Control method of high pressure gas for blowing bottle

Abstract

The invention discloses a control method of high pressure gas for blowing a bottle. A valve group control mechanism is applied, and the output end of a fore-blow check valve group in the valve group control mechanism is provided with a fore-blow check valve; the output end of an intermediate blow valve group in the valve group control mechanism is provided with an intermediate blow check valve; the control method comprises the step I of controlling a fore-blow valve group to close, and fore blowing the high pressure gas for preforming a bottle perform, wherein the pressure of the fore blown high pressure gas is 4-12 bar; the step II of controlling the intermediate blow valve group to close, controlling the fore blow valve group to open after 0.02-0.2s, and intermediately blowing the high pressure gas for sizing the bottle perform, wherein the pressure of the intermediately blown high pressure gas is 15-20 bar; the step III of controlling a secondary blow valve group to close, controlling the intermediate blow valve group to open after 0.02-0.2s, secondarily blowing the high pressure gas for sizing the bottle perform, wherein the pressure of the secondarily blown high pressure gas is 25-35 bar; and the step IV of controlling an exhaust valve group to close for discharging the gas in the bottle. The control method has the advantages that the forming quality of the bottle performcan be improved greatly, an the thickness requirements of the bottle perform are reduced greatly, so that the blowing cost of the bottle perform can be reduced.

Description

technical field [0001] The invention relates to the technical field of bottle blowing machines, in particular to a control method for bottle blowing high-pressure gas. Background technique [0002] During bottle blowing, high-pressure gas is introduced into the preform after the preform is heated and softened in the mold, and the high-pressure gas makes the preform expand to shape. It can be seen that the control of high-pressure gas directly affects the preform molding. The traditional valve group mechanism for controlling high-pressure gas includes: pre-blowing valve group, intermediate blowing valve group, secondary blowing valve group, exhaust valve group, the input end of the pre-blowing valve group and the pre-blowing station that provides pre-blowing high-pressure gas The input end of the middle blowing valve group is connected with the middle blowing station that provides the middle blowing high-pressure gas, the input end of the second blowing valve group is connec...

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Problems solved by technology

[0003] The traditional high-pressure gas control method has the following defects: during the switching process between the pre-blowing valve group and the intermediate blowing valve group, and during the switching process between the intermediate blowing valve group and the second blowing valve group, there will be a 10 millisecond interval, Each interval will make the pressure in the preform smaller, such as figure 1 As shown, at t1, that is, the switching node of the pre-blowing valve group and the intermediate blowing valve group, and at t2, that is, the switching node of the intermediate blowing valve group and the second blowing valve group, the pressure in the preform decreases significantly

Reduced pressure inside the preform will seriously affect the molding quality of sharp-edged bottles

For example, in order to eliminate the intermittent, delay the closing time of the pre-blowing valve group during the switching process of the pre-blowing valve group and the intermediate blowing valve group, or delay the closing time of the intermediate blowing valve group during the switching process of the intermediate blowing valve group and the second blowing valve group. This will lead to the gas blow-by phenomenon that the middle-blowing high-pressure gas enters the pre-blowing high-pressure gas, and the second-blowing high-pressure gas enters the middle-blowing high-pressure gas, resulting in the pressure of the high-pressure gas corresponding to the pre-blowing valve group and the middle blowing valve group If it is too large, it will cause a series of bad phenomena, and then make the bottle molding effect poor

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