Bubble stabilizing device with expansion ring

The invention discloses an expansion ring bubble stabilizing device with an expansion ring, and the device provided by the invention relates to a bubble stabilizing device, and is mainly used for solving the problem that the existing bubble stabilizing device can not be controlled accurately, can not be expanded and can not guarantee the circular degree of a bubble. The expansion ring bubble stabilizing device comprises a bubble stabilizing platform, an electric motor, a speed reducer, bubble stabilizing frames and the expansion ring, wherein the electric motor is connected with the speed reducer by virtue of a V-shaped belt; the bubble stabilizing frame comprises two linear bearings which are arranged in parallel and are provided with optical axes, and the linear bearings are fixed on the bubble stabilizing platform; a support is fixed at the tails of the optical axes of the linear bearings, and an arc-shaped bubble stabilizing plate is fixed on the support by virtue of bolts; a plurality of bubble stabilizing frames are uniformly fixed on the bubble stabilizing platform, the bubble stabilizing frames are arranged at the same circumference and connected by virtue of the expansion ring, and one of the bubble stabilizing frames is connected with the speed reducer. In the invention, the bubble stabilizing plates are distributed uniformly at the circumference of the bubble, and the central point of each pair of optical axes is aligned with the centre of the bubble, thereby ensuring that all the bubble stabilizing plates are always the tangents of circles (with same radiuses) of the bubble in the process of expansion motion; and because the moving of all the bubble stabilizing frames is driven by the expansion ring, the bubble stabilizing device can be controlled accurately, and the size of the bubble stabilizing device can be adjusted, therefore, the bubble stabilizing device can be used for stabilizing the bubble of a blown film more precisely.