This article describes one approach for utilizing scrapers and dozers to strip all of the overburden and to replace it in an environmentally satisfactory fashion. The objective …

A dragline has more than hundreds of components and it is complex in design. This study involves the evaluation of reliability of a draglines system using a Bayesian network (BN) model mapped from ...

Among the various spider silks the major ampullate (MA) silk, which forms the primary dragline, is extremely tough. MA silk reveals a tensile strength that is comparable to Kevlar (4 × 10 9 N/m 2) coupled with a reasonable viscoelasticity (dragline 35 %, Kevlar 5 %).Spiders use dragline silk as a strong yet flexible structural element in …

The benefits of appending artificial forces and moments are demonstrated on an exemplar conventional dragline excavation system using a complex three-dimensional dynamic simulation model. In this model, the bucket, spreader bar, hoist cluster, and drag cluster are modeled as rigid bodies with 6 degrees of freedom apiece while the drag rope ...

The dragline is the mainstay in surface mining and plays a crucial role in the economic operation of large open cast mining projects. Draglines are very complex in design and consist of hundreds ...

Spider dragline silk is a natural fiber that has excellent tensile properties; however, it is difficult to produce artificially as a long, strong fiber. Here, the spider (Araneus ventricosus) dragline protein gene was cloned and a transgenic silkworm was generated, that expressed the fusion protein of the fibroin heavy chain and spider dragline protein in …

Journal Article: Dragline stripping: extended bench method. [Draglines] Dragline stripping: extended bench method. [Draglines] Full Record; Other Related Research; Abstract. In addition to increasing dragline working range and allowing easier scheduling, the method makes wider pits, which are safer and more productive and practical.

Abstract. Draglines are used for overburden removal to uncover coal. Planning and designing a dragline mining operation are a complex process that requires …

This research has studied the effect of a set of maintenance strategies and production stress on the reliability of a dragline using the concept of equivalent age. This …

In this article, we will look at the evolution of dragline excavators and their versatile uses in the modern construction industry. We will also explore the various types and benefits of …

We studied the mechanical properties of dragline threads of the edible golden silk spider Nephila edulis that are produced under spinning speeds ranging from 0.1 to 400 mm s −1 and temperatures ranging from 5 to 40°C. These conditions affected the silk in all of the mechanical traits we tested (strain at breaking, breaking energy, initial …

Other articles where scraper dredge is discussed: dredge: The scraper dredge, also called a dragline, handles material with a scoop suspended from a swinging boom. The scoop is drawn forward by a line attached to the front, while a second line attached to the rear holds the scoop at the proper angle to slice…

[Draglines] Dragline stripping: extended bench method. [Draglines] Full Record Related Research Abstract In addition to increasing dragline working range and allowing easier …

This article reports the determination of hot spot stresses in mining dragline booms, which are often >= 100m in length, using strain gage measurements and finite element analysis (FEA) modeling ...

It was detected from failure statistics that operations of Dragline-1 and Dragline-2 were halted for 938 and 903 times due to failures, yielding total breakdown duration of 13,954 and 16,471 h, respectively. Quantitative contribution of each subsystem to maintenance numbers and maintenance breakdowns can be viewed in Figure 2.

In addition, the failure analysis of dragline components have been analyzed and predicted fatigue life in welded joints through cracks and fracture [38][39][40], structure of dragline [41], swing ...

FRANKLIN, Kan. — Miners Hall Museum is proceeding with its plan to move a historic walking dragline from a rural area of northeastern Cherokee County to the junction of Kansas Highway 47 and U.S ...

A dragline has more than hundreds of components, and it is complex in design. This study involves the evaluation of the reliability of a draglines system using a …

The authors have developed a procedure for selecting models and number of draglines for overburden removal in direct dumping within the hybrid opencast/und …

Dragline is an HEMM used in coal mining for removal of overburden and dumping it into de-coaled area. ... Roshan Kumar Patel and Alok, Dr. Nawal Kishore. This is an open access article distributed ...

A dragline is a large rotating multi-body system to remove overburden in surface mining environment. The repeated dynamic, instantaneous loading accumulates …

Dragline-1 and Dragline-2 inspection intervals were optimised as 232 and 184 h and their maintenance costs were reduced by 5.9 and 6.2% compared to the current interval, respectively.

Artist rendering of Page 618 Walking Dragline. Inset the actual machinery that will be moved 30 miles and restored thanks in part to a Task Grant Award from Kansas Tourism SE Kansas Mining History preserved through donations: Page 618 Walking Dragline | Education | koamnewsnow

Dragline is an HEMM used in the opencast coal mines for removal of the overburden and its failure is undesirable as the capital invested on draglines are very high. This paper utilises the failure ...

In mining sectors, a dragline is used for removing overburden. The equipment consists of a number of subsystems. In mining industries, they have different bucket capacities and boom length. Dragline with a boom length of about 96 m and bucket capacity of around 24 m3 are most common. Sudden failure of any of its subsystem will …

SDS-PAGE analysis of dragline silk was conducted at IDEA Consultants, Inc. The dragline silk reeled from T. clavate was dissolved in 2 mL of ionic liquid (1-butyl-3-methylimidazolium acetate) per mg. After …

Traditional models for reliability analysis of mining equipment are developed from time to failure data. However, inclusion of operational data and environmental stressors in reliability analysis makes models realistic and can predict the reliability as well as availability of equipment more precisely. It also allows us to understand the aging …

where, R denotes the degree of reliability of the dragline stripping system; Q a denotes the actual production capacity of the dragline in m 3 per month; and Q d denotes the scheduled stripping volume of the dragline in m 3 per month. A dragline stripping system fault is defined as when the scheduled stripping task cannot be completed as …

Nephila spider dragline silk, on the other hand, typically has a strength of 1.3 GPa, a breaking elongation of 40%, and a toughness of 16 × 10 4 J kg −1 (ref. 4). These mechanical measures vary ...

2.1 Operation planning for draglines. The dragline operation planning problem has been addressed in only a small number of scholarly works. Previous work by Sier approached the problem by modelling the digging and dumping process as relocating sub-blocks of overburden to the destination locations above the spoil pile for a given dragline …

The purpose of choosing the dragline bench for the study was due to the importance of powder factor studies for dragline operations. The depth of each drill hole in all the ten study blasts was carefully monitored to evaluate the average drilling depth for the given blasted pattern. Similarly, the total explosive quantity loaded in the entire ...

With its incredible strength and toughness, spider dragline silk is widely lauded for its impressive material properties. Dragline silk is composed of two structural proteins, MaSp1 and MaSp2, which are encoded by members of the spidroin gene family. While previous studies have characterized the genes that encode the constituent …

@article{osti_5480481, title = {Operating guidelines for dragline stripping operations; analysis of tandem systems. Final technical report as of 31 August 1979}, author = {Cook, F. and Lappi, R. L.}, abstractNote = {Practical guidelines for choice of dragline block length, bench height, pit width, and dig/cast patterns are developed for single seam, dragline …

The majority of spider silk proteins (spidroins), including major ampullate spidroins (MaSps, which form the dragline silk) and minor ampullate spidroins (MiSps, which form the auxiliary web ...

Dragline is an HEMM used in coal mining for removal of overburden and dumping it into de-coaled area. Failure of dragline contributed to total downtime of 4955 h in 28-month (2014–16) period and ...