31results about How to "Load control" patented technology

The invention discloses a steel fiber feeding and dispersing device and a dispersing method. A conveyor belt is arranged in a steel fiber conveying and dispersing arm, and the bottom surface of one end of the steel fiber conveying and dispersing arm is arranged at the upper end of a dispersing support column; a dispersing hopper is arranged on the end head of the steel fiber conveying and dispersing arm, and a discharge port is formed in the bottom surface of the other end of the steel fiber conveying and dispersing arm; a blanking cage is arranged in the dispersing hopper, and the blanking cage is driven by a blanking cage motor arranged outside the dispersing hopper to rotate; scrapping rake teeth are arranged on cage ribs of the blanking cage in disorder, the blanking cage continuouslyrotates, the steel fibers stacked at the upper part of the blanking cage are continuously racked off by the scraping rake teeth, and the dropped steel fibers are dispersed on the conveyor belt throughthe blanking cage; a rotary rocker arm support rack is arranged the dispersing support column corresponding to the lower part of the steel fiber conveying and dispersing arm, and the bottom surface of one end of a steel fiber rotary rocker arm is arranged at the outer end part of the rotary rocker arm support rack; a steel fiber receiving hopper is arranged on the end head of the steel fiber rotary rocker arm.

The invention provides a radial loading device for a bearing performance test experimental platform, which mainly arranges a radial loading device on a platform corresponding to a stepped shaft. The radial loading device is mainly provided with a vibration motor and a vibration isolating assembly on the upper and lower sides of a base frame. The base frame includes a base frame top cover and a base frame body. The base frame body and the base frame top cover are opposite to each other and form a complete circle for holding the stepped shaft, the opening of a base frame vertical plate is internally provided with the vibration motor, a pneumatic cylinder is connected below a base frame horizontal plate connected to the vibration motor, the pneumatic cylinder is connected to a base through abottom connection member, and the lower ends of the base bottom plate are arranged in two sliding slots in parallel of a test platform. The invention can convert the exciting force of the vibration motor and the constant force of the pneumatic cylinder into the load force on the stepped shaft of the tested bearing, and can regulate the load force on the stepped shaft by adjusting the vibration frequency, the amplitude and the overall position of the vibration motor, thereby greatly facilitating the experimental research and exploration of bearing support characteristics.

A gas diffusion electrode carried with a double-shell core-shell catalyst consists of a gas diffusion layer and a core-shell catalyst layer obtained on the gas diffusion layer in situ. A catalyst in the catalyst layer is the double-shell core-shell catalyst using a carbon-supported Pd alloy catalyst as a core, using Pt located on the surface as an outer shell and using Au located between the Pt shell and an alloying inner shell. A preparation method comprises three steps of (1) preparing the gas diffusion layer, (2) preparing the inner shell of the Pd alloy catalyst and (3) preparing the core-shell catalyst layer. When the gas diffusion electrode serves as a gas diffusion cathode for a metal air fuel cell, a proton exchange membrane fuel cell and a direct liquid fuel cell, the gas diffusion electrode has the advantages of being low in precious metal carrying capacity, high in utilization ratio, good in stability and the like, can remarkably reduce the fuel cell cost and is easily produced in a batch mode. In addition, the preparation method is simple and easy to operate.

The invention belongs to the technical field of preparation, relates to preparation of supported palladium / carbon catalyst and particularly relates to a method for preparing supported palladium / carbon catalyst through self-polymerization of dopamine, and application. The method for preparing the supported palladium / carbon catalyst through self-polymerization of dopamine comprises the steps of enabling metal precursor chloropalladite and DA to automatically carry out oxidation-reduction reaction in an alkalescence (pH 8.5) environment, thereby obtaining Pd / PDA compound; and carbonizing Pd / PDA compound in inert atmosphere (N2), thereby obtaining the supported Pd / C(PDA) catalyst. The preparation method disclosed by the invention is very simple, is few in step and convenient in operation. Through control of input of the metal precursor, the capacity of precious metal can be controlled. The supported palladium / carbon catalyst prepared by the method has excellent activity for electrocatalytic oxidation of methanol in the alkaline environment and has good application prospect in the field of a low-temperature methanol fuel cell.

The invention belongs to the technical field of biomedical materials, and discloses a graphene / calcium phosphate ceramic composite stent with antibacterial function and a preparation method. In the preparation method of the present invention, the porous calcium phosphate ceramic is placed in a graphene-based material solution of a certain concentration, the graphene is adsorbed on the surface and pores of the porous calcium phosphate ceramic by vacuum perfusion, and the graphene / calcium phosphate ceramic is obtained after drying treatment. Composite bracket. The graphene / calcium phosphate ceramic composite scaffold prepared by the invention not only has good osteoinductive properties, but also has good antibacterial activity, and is expected to have broad application prospects in the regeneration and repair of clinical infectious bone defects.

The invention relates to a method for preparing fuel particles. The method comprises the steps: supplying a spherical core, performing formation of a porous silicon carbide layer or a zirconium carbide layer on the core through chemical vapor deposition so as to obtain porous silicon carbide layer / zirconium carbide layer-coated particles, soaking the porous silicon carbide layer / zirconium carbidelayer-coated particles in an active liquid for vacuum impregnation so as to obtain compound-filled porous silicon carbide layer / zirconium carbide layer-coated particles, and decomposing compounds which are filled in the compound-filled porous silicon carbide layer / zirconium carbide layer-coated particles so as to form combustible neutron-poison oxides or thorium oxide and finally obtain the fuel particles. The invention also provides core-shell fuel particles prepared by using the method. The fuel particle safety which is stack safety is improved through coating of the silicon carbide layer orthe zirconium carbide layer outside the core, and meanwhile the stack economy can be improved through the combustible neutron-poison oxides or thorium oxide filled in the silicon carbide layer or zirconium carbide layer.

The invention relates to a preparation method of an Ir and Ir-Pt / C alloy nano-catalyst with high dispersion and high load capacity by using carbon black as a carrier and Ir or Ir-Pt alloy nanoparticles as an active ingredient. The preparation method of the Ir and Ir-Pt / C alloy nano-catalyst with high dispersion and high load capacity is characterized in that a high-pressure hydrogen reduction method is utilized, and the carbon black modified by KBH4 is used as the carrier to reduce an Ir or Ir-Pt precursor compound; and the Ir or Ir-Pt alloy nanoparticles are deposited on the surface of the modified carbon black to obtain the Ir / C or Ir-Pt / C catalyst with high dispersion and high load capacity. The catalyst obtained by using the method of the invention has high Ir or Ir-Pt load ratio, controllable Ir or Ir-Pt load capacity, low cost, simple process and low equipment requirement and can prepare the Ir / C or Ir-Pt / C catalyst with the mass ratio ranging from 5 percent to 4 percent. The Ir / C or Ir-Pt / C nano-catalyst can be applied to chemical process, fuel batteries, aerospace engineering, pollution and emission control, biological engineering, and the other fields .

The invention belongs to the field of preparation of biological plasticizers and relates to a clay-based solid catalyst for green synthesis of a novel biological plasticizer C22-cyclolipotri-acid ester and a preparation method thereof. The preparation method comprises the following steps: adopting silicate clay and zinc oxide as materials, adopting an equivalent-volume impregnation method to load a proper amount of zinc oxide into inner holes of the silicate clay; then drying to remove a solvent, and by the action of roasting and activation, and obtaining the catalyst for synthesis of the clay-based C22-cyclolipotri-acid ester. The prepared solid catalyst is easily separated from products, so that the corrosion to equipment and the pollution to the environment are reduced; in the loading type catalyst, ZnCl2 and the surface of clay generate chemical bonding action to form a new amorphous substance, and the activity is larger than the sum of the activity of the ZnCl2 and the activity of the clay.

The invention discloses a manganese dioxide modified biochar composite material as well as a preparation method and an application thereof. The composite material is prepared from manganese dioxide and biochar by loading generated manganese dioxide on biochar through the neutralization reaction of permanganate and manganese in divalent manganese salt. The manganese dioxide modified composite material has the advantages of high adsorption capacity for heavy metal lead or cadmium, obvious adsorption effect, low preparation cost and the like, and is an ideal heavy metal wastewater adsorbent; thepreparation method of the composite material has the advantages of simple process, cheap raw materials, sufficiently used raw materials, low production cost and the like. The manganese dioxide modified composite material can be used for treating heavy metal wastewater, and has the advantages of high adsorption capacity for heavy metals, high adsorption efficiency, low toxicity to organisms in theenvironment and the like, and can be produced and applied on a large scale.