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目前,矿井开拓、掘进工程支护方式多为锚杆支护,尤其是在生产矿井回采巷道工程量中,占有相当大的比例。锚杆是用锚固剂与煤帮固定在一起.绝大多数锚杆不能回收利用,如粜能够把回采巷道的锚杆全部回收重复利用,将给矿井节省大量的材料费用。另外,巷道帮部的锚杆如不提前回收,采煤时综采机遇到金属锚杆,容易损坏刀刃。为解决上述问题,车集煤矿生产技术科设计制造出与煤电钻配合使用的空心螺纹钻杆——锚杆凹收器。1设计技术方案此产品由空心钻头1和空心麻花钻杆2组成,空心麻花钻杆2内径略大于锚杆直径,钻杆尾端有一连接卡3,用于与煤电钻连接。如果锚杆锚固段直径与锚杆直径相差较大,可将空心麻花钻杆2的内孔加工成内径大小不同的两段,即前段直径大于后段直径。该锚杆回收器结构见图1。
At present, most of the ways of mine excavation and excavation support are bolt support, especially in the engineering volume of mine production roadway, occupying a large proportion. Bolt is anchored with coal gang together. Most of the anchor can not be recycled, such as 粜 can recover all the bolt back to the roadway for reuse, will save a lot of material costs for the mine. In addition, the roadway gang of the bolt if not early recovery, coal mining mechanized mining opportunities when the metal bolt, easy to damage the blade. In order to solve the above problems, Cheju Coal Mine Production Technology Branch designs and manufactures a hollow threaded drill rod - bolt retractor for use with a coal drill. 1 Design of technical solutions This product consists of a hollow drill bit 1 and a hollow twist drill rod 2, the hollow twist drill rod 2 slightly larger diameter than the diameter of the anchor rod, the drill rod has a connection card 3 at the end for connection with the coal drill. If the anchor bolt diameter and anchor bolt diameter difference between a larger, can be hollow drill twist drill hole 2 into two different sizes, namely, the anterior segment diameter greater than the posterior segment diameter. The bolt recovery structure shown in Figure 1.