The structure of the filling machine varies depending on the filling method, but its main structures generally include: feeding device, bottle supply mechanism, bottle lifting mechanism, filling valve, etc.

Feeding device

1. Atmospheric pressure feeding device

This method of filling system is relatively simple. The liquid product is fed into the storage tank of the filling machine through a high-level tank or pump via an infusion tube. The storage liquid level is generally kept constant by a float type controller, but it can also be controlled by an electromagnetic valve. The fluid in the storage tank enters the container to be filled through the switch of the filling valve.

2. isobaric feeding device

The infusion manifold 2 is connected to the diversion head 9 at the top of the filling machine, and there are six infusion branch pipes 14 uniformly distributed at the lower end of the head, which are connected to the annular liquid storage tank 12. Before opening the infusion main valve 6, it is necessary to first apply hydraulic check valve 1 to adjust the liquid flow rate and determine its pressure level. After the pressure is adjusted, the main valve can be opened. The sterile compressed air tube is divided into two paths: one is the pre inflation tube 7, which is directly connected to the annular storage tank through a diversion head. Its function is to inflate the storage tank to generate a certain pressure before starting up, so as to prevent the liquid material from bubbling due to sudden pressure drop when entering the cylinder. When the infusion valve 6 is opened, the shut-off valve 4 should be closed. The other route is the balance air pipe 8, which is connected to the intake valve 11 connected to the high liquid level float 13 through a diversion head. Its function is to control the upper limit of the liquid level in the storage tank. When the gas volume decreases and the air pressure is too low, causing the liquid level to be too high, the high-level floating bubble rises and opens the intake valve. Aseptic compressed air enters the liquid storage tank to supplement the insufficient air pressure, resulting in a decrease in the liquid level. On the contrary, when the gas volume increases and the air pressure is too high, causing the liquid level to be too low, the low liquid level float 16 opens the vent valve 18, causing the liquid level to rise slightly. In this way, the air pressure inside the storage tank tends to stabilize, and the liquid level is basically stable in the middle of sight glass 17. Stop valve 5 is always in the open position.