Hydraulic longwall used in underground mining, especially as a shield-type support, comprises a footwall runner having a lifting device with a lifting cylinder held at one end

摘要

Hydraulic longwall used in underground mining, especially as a shield-type support, comprises a footwall runner (1) as a bearing surface for a hydraulic prop supporting a roof element, and an advancing mechanism (7) formed by a return rod (8) and an advancing cylinder (9). A footwall runner lifting device (16) having a lifting cylinder (17) is provided for lifting the footwall runner during the advancing process. The lifting cylinder is held at one end (20) in a holder (21) of a rocker (22) and is coupled at the other end (23) to a support (24) arranged on the footwall runner. The rocker is pivotably mounted at one end (25) on the footwall runner and is supported at the other end (26) on the return rod.