According to the vibration-knocking tool and structure ,is  hydraulic and mechanical in terms of its structure.

Their common features are:

Can circulate the drilling fluid, the center must have the circulation drilling fluid the channel;

Can transmit the torque, the heart axis and the outer cylinder can not have the circumferential movement;

High-strength sealing, internal liquid can not be leaked, external liquid can not be infiltrated;

There is a storage mechanism, can be stretched or compression of the elastic can accumulate, and then suddenly release, resulting in high-speed movement;

A striking couple, i.e. an impact body and a bearing body, are composed of a pair of conflicting couples;

To have a connecting mechanism, because it is connected in the middle of the drill string to work, so the upper and lower parts must have the thread connected with the drill string.