本实用新型设计的气动冲击机构，适用于气镐、气铲、气动捣固机等作业工具，也适用于气动凿岩机、潜孔钻等工程机械。这种冲击机构采用中心供气，改变了从缸壁供气的方式，使缸体加工省时省料。这种冲击机构的中心气管是固定的，它在冲锤尾部构成密封运动副，其优点在于结构简单、可靠性高。这种冲击机构还具有防止冲锤冲程打击缸体和回程打击阀座的措施，避免了由此可能引起的损坏，减小了机体振动。 The pneumatic impact mechanism designed by the utility model is suitable for pneumatic tools, gas shovels, pneumatic tamping machines and other working tools, and also applicable to pneumatic rock drills, submersible drilling machines and other construction machinery. This kind of impact mechanism adopts the central air supply, which changes the way of supplying air from the cylinder wall and saves time and material for the cylinder processing. The central air pipe of the impact mechanism is fixed. It forms a sealing movement pair at the tail of the hammer. Its advantage lies in its simple structure and high reliability. The impact mechanism also has measures to prevent the ram stroke from striking the cylinder block and the return stroke valve seat, thereby avoiding possible damage and reducing vibration of the body.