Analysis of the Protection Performance of Face Guard for Large Mining Height Hydraulic Support

Wan, Lirong; Zhang, Shuai; Meng, Zhaosheng; Xie, Y. Y.

doi:10.1155/2021/6631017

Cited by 4 publications

(4 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this paper, the force exerted by the coal wall on the face guard is simplified to a concentrated force in order to facilitate analysis. Furthermore, because of the most frequent occurrence of coal wall spalling above the middle of the coal seam 33 , 34 , only the primary and secondary face guards play a crucial role in maintaining the coal wall stability, the tertiary face guard have a large moment arm but exert relatively small force, allowing us to disregard their bearing capacity on the coal wall. Hence, the force analysis needs to focus solely on the face guards of primary and secondary in two structures.…”

Section: Methodsmentioning

confidence: 99%

Research on the hydraulic support face guard mechanism and coupling characteristic of rib spalling in large mining heights

Zeng,

Ma,

Wan

et al. 2024

Sci Rep

Self Cite

View full text Add to dashboard Cite

In view of the problem of poor coupling adaptability and easy rib spalling of coal wall in large mining height comprehensive mining, based on the effective inhibition effect of face guard mechanism on coal wall spalling, the structural characteristics and bearing capacity of different structural forms of the face guard mechanism are compared and analyzed. According to the surrounding rock adaptability of the face guard mechanism, established a numerical analysis model for rigid-flexible coupling of the face guard mechanism under different spalling forms. In order to accurately simulate the stress state of the protective mechanism, a variable stiffness spring damping system is used to replace the hydraulic cylinder. The load-bearing performance and response characteristics of the face guard mechanism under rib spalling coupling conditions were analyzed by applying uniform normal load and impact load to the face guard. The findings indicated that, the integral-type face guard mechanism has a better effect on suppressing rib spalling. When the face guard mechanism bears the static load of the coal wall, the entire response process of the face guard jack can be divided into three stages: initial support, increasing resistance bearing, constant resistance bearing; both the impact load position and the coupling state of the rib spalling will affect the characteristics of force transmission at the face guard mechanism’s hinge point, the hinge point between the extensible canopy and the primary face guard is most sensitive to biased load. The research results can provide reference for optimizing the face guard mechanism of large mining height hydraulic support and improving the reliability of coal wall support.

show abstract

Section: Methodsmentioning

confidence: 99%

Research on the hydraulic support face guard mechanism and coupling characteristic of rib spalling in large mining heights

Zeng,

Ma,

Wan

et al. 2024

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…The connection among the telescopic beam, face guard, face guard jack, and other components is defined as a rotating pair. The first-level face guard jack is defined as a moving pair, and the different levels of face guard are defined as a fixed connection [20]. A driving force is applied to the rotating pair of the first-level face guard jack to control the extension speed of the two types of first-level face guard jack to reach 100 mm/s.…”

Section: Numerical Model Of the Face Guard Mechanism By Using Adams Softwarementioning

confidence: 99%

Stability of a Face Guard in a Large Mining Height Working Face

Wang¹,

Zeng²,

Wang³

et al. 2021

Int. j. simul. model.

View full text Add to dashboard Cite

Hydraulic support is an important piece of equipment in a fully mechanized mining face, and it is used to prevent the roof from falling out of control and protect the workers underground. The stability of hydraulic support under different conditions is related to security and must be taken seriously. To analyse the mechanical response of hydraulic support, a rigid-flexible coupling numerical analysis model of the face guard mechanism, which is part of hydraulic support, is established based on the multi-body dynamics software ADAMS. The equivalent spring is used to replace the face sprag ram to analyse the influence of the structural types of face guards on the stability of a coal wall under various coupling conditions with a coal wall. The support characteristics of the face guard mechanism are also explored. Results show that the errors of the contact characteristics of the face guard mechanism between the theoretical and numerical calculations are less than 3 %. Compared with the split face guard, the integral face guard exhibits greater flexibility and more favourable stability under different coupling states. The study provides a reference for optimizing face guards with hydraulic support.

show abstract

“…In order for the support to perform its functions properly, it is important to select it correctly, taking into account the mining and geological conditions and parameters of the wall. Recent research in the development of supports is presented in the works [48][49][50][51][52][53][54][55][56][57]. Currently, leg and protection supports with a lemniscate canopy guiding mechanism are commonly used.…”

Section: Introductionmentioning

confidence: 99%

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

Szurgacz

Borska²,

Diederichs³

et al. 2022

Energies

View full text Add to dashboard Cite

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.

show abstract

Analysis of the Protection Performance of Face Guard for Large Mining Height Hydraulic Support

Cited by 4 publications

References 27 publications

Research on the hydraulic support face guard mechanism and coupling characteristic of rib spalling in large mining heights

Research on the hydraulic support face guard mechanism and coupling characteristic of rib spalling in large mining heights

Stability of a Face Guard in a Large Mining Height Working Face

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

Contact Info

Product

Resources

About