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:: Study on the influence of pin shaft clearance on the bearing performance of the hydraulic support
Autorzy:: Shunyi, Du
Yang, Yang
Powiązania:: https://bibliotekanauki.pl/articles/28328269.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: bearing capacity
orthogonal test
hydraulic support
pin clearance
multi-clearance coupling
Opis:: The pin clearance is a significant factor affecting the bearing capacity of the hydraulic support, but the effect of the pin clearance is often neglected in the current studies. Therefore, on the basis of considering the Equal stiffness spring damping system of the column, the dynamic simulation model of the hydraulic support without clearance was constructed to study the static bearing capacity of the hydraulic support. Moreover, as per the contact model of the connectingpin clearance, the dynamic simulation model of the single-pin clearance hydraulic support was established. The effect of single pin clearance on the load of the front and rear columns of the hydraulic support and the transmission force at key bearing points was analyzed. Meanwhile, the influence of single pin clearance at different positions on the bearing capacity of the hydraulic support was compared. Through the design of orthogonal test, the change of the transmission force of the bearing points under the coupling of multi-pin clearance was studied.
Źródło:: Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 174367
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Theoretical analysis of support stability in large dip angle coal seam mined with fully-mechanized top coal caving
Autorzy:: Ji, Yucheng
Zhang, Yinghua
Huang, Zhian
Shao, Zhenlu
Gao, Yukun
Powiązania:: https://bibliotekanauki.pl/articles/1402319.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:: large dip angle
hydraulic support
stability
coal
Opis:: Support stability is critical to ensure fully-mechanized top coal caving of large dip angle coal seam. To obtain the relations between each factor and hydraulic support stability, the mechanic model of large dip angle coal seam along face dip and strike was built to analyze support stability, including antitoppling, anti-slip, and anti-rotation of supports. The result indicates: Along the face dip, the suport stability was negatively correlated with dip angle; Higher top caving means lower anti-rotation at suport tail; With initial support force and working resistance of supports enhanced, the anti-slip, and antirotation stability of supports can be risen significantly. Along the strike, the critical toppling angle was proportional to dip angle, mining height, support weight, support width and support force; The critica slip angle was positive correlation with support force, friction coefficient of roof and supports. According to the results of both mechanical analysis and engineering projects, support stability in large dip angle can be risen efficiently and supports slipping, toppling and rotation can be avoided by selecting proper technical methods and equipment, like enhancing initial support force appropriately.
Źródło:: Mining Science; 2020, 27; 73-87
2300-9586
2353-5423
Pojawia się w:: Mining Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Influence of impact load form on dynamic response of chock-shield support
Autorzy:: Meng, Zhaosheng
Ma, Chen
Xie, Yunyue
Powiązania:: https://bibliotekanauki.pl/articles/27312794.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: hydraulic support
dynamic load
reliability analysis
mechanical-hydraulic co-simulation
Opis:: Chock-shield support is usually used in undergroud coal mining to protect the roof. However, as the mining depth gets deeper, impact load that came from the roof becomes stronger and more frequent. This causes the support to bear a large number of dynamic loads, and reducing its reliability. To improve the support performance of the chock-shield support, the mixed-kinetic model was established using the mechanical-hydraulic co-simulation method. The load distribution law of the support joint under impact load form different stability forces, impact load amplitude, and impact frequency is discussed. The mechanical-hydraulic cooperative response of the chock-shield support are obtained. The results show that different joints show typical non-uniformity characteristic during the loading process. The proposed mechanical-hydraulic co-simulation method can more accurately obtain the dangerous points of hydraulic support reliability. The results of this study will help to improve the reliability of the chock-shield support.
Źródło:: Eksploatacja i Niezawodność; 2023, 25, 3; art. no. 168316
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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