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.

scholarly journals Bicycle Disc Brake Thermal Performance: Combining Dynamometer Tests, Bicycle Experiments, and Modeling

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 100
Author(s):  
Ioan Feier ◽  
Joseph Way ◽  
Rob Redfield
Keyword(s):  
Thermal Model ◽  
Normal Force ◽  
Field Trials ◽  
Brake Disc ◽  
Disc Brake ◽  
Brake Pad ◽  
Brake Pads ◽  
Disc Brakes ◽  
Friction Curve ◽  
Friction Performance

High-power bicycle disc braking can create excessive temperatures and boiling brake fluid, resulting in performance degradation and damage. The goal of this work is to understand brake friction performance and thermal behavior for bicycle disc brakes. A previously described disc braking dynamometer is used to assess brake pad performance of sintered metallic brake pads, organic brake pads, and ‘power’ organic pads in up to 400 W of braking power. The friction coefficient is found to be dependent on both temperature and normal force. Friction curve fits are provided for temperatures between 300 K and 550 K. Organic and ‘power’ organic pads are found to have similar behavior, and have higher friction coefficients compared to metallic pads. Further, brakes on an instrumented bicycle are tested in outdoor field trials during downhill descent. A MATLAB thermal model successfully predicts the downhill field brake disc temperatures when using the friction data curve fits.

scholarly journals Influence of Disc Temperature on Ultrafine, Fine, and Coarse Particle Emissions of Passenger Car Disc Brakes with Organic and Inorganic Pad Binder Materials

Atmosphere ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 1060
Author(s):  
Hartmut Niemann ◽  
Hermann Winner ◽  
Christof Asbach ◽  
Heinz Kaminski ◽  
Georg Frentz ◽  
...  
Keyword(s):  
Systematic Variation ◽  
Coarse Particle ◽  
Brake Disc ◽  
Disc Brake ◽  
Aging Effects ◽  
Passenger Car ◽  
Particle Emissions ◽  
Inorganic Binder ◽  
Disc Brakes ◽  
Pm10 Emissions

Passenger car disc brakes are a source of ultrafine, fine, and coarse particles. It is estimated that 21% of total traffic-related PM10 emissions in urban environments originate from airborne brake wear particles. Particle number emission factors are in the magnitude of 1010 km−1 wheel brake during real-world driving conditions. Due to the complexity of the tribological processes and the limited observability of the friction zone between brake disc and pad, the phenomena causing particle emission of disc brakes are only partially understood. To generate a basis for understanding the emission process and, based on this, to clarify which influencing variables have how much potential for reduction measures, one approach consists in the identification and quantification of influencing variables in the form of emission maps. The subject of this publication is the influence of disc brake temperature on ultrafine, fine, and coarse particle emissions, which was investigated with a systematic variation of temperature during single brake events on an enclosed brake dynamometer. The systematic variation of temperature was achieved by increasing or decreasing the disc temperature stepwise which leads to a triangular temperature variation. Two types of brake pads were used with the main distinction in its chemical composition being organic and inorganic binder materials. The critical disc brake temperature for the generation of ultrafine particles based on nucleation is at approximately 180 °C for pads with an organic binder and at approximately 240 °C for pads with inorganic binder materials. Number concentration during those nucleation events decreased for successive events, probably due to aging effects. PM10 emissions increased by factor 2 due to an increase in temperature from 80 °C to 160 °C. The influence of temperature could be only repeatable measured for disc brake temperatures below 180 °C. Above this temperature, the emission behavior was dependent on the temperature history, which indicates also a critical temperature for PM10 relevant emissions but not in an increasing rather than a decreasing manner.

Study on Influence of Air Pressure on Braking Condition

2005 ◽  
Author(s):  
D. Chen ◽  
P. Huang
Keyword(s):  
Friction Coefficient ◽  
Applied Load ◽  
Polymer Matrix Composite ◽  
Air Pressure ◽  
Experimental Results ◽  
Disc Brake ◽  
Temperature Peak ◽  
Brake Pads ◽  
Friction Heat ◽  
Disc Brakes

In the present paper, air pressure and temperature on the interface of the polymer matrix composite (PMC) brake pads are measured by disc brake under braking condition, and their influences are studied as well. The experimental results show that the air temperature peak is not as high as that on the surface. The air pressure of the interface varies with the applied load. The air pressure is negative under the small applied load, but positive under the large applied load. The analysis of the experimental results shows that the phenomena are caused by the friction heat and the rotate disc. Since the air pressure is very small comparing with applied load, it influences on the friction coefficient slightly. But, the negative air pressure of the interface increases the chance of the drag friction in the non-braking mode for disc brakes.

scholarly journals The Application of Vibration Accelerations in the Assessment of Average Friction Coefficient of a Railway Brake Disc

2017 ◽  
Vol 17 (3) ◽  
pp. 125-134 ◽  
Author(s):  
Wojciech Sawczuk
Keyword(s):  
Friction Coefficient ◽  
Heat Dissipation ◽  
Brake Disc ◽  
Brake Pads ◽  
Rail Vehicles ◽  
Wide Range ◽  
Disc Brakes ◽  
Vibroacoustic Diagnostics ◽  
Braking Process

AbstractDue to their wide range of friction characteristics resulting from the application of different friction materials and good heat dissipation conditions, railway disc brakes have long replaced block brakes in many rail vehicles. A block brake still remains in use, however, in low speed cargo trains. The paper presents the assessment of the braking process through the analysis of vibrations generated by the components of the brake system during braking. It presents a possibility of a wider application of vibroacoustic diagnostics (VA), which aside from the assessment of technical conditions (wear of brake pads) also enables the determination of the changes of the average friction coefficient as a function of the braking onset speed. Vibration signals of XYZ were measured and analyzed. The analysis of the results has shown that there is a relation between the values of the point measures and the wear of the brake pads.

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.

Optimization of Design of Railway Disc Brake Pads

1996 ◽  
Vol 210 (1) ◽  
pp. 51-61 ◽  
Author(s):  
N Benseddiq ◽  
D Weichert ◽  
J Seidermann ◽  
M Minet
Keyword(s):  
Element Model ◽  
Lower Surface ◽  
Disc Brake ◽  
Two Dimensional ◽  
Bearing Surface ◽  
Braking Performance ◽  
Brake Pads ◽  
Disc Brakes ◽  
Dimensional Finite Element

High temperatures are one of the main problems encountered in disc brakes, contributing to rapid wear and poor braking performance. In this paper, a two-dimensional finite element model using a thermomechanical algorithm is used to predict the evolution of the bearing surface and temperature distribution at the interface between the disc and pad. After determination of the temperature of a conventional brake configuration, the behaviour of several modified friction pad designs is simulated numerically in order to improve contact and so to achieve lower surface temperatures.

Studies about Reflected Temperature Variation for the Car Brake Disc

2016 ◽  
Vol 822 ◽  
pp. 135-140
Author(s):  
George Dragomir ◽  
Rares Pancu ◽  
Geza Husi ◽  
Liviu Georgescu ◽  
Horia Beles
Keyword(s):  
Thermal Stress ◽  
Temperature Variation ◽  
Infrared Camera ◽  
Sliding Contact ◽  
Metallic Surface ◽  
Brake Disc ◽  
Brake Pads ◽  
Disk Brake ◽  
Disc Brakes ◽  
Exact Measurement

An exact measurement of the disc brakes car temperature present difficulties, because the higher thermal stress is produced on the shiny metallic surface, which are in movement and in sliding contact with the brake pads. If an infrared camera is used for the thermal evaluating of the disc brakes, an important factor that must be considered is the reflected temperature. The aim of this research is to study the modification of the reflected temperature in correlation with the disk brake temperature and to establish a relationship for the estimation of this variation.

scholarly journals Wear Induced Failure of Automotive Disc Brakes—A Case Study

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4214 ◽  
Author(s):  
Ali Mohammadnejad ◽  
Abbas Bahrami ◽  
Majid Goli ◽  
Hossein Dehbashi Nia ◽  
Peyman Taheri
Keyword(s):  
Wear Mechanisms ◽  
Optical Microscope ◽  
Outer Edge ◽  
Brake Disc ◽  
Disc Brake ◽  
Root Cause ◽  
Disc Brakes ◽  
Pin On Disc ◽  
Radial Cracks ◽  
Worn Surface

This paper investigated a failure in a ventilated disc brake in an automobile. The failed brake disc had been in service for approximately 10 years. The observed failure was in the form of radial cracks that appeared to have initiated at the outer edge of the disc brake. The cracks were rather straight with no branching. Optical microscope, scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDS) were used to study the microstructure of the failed disc. Vickers microhardness test was also used to evaluate the hardness of the samples. Results showed that the root cause of crack formation, in this case, was related to the excessive wear in the brake disc. Different wear mechanisms, namely abrasive and adhesive wear, were recognized in the failed specimen. Moreover, the worn surface in some areas was covered with fine oxide particles. These particles appeared to have a significant contribution toward abrasion. To further understand the wear mechanisms, pin-on-disc experiments were also conducted on the samples. Results of the pin-on-disc experiments were compared and correlated to the results obtained from the failed brake disc.

scholarly journals Thermal Analysis of a Disc

2021 ◽  
Vol 9 (10) ◽  
pp. 1910-1915
Author(s):  
Ratnajeet Wadile
Keyword(s):  
Thermal Analysis ◽  
Temperature Rise ◽  
Permissible Limit ◽  
Disc Brake ◽  
Brake Pads ◽  
Braking System ◽  
Analysis Tools ◽  
Disc Brakes ◽  
Ansys Workbench ◽  
Disk Brakes

Abstract: The disk brakes are special mechanized parts in a vehicle attached with the tires to help reduce the velocity of the vehicle. As the brake pads caused friction with the disc brakes, there is a temperature rise. Due to this there are great chances of disc brake’s failure if temperature rises above some permissible limit. Solidworks and ANSYS are the design and analysis tools which are used to accomplish this project. The disc brake was designed using Solidworks and it was analysed in ANSYS workbench. The main aim of this project is to analyse two-disc brakes manufactured with different materials to compare their properties and select one with most benefits. Keywords: ANSYS, FEA, Disc brake, Thermal analysis, braking system, Radiation.

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