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Horizontal directional drilling machine structure 03-Power head structure

The power head structure in horizontal directional drilling is primarily propelled by a high-speed motor. This motor, in turn, propels the power head through a speed reducer. The drill shaft is subsequently driven by the output shaft of a reduction box, which interestingly, is hollow. The power head serves several essential functions: first, it imparts rotational movement to the drill bit; second, it endures the reactive forces arising during drilling and towing; and lastly, it facilitates the passage of mud through the drill rod’s channel.

Currently, the design of domestic horizontal directional drill power heads shares a fundamental framework. Nonetheless, variations exist, primarily concerning the selection of the reducer. Remarkably, even within the same tonnage category, the choice of reducer is not uniform across horizontal directional drills. Consequently, the reduction ratios and performance metrics among different manufacturers diverge.

Alterations in the reduction gear ratio engender changes in the power head’s reduction ratio. Among prevailing transmission methods for the power head, chain and gear transmissions dominate. Chain transmissions boast uncomplicated structures and straightforward manufacturing processes. Yet, they are plagued by subpar transmission balance, limited longevity, and diminished output torque. Conversely, gear transmissions offer balanced transmission, prolonged operational life, and substantial output torque. However, their manufacturing demands precision.

Furthermore, the power head’s push-pull mechanism functions as an actuator, managing the advancement or withdrawal of the power head. Generally, a set of low-speed, high-torque motors propel a pair of reducers. These reducers, in turn, actuate a sprocket chain mechanism. This sprocket chain system furnishes the force required to either propel the power head forward or retract it.

In conclusion, the power head’s architecture in horizontal directional drilling hinges on a high-speed motor, which propels it via a speed reducer, subsequently driving the drill shaft through a reduction box’s output shaft. The power head’s roles encompass rotating the drill bit, withstanding reactive forces, and enabling mud passage. Though domestic power head designs share a foundational layout, disparities arise from reducer selections, leading to differing reduction ratios and performance metrics. The choice between chain and gear transmissions is marked by trade-offs in simplicity, balance, longevity, and torque output. Additionally, the power head’s push-pull mechanism relies on low-speed, high-torque motors and a sprocket chain setup for controlled advancement or retraction.


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