IMMERSIBLE PERCUSSIVE MACHINE FOR DRILLING BORE-HOLES IN ANNULAR CUTTING FACE Russian patent published in 1998 - IPC

FIELD: mining industry; drilling machinery and equipment. SUBSTANCE: this machine can be used in geological prospecting, hydrogeology, mining industry. Increased impact capacity with ensuring possibility of operation with various energy-carriers ranging from dry air to gas-liquid mixture in the form of foam or aerated liquid, possibility of performing reversal of cleaning agent flow with direct back washing are achieved due to fact that immersible percussive machine has body with bore in its upper part, and sleeve located in its lower part. Also provided are sludge carrying pipe and distribution rod which are installed coaxially to create energy delivering passage between each other. Besides, there are following components: drilling tool, striker with axial passage and bore in its upper part, controlled chambers of working stroke and idle stroke, and energy-carrier distribution system having supply and exhaust ducts. Machine is provided with self-contained (for working stroke chamber) feeding-discharging device containing stepped-type valve installed on distribution rod, discharge duct made in the form of radial holes in rod and in sludge-carrying pipe in valve location zone, command duct made in the form of radial holes in upper part of striker which periodically connect working stroke chamber with supply duct through bores in striker and body. In addition, installed in discharge duct between distribution rod and sludge-carrying pipe is non-return valve made in the form of flanged collar. EFFECT: higher efficiency. 1 cl, 2 dwg