Apparatus for protecting roof tray when gob-side entry retaining end support migrates

An apparatus for protecting a roof tray when a gob-side entry retaining end support migrates, comprising:

• a movable bearing mechanism,
• an automatic expansion-contraction connecting groove mechanism, and
• an active reset mechanism;
• wherein
• the apparatus is mounted at a top end position of a hydraulic support;
• the movable bearing mechanism comprises two conveying belts and a plurality of rollers, wherein the two conveying belts are parallel to each other and are of an equal length;
• the plurality of rollers are matched with the two conveying belts and support the two conveying belts, and the plurality of rollers are mounted on and supported by a bearing mechanism;
• the automatic expansion-contraction connecting groove mechanism is two concave base plates, wherein the two concave base plates are fixed between the two conveying belts, and the two concave base plates are disposed opposite to each other and spaced by a distance;
• and
• the active reset mechanism comprises two telescopic rods and reset springs, wherein each reset spring of the reset springs is sleeved on the two telescopic rods, each telescopic rod of the two telescopic rods is connected to an end portion of the reset springs to form a synchronous mechanism, and a first end of the each telescopic rod and a first end of the each reset spring are connected to one side of the two concave base plates and a second end of the each telescopic rod and a second end of the each reset spring are fixed at the top end position of the hydraulic support through a fixed support.