PWS Series Computer Controlled Electro-Hydraulic Servo Fatigue Testing Machine

Main Technical Specifications:

1. Standardized Unit Products of Our Company:

· Two-column mainframe, with the columns hard chrome-plated and polished. Effective distance between columns: 635mm. Column diameter: 75mm.

· Upper crossbeam: hydraulic lift and hydraulic lock. Maximum adjustable test space: 800mm.

· Workbench height: 950mm.

· Frame rigidity: 3 × 10^8 N/m.

2. Servo Actuator:

· Maximum test force: Matching test force for the model.

· Maximum stroke: ±100mm (total stroke 200mm).

· Dedicated dynamic servo actuator for both dynamic and static testing.

· Double rod design, with special surface treatment of the piston rod for high surface finish, suitable for long-term dynamic testing.

· High-speed sealing components (Germany's Treiber servo Glyde ring, Steffen seals) are used between the piston and cylinder, and between the piston rod and end cap. High-speed, wear-resistant bearing rings (Germany Treiber) provide support, ensuring high actuator rigidity and strong resistance to axial loading.

· Built-in displacement sensor, external electro-hydraulic servo valve, and force sensor, with force and displacement closed-loop control systems.

· The force sensor is located at the head of the piston rod and configured with a pre-stress ring to ensure safe and reliable connection during dynamic testing.

· The actuator features a hydraulic buffering area at the amplitude limit to prevent damage from uncontrolled operation.

· Sensors:

Force sensor: American Transducer Products, bidirectional fatigue sensor for tension and compression, maximum test force: ±50kN, overload capacity of 150%, measurement error ±1%, calibrated before shipment.

Displacement sensor: Chinese AMT company, hysteresis telescoping non-contact displacement sensor, effective range (maximum displacement) ±100mm, with measurement error: ±0.5%FS, calibrated before shipment.

· Servo Valve: MOOG servo valve, dual-valve parallel usage for 300kN actuators, single valve flow: 63L/min, pressure: 21Mpa, total dual-valve flow: 120L/min; integrated with the actuator via the servo valve mount.

4. Forced Clamping Device:

4.1 Hydraulic Forced Clamping Chuck:

· Hydraulic forced clamping with a working pressure of 21Mpa, meeting the high-low frequency fatigue test requirements for materials under tension/compression zero-crossing.

· The working pressure is adjustable from 1MPa to 21Mpa.

· Open structure, easy jaw replacement.

· Includes self-locking nuts connected to the main machine’s load sensor on the upper part and the actuator piston on the lower part.

· Two sets of circular specimen jaws; two sets of flat specimen jaws (expandable).

4.2 Compression Test Chuck:

· Diameter: φ80mm.

· Designed in conjunction with the hydraulic chuck.

· Additional accessories designed to match the hydraulic chuck.

4.3 Provides accessory interface drawings.

5. Piping System:

· All hydraulic hoses are made from Parker USA products.

· The piping length between the main machine and pump station: 3-6m (depending on the lab layout).

· Other hoses include hydraulic chuck hoses, lifting cylinder hoses, etc., all imported from the USA.

6. Electrical Control System:

· Cabinet-style structure, located near the pump station, with Siemens PLC for intelligent remote control.

· Design meets national high-voltage system standards.

· Automatically switches between high and low pressure in the pump station: low pressure starts, high pressure runs.

· Total power: 7.5kW, AC, 380V, three-phase five-wire system.

· The cabinet features voltage and current meters, with buttons to control the start/stop of two motors.

· Includes various protection and alarm functions, such as low oil level, temperature limit, filter blockage, and motor overload.

· The wiring layout is reasonable, easy for maintenance, and the appearance is aesthetically pleasing.

· The client is responsible for power supply.

· Remote Control Cabinet:

Located in the control room, the PLC controls the start/stop of three motors.

Clear and reliable alarm indicators.

Includes a remote electronic pressure gauge for monitoring the pump station pressure, with alarms for filter blockage, temperature exceedance, etc.

Safe 24V operating voltage, safe to use, attractive appearance, and easy to operate.

7. Closed Cooling System (Provided by the Client):

· The supplier provides relevant parameters and design for placement and installation.

8. Control System and Computer Software System:

8.1 Controller Main Configuration:

· Test force signal conditioning unit: 1 set.

· Displacement signal conditioning unit: 1 set.

· Two-stage servo valve drive unit: 1 set.

· Signal generator unit: 1 set.

· Hydraulic control unit (pump station start/stop, high/low pressure switching, etc.): 1 set.

· Fully digital closed-loop control, with a high-frequency rate of up to 5kHz.

· Built-in signal generator with a frequency range of 0.001-600Hz and frequency resolution of 0.001Hz.

· Control waveforms: sine wave, triangle wave, square wave, ramp wave, sawtooth wave, random wave, free wave, and various waveform combinations.

· Control modes: force, displacement, deformation PID closed-loop control with smooth, undisturbed switching between modes.

· The system has sensor calibration, zeroing, and other functions.

· High-speed data communication with the computer via an Ethernet card.

· Features comprehensive hydraulic control, such as controlling pump station start/stop and high/low pressure switching.

· Provides multiple interface boards compatible with various sensors and driver units.

8.2 Software System: 

The software system is a mainstream multi-channel dynamic testing system, particularly suitable for various research institutions due to its wide coverage of test standards, flexibility, and ease of data import/export. Key features include:

· Developed on the Win7/10 platform.

· Integrates various dynamic test functions.

· For dynamic tests, arbitrary functional test waveform combinations can be defined to form test spectra and processes, enabling complex dynamic fatigue tests.

· For static tests, the software integrates major international and domestic standards for material testing, suitable for both research and routine process studies.

· Data collection, test steps, data storage, and test protection can be programmed as events to help users complete complex test operations.

8.3 Computer and Printer:

· Taiwan Advantech industrial computer.

· 24" LCD monitor.

· Windows 7 operating system.

· HP A4 laser printer.

9. Test Accessories:

· Tensile specimen accessories.

· Compression specimen accessories.

10. Spare Parts and Tools:

· Spare filter element （filter precision 3μ）: 1 piece, for replacement when the filter is clogged.

· Washing module solenoid valve: 1 piece.

· Specialized tools for the equipment: 1 set.