The classification of core drill bits

Rotary core drill biting rig construction of the strata vary, technical requirements and different, just by selecting different core drill bits to meet various construction requirements, so do the matching rotary core drill biting rig core drill bit work is very important. Impact rotary core drill biting rig core drill bit matching many factors, summed up in three aspects: stratigraphy; rig functions; hole depth, the specific requirements of the aperture, Shen ballast thickness Wall measures. First, the current classification of common auger core drill bit bit common spiral auger core drill bit, rotary bucket, drum core core drill bit, core drill bit belled, GRABBING cone core drill bit and hydraulic grabs, following a brief introduction by the class. 1, the auger (1) cone: Double double spiral for hard rock. Double single screw for weathered bedrock, gravel, soil, etc. containing ice. Equipped with a variety of the above core drill bit cutter through tooth pitch, helix angle of the change can be derived from the many types of core drill bits. (2) straight auger: bucket teeth straight Lo: Double double spiral, suitable for sand, cement poor small-diameter gravel; single-headed screw, suitable for sand, soil; single head single screw for poor cementation large diameter gravel, clay soil and hard clay. Straight screw cutter: a double spiral, three and four-Lo Lo, then apply hard rock or gravel. 2, auger core drilling bit bucket teeth can be divided by the installed cutter core drill bit bucket and bucket teeth core drill bit bucket; the floor can be divided according to the number of double bottom bucket and single bottom bucket; can be divided according to the number of open double doors and single bucket open bucket; can be divided according to taper cone barrels barrels barrels of core drill biting straight core drill bit bucket and bucket; can be divided according to the lower plate shaped pot bottom of the core drill bit core drill bit bucket peaceful struggle. Above structure combined with each other, plus whether vented, change door mechanism can be combined dozens of auger core drill bit bucket. Generally applicable double bottom formation core drills bits bucket wide range, single bottom applies only to tack a strong soil, two-door core drill bit formations suitable for a wide range of fighting, fighting only for single door core drill bit large diameter and pebbles hard clay.

The function of core drill bit

The rotary core drill bitsing rig features to choose if the auger core drill bits bit has to do a continuous function, can be equipped with hydraulic grab or continuous milling wheel construction. If the secondary rope winch with automatic release function, optional percussion core drill bits bit and core drill bits large diameter core drill bits  GRABBING pebbles or boulders. If equipped with gas chambers and faucets can be gas-liquid core drill bits. If equipped with dual power head or rub into the casing pipe core drill bit machine can be, which is to solve the flow of sand, crushed gravel, silt layer effective construction method.according to the choice of a number of other factors core drill bits if Shen ballast thickness requirements more stringent or belled during core drill bitsing, the need to fight with dedicated clean ballast. When core drill bits into the sleeves, a small gap between the core drill bits and the casing, in order to prevent and reduce the core drilling bits casing hanging touch suction effect, matching the core drill bits should have vent, with the core drill bits bit with a guide, opening and closing device as close to the center of the core drill bits, one of the best machine hand. You can also solve this problem through the use of special combination core drill bits.

Selection of core drill according to the geological conditions

   Rotary core drill biting rig main function is to form a hole in the ground tank, work object is a rock pile hole depth due to the construction of shallow rock through tectonic movement, the role of mechanical and chemical nature, structure, grain size, porosity, bond conditions , occurrence, strength and other complex changes occur, coupled with our vast pieces of the original, so the object of rotary Arix core drill bit rig work is particularly complex. Summed up in the following categories. By lithology points (common) for shale, sandstone, limestone, granite; divided by cause magmatic rocks, sedimentary, metamorphic; divided by the mechanical properties of sturdy plastic and loose. So how to choose based on stratigraphy core drill bit it? The following classification of introduction. (1) Clay: use single bottom of auger core drill bit bucket, if the diameter is too small can or bucket with two removable panels earth core drill bit bucket. (2) slurries, viscous not strong soil, sand, cement poor gravel layer smaller particle size, can be equipped with a double bottom core drill biting core drill bit bucket. (3) hard clay: use a single port into the soil (single double bottom can) auger core drill bit bucket, bucket teeth straight or spiral. (4) the permafrost: a small amount of available ice bucket teeth straight auger hopper and auger core drill bit bucket, available in large cone ice auger, a description that auger for soil (except silt outside) are valid, but there must be no use of groundwater in the case, in order to avoid the suction effect caused stuck. (5) cemented gravel and strongly weathered rock: be equipped with a conical double bottom auger and auger Diamond Core Drill Machine bucket (large diameter single-port, dual-port with a small particle size) (6) stroke group rock: drum cutter with coring core drill bit - tapered auger - spin double bottom bucket digging core drill bit or auger cutter straight - rotary core drill bit bucket digging double bottom. (7) weathered bedrock: with a cone core drill bit coring barrel - conical auger - Rotary core drill bit bucket digging double bottom should be taken if the diameter is too large grade core drill biting process.

Drum core drill bit

At present, there are two common: tube cutter drill (for medium hard rock and gravel), core drill bit tube (for hard rock and large boulders). In barrel coring drill bit in two categories, and with and without coring device to take points of core devices, depending on the difficulty of coring. Because cone core drill is mainly used for hard rock drilling and drill the ring area, if the conditions can also pass on part in the installation of reverse circulation core drills bits drill to improve drilling efficiency. 1,4 expanding bottom pile diameter drill in deep pile does not increase without increasing basis, in order to improve the bearing capacity of single pile, the design department is often achieved through the pedestal pile, rotary drilling rig construction is expanding bottom without any changes can be construction, you can simply choose belled core drilling bits. Belled drill used to mechanically based, such drills are relatively simple to use and maintain, there is the open and under the open, the opening of the four-link mechanism is generally used for soil, strong winds, weathered even hard rock formations. Due to non-circulation drilling Rotary Drilling, completion of expansion after the end of the barrel with slag slag can be.

The classification of core drilling bits

Current common classification auger core drilling bits common helical auger core drilling bits, rotary bucket, drum core drilling bits, belled core drilling bits, impact core drilling bits, red cone core drilling bits and hydraulic grab grab, following a brief introduction by the class. 1,1 auger (1) cone: Double double spiral, suitable for hard rock. Double single screw for weathered bedrock, gravel, soil, etc. containing ice. Equipped with a variety of the above core drilling bits cutter through tooth pitch, helix angle of the change can be derived from the many types of core drilling bitss. (2) straight auger: a, bucket teeth straight Lo: Double double spiral, suitable for sand, cement poor small-diameter gravel; single-headed screw, suitable for sand, soil; single head single screw, suitable for large diameter difference cemented gravel, clay soil and hard clay. b, picks straight spiral: a double spiral, three and four-Lo Lo, then apply hard rock or gravel. 1,2 auger core drilling bits bucket teeth can be divided by the installed cutter core drilling bits bucket and bucket teeth core drilling bits bucket; the floor can be divided according to the number of double bottom bucket and single bottom bucket; can be divided according to the number of open double doors and fighting single door bucket; can be divided according to taper cone barrel barrel barrel core drill bit bucket and core drilling bits straight fight; shape can be divided according to the lower plate and flat-bottom pot core drilling bits bucket core drilling bits bucket. Above structure combined with each other, plus whether vented, change door mechanism can be combined dozens of auger core drilling bits bucket. Generally applicable double bottom formation core drilling bits bucket wide range, single bottom applies only to tack a strong soil, two-door core drilling bits formations suitable for a wide range of fighting, fighting only for single door core drills bit large diameter and pebbles hard clay.

Using method of core drill bit

Non-core drill bit in use process, because of the existence of these problems, at the same time by the workpiece material, quality requirements, different situations such as restrictions on  core drill bits site, the technical measures adopted accordingly in order to change. 1) due to the  diameter  core drill bits bit of low strength, poor rigidity, easy to break, so the beginning of  core drill bits, the feed force should be light, prevent the  core drill bits bending and sliding, so as to ensure the correct position before cutting  core drill bits. Note that the strength of the hand and feel feeding, when the bit bouncing, let it have a buffer range, in order to prevent the bit broken, sometimes as long as the feed force is very . The feed force is too , manual feed is not easy to feel it, then in the feed mechanism is provided with a  heavy Tuo, by weighing feed purpose. 2) in the core drill bit process, the need to pay attention to the frequent  core core drill bit withdrawing, promptly filed a bit. Because of the  diameter  core drill bits work, chip groove is narrow, chip is not smooth, so we should timely return  core drill bits chip, annealing times and hole  core drill bits depth is proportional to, can also take the opportunity to enter the cooling liquid or cooling in air. 3) use high precision  core drill bits machine,  core drill bitsing machine for  diameter  core drill bits requirements spindle sensitivity and high rotation accuracy,  vibration, good rigidity, the spindle runout should be less than 0.005mm,  spring clamping with special  core drill bits bits, and not the  core drill bits chuck or three jaw chuck clamp  core drill bits. Using circlip clamp can make accurate and reliable positioning, uniform stress and can offset a portion of deflection error, improve the rotation precision  diamond core drill bit, but should never use emery cloth, paper bold  hss core drill bit  handle clamping.

The development of core drill bit

Core drill bits or needs to be replaced at the end of the center core drill bits, you should clear the hole, the hole bottom residue Chuijin, then stop turning, the center of the arix core drill bit slowly move up move, the size of the lifting force to move the center of the core drill bits just to mention as appropriate, to enhance the height of the eccentric core drill bits back up contact with the front end of the casing shoe; then core drill bits a low speed reverse, while slowly lifting up the test center core drill bits. When the observed center core drill bits can smoothly upgrade, show eccentric core drill bit has collapsed, then the center core drill bits can enhance a conventional manner, until all proposed center core drill bits. When reversing core drill bits, care should be taken to prevent tripping core drill bit.

Sometimes due to excessive residual rock bottom slag hole, eccentric rotary core drill bits is part of rock slag death eccentric core drill bits folded card. When try to mention a few still does not work, should convey compressed air, re-core drill bits for cleaning, and DTH for a short work, and then re-center the core drill bits lifting operations.
DTH core drill bits pipe construction technology is an effective method for overcoming the complex formation core drill bits means difficult, eccentric core drill bits pipe with its unique structure, excellent performance for complex formation to provide core drill bits construction a reliable technical support. Applied to the construction of the electroplated core drill bit pipe with the specifications of the series has also been increasingly improved.

How to use core dirll bit

When the complex formations with pipe segmented dry core drill bit, core drill bits parameter selection should be based on a low-speed, low feed pressure, high wind speed on the return to the principle of operation of the construction process should hardness of rocks, loose formations depending on the extent of core drill bits , moisture and other factors control core drill bits speed, especially when core drill bits encountered large loose or fractured formations, in particular, to reduce the feed rate and feed pressure, repeated slag hole cleaning. In the specific construction operations should also pay attention to the following aspects:

⑴ should be checked before the next core drill bit hole DTH hammer, with the core drill bits pipe, casing and casing shoe is firmly connected to the eccentric core drill bits rotation is flexible, whether ventilation.

⑵ should be observed during core drill bits to follow up the case and the case sleeve pink hole row, every 0.3 to 0.4 meters core drill bits should be a strong blow hole ranked powder to keep the hole clean. When the blow hole, center core drill bits up Poppet distance should be strictly controlled in order to achieve a strong blow hole powder row limit, prohibit core drill bits process in a strong pull from the center of the Non-core drill bit.

How to maintain core drill bits

arix core drill bit is often used in modern construction industry to a class of hardware and tools, with the core drill bits bit, the home will be some small core drill bits installation is particularly simple, but the quality and stability of the core drill bits bit quality performance is determined to a certain extent its results, so in order to use the core drill bits during core drill bits by showing some more good results, then the use of the core drill bits process must pay attention to its maintenance, how to care for the core drill bits in the course? Xiao Bian Weapon look at it!
 1, when core drill bits steel, please ensure sufficient cooling capacity and the use of metal cutting fluid.

 2, a good core drill bits steel and rail gap can improve the accuracy of core drill bits and core drill bit life.

3, please ensure smooth and clean magnetic base and workpiece.
4, when the core drill bits sheet, to reinforce the workpiece when core drill bitsing large parts, please ensure stability of the workpiece.
5, at the beginning and end of the core drill bits, the feed rate should be reduced 1/3.
6, a large number of fine powder of the material occurs when diamond core drill bit, such as iron, copper, etc., can not use the coolant, and the use of compressed air to help chip removal.