The invention relates to a rock piercing
drill of a rotary digging
pile machine, in particular to a hole
bottom water injection variable-pick multifunctional rock-piercing
drill of the rotary digging
pile machine, mainly aiming at solving the problems that the strength of a
drill pick is decreased after the drill pick of the existing rock piercing drill of the rotary digging
pile machine is heated, the consumption of the drill pick is great, oil and
water supply pipelines are frequently twisted on a telescopic drill rod and accidents are caused consequently. The hole
bottom water injection variable-pick multifunctional rock-piercing drill of the rotary digging pile machine is characterized in that the lower end of a drill rod socket is fixedly arranged on a rotary water tank core body, the lower end of the rotary water tank core body is connected with a drill rod, a rotary water tank jacket is arranged on the outer circumference of the rotary water tank core body, a water inlet joint, a
water pipe and an air exhaust and water overflow valve are arranged on the outer wall of the rotary water tank jacket, an anti-rotating casing is arranged on the outer circumference of the rotary water tank jacket, a water
injector is arranged on the inner side of the lower end of the anti-rotating casing, a water injection
piston of the water
injector is connected onto the rotary water tank jacket, a center hole which is communicated with the rotary water tank core body is formed in the drill rod, one end of a high-pressure
water pipe is connected onto the water
injector, the other end of the high-pressure
water pipe is connected into the water injection hole in the rotary water tank jacket and a
check valve is arranged in the drill rod. The hole
bottom water injection variable-pick multifunctional rock-piercing drill of the rotary digging pile machine has the advantages that the temperature of the drill pick can be kept normal, the wear is reduced, the structure is safe and reliable and the installation and the maintenance are facilitated.