A vacuum packaging machine

Abstract

This utility model relates to a vacuum packaging machine with improved heat sealing effect. This vacuum packaging machine includes a base and a vacuum heat sealing device. The vacuum heat sealing device includes a vacuum chamber and a heat sealing mechanism. The vacuum chamber includes a fixed chamber and a movable chamber. The heat sealing mechanism includes a fixed heat sealing mold and a movable heat sealing mold. The fixed heat sealing mold is installed in the fixed chamber, and the movable heat sealing mold is installed in the movable chamber. The movable chamber is connected to a power source that drives its movement. The movable heat sealing mold is connected to a telescopic rod, which is slidably mounted on the movable chamber. A push plate is connected to the other end of the telescopic rod. A return spring is provided between the push plate and the movable chamber. A sealing plate is connected to the outside of the movable chamber. An elastic membrane is connected between the sealing plate and the movable chamber, and an air cavity exists between the elastic membrane and the sealing plate. This vacuum packaging machine uses an air bladder to push the heat sealing mechanism to heat-press the bag, resulting in more even heat pressure on the bag and a better heat sealing effect at the bag opening.

Description

Technical Field

[0001] This utility model relates to a packaging machine, specifically a vacuum packaging machine for vacuum packaging food. Background Technology

[0002] Vacuum packaging machines, as key equipment in the food preservation field, achieve the sealing of packaging bags through vacuuming and heat sealing processes. Existing equipment typically consists of a vacuum chamber and a heat sealing mechanism: after the vacuum chamber closes, vacuuming is completed, and then the cylinder of the heat sealing mechanism drives the heat sealing mold to press down and seal the bag opening. However, cylinder-driven heat sealing mechanisms have significant reliability issues: 1. Wear of sealing elements: The rubber sealing ring of the cylinder piston is prone to aging and cracking due to long-term high-frequency movement, leading to air pressure leakage, reduced driving capacity, or even failure. 2. Lubrication failure: Dust or food residue enters the cylinder, contaminating the lubricating grease, increasing friction between the piston rod and the cylinder body, and causing jamming. 3. Mechanical impact: The impact force of the instantaneous downward pressure of the heat sealing mold is transmitted to the cylinder's fixed structure, leading to loosening of connecting parts or deformation of the cylinder body over long-term use. 4. Poor heat sealing effect: The heat sealing mold is generally long and is driven by only one cylinder. The stress point of the heat sealing mold is concentrated at only one point. Due to the uneven pressure applied by the heat sealing mold, the heat sealing effect becomes poor. If the number of cylinders is increased, not only will the cost increase, but it will also be difficult to control the consistency of pressure applied by all cylinders, and the heat sealing effect will be difficult to guarantee. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, this utility model innovatively provides a vacuum packaging machine with a more stable structure and better heat sealing effect.

[0004] This vacuum packaging machine includes a base and a vacuum heat sealing device. The vacuum heat sealing device includes a vacuum chamber and a heat sealing mechanism. The vacuum chamber includes a fixed chamber and a movable chamber. The heat sealing mechanism includes a fixed heat sealing mold and a movable heat sealing mold. The fixed heat sealing mold is installed in the fixed chamber, and the movable heat sealing mold is installed in the movable chamber. The movable chamber is connected to a power source that drives the movable chamber to move. The movable heat sealing mold is connected to a telescopic rod, which is slidably mounted on the movable chamber. A push plate is connected to the other end of the telescopic rod. The outer side of the movable chamber has a space for the push plate to move back and forth. A return spring is provided between the push plate and the movable chamber. A sealing plate is connected to the outer side of the movable chamber. An elastic membrane is connected between the sealing plate and the movable chamber. The elastic membrane is connected to the outer side of the push plate. An air cavity is formed between the elastic membrane and the sealing plate. A vent connector for connecting to an air source is provided on the sealing plate, and the vent connector communicates with the air cavity.

[0005] The movable housing is equipped with a bag clamping mechanism, which includes a fixed clamp, a movable clamp, and a bag clamping power source. The fixed clamp is located below the movable heat sealing mold. A rotatable shaft is installed on the movable housing. The movable clamp is connected to the shaft. The bag clamping power source can drive the shaft to rotate. The fixed clamp and the movable clamp can cooperate to clamp the bag.

[0006] The rotating shaft is connected to the swing block, and the power source for clamping the bag is a cylinder, with the piston rod of the cylinder hinged to the swing block.

[0007] The outer side of the movable box has an annular groove, and the inner side of the sealing plate has an annular protrusion. The annular protrusion presses the elastic membrane into the annular groove.

[0008] A bag feeding device is installed on the base. The bag feeding device includes a bag feeding gripper and a linear guide rail. The bag feeding gripper is located on the linear guide rail and includes a gripper base, a fixed gripper, a movable gripper, and a gripper power source. The fixed gripper is connected to the gripper base, and the movable gripper is hinged to the gripper base. The gripper power source can drive the movable gripper to rotate. The fixed gripper and the movable gripper can enter between the fixed box and the movable box.

[0009] The machine base is equipped with multiple vacuum heat sealing devices along the bag feeding direction, and the linear guide rail is equipped with multiple bag feeding grippers.

[0010] The reset spring is sleeved on the telescopic rod, with one end of the reset spring acting on the movable box and the other end acting on the push plate.

[0011] According to the present invention, a vacuum packaging machine uses an air bladder to push a heat sealing mechanism to heat-press the bag, making the heat-pressing force on the bag more even and the heat-sealing effect of the bag opening better. Attached Figure Description

[0012] Figure 1 This is a perspective view of the present utility model;

[0013] Figure 2 This is a schematic diagram of the vacuum heat sealing device;

[0014] Figure 3 This is a structural diagram of the movable box;

[0015] Figure 4 This is the front view of the movable housing;

[0016] Figure 5 for Figure 4 A cross-sectional view along the AA direction;

[0017] Figure 6 This is a schematic diagram of the bag-feeding gripper structure. Detailed Implementation

[0018] like Figure 1 As shown, this vacuum packaging machine includes a base 1 and a vacuum heat sealing device 2, which includes a vacuum chamber and a heat sealing mechanism. After the bag enters the vacuum chamber and is vacuumed, the heat sealing mechanism heat seals the bag opening, thereby completing the vacuum heat sealing packaging of the bag.

[0019] like Figure 2 As shown, the vacuum chamber includes a fixed chamber 20 and a movable chamber 21, and the heat sealing mechanism includes a fixed heat sealing mold 220 (e.g., Figure 5 (As shown) The movable heat sealing mold 22 and the fixed heat sealing mold 220 are installed inside the fixed housing 20, and the movable heat sealing mold 22 is installed inside the movable housing 21. The movable housing 21 is connected to the power source 211 that drives the movable housing 21 to move. The movable housing 21 is slidably mounted on the base 1 via guide rails, and the power source 211 can drive the movable housing 21 to move; as shown Figure 4 and Figure 5 As shown, in order to drive the movable heat sealing mold 22 to move, the movable heat sealing mold 22 is connected to the telescopic rod 29. The telescopic rod 29 is slidably mounted on the movable housing 21 (the movable housing 21 is equipped with a linear bearing, and the telescopic rod 29 is installed in the linear bearing, allowing the telescopic rod 29 to slide back and forth). The other end of the telescopic rod 29 is connected to the push plate 27. The outer side of the movable housing 21 is provided with a movable space 210 for the push plate 27 to move back and forth. A return spring 290 is provided between the push plate 27 and the movable housing 21. A sealing plate 26 is connected to the outer side of the movable housing 21. An elastic membrane 28 is connected between the sealing plate 26 and the movable housing 21. The elastic membrane 28 is connected to the outer side of the push plate 27. There is a sealed air cavity 260 between the elastic membrane 28 and the sealing plate 26. In addition, a vent connector 261 for connecting to an air source is provided on the sealing plate 26. The vent connector 261 communicates with the air cavity 260.

[0020] The working principle of the vacuum heat sealing device 2 is as follows: When the bag enters between the fixed box 20 and the movable box 21, the bag is clamped by the bag clamping mechanism. The power source 211 drives the movable box 21 to move, and the movable box 21 merges with the fixed box 20 to form a sealed vacuum box. Then, the vacuum pump evacuates the vacuum box, creating a vacuum inside the vacuum box. The bag is also vacuumed and thus adheres to the box. Then, air enters through the vent 261, filling the air chamber 260 with air. The elastic membrane 28 inflates, thereby pushing the push plate. 27 moves forward. Since the push plate 27 is connected to the movable heat-sealing mold 22 via the telescopic rod 29, the movable heat-sealing mold 22 moves forward. The movable heat-sealing mold 22 and the fixed heat-sealing mold 220 are pressed together at the bag opening to heat-seal the bag opening. After sealing, the vacuum box restores air pressure, and the solenoid valve controls the vent connector 261 to vent (the solenoid valve is connected to the vent connector 261). The push plate 27 is reset under the action of the return spring 290, and the elastic membrane 28 is also reset. Finally, the vacuum box is opened, and the bag can be sent away.

[0021] like Figure 2 As shown, the movable housing 21 is equipped with a bag clamping mechanism, which includes a fixed clamp 24, a movable clamp 23, and a bag clamping power source 251. The fixed clamp 24 is located below the movable heat sealing mold 22. A rotatable shaft 25 is installed on the movable housing 21. The movable clamp 23 is connected to the shaft 25. The bag clamping power source 251 can drive the shaft 25 to rotate. Driven by the bag clamping power source 251, the fixed clamp 24 and the movable clamp 23 can cooperate to clamp the bag.

[0022] To drive the rotating shaft 25 to rotate back and forth, the rotating shaft 25 is connected to the swing block 250. The bag clamping power source 251 is a cylinder, and the piston rod of the cylinder is hinged to the swing block 250. The piston rod of the cylinder pulls the swing block 250 to rotate, and the swing block 250 can drive the rotating shaft 25 to rotate, thereby causing the movable clamp 23 to open or close.

[0023] To facilitate the connection of the elastic membrane 28, such as Figure 5 As shown, the outer side of the movable housing 21 has an annular groove 212, and the inner side of the sealing plate 26 has an annular protrusion 262. The annular protrusion 262 presses the elastic membrane 28 into the annular groove 212. This structure not only facilitates the connection of the elastic membrane 28 between the sealing plate 26 and the outer side of the movable housing 21, but also enables a good seal to be formed between the sealing plate 26 and the elastic membrane 28.

[0024] like Figure 1 As shown, a bag feeding device is installed on the base 1. This device is used to deliver bags into the vacuum chamber. The bag feeding device includes a bag gripper 3 and a linear guide rail 4. The bag gripper 3 is mounted on the linear guide rail 4 and is used to grip the bag and move it along the linear guide rail 4 to deliver the bag into the vacuum chamber. Figure 6As shown, the bag-feeding gripper 3 includes a gripper base 30, a fixed gripper 31, a movable gripper 32, and a gripper power source 33. The fixed gripper 31 is connected to the gripper base 30, and the movable gripper 32 is hinged to the gripper base 30. The gripper power source 33 can drive the movable gripper 32 to rotate. Driven by the gripper power source 33, the movable gripper 32 can cooperate with the fixed gripper 31 to clamp the bag. That is, the fixed gripper 31 and the movable gripper 32 can clamp the bag and enter it between the fixed box 20 and the movable box 21, waiting for the bag clamping mechanism to clamp the bag.

[0025] To facilitate the installation of the return spring 290, it is sleeved on the telescopic rod 29. One end of the return spring 290 acts on the movable housing 21, and the other end acts on the push plate 27. Installing the return spring 290 is as simple as sleeved onto the telescopic rod 29, making installation and removal very convenient.

[0026] Finally, it is worth mentioning that multiple vacuum heat-sealing devices 2 are installed on the base 1 along the bag feeding direction, while multiple bag feeding grippers 3 are installed on the linear guide rail 4. The multiple bag feeding grippers 3 feed bags to multiple vacuum heat-sealing devices 2, which allows a larger number of bags to be heat-sealed simultaneously, improving packaging efficiency.

Claims

1. A vacuum packaging machine, comprising a base (1) and a vacuum heat sealing device (2), wherein the vacuum heat sealing device (2) includes a vacuum chamber and a heat sealing mechanism, the vacuum chamber includes a fixed chamber body (20) and a movable chamber body (21), the heat sealing mechanism includes a fixed heat sealing mold (220) and a movable heat sealing mold (22), the fixed heat sealing mold (220) is installed in the fixed chamber body (20), the movable heat sealing mold (22) is installed in the movable chamber body (21), and the movable chamber body (21) is connected to a power source (211) for driving the movable chamber body (21) to move, characterized in that: The movable heat-sealing mold (22) is connected to the telescopic rod (29), which is slidably mounted on the movable box (21). The other end of the telescopic rod (29) is connected to a push plate (27). The outer side of the movable box (21) is provided with a movable space (210) for the push plate (27) to move back and forth. A return spring (290) is provided between the push plate (27) and the movable box (21). A sealing plate (26) is connected to the outer side of the movable box (21). An elastic membrane (28) is connected between the sealing plate (26) and the movable box (21). The elastic membrane (28) is connected to the outer side of the push plate (27). An air cavity (260) is provided between the elastic membrane (28) and the sealing plate (26). A vent connector (261) for connecting to an air source is provided on the sealing plate (26). The vent connector (261) is connected to the air cavity (260).

2. A vacuum packaging machine according to claim 1, characterized in that: The movable housing (21) is provided with a bag clamping mechanism, which includes a fixed clamp (24), a movable clamp (23) and a bag clamping power source (251). The fixed clamp (24) is located below the movable heat sealing mold (22). The movable housing (21) is equipped with a rotatable shaft (25). The movable clamp (23) is connected to the shaft (25). The bag clamping power source (251) can drive the shaft (25) to rotate. The fixed clamp (24) and the movable clamp (23) can cooperate to clamp the bag.

3. A vacuum packaging machine according to claim 2, characterized in that: The rotating shaft (25) is connected to the swing block (250), and the bag clamping power source (251) is a cylinder. The piston rod of the cylinder is hinged to the swing block (250).

4. A vacuum packaging machine according to claim 1 or 2, characterised in that: The outer side of the movable box (21) has an annular strip groove (212), and the inner side of the sealing plate (26) has an annular strip protrusion (262). The annular strip protrusion (262) presses the elastic membrane (28) into the annular strip groove (212).

5. A vacuum packaging machine according to claim 1 or 2, characterized in that: A bag feeding device is installed on the base (1). The bag feeding device includes a bag feeding gripper (3) and a linear guide rail (4). The bag feeding gripper (3) is located on the linear guide rail (4). The bag feeding gripper (3) includes a gripper base (30), a fixed gripper (31), a movable gripper (32), and a gripper power source (33). The fixed gripper (31) is connected to the gripper base (30). The movable gripper (32) is hinged to the gripper base (30). The gripper power source (33) can drive the movable gripper (32) to rotate. The fixed gripper (31) and the movable gripper (32) can enter between the fixed housing (20) and the movable housing (21).

6. A vacuum packaging machine according to claim 5, characterized in that: The base (1) is provided with multiple vacuum heat sealing devices (2) along the bag feeding direction, and the linear guide rail (4) is provided with multiple bag feeding grippers (3).

7. A vacuum packaging machine according to claim 1, characterized in that: The reset spring (290) is sleeved on the telescopic rod (29). One end of the reset spring (290) acts on the movable box (21), and the other end acts on the push plate (27).

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