Solar trough mirror frame, rolling rib, roller, cleaning apparatus and method

A method for moving a frame supporting solar mirrors of a solar trough system comprising the steps of:

• moving the frame on a roller guided by a rib engaged with the roller and attached to the frame bottom at other than either end of the frame to a first position, the rib having a top flange and a bottom flange in spaced relation to the top flange, the rib having a first end and a second end, the bottom flange having top surfaces which are angled to allow dust and debris to slide off;
• and moving the frame on the roller guided by the rib engaged with the roller and attached to the frame bottom to a second position, the first end and the second end of the rib move up or down as the rib moves.

A roller assembly for engaging with a rib attached to a frame underneath the frame at other than either end of the frame that holds mirrors of a solar trough system comprising:

• a housing which receives the rib, the rib having a top flange and a bottom flange in spaced relation to the top flange, the rib having a first end and a second end;
• and a first roller disposed in the housing on which the rib moves when the frame moves, the first end and the second end of the rib move up or down as the rib moves.

A rib for a frame that holds solar mirrors of a solar trough system which engages with a roller comprises:

• a profile having a first end and a second end, a top portion that attaches to the frame underneath the frame at other than either end of the frame, a central portion extending from the top portion and a bottom portion that engages with the roller, the bottom portion having top surfaces which are angled to allow dust and debris to slide off, the rib moving along the roller as the frame moves, the first end and the second end of the profile move up or down as the rib moves.