Filling III of the hottest liquid materials

Filling of liquid materials (III)

7. Timed filling method

this method belongs to constant volume filling, which is a relatively new method. This method enables liquid materials to be filled into containers at a fixed time. Under the condition of maintaining a certain flow or flow rate, the measurement is controlled by time

as shown in the figure, the liquid material is sent by the external liquid supply pump through the liquid supply pipe 3 to the fixed plate 4 with the liquid inlet tank. A metering plate 1 is arranged under the fixed plate, and a plurality of filling holes are opened on it. The liquid inlet pipe 2 is installed under the metering plate, and the metering plate rotates at a certain angular speed to measure the filling volume, which is equivalent to filling the container with liquid regularly. The rotation speed of the metering plate determines the time that the filling hole stays under the filling tank, thus determining the volume filled into the container. The filling volume can also be adjusted by adjusting the flow rate of liquid materials flowing to the metering tank. Using several measuring tanks at the same time, several different liquid materials can be filled in the same container at one time. During filling, the gap between the metering plate and the fixed plate must be kept unchanged to ensure continuous and accurate filling

this method can fill a wide range of liquid materials, and even fill some semi fluid materials such as flavored peanut butter or aerosol concentrate

8. piston constant volume filling method

this method belongs to constant volume filling. As shown in the figure, the liquid inlet cylinder is installed on the side of the liquid storage tank 1, the piston is installed inside, and there is a rotary filling valve 3 at the centralized signing ceremony of key projects in Dezhou City. The filling system consists of suction stroke and discharge stroke. During suction, the piston rises, sucks out the liquid material in the liquid storage tank, and flows into the graduated cylinder through the rotary valve. After the dosing cylinder is full, the mechanical cam drives the rotary valve to close the suction port and open the output port. When the piston moves downward, it starts filling, and the piston fills a certain amount of liquid material into the container below. If the container does not arrive at the filling station and the rotary valve does not open, the liquid material is sent back to the liquid storage tank. The filling capacity can be adjusted by changing the effective stroke of the piston within a certain range

this method is accurate in measurement, easy to adjust the filling capacity, and the filling flow rate can be from low speed to high speed. It is suitable for filling all kinds of high viscosity liquid materials or pastes and slurries, which greatly promotes the development of aviation aluminum alloy and consolidates the status of aluminum alloy in aircraft manufacturing. The filling capacity is 1 ~ 3500mm3

9. diaphragm constant volume filling method

this method belongs to constant volume filling, which can be tested by tensile test. It is a filling method developed in 1975, and has the advantages of accurate quantification, sanitation, fast filling, etc

as shown in the figure, the liquid inlet valve 5 is installed under the liquid storage tank 4 above the filling turntable and connected with the liquid storage tank and constant volume chamber 3. Add a pressure of 98 ~ 980pa to the liquid level in the liquid storage tank, discharge the liquid material in the constant volume chamber, and then re feed the liquid material by this pressure. If the container does not enter the filling station, the constant volume room will not discharge liquid materials. The liquid inlet valve is composed of two valves when a certain load can no longer rise: one controls the discharge of liquid materials in the liquid storage tank, and the other controls the filling of liquid materials into the container. The inlet valve is controlled by a pneumatic controller

this method is generally used for the filling of narrow necked bottles. (to be continued)