Shield machine is a tunnel construction equipment that integrates machinery, electricity, hydraulics, optics, mechanics, pneumatics, sensing, information, and guidance, and can complete construction processes such as excavation, support, and slag removal and perform continuous operation in factory-like assembly lines.

The shield machine is known as the "king of construction machinery", and it is a major key equipment to measure the level of a country's equipment manufacturing level. With the comprehensive deployment of shield tunneling construction of urban subways, railway tunnels, highway tunnels, water conservancy engineering, municipal gas pipeline engineering, sewage pipeline engineering, heating and cooling pipeline engineering, and cable pipeline engineering in China, the total market demand for shield machines shows a rapid growth trend, which also brings a broad market to shield machine bearings.

The cutter head is a key component of the shield machine and plays an important role in the tunneling process. The main bearing in the cutter head system is the core part that transmits the driving power and motion, and bears huge axial force, overturning moment and certain radial force during work. The performance, life and reliability of the main bearing directly affect the construction progress, safety and excavation mileage of the shield machine. The main bearing of small-sized shield machine usually adopts four-point contact ball and crossed cylindrical roller structure, and some have double-row tapered roller structure. The main bearings of shield machine with large size mainly include three-row three-line cylindrical roller combined bearing and three-row four-line cylindrical roller combined bearing. Among them, the most commonly used three-row three-line cylindrical roller combined bearing can be divided into internal gear type and external gear type.

The main function of shield machine main bearing is to support and transmit motion and load. However, due to the extremely low speed, the huge load, and the extremely high reliability requirements of the shield machine, the main bearing of the shield machine bears great risks, and it also puts forward strict requirements for its design and manufacturing. Due to the heterogeneity of the geological structure, the size and direction of the tunneling resistance of the shield machine may change drastically, the main bearing of the shield machine often works under extreme conditions such as impact and eccentric load, and has strict requirements on the technical indicators such as bearing material and heat treatment, structure, rigidity, strength, life and reliability. In addition, it is also required that the main bearing installation part of the shield machine has a reliable seal, and the inside of the bearing has good lubrication. The sealing structure and lubricant need to be specially designed to meet the harsh environmental conditions.

ZYS supported bearings for China's the largest shield machine exported to Europe. If you have purchase needs of shield machine bearings, please contact us by email: sales@zys.com.cn.