Air-cooled quenching device and quenching method for rock drilling rod

Abstract

The invention discloses an air cooling quenching device and method for a rock drilling drill rod. The device comprises a heating device, a temperature measuring device, a pit and a frequency conversion speed adjusting centrifugal fan arranged on the ground. An air cooling tower base is arranged at the bottom of the pit. An air cooling tower is arranged on the air cooling tower base. Air inlet holes are formed in the top of the air cooling tower, and the top of the air cooling tower extends out of the ground. The air cooling tower is connected with the frequency conversion speed adjusting centrifugal fan through an air guiding barrel. A main shaft box of the frequency conversion speed adjusting centrifugal fan is arranged on a machine base. The frequency conversion speed adjusting centrifugal fan is provided with an exhaust pipe. The rock drilling drill rod obtains a metallurgical structure with good surface abrasion resistance and the ideal core tenacity, conversion of a rock drilling drill rod quenching medium from traditional oil quenching and salt bath quenching to air cooling quenching is achieved, the hardness and the metallurgical structure of the overall rock drilling drill rod are uniform and stable, the comprehensive mechanical performance is good, the service life of the rock drilling drill rod is obviously prolonged, and obvious economic and practical value is achieved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment and quenching of rock drilling rods, and in particular relates to an air-cooled quenching device and a quenching method for rock drilling rods. Background technique [0002] Rock drilling rod is an indispensable tool in rock drilling and blasting. During the drilling process, the rock drilling rod bears the cyclic stress of tension, compression, bending and torsion imposed by high-frequency, high-impact rock drills, and at the same time bears huge Shock loads and wear. In addition, the rock drilling rod is also subjected to the abrasive action of working media such as rocks, rock powder and mineral water under high-speed rotary environmental conditions. Therefore, the service conditions of the rock drilling rod are very harsh, and the quality of the quenching of the rock drilling rod plays a very critical role in the service life of the rock drilling rod. [0003] The quality and performa...

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Problems solved by technology

The harsh working environment puts forward higher requirements on the quality of the drill rod, which not only requires the surface of the drill rod to have high hardness and wear resistance, but also requires the core of the drill rod to have high toughness, which is difficult to achieve by using other media. ideal metallographic structure

[0004] At present, the maximum length of rock drilling drill rods at home and abroad is 7-8 meters. For the quenching of longer drill rods, oil quenching, isothermal salt bath quenching, etc., cannot guarantee the uniformity of hardness and metallographic structure of the drill rods. The use conditions of the drill rod, the rock drill rod is prone to premature failure and unstable quality during use

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