Shandong University

The Boeing Company

The Institute of Metal Research

Liaoning University

Wei Wang

Ke Yang

Yiyin Shan

Wei Yan

Jialong Tian

Yubin Lan

Bingyin Xu

Ke Peng

Jinghua Wang

Yanfei Zhang

Jinliang Gong

Yu Chen

Lin Zhu

Peng Li

Yishan Pan

Xiangming Hu

Di Xue

Yonghui Xiao

Hao Luo

Hongrui Zhao

Kuiyong Liu

Yong Zhou

Kuibin Wu

Liwen Guo

Chuncheng Cai

Xiangdong Yao

Weidong Wang

Fusheng Wang

Wenqi Shao

The present invention relates to the technical field of mine fire prevention and extinguishing, in particular to a liquid nitrogen direct injection and low-temperature foaming intelligent filling system based on mine fire area characteristics and an application method, comprising a liquid nitrogen storage tank, a liquid nitrogen direct injection system and a low-temperature foaming system, wherein the liquid nitrogen storage tank communicates with a liquid nitrogen pressurizing device through a main pipeline; a temperature control unit is arranged on the main pipeline; and the liquid nitrogen pressurizing device is connected with the liquid nitrogen direct injection system and the low-temperature foaming system, respectively, liquid nitrogen is directly injected into a foam liquid, to prepare a low-temperature foam type fire preventing and extinguishing material by means of forced convection, membrane boiling, explosion boiling and nucleate boiling between the liquid nitrogen and water.

Liquid nitrogen direct injection and foaming intelligent filling system based on mine fire area characteristics and application method

Disclosed is a two-layer three-rail planar robot with a parallelogram, including a fixed platform, a moving platform, and three branched chains. Three planar curved rails I are provided on the fixed platform. Three planar curved rails II are fixedly connected to the moving platform. Each planar curved rail I is connected to a planar curved rail II corresponding to the planar curved rail I by one of the branched chains. Each of the branched chains includes a slider I, two connecting rods provided in parallel, a slider II. The slider I is slidably connected to the planar curved rail I. The slider I is rotatably connected to one end of each connecting rod by a revolute pair I, the other end of the connecting rod is rotatably connected to the slider II by a revolute pair II. The slider II is slidably connected to the planar curved rail II.

Two-layer three-rail planar robot with parallelogram

An ultra-high strength maraging stainless steel with nominal composition (in mass) of C≤0.03%, Cr: 13.0-14.0%, Ni: 5.5-7.0%, Co: 5.5-7.5%, Mo: 3.0-5.0%, Ti: 1.9-2.5%, Si: ≤0.1%, Mn: ≤0.1%, P: ≤0.01%, S: ≤0.01%, and Fe: balance. The developed ultra-high strength maraging stainless steel combines ultra-high strength (with σb≥2000 MPa, σ0.2≥1700 MPa, δ≥8% and ψ≥40%), high toughness (KIC≥83 MPa·m1/2) and superior salt-water corrosion resistance (with pitting potential Epit≥0.15 (vs SCE)). Therefore, this steel is suitable to make structural parts that are used in harsh corrosive environments like marine environment containing chloride ions, etc.

Ultra-high strength maraging stainless steel with salt-water corrosion resistance

A single-layer three-section rail-type planar robot containing a double parallelogram, is composed of a stationary platform, a motion platform and three branched chains with the same structure connecting the stationary platform and the motion platform, the stationary platform is provided with three planar curved rails, each planar curved rail is connected to the motion platform through a branched chain, and each branched chain includes a slider, two link bars I arranged in parallel, two link bars II arranged in parallel, and link bar III, select one revolute joint I in each branched chain to form three revolute joints I as the main driving joint or three sliders as the driving parts.

Single-layer three-section rail-type planar robot containing a double parallelogram

An apparatus for improving the safety and efficiency of underground mining by issuing intelligent warnings of impending coal or rock dynamic disasters includes at least one coal or rock charge probe adaptable to a coal or rock face and configured to detect charge data generated by coal or rock cracking during a mining process, and a monitoring host electrically connected to the coal or rock charge probe and configured to receive the charge data and issue a warning of an impending coal or rock dynamic disaster when warranted by the charge data. In embodiments, the apparatus includes a plurality of channels, and is non-contacting and/or portable.

Coal or rock dynamic disaster warning apparatus and method

An ultra-high strength maraging stainless steel with nominal composition (in mass) of C&#x2264;0.03%, Cr: 13.0-14.0%, Ni: 5.5-7.0%, Co: 5.5-7.5%, Mo: 3.0-5.0%, Ti: 1.9-2.5%, Si: &#x2264;0.1%, Mn: &#x2264;0.1%, P: &#x2264;0.01%, S: &#x2264;0.01%, and Fe: balance. The developed ultra-high strength maraging stainless steel combines ultra-high strength (with &#x3c3;b&#x2265;2000 MPa, &#x3c3;0.2&#x2265;1700 MPa, &#x3b4;&#x2265;8% and &#x3c8;&#x2265;40%), high toughness (KIC&#x2265;83 MPa&#xb7;m&#xbd;) and superior salt-water corrosion resistance (with pitting potential Epit&#x2265;0.15 (vs SCE)). Therefore, this steel is suitable to make structural parts that are used in harsh corrosive environments like marine environment containing chloride ions, etc.

A method for fault location to multi-terminal traveling wave in a direct current distribution line, which belongs to the field of power line fault ranging and location technology. The method includes a main site and a plurality of acquisition points installed into the distribution line and includes steps as follows. Step: collecting and uploading a traveling wave signal by each of the acquisition points after a fault occurs in the line; step: generating a fault record set; step: computing the shortest paths from a central site to other sites and their lengths; step: using expanded two-terminal traveling wave ranging principle for pairing computation; step: converting positions of possible disturbance points into possible disturbance occurrence time points; step: extrapolating from equal path lengths of the possible disturbance points to obtain disturbance time data; and step: determining a final disturbance point.

Method for fault location to multi-terminal traveling wave in direct current distribution line

A method for fault location to single-terminal traveling wave includes steps as follows. Step (a): recording a waveform of a traveling wave signal of disturbance by a traveling wave device when a line disturbance occurs. Step (b): performing a phase mode transformation on the waveform recorded by the step (a), so as to obtain components of line mode and zero mode of a fault initial traveling wave, and performing a wavelet transform to decompose the components of the line mode to obtain singularities in the waveform of the traveling wave. Step (c): calculating a wavefront slope k of the components of the line mode of the fault initial traveling wave. Step (d): computing a preliminary fault distance D according to the slope k computed in the step (c). Step (e): confirming a fault point according to the preliminary fault distance and wavelet singularities of the components of the line mode. Step (f): end.

Method for fault location to single-terminal traveling wave

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Shenyang, China

Wei Wang