我队钻探施工,过去都是使用普通提引器(窄护圈)。操作时要旋转护圈,使护圈里侧的销子槽对准提引器体上的长销子,把护圈升高后才能摘掉提引器或者挂进提引器。每摘挂一次提引器要旋转护圈对销子槽二次,而且销子槽在护圈里侧,不好观察,不容易对正长 My team drilling construction, in the past are using ordinary lifting device (narrow guard ring). Rotate the retainer during operation so that the pin groove in the retainer is aligned with the long pin on the extractor body and lift the retainer to remove the extractor or hook the extractor. Each pick a lift to lift the retainer to the pin slot on the second, and the pin slot in the retainer inside, not good observation, not easy to positive length