A new method has been developed for calculation of drilling-and-blasting operations parameters during mining with emulsion explosives application, which results in minimization of energy ...

A user friendly object-oriented software package is developed in Matlab R2010b to overcome the tiresome shaft lining thickness calculations. The package allows users to enter and change inputs any time at input window and see the design of the liner along the shaft depth graphically and numerically based on Eq. (13).

Power Transmission Shaft Design Formulas and Calculator for Torsional Stress, Bending Stress and Tensile or Compressive Stress. Shaft design consists primarily of the determination of the correct shaft diameter to ensure satisfactory strength and rigidity when the shaft is transmitting power under various operating conditions. Shaft are usually ...

See Full PDFDownload PDF. TUNNELS, SHAFT AND DEVELOPMENT HEADINGS BLAST DESIGN INTRODUCTION Tunnels, shafts, and raises are developed for a variety of purposes. In mines development headings provide; mine access for men and materials, ore and waste hoisting, and ventilation paths. Shafts are also used in civil construction …

The calculation is designed for geometrical designs and complex examinations of shafts. The programme solves the following tasks: Simple definition of installed shafts, including hollow ones. Options of definitions of necking-down, recesses, grooves and calculation of the relevant coefficients of stress concentration.

First Online: 10 June 2023. pp 1. Cite this living reference work entry. Ma Junsheng & Xu Kuangdi. 10 Accesses. Download reference work entry PDF. Vertical shaft is an upright …

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The lining of a shaft performs several functions including stabilising the walls of the shaft, providing structural support to the guides for the conveyancing systems, as well as to optimising air flow for the mine ventilation design. Therefore, selection of the most appropriate type of shaft lining needs to be considered during the design ...

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Shaft stability evaluation (SSE) is one of the most crucial and important tasks in view of the role of vertical shaft in mining engineering, the accuracy of which determines the safety of on-site workers and the production rate of target mine largely. Existing artificial methods are limited to the amount of data and complex process of …

Preview ASME Design Code for the design of Transmission Shafting Calculator. According to Fuchs and Stephens (1980), between 50% and 90% of all mechanical failures are fatigue failures. This challenges the engineer to consider the possibility of fatigue failure at the design stage. Figure 1 shows the characteristic variation of fatigue strength ...

Summary . Criteria for shaft design are described and methods of design developed. Among aspects covered in detail are: selection of shaft locations; shaft collar design …

Bending of circular shafts. 20. Example Problem 17-1: Design Stresses in Shafts. • Shaft shown drives a gear set that is transmitting 5. hp at 1750 rpm. • Shaft is supported in self-aligning ball bearings. and gears are both 10 pitch, 40 tooth, 20° spur. gears. • Find torsional and bending stresses in shaft.

Published 1 July 2021. 1. Scope. This guidance note provides the Coal Authority's minimum required standards for Designers seeking engineering appraisal of their design proposals. Any geotechnical ...

A shaft is a rotating or stationary component which is normally circular in section. A shaft is normally designed to transfer torque from a driving device to a driven device. If the shaft is rotating, it is generally transferring power and if the shaft is operating without rotary motion it is simply transmitting torque and is probably resisting ...

Article Content Links: Shaft Materials, Shaft Layout, Torque Transmission, Calculating Static Stresses, Dynamic Stresses and Fatigue, Determining Critical Stress Locations, Deflection, Critical Speed A shaft is a mechanical part that normally has a circular cross-section. It is used to transmit power through rotation. It provides an axis of rotation for a …

From this maximum operating torque, we can find the shaft diameter with the above equation. 2070.06 x 10 3 N-mm = (70Mpa (N-mm 2) x π x d 3 )16. d 3 = 150687.075 mm. d = 53.19 mm. The required …

Shaft design receives little attention in the mining and civil engineering literature, and shafts are still constructed predominately on the basis of precedent and prior experience. One of the reasons for this situation is the lack of well established geotechnical design criteria which could define procedures to delineate the disturbed (yielded ...

vertical circular shaft and a decline are required to be developed for transporting man, material and air. It is decided that the shaft and the portal of the decline will be located in the ...

MINE WINDERS . PART 3 VERTICAL SHAFT WINDERS . there are many installations operating in the NSW mining design, construction and maintenance of shaft powered . Get Price; Tutorial for gear design and calculation with MDESIGN gearbox. Tutorial for gear design and calculation with MDESIGN gearbox 4.3 Calculation of the shafts …

To provide an improved working environment, future shaft diameters will generally be greater than has historically been the case for the Australian hard rock mining …

10.1 Introduction to Transmission Shaft Analysis. This section presents design methods for mechanical shafting. In this discussion, a shaft is defined as a rotating member, usually circular, which is used to transmit power. Although normal and shear stresses due to torsion and bending are the usual design case, axial loading may also be present ...

Hollow Shaft Design Calculator Units Outside diameter d o = in Inside diameter d i = in Torsional moment M t = in-lb Bending Moment M b = in-lb Axial load F a = lb Calculated Results Torsional shear stress Eq. 2 τ xy = lb/in 2: Bending stress Eq. 4 s b = lb/in 2: Tensile or compressive stress Eq. 6 s a = lb/in 2

362 Mechanical Engineering Design. Figure 7–1. A vertical worm-gear speed reducer. (Courtesy of the Cleveland Gear Company.) Figure 7–2. (a) Choose a shaft configuration to support and locate the two gears and two bearings. (b) Solution uses an integral pinion, three shaft shoulders, key and keyway, and sleeve.

14.1 Introduction. Shaft is a common machine element which is used to transmit rotary motion or torque. It generally has circular cross-section and can be solid or hollow. Shafts are supported on the bearings and transmit torque with the help of gears, belts and pulleys etc. Shafts are generally subjected to bending moment, torsion and axial ...

where, q is the heat flux [W]. A is the area through which q passes [m 2]. k is the thermal conductivity [W/(m°C)]. θ is the temperature [°C]. x is the vertical distance [m]. The thermal conductivity, k, is a slowly changing function of temperature.The depth of the intake shaft where heat flow reverses varies by season (to some extent even daily), …

eBook ISBN 9781003078944. ABSTRACT. Shaft design receives little attention in the mining and civil engineering literature, and …

shaft stresses, the stresses in the shaft in cases of sloping bedrock, and the distribution of surcharge pressures on the shaft walls. The results showed that the earth pressures acting on the exterior surfaces of the shaft wall remained between active and at-rest values. The

Further, it has been established that the velocity of the air current in downcast shafts is generally limited to a figure of 500.600 metres per minute, whereas in the upcast shaft …

Determination of a lining thickness around a circular mine shaft. can be done by using one of the three methods: numerical, empir-. ical or analytical. Because of the similarity of the shaft ...

Shaft system. Shaft operating costs (Table IX) are based on rates provided by a South African shaft-sinking company based a production rate of 80 000 t/month. The size, speed, and cycle time of the skip based on a 20 t skip travelling at 15 m/s was used as a basis for estimating the shaft operating costs.

Decline design in underground mines using. constrained path optimisation. M. Brazil P .A. Grossman D.H. Lee J.H. Rubinstein D.A. Thomas. N.C. W ormald ∗. Abstract — In this paper we focus on ...