The core function of the rotary drilling rig pick with alloy pellets is to enhance the performance of key cutting parts through the cemented carbide particles (alloy pellets) inlaid on the pick head, so as to adapt to complex and harsh drilling conditions. It can be specifically divided into the following 4 points:

1. Greatly improve wear resistance and extend service life
   Alloy pellets are mostly made of high-hardness tungsten-cobalt alloy (with a hardness of up to HRA 89-92) or super-hard composite materials, and are inlaid on the cutting surface of the pick through a special process to form a multi-point wear-resistant protective layer. Compared with ordinary integral alloy head picks, their wear resistance is improved by 30%-50%, making them especially suitable for highly abrasive formations (such as dense sandstone, red sandstone, pebble layers containing quartz particles, etc.). For example, in the hard rock working conditions of a coal mine in Shanxi, the replacement cycle of alloy pellet picks can be extended from 17 hours of ordinary picks to more than 50 hours, and the cumulative drilling mileage of a single set of picks is increased by more than 25%.
   

2. Enhance impact and fracture resistance to adapt to complex formations
   The dispersed inlay structure of alloy pellets can disperse the impact load during drilling (able to withstand an impact of more than 50-150kN), avoiding the chipping and shank breakage of picks caused by local stress concentration. In complex formations with alternating soft and hard layers such as coal seams with gangue and fracture zones, it can effectively cope with frequent "hard contact" impacts, solve the pain point of ordinary picks that "they are prone to chipping in hard rock and wear in soft rock", and improve operation stability.
   

3. Optimize cutting efficiency and reduce construction energy consumption
   The protruding particles of alloy pellets can form a "point cutting" effect, reduce the contact area between the pick and the rock formation, lower cutting resistance, and make rock penetration smoother and easier. At the same time, the high-hardness performance of alloy pellets can prevent pick head deformation during cutting, maintain a stable cutting angle (keeping the optimized range of 15°-30° rake angle and 5°-12° clearance angle), and reduce invalid energy consumption caused by cutting attitude deviation. Especially in hard rock drilling, the efficiency can be increased by more than 20%.
   

4. Reduce comprehensive construction costs
   On the one hand, the extended service life of alloy pellet picks reduces the frequency of pick replacement and lowers the cost of consumables procurement (statistics show that in medium-hard rock working conditions, the pick consumption cost per ton of coal / cubic pile can be reduced by more than 38%). On the other hand, it cuts down the downtime for pick replacement, increases the effective operation time of equipment, and reduces the risk of cutter head failure caused by pick damage, thereby indirectly decreasing maintenance costs.
   

Supplementary Notes on Application Scenarios

This type of pick is particularly suitable for medium-hard rock and hard rock formations with a compressive strength of over 80MPa, as well as complex formations containing abrasive particles (such as cemented slate and pebble layers). It is commonly used in projects with high requirements for pick wear resistance and impact resistance, such as highway pile foundations, tunnel excavation, and mining.