Qily Sensor Technology (Dongguan) Co., Ltd.

China's leading industrial safety / inspection / measurement light curtain manufacturer

Here, I would like to talk about the need to pay attention to the installation of safety light curtains.

      Note: The installation position refers to the position of the safety light curtain relative to the upper and lower die of the machine. That is, under the premise of ensuring the safety distance, the last light of the safety light curtain shall not be higher than the lower edge of the lower die, and the upper beam shall not be allowed. Below the upper edge of the upper die. This involves the safety light curtain protection height
UploadFile/image/20181027/20181027151071357135.png
Calculation of safety distance
In order to ensure the operator's personal safety, the installation position of the safety light curtain must meet the requirements of the safety distance. Otherwise, there is still the possibility of an accident.
■ Safety distance refers to the minimum distance between the light curtain and the cutting edge of the die. The calculation method should be calculated according to the formula of the brake method of the press, or refer to the following table.
■ For presses where the slider can be braked at any position of the stroke, the safety distance:
Ds=1.6(T1+T2)
Where: Ds - safety distance, in meters (m)
1.6 - Stretching speed of the hand, in meters per second (m/s)
T1 - response time of safety light curtain, 0.02 seconds (s)
T2——The braking time of the equipment, that is, the time from the start of braking to the stop of the slider, in seconds (s), measured from the actual braking condition
■ For presses where the slider cannot be braked at any position of the stroke, the safety distance:
Ds=1.6Ts
Where: Ds - safety distance, in meters (m)
1.6 - Stretching speed of the hand, in meters per second (m/s)
Ts - the time from when the person leaves the light curtain (that is, the slider is allowed to start) until the device slider reaches the bottom dead center, that is, the down travel time of the slider, in seconds (s), can be calculated according to the following formula or actually measured:
Ts=(1/2+1/N)T
Where: N - the number of engagement slots of the clutch
Tn - the time the crankshaft makes one revolution, in seconds (s)
UploadFile/image/20181027/20181027151128572857.png