Everyone is familiar with safety light barriers. It is also a very high-use safety component in our safety guards. Can it be seen that it represents the security protection of the device? Now let's get straight to the topic. Let's take a look at the safety grating installation. Is there a problem with the protection effect?

Some people think that the grating is very close to the movement mechanism. Can the machine stop immediately when I touch the safety light grid? If you can't, there's a good chance your hand will hurt! It's smart, we all need to react to things, and of course machines need time to react and judge. The longer the reaction time, the greater the distance that my hand penetrated the danger zone. very fragile! Obviously, the answer to the question just now is obvious.

How should the distance of grating installation be reasonable? Here we introduce the concept of the minimum safe distance (S). The calculated distance between the safety guard and the hazardous area to prevent persons or body parts from entering the hazardous area until the machine is in a safe state. How to calculate the minimum safe distance? See the formula below:

S=K * T + C

Among them: K——The data comes from the human body or the approaching speed of the human body, the unit is mm/s;

T——The downtime of the whole system, which consists of two parts: the response time of the grating and the response time of the mobile machine to stop motion, unit: s;

C——Invasion distance, that is, the distance that the human body or part of the human body invades the dangerous area before the safety device is activated, unit: mm;

Then the problem appeared here again. To calculate S, I must have three values of K T C. How did you get all three?

K: The approach speed of the human hand is generally 2000mm/s, and the approach speed of the human body is generally 1600mm/s;

T: This value must be obtained from the equipment supplier and the safety light grid supplier. What time are they?

C: There is a calculation formula here, which is also related to the detection capability of the safety light grid.

C=8*(d-14), d represents the detection capability of the grating, which needs to be provided by the supplier; in this way, we can calculate the minimum safe distance. Below we use an example to simply calculate the explanation. The downtime of the machine is 60ms. The machine is equipped with a safety grating with a detection capacity of 14mm and a response time of 30ms. What is the minimum safety for a grating pitch hazardous area to prevent hand entry?

S=K*T+C=2000*(0.03+0.06)+8*(14-14)=180mm

Probably everyone has a certain understanding of the installation of gratings, and some people may ask here, in practical situations, some grating protection areas may not be perpendicular to the dangerous area and have a certain angle, so the calculation seems unreasonable? It's so smart, whether it's the angle that exists, whether the height of the raster can intersect, etc., we're not going to expand it here. I will have the opportunity to discuss it in depth later. Scaling can take a long time. I will share with you today. Do not assume that installing a grating is reasonable and safe. On the one hand, the installation distance mentioned today is the safety level  safety ring, etc., and I will have the opportunity to speak slowly in the future.