It is understood that because the products of the local drying equipment companies do not have enough trust, they often run into the wall during the use of the business, and face the threat of being rejected. At the same time, they have been asked to join the company when signing the delivery contract with the end user: “Resolutely Do not use domestic basic accessories." As one of the basic industries of domestic drying equipment products, but in large-scale mainframe manufacturing has repeatedly suffered from eye-shaking and cold encounter, resulting in the survival of the relevant drying equipment companies have difficulties. And the drying equipment manufacturing industry does not need to use the domestically-manufactured numerical control system “China Coreâ€. This large-scale manufacturing CNC machine tool does not use the domestic hydraulic system, and is almost entirely imported from abroad. The hydraulic system for the major domestic drying equipment for shield machines is also basically imported. In spite of repeated orders from national relevant departments, many meetings and conferences were held to call for users to use domestically-made accessories, but end-users still refuse to use domestic hydraulic systems. The only requirement for manufacturers is that “there is no domestic productâ€. According to expert analysis, China's drying equipment manufacturing industry has developed rapidly, but the main reason that the supporting of basic components can't keep up with lies in the long-term domestic "re-hosting and light matching." Compared with the development needs of the dryer equipment industry and the world's advanced level, the gap between the infrastructure components is really great. The difference lies in the product variety, performance and reliability. Due to relatively low industry barriers, China's hydraulic, pneumatic, and sealed drying equipment companies are small, weak, scattered, and chaotic. They are in the “Spring and Autumn and Warring States Periods.†Coupled with weak R&D capabilities, industry concentration is too small, and industry leaders are lacking. Drying equipment companies cannot participate in global competition and can only produce low-end products.