On June 3, 2026, information from the State Intellectual Property Office showed that Qinchuan Machine Tool Group Co., Ltd. applied for a patent titled “Remanufacturing grinding wheel spindle components for gear grinding machines and their assembly process methods.”
The application publication number is CN122099990A, the application number is CN202610563641.0, the application publication date is May 29, 2026, and the application date is April 27, 2026.
The patent summary shows that the invention belongs to the field of machine tool remanufacturing technology.
The spindle component adopts a direct drive structure of a synchronous motor and a grinding wheel spindle; the grinding wheel spindle is supported by high-precision angular contact ball bearings at the front and rear ends. The front end is equipped with a multiple sealing structure of labyrinth seal + air seal + seal stack ring + spacer ring. An incremental rotary encoder is installed at the rear end to achieve full closed-loop control. It is also equipped with a built-in grinding wheel dynamic balancing device with AE function, an automatic turning mechanism for the grinding wheel cover, and an elastic unloading groove at the short cone surface of the grinding wheel flange.
Its assembly process includes four core steps: parts preprocessing, direct drive structure thermal assembly, support structure assembly, and functional component assembly.
This invention significantly improves the spindle speed, grinding efficiency, support rigidity and automation level, effectively ensures the long-term stability of gear grinding accuracy, and perfectly meets the low-cost, high-performance remanufacturing and upgrading needs of old CNC gear grinding machines.
Qinchuan Machine Tool was established on July 10, 1998 and listed on the Shenzhen Stock Exchange on September 28 of the same year. It is a leading enterprise in the field of domestic machine tools. Its core business focuses on high-end machine tools and complex cutting tools, and has differentiated advantages across the entire industry chain.
In 2025, Qinchuan Machine Tool’s operating income will reach 4.09 billion yuan, ranking first among 19 companies in the industry, far exceeding the industry average of 1.538 billion yuan and the median of 1.073 billion yuan.
Among its main businesses, machine tool revenue is 2.064 billion yuan, accounting for 50.48%; parts and components revenue is 1.472 billion yuan, accounting for 35.99%.
In terms of net profit, it will be 59.518 million yuan in 2025, ranking 10th in the industry.
In addition, Qinchuan Machine Tool Group Co., Ltd. has a number of patents recently.
For example, there are many invention patents such as “A magnetically suspended gas static pressure CNC turntable and its control method” and “A multifunctional worm turning device”, as well as appearance patents and various utility model patents such as “Milling and turning combined machining center (VMT series – vertical)”, “Turn and milling combined machining center (VTM series – gantry type)”.
These patents cover multiple fields of machine tool manufacturing, reflect Qinchuan Machine Tool’s continuous investment and innovation capabilities in technology research and development, provide it with strong technical support in market competition, and also contribute to the development of China’s machine tool manufacturing industry.
