Abstract: A variable-diameter full-support mandrel structure with a slider-type cross section for preventing a reverse rotation of a ratchet wheel includes a movable mandrel segment and a straight shank, and the movable mandrel segment and the straight shank are connected through a quick-disconnect universal joint. A rotating shaft of the movable mandrel segment is provided with a connecting rod mounting flange, a ratchet wheel, a reverse ratchet wheel, a bearing, and a limit clamp ring in sequence. An outer ring of the bearing is provided with a pawl mounting frame. The connecting rod mounting flange and the pawl mounting frame are respectively hinged to a long connecting rod and a short connecting rod, and the long connecting rod and the short connecting rod are hinged to slider components in an outer ring. The slider component has a Z-shaped structure composed of two layers of arc blocks.

Abstract: An elastic double-support variable-diameter mandrel for bending of an aircraft engine-specific metal conduit includes a frame receiving pipe, an elastic outer frame and an inner hydraulic component. In the inner hydraulic component, an inner chamber of an elastic membrane is filled with a liquid, a tail end of the elastic membrane is provided with an opening, the opening communicates with a first end of a liquid delivery pipe through a pipe joint, and a second end of the liquid delivery pipe is connected to an external hydraulic system. The elastic outer frame is a flexible single unit composed of a tie rod and an elastic mesh structure. The tie rod includes an elastic traction segment, a straight segment and a pull ring. The elastic mesh structure includes wavy metal strip circumferences and anti-fatigue elastic connectors. The frame receiving pipe is sleeved outside the elastic outer frame/inner hydraulic component.

Abstract: A variable-diameter full-support mandrel structure with a slider-type cross section for preventing a reverse rotation of a ratchet wheel includes a movable mandrel segment and a straight shank, and the movable mandrel segment and the straight shank are connected through a quick-disconnect universal joint. A rotating shaft of the movable mandrel segment is provided with a connecting rod mounting flange, a ratchet wheel, a reverse ratchet wheel, a bearing, and a limit clamp ring in sequence. An outer ring of the bearing is provided with a pawl mounting frame. The connecting rod mounting flange and the pawl mounting frame are respectively hinged to a long connecting rod and a short connecting rod, and the long connecting rod and the short connecting rod are hinged to slider components in an outer ring. The slider component has a Z-shaped structure composed of two layers of arc blocks.

Abstract: An elastic double-support variable-diameter mandrel for bending of an aircraft engine-specific metal conduit includes a frame receiving pipe, an elastic outer frame and an inner hydraulic component. In the inner hydraulic component, an inner chamber of an elastic membrane is filled with a liquid, a tail end of the elastic membrane is provided with an opening, the opening communicates with a first end of a liquid delivery pipe through a pipe joint, and a second end of the liquid delivery pipe is connected to an external hydraulic system. The elastic outer frame is a flexible single unit composed of a tie rod and an elastic mesh structure. The tie rod includes an elastic traction segment, a straight segment and a pull ring. The elastic mesh structure includes wavy metal strip circumferences and anti-fatigue elastic connectors. The frame receiving pipe is sleeved outside the elastic outer frame/inner hydraulic component.