Overcome the problem of high-speed rail detection! Jinan Liling introduced PWS-300 30-ton rubber rail gasket fatigue testing machine.

Recently, the PWS-300 30-ton fatigue testing machine for rubber under-rail gasket independently developed by Jinan Liling Testing Machine Co., Ltd. completed a complete set of debugging and standardized verification, and was officially launched for rail transit detection, scientific research institutions and engineering quality inspection institutions. The equipment strictly meets the full set of industry standards for standard high-speed rail fasteners, and can complete the static and dynamic mechanical performance testing of the under-rail pad and the high-speed rail fastener system in one stop, and fill in the shortcomings of the refined and localized fatigue testing equipment for rubber components of domestic large-tonnage rail transit, providing high-precision test support for the safety and quality control of high-speed rail tracks.
Under-rail gaskets and fasteners of high-speed railway are the core components to ensure the smooth operation of the train and buffer the vibration load. They bear the reciprocating alternating load for a long time, and their fatigue life, dynamic and static stiffness, longitudinal resistance and other indicators directly determine the safety of track service. Previously, there were many pain points in the large-tonnage special fatigue testing equipment in the industry, such as insufficient accuracy, single working condition adaptation and low standardization, which made it difficult to meet the testing requirements of TB/T series high-speed rail fasteners. Jinan Liling R&D team integrates the advanced technology of electro-hydraulic servo dynamic testing machine at home and abroad, adopts the design idea of unitization, modularization and standardization, and independently tackles the four core modules of main frame, servo actuation, closed-loop control and hydraulic power to build this special 30-ton fatigue testing equipment.
The main machine of the equipment adopts a four-column portal frame structure with hard chrome plating on the surface of the columns and double hydraulic cylinders to lift and lock the beam, which has high overall rigidity, good specimen alignment and convenient clamping and maintenance. The core servo linear actuator is equipped with a symmetrical four-way servo valve control structure, adopts a high-speed sealing assembly imported from Germany, has a built-in LVDT displacement sensor, and is matched with an external high-precision German Mie extensometer to realize double high-precision synchronous acquisition of force and displacement; The maximum static and dynamic test force can reach ±300kN, the actuator amplitude is ±75mm, the test frequency covers 0.01–20 Hz, the force control accuracy is 0.5%, the displacement indication accuracy is ±0.5% FS, and the dynamic load fluctuation is not more than 1% fs, which fully meets the requirements of high-precision dynamic fatigue test.
The power system is equipped with a 40L/min, 21Mpa constant pressure servo pump station, which adopts a fully enclosed oil tank, a low noise variable oil pump and a water cooling system, and is equipped with multiple safety alarm protection for oil temperature, liquid level and filter element blockage. The hydraulic pipelines are all made of American Parker high-pressure pipe fittings to prevent leakage. Air-cooled water chillers can be selected to realize intelligent automatic temperature control of hydraulic system and adapt to long-term uninterrupted fatigue test conditions.
The control system is equipped with a self-developed digital single-channel DSP servo controller and special rail transit test software, which supports various loading waveforms such as sine, triangle and random wave, and can freely switch three closed-loop control modes of force, displacement and deformation. The closed-loop control frequency is 10kHz, and the load-deformation curve can be automatically collected, stored and drawn, and the test report meeting the national standard and railway industry standard can be output with one key. The equipment can complete a complete set of standard tests such as fastener assembly buckle pressure, rail longitudinal resistance, static/dynamic stiffness, long-term fatigue, pull-out resistance of embedded parts, etc. After changing the tooling, it can also expand the general mechanical tests such as concrete components, steel strands, anchors, etc., which greatly reduces the procurement cost of laboratory equipment.
On the standard adaptation level, the whole machine is designed with a complete set of test methods for high-speed rail fasteners such as JB/T9397, JB/T8286, GB/T2611 and TB/T3396. The hardware structure, loading logic, data algorithm and report template are all in line with the rail transit inspection specifications, and can be directly used for the factory inspection of third-party quality inspection laboratories, railway engineering research institutes and rail parts manufacturers. The whole set of equipment includes the main engine, servo actuator, servo pump station, digital control system, special fixture for under-rail pad, displacement extensometer, etc. The installation and debugging process is standardized, and it can run stably at room temperature of 5-45℃.
The person in charge of Jinan Liling Technology said that the landing of PWS-300 testing machine is an important achievement for enterprises to deeply cultivate the field of rail transit mechanics testing equipment. The core hydraulic, sensing and control components of the equipment take into account domestic self-control and international first-line matching, balance equipment accuracy and procurement operation and maintenance costs, and effectively break the import dependence of high-end rail fatigue test equipment. In the next step, the enterprise will continue to optimize the intelligent function of equipment, expand the coupled fatigue module of high and low temperature environment, and launch a series of special testing equipment for high-speed rail, urban rail and heavy-haul railway to help upgrade the quality testing system of domestic rail transit infrastructure.
keyword
Electro-hydraulic servo fatigue testing machine; 30-ton rubber rail gasket fatigue testing machine; PWS-300； High-speed rail fastener detection; Mechanical test of under-rail pad; Dynamic and static stiffness test; Laboratory of Rail Transit Mechanics; Jinan force collar testing machine