有一些不同的系统使用,根据岩石/沉积物和投资。在硬地层深钻粉,_[核心捕手][1]_ two-barrel系统中使用。corehead(钻头)连接到外桶,而核心是推进内桶。内桶的下部叫做_shoe_上方钻。的鞋,都有一个_core catcher_桶之间的楔形和核心。核心捕手的开口环有一个粗略的核心。当你把核心,它按下上下鞋子挤压麦田。核心捕手作品在某种程度上就像一个锚扩张,但倒,抓住核心筒的内部而不是外面的墙。内桶也保护的核心旋转外桶。软沉积物,核心捕手由弹簧关闭向内拉为核心。 It is sometimes called _[basket retainer][2]_ and can be in [metal][3] or [plastic][4]. For [smaller gravity corer][5], there is a valve on top of the tube that is closed and the underpressure in the tube holds the core in place. Sometimes... _Check the linked pictures, they probably explain better how it works._ [1]: https://www.researchgate.net/profile/Pavel_Talalay/publication/259099023/figure/fig14/AS:287278490107921@1445503937288/Fig-23-Split-ring-core-lifters-for-conventional-prospecting-drilling-Source.png [2]: http://image.made-in-china.com/43f34j00SygajEZnApkP/Nq-Basket-Retainer-Core-Spring.jpg [3]: https://www.google.com.au/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwiPhPjf-v_UAhXLgbwKHdcYAnMQjRwIBw&url=http%3A%2F%2Fgeoprobe.com%2Fsonic-dual-tube-60-sdt60&psig=AFQjCNFq2tBdoz9BoIl9p_rcw5sdcB9acA&ust=1499817861969807 [4]: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT5BkpxDpy6YNJ4CPtMxjavrbqhj2s2u6iUQ3pbOORhGbb7-D6e [5]: https://www.google.com.au/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwj7097b-__UAhVINbwKHdGtABsQjRwIBw&url=http%3A%2F%2Fpost.queensu.ca%2F~pearl%2Fcoring%2520instructionsmaxiG.htm&psig=AFQjCNHPp4DQSr_ZhEYINlFQ3qVCZCdq7w&ust=1499819105818932