Specifications

CAK50/CAK61 SERIES ERROR! USE THE HOME TAB TO APPLY 标题 1 TO THE TE
X
SHENYANG MACHINE TOOL CO., LTD 32
Northman. This kind of pump is characterized by low noise, stable performance,
rated draining flow of 11.1ml/r
，rated pressure 7 MPa，the working pressure of
1.5
～3.5 Mpa, and its real flow quantity can be adjusted according to the speed of
chuck movement.
 Return for Chuck with Changeable-clamping-force (refer to Fig.5, Diagram of
hydraulic principle)
During the machining, according to different conditions, we have designed chucks for
internal clamping and external clamping. It is needed to change the clamping force
during the machining some special parts, so we have designed hydraulic chuck with
changeable-clamping-force.
On the return of hydraulic system there is a high pressure clamping and a low
pressure clamping, and they are separately controlled by pressure relays SP1 and SP2.
When YV1
（electrification）and YV5，it’s high pressure clamping. SP2 sends out a
signal. At this time SP1 has the same pressure as that of the system and the adjusting
pressure is 2.0
～2.5Mpa.
When YV1
（electrification）and YV6，it is low pressure clamping. SP2 sends out a
signal. At this time the adjusting pressure of SP2 is the same as that of pressure-relief
valve, and the adjusting range is 0.4
～0.8Mpa.
Description for adjustment of MEPS superimposed electro pressure relay
1. Clockwise adjust the potentiometer for return difference to minimum (in fact, adjust
the return difference to zero).
2.
Adjust the pressure to P (1-), in general, take  =5%. P is a working pressure, P
(1-) is an alarm pressure; the alarm pressure takes 3.8 kgf/cm
2
when P = 4 kgf/
cm
2
).
3.
Adjust the upper-limitation potentiometer to make the indicating light just lighting
on (in fact that the upper-limitation potentiometer is regulated at alarm pressure P
(1-).
4.
Turn the potentiometer of return difference by 4-5 turns counter-clockwise (in fact
that the return difference should be regulated more than 5%, at this time, the
indicating light is still lighting on).
5.
Adjust the pressure to P (in this time, the indicator still lights on).
6.
Adjust the potentiometer of return difference slowly and clockwise to make the
indicating light just goes out (in fact, adjust the surplus to 5%).
7.
If working pressure is needed to rise, it is necessary to readjust it according to the
regulations given by steps 1-6.
When YV2, YV5 are electrified, the chuck is released.
After the workpiece is clamped, the pressure relay PS－70 sends signal for clamping
ready. During machining, if the pressure goes down due to the troubles of the system,