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The working principle of the impact valve mechanism:

(1) Piston stroke is the impact stroke, which means that the piston moves forward from the rear end of the cylinder The whole process from movement to hitting the shank. At the beginning of the stroke, the piston is on the left and the valve is on the extreme left. When the control valve is turned to the operating position of the machine, the compressed air from the control valve hole enters the left cavity of the cylinder through the cylinder head air chamber, the ratchet channel, the valve cabinet channel, the annular air chamber and the valve sleeve hole at the front end of the valve. The right cavity communicates with the atmosphere through the holding air port. At this time, the piston quickly moves to the right under the compressed air pressure until it hits the shank tail. When the right end face A of the piston crosses the air holding port, the remaining air in the right cavity of the cylinder is compressed by the piston, and its pressure gradually increases. After the return passage, the right chamber communicates with the left end air chamber of the valve, so the pressure in the air chamber gradually increases as the piston continues to move to the right, which tends to push the valve to move to the right. When the left end face B of the piston crosses the exhaust port, the left cavity of the cylinder is communicated with the atmosphere, and the air pressure drops suddenly. At this instant, under the action of the pressure difference between the two sides of the valve, the valve quickly moves to the right and closes with the front cover, cutting off the air path to the left cavity. At the same time, the piston moves to the right by inertia and impacts the shank. The impact ends and the return stroke begins.

(2) The return stroke of the piston is the return stroke. At the beginning, the piston and valve are in the extreme right position. At this time, the compressed air enters the right cavity of the cylinder body through the cylinder head air chamber, the ratchet hole, the valve cabinet hole, the gap between the valve cabinet and the valve, the air chamber and the return hole, and the left cavity of the cylinder body communicates with the atmosphere through the exhaust port, so the piston Start moving to the left. When the left end surface of the piston passes the exhaust port, tungsten carbide the remaining air in the left cavity of the cylinder is compressed by the piston, pressing the right end surface of the valve. As the piston moves to the left, the air cushion that gradually increases pressure also pushes the valve to move to the left. . When the right end of the piston passes over the air hole, the right cavity of the cylinder is in communication with the atmosphere, the air pressure drops suddenly, and the air pressure in the air chamber also drops. Under the action of the pressure difference between the two sides, the air distribution moon is pushed to the left to close with the valve cabinet, cutting off the air path to the right cavity of the cylinder and opening the air path to the left cavity of the cylinder. At this moment, the piston returns to the cylinder. End the return journey on the left end of Tungsten Carbide Burr Blank the body. The compressed air enters the left cavity of the cylinder again to start the next working cycle.

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