Vacuum packaging machine and vacuum packaging method

Abstract

The invention relates to the technical field of vacuum packaging machines, in particular to a vacuum packaging machine and a vacuum packaging method.The vacuum packaging machine comprises a base, a box body is fixedly arranged on the base, one end of the box body is fixedly connected with a back plate, and the other end of the box body is rotationally connected with a cover plate capable of sealing the interior of the box body; an extraction structure capable of vacuumizing the interior of the box body is arranged in the base, a rotary structure is arranged on the back plate, the rotary structure comprises a plurality of shelving plates which are evenly arranged in the box body and conduct variable-diameter circumferential rotation, and hot pressing structures matched with the rotary structure are arranged on the shelving plates. The hot-pressing structure comprises a pair of mounting rods capable of synchronously rotating downwards, a first hot-pressing plate is arranged at the lower ends of the mounting rods, and second hot-pressing plates corresponding to the first hot-pressing plate are arranged at the two ends of the shelving plate respectively, so that the problems that in the prior art, the operation is troublesome, the operation intensity is large, and the working efficiency is high due to the fact that the mouth of a packaging bag is manually pressed are effectively solved. And the efficiency is low.

Description

Technical Field

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

[0002] Vacuum packaging, also known as reduced pressure packaging, is to extract all the air in the packaging container and seal it, maintaining the bag in a highly reduced pressure state. The scarce air is equivalent to the low oxygen effect, which deprives microorganisms of the living conditions, so as to achieve the purpose of fresh food and prevent disease and decay.

[0003] When processing fast food products, automatic vacuum packaging equipment is needed to vacuum and seal the packaging bags. During the use of the vacuum packaging machine, the packaging bags need to be placed on the packaging machine manually, and then the open end is placed on the placement seat, and then the packaging bags are fixed by manually turning the pressure rod. Manually turning the pressure rod has the problems of high work intensity and forgetting to operate, and the efficiency is low. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a vacuum packaging machine and a vacuum packaging method, which effectively solves the problem that the opening of the packaging bag is manually pressed, the operation is cumbersome, the operation intensity is high, and the efficiency is low in the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A vacuum packaging machine comprises a base, on which a box body is fixedly arranged, one end of the box body is fixedly connected to a back plate, and the other end of the box body is rotatably connected to a cover plate capable of sealing the inside of the box body, an extraction structure capable of evacuating the inside of the box body is arranged in the base, a rotating structure is arranged on the back plate, the rotating structure comprises a plurality of shelf plates which are evenly arranged in the box body and perform a circular rotation with varying diameters, a hot pressing structure cooperating with the rotating structure is arranged on the shelf plates, the hot pressing structure comprises a pair of mounting rods which can be rotated downward synchronously, a first hot pressing plate is arranged at the lower end of the mounting rods, and second hot pressing plates corresponding to the first hot pressing plate are respectively arranged at both ends of the shelf plates.

[0007] Preferably, the rotating structure also includes a motor arranged at one end of the back plate, the output end of the motor is fixedly connected to a driving spur gear, the driving spur gear is meshed with a driven spur gear rotatably connected to the back plate, the driven spur gear is fixedly connected to a swivel, a plurality of second support rods are evenly arranged and fixedly connected to the swivel, the second support rods are rotatably arranged on the shelf plate, the swivel is coaxially provided with a fixed column, one end of the fixed column is provided with a support frame fixedly connected to the back plate, and the other end of the fixed column is rotatably connected to a turntable at a non-center position.

[0008] Preferably, a plurality of first support rods parallel to the second support rods are evenly arranged on the turntable and the first support rods are rotatably arranged on the shelf plate, and the first support rods and the second support rods are kept parallel and non-coaxially arranged on the shelf plate.

[0009] Preferably, the hot pressing structure also includes a first seat plate and a second seat plate fixedly arranged at both ends of the shelf plate, and the first and second seat plates are rotatably connected at both ends thereof with a first support rod and a second support rod respectively, and one end of the first and second support rods are respectively provided with a cross rod slidably connected to the inner wall of the shelf plate, and the two ends of the cross rods are respectively provided with sliding pins slidably connected to the inner walls of the first and second support rods, an arc connecting rod corresponding to the arc surface of the upper end of the box body is provided between the upper ends of the cross rods, and the mounting rods are respectively provided between the first and second support rods at both ends of the shelf plate.

[0010] Preferably, a sliding column is fixedly connected to the lower end of the cross rod, a fixing rod is fixedly connected to the shelf plate, and a spring sleeved with the sliding column is provided between the fixing rod and the cross rod.

[0011] Preferably, the extraction structure further comprises an air pump arranged in the collecting chamber of the base, the air extraction end of the air pump is provided with a tube body, one end of the tube body extends into the box body and a filter tube head is installed at the position.

[0012] Preferably, one end of the cover plate is rotatably arranged on the box body, and a sealing rubber pad corresponding to the box body is arranged on the inner edge side of the cover plate.

[0013] A vacuum packaging method of a vacuum packaging machine specifically comprises the following steps:

[0014] Step 1: Place the packaging bags containing the products on the shelf plates respectively, with the first hot pressing plate and the second hot pressing plate in an open and closed state, and place the two end portions of the packaging bags between the first hot pressing plate and the second hot pressing plate respectively;

[0015] Step 2: close the cover plate, keep the box body sealed, control the extraction structure to work, and vacuum the packaging bag inside the box body until the vacuum degree inside the packaging bag meets the standard;

[0016] Step 3: Control the rotary structure to work, and the shelf plate performs a variable diameter circular rotation. When the shelf plate moves to the upper end of the box body, the hot pressing structure works;

[0017] Step 4: The mounting rods at both ends of the shelf plate rotate downward synchronously, and the mounting rods drive the first heat pressing plate to rotate downward to fit with the second heat pressing plate respectively, and the open parts at both ends of the packaging bag are heat-sealed synchronously by the first heat pressing plate and the second heat pressing plate after power-on.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention provides a pulley rotating structure so that the shelf plate always maintains the same orientation during the circular rotation. On the one hand, it can prevent the packaging bag from falling off. On the other hand, since the turntable is arranged at the upper end of the non-center part of the fixed column, it can be ensured that when the shelf plate rotates in a circular manner to the arc surface at the upper end of the box body, it is at the circumferential diameter with the largest variable diameter rotation, thereby ensuring the normal progress of the subsequent hot pressing process.

[0020] 2. By setting up a hot pressing structure, when the shelf plate moves to the upper end of the box body, the hot pressing structure works, and the mounting rods at both ends of the shelf plate rotate downward synchronously, and the mounting rods respectively drive the first hot pressing plate to rotate downward to fit with the second hot pressing plate, and the first hot pressing plate and the second hot pressing plate after power-on are used to heat-seal the open parts at both ends of the packaging bag synchronously, and by setting up multiple shelf plates, it can be used to evacuate multiple packaging bags and then heat-seal them, which effectively improves the work efficiency, and the heat-sealing process is carried out in a vacuum state in the box body. Compared with taking out the packaging bag after vacuum treatment and then heat-sealing, it can prevent the vacuumized packaging bag from entering the air and affecting the vacuum efficiency of the product in the packaging bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an axonometric view of the present invention;

[0022] Figure 2 It is a front view of the present invention;

[0023] Figure 3 It is a first structural schematic diagram of the rotary structure of the present invention;

[0024] Figure 4 is a second structural schematic diagram of the rotary structure of the present invention;

[0025] Figure 5 It is a third structural schematic diagram of the rotary structure of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the rotating ring of the present invention;

[0027] Figure 7 It is a first structural schematic diagram of the hot pressing structure of the present invention;

[0028] Figure 8 It is a second structural schematic diagram of the hot pressing structure of the present invention;

[0029] Fig. 9 It is a structural schematic diagram of the cross rod of the present invention;

[0030] In the figure: 1, base, 2, box body, 3, back plate, 4, cover plate, 5, collecting chamber, 6, vacuum pump, 7, tube body, 8, fixed column, 9, turntable, 10, first support rod, 11, shelf plate, 12, motor, 13, active spur gear, 14, swivel, 15, driven spur gear, 16, second support rod, 17, arc connecting rod, 18, cross rod, 19, first support rod, 20, first seat plate, 21, sliding pin, 22, fixed rod, 23, sliding column, 24, spring, 25, second seat plate, 26, mounting rod, 27, first hot pressing plate, 28, second hot pressing plate, 29, sealing pad, 30, second support rod, 31, mounting seat, 32, filter tube head, 33, support frame. DETAILED DESCRIPTION

[0031] like Figure 1-9 As shown, a vacuum packaging machine comprises a base 1, on which a box body 2 is fixedly arranged, one end of the box body 2 is fixedly connected to a back plate 3, and the other end of the box body 2 is rotatably connected to a cover plate 4 which can seal the inside of the box body 2, an extraction structure which can evacuate the inside of the box body 2 is arranged in the base 1, a rotating structure is arranged on the back plate 3, the rotating structure comprises a plurality of shelf plates 11 which are evenly arranged in the box body 2 and perform a circular rotation with a variable diameter, a hot pressing structure which cooperates with the rotating structure is arranged on the shelf plates 11, the hot pressing structure comprises a pair of mounting rods 26 which can rotate downward synchronously, a first hot pressing plate 27 is arranged at the lower end of the mounting rods 26, and second hot pressing plates 28 corresponding to the first hot pressing plate 27 are respectively arranged at both ends of the shelf plates 11.

[0032] When the present invention is in use, the packaging bags containing products are placed on the shelf plates 11 respectively, the first hot pressing plate 27 and the second hot pressing plate 28 are in an open and closed state, the two end portions of the packaging bag are placed between the first hot pressing plate 27 and the second hot pressing plate 28 respectively, the cover plate 4 is closed, the box body 2 is kept in a sealed state, the extraction structure is controlled to work, the packaging bag inside the box body 2 is vacuumed until the vacuum degree in the packaging bag meets the standard, the rotary structure is controlled to work, the shelf plate 11 performs a variable diameter circular rotation, when the shelf plate 11 moves to the upper end of the box body 2, the hot pressing structure works, the mounting rods 26 at both ends of the shelf plate 11 rotate downward synchronously, and the mounting rods 26 respectively drive the first hot pressing plate 27 to rotate downward until it is in contact with the second hot pressing plate 28, and the first hot pressing plate 27 and the second hot pressing plate 28 after power-on are used to synchronously heat-seal the open parts at both ends of the packaging bag, so that vacuuming and rotary hot pressing sealing can be achieved simultaneously, which greatly improves the efficiency of vacuuming the packaging bag.

[0033] The rotating structure also includes a motor 12 arranged at one end of the back plate 3, the output end of the motor 12 is fixedly connected to a driving spur gear 13, the driving spur gear 13 is meshed with a driven spur gear 15 rotatably connected to the back plate 3, the driven spur gear 15 is fixedly connected to a swivel 14, a plurality of second support rods 16 are evenly arranged and fixedly connected on the swivel 14, the second support rod 16 is rotatably set on the shelf plate 11, the swivel 14 is coaxially provided with a fixed column 8, one end of the fixed column 8 is provided with a support frame 33 fixedly connected to the back plate 3, the other end of the fixed column 8 is rotatably connected to a turntable 9 at a non-center position, a plurality of first support rods 10 parallel to the second support rod 16 are evenly arranged on the turntable 9, and the first support rod 10 is rotatably set on the shelf plate 11, the first support rod 10 and the second support rod 16 remain parallel and are not coaxially set on the shelf plate 11.

[0034] like Figure 4 and 5 As shown in Figure 6, a mounting seat 31 is provided on the back plate 3, and the mounting seat 31 supports the motor 12. When the motor 12 is working, the output end of the motor 12 drives the active spur gear 13 to rotate, and the active spur gear 13 drives the driven spur gear 15 to rotate, and the driven spur gear 15 drives the swivel 14 to rotate. During the self-rotation of the swivel 14, the second support rod 16 evenly arranged on the swivel 14 is respectively driven to rotate in a circle. Since one end of the second support rod 16 is rotatably connected to the shelf plate 11, the fixed column 8 supports and limits the rotation of the first support rod 10 on the turntable 9, and since the first support rod 10 is rotatably connected to the other end of the shelf plate 11, the first support rod 10 and the second support rod 16 are in a parallel state, the second support rod 16 is rotatably arranged at the end of the lower branch of the shelf plate 11, and the first support rod 10 is rotatably arranged at the middle end of the lower branch of the shelf plate 11. Since the first support rod 10 and the second The support rod 16 is not at the same axial rotation point on the shelf plate 11, and the second support rod 16 is fixedly arranged on the swivel 14, so the first support rod 10 and the second support rod 16 can support the shelf plate 11. Since the center point of the circular rotation of the second support rod 16 is different from the center point of the rotation of the first support rod 10 around the turntable 9, the first support rod 10 plays a role in steering adjustment and maintenance of the shelf plate 11 during the circular rotation of the shelf plate 11 along with the second support rod 16, ensuring that the shelf plate 11 always maintains the same orientation, and since the turntable 9 is arranged at the upper end of the non-center part of the fixed column 8, it can be ensured that the shelf plate 11 is at the circumferential diameter with the largest variable diameter rotation when it rotates in a circle to the upper end arc surface of the box body 2, thereby ensuring the normal progress of the subsequent hot pressing process, and by providing multiple shelf plates 11, it can be used to evacuate multiple packaging bags and then perform heat sealing, effectively improving the work efficiency.

[0035] The hot pressing structure also includes a first seat plate 20 and a second seat plate 25 fixedly arranged at both ends of the shelf plate 11, and the first and second seat plates 19, 30 are rotatably connected at both ends of the first and second seat plates 20, 25, respectively. One end of the first and second struts 19, 30 are respectively provided with a cross rod 18 slidably connected to the inner wall of the shelf plate 11, and the two ends of the cross rod 18 are respectively provided with sliding pins 21 slidably connected to the inner walls of the first and second struts 19, 30, respectively. An arc connecting rod 17 corresponding to the arc surface of the upper end of the box body 2 is arranged between the upper ends of the cross rod 18, and the mounting rod 26 is respectively arranged between the first and second struts 19, 30 at both ends of the shelf plate 11.

[0036] like Figure 7 and 8 As shown in 9, when the shelf plate 11 rotates in a circle to the arc surface at the upper end of the box body 2 and is at the position of the largest circumferential diameter of the variable diameter rotation, the arc connecting rod 17 is squeezed with the arc surface at the upper end of the box body 2, and the arc connecting rod 17 drives the cross rods 18 at both ends to slide down respectively, and the cross rods 18 drive the sliding pins 21 at both ends to move downward respectively, and the sliding pins 21 will respectively drive the first support rod 19 and the second support rod 30 to deflect downward during the downward movement, and the first support rod 19 and the second support rod 30 will respectively drive the installation rod 26 to deflect downward at both ends during the downward deflection, and the installation rod 26 drives the first hot pressing plate 27 to deflect downward until it is in contact with the second hot pressing plate 28, thereby performing heat pressure sealing on the open parts at both ends of the packaging bag.

[0037] A slide post 23 is fixedly connected to the lower end of the cross rod 18 , a fixing rod 22 is fixedly connected to the shelf plate 11 , and a spring 24 sleeved and connected to the slide post 23 is provided between the fixing rod 22 and the cross rod 18 .

[0038] like Figure 8 As shown, when the cross rod 18 slides down under pressure, it can drive the slide column 23 to slide along the inner wall of the fixed rod 22, compressing the spring 24 between the fixed rod 22 and the cross rod 18. When the cross rod 18 is no longer compressed, it is reset under the action of the spring 24, ensuring that the open parts of both ends of the packaging bag can be placed between the first hot pressing plate 27 and the second hot pressing plate 28 next time.

[0039] The extraction structure further comprises an air pump 6 disposed in the collecting chamber 5 of the base 1 , and a tube body 7 is disposed at the air extraction end of the air pump 6 , one end of the tube body 7 extends into the box body 2 and a filter tube head 32 is installed at the position.

[0040] like Figure 2As shown, the collecting chamber 5 can be used to store and support the vacuum pump 6. When the vacuum pump 6 is working, the vacuum end of the vacuum pump 6 draws out the residual air in the box body 2 through the tube body 7 to achieve vacuum treatment in the box body 2. The setting of the filter tube head 32 can prevent part of the packaging from falling into the tube body 7, causing the tube body 7 to be blocked and affecting the vacuum efficiency.

[0041] One end of the cover plate 4 is rotatably disposed on the box body 2 , and a sealing rubber pad 29 corresponding to the box body 2 is disposed on the inner edge side of the cover plate 4 .

[0042] like Figure 1 As shown, the packaging bag can be put into or taken out of the box body 2 by opening and closing the cover plate 4 , and the sealing rubber pad 29 on the cover plate 4 can ensure the sealing inside the box body 2 .

[0043] The working process of the present invention is as follows: when the present invention is in use, the packaging bags containing the products are placed on the shelf 11 respectively, the first heat pressing plate 27 and the second heat pressing plate 28 are in an open and closed state, the two end portions of the packaging bag are placed between the first heat pressing plate 27 and the second heat pressing plate 28 respectively, the cover plate 4 is closed, and the box body 2 is kept in a sealed state.

[0044] The vacuum pump 6 works, and the vacuum end of the vacuum pump 6 extracts the residual air in the box body 2 through the tube body 7 to achieve vacuum treatment in the box body 2, and vacuum treatment is performed on the packaging bag inside the box body 2 until the vacuum degree in the packaging bag meets the standard.

[0045] The motor 12 is working, and the output end of the motor 12 drives the active spur gear 13 to rotate, and the active spur gear 13 drives the driven spur gear 15 to rotate, and the driven spur gear 15 drives the swivel 14 to rotate. During the self-rotation of the swivel 14, the second support rod 16 evenly arranged on the swivel 14 is respectively driven to rotate in a circle. Since one end of the second support rod 16 is rotatably connected to the shelf plate 11, the fixed column 8 supports and limits the rotation of the first support rod 10 on the turntable 9, and since the first support rod 10 is rotatably connected to the other end of the shelf plate 11, the first support rod 10 and the second support rod 16 are in a parallel state, and the second support rod 16 is rotatably arranged at the end of the lower branch of the shelf plate 11, and the first support rod 10 is rotatably arranged at the middle end of the lower branch of the shelf plate 11. Since the first support rod 10 and the second support rod 16 are not at the same axial rotation point on the shelf plate 11, and the second support rod 16 is fixedly arranged on the rotating ring 14, so the first support rod 10 and the second support rod 16 can support the shelf plate 11. Since the center point of the circular rotation of the second support rod 16 is different from the center point of the rotation of the first support rod 10 around the turntable 9, the first support rod 10 plays a role in steering adjustment and maintenance of the shelf plate 11 during the circular rotation of the second support rod 16, ensuring that the shelf plate 11 always maintains the same direction. On the one hand, it can prevent the packaging bag from falling off. On the other hand, since the turntable 9 is arranged at the upper end of the non-center part of the fixed column 8, it can be ensured that the shelf plate 11 is at the circumferential diameter with the largest variable diameter rotation when it rotates to the upper end arc surface of the box body 2, ensuring the normal progress of the subsequent hot pressing process, and by providing multiple shelf plates 11, it can be used to evacuate multiple packaging bags and then perform heat sealing, effectively improving the work efficiency.

[0046] When the shelf plate 11 rotates in a circle to the arc surface at the upper end of the box body 2 and is at the maximum circumferential diameter of the variable diameter rotation, the arc link 17 is squeezed with the arc surface at the upper end of the box body 2, and the arc link 17 drives the cross rods 18 at both ends to slide down respectively, and the cross rods 18 drive the sliding pins 21 at both ends to move downward respectively. During the downward movement of the sliding pin 21, the first support rod 19 and the second support rod 30 are driven to deflect downward respectively, and during the downward deflection of the first support rod 19 and the second support rod 30, the mounting rod 26 is driven to deflect downward at both ends respectively. The mounting rod 26 drives the first heat pressing plate 27 to deflect downward until it is in contact with the second heat pressing plate 28, thereby heat-pressing and sealing the open parts at both ends of the packaging bag. When the cross rod 18 slides down under pressure, it can drive the sliding column 23 to slide along the inner wall of the fixed rod 22, compressing the spring 24 between the fixed rod 22 and the cross rod 18. When the cross rod 18 is no longer under pressure, it is reset under the action of the spring 24, ensuring that the open parts at both ends of the packaging bag can be placed between the first heat pressing plate 27 and the second heat pressing plate 28 next time.

[0047] A vacuum packaging method of a vacuum packaging machine specifically comprises the following steps:

[0048] Step 1: Place the packaging bags containing the products on the shelf 11, respectively, with the first hot pressing plate 27 and the second hot pressing plate 28 in an open and closed state, and place the two end portions of the packaging bags between the first hot pressing plate 27 and the second hot pressing plate 28;

[0049] Step 2: close the cover plate 4, keep the box body 2 sealed, and use the vacuum end of the vacuum pump 6 to extract the remaining air in the box body 2 through the tube 7 to achieve vacuum treatment in the box body 2, and vacuum the packaging bag inside the box body 2 until the vacuum degree in the packaging bag meets the standard;

[0050] Step 3, the shelf plate 11 in the box body 2 performs a variable diameter circular rotation. When the shelf plate 11 is at the maximum circumferential diameter of the variable diameter rotation when the circular rotation reaches the arc surface at the upper end of the box body 2, the arc link 17 is squeezed with the arc surface at the upper end of the box body 2, and the arc link 17 drives the cross rods 18 at both ends to slide down respectively, and the cross rods 18 drive the sliding pins 21 at both ends to move downward respectively. In the process of the sliding pins 21 moving downward, the first support rod 19 and the second support rod 30 are driven to deflect downward respectively. In the process of the first support rod 19 and the second support rod 30 deflecting downward respectively, the mounting rod 26 is driven to deflect downward at both ends respectively, and the mounting rod 26 drives the first hot pressing plate 27 to deflect downward until it fits with the second hot pressing plate 28;

[0051] Step 4: The first heat pressing plate 27 is rotated downward to fit with the second heat pressing plate 28 , and the open ends of the packaging bag are heat-sealed synchronously by the first heat pressing plate 27 and the second heat pressing plate 28 after being powered on.

[0052] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum packaging machine, comprising a base (1), characterized in that: A box body (2) is fixedly arranged on the base (1), one end of the box body (2) is fixedly connected to a back plate (3), the other end of the box body (2) is rotatably connected to a cover plate (4) capable of sealing the interior of the box body (2), an extraction structure capable of evacuating the interior of the box body (2) is arranged in the base (1), a rotating structure is arranged on the back plate (3), the rotating structure comprises a plurality of shelf plates (11) uniformly arranged in the box body (2) and capable of rotating in a variable diameter circle, a hot pressing structure matched with the rotating structure is arranged on the shelf plates (11), the hot pressing structure comprises a pair of mounting rods (26) capable of synchronously rotating downward, a first hot pressing plate (27) is arranged at the lower end of the mounting rods (26), and second hot pressing plates (28) corresponding to the first hot pressing plate (27) are respectively arranged at both ends of the shelf plates (11).

2. A vacuum packaging machine according to claim 1, characterized in that: The rotary structure further comprises a motor (12) arranged at one end of the back plate (3); an output end of the motor (12) is fixedly connected to a driving spur gear (13); the driving spur gear (13) is meshed with a driven spur gear (15) rotatably connected to the back plate (3); the driven spur gear (15) is fixedly connected to a rotating ring (14); a plurality of second support rods (16) are evenly arranged and fixedly connected to the rotating ring (14); the second support rods (16) are rotatably arranged on the shelf plate (11); a fixed column (8) is coaxially arranged on the rotating ring (14); a support frame (33) fixedly connected to the back plate (3) is arranged at one end of the fixed column (8); a rotating disk (9) is rotatably connected to the other end of the fixed column (8) at a non-center position.

3. A vacuum packaging machine according to claim 2, characterized in that: The turntable (9) is evenly provided with a plurality of first support rods (10) parallel to the second support rods (16), and the first support rods (10) are rotatably arranged on the shelf plate (11), and the first support rods (10) and the second support rods (16) are kept parallel and arranged on the shelf plate (11) in a non-coaxial manner.

4. A vacuum packaging machine according to claim 1, characterized in that: The hot pressing structure also includes a first seat plate (20) and a second seat plate (25) fixedly arranged at the two ends of the shelf plate (11); the two ends of the first seat plate (20) and the second seat plate (25) are respectively rotatably connected with a first support rod (19) and a second support rod (30); one end of the first support rod (19) and the second support rod (30) are respectively provided with a cross rod (18) slidably connected to the inner wall of the shelf plate (11); the two ends of the cross rod (18) are respectively provided with a sliding pin (21) slidably connected to the inner wall of the first support rod (19) and the second support rod (30); an arc connecting rod (17) corresponding to the arc surface of the upper end of the box body (2) is arranged between the upper ends of the cross rod (18); and the mounting rod (26) is respectively arranged between the first support rod (19) and the second support rod (30) at the two ends of the shelf plate (11).

5. A vacuum packaging machine according to claim 4, characterized in that: The lower end of the cross rod (18) is fixedly connected to a sliding column (23), the shelf plate (11) is fixedly connected to a fixing rod (22), and a spring (24) sleeved and connected to the sliding column (23) is provided between the fixing rod (22) and the cross rod (18).

6. The vacuum packaging machine according to claim 1, characterized in that: The extraction structure also includes an air pump (6) arranged in the collecting chamber (5) of the base (1), and a tube body (7) is arranged at the air extraction end of the air pump (6), one end of the tube body (7) extends into the box body (2) and a filter tube head (32) is installed at the position.

7. The vacuum packaging machine according to claim 1, characterized in that: One end of the cover plate (4) is rotatably arranged on the box body (2), and a sealing rubber pad (29) corresponding to the box body (2) is arranged on the inner edge side of the cover plate (4).

8. The vacuum packaging method of a vacuum packaging machine according to claim 1, characterized in that: The specific steps include: Step 1: Place the packaging bags containing the products on the shelf plates (11), respectively, with the first hot pressing plate (27) and the second hot pressing plate (28) in an open and closed state, and place the two end portions of the packaging bags between the first hot pressing plate (27) and the second hot pressing plate (28); Step 2: close the cover plate (4), keep the box body (2) in a sealed state, control the extraction structure to operate, and perform vacuum treatment on the packaging bag inside the box body (2) until the vacuum degree inside the packaging bag meets the standard; Step 3: Control the rotary structure to work, and the shelf plate (11) performs a variable diameter circular rotation. When the shelf plate (11) moves to the upper end of the box body (2), the hot pressing structure works; Step 4: The mounting rods (26) at both ends of the shelf plate (11) rotate downward synchronously, and the mounting rods (26) respectively drive the first heat pressing plate (27) to rotate downward until it is in contact with the second heat pressing plate (28), and the open parts at both ends of the packaging bag are synchronously heat-sealed by using the first heat pressing plate (27) and the second heat pressing plate (28) after power is turned on.

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