The internal combustion rock drill is a new type of rock drilling machine powered by a low-power internal combustion engine (mostly a two-stroke gasoline engine), which is suitable for field operations without power supply and air compressor. According to work needs, in addition to rock drilling operations, internal combustion type rock drills are generally equipped with more than ten tools (such as grinding wheels, picks, spades, shovel, etc.) for crushing, shoveling, digging, splitting, tamping, etc. .
The impact working principle of the YN-30A internal combustion rock drill is shown in the figure below. The machine is suitable for drilling downward, horizontal and upward blast holes less than 45° on medium-hard rocks. The deepest downward drilling can reach 6m. The fuel is a mixture of gasoline and engine oil with a volume ratio of 2:1.
The COMBUSTION ROCK DRILL engine piston and the impact hammer are installed in the same cylinder, and a combustion chamber is formed between the piston and the impact hammer. After the engine is started, the crank drives the piston to reciprocate through the connecting rod. When the engine piston moves to the left at a high speed and the pressure in the crank on the right side of the piston drops to the lowest point, the gasoline enters the crankcase through the carburetor and the air, and then passes through the oil pipe. And the intake valve enters the combustion chamber; when the piston continues to move to the left, after closing the exhaust valve, the combustion chamber is filled with combustible gas and is compressed as the piston moves to the left. At this time, the impact hammer is in the compressor chamber Under the restriction of the pressure gas, it is still in the extreme right position, and the combustible gas in the combustion chamber is compressed and the pressure increases.
When the piston moves close to the bottom dead center, the spark plug starts to ignite, causing combustible gas to burn and explode. At this time, the pressure in the combustion chamber rises sharply, and the piston still moves to the left due to the flywheel torque until the bottom dead center II-II. During this period of time, the combustible gas will be completely burned and the highest pressure will be emitted; under the action of the high-pressure gas, the impact hammer will overcome the resistance in the compression chamber and accelerate forward. The air pressure in the air chamber will increase and the exhaust valve will be opened to discharge part of the gas to reduce the resistance to the movement of the piston, so that the impact hammer will hit the shank with the maximum impact force for rock drilling. After the impact, the crank connecting rod mechanism will drive the piston to make a return movement.
The space in the combustion chamber gradually increases. When the piston moves into the combustion chamber and the pressure is lower than the pressure in the compressor chamber, the impact hammer moves to the right and stops at the extreme right position (the air in the annular space on the right side of the impact hammer can pass through the intake valve And the exhaust valve can be adjusted freely); the air pressure in the compressor chamber can be adjusted by means of the intake valve and exhaust valve. When the piston continues to move to the right to open the exhaust valve, the exhaust gas in the cylinder is discharged from the body. Then the intake valve 4 is opened, the combustible gas in the crankcase is compressed and enters the combustion chamber from the intake valve, and exhaust gas is discharged at the same time. When the piston moves to the top dead center, it starts the next working cycle.
The rotation of the drill rod of the internal combustion rock drill can be achieved by means of an internal ratcheting rotating drill mechanism without an independent spiral rod or an external rotating drill rotating mechanism driven by the crank spindle.
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