OPERATING MANUAL FOR
HT DIGITAL COMPRESSION TESTING MACHINE
CAPACITY 250 KN
INTRODUCTION: The ultimate consideration in concrete
structural design is an attainment of desired Strength Tests conducted on
sample pieces ensures the concrete is in accordance with given specification. The HT large capacity Compression Testing
Machine prove in valuable in large construction sites like, Dam, Bridges,
Airstrips, River Valley Project, Large Mines and Research laboratories. They can be used for testing cubes upto 50x50x50mm and also very high strength specimen of a
smaller capacity. The machine generally
confirm to IS 516, B.S.S. 1610, 1881 and various other international standards.
DESCRIPTION : The
Compression Testing Machine consists of a loading unit and a motorized pumping
unit, which are illustrated in attached figure.
The numbers are given against the components of the equipment in the
description below pertain to theses drawing.
LOADING UNIT :
(Load Frame) It consists of a steel cross head and machined steel base with
four tension rods connecting the base and the corss head and firmly tightened
by means of nuts. The machine is covered
three side with wire mesh door in front and mesh fixed shelves in right and
left side. The Hydraulic Jack (Piston Cylinder) of 250 KN capacity is fixed
on the base. The upper platens has a
self aligning action and is attached to
a block protruding from the cross head.
The lower platen rests on the jack ram and positioned centrally with the
help of a centering pin. The upward movement
of the lower platen accomplishes loading.
The lower and the
upper platen of the machine are hardened and ground. Markings are provided on lower platen to keep
the specimen centrally and coaxially with the hydraulic jack. A dust cover is provided on the jack to
prevent any dust penetrating into cylinder of the jack.
Three spacer with
centre locating pins are provided to the inserted in between the lower platen
and hydraulic jack reduce the excessive gap between the two platens when small
specimens are to be tested. The
centering pin also prevents the platen slipping out of the assembly while
loading or failure of sample.
PUMPING UNIT ; Digital pumping unit motorized in an elegant
console wired for 220 single phase
supply. Two plunger with
reciprocating motion operated to pump oil.
The plungers are operated by cam activated by motor. A oil reservoir has a total cap. of 5 litre
approximate and is sent with a full charge of multigrade oil of grade
20/40. A transparent tube oil level
indicator is provided on the tank. A
load indicator of four digit LED display is fitted on the panel with facility of overload
cutoff. The load indicator is calibrated
by NCBM certified PROVING RING and calibration chart is sent along with this
manual . A pressure release valve is
provided to start loading when open the
oil will retrun to the pump even when pump are pumping. A slow fast knob a flow adjustment valve is
provided to adjust rate of flow. A
clock wire rotation increases flow and
thereby rate of loading and anticlockwise, poisition allows no flow of oil from
pump. A power on switch and power off
switch is provided to start/stop the machine. A indicator lamp is provided to indicate that power has
gone into the unit. The loading unit
assembly connected to the console with the help of rubber hosepipe.
Setting and
Assembly: Unpack the boxes with base down.
The columns and pumping unit console are sent in separate boxes. Fix the load frame and pumping unit module on
a level ground. Foundation is not
essential. If the machine is to be
permanently fixed, the load frame can be fitted on to 6” slab and bolted. Connect the load frame to the pumping console
using rubber hose pipe provided. Connect
console to 220 volts, single phase 50 Hz
A.C. supply. The red indicator
lamp glows showing the console has received power supply.
Switch on the
Digital Indicator
Press the zero
button and the peak button to enter the peak hold mode .
Close the release
valve.
Place the cube in
to Load frame to test ON the lower platen with suitable spacers and closed the
wire mesh door for safety precaution.
Switch on the
machine pump to start applies load cube.
Adjust the
slow/fast knob for proper rate of loading.
Peak valve is
stored in the memory as soon as the
specimen is broken/crushed. Switch off
the machine and release the pressure with the help of release valve. Allow the piston to come down. Open the wire
mesh door and remove the broken specimen.
Clean the platen and place the next cube and start the above process
again. Reset the peak button to bring
the digital back to zero.
MAINTENANCE:
The machine should
always keep clean.
The platens and all
other unpainted parts should be greased when not in use to prevent rusting.
The oil level in
the pump should be maintained between the oil indication level.
In no case the pump
should be operated when there is no oil in the pump or the oil level is blew
the lower mark.
Hydraulic oil Servo
System 526 of Indian Oil Corporation is filled in the mach. This oil or any equivalent oil only should be
used.
When oil starts
leaking from the jack cylinder piston the seal should be replaced.
The oil in the
system should be changed half yearly as a normal practice but this period can
be increased and decreased according to the used of the machine.
Over tightening the
pressure release valve should be avoided.
It should be kept a couple of turns unscrewed this is not being used.
Care should be
taken not to take out the ram more than 50mm (maximum limit.)
The machine should
never be over loaded beyond its capacity.
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