| 摘要 |
Apparatus for controlling the position of a mineral mining machine, such as a plough, movable along a main guide at one side of a scraper-chain conveyor employs cantilevered beams extending between the conveyor and a series of roof supports. Each beam is preferably resiliently flexible and is connected, for example via a bracket at an opposite side of the conveyor, to the main guide. A device, such as a hydraulic piston and cylinder unit, is used to adjust the inclination between the beam and the guide in generally known manner. The end portion of the beam remote from the conveyor extends alongside a side mounting surface of the floor structure of an associated one of the supports which mounting surface faces the next adjacent support. A further guide means, which may take the form of a tube containing a ball or a similar guide member or a guideway along which a guide member is displaceable, is detachably secured to the mounting surface of the support. The guide member of the further guide means is connected to the end of the beam so as to support the latter while allowing some free pivotal displacement in all directions as well as displacement axially and parallel to the support. |
