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From the packaging angle to the material can be divided into liquid filling machine, paste filling machine, powder filling machine, particle filling machine, etc.; from the degree of automation of production, it can be divided into semi-automatic filling machine and automatic filling production line. From the gas content of the filling material, it can be divided into the isobaric filling machine, the constant pressure filling machine and the negative pressure filling machine. (1) isobaric filling machine isobaric filling machine is generally in the storage tank to maintain a certain amount of filling pressure, when the container into the filling machine, first inflatable the container, gas can be compressed air, carbon dioxide gas, and carbon dioxide gas is good. When the pressure in the container is consistent with the pressure of the storage tank, that is, the gravity of the feed liquid is filled through the opened filling valve. During the filling process, the gas in the container should be smoothly exported to the storage tank or the gas chamber. In the filling of soft drinks, small champagne and beer, most of them are made by isobaric filling. The process is as follows: (1) at the initial location, the bottle has not yet touched the filling valve, and all the gas and liquid passages are closed. (2) the inflatable pressure bottle and the filling valve cover are up to the predetermined position, when the turning fork opens the inflatable valve, and the pressure gas enters the bottle through the inflatable channel from the annular storage tank. (3) when the pressure of the injection into the bottle reaches the pressure of the storage cylinder, the liquid valve opens automatically. The liquid must be flowing down the wall of the bottle by the split parachute. At the same time, the pressure gas which is replaced in the bottle returns to the injection cylinder through the return pipe, and the liquid is finished when the liquid surface reaches the lower port of the return pipe. (4) the valve closes the rotary fork to close the pressure gas valve and the liquid valve. (5) inflatable top carbon dioxide valve opens, carbon dioxide or other inert gas is filled into the bottle from the annular groove, and the air is removed from the bottleneck. (6) the pressure release pressure release valve opens, and the pressure in the bottle passes through the needle valve in the pressure release channel and escapes to the annular groove. (two) normal pressure filling machine A lot of drinks, if juice, milk drinks, and soda syrup two filling syrup, they do not contain carbon dioxide, generally use atmospheric filling machine. The normal pressure filling machine is mainly composed of filling system, import and export mechanism, lifting bottle mechanism, worktable, transmission system and so on. It is used for filling liquid without gas. This kind of filling machine is usually rotary. Under the action of the transmission system, the rotating shaft drives the turntable and the quantitative cup to rotate together, and the liquid material flows into the quantitative cup from the storage barrel through the pipeline. The bottle support drives the bottle to rise under the action of the cam. When the cap is raised, the spring is compressed, and the slide valve slides upward in the inner hole of the moving measuring cup. With the rotation of the rotary shaft, the well-defined measuring cup has been turned off from the feeding pipe and into the filling position. When the slide valve rises, the liquid will flow into the bottle when the inlet hole is opened, and the gas in the bottle is discharged from four small grooves on the surface of the cover plate to complete the filling task of a bottle. With the rotation of the turntable, quantitative cups are entered directly below the quantitative cup. When the quantitative position is removed, the filling position begins to fill the bottle again, so it works repeatedly and continuously. (three) negative pressure filling machine It is often called a vacuum filling machine. This kind of filling method is to make the storage box in the normal pressure, in filling, only in the bottle to form a vacuum in the bottle, to a certain degree of vacuum, the liquid depends on the pressure difference between the liquid box and the container into the bottle and complete the filling. It is mainly used for liquid filling without gas, if it is juice. Because it is filled in vacuum, the filling can be stopped when the bottle is broken, and the loss can be reduced. But in vacuum, some aromatic liquids are to be lost. The negative pressure filling method is more strict for the bottle specification, because the quantity of the bottle is determined by the depth of the filling nozzle into the bottle, and the volume of the bottle directly affects the quantitative accuracy. But because of easy adjustment, it is still widely used.
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