| Due to improvement of people's living, people want the comfort of clothes, then viscose filament is becoming popular because of its hygroscopicity,air permeability, the market demand for high-quality viscose filament is also rising. Our products of the viscose filament are restricted in the international market because of its instability the quality, their quality cannot meet the international quality standard, and one of the important reasons is that the dyeing of cloth isn't even. And for the present we count viscose filament by manual work, because it is affected by human factors, it is too ineffective and low-accuracy to detect fast. The overseas companies use special microscope to observe the filament, it is also ineffective.According to the problem and the present status of the manual counting of the viscose filament, we developed a automatic-counting system for viscose filament. The automatic-counting system of viscose filament detects the filament using the method of the photoelectrical imaging, then processes the images with the software, and counts the viscose filament. The system includes the photoelectrical imaging system,the electronical control system and the image analyzing and counting system. The thesis mainly introduces the system hardware design , the hardware consists of the imaging system and the electronical control system.The photoelectrical imaging system consists of the light sources,lens,CCD image sensors and image acquisition adapter, it completes the imaging and acquisition to store,display the images and count the filament. Because the filament is white and semitransparent and there are gray images, we choose SONY 1/3"black/white CCD as the image sensor. Every time there are 20～60 filaments to be detected, charging these filaments with a 20KV static charge, they are dispersed to increase the counting accuracy. There are 30mm that the filaments cover, object distance is about 40mm, we divide the field into two parts to decrease the lens cost and the system complexity, and the imaging field is only 15mm, then count filaments with the two images. The focal length is about 12mm, the field of view is 15mm, and the lens is optimized with Zemax. According to the requirement, 12W annular fluorescent lamp is chosen as the system light sources.The electronical control system is mainly used to control the camera and communicate with the PC. It consists of PC,MCU,step motor,power interface;MCU is the core of the system, we choose 51family MCU, which is high-integrated,simple-fabric,reliable.In the system, we chose mixed step motor, the step angle is 1.8°, the detent torque is 2500g·cm, it takes half-step. The MCU generates the control pulse for the motor, drive the step motor with power interface, and optoelectronic coupling is used to determine the initial position; when the motor is driven to the position, MCU communicates with PC by RS-232C serial interface, at the time the PC can have the acquisition and processing of the images. The logic voltage of MCU is different from RS-232C interface, MAX232 is chosen as the voltage converter. The system prototype was completed, its images quality meets the specification, and the imaging method was proven to be right. The prototype was delivered to the chemic-fiber company, it makes workers much more efficient. |
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