Self-rotatory performance of conical cutter interacted with rock material

Liu, Xiaohui; Tang, Ping; Li, Xuan; Tian, Mingrui

doi:10.1016/j.engfailanal.2017.06.030

Cited by 14 publications

(10 citation statements)

References 17 publications

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“…The cutting testbed is described in detail in reference [37] and is not mentioned again herein. Figure 4 shows the picks used in the experiments; the normal pick body is 81 mm in length, and the pick handle is 62 mm in length and 35:0 À0:27 À0:33 mm in diameter.…”

Section: Methodsmentioning

confidence: 99%

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Effect of contact characteristics on the self-rotation performance of conical picks based on impact dynamics modelling

Liu

Geng

2020

R. Soc. open sci.

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Conical picks have a harsh working environment and 70% of their failures are caused by wear. It has been found that conical picks can rotate while interacting with the working material. This self-rotation ability is an important factor affecting pick wear, but the self-rotation mechanism remains unclear. Researching the mechanism involves the impact and friction dynamics of the interaction between a pick and its holder. Thus, a dynamic finite-element numerical model for the pick–holder interaction is established. How the handle–holder gap width, pick body and handle lengths and pick handle diameter affect the settling time and the percentage of time with no contact is studied to compare the numerical results with the equivalent effects on the rotation angle in experiments. Doing so indicates that the main factor in the self-rotation ability of a conical pick is not the magnitude of the contact load but its duration. The present research provides a new method for revealing the mechanism for the self-rotation of conical picks.

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Section: Methodsmentioning

confidence: 99%

“…The principle is shown in figure 1c. Pick self-rotation has been studied experimentally [37] and is related to both the magnitude and duration of the contact load between the pick and its holder. However, it remains unclear whether it is the magnitude or the duration of the contact load that affects pick self-rotation the most.…”

Section: Introductionmentioning

confidence: 99%

Effect of contact characteristics on the self-rotation performance of conical picks based on impact dynamics modelling

Liu

Geng

2020

R. Soc. open sci.

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“…The rock texture implies the placement and distribution of minerals of its composition, as well as the presence of pores and micro-cracks. The texture can be massive, fluid, vesicular, striped, breccia and slate, [2,13].…”

Section: Petrographic Properties Of Investigated Rock Materialsmentioning

confidence: 99%

Analysis of Certain Physical Properties of Four Rock Materials

Lazić¹,

Arsić²,

Mutavdžić³

et al. 2020

Applied Engineering Letters

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“…The intensity of this process was dependent on the mechanical parameters of the rock medium. The dulling and wear of mining tools operating in contact with rocky media is a common phenomenon, e.g., [ 32 , 33 ], and leads to changes in the geometry of the tool cutting edge [ 31 ], an increase in its load and vibrations of the mining heads [ 34 , 35 , 36 , 37 ]. Tribological interactions between rock and tool are analyzed using FEM and DEM (Discrete Element Method) [ 38 , 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Undercut Anchor Head Angle on the Propagation of the Failure Zone of the Rock Medium—Part II

2021

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Problems concerning the influence of the geometric parameters of an undercutting anchor on the range of the failure zone of rock medium during the pulling out of the anchor constitute one of the aspects that arouse the interest of authors due to attempts to use undercutting anchors in the process of rock lump separation. This method is considered an alternative to the existing methods of separation, especially in special cases of mining technologies. This article presents the results of numerical investigations into the effect of changes in the head geometry that occur as a result of wear on the conical part of the undercutting anchor and the extent of failure of the rock medium during its pulling out. This is an extension of considerations presented in previous work, where special attention was paid to the influence of potential errors in anchor installation, leading to changes in head geometry and, consequently, to changes in the extent of the failure zone of the rock medium. As a result, significant changes in the volume of the detached rock masses are observed. This study shows that the increasing surface friction of the stripping anchor head leads to a decrease in the angle of the undercutting head. As a result, the extent of the failure zone measured on the free rock surface increases, the value of the angle of the failure cone at the initial stage of the stripping decreases, and the deformation of rock in the plane perpendicular to the anchor axis increases.

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Self-rotatory performance of conical cutter interacted with rock material

Cited by 14 publications

References 17 publications

Effect of contact characteristics on the self-rotation performance of conical picks based on impact dynamics modelling

Effect of contact characteristics on the self-rotation performance of conical picks based on impact dynamics modelling

Analysis of Certain Physical Properties of Four Rock Materials

Influence of the Undercut Anchor Head Angle on the Propagation of the Failure Zone of the Rock Medium—Part II

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