SHENLI
Efficient energy transfer maintains straight drilling trajectories
Open expansion chambers in mines require controlled long-hole drilling. The S250 delivers stable power that maintains straightness, preventing deviations that could impact blast performance.
Its low recoil reduces fatigue and allows drilling teams to maintain high output throughout the shift.
As a factory specializing in rock drilling machinery, we introduce the S250, a robust drill designed for controlled long-hole drilling in open expansion chambers. Engineered for precision, the S250 delivers exceptionally stable power transmission to maintain perfectly straight drilling trajectories, directly addressing the critical need for accuracy in chamber blasting where any deviation can compromise blast effectiveness and safety. Its advanced damping system significantly reduces operator fatigue by minimizing recoil, enabling drilling crews to sustain high productivity levels throughout entire shifts without loss of precision or power. This focus on efficient energy transfer sets a new standard for reliable performance in challenging mining environments.
The operational protocol for the S250 emphasizes simplicity and durability. Operators connect the drill to a standard mine air supply, initiate the integrated dust suppression system, and engage the feed force control to begin drilling. The machine’s self-aligning rod system guides the drill steel, requiring minimal manual correction. Regular maintenance involves basic lubrication of the drifter and visual inspection of the feed mechanism, ensuring longevity and reducing downtime. This user-centric design philosophy ensures that the S250 performs reliably under continuous operation.
A compelling demonstration of progress can be seen by comparing the S250 with the previously ubiquitous YT29A leg-mounted rock drill. While the YT29A served as a versatile and reliable workhorse for general rock drilling, its application in long-hole drilling for precise expansion chambers presented limitations. The manual positioning and inherent vibration of the YT29A often led to gradual hole deviation over longer distances, requiring corrective measures and potentially affecting blast fragmentation.
FACTORY
Operator fatigue from handling the tool was also more pronounced during extended operations. In contrast, the S250, with its rail-mounted feed and stabilized drifter, eliminates these issues.
Mines that have transitioned report a dramatic improvement in borehole straightness, leading to more predictable and efficient blasting patterns, a significant reduction in re-drilling work, and a marked increase in both operator comfort and overall advance rates. The move from the YT29A to the S250 represents an evolution from basic rock breaking to targeted, precision engineering for specialized tasks.
Building on this legacy of innovation, our factory developed the S250 to meet the exacting demands of modern mining techniques. The core of its performance lies in a perfectly balanced pneumatic drifter mechanism. Unlike conventional designs where energy is partially wasted as lateral vibration, the S250’s internal valving and piston configuration channel impact force directly along the axis of the drill steel. This focused energy transfer is what guarantees the straight-line penetration crucial for expansion chambers.
The drill’s rigid guide rail, constructed from a single piece of hardened steel, provides an unwavering path for the drifter carriage, resisting the natural forces that cause wander. Furthermore, the ergonomic control panel centralizes all functions—feed pressure, rotation speed, and water flow—allowing for fine-tuned adjustments based on rock hardness.
This results in optimal penetration rates regardless of whether the formation is soft shale or abrasive granite. For mining engineers, the S250 translates into predictable drill patterns and consistent hole depths, which are fundamental for calculating precise explosive loads. The resulting uniform fragmentation not only improves downstream loading and hauling efficiency but also enhances safety by reducing the risk of unstable rock walls and flyrock. By transforming the critical first step of drilling into a controlled, repeatable process, the S250 establishes a new foundation for productivity and precision in underground development.
Post time: Dec-23-2025
