简述了管端收口机液压系统的设计与调试过程，并总结了设计中二通插装阀的使用经验。

The design and commissioning of the hydraulic system for tube necking-in machines are briefed and some experience in using cartridge valves is summarized.

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一种碳纤维与金属结合螺纹管式脚踏车架，车架是由数根支杆、衔接头及二通接头构成。

The utility model relates to a thread tube bicycle frame made of carbon fibers combined with metal, which is composed of a plurality of supporting rods, an engaging head, and a two-way joint.

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