Vacuum packaging machine and control method thereof

Abstract

A vacuum packaging machine comprises a housing, a control panel, a vacuum pumping assembly, and a sealing assembly. The housing is characterized by a slot on one side, an upper chamber disposed within the housing and located above the slot, and a lower chamber located below the slot. The upper and lower chambers are joined to form a sealed first vacuum chamber. The machine also includes a lifting assembly, which includes a second vacuum chamber. A movable plate is embedded in the top of the second vacuum chamber, allowing it to move up and down. The upper chamber is connected to the movable plate. The second vacuum chamber is connected to the first chamber via a first pipe. The second vacuum chamber is connected to a vacuum pump. The first pipe is provided with an on-off valve. One of the upper and lower chambers is provided with an openable and closable air release device. The vacuum packaging machine has a simple and compact overall structure and low power consumption. A control method for the vacuum packaging machine is also provided.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging machines, and in particular to a vacuum packaging machine and a control method thereof. Background Art

[0002] The Chinese utility model patent with the authorization announcement number CN 212556953 U discloses a vacuum packaging machine, the structure of which is as follows: Figure 1 As shown, it includes a shell 1a and a vacuum cover 2a. A fixed seat is provided on the upper surface of the shell 1a, and a cylinder fixing arm 3a is provided on the inner wall of the shell 1a. The right side of the cylinder fixing arm 3a is fixedly connected to the shaft seat 4a by bolts. The inner wall of the shaft seat 4a is rotatably connected to the Airtac cylinder 5a through a connecting shaft. A movable shaft 6a is provided on the output shaft of the Airtac cylinder 5a. The surface of the movable shaft 6a is movably sleeved with a rotating swing arm 7a. The rotating swing arm 7a is fixedly connected to the lower surface of the vacuum cover 2a. The inner wall of the fixed seat is movably connected with a rotating shaft 8a. The vacuum cover 2a is movably sleeved on the surface of the rotating shaft 8a. There are two cylinder fixing arms 3a, and the number of Airtac cylinders 5a and rotating shafts 8a corresponding to each cylinder fixing arm 3a is also two.

[0003] However, the existing vacuum packaging machines have the following technical problems: the flip-cover structure requires a complex flip-cover mechanism, which includes a cylinder fixed arm 3a, an axle seat 4a, a connecting shaft, an Airtac cylinder 5a, a movable shaft 6a, a rotating swing arm 7a, and a rotating shaft 8a, and needs to be set on both the left and right sides. Therefore, the overall structure is very complex and not compact enough; in addition, the flip-cover mechanism is equipped with multiple electric drive components, which consumes a lot of power and requires an external power supply with a line to work, which is inconvenient to use. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a vacuum packaging machine with a simple and compact overall structure and low power consumption.

[0005] The technical solution of the present invention is: a vacuum packaging machine, including a shell, and a control panel, a vacuum assembly and a sealing assembly arranged in the shell, characterized in that: a slot is provided on one side of the shell, the vacuum assembly includes an upper half cavity provided in the shell and located above the slot, and a lower half cavity located below the slot, the upper half cavity and the lower half cavity are both open on one side near the slot and can be connected up and down to form a closed first vacuum cavity, and also includes a lifting assembly connected to the upper half cavity, the lifting assembly includes a second vacuum cavity, the first half cavity is provided with a plurality of holes, and the upper half cavity is provided with a plurality of holes. A movable plate that can move up and down is sealed and embedded in the top of the two vacuum chambers. An elastic reset device is provided between the bottom of the movable plate and the bottom of the second vacuum chamber. The upper half cavity is connected to the movable plate and is used to close or separate from the lower half cavity as the movable plate rises and falls. The second vacuum chamber is connected to the first vacuum chamber through a first pipe. The second vacuum chamber is connected to the vacuum pump. A switch valve is provided on the first pipe. One of the upper half cavity and the lower half cavity is provided with an openable and closable deflation device. The vacuum pump, switch valve and sealing assembly are all electrically connected to the control board.

[0006] The working principle of the vacuum packaging machine of the present invention is as follows:

[0007] When not working, the upper half cavity is separated from the lower half cavity; when working, the bag mouth of the packaging bag is placed on the slot of the shell, the switch valve is closed, the vacuum pump is started, the pressure in the second vacuum chamber drops, and the external atmospheric pressure pushes the movable plate downward. At the same time, the upper half cavity follows the movable plate to drop and dock with the lower half cavity to form a closed first vacuum chamber. After docking, the upper half cavity and the lower half cavity press the bag mouth of the packaging bag tightly, open the switch valve, and vacuum is drawn through the first vacuum chamber to remove all the air in the packaging bag. Then, the vacuum pump is turned off, and the bag mouth is sealed with the sealing assembly. Then, the venting device is opened, and the first vacuum chamber gradually restores to atmospheric pressure, and the second vacuum chamber connected to it also gradually restores to atmospheric pressure. At this time, the movable plate is pushed upward under the action of the elastic reset device, and then drives the upper half cavity to rise with the movable plate and separate from the lower half cavity, so that the packaging bag with the sealed bag mouth can be taken out.

[0008] After adopting the above structure, the present invention has the following advantages:

[0009] The vacuum packaging machine of the present invention does not need to be provided with a flip cover structure. Instead, a slot for placing the packaging bag is provided on the shell, and the first vacuum chamber for vacuuming the packaging bag is divided into an upper half cavity and a lower half cavity, and the upper half cavity is provided to be liftable, and the lifting of the upper half cavity can replace the flip cover structure, thereby realizing the loading, pressing and taking out of the packaging bag; secondly, the lifting component for lifting the upper half cavity only needs to be provided with a second vacuum chamber, and a movable plate and an elastic reset device are provided in the second vacuum chamber, and the structure is very simple and compact; thirdly, the lifting component is not provided with an electric drive element, but only allows the pipeline of the vacuum pump to flow through the second vacuum chamber, and by controlling the vacuuming component, the vacuuming effect generated by it and the atmospheric pressure produce a pressure difference, so as to prompt the movable plate on the top of the second vacuum chamber to rise and fall, thereby driving the upper half cavity to rise and fall, and the power consumption is very small, so that mobile power supply becomes possible, and no wired operation is required, which is more convenient to use.

[0010] Preferably, the device further includes a motor disposed within the housing, wherein the sealing assembly includes a heating wheel disposed within the housing and positioned at the slot. The motor is connected to the vacuum assembly via a first, detachable transmission mechanism. When the upper cavity is pressed against the lower cavity, the motor engages the first transmission mechanism to drive the vacuum assembly to move linearly along the length of the slot. The motor is further connected to the heating wheel via a second transmission mechanism to drive the heating wheel to rotate and heat the bag opening through which it moves, thereby heat-sealing it. The motor and heating wheel are both electrically connected to a control panel. The movable vacuum assembly is configured to move synchronously with the bag when the heating wheel rotates and drives the bag to roll, thereby ensuring a good seal at the bag opening and a good vacuum level.

[0011] Preferably, the second transmission mechanism comprises a transmission wheel arranged on the rotating shaft of the motor, wherein the transmission wheel is engaged with the heating wheel. The second transmission mechanism has a simple structure.

[0012] Preferably, the first transmission mechanism includes a rack disposed on the upper cavity, the transmission wheel disposed above the heating wheel, the rack disposed above the transmission wheel and capable of engaging with the transmission wheel when the upper cavity descends, and the rack extending in a direction aligned with the length of the slot. This first transmission mechanism has a simple structure and utilizes a rack transmission, ensuring accurate and reliable positional movement.

[0013] Preferably, a guide structure is provided between the bottom of the second vacuum chamber and the housing. This arrangement can assist the first transmission mechanism in guiding the movement of the vacuum pump assembly, making the movement direction more accurate and reliable, and the structure provided between the bottom of the second vacuum pump and the housing is also more compact.

[0014] Preferably, the deflation device includes a deflation valve disposed on the upper or lower cavity, and a first button disposed on the deflation valve for controlling the opening and closing of the deflation valve. A baffle is further disposed within the housing, disposed in the direction of movement of the first button and at an end point, for triggering the first button at the end point. The deflation device is automatically triggered, requiring no manual operation.

[0015] Preferably, one of the upper and lower cavities is provided with a buckle, and the other is provided with a slot seat for engaging the buckle. A triggering device is also provided for triggering the buckle to disengage from the slot seat. The triggering device includes a second button disposed on the opposite side of the slot seat from the snap-on opening, and a baffle disposed within the housing. The baffle is disposed in the direction of movement of the second button and at the endpoint, for triggering the second button at the endpoint. The provision of the buckle and slot seat further secures the connection between the upper and lower cavities, thereby ensuring that the packaging bag is securely compressed between the two. The provision of the triggering device facilitates the separation of the upper and lower cavities, facilitating removal of the packaging bag, and the triggering device is automatically triggered, eliminating the need for manual operation.

[0016] Preferably, the housing is provided with a first position detection device and a second position detection device located at the slot, both of which are electrically connected to the control board. This arrangement monitors the position of the packaging bag and accurately controls the actions of various components accordingly, such as when to perform heat sealing or vacuuming.

[0017] Preferably, the heating wheel is provided with a temperature detection device electrically connected to the control board. This arrangement can detect the temperature of the heating wheel according to the temperature detection device, thereby controlling the heating power of the heating wheel and the operation of other components.

[0018] Preferably, a pressure detection device electrically connected to the control board is provided in the second vacuum chamber, and this arrangement can control the operation of the vacuum pump and other components according to the pressure detected by the pressure detection device.

[0019] Another technical problem to be solved by the present invention is to provide a control method for a vacuum packaging machine with low power consumption and high degree of automation.

[0020] Another technical solution of the present invention is: a control method for a vacuum packaging machine, characterized in that it includes the following steps:

[0021] (1) The opening of the packaging bag is placed on the slot of the housing and located at a specified position, and the first position detection device detects the packaging bag;

[0022] (2) The control panel starts the heating wheel to heat, and then starts the motor to drive the heating wheel to rotate. The rotation of the heating wheel drives the packaging bag to roll and heat-seal the bag opening;

[0023] (3) When the packaging bag leaves the first position detection device and is detected by the second position detection device, the control panel turns off the motor and stops the heating wheel from heating, and at the same time closes the switch valve and starts the vacuum pump. The movable plate presses down to drive the upper half cavity to press the lower half cavity to form a first vacuum cavity;

[0024] (4) The control panel opens the switch valve, and the packaging bag pressed between the upper and lower half cavities is vacuumed through the first vacuum chamber. After the vacuuming is completed, the vacuum pump is turned off;

[0025] (5) The control panel starts the heating wheel to heat, and then starts the motor, which drives the heating wheel to rotate and drives the vacuum assembly to move the packaging bag along the length of the slot. The heating wheel heat-seals the remaining part of the packaging bag that has passed through;

[0026] (6) Open the venting device, turn off the motor, and stop heating the heating wheel. The first vacuum chamber gradually returns to atmospheric pressure, and the second vacuum chamber connected to it also gradually returns to atmospheric pressure. At this time, the movable plate is pushed upward by the elastic reset device, and then drives the upper half of the cavity to rise with the movable plate and separate from the lower half of the cavity;

[0027] (7) Take out the sealed packaging bag.

[0028] After adopting the above method, the present invention has the following advantages:

[0029] The control method of the vacuum packaging machine of the present invention controls the vacuum pumping component so that the vacuum pumping effect generated by the component produces a pressure difference with the atmospheric pressure, thereby causing the movable plate on the top of the second vacuum chamber to rise and fall, thereby driving the upper half of the chamber to rise and fall. The power consumption is very small, making it possible to supply power with a mobile power supply, eliminating the need for wired operation and making it more convenient to use. The control panel coordinates the operation of various components, and the degree of automation is high.

[0030] Preferably, the deflation device includes a deflation valve disposed on the upper or lower cavity, and a first button disposed on the deflation valve for controlling the opening and closing of the deflation valve. A baffle is further disposed within the housing, the baffle being disposed in the direction of movement of the first button and located at an end point. In step (6), when the baffle touches the first button, the deflation valve is opened. This arrangement can automatically trigger the opening and closing of the deflation valve.

[0031] Preferably, one of the upper and lower cavities is provided with a snap, and the other is provided with a slot seat for snapping the snap, further comprising a triggering device for triggering the snap to detach from the slot seat, the triggering device comprising a second button provided on the opposite side of the bayonet of the slot seat, and a baffle provided in the housing, the baffle being provided in the moving direction of the second button and located at the end point, when the movable plate is pressed downward to drive the upper cavity to press against the lower cavity in step (3), the snap is snapped into the slot to fix the upper cavity and the lower cavity, and in step (6), when the baffle touches the first button, it also touches the second button, causing the snap to detach from the slot. This arrangement can automatically trigger the snap to detach from the slot.

[0032] Preferably, in steps (2) and (5), after the control panel activates the heating wheel and before the motor is activated, a temperature detection device provided on the heating wheel detects the temperature of the heating wheel. When the temperature of the heating wheel is greater than a first set value, the heating wheel is controlled to heat at a constant temperature and the motor is activated. This arrangement can achieve a better heat sealing effect of the heating wheel.

[0033] Preferably, in step (4), a pressure detection device disposed in the second vacuum chamber is used to detect whether the vacuuming is complete. When the pressure detection device detects that the pressure in the second vacuum chamber is lower than a second set value, the vacuuming is complete. The pressure detection device has a simple structure and accurate detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural diagram of an existing vacuum packaging machine;

[0035] Figure 2 Schematic diagram of the structure of the vacuum packaging machine in Example 1;

[0036] Figure 3 This is a schematic structural diagram of the vacuum packaging machine in Example 1 from a first perspective after the shell is hidden;

[0037] Figure 4 This is a schematic structural diagram of the vacuum packaging machine in Example 1 from a second perspective after the shell is hidden;

[0038] Figure 5 This is a schematic structural diagram of the vacuum packaging machine in Example 1 from a third perspective after the shell is hidden;

[0039] Figure 6 Schematic diagram of the structure of the second vacuum chamber in Example 1;

[0040] In the prior art figure: 1a-housing, 2a-vacuum cover, 3a-cylinder fixed arm, 4a-axle seat, 5a-Airtac cylinder, 6a-movable shaft, 7a-rotating swing arm, 8a-rotating shaft;

[0041] In the figure of the present invention: 1-housing, 2-slot, 3-upper half cavity, 4-lower half cavity, 5-first vacuum chamber, 6-second vacuum chamber, 7-movable plate, 8-elastic reset device, 9-first pipeline, 10-vacuum pump, 11-switch valve, 12-motor, 13-heating wheel, 14-transmission wheel, 15-rack, 16-buckle, 17-slot seat, 18-bayonet, 19-first button, 20-air release valve, 21-second button, 22-first position detection device, 23-second position detection device, 24-temperature detection device, 25-slider. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0043] Example 1:

[0044] like Figure 2-6 As shown, this embodiment provides a vacuum packaging machine, including a shell 1, a control panel, a vacuum assembly and a sealing assembly arranged in the shell 1, a slot 2 is provided on one side of the shell 1, the vacuum assembly includes an upper half cavity 3 arranged in the shell 1 and located above the slot 2, and a lower half cavity 4 located below the slot 2, the upper half cavity 3 and the lower half cavity 4 are both open on one side close to the slot 2 and can be connected up and down to form a closed first vacuum chamber 5, and also includes a lifting assembly connected to the upper half cavity 3, the lifting assembly includes a second vacuum chamber 6, the top of the second vacuum chamber 6 is sealed with a movable plate 7 that can move up and down, and an elastically resilient member is provided between the bottom of the movable plate 7 and the bottom of the second vacuum chamber 6. Positioning device 8, the upper half cavity 3 is connected to the movable plate 7, and is used to close or separate from the lower half cavity 4 as the movable plate 7 rises and falls. The second vacuum cavity 6 is connected to the first vacuum cavity 5 through a first pipe 9, and the second vacuum cavity 6 is connected to the vacuum pump 10. The first pipe 9 is provided with a switch valve 11. One of the upper half cavity 3 and the lower half cavity 4 is provided with an openable and closable deflation device. The vacuum pump 10, the switch valve 11 and the sealing assembly are all electrically connected to the control board. In this embodiment, the upper half cavity 3 and the lower half cavity 4 are both L-shaped, and the elastic reset device 8 includes four springs, which are respectively arranged at the four corners of the movable plate 7. The control board can adopt existing technology, and the core component is a single-chip microcomputer or DSP, which is not shown in the figure.

[0045] It also includes a motor 12 arranged in the housing 1, and the sealing assembly includes a heating wheel 13 arranged in the housing 1 and located at the slot 2. The motor 12 is connected to the vacuum assembly through a first clutchable transmission mechanism. When the upper half cavity 3 presses the lower half cavity 4, the motor 12 engages with the first transmission mechanism to drive the vacuum assembly to move linearly along the length direction of the slot 2. The motor 12 is also connected to the heating wheel 13 through a second transmission mechanism to drive the heating wheel 13 to rotate and heat the bag mouth moving through to make it heat-sealed. The motor 12 and the heating wheel 13 are both electrically connected to the control board; the second transmission mechanism It includes a transmission wheel 14 arranged on the rotating shaft of the motor 12, and the transmission wheel 14 is engaged with the heating wheel 13; the first transmission mechanism includes a rack 15 arranged on the upper cavity 3, and the transmission wheel 14 is arranged above the heating wheel 13. The rack 15 is arranged above the transmission wheel 14 and can be engaged with the transmission wheel 14 when the upper cavity 3 descends, and the extension direction of the rack 15 is consistent with the length direction of the slot 2; a guide structure is also provided between the bottom of the second vacuum chamber 6 and the shell 1. The guide structure can adopt existing technology, such as the matching structure of the slider 25 and the slide groove, and the slide groove is no longer shown in the figure.

[0046] The deflation device includes a deflation valve 20 arranged on the upper half cavity 3 or the lower half cavity 4, and a first button 19 arranged on the deflation valve 20 for controlling the opening and closing of the deflation valve 20. A baffle is also provided in the shell 1. The baffle is arranged in the moving direction of the first button 19 and is located at the end point, and is used to trigger the action of the first button 19 at the end point. In this embodiment, the deflation valve 20 is arranged on the lower half cavity 4, and the setting of the baffle can adopt the existing technology, which is not shown in the figure.

[0047] The upper cavity 3 and the lower cavity 4 are each provided with a buckle 16 on one side, and a slot seat 17 for engaging the buckle 16 on the other side. The buckle 16 also includes a trigger device for triggering the buckle 16 to disengage from the slot seat 17. The trigger device includes a second button 21 arranged on the opposite side of the bayonet 18 of the slot seat 17, and a baffle arranged in the shell 1. The baffle is arranged in the moving direction of the second button 21 and is located at the end point, and is used to trigger the second button 21 to act at the end point. In this embodiment, the buckle 16 is arranged on the outside of the upper cavity 3, and the slot seat 17 is arranged on the outside of the lower cavity 4, and the positions of the two correspond.

[0048] A first position detection device 22 and a second position detection device 23 are further provided on the housing 1 at the slot 2 . The first position detection device 22 and the second position detection device 23 are both electrically connected to the control board.

[0049] The heating wheel 13 is provided with a temperature detection device 24 electrically connected to the control panel.

[0050] A pressure detection device electrically connected to the control board is provided in the second vacuum chamber 6 . The pressure detection device can be made using existing technology and is not shown in the figure.

[0051] Example 2:

[0052] This embodiment provides a control method for a vacuum packaging machine. The method is based on the vacuum packaging machine in Example 1 and includes the following steps:

[0053] (1) The opening of the packaging bag is placed on the slot 2 of the housing 1 and is located at a specified position, and the first position detection device 22 detects the packaging bag;

[0054] (2) The control panel starts the heating wheel 13 to heat, and the temperature of the heating wheel 13 is detected by the temperature detection device 24 provided on the heating wheel 13. When the temperature of the heating wheel 13 is greater than a first set value, the heating wheel 13 is controlled to heat at a constant temperature, and the motor 12 is then started to drive the heating wheel 13 to rotate. The rotation of the heating wheel 13 drives the packaging bag to roll and heat-seal the bag opening;

[0055] (3) When the packaging bag leaves the first position detection device 22 and is detected by the second position detection device 23, the control panel turns off the motor 12 and stops the heating wheel 13 from heating. At the same time, the switch valve 11 is closed and the vacuum pump 10 is started. The movable plate 7 is pressed downward to drive the upper cavity 3 to press the lower cavity 4 to form a first vacuum cavity 5. At the same time, the buckle 16 is locked into the slot to fix the upper cavity 3 and the lower cavity 4.

[0056] (4) The control panel opens the switch valve 11, and the packaging bag pressed between the upper half cavity 3 and the lower half cavity 4 is vacuumed through the first vacuum chamber 5. When the pressure detection device detects that the pressure in the second vacuum chamber 6 is lower than the second set value, the vacuuming is completed and the vacuum pump 10 is turned off;

[0057] (5) The control panel starts the heating wheel 13 to heat, and the temperature of the heating wheel 13 is detected by the temperature detection device 24 provided on the heating wheel 13. When the temperature of the heating wheel 13 is greater than the first set value, the heating wheel 13 is controlled to be heated at a constant temperature, and the motor 12 is started again. The motor 12 drives the heating wheel 13 to rotate, and at the same time drives the vacuum assembly to carry the packaging bag along the length direction of the slot 2. The heating wheel 13 heat-seals the remaining part of the packaging bag that has passed through;

[0058] (6) When the baffle touches the first button 19, it also touches the second button 21. At this time, the air release valve 20 is opened and the buckle 16 is disengaged from the slot. The motor 12 is turned off and the heating wheel 13 stops heating. The first vacuum chamber 5 gradually returns to atmospheric pressure, and the second vacuum chamber 6 connected to it also gradually returns to atmospheric pressure. At this time, the movable plate 7 is pushed upward by the elastic reset device 8, and then drives the upper half cavity 3 to rise with the movable plate 7 and separate from the lower half cavity 4.

[0059] (7) Take out the sealed packaging bag.

Claims

1. A vacuum packaging machine, comprising a housing (1), a control panel, a vacuum pumping assembly and a sealing assembly arranged in the housing (1), characterized in that: A slot (2) is provided on one side of the shell (1), and the vacuum pumping assembly includes an upper half cavity (3) arranged in the shell (1) and located above the slot (2), and a lower half cavity (4) located below the slot (2), the upper half cavity (3) and the lower half cavity (4) are both open on one side close to the slot (2) and can be connected up and down to form a closed first vacuum cavity (5), and also includes a lifting assembly connected to the upper half cavity (3), the lifting assembly includes a second vacuum cavity (6), a movable plate (7) that can move up and down is sealed and embedded in the top of the second vacuum cavity (6), an elastic reset device (8) is provided between the bottom of the movable plate (7) and the bottom of the second vacuum cavity (6), the upper half cavity (3) is connected to the movable plate (7), and is used to close or separate from the lower half cavity (4) following the lifting of the movable plate (7), the second vacuum cavity (6) is connected to the first vacuum cavity (5) through a first pipe (9), and the second vacuum cavity (6) The vacuum pump (10) is connected to the housing (1). The first pipe (9) is provided with a switch valve (11). One of the upper half cavity (3) and the lower half cavity (4) is provided with an openable and closable deflation device. The vacuum pump (10), the switch valve (11) and the sealing assembly are all electrically connected to the control panel. The housing (1) also includes a motor (12) arranged in the housing (1). The sealing assembly includes a heating wheel (13) arranged in the housing (1) and located at the slot (2). The motor (12) is connected to the vacuum assembly through a first transmission mechanism that can be disengaged. When the upper half cavity (3) presses the lower half cavity (4), the motor (12) engages with the first transmission mechanism to drive the vacuum assembly to move linearly along the length direction of the slot (2). The motor (12) is also connected to the heating wheel (13) through a second transmission mechanism to drive the heating wheel (13) to rotate and heat the bag opening that moves through to make it heat-sealed. The motor (12) and the heating wheel (13) are both electrically connected to the control panel.

2. A vacuum packaging machine according to claim 1, characterized in that: The second transmission mechanism comprises a transmission wheel (14) arranged on the rotating shaft of the motor (12), and the transmission wheel (14) is engaged with the heating wheel (13).

3. The vacuum packaging machine according to claim 2, characterized in that: The first transmission mechanism comprises a rack (15) arranged on the upper cavity (3), the transmission wheel (14) being arranged above the heating wheel (13), the rack (15) being arranged above the transmission wheel (14) and being capable of meshing with the transmission wheel (14) when the upper cavity (3) descends, and the extension direction of the rack (15) being consistent with the length direction of the slot (2).

4. The vacuum packaging machine according to claim 1, characterized in that: A guide structure is also provided between the bottom of the second vacuum chamber (6) and the housing (1).

5. The vacuum packaging machine according to claim 1, characterized in that: The deflation device comprises a deflation valve (20) arranged on the upper half cavity (3) or the lower half cavity (4), and a first button (19) arranged on the deflation valve (20) for controlling the opening and closing of the deflation valve (20). A baffle is further provided in the housing (1). The baffle is arranged in the moving direction of the first button (19) and is located at the end point, and is used to trigger the action of the first button (19) at the end point.

6. The vacuum packaging machine according to claim 5, characterized in that: The upper half cavity (3) and the lower half cavity (4) are provided with a buckle (16) on one side and a slot seat (17) for engaging the buckle (16) on the other side. The upper half cavity (3) and the lower half cavity (4) further comprise a trigger device for triggering the buckle (16) to disengage from the slot seat (17). The trigger device comprises a second button (21) provided on the opposite side of the bayonet (18) of the slot seat (17), and the baffle provided in the housing (1). The baffle is provided in the moving direction of the second button (21) and at the end point, and is used to trigger the second button (21) to actuate at the end point.

7. The vacuum packaging machine according to claim 3, characterized in that: A first position detection device (22) and a second position detection device (23) are also provided on the housing (1) and located at the slot (2). Both the first position detection device (22) and the second position detection device (23) are electrically connected to the control board.

8. The vacuum packaging machine according to claim 1, characterized in that: The heating wheel (13) is provided with a temperature detection device (24) electrically connected to the control panel.

9. The vacuum packaging machine according to claim 1, characterized in that: A pressure detection device electrically connected to the control panel is provided in the second vacuum chamber (6).

10. A control method for a vacuum packaging machine, applied to the vacuum packaging machine according to claim 7, characterized in that: The following steps are involved: (1) placing the opening of the packaging bag on the slot (2) of the shell (1) and at a designated position, and the first position detection device (22) detects the packaging bag; (2) The control panel starts the heating wheel (13) to heat, and then starts the motor (12) to drive the heating wheel (13) to rotate. The rotation of the heating wheel (13) drives the packaging bag to roll and heat-seal the bag opening; (3) When the packaging bag leaves the first position detection device (22) and is detected by the second position detection device (23), the control panel turns off the motor (12) and stops the heating wheel (13) from heating, and at the same time closes the switch valve (11) and starts the vacuum pump (10), and the movable plate (7) presses down to drive the upper half cavity (3) to press the lower half cavity (4) to form a first vacuum cavity (5); (4) The control panel opens the switch valve (11), and the packaging bag pressed between the upper half cavity (3) and the lower half cavity (4) is vacuumed through the first vacuum chamber (5). After the vacuuming is completed, the vacuum pump (10) is turned off; (5) The control panel starts the heating wheel (13) to heat, and then starts the motor (12). The motor (12) drives the heating wheel (13) to rotate, and at the same time drives the vacuum assembly to carry the packaging bag along the length direction of the slot (2). The heating wheel (13) heat-seals the remaining part of the packaging bag that has passed through; (6) Open the venting device and turn off the motor (12) and stop the heating wheel (13) from heating. The first vacuum chamber (5) gradually returns to atmospheric pressure, and the second vacuum chamber (6) connected thereto also gradually returns to atmospheric pressure. At this time, the movable plate (7) is pushed upward by the elastic reset device (8), and then drives the upper half cavity (3) to rise along with the movable plate (7) and separate from the lower half cavity (4); (7) Take out the sealed packaging bag.

11. The control method of a vacuum packaging machine according to claim 10, characterized in that: The deflation device comprises a deflation valve (20) arranged on the upper half cavity (3) or the lower half cavity (4), and a first button (19) arranged on the deflation valve (20) for controlling the opening and closing of the deflation valve (20). A baffle is further provided in the housing (1), and the baffle is arranged in the moving direction of the first button (19) and is located at the end point. In the step (6), when the baffle touches the first button (19), the deflation valve (20) is opened.

12. The control method of a vacuum packaging machine according to claim 11, characterized in that: The upper cavity (3) and the lower cavity (4) are provided with a buckle (16) on one side and a slot seat (17) for engaging the buckle (16) on the other side. The buckle (16) also includes a trigger device for triggering the buckle (16) to disengage from the slot seat (17). The trigger device includes a second button (21) provided on the opposite side of the bayonet (18) of the slot seat (17), and the baffle provided in the housing (1). The baffle is provided in the moving direction of the second button (21) and is located at the end point. In the step (3), when the movable plate (7) is pressed downward to drive the upper cavity (3) to press the lower cavity (4), the buckle (16) is engaged in the slot to fix the upper cavity (3) and the lower cavity (4). In the step (6), when the baffle touches the first button (19), it also touches the second button (21), causing the buckle (16) to disengage from the slot.

13. The control method of a vacuum packaging machine according to claim 10, characterized in that: After the control panel starts heating the heating wheel (13) and before starting the motor (12) in the steps (2) and (5), the temperature of the heating wheel (13) is detected by a temperature detection device (24) provided on the heating wheel (13). When the temperature of the heating wheel (13) is greater than a first set value, the heating wheel (13) is controlled to be heated at a constant temperature, and the motor (12) is started.

14. The control method of a vacuum packaging machine according to claim 10, characterized in that: In the step (4), a pressure detection device provided in the second vacuum chamber (6) is used to detect whether the vacuuming is completed. When the pressure detection device detects that the pressure in the second vacuum chamber (6) is lower than a second set value, the vacuuming is completed.

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