HYDRAULIC EXPANDING UNIT FOR ROCK-BOLTING
HEU 320-40E
March 2011
OPERATION
Water
pressure
Flow
switch
300 bar
0
1
Pressure
transmitter
Ready
t
Ta
at 5 - 8 bar
WATER PRESSURE STARTS TO INCREASE
WHEN THE ROCK-BOLT IS GOING TO BE
EXPANDED WITH HEU-UNIT PUMPED
WATER.
FLOW SWITCH, HAVING RECOGNIZED
THE PRESSURE GAIN, GIVES A PULSE
ALLOWING THE PRESSURE INCREASING
CLOSE TO THE MAXIMUM.
BY PULLING EXPANDING GUN’S TRIGGER
AN OPERATOR ACTIVATES THE HEU-UNIT
PRESSURE TRANSMITTER HOLDS THE
MAXIMUM PRESSURE FOR THE
PRE-ADJUSTED TIME INTERVAL
ENSURING THE SECURE ANCHORING BY
THE BEST FIT OF THE EXPANDED
ROCK-BOLT TO THE BORE’S
IRREGULARITIES
RIGHT AFTER EXPIRATION OF TIME
INTERVAL THE WORKING CYCLE CAN
BE REPEATED.
T
a
3 / 5
BOTH TIME INTERVALS AND CAN BE RE-ADJUSTED
AT FACTORY TO MEET CUSTOMER’S REQUIREMENTS.
T
a
t