Food fresh-keeping packaging bag film blowing machine and method thereof

Abstract

The invention relates to a food fresh-keeping packaging bag film blowing machine and a method thereof, and relates to the technical field of plastic molding.The food fresh-keeping packaging bag film blowing machine comprises a rack, a hot melting system, an air blowing system, a bag body deflection system, a propeller strut device and two foam stabilizing frame devices, the propeller strut device is installed on the rack and located above the hot melting system, and all the foam stabilizing frame devices are hung on the lower side of the propeller strut device; the hot melting system is provided with an annular discharging port, the air blowing system is arranged in the middle of the annular discharging port and provided with an annular air outlet, the bag body deflection system comprises an air return pipe, a deflection control device, a plurality of shielding devices and an air return control frame, and the deflection control device is installed at the top of the air return pipe in a deflectable mode. The top of the deflection control device is communicated with the interior of the air return pipe, the air return control frame is installed on the outer side of the air return pipe, a plurality of air return holes are formed in the periphery of the air return pipe, the shielding devices are installed on the deflection control device, the shielding devices are in transmission connection with the deflection control device, and the shielding devices change the drift diameter of the air return holes and prevent the membrane material from deflecting.

Claims

1. A film blowing machine for food fresh-keeping packaging bags, characterized in that: The invention comprises a frame, a hot melt system, an air blast system, a bag body deflection system, an A-shaped frame device and two bubble stabilizing frame devices, wherein the hot melt system and the air blast system are both installed on the frame, the A-shaped frame device is installed on the frame and is located above the hot melt system, and each bubble stabilizing frame device is hung on the lower side of the A-shaped frame device, the hot melt system has an annular discharge port, the air blast system is in the middle of the annular discharge port and the air blast system has an annular air outlet, the bag body deflection system comprises a return air duct, a deflection control device, a plurality of shielding devices and a return air control frame, the deflection control device can be deflected and installed on the top of the return air duct, the The top of the deflection control device is connected to the interior of the return air duct, and the return air control frame is installed on the outside of the return air duct. A number of vertically arranged return air holes are provided around the return air duct. Each of the shielding devices is installed on the deflection control device. The shielding device is transmission-connected to the deflection control device. Each of the shielding devices changes the diameter of the return air hole. The shielding device includes a shielding strip and a hook plate. The hook plate is installed on the top of the shielding strip. The hook plate hooks the deflection control device. The shielding strip fits the return air duct and slides up and down along the preset slot of the return air duct. The shielding strip is an iron sheet with a counterweight installed at the bottom.

2. A film blowing machine for food fresh-keeping packaging bags according to claim 1, characterized in that: The air blowing system includes a plurality of air blowers, and each of the air blowers is connected to the annular air outlet through an air blowing pipe.

3. The film blowing machine for food fresh-keeping packaging bags according to claim 1, characterized in that: The herringbone device comprises a first bracket and a second bracket, wherein the first bracket and the second bracket are both rotatably mounted on the frame, and a plurality of transverse merging rollers are rotatably provided on the first bracket and the second bracket.

4. The film blowing machine for food fresh-keeping packaging bags according to claim 1, characterized in that: Each of the bubble stabilizing rack devices includes an upper merging rod, a lower merging rod, two clamping springs, two clamping connecting rods and a plurality of forward and backward merging rollers. The upper merging rod is installed on the upper end of the clamping connecting rod, and each of the forward and backward merging rollers is rotatably installed on the lower end of the merging lower rod. The merging lower rod is slidably installed on the clamping connecting rod. The two ends of the clamping spring are respectively pressed on the merging lower rod and the forward and backward merging rollers. The upper merging rod and the merging lower rod are clamped at the bottom of the herringbone frame device.

5. The film blowing machine for food fresh-keeping packaging bags according to claim 1, characterized in that: A deflection arc groove is provided on the top of the return air duct, and the deflection control device is slidably connected to the deflection arc groove. The center of gravity of the deflection control device is lower than the deflection arc groove, and the deflection control device is provided with a return air top hole connected to the return air duct.

6. The film blowing machine for food fresh-keeping packaging bags according to claim 1, characterized in that: The return air control frame includes a plurality of negative pressure vertical plates and a plurality of negative pressure horizontal plates, each of the negative pressure vertical plates is installed on the outer side wall of the return air duct, each of the negative pressure horizontal plates is installed between the upper ends and lower ends of adjacent negative pressure vertical plates, and each of the return air holes is located between the corresponding negative pressure vertical plates.

7. A method for blowing film for food fresh-keeping packaging bags, using the food fresh-keeping packaging bag film blowing machine as claimed in claim 1, characterized in that: The steps include: S1: The material is squeezed out from the outlet to 10 cm. When it is in a molten state, it is pressed against the return air duct and the air blowing system is activated to allow the annular air outlet to release air, causing the material to expand. S2: The materials are sequentially placed outside the bag body deflection system upwards, and are sequentially pulled between two bubble stabilizing rack devices and onto the herringbone rack device; S3: The blowing system continues to blow air. Due to the deflection of the bag body, the air flow velocity around the deflection control device is uneven, which in turn drives the deflection control device to deflect, causing the air flow of each return air hole to change, thereby attracting the bag body to correct its posture.

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