Emergency Braking of a Mine Hoist in the Context of the Braking System Selection

Wolny, Stanisław

doi:10.1515/amsc-2017-0004

Cited by 12 publications

(11 citation statements)

References 1 publication

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“…The basic working operations of the loader working cycle were measured: the time of loading the raw material into the bucket, the driving time with the full bucket, the emptying of the raw material from the bucket on the lorry body, the driving time with the empty bucket back to the preparation for next loading and lost times. The arithmetic mean of the measured values of the loader working cycle (48 s) was added into Equation (7). The effective hourly performance of the loader represents 1.640 tonnes of raw material per shift, calculated according to Formula (7)-P L E = 205 tonnes per hour.…”

Section: Capacity Calculation Of Road Transport and Determination Of mentioning

confidence: 99%

“…In terms of the method of raw materials mining minerals, it is possible to identify two groups of transport systems: transport systems of raw materials in deep mining and transport systems of raw materials in surface mining. Existing transport methods that are feasible for deep mines include lorry transport, shaft systems, and belt conveyors [6,7]. Regarding the surface mining, it is the most common mining method worldwide, and open pit mining accounts for highest surface output.…”

Section: Introductionmentioning

confidence: 99%

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Modelling as a Tool for the Planning of the Transport System Performance in the Conditions of a Raw Material Mining

et al. 2020

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This article is devoted to modelling of the extracted raw material removal from a mining area to the entry point for the next technological process. Two approaches were chosen for the process modelling. The first approach is regarded to traffic modelling by using available mathematical equations, based on capacity conversion and calculation of loading equipment efficiency. The second approach of modelling is computer simulation within the simulation system ExtendSim8. The modelling of the transport system and the determination of its efficiency were performed at the same conditions. The examined transport system was consisted of two lorries and one loader. The article presents the results of calculations and the results of simulation experiments, which also verified the results obtained by calculations. Calculations of the transport system performance and simulation experiments were performed for two time periods, for a time of 1 h and 6 h during a shift from three different loading places, which were 500, 1100 and 1450 m away from a place of unloading. The results obtained by both approaches are comparable. The main contribution, novelty, of this article is the modelling of the process in a quarry operation (loading and removal of mineral resources) not only on the basis of available mathematical formulas but also the application of simulation in the simulation tool EXTENDSim8, performing simulation experiments for specified conditions and their comparison with calculated values. Simulation is a suitable tool for determining and subsequently planning of the performance of both existing and projected transport systems.

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Section: Capacity Calculation Of Road Transport and Determination Of mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling as a Tool for the Planning of the Transport System Performance in the Conditions of a Raw Material Mining

et al. 2020

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“…During dynamic operations, especially in severe conditions such as acceleration and emergency braking, the long-distance suspended rope will produce large elastic vibrations and tension impacts under the influence of the terminal heavy container [3][4][5]. The vibration impact produces not only longitudinal tension, but also horizontal and torsional vibration due to the transmission of the shock wave [6,7]. Especially when the depth and speed of the mine are continuously increasing, the time-varying characteristics of the rope length and the swirl of the wellbore gas flow [8] at the bottom of the container caused by the rapid speed change will intensify the vibration [3,9].…”

Section: Introductionmentioning

confidence: 99%

A New Transmission Theory of “Global Dynamic Wrap Angle” for Friction Hoist Combining Suspended and Wrapped Wire Rope

Guo

Zhang

et al. 2020

Applied Sciences

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A new transmission theory of "global dynamic wrap angle" for friction hoist is proposed. The theory is based on a mine hoist simulation model which combines the suspended rope with the wrapped rope. Rope dynamics in a suspended section are verified by the field experiment results. The theory holds that the mechanical state of wire rope is dynamic through the whole wrap angle, including deformation, contact and friction. When the rope enters the wrap angle, it provides positive friction and changes direction at a certain boundary point. The demarcation of the boundary depends on the rope load on both sides of the friction pulley. The theory is suitable for accurately analyzing the kinetics of high-speed and heavy-load friction hoisting.

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“…Dynamic effects in elements of mine winders have been studied in many works. In articles [1,2] the analytical expressions of maximum loads in rope in different operation conditions were obtained. In many articles numerical simulation was used [3,4].…”

mentioning

confidence: 99%

“…Researchers in the mentioned works used mathematical models which are based on ordinary [3] and partial [1] differential equations.…”

mentioning

confidence: 99%

Regime-parametric optimization of a mine winder deceleration

Ловейкін¹,

Romasevych²

2018

SBNMU

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Purpose. Improving mine winder operation efficiency during deceleration of the final cargo lowering due regimeparametric optimization and study the obtained results with dynamic and energy indicators. Methodology. In order to carry out the regime-parametric optimization of the mine winder deceleration mode the direct Euler's variational and differential evolution methods have been used. In order to study the approximate solution of the variational problem the mathematical modeling and integration of differential equations methods were used. findings. It was established that in comparison with rational laws of the mine winder deceleration using the optimum torque law reduces unwanted dynamic loads in the rope up to 28.4 %, and in the coupling by 15.4...82.7 %. In this case, the oscillations of the drive and the final cargo at the end of deceleration do not exist. In aggregate, it allows increasing the reliability of the mine winder. The optimal value of the reduced coefficient of coupling stiffness of the mine winder actuator has been established. Originality. The formulation of an optimization problem has been carried out. The complex terminal-integral criterion has been chosen. It was shown that in the formulation of the problem it is necessary to introduce the extra boundary conditions for achieving the absolute minimums of the terminal criteria. In order to find an approximate solution to the mine winder deceleration mode optimization problem, sampling of the problem was carried out. The solution of the problem was found on a set, which is the conjunction of two domains: the dynamic parameters of the mine winder and its modes of motion. Practical value. The calculated optimal deceleration mode of the machine may be implemented with the frequencycontrolled drive, which allows increasing the efficiency of the mine winder operation in terms of dynamic indicators.

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Emergency Braking of a Mine Hoist in the Context of the Braking System Selection

Cited by 12 publications

References 1 publication

Modelling as a Tool for the Planning of the Transport System Performance in the Conditions of a Raw Material Mining

Modelling as a Tool for the Planning of the Transport System Performance in the Conditions of a Raw Material Mining

A New Transmission Theory of “Global Dynamic Wrap Angle” for Friction Hoist Combining Suspended and Wrapped Wire Rope

Regime-parametric optimization of a mine winder deceleration

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