Computational Fluid Dynamics Simulations for Investigation of the Damage Causes in Safety Elements of Powered Roof Supports—A Case Study

Świątek, Janina; Janoszek, Tomasz; Cichy, Tomasz; Stoiński, K.

doi:10.3390/en14041027

Cited by 17 publications

(13 citation statements)

References 8 publications

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“…It can be seen from Figure 12 that in condition (b), the analysis of reference [30,31] also supports this result, the stress values of the movable column and the two-level guide sleeve are significantly increased, and the maximum stress point of the two-level cylinder is transferred to the bottom of the cylinder, and the stress value of area A in the two-level cylinder is significantly increased. However, the one-level cylinder and its guide sleeve stress change little.…”

Section: Dynamic Characteristics Of the Column Solid Domainsupporting

confidence: 57%

Research on Dynamic Characteristics of Canopy and Column of Hydraulic Support under Impact Load

Zeng

Wan

et al. 2022

Energies

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In the process of coal mining, the canopy and column play an important role in the safety support of hydraulic support. However, due to the complex and changeable coal seam conditions, the hydraulic support is significantly affected by the impact load. This paper aims to reveal the dynamic characteristics of canopy and column under impact load. Firstly, the dynamic model of hydraulic support is established, and the impact response of each hinge point of the canopy is analyzed. Secondly, based on the fluid–structure interaction (FSI) theory, the two-way FSI model of the column is established, and the structural change of the column and the flow field characteristics in the cylinder under the impact load are analyzed. The results show that the front column hinge is more prone to impact failure under impact load. The impact load has a significant impact on the two-level cylinder, the pressure in the cylinder increases, and an eddy current occurs on both sides of the bottom of the cylinder. The research results can provide references for the structural optimization of the hydraulic support with anti-impact load and the strength design of the column.

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Section: Dynamic Characteristics Of the Column Solid Domainsupporting

confidence: 57%

Research on Dynamic Characteristics of Canopy and Column of Hydraulic Support under Impact Load

Zeng

Wan

et al. 2022

Energies

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“…The powered support (Figure 1) is one of the key elements of longwall systems, next to the extracting machine (shearer or plow) and the scraper conveyor. Its main task is to control the roof and protect the crew working along the wall and other machines against the fall of the roof rocks and against the chunks of coal falling off the face of the longwall [44][45][46][47]. The support moves behind the front of the wall and, at the same time, is responsible for moving the gutters of the wall scraper conveyor.…”

Section: Introductionmentioning

confidence: 99%

Development of a Hydraulic System for the Automatic Expansion of Powered Roof Support

Szurgacz

Borska²,

Diederichs³

et al. 2022

Energies

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A mechanical support in a longwall complex requires proper supervision and control of operating parameters because it is responsible for the safety of machines and workers. Its main functions are to protect the excavation against the adverse effects of rock mass and to move it along with the operational progress of the shearer and the scraper conveyor. In the era of Industry 4.0 as well as green economy and sustainable development, the development of machines and devices included in the longwall complex is an important area of invention. When it comes to the mechanical support included in the longwall complex, the authors propose changes to the hydraulic control system. The main purpose of the work was to develop a system that can automatically expand the legs of the powered support. Tests were carried out under real conditions while equipping the support section with a prototypical hydraulic system and with a system monitoring the correct operation of the prototype. This article presents the development of a prototypical installation under real conditions for testing on a longwall. The innovative solution proposed by the authors consisted of introducing a prototypical double valve block into the hydraulic system of the housing, which enables the function of automatic section expansion. The authors proposed a solution aimed at shortening the work time of the powered-support-section operator. The research results made it possible to evaluate the usefulness of the proposed solution. This type of solution can be considered technical support in the process of coal mining in an underground mine. Analysis presented in this paper, along with results from research conducted and its conclusions, can be of practical help to enclosure users to improve reliability and achieve optimal performance.

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“…They enable the use of various design variants [26,27] in order to choose the most optimal solution based on the analysis [28,29]. Thanks to this, the final product, in this case a powered support, will meet the quality and safety requirements [30,31]. Due to the significant role of powered support in the production process, it is important for it to exhibit a high safety index [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study for Determining the Strength Limits of a Powered Longwall Support

Szurgacz

Trzop²,

Gil³

et al. 2022

Processes

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The process of designing a longwall powered support is extremely complex and requires many operations related to the creation of a complete machine. The powered support section is one of the basic elements of the longwall system. It acts as protection for the working space and takes part in the process of excavating and transporting the spoil. The implementation of the support that meets the guidelines of the manufacturer and user requires an endurance analysis at the design stage conducted according to the regulations in force. The main objective of this research, pursued by the authors, was to perform the analysis of the ultimate strength of selected elements of the designed powered support section. The research was carried out with the use of special software that uses the finite element method. This article presents the analysis of the strength limits conducted with the help of the finite element method, determining the strength of selected elements of the longwall support section. The solutions proposed by the authors include changes in the structure and properties of the material in the design process. The aim of the proposed solution was to obtain a model with strength value that meets safety standards. The research results are a valuable source of knowledge for designers. Solutions of this type set examples for spatial models of the longwall support section being designed currently. The analysis presented in the article, together with the results of the research and the conclusions resulting from them, may improve the safety and effectiveness of powered supports.

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Computational Fluid Dynamics Simulations for Investigation of the Damage Causes in Safety Elements of Powered Roof Supports—A Case Study

Cited by 17 publications

References 8 publications

Research on Dynamic Characteristics of Canopy and Column of Hydraulic Support under Impact Load

Research on Dynamic Characteristics of Canopy and Column of Hydraulic Support under Impact Load

Development of a Hydraulic System for the Automatic Expansion of Powered Roof Support

Numerical Study for Determining the Strength Limits of a Powered Longwall Support

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