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锥塞密封式半合管钻具——刘子如 (一) 抽筒取样的缺点用抽筒提出砂矿样品的工艺方法,目前已被广泛采用。其原理是借助于抽筒的自重,在套管里向下冲击(筒底阀门打开),使砂样冲入筒内;当抽筒在机械力作用下迅速上提时(阀门关闭),抽筒在套管中产生类似于活塞的抽吸作用,使其下部的砂矿样被吸起一定高度(如图1a所示),之后,又重复向下冲击动运,这时被抛起的砂矿样(带水)涌入抽筒阀门(如图1b所示),达到样取目的。但是,由于砂矿中各种矿物的比重不同,如石英砂一般在2.7左右,重砂矿物的比重多在3
Conical plug semi-closed pipe drill - Liu Ziru (A) the shortcomings of the sampling tube Sampling of sand with a sample of the process, has been widely used. The principle is based on the weight of the barrel, the casing in the downward impact (the bottom of the cylinder valve is opened), the sand sample into the barrel; when the barrel under the mechanical force quickly on the lift (the valve is closed), pumping The tube creates a suction effect similar to that of the piston in the casing, causing the sand sample in the lower part of the tube to be sucked up to a certain height (as shown in Fig. 1a), after which the impact is repeated downwards and tumbling Sand samples (with water) into the barrel valve (Figure 1b), to achieve the purpose of sampling. However, due to the different proportion of various minerals in the sand, such as quartz sand is generally around 2.7, the proportion of heavy sand minerals in more than 3