Upper traction rotating device of blown film equipment

Abstract

The invention discloses a draught rotation device on blown film device. The device has a single primary spindle on the top beam of the fixing frame vertically, there arranges a draught bracket hook and pendulum roller hook with C structure under the primary spindle. The whole draught mechanism is suspended on the draught hook, the pendulum is suspended on the hook, and the pendulum roller is above the draught bracket, at the same time, it uses a rotation motor and ití»s gearing part to drive the draught bracket hook and pendulum hook to rotate around the spindle center of the primary spindle. The angle of the draught bracket hook is from plus and minus 45deg.C to plus and minus 90deg.C; the pendulum angle of the roller hook is 1 / 2 of the pendulum angle of the hook. The film foam blown by the blown device is pressed into film, the structure is simple.

Description

technical field [0001] The invention relates to a film traction device of blown film equipment, in particular to an upper traction rotating device of blown film equipment. Background technique [0002] The plastic film produced by ordinary up-blown blown film equipment is often uneven in transverse thickness, and it is easy to produce defects such as large and small ends, elastic edges, ribs or grooves when the film is rolled, resulting in poor film winding quality. The usual improvement method is to rotate the die head of the blown film equipment relative to the upper traction frame, and distribute the thick and thin points of the film during winding to improve its winding quality. However, for blown film equipment with multi-layer dies, the more layers of dies, the greater the error accumulated in processing, and it is more and more difficult to meet its precision requirements and make it rotate, even impossible. At the same time, the parts and seals...

AI Technical Summary

Problems solved by technology

The traction frame of the track-type upper traction and rotation device is installed on a large-diameter disc, which rotates and swings at ±170°, and uses multi-roller turning. The concentricity of the disc rotation needs to be controlled by multi-point adjustment, and this adjustment It is the adjustment of equipment installation, and its precision is very different from that of equipment processing, so its structure is more complicated, processing is more difficult, and the rotation accuracy is not easy to guarantee

At the same time, the path of the film is constantly stretched and changed during the operation of the multi-swing rollers, resulting in continuous changes in the linear speed of the film winding, so its rotation speed is unstable, prone to jitter, and the film is also prone to stretching and deformation, resulting in the quality of the film winding. decline

Several flattening rollers of the enveloping upper traction and rotating device are installed vertically on the periphery of the large-diameter disc. During the rotation and swing of the disc, there are two stages of film storage and release. In the storage stage, the winding speed of the film changes. Slow, while the winding speed of the film becomes faster in the release stage, which leads to local stretching or relaxation of the film, which also affects the quality of film winding

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