CN203837654U - Soft medium edge detection device - Google Patents

Abstract

The utility model relates to a soft medium edge detection device. The top of the opaque black box in the utility model is an inclined plane at an angle of α with the horizontal plane, and there is a round hole in the middle part close to the bottom of the inclined plane; there is a rectangular gap in the central part of the bottom edge of the front and rear sides of the black box, so that the medium to be measured can pass through Detection device; a strip-shaped wear-resistant fixing ring is fixed in the middle of the front and back of the black box base, and there is a round hole in the middle of the fixing frame. tension, the light source system is located below the center of the top of the slope. The utility model has high detection precision and is free from the interference of the surface, color, external light and dirt of the object to be measured.

Description

A soft medium edge detection device

technical field

The utility model provides an edge detection device for soft media, which is mainly used in the field of cutting soft media.

Background technique

At present, in the field of industrial control, it is necessary to detect the edge position of soft media (such as film, cloth, paper, etc.) in many cases to ensure that the media moves along the correct track. Edge detection is mainly to accurately measure the shape and size of objects. The previously disclosed edge detector is shown in FIG. 1 . The edge detector includes a light-tight black box 101 , a light source generating module 102 , a gap 105 parallel to the bottom and top of the black box, a linear CCD sensor 106 and a control circuit 107 . The light source generating module includes a light source 103 and an optical convex lens 104 , and the control circuit 107 directly supplies power to the light source 103 and generates parallel light for projection through the optical convex lens 104 .

The medium to be measured passes through the edge detection device from the gap 105, and the real image obtained under the irradiation of parallel light is mapped to the photosensitive area of the linear CCD sensor 106. The sensor outputs the electrical signal of each pixel through the conversion between photoelectricity and control. The circuit processes the voltage signal to obtain the position data of the edge of the medium.

In the power generation circuit, the control circuit directly supplies power to the light source. Once the voltage of the edge detection device fluctuates due to external influences, the current that supplies power to the light source will also fluctuate accordingly. Under the same environment, the light energy received by the linear CCD sensor will also change. It is different; when the external light enters the edge detector from the gap 105 of the black box, it will also interfere with the original light, which will affect the detection accuracy of the linear CCD sensor. Due to the above-mentioned various error factors, the image processing circuit using a fixed threshold will obviously increase the data error. These factors will lead to large errors or even wrong results in the final measurement data.

Contents of the invention

The purpose of this utility model is to provide a soft medium edge detection device to overcome the shortcomings of external light source interference, dirt contamination, poor detection accuracy, etc., and is not limited by the shape of the object to be measured and the detection environment.

In order to achieve the above object, the utility model is realized through the following technical solutions:

The utility model includes a light-tight black box, an image acquisition system and a light source system. The top of the light-tight black box is an inclined plane forming an angle α with the horizontal plane, and there is a round hole in the middle part near the bottom of the inclined plane; it is used for installing the image acquisition system. The optical lens in the black box, the inner four walls of the black box are black frosted layers, which reduce the impact of reflected light on the measurement accuracy; there is a rectangular gap in the center of the bottom edge of the front and rear sides of the black box, so that the medium to be measured can pass through the detection device; the front and back middle of the black box base Each fixes a strip-shaped wear-resistant fixing ring. There is a round hole in the middle of the fixing frame. The medium to be measured passes through the hole into the rectangular opening of the black box, and ensures that when the medium to be measured passes through the detection device at a constant speed, a stable tension is maintained. The light source The system is located under the center of the top of the ramp.

The utility model provides an edge detection device which has high detection precision and is not interfered by the surface, color, external light and dirt of the object to be measured. The camera system is used to collect the width data of the edge portion of the cut film to determine the position of the edge of the film relative to the edge of the cutter.

Description of drawings

FIG. 1 is a structural block diagram of an edge detection device in an embodiment of a conventional utility model.

Fig. 2 is a left view of the structure of the edge detection device in the embodiment of the utility model.

Fig. 3 is a front view of part of the structure of the edge detection device in the embodiment of the present invention.

Fig. 4 is a schematic diagram of soft medium cutting in the embodiment of the present invention.

Fig. 5 is a schematic diagram of the structure of the LED light source in the embodiment of the utility model.

Explanation of symbols in the figure:

101: Opaque black box, 102: Light source generating module, 103: Light source, 104: Optical convex lens, 105: Notch, 106: Linear CCD sensor, 107: Control circuit, 201: Image acquisition system shell, 202: Signal processing module, 203: Sensor driver module, 204: Linear CCD sensor, 205: Optical lens, 206: Opaque black box, 207: Light source system shell, 208: Light source driver module, 209: LED light source, 210: Medium fixing ring, 211: Notch , 31: rectangular notch, 32: round hole, 41: soft medium, 42: tool, 43: medium to be tested, 51: light emitting diode, 52: diffuser plate.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

In the embodiment of the present utility model, the wide soft medium is divided into multiple narrow mediums by a cutter, and a piece of medium at the edge of the division (that is, the medium to be tested) enters the round holes of the fixed frames on the front and rear sides of the edge detection device and the bottom of the The gap passes through the inside of the black box, and the line array image sensor detects the width of the medium to be tested, so as to determine the relative position of the cut slice and the edge of the soft medium.

The left view of the internal structure of the edge detection device of the embodiment of the utility model is shown in Figure 2, and the front view (partial structure) is shown in Figure 3. The edge detection device includes: an image acquisition system, a light source system 207 and a light-tight black box 206. The upper bottom surface of the opaque black box is an inclined plane at an angle α with the horizontal plane, and there are respectively a rectangular gap 31 in the middle part near the bottom of the front and rear sides of the black box, and a strip of medium is fixed on the base below the two gaps 211 As shown in Figure 3, the fixing ring 210 has a circular hole 32 in the middle, and black matte layers are attached to the four walls and the bottom inside the black box. As shown in Figure 4, after the soft medium 41 is divided by the cutter 42, the divided edge medium 43 is penetrated from the round hole of the fixed ring in front of the detection device into the rectangular opening at the bottom of the black box, and then passed through the rectangular opening on the other side. It is pierced through the round hole in the fixing ring to ensure that the medium to be measured has a stable tension during the detection process, and the detection position is relatively fixed, thereby reducing the error in the measurement process.

The light source system 207 includes: a light source driving module 208 and an LED light source 209. Wherein the LED light source is made of a cuboid, as shown in Figure 5, the light source in this embodiment is made up of a plurality of light-emitting diodes 51, and is arranged in a word on the top of the cuboid, and at the same time, a diffuser plate 52 is embedded in the bottom surface opposite to the light-emitting diodes to ensure Uniformity and parallelism of light. Before fixing the LED light source, the height of both ends of the LED light source should be adjusted so that it is placed obliquely, and the angle between it and the horizontal plane is β, so as to ensure that the incident angle formed by the light emitted by the light source system and the bottom surface of the black box is α. In order to ensure the accuracy of detection during the detection process, the light intensity of the light source must be kept stable, so a light source driver module is designed to provide a constant and adjustable current for the light emitting diode.

The image acquisition system is composed of an optical lens 205 , a linear CCD sensor 204 , a sensor drive module 203 , a signal processing module 202 and an image acquisition system housing 201 . The optical lens and the image acquisition system housing are combined and embedded in the middle and lower side of the top slope of the black box, and the optical lens and linear CCD sensor must be parallel to the slope. The sensor drive module provides the linear CCD sensor module with working voltage and appropriate driving pulse signal to ensure normal and stable operation. The linear CCD sensor module and the sensor driving module are coupled to the signal processing module. The parallel light emitted by the light source system shines on the surface of the medium to be tested and the surrounding black area, and the reflected light enters the optical lens. The grating and focal length of the optical lens can be adjusted according to actual needs, so that the contrast of the light entering the linear CCD sensor can be optimized. After passing through the optical lens, an enlarged real image can be obtained and presented on the linear CCD sensor. Using the optical lens can not only adjust the exposure intensity according to the environment, but also improve the contrast, so that the linear CCD sensor can collect a clear and enlarged image. Under the action of the sensor drive module, the linear CCD sensor converts the amplified real image from the optical signal into the corresponding analog voltage signal and outputs it.

Claims (1)

1. a soft medium edge pick-up unit, comprise light tight black box, image capturing system and light-source system, it is characterized in that: described light tight black box top is to become the inclined-plane at α angle with surface level having a circular hole at the center section near bottom, inclined-plane; For the optical lens of image capturing system is installed, the inner wall of black box is black frosted layer, reduces the impact of reflection ray on measuring accuracy; Before and after black box, base, two sides middle body respectively has a rectangle gap, so that testing medium is through pick-up unit; Each fixes a wear-resisting set collar of strip centre position, black box base front and back, in the middle of fixed frame, there is circular hole, testing medium from then on hole pierces into black box rectangle gap, and guarantee that testing medium is at the uniform velocity when the pick-up unit, keep stable tensile force, described light-source system is positioned at beveled top end central authorities below.