​Analysis of the Pressure Adjustment Mechanism in Hydraulic Multifunctional Drilling Rigs

Analysis of the Pressure Adjustment Mechanism in Hydraulic Multifunctional Drilling Rigs

When using a fully hydraulic Multifunctional Drilling Rig, the pressure adjustment mechanism is always employed. So, what exactly is the pressure adjustment mechanism, and how does it play a crucial role in the operation of a fully hydraulic Multifunctional Drilling Rig?

As the name suggests, the pressure adjustment mechanism is a device that regulates pressure values to assist the drilling rig in achieving high-speed operation. It plays a vital role in the entire drilling process. Let’s analyze its function using a theoretical formula. The reasonable axial thrust for low-air-pressure down-the-hole (DTH) drills can be calculated using the following empirical formula:

When calculating the adjusted thrust (pressure) force during drilling with a DTH drill, the self-weight of the drilling components (including the drilling tools and the rotation air supply mechanism) exerts a force on the bottom of the hole (positive when drilling downward, negative when drilling upward). This force affects the magnitude of the reasonable axial thrust. Additionally, during drilling, there is frictional resistance between the drill pipe and the hole wall.

Therefore, a DTH drill must be equipped with a pressure adjustment mechanism to regulate the force (thrust) applied to the drilling tools. When the calculated value P is negative, it indicates that the axial thrust exerted by the self-weight of the drilling components on the bottom of the hole exceeds the required thrust P. In this case, the pressure adjustment mechanism must be used to reduce the pressure for. Conversely, when P is positive, additional pressure needs to be applied for. When P is zero, it means that the self-weight of the drilling components alone is sufficient for reasonable drilling, and no pressure adjustment is needed.  

The rotational speed of the drilling tools is also critical. hydraulic Multifunctional Drilling Rig Each impact of the drill bit can only break a certain range of rock. If the rotational speed is too high, some rock protrusions may remain unbroken between impacts, increasing the rotational resistance torque, exacerbating tool vibration, and accelerating bit wear. This not only reduces drilling efficiency but may also lead to bit jamming accidents. On the other hand, if the rotational speed is too low, repeated crushing may occur, failing to fully utilize the impact energy of the drill bit and resulting in reduced drilling speed.