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Selection And Application Of Shank Adapter

2026-01-26

The drill rod of the rock drilling tool is the part that withstands the impact and torque exerted by the rock drill. It should have high toughness and no plastic deformation. The shank adapter can be part of the drill, or it can be made into an independent tail rod. [1] The shank adapter is mainly used in mining operations. It uses high-quality alloy steel as the raw material and undergoes overall carburizing treatment.

Commonly used shank adapter include shoulder (flange) type, lug (lug) type and spline type, as shown in the figure.

latest company news about Selection And Application Of Shank Adapter 0

The cross-section of the shoulder-type shank adapter is hexagonal, with an inscribed circle diameter of 22mm and 25mm, and a length of 108mm and 159mm. It is manufactured using a forging process and is used in light rock drills.

The drill lug type shank adapter is used for internal rotation medium-sized guide rail rock drills. The drill rod diameters are available in 25mm and 32mm.

Spline-type shank adapters are often used in heavy-duty guide rail-type external rotary rock drills with large torque, and the drill rod diameter is more than 38mm. Commonly used mechanical processing methods.

Application requirements

The shank adapter has a great influence on the rock drilling speed, rock drill and drill bit life. Therefore, the shank adapter should be of appropriate length, the end face should be flat and smooth, the cross section should be perpendicular to the axis, and should match the drill sleeve of the rock drill (the gap should not be greater than 0.5mm). The hardness of the shank adapter should be appropriate. If the shank adapter is too soft, the service life will be short. If it is too hard, the piston will be easily injured. Generally, the hardness of the shank adapter should be slightly lower than the piston hardness. The quenching hardness HRC=38~45 is appropriate.

Special CNC machine tool processing equipment and processing processes should be used to ensure the processing quality of tail details, internal water holes and side water holes. The shank adapter has been uniformly heat treated and scientifically straightened using precision instruments to ensure that the shank adapter is straight and anti-friction.

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