Abstract
At present, a lack of efficiency of the rotary drilling intensification can be observed at mining enterprises that employ drill rigs. Due to this, we propose to enhance the rotary drilling using shock loads by installing a down-the-hole (DTH) hammer into the drill string of the rig for roller drilling, for instance, SBSh-250. The paper discusses the issue related to an increase in the drilling rate using a drill rig with DTH hammer and adjustable valve that regulates the air flow. The paper considers different types of drilling in engineering and geological surveys. Rocks were sampled for various types of drilling. The physical and mechanical properties of rocks, which affect the drilling process, were considered. The study focuses on a significant increase in the drilling rate through an increase in the impact power. As part of the study, an improved drill rig with a down-the-hole hammer controlled by a radio receiver was developed. When analyzing the physical and mechanical properties, it was shown that the control of DTH hammer operation enables fast drilling of complex rocks without reducing the drilling rate. An increase in the drilling rate of self-propelled equipment using DTH hammers installed above the drill bit will reduce the cost of drilling and extend the service life of the working tool.
Highlights
At present, drilling-and-blasting (DB) is often used for hard rock development by the open method in both overburden and mining operations
The drilling rate is observed to decrease during drilling of complex rocks with alternating hard and soft layers, for example, rocks in the open pit of JSC Apatit. [8]
The main developments that focus on improvement of SBSh 250 are aimed at increasing the drilling rate by the automated control of operating parameters or by various technical means used for drilling intensification [3]
Summary
At present, drilling-and-blasting (DB) is often used for hard rock development by the open method in both overburden and mining operations. The most timeconsuming operation in DB is drilling blast holes. The drilling rate is observed to decrease during drilling of complex rocks with alternating hard and soft layers, for example, rocks in the open pit of JSC Apatit. The main developments that focus on improvement of SBSh 250 are aimed at increasing the drilling rate by the automated control of operating parameters or by various technical means used for drilling intensification [3]. M48 with the shock impulse (impact force) divided into sub-impulses using a valve, which consists of two plates with holes installed one above the other and connected by a single rim
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