37results about How to "Reduce loading difficulty" patented technology

The present application relates to a transcatheter valve replacement system. The system includes a valve replacement prosthesis, a delivery catheter, a control handle and an anchoring device; the valve replacement prosthesis includes a valve stent, an artificial valve leaflet and an adaptive covered stent, the artificial valve leaflet is arranged in the valve stent, the adaptive covered stent is connected to the outer periphery of the valve stent, the valve replacement prosthesis is provided with an anchored unit, and the anchored unit is fixed to heart tissue by the anchoring device; and theanchoring device is arranged in the delivery catheter, the anchoring device includes an anchoring needle, an anchoring needle catheter, an anchoring needle push rod, and a controllable guiding device,the anchoring needle is pre-installed in the distal end of the anchoring needle catheter, the distal end part of the anchoring needle catheter has a flexible structure, one end of the controllable guiding device is detachably connected to the anchored unit, and the controllable guiding device can control the distal end part of the anchoring needle catheter to form a fixed bend angle in the radialdirection and make the distal end of the anchoring needle catheter adhered to the anchored unit.

A conveyor includes an inner core assembly and a restraining piece. The restraining piece is rotatably arranged in the inner core assembly, the restraining piece sequentially comprises a fixing ring, a connecting rib and a clamping section from the near end to the far end, the two ends of the connecting rib are connected with the fixing ring and the clamping section respectively, the fixing ring is rotatably arranged in the inner core assembly, the clamping section has a contraction configuration and an expansion configuration, and in the contraction configuration, the clamping section is used for clamping the near end of the blood flow guiding support between the inner core assembly and the clamping section, the friction coefficient of the surface, close to the inner core assembly, of the clamping section is larger than that of the surface, away from the side of the inner core assembly, of the clamping section, and in the expansion configuration, the clamping section is separated from the blood flow guiding support. According to the conveyor, the blood flow guiding support can be prevented from twisting and slipping in the conveying process, the pushing resistance is small, and loading is easy. The invention further provides a blood path guiding support system.

The invention discloses an integral catalyst for preparing chlorine by catalytic oxidation of hydrogen chloride and an application of the integral catalyst. The catalyst comprises the following components in percentage by mass: 5-15% of transition metals, 3-5% of an alkali metal, 2-5% of a rare earth metal and the balance of a carrier, wherein and the transition metals are Cu and V, the ratio of Cu to V is 4:1-6:1, the alkali metal is potassium, and the rare earth metal is Ce, La or Pr. The catalyst can be used for preparing chlorine by catalytic oxidation of hydrogen chloride. The applicationmethod comprises the following steps: (1) filling a reaction tube with a plurality of the catalysts with different activity levels, wherein the activity levels are increased from the gas inlet end tothe gas outlet end of the reaction tube; and (2) sending hydrogen chloride and oxygen into a fixed bed reactor for a reaction. According to the invention, heat accumulation at the hot spots can be effectively inhibited, the chlorine yield is high, non-uniform distribution of a fluid on a reaction bed layer can be eliminated, pressure drop is reduced, catalyst filling difficulty is reduced, and manufacturing difficulty and manufacturing cost of the reactor are reduced.

The invention provides an automatic tray loader for a ceramic insertion core. The automatic tray loader comprises a rack, a positive and negative direction regulating mechanism, an insertion core conveying mechanism, an insertion core tray-loading mechanism and a tray loading platform, wherein the positive and negative direction regulating mechanism is fixedly connected with the rack for regulating positive and negative directions of the insertion core for correctly loading the insertion core into a tray; the insertion core conveying mechanism is fixedly connected with the positive and negative direction regulating mechanism and is used for loading the insertion core conveyed from the insertion core conveying mechanism into the tray; and the tray-loading platform is positioned below the insertion core tray-loading mechanism and is used for placing the insertion core loaded into the tray through the insertion core tray-loading mechanism. The automatic tray loader for the ceramic insertion core provided by the invention can be used for automatically separating the ceramic insertion cores in positive and negative directions and then loading the ceramic insertion cores into the tray, so that the problems that a conventional ceramic insertion core tray-loading process is purely manual, processing efficiency is low, labor intensity is great, consumed time is long and wrong tray-loading is easily caused are avoided.

The invention discloses a test device of a concrete shear creep coefficient and a test method thereof. The test device comprises a bracket which is used for supporting a long edge of a cross beam specimen, so that the support end of the cross beam specimen rotates along a support line, wherein a loading bracket is arranged on the other long edge of the specimen; a loading weight is placed on the loading bracket; and a strain transducer is respectively arranged at the intersected position at the center of the cross beam specimen along the long edge, and conveys the collected signal to a collection case through a lead. The test method comprises the following steps: casting the specimen into the cross beam specimen, and measuring compressive strain and tensile strain in idle load; mounting the loading bracket on which the loading weight is placed, and measuring the compressive strain and the tensile strain after loading; computing the elastic strain of the load age by comparing with the numerical value in idle load; obtaining the elastic strain at any moment by long-term continuous collection; finally computing the shear creep coefficient according to the formula. Thus, reverse loading is carried out through the bending of the cross beam; the test device and the test method are simpler, more convenient and safer to operate.

The invention provides a method for determining the fatigue test load of an engine main shaft, which solves a problem that the rotating bending moment load cannot be loaded on the ordinary fatigue test machine in the shaft fatigue test through equivalently converting the rotating bending moment load into the vibration torque load, enables small-size shaft parts to be subjected to a fatigue test byusing the ordinary fatigue test machine and does not need to carry out special shaft fatigue tester design, reconstruction or great transformation in allusion to the size of the tested shaft, therebyreducing the cost of the shaft fatigue test, also reducing the test load loading difficulty, and improving the load loading accuracy.

The invention discloses a click preparation method of an allyl cationic cyclodextrin chiral resolution material. The click preparation method comprises following steps: preparation of mono-6-(1-allylimidazole)-cyclodextrin; ion exchange of mono-6-(1-allylimidazole)-cyclodextrin; synthesis of mercapto-silica gel; click chemical reaction for preparation of an allyl cationic cyclodextrin chiral chromatographic separation material. Through the efficient thiol-ene click chemical reaction, mono-6-(1-allylimidazole) cyclodextrin is grafted to the mercapto modified porous silica gel surface, the novel natural allyl cationic cyclodextrin chiral chromatographic separation material is prepared, and an highly universal and effective path is provided for preparation of the chiral resolution material with a stable and controllable structure. The prepared allyl cationic cyclodextrin chiral resolution material can be used for chiral separation of compounds in a reverse chromatography mode, and the separation material has excellent separation capacity for different categories of drugs such as isoxazoline, flavanone, bendroflumethiazide, 4-chromanol and the like.

The invention provides a wind power blade static structure test device and test method, and relates to the technical field of static structure test. The wind power blade static structure test device comprises a bearing platform, and at least one loading mechanism arranged along a preset direction and used for supporting and fixing a blade root part of a wind power blade; and the bearing table is configured to enable the blade tip part of the wind power blade in the preset direction to be higher than the blade root part; so that preset included angle is formed between the connecting line of the blade tip part and the blade root part and the horizontal plane, the loading mechanism is used for applying loading force to the wind power blade, and the loading force is the same as the gravity direction of the wind power blade and the clamp. When the static structure test device for the wind power blade is used for testing the static structure of the wind power blade, the test cost and the loading difficulty of the wind power blade are reduced, and meanwhile, the accuracy of the static test is effectively improved.

The invention discloses a method for filling a catalyst in a tube type fixed bed reactor. The method comprises the following steps of: (1) mounting a plugging spring at the bottom of each reaction tube; (2) filling the catalyst in each reaction tube from the opening at the top of each reaction tube and controlling the rising velocity of the height of each catalyst bed layer as 10-40 mm/s; (3) measuring the pressure drop of each reaction tube; (4) complementarily filling the catalyst in the reaction tubes with the pressure drop lower than an average pressure drop by 3% and controlling the rising velocity of the heights of the catalyst bed layers with complementary filling as 5-10 mm/s; and (5) detaching the plugging springs of the reaction tubes with the pressure drop higher than the average pressure drop by 8% and discharging the catalyst in the reaction tubes. The method for filling the catalyst in the tube type fixed bed reactor, disclosed by the invention, improves the uniformity of the catalyst filled in the reaction tubes and lowers filling difficulty of the catalyst.

The invention discloses a bonding packaging method suitable for a large-size and high-density-structure metal micro-channel radiator. The boding packaging method comprises the steps that 1) a bondingpositioning groove is machined in a packaging cover plate; 2) a cover plate positioning groove and a micro-channel bottom plate positioning groove are machined in a positioning block; 3) a packaging cover plate is positioned and installed through the cover plate positioning groove in the positioning block; metal slurry is coated in a bonding positioning groove in the packaging cover plate; 4) a micro-channel bottom plate is mounted through the micro-channel bottom plate positioning groove in the positioning block and the bonding positioning groove in the packaging cover plate; and 5) elastic pre-tightening is performed on a positioned and aligned packaging body by bolts, oxygen-free high-temperature slurry molting, and cooing and bonding are carried out, and finally a large-size and intensive type metal micro-channel radiator packaging body is obtained. By virtue of the transition layer compensation type bonding packaging method, the technical bottleneck of bonding and packaging of thelarge-size and high-density-structure metal micro-channel radiator is overcome, and high-strength, non-clearance and high-precision metal micro-channel packaging are achieved.