CN218806865U

CN218806865U - Vacuum packaging machine

Info

Publication number: CN218806865U
Application number: CN202222258790.6U
Authority: CN
Inventors: 潘宁宁; 虞琦凯; 张涛
Original assignee: Deli Group Co Ltd
Current assignee: Deli Group Co Ltd
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2023-04-07
Anticipated expiration: 2032-08-26

Abstract

The utility model provides a vacuum packaging machine, includes upper cover and lower cover, the rear side of upper cover is articulated mutually with the lower cover, and the front side is through locking structure and lower cover locking, its characterized in that: the locking structure comprises an iron core and an electromagnetic coil, one of the iron core and the electromagnetic coil is arranged on the upper cover, the other of the iron core and the electromagnetic coil is arranged on the lower cover, and when the upper cover and the lower cover are attracted and compressed, the iron core is embedded into the electromagnetic coil. The locking structure of the upper cover and the lower cover of the vacuum packaging machine is not easy to damage and is simple and convenient to operate.

Description

Vacuum packaging machine

Technical Field

The utility model relates to the field of packaging technology, concretely relates to vacuum packaging machine.

Background

The conventional vacuum packaging machine generally comprises an upper cover and a lower cover, wherein the rear side of the upper cover is hinged with the lower cover, the front side of the upper cover is locked with the lower cover through a locking structure, and the locking structure comprises a male buckle arranged on the upper cover and a female buckle arranged on the lower cover. The working principle of the vacuum packaging machine is as follows: during vacuumizing and heating sealing, a vacuum bag is placed between the upper cover and the lower cover, and the upper cover and the lower cover are locked through a locking structure, namely, the male buckle is fastened on the female buckle under the action of pressure; then the vacuum pump starts to work, and the packaging bag is vacuumized; after the vacuum pumping is finished, the heating wire heats the sealing part of the vacuum bag to perform the action of sealing; after the sealing is finished, the locking structure of the upper cover and the lower cover is opened by manual external force, the male buckle and the female buckle are separated, the upper cover is opened, the processed vacuum bag is taken out, and the whole process is finished.

However, the existing vacuum packaging machine has the following technical problems: because the locking firmness of the upper cover and the lower cover is ensured, and the air leakage condition is avoided during vacuum pumping, the locking structures are respectively arranged on the left side and the right side of the upper cover and the lower cover, when the upper cover is pressed by manual external force, the left hand and the right hand cannot be synchronized, so that the locking structures on the left side and the right side of the upper cover cannot be synchronized during locking, the sub-buckle and the female buckle of the locking structure are unbalanced and inclined, the sub-buckle and the female buckle of the locking structure are damaged, the locking structure can be asynchronous when being opened, and the locking structure is damaged by unbalanced acting force, so that the whole machine fails to work; in addition, the locking structure needs to be locked and unlocked repeatedly when the machine works, so that the labor intensity of workers is high.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the vacuum packaging machine is not easy to damage due to the locking structure of the upper cover and the lower cover, and is simple and convenient to operate.

The technical solution of the utility model is that: the utility model provides a vacuum packaging machine, includes upper cover and lower cover, the rear side of upper cover is articulated mutually with the lower cover, and the front side is through locking structure and lower cover locking, its characterized in that: the locking structure comprises an iron core and an electromagnetic coil, one of the iron core and the electromagnetic coil is arranged on the upper cover, the other of the iron core and the electromagnetic coil is arranged on the lower cover, and when the upper cover and the lower cover are attracted and compressed, the iron core is embedded into the electromagnetic coil.

After the structure is adopted, the utility model has the advantages of it is following:

the vacuum packaging machine is provided with the iron core and the electromagnetic coil on the upper cover and the lower cover respectively, and the upper cover and the lower cover can be attracted and compressed through electromagnetic force only by covering the upper cover, so that manual locking and buckling actions are not needed, and the locking structure is not easy to damage and is simple and convenient to operate; in addition, when the upper cover and the lower cover are arranged to be attracted and compressed, the iron core is embedded into the electromagnetic coil, so that the upper cover and the lower cover can be limited, the reliable combination of the upper cover and the lower cover is guaranteed, and the iron core is inserted into the electromagnetic coil, so that the attraction area between the upper cover and the lower cover is larger, the attraction force is larger, and the locking of the upper cover and the lower cover is firmer and more reliable.

Preferably, the upper cover has a first installation cavity, the lower cover has a second installation cavity, an iron core installation cavity is established to the downward protruding bottom of the first installation cavity of upper cover, the iron core is installed in the iron core installation cavity, the top of the second installation cavity of lower cover is equipped with the opening that makes the iron core installation cavity pass through, solenoid installs in the second installation cavity of lower cover and is located the opening part, when the upper cover compresses tightly with the lower cover actuation the iron core installation cavity is embedded into the opening part. The arrangement can facilitate the installation of the iron core and the electromagnetic coil, and the iron core can be reliably embedded into the electromagnetic coil.

Preferably, the bottom of the first mounting cavity of the upper cover is further provided with an upper concave vacuum cavity, the top of the second mounting cavity of the lower cover is further provided with a lower concave vacuum cavity, when the upper cover and the lower cover are attracted and pressed tightly, the upper vacuum cavity and the lower vacuum cavity are spliced to form an air pumping cavity, upper air sealing cotton is arranged in the upper vacuum cavity and positioned at the edge in a surrounding manner, and lower air sealing cotton is arranged in the lower vacuum cavity and positioned at the edge in a surrounding manner. The pumping cavity has reasonable structural design and can realize reliable sealing.

Preferably, the upper vacuum cavity is connected with the upper cover in an up-and-down sliding mode through an up-and-down guide structure, the upper vacuum cavity and the upper cover are respectively provided with a first magnet and a second magnet, the first magnet and the second magnet are arranged up and down, and the polarities of the first magnet and the second magnet are repulsive, so that when the upper cover and the lower cover are attracted and pressed, the upper air-sealing cotton of the upper vacuum cavity is driven by the repulsive force of the first magnet and the second magnet to press the lower air-sealing cotton of the lower vacuum cavity tightly, and the air exhaust cavity is closed. The upper vacuum cavity capable of sliding up and down is arranged, and the repulsive first magnet and second magnet are utilized to provide pressing force for the upper air-sealing cotton and the lower air-sealing cotton, so that even if the sizes of the upper air-sealing cotton and the lower air-sealing cotton have certain errors, the upper air-sealing cotton and the lower air-sealing cotton can be reliably sealed by adjusting the displacement of the upper vacuum cavity, and the size precision requirement of the air-sealing cotton is reduced by the structure; in addition, because the upper cover and the lower cover and the upper vacuum cavity and the upper cover are not in hard connection but are connected together through electromagnetic force, when the air-tight cover is not used, the upper cover and the lower cover are not pressed due to the fact that the electromagnetic coil is powered off, deformation of the air-tight cotton is small, deformation recovery time is short, the service life of the air-tight cotton can be prolonged, the electromagnetic force connection has a certain buffering effect, the upper air-tight cotton and the lower air-tight cotton can be better attached, and the service life of the air-tight cotton is further prolonged.

Preferably, the upper and lower guide structure comprises a chute vertically arranged in the first mounting cavity of the upper cover and a sliding block arranged on the side surface of the upper vacuum cavity, the top end of the chute is open, the bottom end of the chute is closed, and the sliding block of the upper vacuum cavity is arranged on the chute of the first mounting cavity from top to bottom. This upper and lower guide structure is very simple, and sets up the open-top of spout, can conveniently install the vacuum cavity in the first installation cavity of upper cover, and the bottom that sets up the spout is sealed, can prevent to go up the vacuum cavity and drop in the first installation cavity of upper cover.

Preferably, the four sliding blocks are respectively arranged at the front, the rear, the left and the right of the upper vacuum cavity, and the four sliding grooves are also arranged and correspond to the positions of the sliding blocks. The arrangement can make the up-and-down movement of the upper vacuum cavity stable and reliable.

Preferably, the upper cover includes a first cover body and a second cover body which are covered by the upper cover and the lower cover, a first mounting cavity is formed between the first cover body and the second cover body, the lower cover includes a third cover body and a fourth cover body which are covered by the upper cover and the lower cover, and a second mounting cavity is formed between the third cover body and the fourth cover body. The upper cover and the lower cover are both arranged into two cover bodies which are covered by the upper cover and the lower cover, so that the installation of internal parts can be facilitated.

Preferably, the top of the first installation cavity is provided with a first through hole, the top of the upper vacuum cavity is provided with a second through hole, the first installation cavity is further internally provided with a pressure relief lever, one end of the pressure relief lever is provided with a pressure relief button matched with the first through hole, the other end of the pressure relief lever is provided with a pressure relief plug matched with the second through hole, one end of the pressure relief lever provided with the pressure relief button is further provided with an elastic piece, the elastic piece is arranged between the bottom of the pressure relief lever and the top of the upper vacuum cavity and used for enabling the pressure relief button and the pressure relief plug to plug the first through hole and the second through hole under a natural state, and the pressure relief button and the pressure relief plug are enabled to open the first through hole and the second through hole when the pressure relief button is pressed. Because the wrapping bag has also carried out the evacuation when sealing, when sealing the action and accomplishing the back, because the effect of inside vacuum negative pressure for upper cover and lower cover are hardly separated, and the design of above-mentioned structure can be after sealing the completion, through pressing the pressure release button, make the outside gas enter into the exhaust chamber through first installation cavity in, treat atmospheric pressure balanced back, can conveniently open the upper cover and take out the wrapping bag.

Preferably, the pressure relief lever comprises a supporting seat, a rotating shaft and a rod piece, the supporting seat is arranged in the first installation cavity and located at the top of the upper vacuum cavity, the rotating shaft is rotatably connected to the supporting seat, and the rod piece is fixed with the rotating shaft. The lever has simple structure and reasonable layout.

Preferably, the pressure relief plug is made of a flexible material. The arrangement can ensure that the pressure relief plug is more tightly matched with the second through hole of the upper vacuum cavity.

Description of the drawings:

fig. 1 is a schematic view of the structure of a vacuum packing machine in embodiment 1;

fig. 2 is a schematic structural view of an upper cover of the vacuum packing machine in embodiment 1;

fig. 3 is a schematic view showing the construction of a lower cover of the vacuum packing machine in embodiment 1;

fig. 4 is a plan view of the vacuum packing machine in embodiment 1;

FIG. 5 isbase:Sub>A cross-sectional view taken at A-A' of FIG. 4;

FIG. 6 is a cross-sectional view taken at B-B' of FIG. 4;

fig. 7 is a schematic view showing an inner structure of an upper cover of the vacuum packing machine in embodiment 1;

fig. 8 is a schematic view showing the construction of the vacuum packing machine of embodiment 2;

fig. 9 is a plan view of the vacuum packing machine in embodiment 2;

FIG. 10 is a cross-sectional view at C-C' of FIG. 9;

FIG. 11 is a cross-sectional view taken at D-D' of FIG. 9;

FIG. 12 is an enlarged partial view of FIG. 11 at E;

fig. 13 is a schematic view showing an inner structure of an upper cover of the vacuum packing machine in embodiment 2;

in the figure: 1-upper cover, 2-lower cover, 3-locking structure, 4-iron core, 5-electromagnetic coil, 6-first installation cavity, 7-second installation cavity, 8-iron core installation cavity, 9-opening, 10-upper vacuum cavity, 11-lower vacuum cavity, 12-sealing hold-down strip, 13-upper air-sealing cotton, 14-lower air-sealing cotton, 15-upper and lower guide structure, 16-first magnet, 17-second magnet, 18-chute, 19-slider, 20-first cover body, 21-second cover body, 22-third cover body, 23-heating wire, 24-fourth cover body, 25-first through hole, 26-second through hole, 27-pressure relief lever, 28-pressure relief button, 29-pressure relief, 30-elastic piece, 31-support seat, 32-rotating shaft and 33-rod piece.

Detailed Description

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

Example 1:

as shown in fig. 1 to 7, this embodiment provides a vacuum packaging machine, which includes an upper cover 1 and a lower cover 2, the rear side of the upper cover 1 is hinged to the lower cover 2, the front side is locked to the lower cover 2 through a locking structure 3, the locking structure 3 includes an iron core 4 and an electromagnetic coil 5, one of the iron core 4 and the electromagnetic coil 5 is disposed on the upper cover 1, the other is disposed on the lower cover 2, and when the upper cover 1 and the lower cover 2 are sucked and pressed, the iron core 4 is embedded into the electromagnetic coil 5.

The upper cover 1 has a first installation cavity 6, the lower cover 2 has a second installation cavity 7, an iron core installation cavity 8 is arranged downwards and convexly at the bottom of the first installation cavity 6 of the upper cover 1, the iron core 4 is installed in the iron core installation cavity 8, an opening 9 for enabling the iron core installation cavity 8 to pass through is arranged at the top of the second installation cavity 7 of the lower cover 2, the electromagnetic coil 5 is installed in the second installation cavity 7 of the lower cover 2 and is located at the opening 9, and when the upper cover 1 is tightly pressed with the lower cover 2, the iron core installation cavity 8 is embedded into the opening 9.

The bottom of the first mounting cavity 6 of the upper cover 1 is also provided with an upper concave vacuum cavity 10, the top of the second mounting cavity 7 of the lower cover 2 is also provided with a lower concave vacuum cavity 11, when the upper cover 1 and the lower cover 2 are sucked and pressed tightly, the upper vacuum cavity 10 and the lower vacuum cavity 11 are spliced to form an air pumping cavity, upper air-sealing cotton 13 is annularly arranged in the upper vacuum cavity 10 and positioned at the edge, and lower air-sealing cotton 14 is annularly arranged in the lower vacuum cavity 11 and positioned at the edge; the upper vacuum cavity 10 is connected with the upper cover 1 in an up-and-down sliding manner through an upper guide structure 15, the upper vacuum cavity 10 and the upper cover 1 are respectively provided with a first magnet 16 and a second magnet 17, the first magnet 16 and the second magnet 17 are arranged up and down and have repulsive polarities, and the upper vacuum cavity 10 and the lower cover 2 are used for driving the upper air-sealing cotton 13 of the upper vacuum cavity 10 to compress the lower air-sealing cotton 14 of the lower vacuum cavity 11 to seal the air-extracting cavity when the upper cover 1 and the lower cover 2 are attracted and pressed tightly by utilizing the repulsive force of the first magnet 16 and the second magnet 17; the upper and lower guide structure 15 comprises a chute 18 vertically arranged in the first mounting chamber 6 of the upper cover 1 and a slide block 19 arranged on the side surface of the upper vacuum cavity 10, the top end of the chute 18 is provided with an opening 9, the bottom end of the chute is closed, and the slide block 19 of the upper vacuum cavity 10 is arranged on the chute 18 of the first mounting chamber 6 from top to bottom; the four sliding blocks 19 are respectively arranged at the front, the rear, the left and the right of the upper vacuum cavity 10, and the four sliding grooves 18 are also arranged and correspond to the sliding blocks 19.

The upper cover 1 comprises a first cover body 20 and a second cover body 21 which are combined by an upper cover 2 and a lower cover 2, a first mounting cavity 6 is formed between the first cover body 20 and the second cover body 21, the lower cover 2 comprises a third cover body 22 and a fourth cover body 24 which are combined by the upper cover 2 and the lower cover 2, and a second mounting cavity 7 is formed between the third cover body 22 and the fourth cover body 24.

A heating wire 23 is also embedded in the lower cover 2, and a sealing pressing strip 12 corresponding to the heating wire 23 is also embedded in the upper cover 1; in this embodiment, the heating wire 23 is disposed at the front side of the lower vacuum chamber 11, and the electromagnetic coils 5 are disposed at the left and right sides of the heating wire 23.

The working principle of the vacuum packaging machine of the embodiment is as follows:

opening the upper cover 1, placing a packaging bag between the upper cover 1 and the lower cover 2, switching on the electromagnetic coil 5, leading the upper cover 1 and the lower cover 2 to be pressed and attracted because the iron core 4 of the upper cover 1 is subjected to the electromagnetic attraction of the electromagnetic coil 5 of the lower cover 2, and splicing an upper vacuum cavity 10 arranged on the upper cover 1 and a lower vacuum cavity 11 arranged on the lower cover 2 to form an air-pumping cavity after the upper cover 1 and the lower cover 2 are pressed and attracted; meanwhile, the first magnet 16 arranged on the upper vacuum cavity 10 is subjected to the electromagnetic repulsion force of the second magnet 17 on the upper cover 1, so that the upper vacuum cavity 10 is pressed down along the up-and-down guide structure 15, and thus the upper air-sealing cotton 13 arranged in the upper vacuum cavity 10 presses the lower air-sealing cotton 14 in the lower vacuum cavity 11, so that the extraction cavity is well sealed; then, the packaging bag is vacuumized through the air pumping chamber, air or liquid in the packaging bag is pumped out in the process, and when certain negative pressure is reached, the sealing pressing strip 12 is matched with the heating wire 23 to complete the sealing action; after the sealing action is finished, the machine stops working, the electromagnetic coil 5 is powered off, the upper cover 1 is opened, and the packaging bag is taken out.

Example 2:

as shown in fig. 8-13, and with reference to fig. 2 and 3, the present embodiment provides a vacuum packaging machine, which includes an upper cover 1 and a lower cover 2, a rear side of the upper cover 1 is hinged to the lower cover 2, a front side is locked to the lower cover 2 by a locking structure 3, the locking structure 3 includes an iron core 4 and an electromagnetic coil 5, one of the iron core 4 and the electromagnetic coil 5 is disposed on the upper cover 1, the other is disposed on the lower cover 2, and when the upper cover 1 and the lower cover 2 are attracted and pressed, the iron core 4 is embedded into the electromagnetic coil 5.

The bottom of the first mounting cavity 6 of the upper cover 1 is also provided with an upper concave vacuum cavity 10, the top of the second mounting cavity 7 of the lower cover 2 is also provided with a lower concave vacuum cavity 11, when the upper cover 1 and the lower cover 2 are sucked and pressed tightly, the upper vacuum cavity 10 and the lower vacuum cavity 11 are spliced to form an air exhaust cavity, upper air sealing cotton 13 is annularly arranged in the upper vacuum cavity 10 and positioned at the edge, and lower air sealing cotton 14 is annularly arranged in the lower vacuum cavity 11 and positioned at the edge.

A first through hole 25 is formed in the top of the first mounting chamber 6, a second through hole 26 is formed in the top of the upper vacuum chamber 10, a pressure release lever 27 is further arranged in the first mounting chamber 6, a pressure release button 28 matched with the first through hole 25 is arranged at one end of the pressure release lever 27, a pressure release plug 29 matched with the second through hole 26 is arranged at the other end of the pressure release lever 27, an elastic member 30 is further arranged at one end of the pressure release lever 27 provided with the pressure release button 28, the elastic member 30 is arranged between the bottom of the pressure release lever 27 and the top of the upper vacuum chamber 10 and used for enabling the pressure release button 28 and the pressure release plug 29 to plug the first through hole 25 and the second through hole 26 in a natural state and enabling the pressure release button 28 and the pressure release plug 29 to open the first through hole 25 and the second through hole 26 when the pressure release button 28 is pressed, and the elastic member 30 is a compression spring in the embodiment; the pressure relief lever 27 comprises a supporting seat 31, a rotating shaft 32 and a rod piece 33, the supporting seat 31 is arranged in the first mounting chamber 6 and is positioned at the top of the upper vacuum cavity 10, the rotating shaft 32 is rotatably connected to the supporting seat 31, and the rod piece 33 is fixed with the rotating shaft 32; the pressure relief plug 29 is made of a flexible material.

The working principle of the vacuum packaging machine of the embodiment is as follows: opening the upper cover 1, placing the packaging bag between the upper cover 1 and the lower cover 2, switching on the electromagnetic coil 5, and enabling the upper cover 1 and the lower cover 2 to be pressed and attracted due to the fact that the iron core 4 of the upper cover 1 is subjected to the electromagnetic attraction of the electromagnetic coil 5 of the lower cover 2; after the upper cover 1 and the lower cover 2 are pressed and attracted, an upper vacuum cavity 10 arranged on the upper cover 1 and a lower vacuum cavity 11 arranged on the lower cover 2 are spliced to form an air pumping cavity, and meanwhile, an upper air sealing cotton 13 arranged in the upper vacuum cavity 10 presses a lower air sealing cotton 14 in the lower vacuum cavity 11 to seal the air pumping cavity; then, the packaging bag is vacuumized through the air pumping chamber, air or liquid in the packaging bag is pumped out in the process, and when certain negative pressure is reached, the sealing pressing strip 12 is matched with the heating wire 23 to complete the sealing action; after the sealing action is finished, the machine stops working, the electromagnetic coil 5 is powered off, then the pressure relief button 28 is pressed down, the pressure relief button 28 and the pressure relief plug 29 open the first through hole 25 and the second through hole 26, so that external gas enters the air suction cavity through the first mounting cavity 6 of the upper cover 1, and after the air pressure is balanced, the upper cover 1 can be conveniently opened and the packaging bag can be taken out.

Claims

1. The utility model provides a vacuum packaging machine, includes upper cover (1) and lower cover (2), the rear side of upper cover (1) is articulated mutually with lower cover (2), and the front side is through locking structure (3) and lower cover (2) locking, its characterized in that: the locking structure (3) comprises an iron core (4) and an electromagnetic coil (5), one of the iron core (4) and the electromagnetic coil (5) is arranged on the upper cover (1), the other of the iron core and the electromagnetic coil is arranged on the lower cover (2), and when the upper cover (1) and the lower cover (2) are attracted and pressed, the iron core (4) is embedded into the electromagnetic coil (5).

2. The vacuum packaging machine as claimed in claim 1, wherein: upper cover (1) has first installation cavity (6), lower cover (2) has second installation cavity (7), the bottom of first installation cavity (6) of upper cover (1) is protruding downwards and is established an iron core installation cavity (8), install in iron core installation cavity (8) iron core (4), the top of second installation cavity (7) of lower cover (2) is equipped with opening (9) that make iron core installation cavity (8) pass through, solenoid (5) are installed in second installation cavity (7) of lower cover (2) and are located opening (9) department, when upper cover (1) and lower cover (2) actuation compress tightly iron core installation cavity (8) are embedded into opening (9) department.

3. A vacuum packaging machine as claimed in claim 2, characterized in that: the bottom of the first installation cavity (6) of the upper cover (1) is further provided with an upper concave vacuum cavity (10), the top of the second installation cavity (7) of the lower cover (2) is further provided with a lower concave vacuum cavity (11), when the upper cover (1) and the lower cover (2) are attracted and compressed, the upper vacuum cavity (10) and the lower vacuum cavity (11) are spliced to form an air pumping cavity, upper air sealing cotton (13) is arranged in the upper vacuum cavity (10) and located at the edge in a surrounding mode, and lower air sealing cotton (14) is arranged in the lower vacuum cavity (11) and located at the edge in a surrounding mode.

4. A vacuum packaging machine as claimed in claim 3, characterized in that: the upper vacuum cavity (10) is connected with the upper cover (1) in a vertical sliding mode through an upper guide structure (15) and a lower guide structure (15), the upper vacuum cavity (10) and the upper cover (1) are respectively provided with a first magnet (16) and a second magnet (17), the first magnet (16) and the second magnet (17) are arranged vertically and have repulsive polarities, and the upper vacuum cavity and the lower vacuum cavity are used for driving upper air-sealing cotton (13) of the upper vacuum cavity (10) to compress lower air-sealing cotton (14) of the lower vacuum cavity (11) to seal the air exhaust cavity by utilizing the repulsive force of the first magnet (16) and the second magnet (17) when the upper cover (1) and the lower cover (2) are attracted and compressed.

5. The vacuum packaging machine according to claim 4, wherein: the upper and lower guide structure (15) comprises a sliding groove (18) vertically arranged in the first mounting cavity (6) of the upper cover (1) and a sliding block (19) arranged on the side surface of the upper vacuum cavity (10), the top end opening (9) and the bottom end of the sliding groove (18) are closed, and the sliding block (19) of the upper vacuum cavity (10) is arranged on the sliding groove (18) of the first mounting cavity (6) from top to bottom.

6. The vacuum packaging machine as claimed in claim 5, wherein: the four sliding blocks (19) are respectively positioned at the front, the rear, the left and the right of the upper vacuum cavity (10), and the four sliding grooves (18) are also arranged and correspond to the sliding blocks (19).

7. The vacuum packaging machine as claimed in claim 2, wherein: the upper cover (1) comprises a first cover body (20) and a second cover body (21) which are combined by an upper cover body and a lower cover body (2), a first installation cavity (6) is formed between the first cover body (20) and the second cover body (21), the lower cover (2) comprises a third cover body (22) and a fourth cover body (24) which are combined by the upper cover body and the lower cover body (2), and a second installation cavity (7) is formed between the third cover body (22) and the fourth cover body (24).

8. A vacuum packaging machine as claimed in claim 3, characterized in that: the top of first installation cavity (6) is equipped with first through-hole (25), the top of going up vacuum cavity (10) is equipped with second through-hole (26), still be equipped with a pressure release lever (27) in first installation cavity (6), the one end of pressure release lever (27) is equipped with pressure release button (28) with first through-hole (25) matched with, and the other end is equipped with pressure release end cap (29) with second through-hole (26) matched with, the one end that pressure release lever (27) was equipped with pressure release button (28) still is equipped with one elastic component (30), elastic component (30) set up between the bottom of pressure release lever (27) and the top of last vacuum cavity (10) for make pressure release button (28) and pressure release end cap (29) plug up first through-hole (25) and second through-hole (26) under natural state, and make pressure release button (28) and end cap (29) open first through-hole (25) and second through-hole (26) when pressure release button (28) is pressed.

9. The vacuum packaging machine according to claim 8, wherein: pressure release lever (27) are including supporting seat (31), pivot (32) and member bar (33), supporting seat (31) set up in first installation cavity (6) and are located the top of last vacuum cavity (10), pivot (32) rotate to be connected on supporting seat (31), member bar (33) are fixed with pivot (32).

10. The vacuum packaging machine as claimed in claim 8, wherein: the pressure relief plug (29) is made of flexible material.