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[CN201720354901.X] An air hammer title: An air hammer application number: CN201720354901.X Applicant: Chengdu Zhongsicheng Technology Co., Ltd. Application Date: 2017-4-6 Patent Type: Utility Model The utility model relates to the field of drilling machinery and discloses an air hammer, including an upper joint, a lower joint, an outer cylinder, an inner cylinder, a drill bit, an air seat and a piston, the upper part of the outer cylinder is connected to the upper joint, the lower part of the outer cylinder is connected to the lower joint, the inner cylinder is installed on the upper part of the outer cylinder cavity, the inner cylinder is sequentially installed with a gas seat and a piston from top to bottom, the upper part of the central air passage of the gas seat is installed with a spring, the central air passage of the gas seat is equipped with a gas hole, the gas hole is located below the spring, the piston, the guide sleeve, the inner cylinder and the valve seat are metal parts, and the parts are matched and sealed by metal sealing. The utility model has the technical effects of good air chamber sealing effect, long spring life and long air hammer life.
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