The Experts below are selected from a list of 636 Experts worldwide ranked by ideXlab platform
Yuxing Peng - One of the best experts on this subject based on the ideXlab platform.
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influence of braking pressure on tribological performance of non asbestos Brake Shoe for mine hoister during emergency braking
2012Co-Authors: Minming Tong, Yuxing PengAbstract:Purpose – The purpose of this paper is to describe some tribological experiments which were executed to find the influence of braking pressure on tribological performance of non‐asbestos Brake Shoe used in mine hoister during its emergency braking.Design/methodology/approach – The WSM‐3 non‐asbestos Brake Shoe, which has been widely used in mine hoister, was selected as experimental material. Some tribological experiments of the Brake Shoe sliding on 16Mn steel were investigated on the X‐DM friction tester by simulating of emergency braking conditions of mine hoister. Three kinds of tribological indexes: friction coefficient, stability coefficient of friction coefficient, and wear rate were considered to score the tribological performance and the morphology of worn surfaces were observed through the S‐3000N scanning electron microscopy (SEM) to explore the tribological mechanisms.Findings – It was found first, that the instant friction coefficient is not constant during emergency braking. After a short cl...
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three dimensional transient temperature field of Brake Shoe during hoist s emergency braking
2009Co-Authors: Zhencai Zhu, Yuxing Peng, Zhiyuan Shi, Guoan ChenAbstract:Abstract In order to exactly master the change rules of Brake Shoe’s temperature field during hoist’s emergency braking, the theoretical model of three-dimensional (3-D) transient temperature field was established according to the theory of heat conduction, the law of energy transformation and distribution, and the operating condition of mining hoist’s emergency braking. An analytic solution of temperature field was deduced by adopting integral-transform method. Furthermore, simulation experiments of temperature field were carried out and the variation regularities of temperature field and internal temperature gradient were obtained. At the same time, by simulating hoist’s emergency braking condition, the experiments for measuring Brake Shoe’s temperature were also conducted. It is found, by comparing simulation results with experimental data, that the 3-D transient temperature field model of Brake Shoe is valid and practical, and analytic solution solved by integral-transform method is correct.
Guoan Chen - One of the best experts on this subject based on the ideXlab platform.
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frictional catastrophe behaviors and mechanisms of Brake Shoe for mine hoisters during repetitious emergency brakings
2013Co-Authors: Zhencai Zhu, Jiusheng Bao, Yan Yin, Guoan ChenAbstract:Purpose – In order to improve the braking safety of mine hoisters, this paper aims to focus on the continuous repetitious emergency braking conditions to investigate an abnormal frictional phenomena called “Frictional catastrophe (FC)” and its mechanisms.Design/methodology/approach – The non‐asbestos Brake Shoe of a mine hoister was selected as frictional material and its paring material is 16Mn steel. The tribological properties of the Brake Shoe were tested on the pad‐on‐disc friction tester by the simulation of continuous emergency braking conditions. The thermal analysis experiments, the temperature field simulations and the SEM analysis of the Brake Shoe were accomplished to reveal the mechanisms of the FC.Findings – It was found that the friction coefficient of the Brake Shoe sometimes falls suddenly during braking. This abnormal frictional phenomena is called “Frictional catastrophe (FC)”. It is considered that the friction heat, which is accumulated rapidly by the braking on the surface of the bra...
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three dimensional transient temperature field of Brake Shoe during hoist s emergency braking
2009Co-Authors: Zhencai Zhu, Yuxing Peng, Zhiyuan Shi, Guoan ChenAbstract:Abstract In order to exactly master the change rules of Brake Shoe’s temperature field during hoist’s emergency braking, the theoretical model of three-dimensional (3-D) transient temperature field was established according to the theory of heat conduction, the law of energy transformation and distribution, and the operating condition of mining hoist’s emergency braking. An analytic solution of temperature field was deduced by adopting integral-transform method. Furthermore, simulation experiments of temperature field were carried out and the variation regularities of temperature field and internal temperature gradient were obtained. At the same time, by simulating hoist’s emergency braking condition, the experiments for measuring Brake Shoe’s temperature were also conducted. It is found, by comparing simulation results with experimental data, that the 3-D transient temperature field model of Brake Shoe is valid and practical, and analytic solution solved by integral-transform method is correct.
Zhencai Zhu - One of the best experts on this subject based on the ideXlab platform.
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preparation of high friction Brake Shoe material and its tribological behaviors during emergency braking in ultra deep coal mine hoist
2020Co-Authors: Dagang Wang, Zhencai Zhu, Jikun Yin, Dekun Zhang, Dahua Liu, Hewei Liu, Fuqiang SunAbstract:Abstract The ultra-deep coal mine exhibits the larger speed (>18 m/s) and terminal load (≥240 t/cycle) during hoisting as compared to the ordinary deep coal mine. The larger coefficient of friction and Brake specific pressure between Brake Shoe and Brake disc are required to provide the larger friction force and Brake torque in order to realize the safe and reliable braking. Therefore, the preparation of high friction Brake Shoe material and its tribological behaviors during emergency braking in ultra-deep coal mine hoist were investigated in this study. The tribo-Brake test rig of Brake Shoe material with the maximum speed 20 m/s and maximum specific pressure of 2.0 MPa was developed based on the similarity principle. Mechanical properties and conventional tribological behaviors (coefficient of friction, wear rate, temperature rise rate, surface morphology and composition) of resin based Brake Shoe materials of different formulas were investigated to obtain the optimal formula of high friction Brake Shoe material employing the uniform experimental design method. Conventional tribological properties of self-made and commonly used WSM-3 Brake Shoe materials were compared. Effects of initial braking speed and Brake specific pressure on tribological behaviors of high friction Brake Shoe material during emergency braking with the large speed and Brake specific pressure were explored. The results show that the optimal formula of Brake Shoe material consists of the optimal basic formula (phenolic resin 9.8%, NBR 3.8%, vermiculite powder 4.9%, conductive carbon black 2.6%, ceramic fiber 10.6%, graphite 3.8%, sepiolite 8.7%, wollastonite 19.2%, barium sulfate 10.6%, diatomite 7.9%, stearic acid 1.5%, zircon 4.5%, mica 3.8%, kaolin 3%, antimony trioxide 3%, and lead oxide 2.3%), graphene 4%, carbon fiber 2% and glass fiber 4%. As compared to WSM-3 Brake Shoe materials, the high friction Brake Shoe material presents the higher coefficient of friction and the medium volume wear rate. During emergency braking, the average coefficient of friction at the stabilized stage shows an increase at first and then a decrease with increasing initial braking speed, and a decrease with increasing Brake specific pressure. Increases of initial braking speed and Brake specific pressure cause increases in the temperature and temperature rise amplitude of friction disc surface.
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frictional catastrophe behaviors and mechanisms of Brake Shoe for mine hoisters during repetitious emergency brakings
2013Co-Authors: Zhencai Zhu, Jiusheng Bao, Yan Yin, Guoan ChenAbstract:Purpose – In order to improve the braking safety of mine hoisters, this paper aims to focus on the continuous repetitious emergency braking conditions to investigate an abnormal frictional phenomena called “Frictional catastrophe (FC)” and its mechanisms.Design/methodology/approach – The non‐asbestos Brake Shoe of a mine hoister was selected as frictional material and its paring material is 16Mn steel. The tribological properties of the Brake Shoe were tested on the pad‐on‐disc friction tester by the simulation of continuous emergency braking conditions. The thermal analysis experiments, the temperature field simulations and the SEM analysis of the Brake Shoe were accomplished to reveal the mechanisms of the FC.Findings – It was found that the friction coefficient of the Brake Shoe sometimes falls suddenly during braking. This abnormal frictional phenomena is called “Frictional catastrophe (FC)”. It is considered that the friction heat, which is accumulated rapidly by the braking on the surface of the bra...
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three dimensional transient temperature field of Brake Shoe during hoist s emergency braking
2009Co-Authors: Zhencai Zhu, Yuxing Peng, Zhiyuan Shi, Guoan ChenAbstract:Abstract In order to exactly master the change rules of Brake Shoe’s temperature field during hoist’s emergency braking, the theoretical model of three-dimensional (3-D) transient temperature field was established according to the theory of heat conduction, the law of energy transformation and distribution, and the operating condition of mining hoist’s emergency braking. An analytic solution of temperature field was deduced by adopting integral-transform method. Furthermore, simulation experiments of temperature field were carried out and the variation regularities of temperature field and internal temperature gradient were obtained. At the same time, by simulating hoist’s emergency braking condition, the experiments for measuring Brake Shoe’s temperature were also conducted. It is found, by comparing simulation results with experimental data, that the 3-D transient temperature field model of Brake Shoe is valid and practical, and analytic solution solved by integral-transform method is correct.
Huo Mengshen - One of the best experts on this subject based on the ideXlab platform.
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friction material for Brake Shoe of heavy axle load wagon and preparation method of friction material
2014Co-Authors: Zhang Xufeng, Zhou Jianhua, Huo MengshenAbstract:The invention discloses a friction material for a Brake-Shoe of a heavy axle-load wagon. The friction material is prepared from the following components in percentage by mass: 6-12 percent of nitrile rubber, 1-4 percent of butadiene styrene rubber, 3-8 percent of A-stage phenolic resin, 0.4-1 percent of insoluble sulfur, 0.1-0.6 percent of an accelerant, 0.1-0.6 part of a curing agent, 2-6 percent of carbon black, 8-18 percent of barite, 1-4 percent of kyanite, 17-40 percent of hybrid fibers, 7-14 percent of magnesium oxide, 2-6 percent of petroleum coke, 2-8 percent of calcium sulfate crystal whiskers, 1-4 percent of molybdenum disulfide, 1-5 percent of crystalline flake graphite, 1-4 percent of artificial graphite, 1-4 percent of mica iron oxide and 1-3 percent of antimony sulfide. The friction material can satisfy the friction performance and mechanical property required by the Brake-Shoe of the heavy axle-load wagon and can meet the high speed operating requirement on heavy load of the wagon.
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friction material for Brake Shoe of heavy axle load wagon and preparation method of wagon Brake Shoe
2014Co-Authors: Zhou Jianhua, Zhang Xufeng, Huo MengshenAbstract:The invention discloses a friction material for Brake-Shoe of heavy axle-load wagon, and a preparation method of a Brake-Shoe of heavy axle-load wagon. The preparation method of the friction material comprises the following steps: preparing raw materials of the friction material according to corresponding weight ratio of each raw material; adding the prepared raw materials into a meshing-type internal mixer to carry out an internal heating treatment and an internal modulating treatment; discharging the processed raw materials, grinding, and finally granulating so as to obtain the friction material. The method can obtain a friction material having a stable friction performance and good wear resistant property; and at the same time the friction material can be used to manufacture braking parts which can meet the application requirements of heavy axle-load wagon.
Jiusheng Bao - One of the best experts on this subject based on the ideXlab platform.
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development of a novel magnetic Brake Shoe for mine hoists based on nano fe3o4 and nd fe b additive
2019Co-Authors: Jiusheng Bao, Yan Yin, Shaodi Zhao, Xingming Xiao, Mark E Tuttle, Tonggang LiuAbstract:Background The Brake is an important safety protection device for mine hoists, in which the performance of the Brake Shoe affects directly the safe operation of the hoist system. In order to solve problems such as high wear rate and unstable friction coefficient of Brake Shoe under high temperature, this paper indicated that adding magnetic powder to the composite material of traditional mine hoist's Brake Shoe will be a creative and effective approach to improve its properties. Methods Based on relevant China patents of the authors, several new formulas of Brake Shoe material were designed in the presence of Nano-Fe3O4 and Nd-Fe-B, and the methods of both preparation and performance testing of the magnetic Brake Shoes were introduced. The experiment of formula design was carried out by uniform prescription design, and the friction coefficient and wear rate of each kind of Brake Shoes made through different formulas were measured. Furthermore, the formula was optimized by application of fuzzy comprehensive evaluation method and analytic hierarchy process. Results Compared with ordinary formulas, the optimized formula is higher totally and changes more steadily as well. Its wear rate is far lower than the national standard. Namely, its comprehensive properties are better. Few relevant patents to the topic have been reviewed and cited. Conclusion This paper proved that it is practically valuable and feasible to improve the properties of hoist Brake Shoes by adding magnetic powder to its composite material.
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frictional catastrophe behaviors and mechanisms of Brake Shoe for mine hoisters during repetitious emergency brakings
2013Co-Authors: Zhencai Zhu, Jiusheng Bao, Yan Yin, Guoan ChenAbstract:Purpose – In order to improve the braking safety of mine hoisters, this paper aims to focus on the continuous repetitious emergency braking conditions to investigate an abnormal frictional phenomena called “Frictional catastrophe (FC)” and its mechanisms.Design/methodology/approach – The non‐asbestos Brake Shoe of a mine hoister was selected as frictional material and its paring material is 16Mn steel. The tribological properties of the Brake Shoe were tested on the pad‐on‐disc friction tester by the simulation of continuous emergency braking conditions. The thermal analysis experiments, the temperature field simulations and the SEM analysis of the Brake Shoe were accomplished to reveal the mechanisms of the FC.Findings – It was found that the friction coefficient of the Brake Shoe sometimes falls suddenly during braking. This abnormal frictional phenomena is called “Frictional catastrophe (FC)”. It is considered that the friction heat, which is accumulated rapidly by the braking on the surface of the bra...