10results about How to "Reduce the overall diameter" patented technology

The present invention relates to a conveyor roller assembly suitable for use in environments subject to significant temperature variations and an integrated end cap. The integrated end cap ensures efficient torque transfer to the ceramic coil thanks to its resilience resulting from the deformation of the end cap during its assembly onto the ceramic coil.

The utility model discloses a novel heliostat stand column relates to tower type solar thermal power generation technical field, including the stand column body and the flange disc of setting at the top of stand column body, and the stand column body is the tubular structure of upper and lower port through and overall hollow, and the stand column body bottom part inserts the concrete, and the stand column body bottom part is located in the concrete and is provided with the opening section, and the opening section is uniformly distributed with a plurality of weight reduction holes for improving and the concrete bonding degree on the circumference array. The stand column body of the utility model adopts the circular thin -walled pipe structure design, reduces the stand column diameter and wall thickness, and the material and transportation cost are reduced significantly. The opening section is equipped with the circumferential distribution's strip or circular weight reduction hole, can improve the bonding degree of concrete and steel stand column, reaches the purpose that steel stand column and concrete integration works, effectively promotes the torsional and tensile capacity of stand column.

The application provides a method for installing a berthing component, and belongs to the technical field of berthing component installation. The method uses a manual chain block to realize secondary lifting of the berthing component, thereby adjusting the height position of the berthing component and improving the position accuracy of the berthing component. Moreover, the manual chain block is used to directly lift the berthing component relative to hoisting equipment (a square barge crane), and the use of the manual chain block can ensure that the berthing component moves in the vertical direction and does not move in the horizontal direction. Meanwhile, since the manual chain block is used to lift the berthing component, the distance between the lifting point of the manual chain block and the berthing component is small, so the amplitude of the swing of the berthing component caused by the action of side wind is small, thereby facilitating the adjustment of the position of the berthing component and improving the use experience of the product.

Embodiments of a radially collapsible and expandable prosthetic heart valve (10) are disclosed. A valve frame (12) can have a tapered profile when mounted on a delivery shaft, with an inflow end portion having a smaller diameter than an outflow end portion. The valve can comprise generally V-shaped leaflets (40), reducing material within the inflow end of the frame. An outer skirt (18) can be secured to the outside of the inflow end portion of the frame, the outer skirt having longitudinal slack when the valve is expanded and lying flat against the frame when the valve is collapsed. A diagonally woven inner skirt (16) can elongate axially with the frame. Side tabs (116) of adjacent leaflets can extend through and be secured to window frame portions (30) of the frame to form commissures. The window frame portions can be depressed radially inward relative to surrounding frame portions when the valve is crimped onto a delivery shaft.

This application relates to the field of pile foundation technology, specifically providing an anti-tension pile and its construction method. The anti-tension pile includes: a pile body having an embedded section inserted into the ground and a side surface connected to the embedded section; an anti-tension mechanism disposed on the embedded section, the anti-tension mechanism including a plurality of anti-tension plates, all of which can extend and retract radially along the pile body; and a rotating shaft rotatably connected to the pile body, with one end of the rotating shaft connected to the anti-tension mechanism. The rotating shaft drives the anti-tension plates to extend and retract radially by rotating, so that the plurality of anti-tension plates extend or retract relative to the side surface. By rotating the rotating shaft, the anti-tension plates are driven to extend and retract radially. When the plurality of anti-tension plates extend relative to the side surface, the contact area between the anti-tension pile and the soil increases, thereby improving the bearing capacity of the anti-tension pile. This can reduce the length or diameter of the anti-tension pile while ensuring the bearing capacity, thus reducing costs. When the plurality of anti-tension plates retract relative to the side surface, the anti-tension pile is easier to pull out and retrieve.

A catheter assembly (10) comprising a catheter (18), a needle (12) having a sharp distal tip (13), and a catheter hub (14) connected to the catheter (18) having the needle (12) passing therethrough, the catheter hub (14) including a valve (19) having a preformed opening (22) that selectively permits or blocks a flow of fluid through the catheter (18), a first inner diameter (32) that closes the valve (19), and a second inner diameter (30) larger than the first inner diameter (32), the second inner diameter (30) opening the valve (19), wherein the valve (19) is in an open position upon axially compressing the valve (19) into engagement with the second inner diameter (30) of the catheter hub (14), and the valve (19) is in a closed position upon releasing the valve (19) to engage the first inner diameter (32) of the catheter hub (14).

Embodiments of a radially collapsible and expandable prosthetic heart valve (10) are disclosed. A valve frame (12) can have a tapered profile when mounted on a delivery shaft, with an inflow end portion having a smaller diameter than an outflow end portion. The valve can comprise generally V-shaped leaflets (40), reducing material within the inflow end of the frame. An outer skirt (18) can be secured to the outside of the inflow end portion of the frame, the outer skirt having longitudinal slack when the valve is expanded and lying flat against the frame when the valve is collapsed. A diagonally woven inner skirt (16) can elongate axially with the frame. Side tabs (116) of adjacent leaflets can extend through and be secured to window frame portions (30) of the frame to form commissures. The window frame portions can be depressed radially inward relative to surrounding frame portions when the valve is crimped onto a delivery shaft.

A wide-angle lens which easily and appropriately corrects various aberrations such as field curvature, magnification chromatic aberration, and coma aberration, and easily achieves miniaturization of the entire wide-angle lens. The wide-angle lens of the present invention includes, in order from the object side, a first lens which is a negative lens with a concave image side lens surface, a second lens which is a negative lens with a concave image side lens surface, a third lens which is a positive lens with a convex image side lens surface, a fourth lens which is a positive lens with a convex image side lens surface, a fifth lens which is a positive lens, a sixth lens which is a negative lens, and a seventh lens which is a positive lens, and satisfies the following relationship when a focal length of the third lens is set as f3 and a focal length of the entire wide-angle lens is set as f: 3.000 < f3 / f < 12.500.

The present application belongs to the field of catalytic conversion of crude oil, and particularly relates to a method for preparing olefins and aromatic hydrocarbons by catalytic cracking of crude oil, which realizes two-component separation of crude oil and heat coupling reaction of catalytic cracking; the crude oil is first separated into two components according to the true boiling point, the heavy component or the component with high true boiling point, i.e. the high-boiling liquid-phase component of the crude oil, is subjected to catalytic cracking in a first reactor, and the product gas separated from the catalyst is subjected to second-stage catalytic cracking in a second reactor with higher temperature; the light component or the component with low true boiling point, i.e. the gaseous stream of the crude oil, directly enters the second reactor for catalytic cracking in the gaseous phase; and the catalyst after the reaction of the second reactor is relayed into the first reactor to continue participating in the first-stage catalytic cracking of the first reactor, forming relayed use of the catalyst.

The application provides a structure for reducing the flow resistance of a bearing cavity ventilation pipe, wherein the ventilation pipe is configured with an oil blocking structure protruding from the bearing cavity wall surface by a predetermined distance at one end of the ventilation pipe extending into the bearing cavity, the oil blocking structure is used for blocking the lubricating oil of the bearing cavity wall surface from entering the ventilation pipe along the ventilation air, and the lubricating oil of the bearing cavity wall surface cannot enter the ventilation pipe by gravity after being blocked. The scheme provided by the application significantly reduces the lubricating oil entering the ventilation pipe, significantly reduces the flow resistance of the ventilation pipe without increasing the diameter of the ventilation pipe, is beneficial to reducing the pressure of the bearing cavity, improves the sealing pressure difference under the condition that the sealing induced air pressure is the same, and prevents lubricating oil leakage.