Abstract:

Abstract: At present, the PDC anchor drill bit which is for the coal mine roadway support is mostly two symmetrical types with center nozzle. This article which embarks from the structure of PDC anchor drill bits designed a new type of PDC bit. This kind of the bit has the following advantages, firstly the contact area between the PDC and the bit steal body is increased then the welding strength is improved; secondly the situation of the center nozzle closed is avoided; thirdly the bit has better integrality, more simple structure and easier to product. This kind of the PDC straight flute anchor drill bits are used in luling coal mine which belongs to the Huaibei mining group, the service life of the bit increased by 23%.

Key words: Key words: straight flute, Polycrystalline Diamond Compact, anchor drill bit