Abstract: An internal-cooling rolling tool capable of realizing variable-angle low-temperature lubrication is provided. The internal-cooling rolling tool includes a tool handle, a rotatable tool head and a medium conveying tube. The rotatable tool head includes a base, a rolling head and a ball. The bottom end of the base is mounted on the tool handle, and the top of the base is provided with a medium input port connected with the medium conveying tube. The rolling head is detachably mounted on the front end surface of the base, and the front end surface of base is provided with a plurality of spray holes in the circumferential direction of the rolling head. The medium conveying tube communicates with the spray holes through a medium flow channel. The ball is mounted on one end of the rolling head facing away from the base.

Abstract: A portable electronic device includes a host module, a display module, a pivoting structure connected to the host module and the display module and a supporting structure connected to the display module for supporting the display module on a supporting surface. The supporting structure includes a supporting portion for contacting against the supporting surface and two supporting rods. Two ends of the two supporting rods are connected to two ends of the supporting portion respectively, and the other ends of each rod are rotatably connected to two side portions of the display module respectively, so that the supporting structure rotates relative to the display module. A sliding slot is formed on the other end of each supporting rod, and parts of the two side portions of the display module are installed inside the two sliding slots, so that the two supporting rods move relative to the display module.

Abstract: A portable electronic device includes a host module, a display module, a pivoting structure connected to the host module and the display module and a supporting structure connected to the display module for supporting the display module on a supporting surface. The supporting structure includes a supporting portion for contacting against the supporting surface and two supporting rods. Two ends of the two supporting rods are connected to two ends of the supporting portion respectively, and the other ends of each rod are rotatably connected to two side portions of the display module respectively, so that the supporting structure rotates relative to the display module. A sliding slot is formed on the other end of each supporting rod, and the two side portions of the display module are installed inside the two sliding slots, so that the two supporting rods move relative to the display module.