A rotation drill rig, air compressor and the "DTH drill string" are the essential unit for DTH drilling while the "DTH drill string" is always made up of DTH drill rods, DTH hammer and DTH bits. As one of key component, the DTH hammer acts as a role of converting the air pressure to the impact energy, simultaneously transferring impact energy and rotation force to DTH bits.
The optimum range of hole size for blast hole drilling with DTH is 90 mm to 254 mm (3 -10). Smaller blast holes are generally drilled using tophammer, and larger holes generally use rotary machines.
In other applications, like foundation drilling, DTH hammers can be used with single bit in hole sizes up to . 750 mm (30). With multiple hammer units CD (Cluster drills) drill holes up to 70 or 1778 mm.
As a rule of thumb, the smallest hole diameter a DTH hammer can drill is its nominal size. A 4 inch hammer will drill a 4 inch (102 mm) hole. The limiting factor is the outside diameter of the hammer, because, as hole diameter reduces, airflow is restricted. Maximum hole size for production drilling is the nominal hammer size plus 1 inch, so for a 4 inch hammer the maximum hole size is 5 inch (127-130 mm).
Choosing the right hammer is largely determined by hole size and type of rock formation. Ideally, the size of the hammer should match the required hole dimension as closely as possible, leaving just enough space for cuttings to evacuate the hole.
Supplier: Activated Carbon, Aluminium Hydroxide, Aluminium Sulphate, Calcium Hypochlorite, Caustic Soda, Cetyl Stearyl Alcohol, Citric Acid, Cocoa Powder, Corn/Maize Starch, Corrosion Inhibitor, Dextrose Monohydrate, Ferric Chloride, Ferro/Silico Manganese, Glacial Acetic Acid, Glycerin, Hydrated Lime, Liquid Chlorine Gas, MIBC, Phosphoric Acid 85%, PAC, Poly Vinyl Acetate, Polyelectrolyte, Polymer, Refined Glycerine, Soap Noodles, Soda Ash, Sodium Sulphate, Soya Lecithin, Sulphur Granular, Sulphuric Acid 98%, Talofloc, Taloflot, Titanium Dioxide, Urea Formaldehyde Resins, Xanthate. Beans, Chickpeas, Lentils, Maize, Millet, Pulses, Rice, Sesame Seeds, Sorghum, Soya Meal, Turmeric. Motors, Aluminium/Copper Wire Rods, Automation & PLC, Cable Accessories, CR/HR/Galvanized Steel, Conveyor Belts, Energy Meters, Generators, BESS Tenders, HMS/LMS Scrap, Industrial/Mining Equipment, Perforated/Structural Steel, Pumps, Sensors, Steel Coils/Pipes/Sheets, Transformers, Water Meters, Wires & Cables.
Supplier: Construction equipment (home improvement, electrical supply, pipes and fitting etc..), heavy machinery: mining equipment, excavator, drilling, and so on
paper and packaging, production line: kraft paper, plastic and paper box, aluminum foil, plastic wrap, boxes, paper cups, take a way box and so on..
renewable energy: solar panels, inverter, photovoltaic chemical and raw material: soda ash, titanium, pe, ppe
Services: Our company hangzhou xing ying technology co., ltd.(astrioglobal) also provides exporting, quality control, international logistics and consulting/negotiation.
