Temperature Field of Disc Brake for Mine Hoist

2011 ◽  
Vol 4 (6) ◽  
pp. 2380-2384 ◽  
Author(s):  
Yuxing Peng ◽  
Zhencai Zhu ◽  
Guoan Chen ◽  
Jiusheng Bao ◽  
Binbin Liu ◽  
...  
Keyword(s):  
Temperature Field ◽  
Disc Brake ◽  
Mine Hoist

Numerical Modeling and Simulation Analysis of Temperature Field of Disc Brake on Trains

2011 ◽  
Vol 199-200 ◽  
pp. 1492-1495 ◽  
Author(s):  
Guo Shun Wang ◽  
Rong Fu ◽  
Liang Zhao
Keyword(s):  
Temperature Field ◽  
Temperature Gradient ◽  
High Speed ◽  
Large Scale ◽  
Working Condition ◽  
Constant Speed ◽  
Brake Disc ◽  
Disc Brake ◽  
Brake Pad ◽  
Finite Element Software

The simulation calculation on the temperature field of the disc brake system on high-speed trains under the working condition of constant speed at 50Km/h is made. A steady-state calculation model is established according to the actual geometric size of a brake disc and a brake pad, and the analog calculation and simulation on the temperature field of the brake disc and the brake pad by using the large-scale nonlinear finite element software ABAQUS are carried out. The distribution rules of the temperature field of the brake disc and the brake pad under the working condition of constant speed are made known. The surface temperature of the brake disc at friction radius is the highest, with a band distribution for temperature. There exists a temperature flex point in the direction of thickness, of which the thickness occupies 15% of that of the brake disc; due to the small volume of the brake pad, the temperature gradient of the whole brake pad is not sharp, and larger temperature gradient occurs only on the contact surface.

scholarly journals Numerical Modeling of Mine Hoist Disc Brake Temperature for Safer Operation

2021 ◽  
Vol 13 (5) ◽  
pp. 2874
Author(s):  
Florin Dumitru Popescu ◽  
Sorin Mihai Radu ◽  
Andrei Andraș ◽  
Ildiko Brînaș
Keyword(s):  
Raw Materials ◽  
Calculation Model ◽  
Scale Model ◽  
Temperature Threshold ◽  
Disc Brake ◽  
Emergency Braking ◽  
Drive Wheel ◽  
Real Material ◽  
Cable Drive ◽  
Mine Hoist

The sustainable exploitation of raw materials, with improved safety and increased productivity, is closely linked to the development of mechanical mining installations. Mine hoists are designed for the transport of material, equipment and personnel between the mine surface and the underground. The mine hoist braking system is of paramount importance in its safe operation. Thus, for both drum and disc brake systems, the temperature of the friction surfaces is important for ensuring efficient braking, as exceeding the temperature threshold causes a decrease in the braking capacity. In this paper we present a numerical calculation model for the temperature of the braking disc of a mine hoist in the case of emergency braking. A real-scale model was built, based on the cable drive wheel and disc brake system of a hoisting machine used in Romania. Real material characteristics were imposed for the brake discs, the cable drive wheel and the brake pads. The simulation was performed for decelerations of 3, 3.5, 4 and 4.5 m/s2. The analysis shows that regardless of the acceleration and time simulated, the disc temperature reaches its maximum after 1.35 s of emergency braking. This value does not exceed the 327 °C limit where, according to previous studies, the braking power starts to fade. It means that the emergency braking is safe for the acceleration and masses under consideration, in the case of the studied mine hoist.

scholarly journals Dynamic brake characteristics of disc brake during emergency braking of the kilometer deep coal mine hoist

2020 ◽  
Vol 12 (5) ◽  
pp. 168781402091809
Author(s):  
Dagang Wang ◽  
Ruixin Wang ◽  
Jun Zhang
Keyword(s):  
Effective Mass ◽  
Coal Mine ◽  
Equivalent Stress ◽  
Brake Disc ◽  
Disc Brake ◽  
Brake Shoe ◽  
Brake Torque ◽  
Emergency Braking ◽  
Deep Coal Mine ◽  
Mine Hoist

Dynamic brake characteristics of disc brake during emergency braking of the kilometer deep coal mine hoist were investigated in the present study. The theoretical model of dynamic brake torque of disc brake during emergency braking was given to explore dynamic brake torque properties of disc brake. The three-dimensional thermo-mechanical coupled finite element model of brake disc–brake shoe was established to explore thermo-mechanical characteristics of disc brake during emergency braking. Effects of effective mass, hoisting acceleration and deceleration, and maximum hoisting speed on dynamic brake torques, equivalent von Mises stress, and temperature fields of disc brake during emergency braking were presented. The results show that the evolutions of brake torque, equivalent stress, and temperature of disc brake present fluctuating characteristics. The dynamic brake torque shows the largest change amplitude during emergency braking in the hoisting stage of constant speed. The largest equivalent stress and temperature are both located near the third brake shoe along the rotational direction at each side. An increase in effective mass causes overall decreases in the peak values of brake torque, equivalent stress, and temperature during emergency braking. Increases in hoisting acceleration/deceleration and maximum hoisting speed cause the increases in the maximum equivalent stress and temperature during emergency braking as compared to the slight decrease in the maximum brake torque.

Simulation Study of Temperature Field and Stress Field of Disc Brake Based on Direct Coupling Method

2009 ◽  
Vol 628-629 ◽  
pp. 287-292 ◽  
Author(s):  
Xun Yang ◽  
Ji Xin Wang ◽  
J.C. Fan
Keyword(s):  
Temperature Field ◽  
Stress Field ◽  
Material Selection ◽  
Three Dimensional ◽  
Element Model ◽  
Direct Coupling ◽  
Coupling Method ◽  
Disc Brake ◽  
Emergency Braking ◽  
Sequential Coupling

In the process of automobile braking, the interaction between the temperature and the dynamic stress of disc brake is a very complex work. In order to simulate this problem accurately, a three-dimensional finite element model was built. Meanwhile the displacement and thermal boundary conditions for solution were determined, in which the coefficient of convection varies with the transient changing of temperature and time. The distributions of stress field and temperature field of the rotor and pads in an emergency braking were analyzed by the direct coupling method. The results of analysis prove that the thermal-structural direct coupling method can simulate the interaction between the stress field and the temperature field more exactly than the axisymmetric method and sequential coupling method do. The changing of stress field is mainly influenced by the temperature field. The results extracted from coupled simulation can give references for the material selection and structural designs in the development of disc brake.

The Design of Disc Brake for Mine Hoist in Civil Engineering

2012 ◽  
Vol 568 ◽  
pp. 212-215 ◽  
Author(s):  
Hai Tao Zhang ◽  
Ying Jun Dai ◽  
Yu Jing Jia ◽  
Guang Zhen Cheng
Keyword(s):  
Salt Spray ◽  
Outer Cylinder ◽  
Positive Pressure ◽  
Brake Disc ◽  
Disc Brake ◽  
Brake Pads ◽  
Disc Brakes ◽  
Cylinder Piston ◽  
Set Up ◽  
Mine Hoist

This article will describe the research status and the features of control system of the disc brakes of mine hoist. The disc brakes consist of body, outer cylinder, cylinder, piston, ring, disc springs, plunger, gate disk and other components. The disc brakes use the pre-load of disc springs to force the piston to move towards the brake disc, push the brake pads out, then the brake pads and drum brake disc contact and resulting in positive pressure, then the formation of friction produce a braking torque. When the brake system loose pads, the cylinder is filled with the pressure oil, which make the piston compresses the disc springs, and promote the brake pads to move back and then left brake disc, remove the braking force. The hydraulic circuit of the braking system chooses two-way parallel oil and four oil cylinder brake. A slip road set up a one-way throttle, making the slip road brake slightly delayed, which will achieve two stage braking and make work more stable. This disc brake is normally closed, which means when the hoist does not work, the brake is in the state of braking to prevent the occurrence of accidents. This brake is safe, reliable and sensitive in action. The materials of brake pads is rigid asbestos plastic, which have stable friction coefficient, good wear resistance, is not sensitive to the aqueous medium and salt spray,it has flexible installation location, and it is easy to use, adjust and maintain.

Wet multi-disc friction components heat dissipation capability and optimal oil supply under continuous braking condition

2014 ◽  
Vol 66 (6) ◽  
pp. 653-661 ◽  
Author(s):  
Yanzhong Wang ◽  
Bin Wei
Keyword(s):  
Temperature Field ◽  
Heat Dissipation ◽  
Transmission Efficiency ◽  
Disc Brake ◽  
Content Type ◽  
Rotating Speed ◽  
Oil Supply ◽  
Oil Flow ◽  
Complex Boundary Condition ◽  
Complex Boundary

Purpose – The purpose of this study is to investigate wet multi-disc brake temperature field and optimal oil supply under continuous braking condition. The oil supply of wet multi-disc brake has a direct impact on the drivability and fuel economy for tracked vehicles. Too small flow will result in the higher temperature and failure of brake while excessive one will lead to slow engagement increasing disengaged torque and the transmission efficiency could decline notably. The optimal oil supply and brake temperature field were obtained in this research. Design/methodology/approach – This article investigated on the heat dissipation capability and optimal oil supply of the brake by the means of CFX model. The working condition was continuous braking and the lubricating and cooling factors were included in the model. Findings – That the complex trends with increased oil flow is inconsistent with the traditional formula in which the effects of grooves were neglected. The fitting curve of optimal oil supply can predict various needed oil flow in various rotating speed and it provides a theoretical guidance for oil supply design. Originality/value – Traditional empirical formula of heat transfer coefficient and Reynolds equation solved by different methods could be difficult to deal with the complex boundary conditions of wet multi-disc brake. CFX model can solve the problem of complex boundary condition. The optimal oil supply curve can provide a theoretical guidance for oil supply design.

scholarly journals Tribo-Brake Characteristics between Brake Disc and Brake Shoe during Emergency Braking of Deep Coal Mine Hoist with the High Speed and Heavy Load

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5094
Author(s):  
Dagang Wang ◽  
Ruixin Wang ◽  
Tong Heng ◽  
Guozheng Xie ◽  
Dekun Zhang
Keyword(s):  
Coal Mine ◽  
High Speed ◽  
Brake Disc ◽  
Disc Brake ◽  
Heavy Load ◽  
Brake Shoe ◽  
Emergency Braking ◽  
Deep Coal Mine ◽  
Friction Disc ◽  
Mine Hoist

The friction wear and thermal fatigue cracking of the brake shoe and friction-induced self-excited vibration (frictional flutter) of the disc brake can easily occur during emergency braking of a deep coal mine hoist with at high speed and with a heavy load. Therefore, tribo-brake characteristics between the brake disc and brake shoe during emergency braking of a deep coal mine hoist are investigated in the present study. Scaled parameters of the disc brake of a deep coal mine hoist are determined by employing the similarity principle. Friction tests between friction disc and brake shoe are carried out to obtain the coefficient of friction in the case of high speed and large specific pressure between the friction disc and brake shoe. Coupled thermo-mechanical finite element analyses of the brake disc and brake shoe are established to investigate temperature and stress fields of the brake disc and brake shoe during emergency braking, which is validated by the engineering failure case. Effects of braking parameters on flutter characteristics between the brake disc and brake shoe are explored by employing a double-degrees-of-freedom vibration mechanism model. The results show that the maximum temperature, equivalent Von Mises stress and contact pressure are all located at the average friction radii of contact surfaces of the brake disc and brake shoe during emergency braking. The cage crashing accident in the case of high speed and heavy load in a typical coal mine shows crack marks and discontinuous burn marks at central locations of brake shoe and brake disc surfaces, respectively, which indicates frictional flutter characteristics between brake disc and brake shoe. During emergency braking, flutter time duration decreases with increasing initial braking speed and damping parameter; the flutter amplitude and frequency of the disc brake increases with increasing normal braking load and stiffness, respectively.

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