1. The installation of the safety grating must be able to effectively prevent the situation of bypassing the detection area of the safety grating and contacting the dangerous moving parts, that is to say, there can be no blind spot in the detection area of the installed grating, if there is a fixed guard at the top or bottom of the safety grating, the guard should be able to effectively prevent the contact with the dangerous moving parts from bypassing the grating from the top, bottom or side of the grating. If there is no fixed guard at the top or bottom of the safety light curtain, there should be a sufficient safety distance between the safety light curtain and the danger point to prevent personnel from bypassing the light barrier from coming into contact with dangerous moving parts, in which case the safety distance can be calculated according to the formulas and tables in the standard EN ISO 13855.
Exposure to dangerous moving parts from the bottom of the grating Reach dangerous moving parts over the top of the grating
When the grating is used as a safety detection device to prevent personnel from entering, the bottom detection beam of the grating must be less than 300mm from the detection plane, and the highest detection beam must be greater than 900mm from the detection plane, so as to prevent personnel from climbing from the bottom of the grating or crossing the top of the grating to enter the dangerous area without triggering the grating.
2. The requirements for the safety distance must also be taken into account when installing the safety light curtain, and the distance between the safety light curtain and the danger point must meet the requirements of the minimum safety distance required in EN ISO 13855.
The safety grating detects that there is an object or person intruding into the danger area, and issues a stop order, when the person touches the danger point, the dangerous action mechanism has been safely stopped, so that the safety grating can play a protective role, according to the standard requirements, the minimum safety distance can be calculated by the following formula:
S=(K×T)+C
Among them: S minimum safety distance
K approach speed
Downtime
C added value
(1) K is derived from the parameter of human body or human body part approach velocity data, i.e., the velocity of a certain part of the body that intrudes into the danger area, the unit is millimeters per second (mm/s), when the distance between the grating and the danger point, assuming, is 2000mm/s; When the distance between the grating and the danger point, assuming , is 1600 mm/s
(2) Downtime
The downtime of the whole system includes the maximum time from the actuation of the safety guard to the output of the shutdown signal, T1, and the maximum time required to terminate the function of the dangerous machine after the safety guard outputs the shutdown signal, T2, which shall include the response time of the machine control system;
System-wide downtime
a. Trigger the safety protection device
b. The safety protection device is output to the machine
c Elimination of hazards
The system downtime of the machine needs to be tested by professional test equipment, and a professional third-party company can be found to test to determine whether the safety distance meets the standard requirements.
Machine downtime detection device
(3) C added value
For specific types and configurations of protective devices, the standard EN ISO 13855 gives different calculation values and formulas for determining the added value C, which is not less than 0.
Therefore, when the machine is equipped with a safety grating, in addition to selecting the correct grating and building the correct safety loop, it should also consider whether there is a blind spot in the installation of the safety grating, whether there is a possibility that the safety grating can be bypassed to contact the dangerous moving parts, and whether the safety distance of the grating meets the requirements of EN ISO 13855, so as to ensure that the safety grating can effectively prevent personnel from directly contacting the dangerous moving parts.
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