July 14，Major science and technology projects in Hunan Province led by Railway Construction Heavy Industry“Research and Application on Key Technologies of Intelligent Equipment for Super Underground Engineering”Passed comprehensive acceptance in Changsha。An expert group led by Gui Weihua, academician of the Chinese Academy of Engineering, commented that，This project has seized the technological commanding heights of the global underground engineering equipment industry.，The super underground engineering equipment developed has reached the international leading level as a whole.。

Roadheader is a complete set of intelligent equipment for underground engineering.“The king”，And the main bearing is for the roadheader.“ Heart ”。In the face of the heavy load of the roadheader、Large partial load、The test of extreme working conditions such as variable frequency load，Main bearing shall meet the requirements of high reliability、Key performance requirements such as long life，Its material、Design、Manufacturing and testing are extremely difficult.，It is at the top of the large-scale high-end precision bearing industry chain.，Listed as 35 items“Stuck in the neck”One of the key technologies of。Foreign countries monopolize it for a long time.，The core components of key equipment are controlled by others.。

In order to thoroughly implement Hunan Province“Three high and four new”Major strategic deployments and missions，Breakthroughs affect enterprises、Industry and even national construction and development“Stuck in the neck”Technology，Railway Construction Heavy Industry relies on major science and technology projects in Hunan Province，Actively respond to the call of the state，Give full play to the leading advantages of roadheader host enterprises，Brave to pick“Stuck in the neck”The important task of tackling key technical problems。During the period of the project, a series of domestic main bearings below 5 meters were successfully developed.，It has passed the working condition simulation test and site application verification of more than 10000 hours of equivalent life.，Highlights of product innovation，The application demonstration effect is remarkable.，Mass production has been achieved.，Received unanimous praise from the expert group。

During the project，Tiejian Heavy Industry has set up a research and development team headed by chief scientist Liu Feixiang.，Demonstrate the main advantages of enterprises in independently tackling key components，Have a definite object in view of the four key difficulties of the main bearings，Break them one by one：High-purity, long-life bearing steel developed by top steel plants in the United Nations，Break that fatigue life bottleneck of the traditional material of the main bearing.；The theory, method and special software for independent design of main bearing are constructed.，It breaks through the design theory and technology of large low-speed and heavy-duty bearings.；Superior enterprises in the United Nations have developed high efficiency.、High Precision Hard Gear Milling Technology，It breaks through the bottleneck of domestic large-scale high-end precision gear grinding technology and equipment.；Take the lead in carrying out the whole life simulation test verification of the main bearing，A main bear is formed“Design-Manufacture-Validate”A closed loop，Self-manufacturing of Main Bearings with Larger Diameter and Long Service Life to Boost Confidence。

“Chisel the road in every mountain，Bridge in water”。China Railway Construction Heavy Industry Co., Ltd. has overcome all difficulties，Find a new way，Establish a research and development system for key components of high-end underground engineering equipment，Breaking through the main bearing of the roadheader“Stuck in the neck”Take an important step in technology，It provides a strong guarantee for the safety of tunnel boring machine industry and the independent development of high quality.。

“Xiongguan Road is really like iron.，Now step forward from the beginning.”。A new starting point，A new journey，Railway Construction Heavy Industry will keep in mind the spirit of railway soldiers，Digitalization of Independent Development of Underground Engineering Equipment with Larger Diameter、Automation and intelligent technology launch a charge。