Device for sliding lid on a drilling mud container

A drilling mud container of plates with vertical and horizontal profiles forming a frame, the drilling-mud container comprising:

• a sliding lid with an open position and a closed position;
• a sliding track wherein the sliding lid moves along the sliding track;
• an opening mechanism having a toothed wheel wherein the opening mechanism moves the sliding lid;
• a hinged service hatch having an open position and a closed position wherein the opening mechanism is operable with the hinged service hatch in the open position and in the closed position;
• an abutment portion connected to the frame;
• and
• a pitch rack connected to the sliding lid, the pitch rack having an end portion wherein the end portion is inclined in the direction of the toothed wheel and further wherein the end portion abuts against the toothed wheel when the sliding lid is in the closed position causing the sliding lid to be displaced in a vertical direction and seal against the abutment portion;
• wherein the opening mechanism is operable when the hinged service hatch is in the closed position.