Power Unit and Frame with hydraulically operated safety cover
Manual Load Lock for repeat testing
Cylinder Speed Adjustment
Load Limit Control
Load Cell and Digital Meter with Auto Ranging:
12,000 to 120,000 lbs. 5,443 Kg to 54,431 Kg
120,000 to 1,200,000 lbs. 54,431 Kg to 544,310 Kg
Small cylinder for testing 2,000 to
50,000 lbs 907KG to 22,680 Kg w/ load cell, 5" (7.54 cm) bore x 36" (0.915
m) stroke
Portable Load Cel
Calibration to ASTM E4, ISO 17025, A2LA
12,000 lbs to 120,000 lbs 5,443 Kg to 54,431 Kg
120,000 lbs to 1,200,000 lbs 54,431 Kg to 544,311 Kg
Specifications
Hydraulic Cylinder Stroke 72" (1.829
m)
Total length 40' (12.192 m)
Maximum pull pin to pin (approx.) 25' (7.62 m)
Approximate width outside (standard) 72" (1.829
m)
Center line height from floor (standard)
14.5" (.3683 m)
Speed of cylinder per minute (approx.)
20" (.508 m)
Features
Tension is supplied by a hydraulic cylinder. For easier and
faster hook up, the cylinder is in the pulling mode.
The moveable carriage allows for testing of different sling lengths.
The carriage is pinned into position through holes on the side
rails.
The hydraulic cylinder is built to our specifications for this
application. It is an expensive, top-of-the-line, high pressure
cylinder, and must be compatible with the load cell.
Speed adjustment for the cylinders
is another feature. It is a very simple item, but by incorporating
it into the power unit, we are able to make the cylinder retract
at the speed desired.
The foundation of this system is the hydraulic power unit. Being
able to control the hydraulics at small increments with a constant,
steady flow of hydraulic fluid to the cylinder allows us to calibrate
to ASTM E-4, +/- 1%, traceable to the National Institute of Standards
and Technology (NIST). Pulsations or fluctuations of pressure will
be transferred into the load cell and give erroneous readings on
test data. The power unit is connected to the test machine by hydraulic
hoses.
The hydraulic power unit has very sophisticated and accurate
pumps and valves for the purpose of adjusting very small increases
in pressure and maintaining a very accurate flow. The power unit
also has electric valves versus manual valves.
For repeat testing, a manual loadlock is furnished at no charge.
For testing several items, the operator sets this on the first
test piece. The machine will automatically return to this pressure
load each time a new piece is placed into the machine.
A remote control pendant is furnished at no charge. This allows
for safer, faster, and easier hook-ups.
Hydraulically operated cover
The load measuring system electronic load cell is the heart of
the system. The load cell allows very accurate recording of the
load attained during a test. The electronic strain gauge load cell
is an independent measuring system not tied into the hydraulic
system. This load cell system, with two ranges, may be calibrated
from 1% to 100% of the maximum capacity of the load cell. The load
cell will calibrate to ASTM E-4, +/- 1%, traceable to the National
Institute of Standards and Technology (NIST).
Load cells and gauges are normally calibrated for only 10% to
100% of their range. The lower 10% of a range is usually neglected.
With the Auto Range function, calibrating at the lower limits is
possible. The digital indicator automatically selects between two
ranges and allows the operator to test at lower levels of force.
The standard is 1% to 100% of the maximum range.
The separate peak/hold system is an excellent feature. It automatically
resets. The peak/hold recall must be manually reset after each
use. At times, the peak of the last test could possibly be lost
if the peak/recall were not reset before each test. With an automatic
system, you never lose the peak of the last test because it automatically
resets.
The Load Limit Control feature makes it possible to control the
force being applied and the amount of time the test will perform
at that level of force. The Load Limit Control will also let the
operator set the limits of fluctuation of force, so a test will
not be run below a specified force, nor above a specified force.
Value
Our proof test machines are the best balue in
the industry. We offer more features as standard items than our competitors.
Our test machines are stronger due to the amount of steel content
and design. They calibrate easier and stay in calibration longer.
The differences between Roberts Testing Equipment, Inc. test beds
and the competition are as follows:
Roberts Testing Equipment, Inc.
Safety: Fully enclosed
Load measuring system is an independent electronic load cell
with digital readout (see pressure transducer vs. load cell information
sheet.)
Very accurate low range. Will calibrate to ASTM E-4
Standard guarantee: Accuracy of 1%
of reading on digital indicator from 1% to 100% of maximum
of machine.
Independent system is accurate on break tests.
Competition
Unsafe: Not fully enclosed. Bottom open.
Load measuring system is a pressure transducer, dependent on
the hydraulic pressure, with digital readout
Not accurate at low range. Will not calibrate to ASTM E-4.
They guarantee from 10% to 100%. Lower 10% of maximum range
is not accurate.
Hydraulic pressure transducer is not accurate on break tests
Safety
We also have a standard safety feature which
is a fully enclosed frame including sides, ends, and top. Other manufacturers
do not offer this. With their machines, if an item breaks, the small
pieces will come out from under the sides and out the end of the
test machine. This is why it is important to have the machine totally
enclosed.
The following is a list
of items included with the test machine:
1,200,000 lb. 544,311 Kg test machine (see price list)
72" (1.829 m) wide frame with manual
cover
Approximate pull pin to pin of 25' (7.62 m)
1,200,000 lb. 544,311 Kg electronic load cell with Auto Ranging:
Range 1 - 12,000 lbs. to 120,000 lbs 5,443 Kg to 54,431 Kg
Range 2 - 120,000 lbs. to 1,200,000 lbs 54,431 Kg to 544,311
Kg
Digital indicator with separate peak/hold system which includes
Load Limit Control
Hydraulic cylinder with 72" (1.829
m) stroke
Hydraulic power unit (220/440, 3PH, 60Hz)
Options
Small Cylinder for testing 2,000 Lbs.
to 50,000 Lbs. 907 Kg to 22,680 Kg, Cylinder stroke 48" (1.22m)
Computer with Mircosoft XP software (desk top or lap top) and
printer. Test 35 is included on all machines.
Additional sections per 20ft (6.09m)
Additional cylinder stroke per foot (.30m)
Hydraulic guage (6") with Lbs Force
( back up unit).
Length measuring system and meter: Length measuring system and
meter to measure stretch of sample. This includes a displacement
transducer, necessary mounting, and electronic logic to sum total
displacement. The separate meter will give a digital display of
the displacement.
Installation Requirements
Items furnished by Roberts Testing Equipment:
Design and specifications for the testing machine.
All hydraulic power units, cylinders, load measuring equipment
(i.e., digital readout, load cells, etc.), test machine frame components.
Frame will be sandblasted, primed, and painted.
All supervision for installation.
All training for proper use of test equipment.
Operation manuals and maintenance manuals.
Items to be furnished by the customer:
Labor for installation.
Reinforced concrete slab, 20' feet (6.10
metres) wide, 9"(22.86cm)
thick with no major cracks or faults.
All foundation work, including anchoring
points, and anchoring systems (if required).
All lifting equipment, maintenance personnel, miscellaneous hand
tools, welding machines, cutting torches, drills, etc., needed
for test machine installation.
All electrical connections. Power unit furnished with electric
motor and starter.
All hydraulic oil, equal to Chevron AW 46, 15W.
Apply final coat of paint after installation if desired.
1,200,000 LB. 544,311 Kg 40' Base Section