- 13-
l
The braking time of pressure machine should be measured according to the situations.
l
The calculation method of Ts is given in the following formula.
Therein:
N
- Number of engagement slots of clutch;
T
n
- Time that the crankshaft rotates one cycle (S).
Determination of C value
l
The additional distance C is determined on the basis of the entry of hand into the light curtain
of safety light curtain (response area) without causing the response of safety light curtain.
l
According to the detection accuracy of the safety light curtain, C value is selected according to
the rules of the following table when calculating the safety distance.
Detection accuracy (mm)
Additional distance C(mm)
Stroke start of safety light
curtain
≤
14
0
Allowed
>14-20
80
>20-30
130
>30-40
240
Not allowed
>40
850
Warning
The safety distance is one of the necessary conditions to ensure the protection function of the
safety light curtain. The safety distance must be calculated correctly and must be ensured
when installing!!
3.1.2
Determination of height position
Height position refers to the protection height of the safety light curtain relative to the upper and
lower position of the die of the machine tool. Namely under the premise of guaranteeing the safety
distance, the undermost light beam of safety light curtain should not be higher than the lower edge
of lower die and the uppermost light beam should not be lower than the upper edge of upper die, as
