Because the shield tunneling machine (referred to as the shield machine) is equipped with a special air compressor, its working conditions have the characteristics of high tunnel temperature, high humidity, dust, vibration and other harsh tunneling features, and the machine size is required very small. The maintenance operation space is limited, so the operation and maintenance need to be convenient, and the equipment construction has extremely high requirements for gas source stability and cyclability. For the general factory screw air compressor can not fully meet the special requirements of the above working conditions, so the air compressors used in this industry need to be specially designed for the unique requirements; this series of products can be widely used in subway, tunnel construction, Municipal construction, road mining and other industries.