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203results about How to "Small space" patented technology

Roof water control method based on presplitting and grouting modification

ActiveCN110761814AReduce water supply capacityInhibition of growth heightUnderground chambersFluid removalSoil scienceHydraulic fracturing
The invention relates to a roof water control method based on presplitting and grouting modification. The roof water control method includes the following steps that first, the height of a water diversion fissure zone on the working surface is determined; second, fracturing and grouting are carried out before determining extraction of the working surface; third, fracturing horizon and grouting horizon are determined; fourth, the fracture and grouting plane range and thickness are determined; fifth, horizontal holes of a roof stratum are subjected to hydraulic fracturing, hydraulic fracturing is carried out on the rock stratum through horizontal branch holes of the construction ground, and an original continuous medium is fractured into a discontinuous medium; and sixth, roof stratum grouting is conducted, and the water-passing capacity of the rock stratum is greatly reduced. Thereby, the roof water control method fractures the rock stratum with good continuity into a discontinuity rockstratum, then a grouting technology is adopted to transform the rock stratum into a relatively weak waterproof protective layer to achieve the dual purposes of inhibiting upward development of the water diversion fissure zone and weakening the permeability of the rock stratum, and thus the water yield of aquifer underground water of a coal roof pouring into the coal face through the water diversion fissure zone is decreased.
Owner:XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP

Unmanned patrol aircraft for power transmission lines

The invention relates to an unmanned patrol aircraft for power transmission lines. The unmanned patrol aircraft comprises an aircraft body, a camera system, a cloud deck, a nanometer battery, an aircraft control system, a wireless transmission system, a GPS positioning system and a ground receiving, controlling and managing system. The unmanned patrol aircraft has four ailerons which are symmetrically installed at two sides of a main beam; the unmanned patrol aircraft has the advantages of stable flight, a fast flight speed, high flexibility and great loading capacity; front and rear beams are of segmented design, which facilitates adjustment and wiring. The aileron horns of the ailerons are movably connected with an aileron fixing frame through bolts; the aileron fixing frame is equipped with folding positioning seats; the aileron horns rotate with the bolts as centers and are limited through the folding positioning seats; such a structure enables the aileron horns to be parallely drawn close onto the main beam after folding, so the unmanned patrol aircraft has a small size and is easy to carry. After the front and rear aileron horns are open, lines among center points of four motors on the front and rear aileron horns form a square, and such a structure enables the aircraft to maintain balanced flight and to have reduced current loss and long flying time.
Owner:STATE GRID CORP OF CHINA +1

Preparation method of carbon nanotube-alumina composite reinforced magnesium-based composite material

The invention discloses a preparation method of a carbon nanotube-alumina composite reinforced magnesium-based composite material, which relates to the manufacture of magnesium-based alloy by using a casting method. The preparation method comprises the steps of: step 1, calcining and reducing raw materials of ferric nitrate nonahydrate and alumina in the ratio of (0.07-1.00):1 to obtain an iron / alumina composite catalyst, and finally, performing catalytic pyrolysis reaction by using the mixed gas of nitrogen gas and ethylene in the volume ratio of (6-12):1 for uniformly dispersing carbon nanotubes on the surface of the alumina, so as to prepare a carbon nanotube-alumina composite reinforced phase; and step 2, adding the carbon nanotube-alumina composite reinforced phase to a molten magnesium base material, and stirring and casting to prepare the carbon nanotube-alumina composite reinforced magnesium-based composite material, wherein the added carbon nanotube-alumina composite reinforced phase accounts for 1-15% of the molten magnesium base material by mass percentage. According to the invention, the defect of a magnesium-based alloy texture in the magnesium-based composite material produced in the prior art is overcome, the excellent enhancing effect of the carbon nanotubes in a magnesium matrix can be brought into full play, and the comprehensive performance of the magnesium-based composite material is ensured to be enhanced.
Owner:HEBEI UNIV OF TECH +1

Rail transportation system powered by solar energy

The invention relates to a rail transportation system powered by solar energy, which consists of a solar panel, an installation rack, supply rails, rails for the running of vehicles and rail vehicles or road vehicles which are provided with collectors and are driven by motors. The rail transportation system is characterized in that the solar panel and the supply rails are arranged above the rails or on both sides of the rails through the installation rack; the vehicles run on lines are contacted with the supply rails through the collectors to provide electrical power for the vehicle-mounted motors to drive the vehicles; and the rail transportation system can meet the requirement of the running of the vehicles on high-speed rails of over 300 kilometers. A solar interval power-supply system consists of a plurality of continuous disconnected and independent power-supply intervals, can provide the electric power for the rail vehicles and automobiles which are provided with the collectors and are driven by the motors, and overcomes the defects of large installation space of storage cells, and excessive increment of dead weight and short driving range of pure electric automobiles, so that the pure electric automobiles and dual-mode vehicles can be widely applied on a large scale; and in addition, when automobiles with light-weight steel wheels are run on steel rail lines, energy can be saved by 40 to 70 percent, and thus the solar interval power-supply system can save the energy and protect environment.
Owner:HEFEI BOPU HIGH TECH
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