Electro-hydraulic Servo Fatigue Test Bench Laboratory Electrohydraulic Servo Compression Test Machine

• Customization: Available
• After-sales Service: 1 Year
• Warranty: 1 Year
• Model NO.: LS-P25
• Max Diameter of Workpiece: <500mm
• Mass Scope of Workpiece: 900kg
• Type: Testing Machine
• Maxcapacity: <1000KN
• Accuracy Grade: 1
• Load Way: Electronic Load
• Loading Method: Dynamic Load
• Display: Digital
• Control: Computer Control
• Weight: 100-500Kg
• Power Source: AC220V
• Oil Cylinder Position: Top
• brand name: LANGSHUO
• Power Supply: 220 V
• place of origin: Hunan, China
• Model: LS-P25
• Transport Package: /
• Specification: /
• Trademark: LANGSHUO
• Origin: Hunan, China
• HS Code: 9024800000
• Production Capacity: 200

Product Description

Electro-hydraulic Servo Fatigue Test Bench Laboratory Electrohydraulic Servo Compression Test Machine

I. Introduction

The LS-P25 electro-hydraulic servo fatigue testing machine is primarily used to test the dynamic and static mechanical properties of materials and components. It can perform mechanical property tests in tension, compression, bending, tension-tension, tension-compression, and compression-compression modes.  It can output waveforms such as sine waves, triangular waves, and square waves for low-cycle and high-cycle fatigue testing. Adding a WCOD crack extension system allows for crack propagation testing, and configuring a high-low temperature chamber enables high-low temperature mechanical property testing.

The development of the electro-hydraulic servo fatigue testing machine draws on the development and manufacturing experience of internationally renowned electro-hydraulic servo dynamic testing machine companies. It adopts a "modular, standardized" development concept, incorporating advanced international electro-hydraulic servo dynamic testing machine technology and designed in conjunction with the actual usage conditions of domestic users. Key components of the electro-hydraulic servo dynamic testing machine are selected from internationally and domestically renowned brands of similar products. This greatly improves the stability and reliability of the system. The key units and components of the system all use leading domestic and international brands. This series of products features ease of use, high control accuracy, and good reliability.

 

II. Product Composition:

The LS-P25 electro-hydraulic servo fatigue testing machine mainly consists of a main frame, a 225kN servo cylinder, an 18L/min adjustable pressure pump station, an oil source air cooling system, test fixtures, a hydraulic servo drive module, a crossbeam lifting drive module, a fully digital servo control system and testing software, a computer, a printer, etc.

See Figures 1 and 2 for the working principle diagram and control block diagram.

 

 

1. Main Machine:

The main machine is a two-column frame structure. The lower part is the base. Type A machines have a 25kN servo cylinder, hydraulic servo drive module, and crossbeam lifting drive module inside. Type B machines have the oil cylinder on the upper part of the crossbeam, selected according to the customer's testing requirements. The space between the table and the crossbeam is the test space. The size of the test space is adjusted by lifting and lowering the crossbeam. A displacement sensor is installed on the actuator piston rod to measure the actuator displacement (amplitude). A load sensor is installed below the crossbeam to measure the test force. The test fixtures below the sensor are replaced according to different tests. The crossbeam adjustment utilizes hydraulic lifting and a combination of hydraulic and mechanical locking mechanisms to ensure secure clamping of the crossbeam and more accurate test results. The testing machine main unit features smooth crossbeam lifting, high frame rigidity, convenient specimen installation, and excellent centering.

2. Servo Cylinder:

The servo cylinder is the core component of the testing machine, responsible for outputting test force and displacement. The cylinder barrel undergoes precision honing, and the piston rod undergoes surface hardening, super-precision grinding, and electroplating.  Imported seals, guide rings, and guide strips are used to ensure low friction, good sealing, fast dynamic response, and long service life. The servo valve is selected from the internationally renowned MOOG brand or the domestic brand Hangyu (HY).

3. Test Fixtures:

Tensile and compression fixtures are standard test fixtures. Bending and shear fixtures are also available, and special fixtures can be designed according to requirements.

4. Adjustable Pressure Pump Station:

The pump station has a cabinet-type structure, which is simple, elegant, and well-sealed. The pump station mainly consists of a frame, oil tank, oil pump motor unit, valve block, hydraulic components, pipelines, and cooling system, providing the hydraulic power source for the servo valve. The hydraulic pump station's output pressure is adjustable, and high and low pressures can be switched to meet the oil source supply requirements under different test conditions. The cooling system can be selected from water cooling, air cooling, and compressor refrigeration depending on the conditions.

5. Fully Digital Servo Controller:

The control system uses our company's fully digital dynamic hydraulic servo controller. Main configuration:

• DSP-based core control module supporting multi-channel closed-loop control;
• Signal conditioning unit with three sensors (force, displacement, deformation);
• Two-stage servo valve drive unit;
• Test control software specifically developed according to railway fastener testing standards;

6. Computer and Printer:

To ensure the reliability of the test, an Advantech industrial computer is used, and an HP brand printer is selected.
 

Electro-hydraulic Servo Fatigue Test Bench Laboratory Electrohydraulic Servo Compression Test Machine

III. Main Technical Performance Indicators:

1. Maximum static test force	±25kN, static indication accuracy: ±0.5% over the entire range;
2. Maximum dynamic test force	±25kN; dynamic fluctuation: no greater than ±1.5%;
3. Servo cylinder amplitude	maximum amplitude ±75mm;
4. Frequency range	0.01~50Hz;
5. Displacement measurement accuracy	±0.5% of indicated value;
6. Displacement measurement resolution	0.001mm;
7. Multi-segment function generator;
8. Counter	999,999,999, presettable;
9. Control modes	load, displacement, and deformation control modes; main test waveforms: supported by the controller (including sine wave, square wave, triangular wave, ramp wave, and external input waveforms);
10. Maximum test space	900mm (excluding fixtures);
11. Distance between columns	600mm;
12. Main unit dimensions	970mm (width) × 600mm (depth) × 2020mm (height) (subject to actual product);
13. Pump station dimensions	700mm (width) × 1150mm (depth) × 1070mm (height) (subject to actual product);
14. Hydraulic pump station	flow rate 18L/min, maximum pressure 25MPa, motor power 7.5kW.

 

IV. Main Configuration:

1. High-rigidity main machine frame (1 unit);

2. Soft-support, low-friction servo cylinder (1 unit);

3. High-precision spoke-type load cell (1 unit) (Transcell, USA; Bengbu Dayang), accuracy better than ±0.5%, overload capacity 150%;

4. Displacement sensor (1 unit) (Xiju KH-150), range ±75mm, accuracy ±0.5%;

5. Servo valve (1 unit) (Hangyu HY130);

6. Fatigue testing machine dedicated pump station (1 unit):

1). Oil source frame and oil tank (1 set);

2). Low-noise internal gear pump (1 unit) (Nachi IPH3B-13, Japan; Guangdong Juntian JG0-13);

3). Motor (1 unit) Y132M-4, power 7.5kW, speed 1440r/min (Shandong Shenghua);

4). Relief valve (1 unit), directional control valves (3 units) (Jinan Hengyang);

5). Oil filter (1 unit) (Wuxi, Jiangsu);

6). Accumulators (2 units) (Wuxi, Jiangsu);

7). Air cooler (1 unit) (Zibo, Shandong);

7. Fatigue testing machine control system and software (1 set)

 

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