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Rock bolts are one of the support systems, that are widely used support systems in mining and various civil engineering operations. Rock bolts or anchors play a very important role as systematic support during the excavation stage of tunneling or mining work, the bolts can go into the roof of underground mines or the walls of tunnels to prevent caving. The anchor bolts reinforce the loose and weak strata to make them, self-supportive by enhancing their inherent strength. Anchoring of the rock bolt plays an important role when the deformation or movement of the layers in the rock mass induces axial tensile load in the installed rock bolts. Their purpose is to improve the resistance of the ground. Bolts will fail if the applied or induced axial load to the bolt exceeds the anchorage strength. Anchorage strength depends on many factors such as type of bolt, annular space, grouting media, shear behavior at the bolt-grout interface, surface profile, installation mechanism and position. The stability of structures in any tunneling and mining excavation is critical and roof rock stability has long been the primary concern in all underground excavations. Rock bolting has been successfully utilized worldwide for excavation support and slope stabilization and its use continues to grow rapidly. A single use drill bit, selected to suit the ground condition, is fitted to the leading end of the hollow bar ( also called Self-Drilling Anchors)with an anchor plate and anchor nut fitted on the trailing end. Couplings can be used to combine hollow bar sections for extension bolting. What are purposes of Rock bolts installed? 1. Provide pre-tension in fragile geology conditions;2. Serves as a mortar bolt for passive loading. For the pre-tension purpose, immediate anchoring of rock bolts with loose rock geology is necessary. Rock bolting carries the

A: Enough space for cuttings to evacuate the hole efficiently; B: High-performance design for harsh and abrasive conditions formations; C: Components Replace Easy to Save Drill Cost; D: Choose Right DTH Drill Rods; E: Choose Right Friction-welded joints; A: Enough space for cuttings to evacuate the hole efficiently: As experienced, the smallest hole diameter a DTH hammer can drill is its nominal size. i.e. standard 102 mm (4 inches) hammer will drill a hole down to a minimum diameter of 102 mm (4 inches). The limiting factor is the outside diameter of the hammer dth, because as the hole diameter reduces due to diameter wear of the dth hammer bit, airflow is restricted. Maximum hole size for production drilling is the nominal hammer size plus 25 mm (1 inch), so for a 102 mm (4 inches) hammer the maximum hole size is 127-130 mm (5 inches). The right drill bits are determined by the type of application, hole size, and type of rock formation, the size of the hammer DTH should match the required hole dimension as closely as possible, leaving just enough space for cuttings to evacuate the hole efficiently. B: High-performance designed DTH Rock Tools for harsh and abrasive conditions formations: VD DRILL DTH hammers are purpose-matched for all rock types and applications where high performance and low total cost per drill meter are the main criteria. ) VD Drill’s DTH Hammer with a common design is a suitable choice for dth drilling in quarries, shallow water well drilling, and underground blast hole drilling. ) VD Drill’s standard DTH hammer is the optimum selection for demanding conditions in abrasive formations. It has the same internal components as the common design, but with larger OD of the drive chuck and wear sleeve. These also protect the top

Operation Instruction Put DTH Hammer on the Bench Adjust the position of DTH Hammer and wrench; use a wrench to block the top subside of the hammer; let the wrench and jack in the same face. Fix K-Shaped base with a nut. Fix wrench with nuts. Shake handle of Jack slowly till the top sub away from hammer After the top sub is dismantled, release hydraulic oil pressure in the jack, release nuts, discharge the K-shaped base and turn around the Hammer. The part of the external cylinder thread is prohibited to wrap by the jaw to avoid any damage to the hammer dth. Adjust the position of hammer and wrench; use a wrench to block the drive bit of the hammer; let the wrench and jack in the same face. Fix hammer Fix K-Shaped base and the wrench with the nut. Shake handle of Jack slowly till dive chuck away from hammer dth.     For more about DTH Hammer Hydraulic Manual Breakout Bench Please read How to avoid DTH Bits loss in the hole with DTH Hammer Hydraulic Manual Breakout Bench : https://drillbitsupplier.com/how-to-avoid-dth-bits-loss-in-the-hole/   More information please contact our Expert or ask for a quote.

 Improve Threaded Design Keep Borehole Open Adopt DTH Hammer Breakout Bench Choose Right Thread Lubrication When the driller use drill rigs to drill holes, he runs the risk of loosing his dth drilling tooling, it is very important for DTH rock drill tools with suitable design, especially in thread design. Improve Threaded Design: If the threads are fixed design may be hard to unscrew, if for simple design, they may become unscrewed in the hole with the loss of dth button bits and retaining rings. VD Drill manufacturer adopt the 3-start thread design for bit dth, where there will be 3 threads following each other, instead of just the one that is common on a simple bolt and nut. Keep Borehole Open: The 3-start thread makes it easier to unscrew components and if the pitch is right then it is less likely to become unscrewed in the hole, although this can happen in soft ground conditions, may be made up of broken or fissured rock, clays, sands or damp heavy conditions where dust can cling to the wall of the hole. – usually as the driller attempts to clear a blocked hole, Naturally it is important to keep the borehole open during the dth drilling process. To keep DTH Tools with good effect without loss, there are two further ways below: Adopt DTH Hammer Breakout Bench: Even with a 3-start thread arrangement, the tool that has been on the rig for a time or has been used in the difficult ground with a powerful drill rig is likely to have screwed up so tight that it is nigh impossible to loosen it, therefore, change DTH bit or Strip the DTH Hammer Bit only to find that it cannot be dismantled without extreme difficulty. Then Drillers then resort to bashing the case

Two common methods of drilling approaches are used in industrial applications, Down The Hole Hammer Drilling and Top Hammer Drilling methods, which perform similar functions but in different ways. To develop more efficient and cost-effective means of drilling to greater depths, here we talk about how to use the drilling methods to save cost-effectively. Difference Drilling Methods DTH Drilling / Down The Hole Hammer Drilling DTH Drilling is more accurate than TOP Hammer Drilling, DTH rigs use compressed air to drive the hammer behind the drill bit through dth drill rods, the piston directly hits dth button bit, and the hammer cylinder provides a straight and stable guide for the drill bit. This keeps the effects of energy from being lost in the joints,  DTH rigs drill straight holes with less deviation providing more accurate blasting and better fragmentation as a result, and allowing deeper percussion drilling, DTH drills are proven at depths of more than 20 meters. In addition, producing less noise than TOP Hammer drills. DTH drilling is more suitable for large holes in hard rock drilling, typically the maximum hole size for DTH drilling in a production environment is 254-330mm, especially for rocks with a hardness of more than 200Mpa. However, for rocks below 200 MPa, not only energy will be wasted, but also the drilling efficiency will be low, which will cause serious wear on the dth drill bit. This is because when the hole hammer’s piston strikes, the soft rock cannot fully absorb the impact, which severely reduces the efficiency of drilling and slagging.  (DTH drills mainly use pressurized air for slag flushing, and sometimes air foam for special applications.) Top Hammer Drills The impact force of the top hammer drilling generated by the piston of the pump in the hydraulic drilling rig

DTH hammer, also called down the hole ( DTH) hammer, is a kind of pneumatic rock drilling tool, DTH hammer is an integral part of the DTH Rig. The difference from others is that during DTH drilling process, down the hole hammer always stays at the bottom of the hole, impacting the rock by bit from DTH hammer directly. The rotating power acting on DTH hammer comes from rotation motor on the drill rig, the pull force comes from feeding device and transfers the energy to DTH hammer through drill pipe; High-pressure air enters into the DTH hammer through DTH drill rods, then run out from DTH hammer bits, exhaust air is used to blow up cuttings from the bottom of the hole; The rapid hammering process shreds hard rock into small fragments and dust, they are then blown away by a fluid, be it air, water, or the drilling mud itself. DTH Drilling technique was created to drill big holes vertically in ground boring drilling and other industrial applications, such as metallurgy, coal, chemical industry, water conservancy, hydropower, highway, railroad, national defense, construction, and other engineering hole-forming operations. You should keep the following points in mind while choosing the right DTH hammer for your projects: 1. DTH Hammer Size:The selection of DTH hammer size is largely determined by the hole diameter and type of rock formation, 3.5 to 10 inches is the best range of blast holes for DTH drilling. Smaller holes are typically drilled with a top hammer rather than a DTH hammer, and larger holes generally use the rotary drilling technique; DTH rigs drill straight holes with less deviation providing more accurate blasting and better fragmentation as a result. the size of the DTH hammer should be selected as close as possible to the size of

The purpose of a tricone drill bitTricone bits are widely used in the well-drilling industry,  the purpose of a tricone drill bit is to go into the ground and get to things like crude oil deposits, usable water, natural gas deposits, etc. Crude oil can be deep inside hard formations of rock, so a tough bit is needed to get down to it. When drilling for water, the drill bit makes fast work of the hard rock in the way and gets to the water below more efficiently than any other tool. Tricone bits will work for any type of rock formation whether it is hard, medium, or soft, but depending on the material being drilled through, they can drill through clay, shale, limestone, etc, and also go through hard shale, mudstone, calcites, etc. you’ll want to pay special attention to the type of tooth on the bit and seals to make sure you are staying safe during use. Four different types of tricone drill bits.1. Standard Roller Tricone BitStandard Roller is an open bearing used for shallow water as well as oil and gas wells. It is important to note that the open roller bits are less expensive to manufacture, and therefore less expensive to you. 2. Sealed Roller Tricone BitSealed Roller bit is protected a little better with a protective barrier around it making it great for digging wells. 3. Sealed Journal Tricone BitSealed Journal is used for drilling oil as it has the hardest face and can stand up to more. 4. Air Blast Bearings Air Blast Bearings are equipped with Air Circulation Bits and these tricone bits have air passages that supply air to the bearings for cooling and lubricating the bearing, and for cleaning the bearing from the drilling debris. How does a tricone

What Does Tricone Bit Mean? Tricone Bit is a type of drill bit that can be used for drilling soft, medium, and hard formations, using its rolling cutters to cut away the surface of the drilled rock. It has three rolling cutters, which must all rotate on lubricated bearings. The bearing surfaces are made of tungsten carbide, and the cones are usually steel-made. Tricone bits have two types body. One is Milled Teeth Body, which can be used in soft and medium formations; another is Tungsten Carbide Teeth Body (Inserted Teeth), which can bite into harder rock formations such as granite and limestone etc. Application: Widely used for Oil & Gas, Water well, Mining, Geothermal, Horizontal Directional Drilling (HDD), Blast holes, etc. What Does PDC Bit Mean? A PDC bit is a rock drill bit fitted with industrial diamond cutters. Polycrystalline diamond compact (PDC) fixed cutter bits with Polycrystalline diamond materials. Fixed-head PDC bits rotate as one piece without moving parts. PDC bits combine fine-grained artificial diamonds and tungsten carbide mixed under extremely high heat and pressure. After the metal is cooled, the tungsten carbide shrinked, kept the diamonds and tungsten carbide suspended in a matrix. When fixed-head bits use cutters, it means PDC bits. Application: Widely used for Oil & Gas, Water well, Mining, Geothermal, Horizontal Directional Drilling (HDD), Blast holes, etc. Structure Difference: Tricone Bit structures: PDC Bit structures: Tricone Bit Features: PDC Bit Features: Tricone Bit History: In 1908 Mr. Howard Hughes invented the two-cone drill bit. Then in 1933, Mr. Hughes furthered his two-cone invention by inventing the tri-cone drill bit. The two-cone and the tricone revolutionized the oil drilling business at that time. Starting from 1933, materials, technology, and efficiency have all been improved. The drill rigs have also improved along with various

Tricone bit is a type of rock drill bit that can be used for drilling soft, medium, and hard formations How is tricone bit work? It uses its rolling cutters ( also called three cones) to cut away the surface of the drilled rock. Tricone rock bit is usually fitted onto the end of a drill pipe and rotated against the drill face. What is tricone bit consist of? It has three rolling cutters ( also called three cones), which must all rotate on lubricated bearings which ensure smooth rotation under heavy loads. The bearing surfaces are made of tungsten carbide, and the cones are usually steel-made, cone-shaped heads equipped with several rows of concentric teeth. Tricone bits have two types body, one is Milled Teeth Body, which can be used in soft and medium formations, and another is tungsten carbide teeth, which can bite into harder rock formations such as granite and limestone, etc. What is tricone bits’ application: Widely used for Water well, Mining, Oil & Gas, Geothermal, Horizontal Directional Drilling (HDD), Blast holes, etc. Advantage: Tricone bits are also easier to control in extreme situations, providing more options regarding torque and Weight On Bits.

1. The use of high strength and toughness carbide teeth improves the impact resistance of teeth to reduce the broken tooth rate; 2. Optimized design of the number teeth, the number of teeth, tooth height, and unique alloy tooth profile, give full play to the bit-cutting ability and cutting speed; 3. Using a snap-lock locking cone can withstand high-pressure drilling;  Ball locking cone, to adapt to high speed. 4. Cone weld inlay reduction alloy, improve anti-bite bearing capacity; 5. The use of a highly saturated nitrile rubber O-ring, the optimized seal compression increases the bearing seal reliability;  Using a high-precision metal seal. Metal seal consists of a well-designed metal seal ring as the bearing axial dynamic seal, two high-elasticity rubber energizing rings are located in the tooth palm and cone sealing area as a static seal, the optimized seal compression to ensures that two A metal ring sealing surface always maintain good contact. 6. Adopting a full rubber oil storage bag that can limit the pressure difference and prevent the drilling fluid from entering the lubrication system, providing good lubrication for the bearing system and ensuring the normal working of the O ring seal, and improving the working life of the drill bit; 7. With 250 ℃ high temperature, and low wear and tear of the new grease to improve the drill seal lubrication system’s high-temperature capability. 8. Floating bearing structure, the floating element by the high strength, high elasticity, high-temperature resistance, high wear resistance characteristics of new materials, the surface of the solid lubricant treatment. Reducing the relative linear velocity of the bearing pair reduces the temperature rise of the friction surface, which can effectively improve the bearing life and bearing reliability under high-pressure or high-speed drilling conditions. 9. TCI inserts with high strength and toughness carbide teeth, the