Development of home miniature vacuum packaging machine

(1.Guangdong Provincial Agricultural Machinery Accreditation Station, Guangzhou 510515, China; 2. Guangzhou Yajunshi Electric Co., Ltd., Guangzhou, Guangdong 511442, a vacuum pump, does not produce soot, does not pollute the environment; the use of double-piston, effectively improve the vacuum; vacuum pump has three uses , respectively for vacuum, seal the vacuum chamber and push the heat sealing device to exercise.

0 Rumors Vacuum is in the specified space. Gas states below atmospheric pressure are collectively referred to as vacuum. The degree of gas thinness in a vacuum is called the degree of vacuum and is usually expressed as a pressure value. Vacuum packaging is the process of loading the material into the packaging bag, drawing out the air inside the packaging bag, and reaching the predetermined vacuum level to complete the sealing. The main role of vacuum packaging is to remove oxygen and help prevent the oxidation of the product. Because the deterioration of food is mainly caused by the activities of microorganisms, the survival of most microorganisms (such as molds and yeasts) requires oxygen. Vacuum packaging is the use of this principle to remove the oxygen in packaging bags and food cells, so that Microorganisms lose their living environment so as to achieve preservation. Experiments have proved that: When the oxygen concentration in the packaging bag vacuum packaging has the advantages of anti-oxidation, water, moisture, preservation and prolong the product shelf life, it is widely used in the food industry. The vacuum packaging machine used in the food industry is basically a chamber vacuum packaging machine. This type of vacuum packaging machine needs a relatively large vacuum chamber. The vacuum bag containing the material needs to be placed in a vacuum chamber and then the vacuum chamber. Vacuum. Therefore, the size of this type of machine is generally larger.

With the development of society and the improvement of people’s living standards, people’s requirements for food safety are getting higher and higher, and vacuum preservation technology is gradually being developed for home use. However, existing industrial vacuum packaging machines are bulky, expensive, and limited by the size of the vacuum chamber, and cannot be vacuumed against a large vacuum bag in a vacuum chamber.

1 Design goals and requirements Because this machine is for home users, it has the following design goals and requirements: It has strong applicability, and it can use different specifications of vacuum bags as far as possible; minimize the fume pollution of vacuum pumps.

2 Structure and working principle 2.1 Structure The household miniature vacuum packaging machine is mainly composed of shell, motor, vacuum pump, vacuum chamber, sealing ring, hot-press sealing device, piston cylinder, control system and other components. See.

1 piston type cylinder A; 2 upper vacuum chamber; 3 lower vacuum chamber; 4 pressure sensor; 5 pressure gauge; 6 solenoid valve A; 7 solenoid valve B; 8 vacuum pump A; 9 vacuum pump B; 10 solenoid valve C; 11 electromagnetic Valve D; 12 piston cylinder B; 13 hot-press sealing device; 14 vacuum bag; 15, food; 16 rubber foam sealing ring Miniature vacuum packaging machine schematic diagram In order to achieve the design goals and requirements, this institution abandoned industrial applications The structure of the wide chamber vacuum packaging machine and the oil seal vacuum pump are in the form of an externally pumped vacuum packing machine and a small double piston oilless vacuum pump.

The control system adopts a single-chip computer to control the various electrical components. The LCD screen and the vacuum gauge show the modern agricultural equipment to indicate the working status, which is convenient for home users.

2.2 Working principle Through the program control of the MCU, the motor rotates and the vacuum pump works. First, the channel where the solenoid valve B is located is opened, and the piston cylinder A is formed into a vacuum state so as to push the upper vacuum chamber downward and form a closed space with the lower vacuum chamber and the vacuum bag. Then close the solenoid valve B and keep the upper and lower vacuum chambers sealed.

The second step is to open the channel in which the solenoid valve A is located. The vacuum pump evacuates the sealed space formed by the upper and lower vacuum chambers and the vacuum bag, and the air in the vacuum bag and the vacuum chamber is drawn out. When the vacuum reaches our predetermined vacuum value, the pressure sensor works and feeds back to the control system, and then instructs the solenoid valve A to close its channel.

The third step is to open the channel where the solenoid valve D is located. The vacuum pump evacuates the piston cylinder B to push the hot-press sealing device upwards, compress the vacuum bag, and start heating. After the vacuum bag heat seal is completed, heat is stopped.

In the fourth step, the vacuum pump stops working, and then the channels of all the solenoid valves are opened. Outside air enters all the pipes of the entire machine through the channel where the solenoid valve C is located. The vacuum state of the vacuum chamber, the piston cylinder A and the piston cylinder B is released, and the heat is removed. The pressure seal device and upper vacuum chamber return to their original positions.

The fifth step, remove the vacuum bag, vacuum packaging work is completed.

3 Design and Selection of Main Components 3.1 Vacuum Chamber This mechanism is an external pumping vacuum packaging machine. When it is working, it only needs to put the vacuum bag into the vacuum chamber for vacuuming. The length of the vacuum bag is not limited. Can hold more material.

The volume of the vacuum chamber of the vacuum packaging machine is only about 1/40 of the volume of the vacuum chamber of the chamber vacuum packaging machine of the same specification. Then, under the same vacuum condition, the pressure applied to the chamber is less than that of the chamber vacuum packaging machine. Therefore, a lightweight polycarbonate plastic is selected as the material of the vacuum chamber and the housing. Therefore, the overall mass and volume of this institution are smaller than those of chamber-type vacuum packaging machines.

3.2 Vacuum Chestnut and Motor This vacuum packaging machine vacuums the air in the vacuum bag during the entire process of vacuuming the vacuum bag. Under the action of the external atmospheric pressure, the vacuum bag is gradually flattened until it is tightly attached to the food. The vacuum capacity of the vacuum pump is basically the same as that of the vacuum chamber and the vacuum bag.

Industrial vacuum vacuum packaging machine in the process of vacuum, because the vacuum bag is placed in the vacuum chamber, vacuum bag and vacuum chamber vacuum is the same, so the vacuum bag will not be gradually flattened, and After the heat seal is completed, the vacuum bag is crushed and tightly adhered to the food under the action of external atmospheric pressure.

After experiments and verification, the vacuum capacity of the vacuum pumping chamber of the chamber-type vacuum packaging machine reaches 1.33 kPa, and the vacuum degree in the vacuum bag after being evacuated can generally only reach about 8 kPa (depending on the size of the space in the vacuum bag before food is vacuumed. And then).

Therefore, the packaging effect of the vacuum packaging machine using a vacuum pump with a vacuum capacity of 8 kPa and a vacuum pumping machine with a vacuum pump with a vacuum capacity of 1.33 kPa is basically the same.

In addition, the vacuum packaging machine is mainly for home users, and the home user uses the feature that the use frequency is relatively low, and the pollution of the fumes produced by the vacuum pump is high.

Combining the above two conditions, during the design process, we abandoned the commonly used vacuum vacuum packaging machine with high vacuum capacity, but the oil seal pollution of the vacuum pump, but using a dual-piston oil-free vacuum pump with a special custom DC Motor, see. The vacuum packaging machine uses a motor to drive two vacuum pumps and has a compact structure. In addition, the exhaust port of the vacuum pump B and the intake port of the vacuum pump A are connected in series via a pipe, effectively improving the overall vacuum capability. After experimental verification, the vacuum capacity reached 8kPa. The same specification of a single vacuum pump or two vacuum pumps not connected in series work, the vacuum degree is only 23kPa. 1. Vacuum pump B; 2. Vacuum pump B inlet; 3. Vacuum pump B Exhaust port; 4. Air inlet of vacuum pump A; 5. Exhaust port of vacuum pump A; 6. Vacuum pump A; 7. Intake pipe of vacuum pump B; 8. Vacuum pump physical concluding statement of DC motor micro vacuum packaging machine Small size, cheap, easy to use, no smoke pollution, can adapt to different lengths of vacuum bag vacuum, in line with the intended design goals and requirements, there will be a great market and promotion prospects.

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