High-end power plant torque and speed measurement equipment R & D passed acceptance

[China Instrument Network Instrument R&D] On December 1st, the “12th Five-Year” national major instrument special project “High-end Power Unit Torque and Velocity Measurement Instrumentation Equipment” was led by the China Institute of Metrology (hereinafter referred to as “China Measurement Institute”). The research and development and application of this technology was approved by experts from the Ministry of Science and Technology in the Changping District of China Metrology Institute.

Comprehensive acceptance of the project will be on-site photography: Chen Hanghang

The project established a set of scientific instruments including a 20 kN·m high-accuracy high-torque standard device, a dual-antenna radar velocimeter, and an accelerometer dynamic characteristic calibration device, and it overcomes key core technologies such as air bearing manufacturing and non-disturbing quality parameter measurement. It has greatly improved the key parameter measurement capabilities of high-end power installations in China, and provided a full set of solutions for the independent design, manufacturing and industrialization of core power components such as rail transit and high-end ships in China, and has achieved high-tech leadership in the related equipment manufacturing industry. Upgrade.

High-end power equipment is the heart of major technology equipment such as advanced transportation equipment, large-scale power generation equipment and precision processing machinery. It occupies a pivotal position in the equipment manufacturing industry. In order to ensure the power equipment's working ability, efficiency, operating life and safety, it is necessary to accurately measure the key parameters such as the torque, speed and other basic components of the drive shaft. At present, China's high-end power equipment in the design, manufacture of torque, speed and other key parameters of measurement still rely on imports of high-end equipment. This severely restricts the complete independent design and research and development of high-end trains such as high-speed train bogies, large ship propulsion systems, aero-engines, wind turbines and other high-end equipment. To this end, China Metrology Institute, with the support of major national instruments of the “Twelfth Five-Year Plan”, launched research and application research on relevant scientific instruments for the measurement of key parameters such as torque and speed for high-end power equipment.

According to project director Zhang Yue, director of the Institute of Mechanics and Acoustic Measurement at the China Institute of Metrology, a large ship is used as an example. The drive shaft of the propulsion system usually needs to withstand several tens of kilo-nillimeters of torque. When the ship is rapidly maneuvering, the instantaneous torque can be as high as tens of thousands of Nm. If the torque and speed cannot be measured and controlled quickly and with high accuracy, the transmission spindle will be damaged and the service life of the equipment will be reduced. In severe cases, the spindle can be directly damaged.

In 2012, on the basis of nearly forty years of torque measurement experience, China Metrology Institute has repeatedly demonstrated and proposed a design scheme for a 20 kN·m high-precision large-torque standard device based on a new type of structure.

“In order to reduce the frictional torque caused by the supporting parts and to improve the measurement accuracy, we chose to use hydrostatic air bearings instead of the traditional ones. However, the air bearing with a bearing capacity of up to 20 kN·m was not even available in Germany at that time. Processing capacity." Zhang Yue said.

To this end, China Metrology Institute and cooperation units have focused on the development of static air bearing manufacturing processes. After nearly 4 years of hard work, the project team has overcome the problems of material processing, geometric measurement, precision machining and assembly, and achieved independent development of large-size, ultra-high-precision, ultra-low friction torque air bearings, making China's air bearing manufacturing technology The level of comprehensively surpasses imported products, which not only has a high carrying capacity, a steady support state, but also is more energy-efficient.

In addition to reducing the uncertainty component introduced by the bearing support section, the device also takes full account of the uncertainty introduced by the components such as the arm and weight, and has developed a series of arm systems, suspension systems, and robots with independent intellectual property rights. Code loading system, twist mechanism and other precision machinery and measurement and control systems, and automatic control of the torque measurement process. In order to ensure the accurate traceability of the weight value, the project team also independently developed a set of high-accuracy and high-quality parameter measuring devices, which for the first time achieved accurate weighing of F1 grade weights of up to 2000 kg in China.

As of the acceptance of the project, the measurement range of the 20 kN·m high-precision large-torque standard device has reached 100 N·m~24 kN·m, the uncertainty is better than 0.002% (k=2), and the comprehensive technical index is leading internationally. The device extends the upper limit of measurement of the torque reference device in China from 5 kN·m to 24 kN·m, solving the problems of high-end power equipment tracking the magnitude of large torque, and breaking the core components such as large torque measuring instruments and air bearings. Reliance on imports has provided solutions and technical guarantees for the independent design and research and development of related equipment in China.

In addition, the project also successfully developed a dual-antenna radar speedometer and accelerometer dynamic characteristics calibration device for speed measurement range (20~350 km/h), which is an independent research and development and productization of China's high-speed railway capacity enhancement and domestic automobile airbag accelerometers. Provides important technical support.

At present, the large-scale parameter measuring device established by the project has served the energy efficiency analysis of the fuel cell-hydrogen battery of the National 863 Program. Air bearing, torque standard device and airbag accelerometer calibration device have also been formed for engineering and industrialization. Technical files will continue to drive the upgrading and innovation of China's related manufacturing industries.

(Original Title: China Measure Institute Breaks Through High-torque, Speed-measurement Key Technologies to Improve China's High-end Power Equipment R&D Capabilities and Manufacturing of Key Components)