Vacuum packaging machine

Abstract

The present invention relates to a vacuum packaging machine. The vacuum packaging machine comprises: a mounting frame and a heat sealing mechanism and a vacuum pumping mechanism arranged on the mounting frame; a guide port is arranged at one end of the mounting frame; the heat sealing mechanism comprises a heating element, a supporting element and a first driving element, the first driving element drivingly connects the heating element and / or the supporting element; the vacuum pumping mechanism comprises a first pressing body, a second pressing body, a second driving element and a vacuum pumping assembly, the second driving element drivingly connects the first pressing body and / or the second pressing body, a conveying channel is formed between the heating element and the supporting element and between the first pressing body and the second pressing body, and the vacuum pumping assembly is arranged close to the first pressing body and the second pressing body. The vacuum packaging machine has high working efficiency, is safe to use, and has a good packaging effect.

Description

Technical Field

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

[0002] In the prior art, vacuum packaging machines are mostly operated manually or semi-automatically. Specifically, when performing the operation, it is usually necessary to open the outer cover of the vacuum packaging machine, and then place the mouth of the packaging bag on the vacuum assembly to complete the vacuuming and heat sealing work. This operation method requires frequent opening and closing of the cover, which will affect work efficiency and make it difficult to ensure product hygiene. At the same time, since the vacuum packaging machine is in a continuous working state, the heat sealing mechanism will have residual temperature after each heat sealing work. In this way, when the packaging bag passes through, it will be affected by the residual temperature and cause the packaging bag to deform, thereby affecting the vacuuming operation. Furthermore, when the vacuuming mechanism finishes the vacuuming operation and performs the heat sealing operation, the residual temperature of the heat sealing mechanism itself and its working set temperature will act on the packaging bag at the same time, which will cause the problem of excessive heat sealing, thereby affecting the final packaging effect of the packaging bag. Summary of the invention

[0003] Based on this, it is necessary to provide a vacuum packaging machine with high working efficiency, safe use and good packaging effect to address the problems of low working efficiency and poor packaging effect of vacuum packaging machines in the prior art.

[0004] A vacuum packaging machine, the vacuum packaging machine comprises: a mounting frame and a heat sealing mechanism and a vacuum pumping mechanism arranged on the mounting frame; a guide port is arranged at one end of the mounting frame, and the guide port is used to convey packaging bags; the heat sealing mechanism comprises a heating element, a supporting element and a first driving element, the first driving element drivingly connects the heating element and / or the supporting element, and is used to drive the heating element and the supporting element to approach or move away from each other; the vacuum pumping mechanism comprises a first pressing body, a second pressing body, a second driving element and a vacuum pumping assembly, the second driving element drivingly connects the first pressing body and / or the second pressing body, and is used to drive the first pressing body and the second pressing body to approach each other to form a sealed cavity or the first pressing body and the second pressing body to move away from each other, a conveying channel is formed between the heating element and the supporting element and between the first pressing body and the second pressing body, the packaging bag extends into the conveying channel from the guide port, and the vacuum pumping assembly is arranged close to the first pressing body and the second pressing body, and is used to suck the sealed cavity to a vacuum state.

[0005] In one embodiment, a limiting member is provided in the conveying channel between the first pressing body and the second pressing body.

[0006] In one embodiment, a position detection element is provided in the conveying channel between the first pressing body and the second pressing body.

[0007] In one embodiment, a sealing member is provided at the edge portions where the first pressing body and the second pressing body are close to each other.

[0008] In one embodiment, the heating element is drivingly connected to the first driving element, and the supporting element is fixedly disposed on the mounting frame.

[0009] In one embodiment, the support member is drivingly connected to the first driving member, and the heating member is fixedly disposed on the installation frame.

[0010] In one embodiment, the first pressing body is drivingly connected to the second driving member, and the second pressing body is fixedly disposed on the installation frame.

[0011] In one embodiment, the second pressing body is drivingly connected to the second driving member, and the first pressing body is fixedly disposed on the installation frame.

[0012] In one embodiment, the vacuum packaging machine further comprises a guide member, wherein the guide member is arranged on one side of the installation frame and the guide opening is formed through the guide member.

[0013] In one embodiment, the guide member has inclined surfaces that are arranged opposite to each other, and the guide opening is located between the two inclined surfaces.

[0014] The above vacuum packaging machine, by providing a mounting frame with a guide port, allows the packaging bag to be directly transported to the interior of the vacuum packaging machine, further controls the first pressing body and the second pressing body to approach each other to form a sealing cavity through the second driving member of the vacuum pumping mechanism, so that the packaging bag is in the sealing cavity, and starts the vacuum pumping component to perform the vacuum pumping operation so that the sealing cavity is in a vacuum state, thereby achieving vacuum pumping of the packaging bag; then, by starting the first driving member of the heat sealing mechanism, the heating member and the supporting member are driven to approach each other, and the bag mouth of the vacuumed packaging bag is sealed under the high temperature ironing of the heating member. In this way, the coverless operation is achieved, which effectively improves the operating efficiency, and because the heat sealing mechanism and the vacuum pumping mechanism are pressed asynchronously, the vacuum pumping and heat sealing are processed separately, thereby greatly improving the vacuum pumping effect of the packaging bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The figure is a schematic diagram of the three-dimensional structure of a vacuum packaging machine according to an embodiment.

[0016] Figure 2 The figure is a schematic diagram of the internal structure of a vacuum packaging machine in an initial state according to an embodiment.

[0017] Figure 3 The figure is a schematic diagram of the internal structure of a vacuum packaging machine in a working state according to an embodiment. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0019] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right", "top", "bottom", "bottom end", "top end" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0021] In one embodiment, a vacuum packaging machine comprises: a mounting frame and a heat sealing mechanism and a vacuum pumping mechanism arranged on the mounting frame; a guide port is arranged at one end of the mounting frame, and the guide port is used to convey packaging bags; the heat sealing mechanism comprises a heating element, a supporting element and a first driving element, the first driving element drivingly connecting the heating element and / or the supporting element, and driving the heating element and the supporting element to approach or move away from each other; the vacuum pumping mechanism comprises a first pressing body, a second pressing body, a second driving element and a vacuum pumping assembly, the second driving element drivingly connecting the first pressing body and / or the second pressing body, and driving the first pressing body and the second pressing body to approach each other to form a sealed cavity or the first pressing body and the second pressing body to move away from each other, a conveying channel is formed between the heating element and the supporting element and between the first pressing body and the second pressing body, the packaging bag extends into the conveying channel from the guide port, and the vacuum pumping assembly is arranged close to the first pressing body and the second pressing body, and is used to suck the sealed cavity to a vacuum state.

[0022] The above vacuum packaging machine, by providing a mounting frame with a guide port, allows the packaging bag to be directly transported to the interior of the vacuum packaging machine, further controls the first pressing body and the second pressing body to approach each other to form a sealing cavity through the second driving member of the vacuum pumping mechanism, so that the packaging bag is in the sealing cavity, and starts the vacuum pumping component to perform the vacuum pumping operation so that the sealing cavity is in a vacuum state, thereby achieving vacuum pumping of the packaging bag; then, by starting the first driving member of the heat sealing mechanism, the heating member and the supporting member are driven to approach each other, and the bag mouth of the vacuumed packaging bag is sealed under the high temperature ironing of the heating member. In this way, the coverless operation is achieved, which effectively improves the operating efficiency, and because the heat sealing mechanism and the vacuum pumping mechanism are pressed asynchronously, the vacuum pumping and heat sealing are processed separately, thereby greatly improving the vacuum pumping effect of the packaging bag.

[0023] The vacuum packaging machine is described below in conjunction with specific embodiments to further understand the inventive concept of the vacuum packaging machine. Figure 1 and Figure 2 In one embodiment, a vacuum packaging machine 10 includes: a mounting frame 100 and a heat sealing mechanism 200 and a vacuum pumping mechanism 300 disposed on the mounting frame. The mounting frame 100 is a structure that cooperates with and fixes the heat sealing mechanism 200, the vacuum pumping mechanism 300 and other components of the vacuum packaging machine; the heat sealing mechanism 200 is a heat treatment mechanism used to iron the seal of the packaging bag; and the vacuum pumping mechanism 300 is a mechanism that extracts the packaging bag into a vacuum state. In one embodiment, the vacuum packaging machine 10 also includes a cover shell 400, and the heat sealing mechanism 200 and the vacuum pumping mechanism 300 disposed on the mounting frame 100 are both movably accommodated in the cover shell 400. That is, the heat sealing mechanism 200 and the vacuum pumping mechanism 300 are core mechanisms disposed in the cover shell 400, and they can be detached from the cover shell 400.

[0024] Specifically, a guide port 110 is provided at one end of the installation frame 100, and the guide port is used to convey the packaging bag; that is, a conveying port for conveying the packaging bag is provided on the installation frame 100, and the conveying port has a guiding effect, and the packaging bag can be conveyed to the inside of the vacuum packaging machine through the guide port. In one embodiment, the vacuum packaging machine 10 further includes a guide member 120, and the guide member 120 is provided on one side of the installation frame 100, and the guide port 110 is provided through the guide member 120. Specifically, the guide member 120 is provided inside the installation frame and close to one side of the heat sealing mechanism 200. In this way, when the packaging bag extends through the guide port of the guide member 120, it first passes through the installation position of the heat sealing mechanism 200. Further, the guide member 120 has inclined surfaces arranged opposite to each other, and the guide port 110 is located between the two opposite inclined surfaces. For example, the guide member 120 includes a fixed block with a triangular or trapezoidal cross section, and the two fixed blocks are respectively arranged on opposite sides of the mounting frame, and the guide port 110 is formed between the two fixed blocks. Furthermore, the cross section of the fixed block is a right triangle. Among them, the inclined surfaces of the two fixed blocks are formed by the hypotenuse of the right triangle. In this way, it is convenient to put the packaging bag into the guide port 110 through the triangular conveying port. In a preferred embodiment, the guide member 120 includes a conveying part 121 and a guiding part 122 connected to each other. Among them, the guiding part 122 is arranged near the guiding port 110. Among them, the conveying part is used to support the installation on the mounting frame, and the setting of the guiding part is to facilitate the packaging bag to be spread out and conveyed into the vacuum packaging machine manually or automatically along the guide port. Specifically, the guiding part is a support plate with a smooth surface. In this way, by providing a guide member with a conveying part 121 and a guide part 122, it is more convenient to quickly and smoothly convey the packaging bag into the guide port to the vacuum packaging machine, thereby eliminating the need to provide a vacuum packaging machine cover structure, and tediously conveying the packaging bag to the vacuum packaging machine by opening and closing the cover. The technical means of the present application is more conducive to improving the conveying efficiency of the packaging bag, and at the same time can ensure that the internal environment of the vacuum packaging machine is clean and free from pollution. Moreover, since the packaging bag is conveyed outside the equipment, it is safe and reliable to avoid manual opening of the cover being affected by the residual heat of the heat sealing mechanism and scalding the staff.

[0025] Specifically, the heat sealing mechanism 200 includes a heating element 210, a support element 220 and a first driving element 230, wherein the first driving element 230 is drivingly connected to the heating element 210 and / or the support element 220, and is used to drive the heating element 210 and the support element 220 to move closer or further away from each other. In one embodiment, the heating element 210 includes an energized heating wire. For example, the energized heating wire is a heating device such as an iron-soldered aluminum heating wire or a nickel-chromium heating wire. In one embodiment, the support element 230 is a supporting platform. For example, the supporting platform is a rectangular block. In one embodiment, the first driving element 230 includes a motor driving mechanism or a cylinder driving mechanism and any other mechanism that can drive the heating element 210 and the support element 220 to move closer or further away from each other. Specifically, in one embodiment, the heating element 210 is drivingly connected to the first driving element 230, and the support element 220 is fixedly arranged on the mounting frame 100. In one embodiment, the support member 220 is connected to the first driving member 230 by driving, and the heating member 210 is fixedly arranged on the installation frame 100. That is, one of the heating member 210 and the support member 220 is fixedly arranged on the installation frame 100, and the other is connected to the first driving member 230 by driving, so as to achieve the heating member 210 and the support member 220 to approach or move away from each other. When the two are close to each other, the opening of the packaging bag placed on the support member 220 is heat-sealed after being ironed by the approaching heating member 210. After the heat sealing is completed, the two are driven to separate and move away, so as to prepare for the entry and heat sealing of the next packaging bag. It should be noted that the heating member 210 and the support member 220 can also be connected to different driving members respectively to drive the two to approach or move away at the same time.

[0026] Specifically, the vacuum mechanism 300 includes a first lamination body 310, a second lamination body 320, a second driving member 330 and a vacuum assembly 340. The second driving member 330 drives and connects the first lamination body 310 and / or the second lamination body 320, and is used to drive the first lamination body 310 and the second lamination body 320 to approach each other to form a sealed cavity or the first lamination body 310 and the second lamination body 320 to move away from each other. A conveying channel 500 is formed between the heating member 210 and the supporting member 220 and between the first lamination body 310 and the second lamination body 320. The packaging bag extends into the conveying channel 500 from the guide port 110. The vacuum assembly 340 is arranged near the first lamination body 310 and the second lamination body 320, and is used to suck the sealed cavity to a vacuum state. In one embodiment, the first lamination body 310 and the second lamination body 320 are both cover structures. Preferably, the first pressing body 310 and the second pressing body 320 are both arcuate structures. Specifically, the first pressing body 310 and the second pressing body 320 are arranged vertically to each other.

[0027] Furthermore, a flexible material layer is provided on the contact surface of the first lamination body 310 and the second lamination body 320. This is conducive to forming a good sealing surface between the contact surfaces of the first lamination body 310 and the second lamination body 320 when they are close to each other and contact each other to form an integrated structure, thereby ensuring that the sealed cavity formed between the two bow-shaped first lamination bodies 310 and the second lamination bodies 320 will not be affected by air leakage during the vacuum operation. In one embodiment, a sealing member 350 is provided at the edge portion where the first lamination body 310 and the second lamination body 320 are close to each other. For example, the sealing member 350 is an elastic block. In order to ensure the stability of the sealing member setting, the elastic block is partially embedded in the first lamination body 310 and the second lamination body 320. For example, the elastic block is a sponge block or a rubber block. In this way, by providing the sealing member 350 at the edge where the first pressing body 310 and the second pressing body 320 are close to each other, it is effectively ensured that the sealing cavity formed when the two are close to each other is tightly sealed, and at the same time, the mechanical buffering force generated when the two are close to each other is effectively reduced.

[0028] The second driving member 330 includes a motor driving mechanism or a cylinder driving mechanism or any other mechanism that can drive the first pressing body 310 and the second pressing body 320 to move closer to or farther from each other. Specifically, in one embodiment, the first pressing body 310 is drivingly connected to the second driving member 330, and the second pressing body 320 is fixedly disposed on the mounting frame 100. In one embodiment, the second pressing body 320 is drivingly connected to the second driving member 330, and the first pressing body 310 is fixedly disposed on the mounting frame 100. That is, one of the first pressing body 310 and the second pressing body 320 is fixedly disposed on the mounting frame 100, and the other is drivingly connected to the second driving member 330, so as to realize that the first pressing body 310 and the second pressing body 320 move closer to or farther from each other. When the two are close to each other and in close contact, a sealed cavity is formed between the first pressing body 310 and the second pressing body 320. When it is necessary to perform a vacuum operation on the packaging bag in the sealed cavity, the vacuum assembly 340 is started to perform a vacuum operation on the sealed cavity. When the vacuum operation is completed, the first pressing body 310 and the second pressing body 320 are controlled to separate from each other through the action of the second driving member 330 to prepare for the next packaging bag to enter the vacuum. It should be noted that the first pressing body 310 and the second pressing body 320 can also be connected to different driving members to drive the two to approach or move away at the same time.

[0029] Specifically, the vacuum pumping assembly 340 includes a vacuum chamber suction pump and a vacuum chamber air pump, both of which are connected to the sealed cavity. The vacuum chamber suction pump is used to extract the air in the installation cavity where the first pressing body 310 and the second pressing body 320 are located, and make the two close to each other to form a sealed cavity. The vacuum chamber air pump is used to suck the air in the sealed cavity, so that a vacuum environment is formed in the sealed cavity, thereby sucking the packaging bag therein into a vacuum state. In one embodiment, the vacuum pumping assembly 340 also includes a suction relief valve and a vacuum relief valve, and the suction relief valve and the vacuum relief valve are respectively arranged on the first pressing body 310 and / or the second pressing body 320. In this way, by setting the suction relief valve and the vacuum relief valve, it is beneficial to release the air pressure of the corresponding cavity more quickly.

[0030] In order to control the accurate delivery of the packaging bag to the operating position, in one embodiment, a limiting member 360 is provided in the delivery channel between the first laminating body 310 and the second laminating body 320. For example, the limiting member 360 is a vertical plate. Specifically, the limiting member 360 is provided on the side of the second laminating body 320 facing the first laminating body 310. In this way, by providing the limiting member 360, when the operator is delivering the packaging bag, when the packaging bag reaches the limiting member 360, the operator can sense it and stop the delivery, thereby ensuring that the packaging bag accurately reaches the operating position where the vacuum is drawn.

[0031] In order to further accurately detect whether the packaging bag is in place, in one embodiment, a position detection member is provided in the conveying channel between the first pressing body 310 and the second pressing body 320. Among them, the position detection member is a controller used to detect the position distance in the prior art. The specific structure and principle can be found in relevant reference books, and will not be described in detail in this embodiment. For example, a sound and light alarm of the position detection member. It should be understood that by providing a position detection member in the conveying channel, when the position detection member detects that the packaging bag has reached the vacuum position, an sound and light alarm will be issued. In this way, the operator stops conveying the packaging bag after receiving the signal to determine that the packaging bag has reached the preset position. Compared with the operator's manual judgment of whether the packaging bag has reached the operating position, the judgment is more accurate and reliable.

[0032] In one embodiment, the working process of the vacuum packaging machine is as follows:

[0033] Step 1: The heating element 210 and the supporting element 220 of the heat sealing mechanism 200 are arranged to be away from each other, and the first pressing body 310 and the second pressing body 320 of the vacuuming mechanism 300 are arranged to be away from each other, and a conveying channel is formed between the heating element 210 and the supporting element 220 and between the first pressing body 310 and the second pressing body 320;

[0034] Step 2: The operator conveys the packaging bag through the guide port 110 of the installation frame 100, and the packaging bag reaches the vacuum station formed between the first lamination body 310 and the second lamination body 320 through the conveying channel;

[0035] Step 3: Start the second driving member 330 to bring the first pressing body 310 and the second pressing body 320 into contact with each other to form a sealed cavity;

[0036] Step 4: Start the vacuuming assembly 340 to vacuum the sealing cavity, so that the packaging bag in the sealing cavity is pressurized to form a vacuum packaging effect;

[0037] Step 5: Operate the second driving member 330 to release the first pressing body 310 and the second pressing body 320 so that the two move away from each other and return to their initial state positions;

[0038] Step 6: Pull the packaging bag so that it approaches the heat sealing mechanism 200 and is placed on the support member 220. Start the first driving member 230 so that the heating member 210 and the support member 220 are close to each other. The sealing end of the packaging bag is placed between the heating member and the support member. Start the heating member to heat the packaging bag. The packaging bag is heated and ironed to seal.

[0039] Step 7: Operate the first driving member 230 to release the heating member 210 and the supporting member 220 so that the two move away from each other and return to their initial positions, and continue to pull the packaging bag to the guide port to complete the vacuum packaging.

[0040] That is, the heat sealing mechanism 200 and the vacuuming mechanism 300 are independent structures, and their operation processes are performed separately. In other words, the vacuuming and heat sealing operations of the packaging bag are performed separately. Compared with the vacuum packaging machine in the traditional technology that opens and closes the heat sealing mechanism and the vacuuming mechanism at the same time, not only can the coverless operation be realized, which effectively improves the operation efficiency, but also because the heat sealing mechanism and the vacuuming mechanism are pressed asynchronously, the vacuuming and heat sealing can be processed separately, thereby greatly improving the vacuuming processing effect of the packaging bag.

[0041] The above vacuum packaging machine, by providing a mounting frame 100 with a guide port 110, allows the packaging bag to be directly transported to the interior of the vacuum packaging machine, and further controls the first pressing body 310 and the second pressing body 320 to approach each other to form a sealed cavity through the second driving member of the vacuum pumping mechanism, so that the packaging bag is in the sealed cavity, and starts the vacuum pumping assembly 340 to perform the vacuum pumping operation so that the sealed cavity is in a vacuum state, thereby achieving vacuum pumping of the packaging bag; then, by starting the first driving member 230 of the heat sealing mechanism 200, the heating member 210 and the supporting member 220 are driven to approach each other, and the bag mouth of the vacuumed packaging bag is sealed under the high temperature ironing of the heating member. In this way, the coverless operation is achieved, which effectively improves the operating efficiency, and because the heat sealing mechanism and the vacuum pumping mechanism are pressed asynchronously, the vacuum pumping and heat sealing are processed separately, thereby greatly improving the vacuum pumping effect of the packaging bag.

[0042] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A vacuum packaging machine, characterized in that: The vacuum packaging machine comprises: a mounting frame and a heat sealing mechanism and a vacuum pumping mechanism arranged on the mounting frame; A guide port is provided at one end of the installation frame, and the guide port is used to convey the packaging bag; The heat sealing mechanism comprises a heating element, a supporting element and a first driving element, wherein the first driving element is drivingly connected to the heating element and / or the supporting element, and is used to drive the heating element and the supporting element to move closer to or away from each other; The vacuum mechanism comprises a first pressing body, a second pressing body, a second driving member and a vacuum assembly, wherein the second driving member drives and connects the first pressing body and / or the second pressing body, and is used to drive the first pressing body and the second pressing body to approach each other to form a sealed cavity or the first pressing body and the second pressing body to move away from each other, a conveying channel is formed between the heating element and the supporting element and between the first pressing body and the second pressing body, and a packaging bag extends from the guide port into the conveying channel, and the vacuum assembly is arranged near the first pressing body and the second pressing body, and is used to suck the sealed cavity to a vacuum state; A sealing member is provided at the edge portions where the first pressing body and the second pressing body are close to each other; The vacuum pumping assembly includes a vacuum chamber suction pump and a vacuum chamber air pump both of which are connected to the sealing chamber; the vacuum chamber suction pump is used to extract air from the installation chamber where the first pressing body and the second pressing body are located, and make the two close to each other to form a sealing chamber; the vacuum chamber air pump is used to suck the air in the sealing chamber, so that a vacuum environment is formed in the sealing chamber, thereby sucking the packaging bag therein into a vacuum state; The working process of the vacuum packaging machine is as follows: The first step: the heating element and the supporting element of the heat sealing mechanism are arranged to be far away from each other, the first pressing body and the second pressing body of the vacuuming mechanism are arranged to be far away from each other, and a conveying channel is formed between the heating element and the supporting element and between the first pressing body and the second pressing body; Step 2: The operator conveys the packaging bag through the guide port of the installation frame, and the packaging bag passes through the conveying channel to the vacuum station formed between the first pressing body and the second pressing body; Step 3: Start the second driving member to bring the first pressing body and the second pressing body into contact with each other to form a sealed cavity; Step 4: Start the vacuum pumping component to vacuum the sealing cavity, so that the packaging bag in the sealing cavity is pressurized to form a vacuum packaging effect; Step 5: Operate the second driving member to release the first pressing body and the second pressing body, so that the two move away from each other and return to their initial state positions; Step 6: Pull the packaging bag so that it approaches the heat sealing mechanism and is placed on the support member, start the first driving member so that the heating member and the support member are close to each other, the sealing end of the packaging bag is placed between the heating member and the support member, start the heating member to heat, and the packaging bag is heated and ironed to seal; Step 7: Operate the first driving member to release the heating member and the supporting member so that the two move away from each other and return to their initial positions, continue to pull the packaging bag to the guide port, and complete the vacuum packaging.

2. The vacuum packaging machine according to claim 1, characterized in that: A limiting member is arranged in the conveying passage between the first pressing body and the second pressing body.

3. The vacuum packaging machine according to claim 1, characterized in that: A position detection component is arranged in the conveying passage between the first pressing body and the second pressing body.

4. The vacuum packaging machine according to claim 1, characterized in that: The heating element is drivingly connected to the first driving element, and the supporting element is fixedly arranged on the installation frame.

5. The vacuum packaging machine according to claim 1, characterized in that: The supporting member is drivingly connected to the first driving member, and the heating member is fixedly arranged on the installation frame.

6. The vacuum packaging machine according to claim 1, characterized in that: The first pressing body is drivingly connected to the second driving member, and the second pressing body is fixedly arranged on the installation frame.

7. The vacuum packaging machine according to claim 1, characterized in that: The second pressing body is drivingly connected to the second driving member, and the first pressing body is fixedly arranged on the installation frame.

8. The vacuum packaging machine according to claim 1, characterized in that: It also includes a guide member, which is arranged on one side of the installation frame and has the guide opening extending therethrough. 9 . The vacuum packaging machine according to claim 8 , wherein the guide member has inclined surfaces arranged opposite to each other, and the guide opening is located between the two inclined surfaces.

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