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2022
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Type of high-pressure down-the-hole drill bit and quality requirements for lubricating oil of drill bit
There are four main types of end face designs used in high-pressure down-the-hole drills: convex end face, flat end face, concave end face and deep concave central end face. Cemented carbide is mostly used in the common tooth distribution mode of ball teeth, spring teeth or ball teeth and spring teeth. 1, the end face convex type: the drill bit is divided into single boss and double boss end face two forms, the latter is mainly used for larger diameter down-the-hole drill. The convex down-the-hole drill can maintain a high drilling speed when drilling into hard and hard abrasive rocks, but the straightness of the drilling is poor, so it is not suitable for rock drilling projects with high straightness requirements.
high pressureDTH BITThere are four main types of end face design: convex end face, flat end face, concave end face and deep concave central end face. Cemented carbide is mostly used in the common tooth distribution mode of ball teeth, spring teeth or ball teeth and spring teeth.
1, the end face convex type: the drill bit is divided into single boss and double boss end face two forms, the latter is mainly used for larger diameter down-the-hole drill. The convex down-the-hole drill can maintain a high drilling speed when drilling into hard and hard abrasive rocks, but the straightness of the drilling is poor, so it is not suitable for rock drilling projects with high straightness requirements.
2. Flat endface type: The drill bit of this shape is relatively strong and durable, and is suitable for drilling hard and extremely hard rocks, as well as medium and soft rocks that do not require high straightness of the blast hole.
3. Face concave type: The end face of the drill bit of this shape has a conical recess, which is a slight nucleation effect of the drill bit during the rock drilling process to maintain the centering performance of the drill bit, and the drilled blasting hole has a good straight line. This kind of drill has good powder discharge effect and fast drilling speed. It is the most used DTH drill in the market.
4. Deep concave center type: This shape of the drill bit is evolved from the same type of button drill bit. The central portion of the end face of the bit has a deeply concave central portion. It is used for nucleation during rock drilling to ensure the straightness of the blast hole when drilling deep holes. It is only suitable for drilling soft and medium hard rocks.
DTH IMPACT LUBRICATION
DueDTH BITThe working conditions are poor, the dust content is large, the humidity is large, the piston reciprocating frequency is high, and the impact speed is large, so the lubrication of the impactor is very important. important.
(I) the purpose of lubricating the impactor of the gas elevator The purpose of lubricating the impactor is roughly three:
1) Reduce the friction loss of moving parts. More serious is the excessive friction caused by insufficient lubrication, so that the contact surface to produce small summer clothes, such as crack growth, resulting in damage to parts. In addition, surface overheating caused by excessive friction will cause local softening and plastic deformation of the metal, which will eventually lead to the destruction of the cylinder and piston;
2) Anti-corrosion effect. Shock hot parts are easily corroded by chemicals in compressed air and water in drilling, and the corrosion effect and the stress in the parts exist at the same time. It will seriously reduce the strength of the parts; corrosion will further expand the cracks or damage the parts directly from the rusty area of the corrosion pit, so preventing corrosion is one of the important functions of lubrication;
3) Sealing function: Proper lubrication can ensure the sealing between the moving parts of the impactor and prevent the efficiency of the impactor from being reduced due to poor sealing.
Quality Requirements for (II) Lubricating Oil
1) Must have high liquid film strength;
2) It is not easy to spray or interfere with the movement of the valve plate;
3) Smoke and toxic gases shall not be discharged;
4) No corrosion under any conditions;
5) All parts that need lubrication can be lubricated quickly;
6) Full lubrication under high ROP, high temperature and low temperature;
7) Cold air or hot air does not form sticky residue;
8) high oil quality.
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