| 摘要 |
FIELD: mining industry. ^ SUBSTANCE: device has engaged ceiling, border, back cross-beam, each assembly of which has extending sides located oppositely on both sides of support, which sides are controlled by one or several hydraulic jacks placed in pairs and coaxially, and fixed in central portion of metallic construction. Each hydraulic jack is provided with adjusting insert placed in the guide on the side of extending side. Heads of rods of hydraulic jacks are connected to central portion of metallic construction and are provided with sockets for feeding of working liquid to hydraulic jack. Hydraulic jacks rods heads may be connected to central portion of metallic construction by a common finger or each with its own finger. Guide, adjusting insert and extending side ,ay be connected by common finger. ^ EFFECT: higher reliability of operation and higher safety. ^ 8 cl, 3 dwg |
