Type of shank adapter
Related products Link:
There are three commonly used shank (flange) types, shank (lug) type and spline type.
The cross section of the shank adapter is hexagonal, the diameter of the inscribed circle is 22mm and 25mm, and the length is 108mm and 159mm. The shank is manufactured by forging technology and is used in light duty rock drills.
The shank adapter is used for medium-duty rail-type rock drills with internal rotation. The drill pipe diameters are 25mm and 32mm, respectively.
Spline shanks are typically used for heavy-duty orbital external rotary rock drills with high torque, with drill pipe diameters greater than 38mm. Commonly used machining methods for shank tails.
The shank used in Chinese mines is mainly made of two kinds of steel, namely 35SiMnMoV or 24SiMnNi2CrMo, and the service life of the latter has been significantly improved.
The shank has a great influence on the rock drilling speed, the drill bit of the trolley, the rock drill and the life of the drilling rig. Therefore, the shank should have an appropriate length, the end face is smooth and clean, perpendicular to the axis, and consistent with the drill sleeve of the rock drill (the gap should not be greater than 0.5mm). The hardness of the handle should be appropriate. If it is too soft, the life of the handle will be short. If the shank is too hard, the piston can be easily injured. Generally, the hardness of the shank should be slightly lower than that of the piston, and the quenching hardness HRC = 38~45 is suitable.
The shank should use special CNC machines and machining procedures to ensure the quality of the tail details, internal water holes and side water holes. The shank is uniformly heat-treated and scientifically straightened with precision instruments to ensure the straightness and anti-irritancy of the shank.
Drilling tool manufacturers and threaded drill pipe manufacturers tell you that the shank drilling tool is a tool used for rock drilling. Derusting of the shank can be selected by a through shot blasting machine or a sucker rod shot blasting machine, which can derust and strengthen the shank and remove the oxide on the surface of the shank. The cleaning effect is very good.
When using a drill bit, shank adapter and drill pipe, first check whether the drill shank is flat, whether the shank adapter and taper hole meet the requirements, whether the blade of the drill bit is damaged, whether the water hole is unblocked, whether the shank adapter and whether the wind and water pressure are sufficient are strictly prohibited. Collision between the alloys of the drill bit.
