Accurate measuring and controlling equipment and accurate measuring and controlling method for film bubble blowing and condensation form

Abstract

The invention provides accurate measuring and controlling equipment for film bubble blowing and condensation form. The equipment comprises an extrusion die head, wherein a cooling air ring is arrangedon the upper surface of the extrusion die head, and two cameras are fixedly installed above the cooling air ring; the orientation of the first camera is horizontal and longitudinal, the orientation of the second camera is horizontal and transversal, an upright first background board is further arranged in the front direction of the first camera, and an upright second background board is further arranged in the front direction of the second camera; a first vertical reference line and a first reference point which can be shot by the first camera and identified by a central controller are arranged on the first background board, and a second vertical reference line and a second reference point which can be shot by the second camera and identified by the central controller are arranged on thesecond background board; and four upright air suction plates are arranged beside a film bubble moving track. The invention further provides an accurate measurement and control method for film bubble blowing and condensation form. According to the accurate measuring and controlling equipment for the film bubble blowing and condensation form, the diameter of a film bubble, the condensation speed ofthe film bubble and the horizontal shaking degree of the film bubble can be accurately measured and controlled.

Description

technical field [0001] The invention belongs to the technical field of plastic film production, and in particular relates to a precise measurement and control device and a precise measurement and control method for the expansion and condensation form of film bubbles. Background technique [0002] Plastic film can be produced by plastic blown film equipment. figure 1 As shown, the conventional film blowing equipment includes an extrusion die head 1, the extrusion die head is provided with a circular extrusion port 10, and a cooling air ring 11 is provided near the top of the extrusion die head 1, and the extrusion die head 1 is also equipped with An air inlet duct 12 and an air outlet duct 13 are provided, the air inlet duct is connected with a blower 14, and the air outlet duct is connected with an exhaust fan 15, and the inner end 120 of the air inlet duct and the inner end 130 of the air outlet duct are respectively opened in the extruder. Exit the central area of ​​the u...

AI Technical Summary

Problems solved by technology

In the existing technology, the position of the condensation line of the film bubble mainly depends on the workers' visual inspection and experience judgment, and adjusts accordingly. Since the judgment process is relatively rough, the control of the condensation speed of the film bubble (that is, the condensation process) is not fine enough, and the control is automatic. low level

[0009] 3. The horizontal deviation or shaking degree of the vertical running process of the film bubble

When working, each stabilizing roller on the same layer surrounds the bubble in the center, and when the horizontal deflection of the bubble reaches a certain level, the bubble will touch the stabilizing roller and will not deviate further, thus limiting the swaying range of the bubble

However, the above-mentioned measures relying on the bubble stabilizer to limit the horizontal sloshing range of the bubbles have the following disadvantages: (1), the regulation method is a passive control, that is, the stabilizing roller will only take effect when the bubbles deviate to a certain extent; (2), When the film bubble touches the stabilizing roller, although the stabilizing roller can rotate to reduce the friction with the surface of the film bubble, the driving force of the stabilizing roller’s rotation must also come from the friction of the film bubble running vertically, according to the force and reaction The principle of force, the reaction force of the above-mentioned rubbing force is the force exerted by the stabilizing roller on the surface of the bubble. Due to the pulling force of the stabilizing roller on the surface of the bubble, it may also cause the thin and immature bubble to be strained or scratched. hurt

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