Search

Aiming at characteristics of electrical explosion-proof and large wireless transmission attenuation in underground coal mine, 5G technology and its application scope were analyzed.Mine-used 5G should adopt intrinsically safe explosion-proof. Mine-used 5G for control should have strong anti-interference ability. Mine-used 5G should be used for remote control of coal mining face and tunneling face. Mine-used 5G should be used for ground remote control of unmanned vehicle in underground coal mine. Mine-used 5G that has not been developed for characteristics of mine mobile communication is less cost-effective than mine-used WiFi mobile communication system. It is strictly forbidden to replace mine-used wired dispatching communication system with mine-used 5G mobile communication system. Mine-used 5G that is not developed for coal mine safety monitoring characteristics cannot replace coal mine safety monitoring system. Positioning accuracy of mine-used 5G that has not been developed for precise positioning characteristics of mine moving target is lower than that of mine-used UWB precision positioning system. Transmission rate of mine-used 5G in frequency range of 450-6 000 MHz is lower than that of mine-used WiFi6. Reliability of mine-used 5G that is not developed for monitoring characteristics of fixed equipment in underground coal mine is lower than that of mine-used wired monitoring system. It is urgent to research and develop mine-used 5G based on characteristics of safe production in coal mine, not just for explosion-proof transformation of existing ground 5G products.

In view of problems that current simulation research on motion of three machines on fully mechanized mining face could not display single-machine motion state in detail, and linkage process of a single unit was rarely involved, geometric model of three machines were established using virtual machine technology. On the basis of attitude analysis, under the Unity3D platform and through script component,object-oriented programming ideas was applied, motions of single machine were restored including rocker arm lifting,coal cutting action of shearer, descending column, moving frame, pushing of conveyer, and bending movement of scraper conveyor. The test results show that the established model can clearly and completely show the structure and operation principle of the three machines and the motion of single machine.

Copyright of Journal of Mine Automation is the property of Industry & Mine Automation Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In view of requirement of high efficient mining for unmanned fully-mechanized coal mining face, an automatic mining technology scheme of unmanned fully-mechanized coal mining face was proposed which takes cooperative control technology as core, automatic control technology of shearer, hydraulic support and scraper conveyor as basis, self-advancing control technology of coal conveying equipment as support, and video monitoring and data platform display as extension. Specific implementation of the scheme was introduced in combination with field condition of 1001 coal face of Huangling No.1 Mine. The application results show that the scheme can automatically finish production processes of coal cutting, support advancing, scraper conveyor pushing and roof supporting, and realizes high efficient with less people.

Copyright of Journal of Mine Automation is the property of Industry & Mine Automation Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Technology status of automatic fully-mechanized coal mining face in China was introduced, and fully-mechanized coal mining equipments were classified into production equipment, auxiliary equipment and monitoring and control system. In view of current confused naming situation of coal mining face in the industry, name of 'automatic fully-mechanized coal mining face' was considered more appropriate. Technology of the automatic fully-mechanized coal mining face could be divided into four grades, namely partly automatic fully-mechanized coal mining face, semi-automatic fully-mechanized coal mining face, completely automatic fully-mechanized coal mining face and intelligently automatic fully-mechanized coal mining face, whose specific characteristics were given. Development approach of the automatic fully-mechanized coal mining face was introduced, and a view was pointed out it tally with actual situation better that considering automatic fully-mechanized coal mining face as a large machine which can automatically work, cut coal, support, load coal and transport coal.

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Unmanned or lee-manned fully-mechanized coal mining face is a core topic about coal mine safety. A view was pointed out that automatic coal mining should be pondered on from the whole fully-mechanized system, and fully-mechanized equipments should be classified into production equipment, auxiliary equipment and control center of coal mining face, whose control requirements were proposed. The composition of the control center of coal mining face and main functions of each part were emphatically described. The composition, system structure and characteristics of unmanned fully-mechanized coal mining face were introduced. It was believed that the unmanned fully-mechanized coal mining face could realize four-level monitoring and three-level control.

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on an idea of an unmanned coal mining technology, the paper introduced the orientation of an intelligent mining development in underground coal mine and provided the definition and technical connotation of the intelligent mining and excavation in coal mine. The paper reviewed the development and present status of the intelligent coal mining equipment and technology in China and pointed out that China would have an opportunity to take a commanding point of the intelligent mining and excavation equipment and technology. The paper stated the three perceptive and three adaptive technical architecture and had an outlook on breakthrough directions of the key technology related to the high efficient and adaptive coal and rock cutting technology, adaptive control technology of the hydraulic powered support, adaptive regulation technology of power transmission, intelligent recognition technology of coal-rock interface, intelligent diagnosis technology of the coal mining equipment and adaptive cruise control technology of the coal mining equipment. [ABSTRACT FROM AUTHOR]