ZC High precision Lorawan wireless tilt sensor helps China's high speed train

Researched and developed by ZC Technology

In recent years, China's high-speed railway has achieved rapid development under the high attention and vigorous promotion of the Chinese government. At present, the operating mileage of China's high-speed rail exceeds 22000 km, accounting for more than 60% of the world's high-speed rail mileage, ranking first in the world. It is equipped with more than 2700 EMUs, and more than 4500 EMU trains are operated in China every day. The high-speed railway and EMU send more than 5 million passengers a day, accounting for more than 50% of the total passenger volume of the railway. Since the operation of China's high-speed railway for ten years, it has safely transported more than 7 billion passengers, which has become a shining "national card". It is estimated that by 2020, China's rapid passenger transport network with high-speed rail as the backbone will have an operating mileage of more than 50000 km, covering 80% of the cities with a population of more than 500000. China has become the country with the largest construction and operation scale of high-speed railway, the most complex technology, the fastest operation speed and the most advanced management in the world.

Based on years of experience in scientific research, test and operation and maintenance, China Railway Corporation has established a safety guarantee system throughout the whole life cycle of high-speed railway system. The safety, reliability, availability and maintainability of high-speed railway system are ensured through a series of work, such as feasibility study report review, design review and evaluation, equipment supervision, engineering supervision, static / dynamic acceptance, preliminary acceptance, safety assessment before operation, safety inspection and supervision during operation, etc.

Not long ago, Shanghai Zhichuan Electronic Tech Co., Ltd receivers the tunnel high-speed rail slab tilt monitoring project from the Academy of Railway Sciences Group Co., Ltd. ( abbreviated as Academy of Railway Sciences) . The project is located in Qinghai Province, with an altitude of over 3000 meters. The mountain tunnel is 4 km long. There is a chamber in the tunnel, with two tracks up and down. The project is to carry out automatic level monitoring of rail plate. Once the rail plate tilts beyond the preset alarm angle, the sensor can alarm in real time, and the owner can know, maintain and investigate in time.

The function of the project is specific, but there are many difficulties. They are :

1. The project is located inside the tunnel without signal. How to realize wireless communication is the primary problem.

2. The project requires data privatization, and access to external systems is not allowed.

3.The project environment is complex. There will be strong interference when high-speed railway passes through, so it is necessary to avoid false alarm and realize accurate alarm

ZCT330M-SWP-L is a LoRaWAN inclinometer developed and produced by Shanghai Zhichuan Electronic Tech Co., Ltd ., with a maximum measurement range of ± 30 ° for two axes, resolution of 0.001 °, accuracy of ± 0.005 ° and alarm threshold of 0.01 ° to 30 ° adjustable. And the alarm delay is adjustable from 0.3s to 25.5s, which can effectively shield the interference. The product adopts standard lorawan protocol and realizes wireless communication with gateway. LoRaWAN is an open standard, which defines the communication protocol of LPWAN technology based on LoRa chip. Its advantages are: simpler tracking and better public network.

In order to solve the signal problem, Zhichuan technology has provided LoRaWAN gateway and server to customers. After the tilt angle data is transmitted to the gateway, the data is uploaded to the equipped server through cable. Then, the server will be connected to the railway intranet and directly to the user monitoring platform.

Under the guidance of one country's "one belt, one road" policy and great development of China's high-speed rail, We really need a comprehensive and logical safety monitoring system. Zhichuan clearly recognizes this responsibility and obligation, will continue to improve quality, develop more practical products, and contribute his wisdom and strength to the safety monitoring of China's high-speed rail.