China Supplier Concentric Overburden Casing Drilling System with Ring Bits Permanent

China Supplier Concentric Overburden Casing Drilling System With Ring Bits PermanentGeneral IntroductionApplication Range:It is recommended to drill in rock formation where contains some ovals and fracture.Design Principles:The stabel and reliable working performance and the less vibration of drill rig.Different Structures:Concentric system with ring bits,with wings and with blocks.Operation Procedure1.when the drilling starts, the wings swing out, and reams to drive the casing shoes and tubes into the hole.2.When finished the drilling in overburden rock formations, reverse the drilling tools and the wings will get closed, and the drilling tools can be raised from the hole.3.Next construction can be followed.Raw MaterialSteel:first class special alloy steel with high strength, heat resistance and wearableCarbideThe best tungsten carbides from China are commonly applied.Tungsten carbide from European is also available.Specification1. Drill in overburden unstable rock. 2. One step to drill and follow casing 3. Flexible to open or close. 4. Long service life  The drill bit is the main tool of mining engineering impact drill, drilling and drilling machine parts is matched with the company, the product adopts the high quality alloy bit Zhuzhou hard alloy factory, the carcass quality 40Cr, 42CrMo and other materials Seiko production, to ensure the strength and toughness of drill bit. The company launched the conical connection hard alloy drill bit are straight and cross, three blade, ball gear and other four kinds of forms, many varieties and specificationsHammer PRODUCTTHREADMark2"inch Hammer  3"inch Hammer2 3/8 thread 4"inch Hammer2 3/8 thread 5"inch Hammer2 3/8 thread 6"inch Hammer3 1/2 thread 7"inch Hammer3 1/2 thread 8"inch Hammer4 1/2 thread 10"inch Hammer4 1/2 thread DTH drill bit 1, Drill bit of 2 inch Hammer  Ф76-80mm drill bitSide teeth,6/Φ14mm alloy. Φ81-90mm drill bitSide teeth,6/Φ14mm alloy. 2, Drill bit of 3 inch Hammer  Ф85-90mm drill bitSide teeth,6/Φ14mm alloy. Side teeth,6/Φ16mm alloy. Ф91-105mm drill bitSide teeth,6/Φ14mm alloy. Φ110mm drill bitSide teeth,7/Φ14mm alloy.Customized products, no after-sales3,Drill bit of 4 inch Hammer  Ф105-109mm drill bitSide teeth,6/Φ14mm alloy. Ф110-115mm drill bitSide teeth,7/Φ14mm alloy. Side teeth,7/Φ16mm alloy. Ф116-120mm drill bitSide teeth,8/Φ14mm alloy. Ф121-130mm drill bitSide teeth,8/Φ14mm alloy. Side teeth,8/Φ16mm alloy. Ф131-140mm drill bitSide teeth,8/Φ16mm alloy.Customized products, no after-salesФ141-150mm drill bitSide teeth,8/Φ18mm alloy.Customized products, no after-sales4,Drill bit of 5 inch Hammer   Ф132mm drill bitSide teeth,7/Φ16mm alloy. Ф133-140mm drill bitSide teeth,7/Φ18mm alloy. Side teeth,8/Φ16mm alloy. Side teeth,8/Φ18mm alloy. Ф144-146mm drill bitSide teeth,8/Φ18mm alloy. Ф147-152mm drill bitSide teeth,8/Φ18mm alloy. Ф153-165mm drill bitSide teeth,8/Φ18mm alloy.Customized products, no after-salesФ166-178mm drill bitSide teeth,8/Φ18mm alloy.Customized products, no after-salesФ179-190mm drill bitSide teeth,10/Φ18mm alloy.Customized products, no after-salesФ191-203mm drill bitSide teeth,10/Φ18mm alloy.Customized products, no after-salesФ204-216mm drill bitSide teeth,10/Φ18mm alloy.Customized products, no after-sales5,Drill bit of 6 inch Hammer   Ф152-165mm drill bitSide teeth,Φ18mm alloy. Ф166-180mm drill bitSide teeth,Φ18mm alloy. Ф181-190mm drill bitSide teeth,Φ18mm alloy. Ф191-203mm drill bitSide teeth,Φ18mm alloy.Customized products, no after-salesФ204-219mm drill bitSide teeth,Φ18mm alloy.Customized products, no after-salesФ220-235mm drill bitSide teeth,Φ18mm alloy.Customized products, no after-salesФ236-254mm drill bitSide teeth,Φ18mm alloy.Customized products, no after-sales6,Drill bit of 7 inch Hammer   Ф180-190mm drill bitSide teeth,9/Φ18mm alloy. Ф191-195mm drill bitSide teeth,9/Φ18mm alloy. Ф196-203mm drill bitSide teeth,10/Φ18mm alloy. Ф204-219mm drill bitSide teeth,10/Φ18mm alloy.Customized products, no after-salesФ220-235mm drill bitSide teeth,12/Φ18mm alloy.Customized products, no after-salesФ236-254mm drill bitSide teeth,12/Φ18mm alloy.Customized products, no after-sales7,Drill bit of 8 inch Hammer   Ф195-203mm drill bitSide teeth,10/Φ18mm alloy. Side teeth,10/Φ19mm alloy. Ф204-219mm drill bitSide teeth,10/Φ18mm alloy. Side teeth,10/Φ19mm alloy. Ф220-235mm drill bitSide teeth,12/Φ18mm alloy. Ф236-245mm drill bitSide teeth,12/Φ18mm alloy. Ф246-254mm drill bitSide teeth,12/Φ18mm alloy.Customized products, no after-salesФ255-275mm drill bitSide teeth,12/Φ18mm alloy.Customized products, no after-salesФ276-305mm drill bitSide teeth,15/Φ18mm alloy.Customized products, no after-salesФ306-325mm drill bitSide teeth,15/Φ18mm alloy.Customized products, no after-salesФ326-350mm drill bitSide teeth,16/Φ18mm alloy.Customized products, no after-sales8,Drill bit of 10 inch Hammer   Ф240-254mm drill bitSide teeth,12/Φ18mm alloy . Ф255-275mm drill bitSide teeth,12/Φ18mm alloy. Ф276-290mm drill bitSide teeth,15/Φ18mm alloy. Ф291-305mm dri