Patent ID: 9579849
Date: 2017-02-28
CPC Classifications: B29C,G02B

Claim:
1. A hole expanding device, comprising: an electric heating device comprising a hole expanding rod; a moving device; a rotating device fixed onto the moving device; and a carrying device fixed onto the rotating device, and comprising a receiving groove configured to fix and receive a workpiece; wherein the electric heating device is configured to heat the hole expanding rod to a predetermined temperature; the moving device drives the rotating device toward the hole expanding rod; the rotating device rotates the carrying device, and makes two opposite surfaces of the workpiece respectively move toward the hole expanding rod; wherein the carrying device comprises a carrying platform; the carrying platform includes an upper surface and an opposite lower surface; one side of the carrying platform is connected to and fixed with the rotating plate; the upper surface defines a receiving groove, and the lower surface defines a through hole that extends through a bottom of the receiving groove; and wherein the carrying device comprises a holding piece is rotatably fixed on the upper surface by a screw, the holding piece is rotated to cover a top of the receiving groove so as to restrict the workpiece in the receiving groove.