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To meet the requirement of the braking response of the coal mine hoist, a new electromechanical braking technology for mine hoists is proposed, the principle of electromechanical braking of mine hoists is demonstrated, and the detailed parameters and braking performance of electromechanical brakes are given. Index, an electromechanical brake test p...
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... Coal is an important energy support for industrial development, with the continuous exploitation of mineral resources, the depth of mine mining is increasing, which prompts the continuous development and progress of mine hoisting and transport technology [1][2][3]. The mine hoisting system serves as a crucial transportation link in the coal production process. ...
A hoist load monitoring method based on machine vision technology is proposed in this paper to address the frequent overloading accidents of mine hoists and the low safety and reliability of existing contact load monitoring technologies. The depth image of the skip undergoes time domain and spatial bilateral filtering algorithms for noise reduction, followed by conditional filtering and downsampling algorithms to remove redundant point cloud data. Point cloud recognition, extraction, segmentation, and alignment algorithms are then applied to quickly generate a skip point cloud model. A surface reconstruction optimization process combining greedy projection triangulation algorithm and void repair algorithm is proposed to obtain a smooth and complete sealing of the skip. The closed surface model volume is calculated using VTK volume function. Based on single-rope winding hoist, a load visual monitoring system is constructed for relevant experimental research. Results show that this method can accurately measure the loaded coal volume with a relative error range of 0.05%–4.13%, meeting practical application requirements while providing an effective way for non-contact accurate measurement of hoist loads in mines.
... The magnitude of the generated clamping force is affected by various parameters, such as screw geometry, motor parameters, control mechanism, friction between pads and brakes disk and wear. Huawei et al. [11], proved experimentally there is a linear relationship between the brake input current and the generated clamping force. It was found that there is a cubic relationship between the screw movement and the generated clamping force [11]. ...
... Huawei et al. [11], proved experimentally there is a linear relationship between the brake input current and the generated clamping force. It was found that there is a cubic relationship between the screw movement and the generated clamping force [11]. The effect of different parameters such as motor parameters, control mechanism, vehicle weight, ratio of screw length to its cross-sectional area, coefficient of friction between the brake disk and pads, and the addition of an automatic wear adjustment system to the generated clamping force were investigated experimentally and/or estimated using mathematical models and/or simulation models based on kinematics and dynamics of different applications as discussed in [2,[7][8][9][10][12][13][14][15][16][17][18]. ...
... For the second phase, the response of the proposed EMB system model was verified against previous experimental and mathematical simulation models of EMB systems used in non-passenger vehicle applications obtained from literature [10,11,24]. The verification process was comparing the system output results using the same lead and reduction ratio as input data. ...
Electro-mechanical brakes (EMB) are promising alternatives to conventional braking systems, as they are eco-friendly and have lower maintenance requirements. Currently, researchers and automotive manufacturers are interested in developing the performance of EMB systems for implementation in commercial vehicles. Current studies are either conducted experimentally and/ or modeled using mathematical based simulation models using different vehicles kinematic and dynamic models. These models are time-consuming, and expensive in case of experimental implementation. This paper presents a simple and easy-to-construct simulation model using MATLAB Simulink Graphical user interface (GUI) without using conventional mathematical modelling techniques. The presented simulation model studies the effect of the lead screw size on performance of EMB in terms of the generated clamping force and system response time. The accuracy and reliability of the proposed model were statistically verified using ANOVA. In addition, its performance was verified by comparing its results with the same input data used in previously validated experimental and mathematical-based simulation models from the literature review. The proposed model can be used to improve the performance of EMB systems and facilitate comparisons among different EMB designs.
... At present, there are more abundant studies on inclined shaft hoisting systems at home and abroad [6,7]. In the application of slant shaft hoisting system design, Li et al. [8] used the method of scheme comparison to select the optimal hoisting system transportation scheme for the Dianchi water replenishment Dawushan tunnel project. ...
... The calculated parameters of the hoisting system motor and the skywheel are shown in Table 4. Substitute the calculated parameters into the Formulas (4)- (7) to get the motor lifting speed V m = 2.45 m/s < 5 m/s, to meet the specification requirements. Motor lifting power N = 213.7 KW, reducer permissible input power PC = 562.5 KW. ...
As a key transportation equipment in the construction of long tunnels with large slope, the material hoisting system plays an important role in the transportation of materials in sloping shafts. This paper proposes a parameterized calibration scheme for the hoisting system based on the structure and working principle of the hoisting system, taking the wire rope, hoist, motor and overhead wheel as the research objects, and according to the relevant industry specifications and numerical calculation methods. Based on the structural design and functional analysis of the hoisting system, a reasonable control system, monitoring system and safety protection devices are designed, and the calibration scheme and the designed system are introduced into the Dianzhong water diversion project for verification. The parameters of each component of the hoisting system were calculated as follows: maximum breaking tension value of wire rope 490.29 KN, drum diameter 2000 mm, motor hoisting power 213.7 KW, and the system design was as follows: control system selects frequency conversion electric control method, safety protection device selects ZDC30-2.5 anti-running device. The results show that: the hoisting system components structure parameters meet the specification requirements—safety protection devices can effectively prevent the occurrence of sports car slippage and man-car jumping rail overturning accident—to meet the requirements of the construction period transport capacity and transport safety. The relevant experience can provide the basis for the design of a material hoisting system for a similar inclined shaft construction.
... It realizes the full electrification of the friction brake, completely free from the dependence on the braking medium, and completes the transformation from compressed air or hydraulic drive to electric drive. Compared to traditional air or hydraulic braking systems, the advantages of electro-mechanical braking systems include light weighting of the system, improved 1 system control performance, reduced failure points and improved maintenance, improved energy efficiency and intelligence. Currently, new advanced aircraft such as the US Global Hawk UAV, F16 fighter jet, and Boeing 787 are all officially using electro-mechanical braking systems, and the widespread use of electro-mechanical braking systems on the next generation of aircraft has become a definite situation. ...
... In mining machinery, electro-mechanical braking systems have been used in place of hydraulic disc brakes in the field of mine hoists. 1 Based on safety considerations, the use of electro-mechanical braking systems is inevitable without fault diagnosis, so the fault analysis of electro-mechanical braking systems cannot be ignored. ...
The brake disc spindle of the electromechanical braking system will be accompanied by vibration unbalanced fault during the rotation operation, which will affect the braking performance of the brake system. In view of this phenomenon, based on the ensemble empirical mode decomposition algorithm and related energy operation theory, an offline purification program for the unbalanced axial trajectory of the spindle of electromechanical braking system are designed. Meanwhile, an online braking control feedback procedure for the axial trajectory are designed based on Cspace controller. Based on the designed program and braking theory, an experimental bench of the electro-mechanical braking system was set up, and experiments were conducted on the purification of the axial trajectory and the braking of the fault feedback respectively. The results show that the EEMD algorithm and the related energy operation theory can purify the unbalanced axial trajectory of the brake discs of the braking system and draw an ideal axial trajectory fault map; meanwhile, the experimental data of the fault feedback braking shows that the time required from the unbalanced fault monitoring to the completion of the braking process of the braking system is 1.278 s, which can effectively achieve the purpose of emergency braking in case of sudden failure. Through research, a new idea is provided for the development of electro-mechanical braking system fault detection and feedback.
Friction materials have played a crucial role in safe movement of automobiles and in protection of human life. Enormous cost has incurred in validation of new developed brake pad, a critical safety component, as it involves a lot of inhouse testing along with field testing in different terrains. Further, with an unexpected pandemic and wars, creeping raw material price increases which is a major issue even though researchers have tried to develop innovative materials, which can perform multitasks. Moreover, a paradigm shift towards hybrid and electric vehicles required adjustments in design strategies, related to new friction materials for brakes. The regenerative braking mechanism has taken a major role in electric vehicles (EVs). Therefore, the friction pad is rarely used, which leads to rust/corrosion issues. In addition, the exhaust particles now pale in comparison to non-exhaust emissions. It is a newly identified challenge faced by friction industry as the brake pad wear is one of main contributors of non-exhaust emissions. Also, with no engine noise to cover, the silent nature of EVs creates noise and vibration issues in brake pad even more apparent. Hence, this paper has focused critically on challenges for friction material manufacturers in terms of regulations and raw materials followed by environmental issues and shift towards EVs and NVH requirement. Further, it has discussed with some possible suggestions to reduce the same.
