Laboratory Tests

Since 1995, the Laboratory of Tests has had an accreditation of the Polish Centre for Accreditation (Certificate No. AB 039), which includes tests of the following components:

  • powered roof supports,
  • hydraulic actuating components,
  • hydraulic valves,
  • leak-tightness and durability of hydraulic hoses,
  • hydraulic transmission pipelines, their components and fittings,
  • friction props,
  • clevises,
  • steel sprags,
  • mesh for roadway lining.

The Laboratory guarantees unbiased, objective and reliable performance of tests due to the implemented quality management systems, according to the Standards: PN-EN ISO 9001:2001 and PN-EN ISO/IEC 17025:2005.

A high quality of testing services is guaranteed due to appropriately educated and trained staff and unique test rigs equipped with the state-of-the-art testing and measuring apparati.

The main test rigs are as follows:

  • rig for static and fatigue strength testing of a powered roof support unit,
  • rig for testing kinematics and functionality of complete powered roof supports,
  • rig for testing legs and high-pressure hydraulic components,
  • rig for strength testing of machinery components.

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Rig for strength testing of powered roof supports Loading of the support unit in the vertical plane can be applied by an active movement of the rig roof, simulating the rock mass pressure or passively, supplying the supportunit hydraulic system with high-pressure liquid delivered from the pressure multiplicators.

 

Rig for functionality testing of powered roof supports The rig enables to conduct tests simulatingan operation of supports both in horizontal seams and in the inclined ones up to 90 °.

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The Laboratory of Tests conducts measurements and recording of pressure, relative elongation, displacement, force, speed, flow intensity and quick-changing parameters using the following measuring apparati:

  • UPM 60 multi-point measurement system, made by Hottinger,for taking measurements and recording relative elongations, pressures and displacements,
  • MVD 2420 and MVD 2455 amplifiers,
  • XY multi-channel recorder, made by Yokogawa, model AR 1100A,
  • Spider 8 amplifier with computer recording, made by Hottinger, used for quick-changing measurements,
  • tensometric pressure converters, inductive displacement converters, resistance strain gauges, tensometric dynamometers and turbine flow meters.

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Rig for testing legs and high-pressure hydraulic components The rig is used for testing legs, hydraulic control equipment as well as hydraulic hoses. In the case of legs there is a possibility of conducting tests, applying static and dynamic loads. The dynamic loads are obtained with the useof explosive materials.

 

Rig for strength testing of machines and equipment  The rig is used for strength testing of assemblies and machinery components subject to tension, compression, bending and to
complex loads. It enables to conduct strength testing on two levels.

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Besides Polish manufacturers of machines and equipment also foreign contractors are orderers of tests. Within the recent the Laboratory of Tests started collaboration and carried out the tests for customers from Ukraine, Belarus, Russia, Spain, Great Britain and the USA.

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Spider 8 amplifier with computer recording, made by Hottinger, used for quick-changing measurements.UPM 60 multi-point measurement system, made by Hottinger, for taking measurements and recording relative elongations, displacements and pressures.