134results about How to "Avoid violent vibration" patented technology

A milling tool which includes a nose cutting portion, a cutting section having a plurality of hardened cutters and a shaft portion. A wear pad is disposed on the cutting section and shaft portion. Upon the shaft portion, the wear pad extends radially outwardly to an engagement diameter that exceeds the maximum cutting diameter of the cutters.

The invention discloses a high-precision short-radius rotary steering drilling tool. The high-precision short-radius rotary steering drilling tool comprises a steering drilling short section, drilling pressure torque deflection transmission mechanisms, a tool face angle measurement module, a control module, a jumper circuit and a driving drill column, wherein the steering drilling short section is connected to a conventional drill column or a rotary driving device above the steering drilling short section through the driving drill column. The steering drilling short section is composed of a drill bit and a steering short section, the steering short section comprises a bearing body, and the drill bit is fixed to the tail end of the bearing body. The driving drill column comprises a plurality of bearing short sections which are sequentially connected from top to bottom, the bearing short section located at the bottommost portion is connected with the bearing body, every two adjacent bearing short sections are hinged through the corresponding drilling pressure torque deflection transmission mechanism, and the bearing short sections and the bearing body are hinged through the corresponding drilling pressure torque deflection transmission mechanisms. By means of the high-precision short-radius rotary steering drilling tool, drilling, measurement and steering under the short-extremely-short-radius well hole condition can be effectively achieved, and high-curvature well hole steering drilling or steering drilling of a high-curvature well section extending well hole can be achieved.

The invention discloses an ultrathin vacuum pipe traffic isolation door capable of being embedded in a rail gap. The ultrathin vacuum pipe traffic isolation door capable of being embedded in the railgap comprises a door chamber arranged on a joint of two sections of vacuum pipe, the door chamber comprises an upper half door chamber and a lower half door chamber, an isolation door is arranged in the upper half door chamber, a traction motor is connected to the upper part of the upper half door chamber, the traction motor is connected with the isolation door, thickness of the isolation door isless than 3 mm, and the isolation door is hidden in the lower half door chamber, and the upper edge of the isolation door is parallel and level with and fits tightly with the upper surface of a rail under the opening condition of the isolation door; and when the isolation door needs to be closed, the isolation door is lifted upward until the isolation door is totally closed on a corresponding fracture surface in the vacuum pipe. According to the ultrathin vacuum pipe traffic isolation door capable of being embedded in the rail gap, a driving mode of the isolation door driving a linear motor may be adopted to drive the isolation door to move upward and downward, and the ultrathin vacuum pipe traffic isolation door capable of being embedded in the rail gap is suitable for a plurality of railforms, guarantees that a train moves smoothly and steadily, is of a light structure, has low cost of material consumption, and is convenient to open and close rapidly.