Today, taking the high-speed rail has become the first choice for many people to travel. The rapid development of urban rail and high-speed railways urgently requires the independent localization of vehicles and their key components, and the door is one of the key components.

At the recent Jiangsu Science and Technology Awards Conference, Nanjing Connie Electromechanical Co., Ltd. (hereinafter referred to as Connie) and Nanjing Institute of Engineering collaborated on the project “Key Technology Development and Application of High-Speed Train Door System”, which was awarded Jiangsu Science First prize for technology.

At present, more than 80% of the doors on the “Revival” trains are jointly developed by them. From “the first door of the subway” to “the first door of the high-speed rail”, “Connegate” has a global market share of 32% in the rail car door, ranking first in the world for three consecutive years.

A little innovation changes the car door ill

Urban rail transit doors have long relied on imports as an important component. Previously, foreign companies applied for nearly 700 patents in the field of door systems using decades of technical barriers, and built a patent-protected pool that was impenetrable, which led to market monopoly by virtue of technological monopoly.

Domestic rail vehicles are often in full-load operation. Under normal circumstances, the failure of the door must account for about 30% of the vehicle's operating failure. The serious failure of the door will cause the train to stop or even endanger passenger safety.

The train door is also known as the sliding door, mainly because the door has two actions of plugging and pulling. That is, when the door is closed, it is inserted into the door of the vehicle or the outside of the vehicle to close and seal; when the door is opened, when the door is moved away from the door by a certain distance, it can slide inside or outside the vehicle body.

The "closed door" of the sliding door has always been a difficult problem for the train door to overcome. Ordinary sliding doors (doors that connect the pulleys to the pulleys and move on the fixed rails) are easy to install, ensuring that the obstacle detection is normal even when the passengers are crowded. However, the sliding door is different. When the passengers in the compartment are crowded, when the sliding door is closed to the last distance, the door panel must move into the compartment at the same time, and the pressing force is generated on the human body. The door panel is overreacted by the passenger body resistance. , the obstacle detection of the automatic door detection system will be activated, so that the closing action cannot be realized in time.

To this end, Connie's R&D personnel developed a new type of micro-motion sliding door that combines the advantages of sliding door and sliding door. By reducing the sliding distance of the sliding door, the crowded passengers in the vehicle are greatly reduced on the door panel. Human body resistance; changed the force state of the closing process and reduced the lead angle.

The rail transit door system involves many technologies. In addition to the problem of the sliding door, the Connegate system used to be open and closed in the real-time test of the Shanghai Metro vehicle. The project general contractor Siemens asked Connie within 3 months. Solve, otherwise switch to other enterprise products. Either "close" the subway door or sell the company closed. This is a transcendental innovation that has been “forced”.

At that time, Kang Xiang, chief engineer of Connie Electromechanical, associated with the principle of the jack. The opening and closing of the subway door was also realized by the screw rotation to drive the nut linked with the door, but the screw pitch was large and could not achieve self-locking. Only. If the screw pitch is made smaller at the position where the door is closed, it can "lock the door" like a jack. In the end, this "unlocked and closed" invention patent has become the international mainstream technology of today's urban railroad locks, forming a reverse patent restriction on foreign companies.

Today, more than 200,000 sets of Connie subway doors are installed in nearly 100 subway lines in Beijing, Shanghai, Guangzhou, Nanjing, etc., realizing the independent localization of the Chinese subway door system.

Conquering the high-speed rail door "three high and one no"

"In 2007, the high-speed rail 'Harmony' was opened, but the core technology and market of high-speed doors were completely monopolized by foreign companies, and the doors were all imported." Shi Xiang still remembers the situation more than ten years ago.

"The development of high-speed rail train doors has four major difficulties - referred to as 'three high and one no.'" Shi Xiang told reporters that "three high" refers to high aerodynamic load, high cold and strong wind sand, high-intensity electromagnetic interference, "one without" It means that the design theory, test evaluation system and standards of the doors with a speed of up to 350 km are still blank in the world. The research and development team has been engaged in technical research for more than ten years, and the four difficulties of the high-speed door system have been solved one by one.

According to Shi Xiang, the high aerodynamic load brought by the train during high-speed operation will cause the door to seal failure and the door to fall off. In this regard, they invented the door with a new type of motion mechanism and sealing technology, using the body to restrain the balance of the aerodynamic load, to achieve the composite movement of the door, which not only prevents the door from being removed, but also strengthens the safety and air tightness of the door. The door has high sound insulation, lower noise inside the car, less stress fluctuations on the eardrum, and a significant increase in ride comfort.

In the winter, the cold at -40 °C in the north and the strong sand in the western region may cause the door to freeze and the failure of lubricating grease and the increase in door movement. "We skillfully utilized the lubrication function of the material 'graphite', invented the self-lubricating self-lubricating adaptive rolling screw drive and variable lead locking device, which realized the integration of transmission and locking, and solved the door movement caused by high cold. Blocking and strong wind sand cause the problem that fine sand enters the door system and cause increased wear, which improves the reliability and adaptability of the high-iron door." Shi Xiang said.

Finally, “one high” is the high-intensity electromagnetic interference of the EMU, which will cause the reliability of the door communication to decrease, resulting in abnormal opening. For high-intensity electromagnetic interference problems, R&D personnel have developed a new generation of high-security intelligent door controllers and remote intelligent operation and maintenance systems using Ethernet and redundant MVB composite networks and fault diagnosis technology. The door controller is certified by the highest international safety level SIL4 (10-8/h), and the safety level is increased by two orders of magnitude.

In response to “Nothing”, Nanjing Institute of Engineering edited the design monographs “Track Vehicle Door Design System” and “EMUs”, which formed the Chinese standard and established the only door test room and evaluation system in the industry that passed CNAS international certification.

“After a full decade, the doors of the revival’s first EMUs have all used Connie products with completely independent intellectual property rights. The doors on the high-speed rail “Harmony” have gradually been widely replaced by our products.