En
Small-bore rock drilling equipment constitutes a specialized category of percussive tools primarily designed for compatibility with portable, pneumatic rock drilling systems including hand-held rock drills, air-leg rigs, and rail-mounted pneumatic units. These precision-engineered components are predominantly employed in shallow-bore drilling operations and small-diameter blasthole preparation across mining, quarrying, and dimensional stone extraction applications.
The core instrumentation within this classification comprises four principal subsystems:
1) Tapered drilling assemblies utilizing wedge-type thread connections
2) Monolithic drill rod systems with integrated flushing channels
3) Plug hole rod configurations for controlled charge placement
4) Shank adapter rods engineered for optimal energy transmission
This equipment category demonstrates particular efficacy in confined-space operations requiring high-frequency percussive action combined with rotational torque, typically operating within diameter parameters of 24-45mm and depth ranges up to 6 meters. The system architecture emphasizes modularity, wear resistance, and rapid tool interchangeability to maintain drilling efficiency in abrasive geological formations.
Technical enhancements include:
– Hardened alloy steel construction with surface treatments
– Standardized ISO 7238 thread profiles
– Optimized flushing port geometries
– Vibration-damped coupling interfaces
The operational envelope encompasses both vertical and inclined drilling orientations across Mohs scale 3-8 mineral matrices, with optional carbide button bit configurations available for extreme hardness applications.
The tapered button bit is primarily designed for use with pneumatic rock drills and tapered drill rods, operating through the tapered connection between the bit and drill rod. These bits are particularly effective for hard rock drilling applications and find extensive use in mine secondary blasting, rock bolting, tunnel drifting, and related operations. As an improved successor to chisel and cross drill bits, tapered button bits feature tungsten carbide button tips and hot-plated skirts that enhance drilling efficiency and significantly prolong service life. Standard taper angles for these drill bits are 7°, 11°, and 12°.
Tapered drill rods are designed for shallow-hole drilling operations using small pneumatic or hydraulic rock drills. These rods are typically manufactured from H22 and H25 hexagonal hollow drill steel. They must be paired with tapered drill bits for effective rock drilling and are commonly employed in quarrying, coal mining, roadbed construction, and similar industrial applications. Standard taper angles for these rods include 7°, 11°, and 12°.
Integral Drill Rods is a rock drilling tool that combines the drill bit, rod body, and shank adapter into a unified structure. Primarily employed in underground mining operations and small-diameter borehole drilling applications, this equipment is typically used in conjunction with low-power rock drilling devices (e.g., air-leg or handheld rock drills). The integrated design configuration significantly reduces energy loss during impact transmission, thereby enhancing both drilling speed and overall operational efficiency in rock excavation processes.
Shank Rods
The hexagonal shank drill rod (also referred to as a shank-end drill rod) is a light-duty rock drilling implement primarily employed in rail-mounted pneumatic rock drilling systems. This tool is specifically designed for precision drilling applications, including but not limited to: underground mine roof bolting operations, shallow-hole blasting preparations in mining operations, and shaft development drilling in confined geological environments. Its geometric configuration ensures optimal torque transmission and alignment stability during percussive drilling processes.
