Introduction

Kotwica, Krzysztof

doi:10.1007/978-3-030-96394-1_1

Cited by 1 publication

(2 citation statements)

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“…The system of hydrodynamic rotation of picks combined with effective spraying is particularly suitable for use with cutting picks with ring-type tips. It can also be employed for other types of tangential-rotary picks, for example, crown picks 22 . This solution can easily be adapted for use in machines for milling surfaces of roads, squares, and airport runways in the process of their renovation.…”

Section: Discussionmentioning

confidence: 99%

“…There are many technical solutions for sprinkling, which have been described in detail, for example, in previous works 20 , 21 . In the case of tangential-rotary (conical) picks on the cutter head or cutter drum of mining machines, there are two main ways to direct the spray water stream: in front of the pick and behind the pick 22 . Attempts to use a central water supply through the tip of the pick are the most effective, especially because the high-pressure water jet supports for the mining process 21 , 23 , 24 have not become popular due to numerous technical difficulties, including the clogging susceptibility of spray nozzles.…”

Section: Introductionmentioning

confidence: 99%

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Improving the operational durability of tangential-rotary picks for rock cutting with central spraying and hydrodynamic rotation

Cheluszka,

Mikuła,

Mikuła

et al. 2024

Sci Rep

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This article presents a proposal for a new solution of tangential-rotary picks intended for mining, especially hard rocks with roadheaders. The design of these picks is characterized by many innovative solutions aimed at significantly increasing their service life. The method to achieve this goal is to provide effective central spraying of the ring tip picks, crown picks, or similar types of picks while using the spray water to cause the picks to rotate as they contact the rock being mined. An important element of the work is to conduct extensive simulation studies using FEM to determine the stress distribution in the pick shank subjected to external load from cutting. The new design of the tangential-rotary pick is equipped with a reinforcing sleeve, in which a state of compressive stress is induced. This enables a significant improvement in the fatigue strength of the pick shanks. The conducted FEM comparative tests confirm the accuracy of the adopted design assumptions. They also determine the beneficial value of the tension nut torque, which tightens the reinforcing sleeve located on the pick shank.

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Section: Discussionmentioning

confidence: 99%