the detection motor 4, and the rejection control module is used for controlling the opening and closing of the rejection motor 26. The system has simple structure, is convenient to control and has low cost.

[0064] As shown in Figure 10 , a detection method based on a cigarette packet online air tightness detection system, comprising the following steps,

[0065] S1, after the cigarette packet is conveyed into the detection box 13, the detection box 13 is sealed;

[0066] S2, negative pressure gas is introduced into the detection box 13 through a gas source;

[0067] S3, collecting the real-time air pressure in the detection box 13 through the negative pressure sensor;

[0068] S4, judging whether the transparent paper of the cigarette packet in the detection box 13 is damaged or not by the collected air pressure change curve. When the air pressure reaches the maximum value after fluctuation and keeps stable, it is judged that the transparent paper of the cigarette packet is not damaged. When the air pressure fluctuates and cannot reach the maximum value, it is judged that the transparent paper of the cigarette packet is damaged. The more serious the damage is, the smaller the slope of the air pressure change is, and the smaller the maximum value reached is. Therefore, the condition of the transparent paper of the cigarette packet is judged. The threshold range of the slope change and the threshold range of the maximum value of the slope need to be determined by experiments according to different cigarette packets and different negative pressures.

Claims

1. A system for online detection of the air tightness of a cigarette packet, comprising a frame (1) and a rotating disc (2) rotatably arranged on the frame (1), characterized in that: Further comprising a rejection mechanism arranged in the middle of the upper end of the rotating disc (2), a detection support (3) arranged on the frame (1) and located on one side of the rotating disc (2), a detection motor (4) arranged outside the detection support (3), a lead screw (5) and a sliding rail (6) arranged inside the detection support (3), a first sliding seat (7) and a second sliding seat (8) slidingly sleeved on the lead screw (5), a first sliding block (9) and a second sliding block (10) arranged on the upper end of the first sliding seat (7) and the second sliding seat (8) respectively, a first sealing plate (11) and a second sealing plate (12) arranged on the lower end of the first sliding seat (7) respectively, and a plurality of detection boxes (13) arranged in a ring shape on the upper end of the rotating disc (2) and spaced apart; The detection box (13) is in a box structure with openings on the inner and outer sides, the ring-shaped movement track of the detection box (13) passes between the first sealing plate (11) and the second sealing plate (12), the first sealing plate (11) and the second sealing plate (12) correspond to and fit the openings on the inner and outer sides of the detection box (13) respectively, one end of the sliding rail (6) is fixed on the detection support (3) and the other end is cantilevered towards the center of the rotating disc (2), the lead screw (5) is located below the sliding rail (6) and above the detection box (13), one end of the lead screw (5) is connected with the driving end of the detection motor (4) and the other end is cantilevered towards the center of the rotating disc (2) and parallel to the sliding rail (6), the upper end of the first sliding block (9) and the second sliding block (10) is provided with a sliding groove and is slidingly connected with the sliding rail (6), and the detection motor (4) drives the lead screw (5) to rotate to drive the first sealing plate (11) and the second sealing plate (12) to translate towards the inner and outer sides of the detection box (13) respectively; The detection box (13) comprises a bottom plate (17), a left side plate (18), a right side plate (19), a top plate (20), and a partition plate (21) arranged between the left side plate (18) and the right side plate (19), the bottom plate (17), the left side plate (18), the right side plate (19) and the top plate (20) form a rectangular frame structure, and the partition plate (21) is fixed horizontally between the left side plate (18) and the right side plate (19); The rejection mechanism comprises a rejection support (25) arranged on the frame (1) and located in the middle of the upper end of the rotating disc (2), a rejection motor (26) and a smoke adding bin (24) arranged on the rejection support (25), a fixing seat (27) arranged on the rejection support (25), a sliding rod (28) slidingly arranged on the fixing seat (27), a smoke pushing block (29) arranged on one end of the sliding rod (28), and a crank connecting rod (30) connected between the other end of the sliding rod (28) and the driving end of the rejection motor (26). The push smoke port and the smoke outlet are horizontally arranged on the inner and outer sides of the bottom of the smoke adding bin (24), the smoke outlet corresponds to the inner opening of the detection box (13), the push smoke block (29) corresponds to the push smoke port, the rejection motor (26) drives the sliding rod (28) to translate on the fixed seat (27) towards the inner side of the detection box (13) through the crank connecting rod (30), and the sliding rod (28) drives the push smoke seat to translate towards the push smoke port of the smoke adding bin (24).

2. The system according to claim 1, wherein: The detection support (3) comprises an outer vertical plate (14) fixed on the rack (1) and located beside the rotating disc (2), a horizontal plate (15) fixed on the inner side of the outer vertical plate (14) and suspended towards the center of the rotating disc (2), and an inner vertical plate (16) arranged at the inner end of the horizontal plate (15) and corresponding to the outer vertical plate (14), wherein the inner end of the lead screw (5) is rotatably arranged on the inner vertical plate (16), and the sliding rail (6) is fixed on the lower end of the horizontal plate (15) and located between the outer vertical plate (14) and the inner vertical plate (16).

3. The system according to claim 1, wherein: The upper end of the partition plate (21) and the upper end of the bottom plate (17) are provided with long grooves (22) facing inward and outward.

4. The system according to claim 1, wherein: The upper end surface of the partition plate (21) towards the two ends is provided with an inclined surface (23).

5. The system according to claim 1, wherein: The rejection support (25) is provided with a smoke blocking mechanism on one side, the smoke blocking mechanism comprises a smoke blocking support (31) fixed at one end of the rejection support (25) and a smoke blocking plate (32) arranged on the smoke blocking support (31), the outer end of the smoke blocking support (31) is suspended towards the detection box (13), and the smoke blocking plate (32) is fixed on the suspended end of the smoke blocking support (31) and corresponds to the inner opening of the detection box (13).

6. The system according to claim 1, wherein: The smoke adding bin (24) is a rectangular cavity structure arranged in a long strip shape and vertically.

7. The system according to claim 1, wherein: The rejection mechanism further comprises a smoke guiding mechanism located on the outer side of the detection box (13) and corresponding to the push smoke block (29), the smoke guiding mechanism comprises a support plate (33) fixed on the rack (1), a smoke discharging port (34) arranged on the support plate (33), an upper support spring plate (35) and a lower support spring plate (36) respectively arranged on the upper end and the lower end of the smoke discharging port (34), an upper smoke discharging roller (37) rotatably arranged on the upper support spring plate (35) and located on the upper side of the smoke discharging port (34), and a lower smoke discharging roller (38) rotatably arranged on the lower support spring plate (36) and located on the lower side of the smoke discharging port (34), the size of the smoke discharging port (34) is greater than the outer opening of the detection box (13), and the distance between the upper smoke discharging roller (37) and the lower smoke discharging roller (38) is less than the height of the outer opening of the detection box (13).

8. The system of claim 1, wherein: The detection system further comprises an industrial computer, a PLC controller and a touch display module electrically connected with the industrial computer, a laser sensor, a negative pressure detection sensor, a gas path opening and closing electromagnetic valve, a gas supply module, a detection control module and a rejection control module electrically connected with the PLC controller. The first sealing plate (11) or the second sealing plate (12) is provided with a detection port and a gas supply port, the laser sensor is installed on one side of the detection support (3) and corresponds to the detection box (13) downward, used for detecting whether the detection box (13) is in place, the negative pressure detection sensor is installed on the rack (1) and the detection end is connected with the monitoring hole on the first sealing plate (11) or the second sealing plate (12), used for collecting the air pressure data in the detection box (13), the gas supply module is connected with the gas supply port through the gas supply pipeline, the gas path opening and closing electromagnetic valve is installed on the gas supply pipeline and used for opening and closing the gas supply pipeline, the detection control module is used for controlling the opening and closing of the detection motor (4), and the rejection control module is used for controlling the opening and closing of the rejection motor (26).

9. A detection method based on the online detection system of the gas tightness of a cigarette package according to any one of claims 1-8, characterized in that: The method comprises the following steps, S1, after the cigarette package is transported into the detection box (13), the detection box (13) is sealed; S2, negative pressure gas is introduced into the detection box (13) through the gas source; S3, the real-time air pressure in the detection box (13) is collected through the negative pressure sensor; S4, whether the transparent paper package of the cigarette package in the current detection box (13) leaks is judged through the collected air pressure change curve, when the air pressure changes rapidly after fluctuation and reaches the maximum value and remains stable, it is judged that the transparent paper of the cigarette package is not damaged, when the air pressure changes slowly and cannot reach the maximum value after fluctuation, it is judged that the transparent paper of the current cigarette package is damaged.

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