PL159973B1 - Shifter for alternately shifting either of two adjacent double-prop roof support units - Google Patents

Abstract

Shifter for the set of a double door section of mine lining, containing a hydraulic servo motor fastened to articulated polygons fixed to roof-bars of front and rear sets, characterised in that to the servo motor (6) cylinder (5) a guide (10) is attached in which there is a guiding bar (11) positioned parallel to the servo motor (6) piston rod (4) and having one end fixed to the articulated polygon (3) of the front set or the articulated polygon (7) of the rear set.<IMAGE>

Description

The subject of the invention is a shifter for the arches of a two-door section of mining support, which is used for sequential displacement of arches in relation to each other in longwall workings.

There is a known slider for the arches of the two-door section of the mining support in the form of a hydraulic cylinder connecting the front and rear arches through articulated polygons fixed to the canopy. When moving the support frames towards each other into the newly formed field by excavating the rock, the entire load from the weight of the rock is absorbed by the piston, piston rod and cylinder of the actuator. As a result, the cylinder, especially its piston rod, is exposed to bending, and the piston and cylinder to abrasion and denting. The disadvantage of such a shifter is its low wear resistance and the inability to run the sliding arches parallel to the spread arches, which is particularly troublesome in the case of workings inclined transversely, because the sliding arches may rotate and be angled to the ceiling and floor.

The essence of the actuator according to the invention, comprising a hydraulic cylinder attached to the articulated polygons attached to the canopy of the front and rear arches, is that a guide is attached to the cylinder of the actuator, in which a guide in the form of a rod parallel to the piston rod of the actuator is mounted. One end of the guide is attached to the articulated polygon of the front arches or the articulated polygon of the rear arches.

The advantage of the slider according to the invention is increasing the durability of the actuator and enabling the sliding arches to be guided in the stretched arches.

The subject of the invention is shown in the embodiment on the drawing showing a geometrical diagram of a two-door section of the mining support in a side view. An articulated polygon 3 is attached to the canopy 1 of the front arch, resting on the uprights 2. One of the polygon 3 arms is connected by the piston rod 4 and the cylinder 5 of the actuator 6 with the arm of the articulated polygon 7 attached to the canopy 8 rear arches resting on the uprights 9. A cylinder-shaped guide 10 is attached to the cylinder 5, in which a rod-shaped guide 11 is arranged parallel to the piston rod 4, one end of which is attached to the arm of the articulated polygon 3 of the front door frame.

1519973

159 973

Department of Publishing of the UP RP. Circulation of 90 copies. Price: PLN 10,000

Claims (1)

Patent claim A slider for the door of the two-door section of the mining support, containing a hydraulic cylinder attached to the articulated polygons attached to the front and rear door canopies, characterized in that a guide (10) is attached to the cylinder (5) of the actuator (6), in which the guide (11) is mounted ) in the form of a rod parallel to the piston rod (4) of the actuator (6) and one end of which is attached to the articulated polygon (3) of the front arches or the articulated polygon (7) of the rear arches.