99results about How to "No axial movement" patented technology

The invention belongs to the technical field of centering devices for drilled holes and provides a rapid center drilling fixture. The center drilling fixture comprises a base which is divided into a base plate and a vertical plate; a vertical height adjusting groove is formed in the vertical plate; a positioning shaft capable of moving up and down is arranged in the height adjusting groove; the positioning shaft is locked with the height adjusting groove by use of a locking nut; an upper V-shaped block, a middle V-shaped block and a lower V-shaped block are coaxially arranged on the vertical plate; the height adjusting groove is located between the V angles of all the V-shaped blocks, wherein a pressing plate is hinged to the middle V-shaped block and matched with the V angle of the middle V-shaped block to form a workpiece clamping part. According to the rapid center drilling fixture, the pressing plate is turned to rapidly clamp and release shaft parts; the rapid center drilling fixture is greater than a triangular chuck in clamping force; besides, the clamping time of the shaft parts is shortened; the rapid center drilling fixture is suitable for center drilling of a batch of shaft parts.

The invention relates to a horizontal type multilevel vortex pump which comprises a pump body, a rotor part connected with three groups of vortex pump impellers, and two bearing bodies, wherein the two bearing bodies are connected onto two ends of the pump body respectively; the rotor part is rotatably arranged in the pump body in a penetrating manner; two ends of the rotor part are connected with the bearing bodies respectively; a water inlet and a water outlet are formed in the outer sides of the pump body respectively; a water inlet section chamber, a middle section chamber and a water outlet section chamber communicated with each other are sequentially arranged in the middle of the pump body; the three groups of vortex pump impellers are positioned in the water inlet section chamber, the middle section chamber and the water outlet section chamber respectively; the water inlet section chamber is communicated with the water inlet; the water outlet section chamber is communicated with the water outlet; the water inlet section chamber and the middle section chamber are vortex pump type chambers; the vortex pump impellers are provided with corresponding back blades. The horizontal type multilevel vortex pump is not provided with a sealing ring, so that the horizontal type multilevel vortex pump has no sealing operation interval and can avoid the problem that the performance of the pump is declined due to increased operation interval of the pump body and the impellers after abrasion.

The invention relates to a securing element (1) for securing a component to a securing base, having a shank (2) which has an external thread (6) and an expansion body (7), an expansion element (3) which is arranged in an axially movable manner on the shank (2) and which can be expanded by moving axially on the shank (2) by means of the expansion body (7), and a nut (4) which has an internal thread (15) and which is arranged on the external thread (6) of the shank (2). The application of a torque enables the nut (4) to be rotated on the external thread (6) such that the expansion element (3) is moved against the expansion body (7) by means of the nut (4). According to the invention, in order to simplify the mounting of the securing element (1), the internal thread (15) is designed such that the external thread (6) is released after expansion of the expansion element (3) such that the nut (4) can rotatable substantially without axial movement on the shank (2).