Cigarette shape detector

Abstract

The utility model relates to the technical field of cigarette detection, in particular to a cigarette shape detector, which comprises a first delivery roller and a second delivery roller which are rotationally connected, a third delivery roller which is rotationally connected with the second delivery roller, and two first detection assemblies which are arranged on the side surfaces of the second delivery roller and the third delivery roller, a second detection assembly is mounted on the third conveying roller; light sources are additionally arranged on the two sides of the cigarette, lighting is conducted according to the tested angle, the cigarette with the loose end and the cigarette without the tip can be accurately detected, the appearance of the cigarette is detected through the area light source right facing the axial direction of the cigarette and the area-array camera, dependence on a sensor is removed, the cigarette shape detection device is more stable than the sensor, and then the false detection rate of the cigarette is reduced; the full-vision detection mode solves the problem that the numerical value induction of the sensor is not accurate, and economic loss caused by false detection of a large number of products is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of cigarette detection, in particular to a cigarette shape detector. Background Art

[0002] Currently, the appearance of cigarettes is detected through sensors. This detection method mainly relies on the sensing value of the sensor. The sensor receiving value is highly dependent on the environment. The normal production speed of a cigarette machine can reach 7,000 cigarettes per minute, 116 cigarettes per second. It only takes about 8ms for a single cigarette to pass through, which is very fast. During the detection process, the cigarette moves quickly, which will cause inaccurate sensor value sensing and a large number of false detections, resulting in direct economic losses.

[0003] For this purpose, the utility model proposes a cigarette shape detector. Utility Model Content

[0004] The utility model aims to provide a cigarette appearance detector in view of the deficiencies in the prior art, and aims to solve the problem of a large number of false detections during cigarette appearance detection.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A cigarette shape detector, comprising:

[0007] a first conveying roller, a second conveying roller rotatably connected to the first conveying roller, and a third conveying roller rotatably connected to the second conveying roller;

[0008] Two first openings facing each other are arranged at two cross-sectional outer edges of the second conveying roller at positions forming a predetermined angle with the cigarette, and the first openings are provided with first infrared light sources;

[0009] Two second openings facing each other are arranged at two cross-sectional outer edges of the third conveying roller at a position forming a predetermined angle with the cigarette, and the second openings are provided with a second infrared light source;

[0010] are respectively arranged on the circumferential side surface of the second transmission roller and face the first infrared light source,

[0011] The two first detection components facing the second infrared light source on the circumferential side of the third conveying roller include: a sealed detection box with a transparent cover plate on the side facing the cigarette, a white light source installed inside the detection box, and two cameras installed at a predetermined distance on the opposite side of the transparent cover plate, wherein the lens parts of the cameras are sealed and installed inside the detection box; and

[0012] The second detection component includes: a surface light source and a camera which are relatively installed on two cross sections of the third conveying roller and face the cigarette.

[0013] Furthermore, air outlet holes are evenly arranged at both ends of the transparent cover plate of the detection box, and the air outlet holes are connected to the air pressure device through the air inlet holes.

[0014] Furthermore, the predetermined angle is 10° to 20°.

[0015] Furthermore, the cameras are all area array cameras.

[0016] Furthermore, there are three white light sources inside the detection box, which are evenly distributed inside the box, and the two cameras and the white light sources are installed alternately.

[0017] Furthermore, the axes of the first conveying roller, the second conveying roller and the third conveying roller form an acute triangle.

[0018] Furthermore, the first detection component and the second detection component are communicatively connected to an external detection mainboard.

[0019] Beneficial effects of the utility model: The utility model is a cigarette shape detector based on full vision. By adding light sources on both sides of the cigarette and lighting at a tested angle, it can accurately detect cigarettes with loose heads and missing mouths. The shape of the cigarette is detected by a surface light source and a planar array camera facing the axial direction of the cigarette, eliminating the dependence on the sensor, which is more stable than the sensor, thereby reducing the false detection rate of cigarettes; the full vision detection method solves the problem of inaccurate sensor numerical sensing and avoids economic losses caused by false detection of a large number of products. The imaging results of the machine vision itself are stable, and the data can be queried with images. It can be intuitively judged whether the current cigarette has defects through the stored defective images. The visual detection method is more digital, detailed and specific than the sensor detection method for cigarette quality detection. In addition, the detection of loose heads and missing mouths and the appearance detection share the same camera, and only a light source needs to be added separately. The image is captured once, and there is no need to capture the image separately, which can improve economic benefits and detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the cigarette shape detector proposed by the utility model.

[0021] Figure 2 This is a schematic diagram of the first detection component of the cigarette shape detector proposed in the utility model.

[0022] Figure 3 This is a side view of the cigarette shape detector proposed by the utility model.

[0023] Reference numerals include:

[0024] 1—first detection component, 12—transparent cover plate, 13—white light source, 14—air outlet, 15—air inlet;

[0025] 2—first conveyor roller;

[0026] 3—second conveyor roller;

[0027] 4—the third conveying roller;

[0028] 5—second detection component;

[0029] 6—Infrared irradiation lamp. DETAILED DESCRIPTION

[0030] The utility model is described in detail below with reference to the accompanying drawings.

[0031] like Figure 1 — Figure 3 As shown, the utility model provides a cigarette shape detector, comprising:

[0032] a first conveying roller 2, a second conveying roller 3 rotatably connected to the first conveying roller 2, and a third conveying roller 4 rotatably connected to the second conveying roller 3;

[0033] Two cross-sectional outer edges of the second conveying roller 3 are provided with two first openings facing each other at a position forming a predetermined angle with the cigarette, and the first openings are provided with a first infrared light source;

[0034] Two second openings facing each other are arranged at two outer edges of the two cross sections of the third conveying roller 4 at a position forming a predetermined angle with the cigarette, and the second openings are provided with a second infrared light source;

[0035] are respectively arranged on the circumferential side of the second conveying roller 3 facing the first infrared light source,

[0036] The two first detection components 1 facing the second infrared light source with the circumferential side of the third conveying roller 4 include: a sealed detection box with a transparent cover plate 12 disposed on the side facing the cigarette, a white light source installed inside the detection box, and two cameras installed at a predetermined distance on the opposite side of the transparent cover plate 12, wherein the lens parts of the cameras are sealed and installed inside the detection box; and

[0037] The second detection assembly 5 comprises: a surface light source and a camera which are installed relatively to two sections of the third conveying roller 4 and face the cigarette.

[0038] During the implementation of this solution, cigarettes are transported through three conveyor rollers, and detection devices are arranged on the second conveyor roller 3 and the third conveyor roller 4. A first detection component 1 is arranged on the side of the second detection roller, and a first detection component 1 and a second detection component 5 are arranged on the side of the third roller. The first detection component 1 integrates three detection items, namely, missing mouth, loose head, and appearance detection. On the side of the second roller, two high-frame rate and high-resolution area array cameras + three high-brightness white light LED light sources are used to image the appearance of the cigarette, with a resolution of 0.1mm / pixel. A small infrared irradiator 6 is installed on both sides of the cigarette, and lighting is performed at a predetermined angle through a small hole on the side of the cigarette to detect loose head and missing mouth. The area array camera and the white light LED lamp are installed in a sealed box, and a glass cover is used on the side of the sealed box facing the cigarette; the two first detection components 1 are respectively installed on the second and third rollers, thereby realizing The image of the outer surface of the cigarette at least 330° is acquired, and the imaging of loose ends and missing mouths of the cigarette is realized by oblique lighting. The second detection component 5 uses a high-frame rate and high-resolution area array camera + a high-brightness white light LED light source for imaging, with a resolution of 0.1mm / pixel. It is installed on the oblique lower side of the non-rotating axis of the third conveying roller 4, and then obtains the image of the cigarette shape to detect whether the outer packaging of the cigarette is wrinkled or uneven. It is a cigarette shape detector based on full vision. By adding light sources on both sides of the cigarette and lighting at a tested angle, it can accurately detect cigarettes with loose ends and missing mouths. The shape of the cigarette is detected by the area light source and the area array camera facing the axial direction of the cigarette, which eliminates the dependence on the sensor and is more stable than the sensor, thereby reducing the false detection rate of cigarettes. The full-vision detection method solves the problem of inaccurate sensor numerical sensing and avoids economic losses caused by false detection of a large number of products.

[0039] In one embodiment, air outlet holes 14 are evenly formed at both ends of the transparent cover plate 12 of the detection box, and the air outlet holes 14 are connected to the air pressure device through the air inlet holes 15 .

[0040] Specifically, the air holes are evenly installed on the sealed box wall on the upper side of the transparent cover plate 12, and the air pressure device blows air into the air holes to clean the transparent cover plate 12, thereby reducing the influence of droplets and dust on the detection result.

[0041] In one embodiment, the predetermined angle is 10° to 20°. Specifically, after many tests by R&D personnel, it was found that the best lighting angle is 15°. If the product is good and the filter or tobacco is not missing, the image taken by the camera will only produce highlights at the end. If the product is missing some tobacco or filters, the light source will illuminate the inner wall of the tipping paper or cigarette paper that wraps the tobacco and filters, which will produce highlights inside the cigarette. Through this imaging difference, it is very easy to detect whether the cigarette has defects such as loose ends or missing ends.

[0042] In one embodiment, the cameras are all area array cameras. Specifically, the area array cameras can capture a complete image, providing comprehensive visual information for cigarette appearance inspection. Since the image data within the entire field of view can be directly obtained, the area array camera can capture various details and features on the surface of the cigarette, thereby more accurately judging the appearance quality of the cigarette.

[0043] In one embodiment, there are three white light sources inside the detection box, which are evenly distributed inside the box, and the two cameras and the white light sources are installed alternately.

[0044] Specifically, three white light sources are respectively installed at the two ends and the middle of the transparent cover 12 of the detection box, and the camera is installed opposite the transparent cover 12. The gap between the white light sources and the lens are facing the cigarette, thereby achieving sufficient and uniform lighting, making the acquired image clearer.

[0045] In one embodiment, the axes of the first conveying roller 2, the second conveying roller 3 and the third conveying roller 4 form an acute triangle. Specifically, the three conveying rollers installed at the above angles have enough space for installing the detection component.

[0046] In one embodiment, the first detection component 1 and the second detection component 5 are communicatively connected to an external detection main board; the two first detection components 1 obtain images of the cigarette surface within a range of at least 330 degrees, and transmit the images to the detection main board to detect the outer surface, loose head, and missing mouth of the cigarette through a detection program; the second detection component 5 transmits the surface shape information of the cigarette to the detection main board, and detects the appearance of the cigarette through a detection program; thereby achieving quality inspection of the appearance of the cigarette.

[0047] In the present invention, the detection of loose tips and missing mouths adopts full-vision imaging. The cleverness of this design lies in that, after a large number of imaging experiments, we found that when the point laser is directly irradiated vertically on the parts of the cigarette that are missing filters, tobacco, etc., compared with the full-vision imaging method, the contrast between the missing and the non-missing parts captured by the camera is not very obvious. This imaging may cause a lot of false detections in formal use, resulting in a lot of economic losses.

[0048] When the laser is obliquely incident at an angle of 10-20° (15° is optimal), the incoming cigarette is missing the filter or tobacco. Due to the oblique incident, if the product is good and the filter or tobacco is not missing, the image captured by the camera will only produce highlights at the end. If the product is missing some tobacco or filter, the light source will illuminate the inner wall of the tipping paper or cigarette paper that wraps the tobacco and filter, which will produce highlights inside the cigarette. Through this imaging difference, the software can easily detect whether the cigarette has a loose tip or missing tip.

[0049] In summary, it can be seen that the utility model has the above-mentioned excellent characteristics, which can enhance the performance unprecedented in the prior art and become a product with great practical value.

[0050] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A cigarette shape detector, characterized in that: include: A first conveying roller (2), a second conveying roller (3) rotatably connected to the first conveying roller (2), and a third conveying roller (4) rotatably connected to the second conveying roller (3); Two first openings facing each other are arranged at two cross-sectional outer edges of the second conveying roller (3) at positions forming a predetermined angle with the cigarette, and the first openings are provided with a first infrared light source; Two second openings facing each other are arranged at two outer edges of the cross section of the third conveying roller (4) at a position forming a predetermined angle with the cigarette, and a second infrared light source is installed in the second openings; Two first detection components (1) are respectively arranged on the circumferential side of the second conveying roller (3) facing the first infrared light source, and on the circumferential side of the third conveying roller (4) facing the second infrared light source, comprising: a sealed detection box with a transparent cover plate (12) arranged on the side facing the cigarette, a white light source (13) installed inside the detection box, and two cameras installed at a predetermined distance on the opposite side of the transparent cover plate (12), wherein the lens parts of the cameras are sealed and installed inside the detection box; and The second detection component (5) comprises: a surface light source and a camera which are relatively installed on two cross sections of the third conveying roller (4) and face the cigarette.

2. The cigarette shape detector according to claim 1, characterized in that: Air outlet holes (14) are evenly arranged at both ends of the transparent cover plate (12) of the detection box, and the air outlet holes (14) are connected to the air pressure device through the air inlet holes (15).

3. The cigarette shape detector according to claim 1, characterized in that: The predetermined angle is 10° to 20°.

4. The cigarette shape detector according to claim 1, characterized in that: The cameras are all area array cameras.

5. The cigarette shape detector according to claim 1, characterized in that: There are three white light sources (13) inside the detection box, which are evenly distributed inside the box, and the two cameras and the white light sources (13) are installed alternately.

6. The cigarette shape detector according to claim 1, characterized in that: The axes of the first conveying roller, the second conveying roller (3) and the third conveying roller (4) form an acute triangle.

7. The cigarette shape detector according to claim 1, characterized in that: The first detection component (1) and the second detection component (5) are communicatively connected to an external detection mainboard.

Images