The paper introduces the typical examples for resolving these problems by air-lift reverse circulation drilling technology.
介绍了应用气举反循环钻进工艺解决这些疑难技术问题的成功案例。
The key points of reversal installation, the lift system of oil tank, the gin pole using in reverse installation and chain block used in assembling gin poles and molding bed are discussed in detail.
尤其对倒装法的施工关键—油罐的提升系统 ，对倒装时用抱杆、组装抱杆与胎模时用倒链作了详细的叙述。
Atomatic thread trimmer, reverse-feed and presser foot lift.
采用自动剪线、倒缝、拨线提升压脚功能。
Atomatic thread trimmer, reverse-feed and presser foot lift.
采用自动剪线、倒缝、拨线提升压脚功能。
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