In the production and packaging of various liquid products, the piston filling machine is a powerful “assistant”. Its working principle is ingenious and efficient.
The core components of the piston filling machine are the piston and the cylinder. When working, the piston reciprocates in the cylinder. Let’s look at the liquid suction process first. When the piston is pulled outward, the space in the cylinder becomes larger, the pressure decreases, and a vacuum state is formed. At this time, the external atmospheric pressure “presses” the liquid in the storage tank into the cylinder through the liquid inlet pipe and the one-way valve. Just like sucking a drink with a straw, the pressure decreases after the air in the straw is sucked out, and the drink is sent into the straw by atmospheric pressure.
Then comes the liquid filling link. The piston begins to push inward, the liquid in the cylinder is squeezed, and the pressure increases. The liquid follows the liquid outlet pipe, pushes open the liquid outlet one-way valve, and is accurately injected into the container below waiting for filling. The length of the piston movement directly determines the amount of filling liquid. For example, the longer the piston stroke, the more liquid is pushed out; the shorter the stroke, the less filling volume. The advanced piston filling machine is also equipped with an electronic control system that can accurately control the piston stroke, so that the error of each filling amount is extremely small, ensuring stable product quality.
The one-way valve plays a key role in the entire working process. The inlet one-way valve only allows liquid to flow into the cylinder to prevent the liquid from flowing back into the storage tank; the outlet one-way valve only allows the liquid in the cylinder to flow to the filling container to prevent the liquid in the container from flowing back. With such a simple but exquisite design, the piston filling machine can complete the liquid filling task efficiently and accurately. It is widely used in many industries such as food, medicine, and cosmetics, providing all kinds of beautifully packaged liquid products for our daily life.
