43results about How to "Reduce attachment time" patented technology

Heart valve attachment apparatus and methods that significantly reduce attachment times are provided. The apparatus and methods utilize a connector band to form an interface between a uni-directional valve and a tissue annulus. The connector band is secured to the tissue annulus by retention fingers.

The invention discloses a method for selectively breeding bivalve shellfish at an attachment stage, which comprises the following steps of: putting synchronous fertilized eggs of the bivalve shellfish into a nursery pond to perform culture till the fertilized eggs are grown to a veliger stage; when 30 to 40 percent of larvae have eye spots, putting attachment matrixes into the nursery pond; determining the times and amount of fed baits every day according to the condition of larva stomachs under a microscope; changing the water once to twice every day; when the attachment rate of the larvae is 10 to 30 percent, taking the attachment matrixes attached with the larvae out to perform separate culture; and breeding the larvae taken out in the previous step at a reduced temperature, reducing the temperature by 1 to 2 DEG C every day till the temperature is reduced to the temperature of natural seawater, and directly culturing the larvae on the sea. The invention provides the efficient and large-scale selective breeding method, which solves the problems of small basic population scale of selectively breeding the bivalve shellfish, high selective breeding cost, difficult process operation, single selective breeding target and the like.

The invention discloses a diffusion pump, and particularly relates to a large-caliber high vacuum oil diffusion pump, which is suitable for a vacuum furnace and a vacuum coating machine. The large-caliber high vacuum oil diffusion pump comprises a pump body, and a pump core component arranged in the pump body, wherein a heater is arranged at the bottom of the pump body; an oil stop device is arranged in an exhaust port of the pump body; the pump body adopts a convex cavity structure; the pump core component is vertically mounted in a center oil tank in the pump body, and is formed into an integral structure by a first-stage guide pipe, a second-stage guide pipe and a third-stage guide pipe arranged in sequence from inside to outside; umbrella cap-shaped diffusion nozzles are respectively arranged at the upper parts of all the guide pipes; a spraying nozzle is vertically welded at the bottom of the third-stage guide pipe; the first-stage guide pipe is higher than the second-stage guide pipe; and the second-stage guide pipe is higher than the third-stage guide pipe. The large-caliber high vacuum oil diffusion pump has the characteristics of large caliber, high limit vacuum degree, high pumping rate, low oil return rate and low electricity consumption.

The invention relates to a high vacuum oil diffusion pump, in particular to an electromagnetic heating high vacuum oil diffusion pump. According to the electromagnetic heating high vacuum oil diffusion pump, an electromagnetic heater is arranged on the bottom of a pump body; a water-cooling oil blocking device is arranged on the exhaust port of the pump body; a straight cavity structure is adopted by the pump body; a water channel type cooling jacket is arranged outside the pump body; a pump core assembly is vertically mounted at the center position inside the pump body; the pump core assembly structurally comprises an umbrella-shaped first-stage nozzle cap, an umbrella-shaped second-stage nozzle cap, a umbrella-shaped third-stage nozzle cap and a third-stage flow guide pipe from inside to outside in sequence to form a whole structure; flow guide pipes are respectively arranged on all umbrella-shaped nozzle caps; a first-stage diffusion flow guide pipe is vertically welded at the internal center position of the third-stage flow guide pipe; the first-stage flow guide pipe is higher than a second-stage flow guide pipe; and the second-stage flow guide pipe is higher than the third-stage flow guide pipe. The electromagnetic heating high vacuum oil diffusion pump has the characteristics that the heating speed is rapid; the cooling speed is rapid; the effect is good; the oil return rate is low; the ultimate vacuum is high; the exhausting rate is high; the electricity consumption is low; and the time to reach ultimate vacuum is short.

The invention discloses a piece pasting device of a back plate shading piece pasting machine. A rack is included, and the left side and the right side of the top end of the rack are in screw connection with a piece pasting mechanism and a positioning mechanism correspondingly; the front end and the rear end of the right side of the top end of the rack are in screw connection with a feeding mechanism and a discharging mechanism correspondingly; the piece pasting mechanism comprises two guide rails; the bottom ends of the two guide rails are in screw connection with the front end and the rear end of the left side of the top end of the rack correspondingly; the left side of the outer wall of each guide rail is sleeved with a linear slider; the top ends of the linear sliders are in screw connection with vertical plates; the top ends of the vertical plates are in screw connection with a shell; a first guiding rod is inserted and connected in the left side of an inner cavity of the shell inthe front-back direction; and the right end of the front side of the shell is in screw connection with a motor. The piece pasting device of the back plate shading piece pasting machine can achieve one-time pasting of shading pieces, the pasting time is shortened, the machining efficiency is improved, and the automatic large-batch production requirement is greatly met.

The invention discloses an intelligent polarizer attaching device in the technical field of liquid crystal displays, which includes a top plate and a bottom plate. A sliding plate is slidably connected to the top plate through a driving structure, and the bottom of the sliding plate is connected to a moving frame through an electric push rod. An extruding frame is slid in the moving frame, and a fixed plate is slidably connected in the extruding frame, and the shaft driving the electric push rod sticks the adsorbed polarizer on the glass substrate, and the polarizer touches the substrate through the extruding frame , the attached component generates potential energy and expands to both sides of the interference plate, and its bottom contacts the polarizer to make it closely adhere to the surface of the glass substrate. Compared with the traditional attachment device, polarizer attachment greatly saves the attachment time, improves the attachment efficiency, and also eliminates the air bubbles generated when attaching the polarizer.

The invention belongs to the field of chemical industry, and discloses a method for synthesizing acetone condensate from acetone and hydrogen. The method comprises: mixing acetone and hydrogen, entering into a high-gravity rotating bed, and mixing with a rotor arranged on the high-gravity rotating bed. The catalyst bed layer is contacted, and after the reaction, a liquid phase component and a gas phase component containing acetone condensate are obtained; the residence time of the liquid phase component in the catalyst bed layer is τ≤20s. The present invention introduces a high-gravity rotating bed reactor into the reaction of acetone and hydrogen one-step synthesis of acetone condensation products, significantly reduces the residence time of liquid products in the catalyst bed, and alleviates / eliminates the prolongation of the reaction time. The phenomenon of carbon deposition and coking prolongs the service life of the catalyst, and at the same time changes the conversion rate of reactants and the selectivity of products.