China University of Mining and Technology

Chinese Academy of Sciences

Beihang University

Junjie Wang

Qiwei Wang

Wenxiu Zhu

Yuan Zhou

Fei Wang

Wenshuai Song

Liqiang Ma

Hao Yue

Xiaomin Yu

Zhiyuan Jin

Peng Dl

Lishuang Feng

Yinzhou Zhi

Hongchen Jiao

Jinghui Cai

Jiachen Wang

Yinzhong Zhang

Fengqi Liu

Jiaxue Wang

Maoping Zhao

Shengli Yang

Yanyao Ma

Jianbo Cao

The present invention provides an experimental platform for simulating a coal rock disaster of a coal mine extraction, including a base device, a coal simulation device, an immediate roof simulation device, a hydraulic support and a removable impact device. The coal simulation device is fixedly disposed on the base device; the hydraulic support is fixed on the base device and is located at one side of the coal simulation device; the immediate roof simulation device is disposed above the coal simulation device and the hydraulic support; the removable impact device is disposed above the immediate roof simulation device; the immediate roof simulation device is a rectangular frame; the rectangular frame is configured to pave a bulk simulation material and an immediate roof simulation material sequentially from the bottom up; and the removable impact device can impact the immediate roof simulation material and the bulk simulation material.

Experimental platform and experimental method for simulating coal rock disaster of coal mine stope

A transportation main roadway and stope branch roadways are arranged by adopting a wangeviry coal mining method. A plurality of stope branch roadways are divided into multiple mining stages, based on which the stope branch roadways are skip-mined; and coal pillars are not reserved among the stope branch roadways. The transportation main roadway is a main transportation channel, and the stope branch roadways are coal mining roadways. All the stope branch roadways are sequentially stoped in a skip-mining manner according to the designed mining sequence and are sequentially and timely filled. The coal never stoped or the filled stope branch roadways is/are used as supports for controlling roofs at the two sides of the stope branch roadways, and the stope branch roadways are sequentially stoped according to a plurality of mining stages, and finally the coal pillar-free mining is realized.

Skip-mining type wangeviry stope branch roadway filling and coal mining method

A transmissive photonic crystal fiber ring resonator employing single optical beam-splitter comprises: a first fiber-optic collimator, a second fiber-optic collimator, a first photonic crystal fiber collimator, a second photonic crystal fiber collimator, an optical beam-splitter, and a fixture. The first fiber-optic collimator, the second fiber-optic collimator, the first photonic crystal fiber collimator, the second photonic crystal fiber collimator, and the optical beam-splitter are fixed on the fixture; the fiber pigtails of the first fiber-optic collimator and the second fiber-optic collimator are the input/output ports; the fiber pigtails of the first photonic crystal fiber collimator and the second photonic crystal fiber collimator are connected. The number of components of the photonic crystal fiber ring resonator is reduced by half: only one optical beam-splitter and two photonic crystal fiber collimators besides two fiber-optic collimators; therefore, the resonator structure can be simplified and the size can be reduced.

Transmissive photonic crystal fiber ring resonator employing single optical beam-splitter

A multi-bypass pulse tube refrigerator comprising a pressure wave generator, a regenerator, a heat exchanger of cold ends (cold finger), a pulse tube, an orifice means and a reservoir volume, connecting in serial. Matrix material made of material of high heat capacity is packed in the regenerator. Rectifying means are arranged at the ends of the pulse tube. The outlet of the pressure wave generator is connected with the hot end of the regenerator. The connection between the cold ends of the regenerator and the pulse tube forms the heat exchanger of cold ends. The reservoir volume is connected with the hot end of the pulse tube through the orifice means. Resistance means are properly arranged in the pulse tube, so as to for gas to pass through the pulse tube uniformly and smoothly. At least one bypass with a throttling means is provided to connect the regenerator and the pulse tube. The refrigerator provided by the invention has a lower refrigeration temperature, high refrigeration capacity and improved refrigeration efficiency.

Multi-bypass pulse tube refrigerator

Growing community of inventors

Beijing, China

Junjie Wang