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TANDEM and GMAW Twin Wire Welding of Q690 Steel Used in hydraulic support

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Journal of Iron and Steel Research International 2012年第5期19卷 79-85页

作者： FANG Chen-fu MENG Xiao-hui HU Qing-xian WANG Feng-jiang REN He WANG Hai-song GUO Yu MAO Ming School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina Nanjing Pengli Science and Technology Co Ltd Nanjing 211135JiangsuChina Shanxi Pingyang Industry Machinery Co Ltd Pingyang 043003ShanxiChina

Compared with using semi-automatic gas shielded arc welding, using automatic TANDEM twin wire welding and twin wire gas metal arc welding （GMAW） to weld Q690 steel, a low-alloy high-strength structural steel used in the hydraulic support in the fully-mechanized mining face, the welding speed, deposition rate, production environment and welding quality can be obviously improved. Compared with GMAW twin wire welding, a refined micro- structure in the weld and heat-affected zone （HAZ）, narrow HAZ and improved joint strength were achieved with TANDEM on Q690. Also, due to the push-pull pulsed way in TANDEM welding, the droplet transfer, distribution on heat flow and interaction between two arcs were completely different from those in GMAW twin wire system. The heat input of TANDEM is only about 76.6% of GMAW, and correspondingly, the welding speed and welding seam can be obviously improved. The complete oscillation caused by TANDEM pulsed current occurred in the welding pool, which refined the grains in the microstructure. The results show that TANDEM twin wire welding is very suitable in the welding of Q690 used in the hydraulic support.

关键词： Q690 steel TANDEM twin wire welding GMAW twin wire welding performance analysis hydraulic support

VIRTUAL DESIGN OF A NEW TYPE OF hydraulic support

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Chinese Journal of Mechanical Engineering 2002年第3期15卷 275-278页

作者： Dong Zhifeng Chang Hong Wang Shoufeng Zheng Yi Yang YanxiuDepartment of Mechanical and Electronic Engineering, China University of Mining and Technology,Beijing 100083, China （北京）中国矿业大学北京 100083

Using virtual reality to design a new type of hydraulic support is *** is how to make use of the virtual design to develop coal mining machine in practice. Theadvantages of virtual design are studied and the simple virtual reality system is built. The 3Dparts and elements of hydraulic support are modeled with parametric design in CAD software, thenexported to VR environment, in which the virtual hydraulic support is assembled, operated andtested. With the method, the errors and faults of design can be fined easily, many improvements aremade and the new hydraulic support is developed successfully.

关键词： Virtual reality Virtual design hydraulic support

STUDY OF A FAULT DIAGNOSIS EXPERT SYSTEM FOR SYNTHETIC MINING SYSTEM hydraulic support

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Journal of Coal Science & Engineering(China) 2000年第1期6卷 72-75页

作者：韩以伦 Taiyuan University of Technology Taiyuan030024

Fault diagnosis expert system for hydraulic support is *** system is achieved by Turbo prolong Language, it summaries the experience of the domain expert and sets up a fault tree, knowledge base is developed by a productive *** to the feature of diagnosis, the system selects forward non determination inferring and limited depth first search *** can accomplish expert diagnosis of more than 50 kinds faults in hydraulic support.

关键词： hydraulic support fault diagnosis expert system

Mechanisms and Kinematics of hydraulic support for Top-Coal Caving

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Journal of China University of Mining and Technology 2001年第2期11卷 155-158页

作者：董志峰王寿峰常宏吴建 Department of Mechanical and Electronic Engineering CUMT Beijing 100083 P. R. China Department of Resource Exploitation Engineering CUMT Beijing 100083 P. R. China

The structure and characteristic of new type of hydraulic support for top coal caving were discussed. The mechanism and kinematics of the hydraulic support were analyzed. The formulas were deduced to calculate the velocity and acceleration of top beam, shield beam, front and back legs, which give the solution to the design and research for hydraulic support.

关键词： top coal caving hydraulic support mechanisms kinematics

Mechanisms and Virtual Design of a New Type of Top-Coal Caving hydraulic support

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Mechanisms and Virtual Design of a New Type of Top-Coal Cavi...

Longwall face roof disaster prediction algorithm based on data model driving

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作者： Zhifeng Dong Yijian Tang Jinhua Liu Hongxia Wu YouqiangZhou Department of Mechanical and Electronic Engineering China University of Mining and Technology Beijing 100083 China Jian Wu Department of Resource Exploitation Engineering China University of Mining and Technology Beijing 100083 China

＜正＞A new type of top-coal caving hydraulic support and its characteristic are discussed in this paper. The multi-freedom mechanism of the support is simplified as a planar mechanism to get a direct analytic solution. The kinematic analysis of the support are made to present the equations which indicate the parametric relationship of geometry and motion of the components. The key formula deduced here can be used not only to virtual reality but also to practical application of the hydraulic supports. In order that the top beam of support can move horizontally, which makes the support work perfectly and effectively, the front and back legs must move at certain velocity coordinately. With the method of virtual design, the errors and faults are fined easily, many improvements are made in time, which makes the new hydraulic support developed successfully.

关键词： hydraulic support Top-coal caving virtual design Mechanisms Kinematics

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International Journal of Coal Science & Technology 2022年第1期9卷 151-166页

作者： Yihui Pang Hongbo Wang Jinfu Lou Hailong Chai Coal Mining Research Institute Co. Ltd of CCTEGBeijing 100013China Coal Mining and Designing Department Tiandi Science&Technology Co.LtdBeijing 100013China Coal Mining Branch China Coal Research InstituteBeijing 100013China School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China

hydraulic support is the primary equipment used for surrounding rock control at fully mechanized mining *** load,location,and attitude of the hydraulic support are important sets of basis data to predict roof *** paper summarized and analyzed the status of coal mine safety accidents and the primary influencing factors of roof *** work also proposed monitoring characteristic parameters of roof disasters based on support posture-load changes,such as the support location and support *** data feature decomposition method of the additive model was used with the monitoring load data of the hydraulic support in the Yanghuopan coal mine to effectively extract the trend,cycle period,and residuals,which provided the period weighting characteristics of the longwall *** autoregressive,long-short term memory,and support vector regression algorithms were used to model and analyze the monitoring data to realize single-point *** seasonal autoregressive integrated moving average(SARIMA)and autoregressive integrated moving average(ARIMA)models were adopted to predict the support cycle load of the hydraulic *** SARIMA model is shown to be better than the ARIMA model for load predictions in one support cycle,but the prediction effect of these two algorithms over a fracture cycle is ***,we proposed a hydraulic support load prediction method based on multiple data cutting and a hydraulic support load template *** constructed technical framework of the roof disaster intelligent prediction platform is based on this method to perform predictions and early warnings of roof disasters based on the load and posture monitoring information from the hydraulic support.

关键词： Data model Roof disaster hydraulic support Characteristic parameter Intelligent prediction

Virtual straightening of scraper conveyor based on the position and attitude solution of industrial robot model

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International Journal of Coal Science & Technology 2021年第5期8卷 1149-1170页

作者： Suhua Li Jiacheng Xie Fang Ren Xin Zhang Xuewen Wang Binbin Wang Shanxi Key Laboratory of Fully Mechanized Coal Mining Equipment College of Mechanical and Vehicle EngineeringTaiyuan University of TechnologyTaiyuan 030024China

The movement of the floating connecting mechanism between a hydraulic support and scraper conveyor is space movement;thus,when the hydraulic support pushes the scraper conveyor,there is an error between the actual distance of the scraper conveyor and the theoretical moving *** a result,the scraper conveyor cannot obtain the straightness ***,the movement law of the floating connecting mechanism between the hydraulic support and scraper conveyor is analyzed and programmed into the Unity3D to realize accurate pushing of the scraper conveyor via hydraulic *** Coal Seam?Equipment Joint Virtual Straightening System is established,and a straightening method based on the motion law of a floating connection is proposed as the default method of the *** addition,a straightening simulation of the scraper conveyor was performed on a complex coal seam floor,the results demonstrate that the average straightening error of the scraper conveyor is within 2-8 mm,and is in direct proportion to the fluctuation of the coal seam floor in the strike of the seam with high accuracy,the straightness of scraper conveyor is more affected by the subsidence terrain during straightening than by the bulge *** some conclusions are verified by *** on the verification of the relevant conclusions,a comparison and analysis of Longwall Automation Steering Committee(LASC)straightening technology and default straightening method in the simulation system shows that the straightness accuracy of LASC straightening technology under complex floor conditions is slightly less than that of the default straightening method in the proposed system.

关键词： Virtual reality Scraper conveyor hydraulic support Posture solution Straightness control

Surrounding rock control theory and longwall mining technology innovation

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International Journal of Coal Science & Technology 2017年第4期4卷 301-309页

作者： Guofa Wang Yihui Pang Coal Mining and Design Branch China Coal ResearchInstitute Beijing 100013 China

To accommodate surrounding rock structure stability control problem in underground mining, we study the coupling effect principle between hydraulic support and surrounding rock, and develop a series of longwall mining technology and equipment, which solves four common technical problems that significantly undermine coal mining safety, efficiency, and high recovery and extraction rates. Based on the coupling characteristic between mining-induced stress field and supporting stress field of hydraulic support, we identify six controllable factors in the application of hydraulic support to surrounding rock, and further reveal the relationship between hydraulic support and surrounding rock in terms of the strength, the stiffness, and the stability coupling. Our findings provide a plausible solution to the longwall mining technical problem with 6-8 m mining height. By analyzing the dynamic disequilibrium characteristics between hydraulic support and surrounding rock, we propose the intelligent top coal caving control method and the high-coal-recovery-rate tech- nology for fully mechanized caving faces. With the invention of this technology, China is likely to lead the world in terms of the fully mechanized top coal caving mining technology. We are also the first to employ the intelligent coupling technology between hydraulic support and surrounding rock, and automated mining mode, and supporting system coop- erative control with automatic organization. We develop the comprehensive multi-index intelligence adjusting height decision-making mechanism and three-dimensional navigation automatic adjusting straightness technology based on shearer cutting height memory association, cutting power parameters, vibration, and video information, leading to the first set of intelligent longwall mining technology and equipment for thin seam. Our innovation makes a solid contribution to the revolution of intelligence mining technology. With the innovative use of three-dimensional coupling

关键词： Surrounding rock control hydraulic support Thick coal seam Thin coal seam Steep dipping seam

Development of 30Cr06A,a high strength cast steel and its welding ability

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Journal of China University of Mining and Technology 2008年第2期18卷 296-299页

作者： GAO You-jin School of Hydropower and Digitalization Engineering Huazhong University of Soience and Technology Wuhan Hubei 430074 China Zhengzhou Coal Mining Machinery Co. Ltd Zhengzhou Henan 450001 China

High performance hydraulic supports have a high requirement in strength,toughness and welding ability of socket mate- *** this problem,we analyzed the properties of the high strength socket material 30Cr06,used in high performance hy- draulic supports both at home and abroad and developed a new kind of high strength cast steel 30Cr06A,by making use of an or- thogonal experiment,which provided the design conditions for its optimal *** result shows that the strength and toughness of the newly developed high strength cast steel 30Cr06A is much better than that of *** calculations,mechanical property tests and hardness distribution tests of welded joints were carried out for a study of the welding ability of the new material,which is proved to be very ***,this 30Cr06A material has been successfully used in the socket of high performance hydraulic support.

关键词： hydraulic support socket material 30Cr06A strength toughness welding ability