1 Introduction With the continuous improvement and update of medical level and medical equipment, disposable needles are favored by users because of their convenience and hygienic characteristics, and their demand is also rapidly increasing, and the appearance of needles directly affects one-time injection. The quality of the needle. Therefore, in order to reduce the number of non-conforming products, it is necessary to increase the inspection process. Manual visual inspection and product marking are expensive and unreliable. At the same time, it means a monotonous work that is not close to human feelings. Here, automated machine vision systems provide solutions to these problems. 2, the defect of a disposable injection needle The disposable needle can be divided into two parts, a needle seat and a needle. The defect of the needle seat can not affect the quality of the product. There are two kinds of defects in the needle: first, the needle may have burrs in the needle tip during the manufacturing process; secondly, the needle may be inverted during the automatic assembly process (the needle tip is inserted into the needle seat). Several defects affecting the needle are: needle tip burr, inverted insertion. Inverted insertion will not only have a direct impact on the quality of the product, but also seriously endanger human life. Figure 1: 3, using machine vision to achieve automatic detection of the appearance defects of PET beverage bottles With the increasing demand for disposable injection needles in the market and the requirements of customers for product quality, more and more medical device manufacturers use automated injection needle detection systems to comprehensively detect the appearance defects of disposable injection needles. This method replaces the traditional manual method to improve production efficiency and product quality, and solves the false detection and missed detection caused by uncertain factors such as low efficiency, slow speed of the manual method and subjective constraints of the test personnel. 100% product online testing. 3.1 Overview of Machine Vision System The machine vision system refers to capturing an image through an image capturing device (both CMOS camera and CCD camera), and then transmitting the image to a processing unit, and performing digital processing according to pixel distribution, brightness, color, and the like. Discrimination of size, shape, color, etc. Further, based on the result of the discrimination, the device operation at the site is controlled. 3.2 Machine vision to achieve automatic detection of defects in the appearance of disposable injection needles In this paper, the injection needle detection system is used for the detection of appearance defects of disposable injection needles. The system is based on the Siemens image processor [3] and combined with Siemens automation equipment to form a system with a simple digital signal interface and a complex industrial network interface, allowing users to choose the system that suits their working conditions. Convenient and save investment. The basic detection processing flow is shown in Figure 2. The simple system framework is shown in Figure 3: Working principle: Firstly, the fiber optic sensor senses the injection needle, then triggers the image processor to take a picture, performs image analysis processing, and finally drives the rejection device. Taking into account the current automated production needs, the current rejection method uses a whole row of rejection, if you need a higher level of automation, you can add a suction cup for each needle holder. 3.3 Introduction to the function of the needle visual inspection system 1. The existence detection, model comparison, shape inspection, position and direction identification, and workpiece measurement of the object can be completed online. 2. The current actual detection speed of the system reaches 600-1500/min, and the regulator can adjust the speed of the detection conveyor according to the on-site production needs. 3, can accurately eliminate the detected defective products through the rejection device. 4, can achieve the following statistical functions and display on the touch screen on the spot (installation of the printer can be printed): the number and proportion of non-conforming products when the unit product passes, the number and proportion of non-conforming products passing the product per unit time, the production of each shift The total amount of products and the number of defective products detected, the total amount of products produced per month, and the number of defective products detected. 5. It can store the testing procedures of various products on the production line and can be easily selected through the on-site touch screen. 6, through the Ethernet interface and computer communication, online monitoring, online modification detection procedures, online recording of production data, online storage of real-time images required by users (images of qualified products and images of non-conforming products). 7. The height of the visual inspection device can be conveniently adjusted according to different products required for testing on the production line. 8. The machine vision inspection system is an independent system, which can be easily accessed or withdrawn. The various hardware and software required by the manufacturer are provided by the manufacturer. 9. The machine vision inspection system is easy to install, maintain and disassemble. 4 Conclusion The system has been successfully applied to the production line of a well-known medical device company in China, and the effect is very good. Not only meets the user's existing needs, but also reserves a lot of functions and upgrade space for users. These functions will play more roles in future detection tasks, solve more problems for users, and save a lot of upgrade costs. . Such as: print interface, host computer communication interface, alarm interface, needle glitch detection function, speed-up function. More importantly, the system can strictly control the quality of user products and reduce a lot of labor costs. With the continuous improvement of industrial automation level and the increase of labor costs, the application prospect of this system will be more extensive.
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