5results about How to "Avoid wasting manpower and material resources" patented technology

The invention belongs to the technical field of water quality remote sensing monitoring, and particularly relates to a sky-ground remote sensing integrated lake and reservoir water quality parameter quantitative inversion method. Qualitative inversion is carried out on water quality parameters through medium-high resolution satellite remote sensing images, and ground sampling points are reasonably arranged. And carrying out ground and air collaborative operation, including on-site water body sampling and unmanned aerial vehicle flight, so as to ensure the consistency of sampled water quality parameters and unmanned aerial vehicle image spectral characteristics. The sampling point water body sample is sent to a laboratory to be tested, and measured data are obtained. An unmanned aerial vehicle image is subjected to preprocessing including splicing and radiation correction, and a reflectivity image map is obtained. Water vector data are extracted by using an unmanned aerial vehicle image, a remote sensing quantitative inversion model of water quality parameters is established, and the model is analyzed and optimized through an optimal wave band combination. And in combination with the unmanned aerial vehicle image, the inversion model and the water body vector data, obtaining a water quality parameter quantitative inversion result and spatial distribution characteristics in the lake and reservoir range. The method can improve ground sampling rationality and time coordination of lake and reservoir water quality monitoring, and supports long-term high-precision dynamic monitoring.

The present application belongs to the technical field of coal spontaneous combustion prevention and control in the goaf of underground coal mining face, and specifically relates to a multi-point self-feedback inerting integrated variable frequency injection and spraying fire prevention and extinguishing method for the goaf of coal mine. The method comprises the following steps: calculating the required nitrogen injection flow for fire prevention and extinguishing in the goaf of working face; calculating the required amount of retardant to be sprayed in each cycle of inerting fire prevention in the goaf of working face; performing injection and spraying operation according to the injection amount and retardant amount calculated in steps 1 and 2 respectively as one injection and spraying cycle per shift; determining the oxygen content of each monitoring point of the goaf tube; calculating the average oxygen concentration of the oxidation zone of the goaf according to the oxygen content of each monitoring point, and then calculating the new nitrogen injection flow to correct the nitrogen injection flow in step 1, and adjusting the nitrogen injection flow of the injection and spraying system in step 3 to perform injection and spraying operation; monitoring the CO and C2H4 gas concentrations in real time during injection and spraying operation; if the CO and C2H4 gas concentrations exceed the standard, dynamically adjusting the nitrogen injection flow and the retardant concentration to perform injection and spraying operation.

This invention belongs to the field of flood drainage and seepage technology for valley ash dumps. It proposes a composite flood drainage and seepage system and method for use in power plant valley ash dumps. The invention includes a drainage ditch set along the direction from the flood control dam towards the initial dam of the ash dump. The drainage ditch includes a flood drainage culvert at the bottom of the ash dump, a seepage ditch and a flood drainage ditch located above the flood drainage culvert. The bottoms of the seepage ditch and the flood drainage ditch share a common pool wall with the upper part of the flood drainage culvert. The adjacent side walls of the seepage ditch and the flood drainage ditch also share a common pool wall. This effectively reduces the foundation treatment area and land occupation, as well as the amount of steel reinforcement and concrete used, thus lowering the project cost. Simultaneously, the flood drainage ditch has an opening at its upper part and a cover plate placement groove. A seepage pipe is installed at the end of the drainage ditch away from the flood control dam. This system is suitable not only for flood drainage and seepage when upstream floodwaters flow into the ash dump along the slopes of both banks, but also for flood drainage and seepage under conditions of high rainfall.

The invention relates to helicopter design, in particular to a power cabin fire extinguishing agent concentration distribution calculation method. Numerical calculation is adopted to directly simulate the concentration distribution of the fire extinguishing agent in the power cabin, the calculation period is long, the concentration distribution of the fire extinguishing agent in the power cabin is rapidly obtained, numerical calculation and a theoretical analysis method are combined, the method is used for calculating the concentration distribution of the fire extinguishing agent, an instantaneous point source concentration equation when wind exists is constructed through Matlab, and if other fire extinguishing agents are replaced, the calculation period is short. A new fire extinguishing agent concentration diffusion solution can be established by modifying a diffusion system lamp associated with the fire extinguishing agent. For different models, power cabins and engine accessories are simplified, and after a power cabin model is obtained, fire extinguishing agent concentration distribution can be solved according to the method. The method can be applied to rotor wing or fixed wing fire extinguishing agent concentration solving.

The invention discloses a scraping and grinding sequence combined grinding device for a large rotary table and belongs to the technical field of machining tools. The device comprises a support and is characterized in that a roller frame is connected to the top face of the support, the support and the roller frame are welding parts and are formed by welding tubular steel and plate steel together, a fixing shaft is fixed to the roller frame, the fixing shaft is sleeved with a rotatable roller, and a plurality of unthreaded holes are formed in the bottom of the support. The lifting machine can serve as a power source, the problem that manpower and material resources are wasted due to the fact that the large rotary table is dragged completely by manpower is solved, and the assembly efficiency of the large rotary table is improved.