KR100504335B1 - METHOD FOR INSPECTING A BADNESS Of TIRE CORD - Google Patents

Abstract

The present invention relates to a method for inspecting whether a tire cord is inclined badly. According to the present invention, there is an effect that it is possible to easily detect the inclination gap, the foreign matter mixing defect, the inclination disconnection defect.

Description

Tire code inspection method {METHOD FOR INSPECTING A BADNESS Of TIRE CORD}

The present invention relates to a method for inspecting a defect of a tire cord, and more particularly, to a method for inspecting a defect such as foreign matter incorporation into a tire cord, a slope break, and a gap between slopes.

A tire cord is a fabric that enters the inside of a tire and consists of a warp yarn of longitudinal thick yarn and a weft yarn of transverse thin yarn. The warp yarns function as a reinforcement of the tire and have high strength and low shrinkage. The weft warp yarns function to maintain the arrangement of the warp yarns during post-processing and forming.

Before the tire cords are provided into the tires, checks should be made for the presence of foreign matter, gaps between the slopes, and the presence of cut slopes. Conventionally, the worker directly checks for defects while checking with the naked eye, but the work takes a long time, there is a problem that the work efficiency is lowered for a long time, the reliability is greatly reduced in the inspection.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tire cord inspection method, in which a defect inspection of a tire cord can be performed quickly and accurately.

In order to achieve the above object, the present invention tire cord inspection method is provided with a camera, the step of moving the tire cord in front of the camera, by taking a picture of the tire cord at a predetermined time interval by the camera code Transmitting an image to an analysis unit, the analysis unit acquiring data on the inclination of the code images, the analysis unit detecting a reference image among the code images, and the reference image from each inclination reference point of the reference image Thereafter, tracing is performed as a reference point of the corresponding slopes in the code image transmitted to the analyzer, and analyzing whether the tire cord is defective.

According to another example of the present invention, a tire cord inspection method includes providing a camera, moving a tire cord in front of the camera, photographing the tire cord at a predetermined time interval by the camera and photographing a code image Transmitting a plurality of code images photographed by the compression unit into one code image, and transmitting the code image having a predetermined density or less from the compressed code image to the analysis unit after transmitting the compressed image to the compression unit; Acquiring data of the inclination of the code images by the analyzing unit, detecting the reference image from the data by the analyzing unit, and code images transmitted to the analysis unit after the reference image from a reference point of the inclinations of the reference image Tracing to the reference point of the corresponding inclination in the step, And analyzing whether the tire cord is defective.

Preferably, the reference image is set by setting the image as a reference image when the width of each slope of the coded image transmitted to the analyzer and the interval between adjacent slopes are included within the reference value.

The bad inspection object of the tire cord includes a gap defect between the inclinations, and the gap detection method includes comparing whether the distance between reference points of the inclinations transmitted to the analyzer falls within a reference value.

In addition, the defective inspection target of the tire cord includes a foreign matter mixing defect in which foreign matter is present in the tire cord, and the detection method of the foreign substance mixing defect is from the inclination reference position of the code image transmitted to the analysis unit to the analysis unit later. And analyzing whether the reference positions of the predetermined number of tilts or more are traced to the same position when tracing is performed to the tilt reference positions of the transmitted code image, and when the foreign matter mixing defect is detected, the foreign substances are mixed. The virtual tracing is performed in a straight line, and the tracing is performed between the inclination of the image before the foreign matter mixing and the inclination after the foreign matter mixing.

In addition, the bad inspection object of the tire cord includes the inclination disconnection failure that the inclination is broken, the detection method of the inclination disconnection failure of the image transmitted to the analysis unit later from the inclination reference position of the image transmitted to the analysis unit. When tracing to the inclination reference position, the step of analyzing whether there is an inclination that is not traced, and if the inclination disconnection detection is detected, the center between the inclination is located on both sides of the disconnected inclination Virtual tracing is performed along the position, tracing is performed between the slope before the break and the slope after the break.

Hereinafter, embodiments of the present invention will be described in more detail with reference to FIGS. 1 to 7. The embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited by the embodiments described below. This embodiment is provided to more completely explain the present invention to those skilled in the art. Therefore, the shape of the elements in the drawings are exaggerated to emphasize a clearer description.

1 is a view schematically showing a tire code inspection device of the present invention. The tire cord inspection apparatus has a camera 100, a tire cord transfer part 200, and a controller 300.

The tire cord feeder 200 is a portion for moving the tire cord 10 and has a plurality of rollers 220 and a motor 240 for rotating the rollers 220. The tire cord 10 is placed on the upper end of the rollers 220, and moves in one direction as the roller 220 is rotated by the motor. The tire cord 10 is preferably moved at the same speed.

The one-dimensional camera 100 is disposed at a predetermined position of the movement path of the tire cord 10. The camera 100 photographs the tire cord 10 passing through the front end of the camera 100 continuously at regular time intervals. For example, the camera 100 may adjust the photographing speed to photograph the tire cord 10 at intervals of about 1 mm. The position of the camera 100, the arrangement position of the rollers 200, and the moving direction of the tire cord 10 may be variously changed.

The code images photographed by the camera 100 are transmitted to the controller 300, and the controller 300 analyzes whether the tire cord 10 is defective from these code images.

The tire cord 10 consists of a warp yarn 12 made of a thick thread in the longitudinal direction and a weft yarn 14 made of a thin thread in the transverse direction. The apparatus checks whether the inclination 12 is defective in the tire cord 10. The bad inspection items of the tire cord 10 include a slope gap defect, a foreign substance mixing defect, and a slope break defect, and the gap defect refers to a case where the distance between adjacent slopes is larger than the reference value, and the foreign substance mixing defect Refers to a case in which foreign matter is attached to the tire cord 10, and a disconnection failure means that some of the slopes 12 are broken.

The controller 300 receives the code images photographed from the camera 100, and has an analysis unit 320 and a data unit 340 as a part for detecting various defects of the tire code 10 from these code images.

Code images photographed by the camera 100 are sent to the analyzer 320. The analyzer 320 sets a reference image from the code images and analyzes whether or not a defect exists in the tire cord 10. Among the code images, the image in which the slopes are preferably arranged is set as the reference image, which is set based on the width of each slope in the code image and the distance between the slopes. For example, when the code image photographed by the camera 100 is transmitted to the analyzer 320, the analyzer 320 measures the width and the distance between the inclinations of each of the inclinations in the image, and if they are included within the reference value, Set to video. However, if they deviate from the reference value, the analyzer 320 measures the code image transmitted next time. When the reference image is set, the reference position of each of the tilts in the reference image is input to the data portion. Here, the reference position uses the center position of the slopes.

The analyzer 320 traces from the center of each of the tilts in the reference image to the center of each of the tilts which are located below the vertical of the images photographed afterwards. The tracing process can be shown through a display (not shown) for the operator to see.

FIG. 2A illustrates a tire code in a state in which gaps between the inclinations 12 are generated, and FIG. 2B sequentially shows code images 20: 20a, 20b, and 20c transmitted to an analyzer by a camera. 2C is a diagram illustrating a state where tracing is performed along a center position of corresponding slopes 22 in each code image 20. If the slopes 12 are arranged in a straight line, the slopes 22b in the code images 20 should be located below the vertical of the corresponding slopes 22a at equal intervals. However, in general, since the inclinations 12 are not arranged straight, the center positions of the corresponding inclinations 22a and 22b in the code images 20 are different as shown in FIG. 2B. Thus, when tracing is made along the center positions of these corresponding inclinations 22a and 22b, the tracing is not straight, but is skewed left or right as shown in FIG. 2C. In the code image 20a initially sent to the analysis unit 320, the centers between the slopes 22a are continuously measured, and the distances between the centers between the slopes 22a are respectively calculated. The analysis unit 320 compares whether the distance between these centers is longer than the reference value. As a result of the comparison, if the distance between the centers is shorter than the reference value, the next code image 20b is continuously inspected. If the distance between the centers is longer than the reference value, it is determined that there is a gap gap and stored in the data unit 260 and the next code image is continuously examined. The reference value may be arbitrarily input or input based on the distance between the inclinations in the reference image.

3A is a view showing a state in which the foreign matter 30 is mixed in the tire cord 10, FIG. 3B shows some of the code images 20 transmitted by the camera 100, and FIG. 3C shows a foreign matter incorporation portion. Figure 2 shows the process of virtually tracing. In the code images 20: 20c, 20d, 20e, 20f, and 20g transmitted to the analyzer 320, tracing is performed along the centers of the corresponding slopes 22a. However, when the foreign material 30 is mixed in the tire cord 10 as shown in FIG. 3A, as shown in FIG. 3B, the foreign material 30 is included in some code images 20d, 20e, and 20f at some inclination positions. Video is sent. When tracing is performed, the analysis unit 320 determines that a foreign matter mixing defect is generated when more than a predetermined number of inclinations are traced to the same position, and stores it in the data unit 360. If the slopes are wide and adjacent slopes come into contact with each other, there may be a case where two slopes are later traced to the same position, so that only when a sufficient number of slopes are traced to the same position, foreign matter mixing defect Analyze with When the foreign matter mixing defect occurs, the analyzer 320 virtually traces from the tilts in the code image 20c photographed before the foreign matter mixing defect occurs to each of the tilts of the image photographed after the foreign matter mixing. As shown in FIG. 3C, the virtual tracing may be performed by tracing in a straight line vertically down from the center of each inclination immediately before the foreign matter mixing defect occurs. In FIG. 3C, the solid line shows tracing between the slopes 22 in each code image, and the dotted line shows tracing virtually at the foreign matter incorporation portion.

4A is a view showing a state where the inclination break of the tire cord 10 is generated, FIG. 4B is a view showing some of the code images 20 transmitted by the camera 100 at the time of inclination break, FIG. 4C is a view of inclination A diagram showing a process of virtually tracing where a disconnection occurs. The tracing is performed along the centers of the corresponding slopes in the code images transmitted to the analyzer 320. As shown in FIG. 4B, if one of the slopes 22 'is broken, no tracing is subsequently made from the broken slope. In this case, the analysis unit 320 determines that the inclination break has occurred, and transmits it to the data unit 340. The tracing from the broken slope 22 'then proceeds virtually. For example, virtual tracing can be made along the center position between the slopes that are normally traced on both sides of the disconnected slope as shown in FIG. 4C.

Generally, the overall width of the tire cord 10 is approximately 1400 mm to 1500 mm, with about 1500 slopes 12 therebetween. For each of these inclinations, the camera is continuously photographed at intervals of about 1 mm in the longitudinal direction, and as described above, the inspection is performed on various defects, so that a very long time may be required. There is also a weft yarn 14 in the direction perpendicular to the warp yarns to maintain the arrangement of the warp yarns 12. In order to limit the inspection object to the warp yarns 12, it is necessary to remove the weft yarns from the code image. To this end, the controller 300 may have a compression unit 360 that compresses a predetermined number of code images into one image before the code image photographed by the camera 100 is transmitted to the analyzer 320. For example, one compressed tilted image 20 'may be made by overlapping four tilted images 20a, 20b, 20c, and 20d into one image. When four tilted images are superimposed, the areas where the tilts are dense appear thicker, and the overlapping parts of the tilted parts appear blurry. The compressed tilted image is made by deleting a portion below a certain density in the overlapped image. FIG. 5A is an image of tilts continuously photographed by a camera, and FIG. 5B shows these tilted images superimposed on one, and FIG. 5C shows a compressed tilted image in which blurry portions of the tilted superimposed images are deleted. Referring to FIG. 6a showing the code images before compression and FIG. 6b showing the compressed code images, the compressed code image is very short in length compared to the code images before compression. You can see that is not visible. Images compressed by the compression unit are transmitted to the analysis unit, and the analysis unit performs the same defect inspection as described above with the compressed image.

Next, referring to FIG. 7, a failure inspection method of a tire cord will be described sequentially. First, the camera 100 is provided, and the tire cord 10 is moved in front of the camera 100 (steps S11 and S12). The camera 100 photographs the tire cord 10 at predetermined time intervals, and transmits the photographed code image 20 to the compression unit 360 (step S13). A plurality of predetermined numbers of images transmitted to the compression unit 360 are compressed to overlap one image (step S14). Thereafter, the compression unit 360 deletes an image having a predetermined concentration or less from the compressed image, and then transmits the compressed image to the analysis unit 320 (step S15). The analyzer 320 acquires data on the width of each slope or the distance between the slopes in the compressed images (step S16). From these data, the analysis unit 320 sets the reference image if the width of the slopes and the distance between the slopes are within the reference value, and sets the width of each of the slopes, the distance between the slopes, the center position of each slope, etc. in the reference image. The data is transferred to the data portion (step S17). The analysis unit 320 traces from the center position of each inclination in the reference image to the center position of each inclination in the compressed image transmitted later to the analysis unit (step S18). The analyzing unit 320 determines whether the distance between the centers of the inclinations of the respective code images from the tracing data or the measured data is out of a preset range, whether the plurality of the inclinations are traced to the same position, and not being traced. It is analyzed whether the inclination exists, and it is determined whether the tire cord 10 is defective (step S19). In addition, when a plurality of inclinations are traced to the same position, or if there are inclinations that are not traced, the traces are virtually traced to a predetermined position, and a subsequent code image is continuously checked for defects (step S20).

According to the present invention, it is possible to automatically check whether the tire cord is defective, and this has the effect of making accurate and rapid inspection.

In addition, according to the present invention, since the virtual tracing is performed even after the inclination break or foreign matter is mixed, there is an effect that can continuously check whether the tire cord is defective.

1 shows schematically a device for testing a tire cord of the present invention;

2A is a view illustrating a state in which gaps between slopes are generated;

2b is a view showing sequentially the images transmitted to the analysis unit when the gap between the slopes;

FIG. 2C is a view showing a state where tracing is made to a center position of tilts in each image of FIG. 2B; FIG.

3A is a view illustrating a state in which foreign matter is mixed in a tire cord;

3b shows some of the code images transmitted by the camera;

3c is a view showing a process of virtually tracing in a foreign material mixing portion;

4A is a view showing a state in which a tire cord inclination break has occurred;

4B is a view showing some of the code images transmitted by the camera when the slope is broken;

4C is a view illustrating a process of virtually tracing in a portion where a slope break occurs;

5A shows an image of tilts taken continuously by a camera;

5B shows these tilted images superimposed on one;

5C is a view illustrating a compressed tilted image in which blurry portions of an overlapped tilted image are deleted;

6A and 6B show code images before compression and compressed code images, respectively; And

7 is a view sequentially showing a failure detection method of a tire cord.

Explanation of symbols on the main parts of the drawings

10: tire code 12: slope

14: weft 20: code video

100: camera 200: tire cord transfer unit

300: controller 320: analysis unit

340: data portion 360: compression portion

Claims (9)

In the method for inspecting the defect of the tire cord, Providing a camera; Moving the tire cord toward the front of the camera; Photographing the tire cord at a predetermined time interval by the camera and transmitting the photographed code image to an analysis unit; Acquiring, by the analyzer, data about the inclination of the code images; Detecting, by the analysis unit, a reference image among the code images; Tracing a reference point of corresponding tilts in a coded image transmitted to the analysis unit after the reference image from each tilting reference point of the reference image; And Tire cord inspection method comprising the step of analyzing whether the tire cord defective. In the method for inspecting the defect of the tire cord, Providing a camera; Moving the tire cord toward the front of the camera; Photographing the tire cord at a predetermined time interval by the camera and transmitting the photographed code image to a compression unit; Compressing the plurality of code images photographed by the compression unit into one code image; Transmitting, by the compression unit, a code image having a predetermined concentration or less from the compressed code image and transmitting the code image to the analysis unit; Acquiring, by the analyzer, data about the inclination of the code images; And Tire cord inspection method comprising the step of analyzing whether the tire cord defective. The method of claim 2, The tire cord inspection method, Before analyzing whether the tire cord is defective, The analyzing unit detecting a reference image among the code images; And tracing a reference point of corresponding inclinations in the code image transmitted to the analysis unit after the reference image from each inclination reference point of the reference image. The method according to claim 1 or 3, The setting of the reference image is performed by setting the image as a reference image when the width of each inclination of the code image transmitted to the analyzer and the interval between adjacent inclinations are included within a reference value. Way. The method according to claim 1 or 2, The bad inspection object of the tire cord includes a gap between the inclinations, The detection method of the gap defect, And comparing whether the distance between the reference points of the inclinations transmitted to the analysis unit falls within the reference value. The method according to claim 1 or 2, The defective inspection target of the tire cord includes a foreign matter mixing defect in which foreign matter is present in the tire cord. The detection method of the foreign matter mixing defect, Analyzing whether the reference positions of the predetermined number of tilts are traced to the same position when tracing is performed from the tilt reference position of the code image transmitted to the analysis unit to the tilt reference position of the code image transmitted to the analysis unit later. Tire cord inspection method comprising a. The method of claim 6, The tire cord inspection method, When the foreign matter mixing defect is detected, Wherein the foreign matter is mixed, the virtual tracing is made in a straight line, the tire cord inspection method further comprises the step of tracing between the inclination of the image before the incorporation of foreign matter and the inclination after the incorporation of foreign matter. The method according to claim 1 or 2, The bad inspection target of the tire cord includes a slope break failure that the slope is broken, The detection method of the inclination disconnection, When the tracing is made from the inclination reference position of the image transmitted to the analysis unit later to the inclination reference position of the image transmitted to the analysis unit, analyzing whether there is an inclination that is not traced. How to check code. The method of claim 8, The tire cord inspection method, When the slope break is detected, And a tracing is performed between the inclination before the disconnection and the inclination after the disconnection by performing a virtual tracing along the center positions between the inclinations located at both sides of the disconnected inclination.