Wszystkie pola: hydraulic support - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Dynamic characteristics study on the two-stage safety valve used on hydraulic support under impact loading
Autorzy:: Zhao, Guochao
Wang, Hui
Song, Yuning
Zhang, Changshuai
Powiązania:: https://bibliotekanauki.pl/articles/2055035.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: safety valve
impact loading
hydraulic support
dynamic characteristic
Opis:: A two-stage linkage safety valve for hydraulic support is presented. Considering the hydraulic support is impacted, dynamic simulation of the column circuit with the two-stage safety valve subject impact loading was carried out, and the dynamic characteristics of the two- -stage safety valve with different impact forms were studied. A rapid impact loading test rig was built to test the two-stage safety valve sample under impact loading. Simulation and experimental results indicate that the two-stage safety valve has high sensitivity and good unloading performance, it can realize fast and large flow unloading of the hydraulic support under different impact forms and pressures.
Źródło:: Journal of Theoretical and Applied Mechanics; 2020, 58, 3; 623--635
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Studies on the performance of impact resistant structure of hydraulic support in fully mechanized mining face under rock burst
Autorzy:: Zhang, Qiang
Zhang, Runxin
Powiązania:: https://bibliotekanauki.pl/articles/2200835.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: rock burst
energy absorbing structures
finite element
mechanical properties
Opis:: In order to solve the support problem of a fully mechanized coal face under rock burst and with the goal of safe and efficient coal mining, the present study hasenvisaged a hexagon periodic arrangement energy absorption structure. Based on the shell theory, the mechanical model of the impact resistant structure and hydraulic support was constructed using the finite element method. The mechanical properties of the hydraulic support under a full impact and a partial load impact of the roof were analysed, and the impact resistant structure was designed to prove the reliability of the structure. The results showed that the anti-impact structure reduced the stress and stress fluctuation of the column and effectively reduced the shape variable of the weak link of the hydraulic support. Furthermore, a delay in the time was observed, when the pressure of the hydraulic cylinder reached the yield strength, and there was a gain in the time for the opening of the large flow safety valve. Especially, under the action of partial load, the column did not bend, and the hydraulic cylinder was in the elastic range. Our results can provide new insights in the support of rock burst working face, which is of great significance concerning safety in the coal mining.
Źródło:: Journal of Theoretical and Applied Mechanics; 2022, 60, 4; 649--658
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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