Principle of the hottest visual sensor

Principle of visual sensor

why will visual sensor become the fastest-growing field in the industrial sensor market

the principle of vision sensor is to capture thousands of pixels of light from a whole image. The clarity and fineness of an image are usually measured by resolution, expressed in the number of pixels. Some vision sensors provided by Shanghai Bestway can capture 300000 pixels, and the vision system can reach 2million pixels. Therefore, no matter a few meters or centimeters away from the target, you can "see" a very delicate target image

after capturing the image, the visual sensor compares it with the reference image stored in memory to make analysis. For example, if the visual sensor is set to identify machine parts with eight bolts inserted correctly, the sensor knows that parts with only seven bolts or parts with misaligned bolts should be rejected. In addition, the visual sensor can make a judgment no matter where the machine part is located in the field of view and whether the part rotates within 360 degrees

among the available inspection alternatives, namely visual system, photoelectric sensor, manual inspection, and visual sensor, visual sensor is usually the best choice because of its accuracy, ease of use, rich functions and reasonable cost

with the increasingly fierce competition in various industries, the profit margin gradually becomes smaller, and manufacturers cannot afford the high scrap rate caused by defective products. Therefore, in order to detect problems before incurring high costs, manufacturers are integrating inspection into the whole manufacturing process

compared with photoelectric sensors, visual sensors give machine designers more flexibility. In the past, applications requiring multiple photoelectric sensors can now use a visual sensor to test multiple features. The vision sensor can check a much larger area and achieve better target position and direction flexibility. This makes vision sensors widely welcomed in some applications that can only be solved by photoelectric sensors. Traditionally, these applications require expensive accessories on the basis of the same formula, as well as precise motion control that can ensure that the target object always appears in the same position and posture

in addition, since the cost of a basic visual sensor is only equivalent to several photoelectric sensors with expensive accessories, the price is no longer a problem

vision sensor provides unparalleled flexibility for application switching. For example, the switching of the production process (from a single serving of yogurt to an ice cream bucket) may only take a few seconds and can be completed remotely. Additional inspection conditions can be easily added to this application

no matter what progress has been made in factory automation, many inspections are still completed with the naked eye. However, in most applications, many of the advantages of visual sensors are beyond the reach of manual inspection processes. The vision sensor can work at a much higher speed; Perform repeated, repeated, and consistent inspections at a much lower cost

the low cost and ease of use of visual sensors have attracted machine designers and process engineers to integrate them into various applications that once relied on manual work, multiple photoelectric sensors, or did not test at all. Industrial applications of vision sensors include inspection, metrology, measurement, shrinkage orientation, defect detection and sorting. The following are just some application examples:

in the automobile assembly plant, check whether the glue beads applied to the door frame by machine are continuous and have the correct width

in the bottling plant, check whether the bottle cap is properly sealed, whether the filling liquid level is correct, and no foreign matter falls into the bottle before sealing the cap.

in the packaging production line, ensure that the correct packaging label is pasted in the correct position.

in the drug packaging production line, check whether there are damaged or missing tablets in the blister packaging of aspirin tablets

in metal stamping companies, stamping parts are inspected at a speed of more than 150 pieces per minute, which is more than 13 times faster than manual inspection

for factory automation and process automation, machine vision is the basis for realizing real automation and an important means of quality control

machine vision, as the name suggests, is to use the automatic method of machine to realize the function similar to human vision (eyes + visual nerve center + visual nerve cells). For factory automation and process automation, machine vision is the basis of realizing real automation and an important means of quality control

if we can summarize the composition of machine vision system in the simplest sentence, it is that machine vision composed of lens, camera and controller replaces manual work, and measures and judges various parameters such as size, defect, type, matching, text, etc. according to the picture obtained by the object in a certain environment. Help customers improve production efficiency and reduce the impact of uncertain factors in the automation field of labor on product quality

for the whole industrial chain of machine vision, the current domestic situation is somewhat special. In terms of suppliers, because most of them are foreign manufacturers, there is a problem of understanding the domestic market and domestic culture. Everyone has seen the rapid development of the domestic economy, but perhaps the driving factors of this development are different from those in foreign countries, which they cannot fully understand in a short time. I believe that the current domestic sales situation is still a long way from the hopes of most suppliers. Even if Omron has entered the Chinese market for more than 20 years, and machine vision has been growing rapidly in recent years, the current market sales are still far from being compared with Japan

as for the user side, the biggest problem lies in the lack of understanding of machine vision. Of course, this is also due to the special situation in China, which is the comparison between the domestic labor cost and the initial investment in machine vision. Either they don't understand the new product or the method to solve the problem, or they don't know much about the comparison between this new method and traditional labor. This requires more promotion from suppliers

the integrator, the bridge between the user and the intermediate supplier of the scraping pan, also lacks understanding of machine vision. I don't know that in addition to machinery and ordinary sensors, there is another way to make some judgments through pictures/images. Domestic system integrators are also very scarce, and the proportion of self-made equipment made by domestic manufacturers is too low, which is also a problem that cannot be solved in a short time

the initial investment in machine vision is undoubtedly a problem that everyone who is ready to buy needs to consider under the background of low domestic labor cost, which also puts forward higher requirements for machine vision system, both in price and performance. Based on the above understanding, insiders suggest that in the growth stage of this new product, early market cultivation, customer cultivation, or system integrator cultivation is very important. So we spent a lot of time on the training of basic knowledge of machine vision, hoping to make more people know machine vision and its basic principles

the future of machine vision is very optimistic and confident. I believe that under the premise of constantly improving myself, with the improvement of domestic automation, the improvement of the requirements of the whole society for product quality, the improvement of the requirements of the manufacturing industry for production efficiency, the new product and new concept of machine vision will also be deeply rooted in the hearts of the people

just like these stages experienced by the current automation power at the beginning, it will also make greater achievements in the larger market. Therefore, Shanghai Bestway believes that the future of machine vision is bright and the road is long. As for the specific time, it may take six years, or only three years, or less, because once the domestic development starts, the speed will be amazing. (end)