SHEARMATIC, digital automatic direct/residual shear machine with programmable pneumatic loading
SHEARMATIC, digital automatic direct/residual shear machine with programmable pneumatic loading
This new microprocessor based advanced model, is a stand-alone machine, driven by a high-resolution stepper motor with epicyclical reduction gear with a reduced backlash. Incorporates a pneumatic closed loop system for the automatic application of the axial pressure by a high performance pressure regulator, with the main advantage of eliminating the manual loading of the dead weights.
Excellent quality and high resistance techno polymeric material has been adopted for the carriage of the shear box.
It offers excellent resistance to corrosion, wear and tear and is resistant to all chemicals found in a soil specimen. The carriage is lightweight and easy to clean.
Electronic
The electronic parts of the SHEARMATIC is based on our Automax” unit, this is a microprocessor system that reads and processes the force, axial pressure and displacement readings, manages the motor, the pressure valve, the safety systems and the test steps through closed loop systems. It features a front panel in scratchproof poly carbon with a ten key keyboard and a large monochromatic graphic display.
Electronic transducers supplied with the machine
The machine is supplied complete with:
- ±5 kN capacity load cell, bi-directional type (compression and tension), nominal sensitivity 2 mV[V, accuracy ± 0.03%.
- 10 mm displacement transducer, 1 kø nominal resistance, ± 0.25% linearity, 0.002 mm repeatability
- 25 mm displacement transducer, same specification as above.
- 1000 kPa pressure transducer, O.lkPa accuracy, nominal sensitivity 2 mV/V.
- Automatic pneumatic application of preset consolidation steps (up to 50)
- Automatic management of the test with the possibility to directly continue from consolidation to failure (the operator only needs to remove the damping screws of the shear box)
- Sets of heavy and bulky dead weights are not required
- A balanced lever arm maintained horizontal is not required
- The vertical force is positively applied to the shear box without any friction
- Straight connection between shear box, drive unit and load cell for the axial transmission of the horizontal force along thc shearing plane. Instead of the classic "swan neck”
- New high resistance techno—polymeric carriage
- Easy and immediate set up of the test parameters via the large digital graphic display
- Possibility to set different speeds and travel (forward and reverse) in the residual shear tests
- Each single step of axial force can be applied:
- instantaneously
- by means of a linear ramp in a preset time interval
- Different and independent data recording mode for consolidation and failure
- Different protocols of data downloading via RS 232 serial port
Display: monochromatic large digital display (240X128 pixel)
Motor: high accuracy stepper motor with 1/10.000 resolution
Test velocity: infinitely varaible from 0.00001 to 11.00000 mm/min (-/+ 1%)
Maximum horizontal force: 5 kN
Maximum vertical force: 8kN 800 kPa for a specimen 100x100mm
Maximum shear cycles: 9 (forward and reverse)
Maximum Travel: 19mm
Height of the specimen: 20 mm
Maximum air pressure supply: 10 bar
Maximum working air pressure: 8 bar
Overall dimensions: 973X421X427mm (lxdxh)
Weight approx.: 100kg
Shear box assemblies
Air compressor
- 86-D2015 Laboratory air compressor 10-bar max. pressure, 50 litres cap. 240 V, 50Hz, 1 ph.
- 86-D2015/Z Same as above but 110 V, 60 Hz, 1 ph.
Data processing software
- 30-WF6016/T2 Direct and residual shear Geo-Analysis template, supplied on disc
MACHINE SET UP
