Industry 4.0 is inseparable from intelligent manufacturing, and intelligent manufacturing is inseparable from machine vision inspection. The use of machine vision detection equipment can greatly improve the detection efficiency, save labor, reduce the overall production cost, improve economic benefits. So, how to choose the right machine vision inspection equipment?

A typical machine vision equipment mainly includes five parts, which are lens, camera, lighting, image acquisition card and software tools.

One, lens

Many factors should be considered when selecting lens, such as focal length, target height, image height, magnification, distance from image to target, center point/node, distortion and so on. In the practical application, "selecting the lens consistent with the field of view" and "focusing the image with a large depth of field" are two very important aspects when selecting the lens. If the use of the scene to choose a more accurate industrial lens, but also must consider the field of view, working distance, CCD size and other factors.

Second, the camera

CCD and CMOS are two kinds of image technology commonly used now. The main difference between them lies in the different transmission mode. The difference in performance is mainly noise, power consumption, resolution, sensitivity, cost and so on.

When choosing a camera, we should first define our own needs:

1. to determine the accuracy of the test product requirements;

2. to determine the size of the camera to see the field of view;

3. to determine the speed of the detection object;

4. to determine whether it is dynamic detection or static detection.

After the requirement is clear, the hardware type should be determined, including the determination of pixel size, the determination of transmission mode and the selection of trigger mode.

Three, lighting

Illumination is an important factor affecting the input of machine vision equipment, which directly affects the quality of input data and application effect. Because there is no universal machine vision lighting equipment, it is necessary to select the type of light source for each specific application instance, and consider the installation and irradiation scheme of light source according to the actual natural environment to achieve the best effect.

Four, image acquisition card

The image acquisition card is only one part of the complete machine vision equipment, but it plays a very important role. The image acquisition card directly determines the interface of the camera: black and white, color, analog, digital, etc. Machine vision inspection equipment in the industrial camera types of different, in the selection of image acquisition card should also be different. Pay more attention to factors such as card stability, price, function and product cost when choosing.

Five, visual software

Machine vision software is a key part of automatic processing in the machine vision system. According to the specific application requirements, the secondary development of the software package can automatically complete the image acquisition, display, storage and processing. Through the early transmission to the special image processing software, according to the pixel distribution and brightness, color and other information, converted into digital signal; The machine vision software then carries out various operations on these signals to extract the features of the target, and then controls the action of the equipment in the field according to the discriminant results.

Machine vision software is mainly sold in two typical forms, one as complete visual toolsets and the other as tool applications for specific tasks. Factories can choose tools according to their specific needs, but also take into account the stability of software operation, operation difficulty and other issues.

With the development of optical screening machine industry, there are a large number of equipment suppliers. As the qualification of manufacturers varies, the buyer should make some corresponding preparations before checking the qualification of suppliers, so as not to spend a lot of money but do not buy satisfactory equipment. Can be from the following three points as a reference, for you to buy satisfactory equipment.

1. Sample collection

The collection of samples is divided into two categories: good and bad. Good products can have several, bad products can be divided into a variety of bad, such as Nick, burr, black spot, plug hole, crush, deformation and so on. The quantity of defective products should be more, and the products should be packed according to the category and marked which kind of defective products are, so as to facilitate the supplier to make samples.

2, the determination of accuracy

Customers often believe that higher accuracy is better and that the fewer defects the device can detect, the better. In this way, we can achieve zero defect factory? In fact, the equipment is not universal, optical screening machine is not a microscope, and can not achieve the accuracy of the microscope. Accuracy is not the higher the better, but to choose the appropriate accuracy, otherwise it will produce a large number of defective products. For example, when manually screening product gaps, gaps within 1mm can be spared, and the accuracy range can be set to within 1mm. If the accuracy is set too high, it is easy to cause waste. If the accuracy is set too low, the optical screen will judge the manually screened defective products as good products, resulting in false detection. Some products have high requirements for accuracy and need to reach the accuracy range of 0.001mm, which cannot be measured manually. At this time, the role of optical screening machine becomes very important.

3. Determination of output

The main purpose of purchasing equipment is to improve production efficiency. If the product output is small and the efficiency requirements and quality are not high, then manual testing is a better choice. If a product needs more than three people to test, then the choice of optical screening machine is very necessary.

In fact, when choosing machine vision detection equipment manufacturing enterprises, the first thing to clear their own needs, so you can choose to suit oneself better product testing equipment, as well as choose the good market reputation, visual inspection equipment manufacturing project experience, so as to have a better product quality assurance and after-sales service guarantee. In the future use, there will be no equipment unattended, unmanned after-sales problems.