Food vacuum packaging and preservation equipment and method of use thereof

Abstract

The present application relates to the technical field of vacuum packaging, in particular to a food vacuum packaging and fresh-keeping equipment and a use method thereof. The equipment comprises a support frame, a shell, a sealing assembly, a supporting assembly, a negative pressure machine and an electric push rod two. The support frame is provided with the shell on the top. The support plate of the shell is used for placing a vacuum bag. The shell is internally provided with the sealing assembly and the supporting assembly. The supporting assembly penetrates the sealing assembly. The supporting assembly comprises two drive rods. The drive rods are rotatably connected with two connecting rods at the ends. The connecting rods are rotatably connected with support rods at the ends. The drive rods, the connecting rods and the support rods are internally provided with air channels in communication. The rear end of the drive rod is provided with an air outlet in communication with the air channel. The support rods of the supporting assembly are unfolded to support the food area of the vacuum bag. The two heat seals of the sealing assembly are matched. The air is drawn in steps through the air channels. The two-step air extraction packaging is realized, that is, the air outside the food is extracted first and then the air in the food area is extracted. The food is not directly squeezed throughout the process.

Description

Technical Field

[0001] This invention relates to the field of vacuum packaging technology, and more specifically, to a food vacuum packaging and preservation device and its usage method. Background Technology

[0002] In the food processing industry, vacuum packaging is a widely used and crucial food preservation and packaging technology. Food is placed in a vacuum bag, the air inside is removed, and the bag is sealed, thus isolating it from harmful substances such as oxygen, moisture, and bacteria. This extends the shelf life and freshness of the food, preventing contamination and damage during storage, transportation, and sales. Furthermore, vacuum packaging reduces the volume of food, facilitating storage and transportation, lowering storage and transportation costs, and improving the appearance and added value of the food. It is suitable for processing and packaging various types of food, including meat, fruits and vegetables, cooked food, soy products, and seafood, and is a key technology for ensuring food quality and safety and promoting the large-scale development of food processing.

[0003] Currently, most existing food vacuum sealing equipment adopts a direct air extraction structure. By placing a vacuum bag containing food inside the equipment, the air inside the vacuum bag is completely and quickly extracted by the air extraction device. After the specified vacuum level is reached inside the bag, the opening end of the vacuum bag is heat-sealed.

[0004] However, due to the negative pressure formed inside the bag during the vacuuming process, the vacuum bag will directly squeeze the food inside the bag tightly. For foods containing soup or water (such as cooked food, seafood, fruits and vegetables, etc.), this squeezing action will cause the soup or water inside the food to be squeezed out, resulting in juice leakage.

[0005] Squeezed-out broth can contaminate the inner wall of the vacuum bag and the equipment, increasing the workload of equipment cleaning. It may also cause the vacuum bag to not seal properly, resulting in air leakage, which in turn affects the shelf life of food. Furthermore, the broth that leaks out can form liquid inside the vacuum bag, which can easily breed bacteria, accelerate food spoilage, and pose food safety risks. It cannot meet the requirements of high-quality food packaging and seriously restricts the application of vacuum packaging technology in various food processing. Summary of the Invention

[0006] This invention provides a food vacuum sealing and preservation device and its usage method. It uses a support component to expand and support the food area of ​​the vacuum bag, combined with a sealing component for two heat seals and step-by-step air extraction through the air duct. This achieves a two-step air extraction and sealing process, first removing air from outside the food and then removing air from the food area. The food is not directly squeezed throughout the process, thus solving the problems mentioned in the background art, such as food leakage, quality degradation, poor sealing, and food safety hazards caused by direct and complete air extraction in existing equipment.

[0007] To achieve the above objectives, the food vacuum sealing and preservation equipment and its usage method include a support frame, a housing, a sealing component, a support component, a negative pressure unit, and an electric push rod. The housing is installed on the top of the support frame, and a vacuum bag is placed on the support plate of the housing. The sealing component and the support component are installed inside the housing, and the support component penetrates the sealing component.

[0008] The support assembly includes two drive rods, with two connecting rods rotatably connected to the ends of the drive rods, and a support rod rotatably connected to the ends of the connecting rods. The drive rods, connecting rods, and support rods are provided with interconnected air passages, and the rear end of the drive rods is provided with an air extraction port communicating with the air passages.

[0009] The sealing assembly includes two vertically distributed heat-sealing strips 1 and 2 vertically distributed heat-sealing strips 2. The heat-sealing strips 1 have openings on their opposite sides for limiting the sliding of the drive rods. Multiple electric push rods 1 are installed inside the housing to drive the opening and closing of the heat-sealing strips 1 and 2. Support blocks slide on both sides of the outer wall of the drive rods. Connecting brackets 2 are connected between the multiple support blocks. Connecting brackets 1 are connected between the two drive rods. The telescopic end of the electric push rods 2 installed inside the housing passes through the through hole of the connecting brackets 1 and connects to the connecting brackets 2.

[0010] A negative pressure unit is installed inside the housing, and the suction end of the negative pressure unit is connected to the suction port through an air pipe. Its usage method includes the following steps: placing the vacuum bag, unfolding the support rod, first heat sealing, first step of suction, retracting and merging the support rod, second step of suction, and second heat sealing.

[0011] A method for using a food vacuum sealing and preservation device includes the following steps: S1. Place the vacuum bag on the support plate of the shell, and position the area of ​​the food to be packaged inside the vacuum bag between the two support rods. The open end of the vacuum bag passes through heat sealing strip one and heat sealing strip two in sequence. S2. Drive the two drive rods to extend axially, causing the two connecting rods at the ends of each drive rod to rotate relative to each other, thereby driving the two support rods to unfold in parallel and opening the bag body inside the vacuum bag corresponding to the food area. S3. Control the heat sealing strip to close and perform the first heat sealing on the opening end of the vacuum bag. The opening on the heat sealing strip has an unsealed area because it accommodates the drive rod. S4. Evacuate the air inside the vacuum bag through the air extraction port and the connected air passage, first removing the air outside the food area inside the vacuum bag. S5. Drive the two drive rods to retract, causing the two connecting rods to rotate in opposite directions and drive the two support rods to move closer together. During the merging process, continue to draw air through the air passage to gradually remove the air from the food area. S6. After the drive rod has completely retracted from heat-sealing strip one and heat-sealing strip two, control heat-sealing strip two to close, performing a second heat seal on the opening end of the vacuum bag, completely sealing the entire opening end, including the previously unsealed area. In the above technical solution, the support component is the core of supporting the food area and avoiding compression. By extending and retracting the drive rod, the connecting rod and the support rod can be opened or merged, which can not only open the food area of ​​the vacuum bag to form a support space, but also achieve step-by-step air extraction through the internal air channel.

[0012] The double heat sealing of the sealing component, combined with the expansion and contraction of the support component, achieves the linkage between the air extraction at the opening and the sealing of the opening, ensuring a tight seal; the pure structural linkage between electric push rod one and electric push rod two, the support component, and the sealing component enables the automatic drive of the entire process of the equipment without the need for manual intervention. The negative pressure machine, in conjunction with the air duct, enables precise, step-by-step removal of air from the vacuum bag, preventing direct compression of the food throughout the process and fundamentally solving the problem of juice leakage.

[0013] Based on the above, this equipment achieves automatic drive through linkage, realizing full automation of the vacuum sealing process, greatly improving sealing efficiency and consistency. Through the coordinated design of two-step air extraction and two-stage heat sealing, it ensures that the vacuum bag reaches the specified vacuum level to guarantee the preservation effect, while completely avoiding direct compression of food and eliminating juice leakage, thus taking into account food quality, food safety and packaging integrity.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: By using a support component in conjunction with a sealing component, and employing an electric push rod to extend and retract the drive rod, the connecting rod and support rod are opened or closed. When the support rod is opened, it expands the food area of ​​the vacuum bag to form a support space. In conjunction with the first heat seal opening of the sealing component, air is first extracted from the food area through the air passage. Then, the drive rod retracts, causing the support rod to close. During the closing process, air is continued to be extracted from the food area through the air passage. Finally, the second heat seal of the sealing component achieves a full-opening seal. This achieves two-step sealing without directly compressing the food, solving a series of problems caused by direct full air extraction in existing equipment, such as food leakage, nutrient loss, deterioration in taste, poor sealing, food safety hazards, and food damage. At the same time, it achieves full-process automatic drive, improving sealing efficiency and standardization. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 3 This is a schematic diagram showing the placement of the vacuum bag according to the present invention; Figure 4 This is an enlarged structural schematic diagram of the sealing assembly of the present invention; Figure 5 for Figure 3 A diagram from another perspective; Figure 6 This is an exploded structural diagram of the support component of the present invention; Figure 7 This is a schematic diagram of the structure of the support component of the present invention when it is deployed; Figure 8 This is a schematic diagram of the first step of the present invention: air extraction. Figure 9 This is a schematic diagram of the first step of the support component retraction in this invention; Figure 10 This is a schematic diagram of the second step of the support component retraction in this invention; Figure 11 This is a schematic diagram of the third step of the support component retraction in this invention; Figure 12 This is a schematic cross-sectional view of the airway structure of the present invention; Figure 13 This is a schematic diagram of the second step of air extraction in this invention; Figure 14 This is a structural schematic diagram of the fourth step of the support component retraction in this invention; Figure 15 This is a schematic diagram of the second heat sealing of the sealing assembly of the present invention; Figure 16 This is a schematic diagram illustrating the completion of vacuum packaging of food according to the present invention.

[0016] The meanings of the labels in the diagram are as follows: 1. Support frame; 2. Housing; 3. Sealing assembly; 31. Heat sealing strip one; 31.1. Opening; 32. Heat sealing strip two; 33. Electric push rod one; 4. Support assembly; 41. Drive rod; 42. Connecting rod; 43. Support rod; 44. Air extraction port; 45. Air passage; 46. Connecting frame one; 47. Support block; 48. Connecting frame two; 5. Negative pressure unit; 6. Electric push rod two. Detailed Implementation

[0017] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0018] Because existing food vacuum sealing equipment uses air extraction, the negative pressure inside the bag during the extraction process directly causes the vacuum bag to squeeze the food, resulting in the leakage of juices and water from the food. This leads to problems such as nutrient loss, poor taste, inadequate sealing, equipment contamination, food safety hazards, and food damage. Therefore, in view of the above-mentioned problems, this invention provides a food vacuum sealing and preservation equipment and its usage method.

[0019] refer to Figure 1-2 As shown, the present invention provides a food vacuum sealing and preservation device, including a support frame 1, which serves as the bottom support component of the entire device. A housing 2 is installed on the top of the support frame 1, and the housing 2 provides a stable installation space for components such as the sealing component 3, the support component 4, the negative pressure unit 5, and the electric push rod 6.

[0020] The housing 2 has an internal support plate, and a vacuum bag is placed on top of the support plate. Food is located inside the vacuum bag, such as... Figure 3 As shown, the support plate has a smooth and flat surface, which can provide a stable platform for placing vacuum bags.

[0021] For details, please refer to the following: Figure 4 As shown, the housing 2 is equipped with a sealing component 3 and a support component 4. The support component 4 passes through the sealing component 3. The two work together. The sealing component 3 is responsible for the two heat seals at the opening of the vacuum bag, while the support component 4 is responsible for opening the food area of ​​the vacuum bag, preventing compression, and assisting in air extraction.

[0022] The sealing assembly 3 includes two vertically distributed heat-sealing strips 31 installed at the port of the housing 2. Two vertically distributed heat-sealing strips 32 are installed on the front side of the heat-sealing strips 31. The heat-sealing strips 31 and 32 melt and seal the opening of the vacuum bag by heating and pressing, ensuring the airtightness of the vacuum bag. The two heat-sealing strips 31 and 32 are arranged correspondingly and distributed front and back. With the expansion and contraction of the support assembly 4, the first opening is left open for air extraction and the second opening is sealed in stages.

[0023] Multiple electric push rods 33 are installed inside the housing 2. The lower heat-sealing strip 31 is fixed inside the housing 2, and the upper heat-sealing strip 31 is connected to the telescopic end of the corresponding electric push rod 33. The telescopic movement of the electric push rod 33 drives the upper heat-sealing strip 31 to move up and down. The lower and upper heat-sealing strips 32 are respectively connected to the telescopic ends of the corresponding electric push rods 33. The synchronous telescopic movement of the electric push rods 33 drives the upper and lower heat-sealing strips 32 to open and close synchronously, ensuring the sealing accuracy of the heat-sealing strips 32. The telescopic speed and telescopic amount of the electric push rods 33 can be precisely adjusted, and the heat-sealing pressure and heat-sealing time can be flexibly adjusted according to the thickness and material of the vacuum bag to ensure the sealing effect.

[0024] Before use, the food must be placed in a vacuum bag and then placed on the support plate of the housing 2, with the food positioned between the two support components 4. Figure 5 As shown, this placement method ensures that when the support rod 43 is unfolded, it can accurately open the vacuum bag in the food area, providing a stable support space for the food.

[0025] Among them, reference Figure 6 As shown, the support assembly 4 includes two drive rods 41, the ends of which are rotatably connected to two connecting rods 42, and the ends of the connecting rods 42 are rotatably connected to a support rod 43. The support rod 43 opens up the vacuum bag components to form a support space, preventing the vacuum bag from squeezing the food during vacuuming. At the same time, the end face of the support rod 43 is provided with a vacuum hole, which works with the air passage 45 to realize the vacuuming operation.

[0026] The drive rod 41 and the connecting rod 42, as well as the connecting rod 42 and the support rod 43, are rotatably connected through ear plates and connecting shafts, ensuring that the extension and retraction of the drive rod 41 can be smoothly transmitted to the connecting rod 42 and the support rod 43.

[0027] When the drive rod 41 extends axially, the two connecting rods 42 rotate relative to each other and drive the two support rods 43 to unfold in parallel to open the vacuum bag. When the drive rod 41 retracts, the two connecting rods 42 rotate in opposite directions and drive the two support rods 43 to move closer together. When the support rods 43 unfold in parallel, they can evenly support both sides of the vacuum bag, ensuring that the food area of ​​the vacuum bag is evenly opened, forming a stable support space, and avoiding insufficient local support that could cause the vacuum bag to squeeze the food.

[0028] Then combine Figure 7As shown, each of the two heat-sealing strips 31 has an opening 311 on its opposite surface for the drive rod 41 to slide and limit. The core function of the opening 311 is to provide a limiting and guiding function for the axial extension and retraction of the drive rod 41. At the same time, the size of the opening 311 is precisely matched with the outer diameter of the drive rod 41, which can not only ensure the smooth sliding of the drive rod 41, but also ensure that the drive rod 41 fits tightly against the inner wall of the opening 311 when the heat-sealing strip 31 is closed, avoiding excessive gaps at the opening end of the vacuum bag at the opening 311, ensuring the sealing of the first heat seal, and reserving an unsealed area to provide a channel for subsequent air extraction.

[0029] Both sides of the outer wall of the drive rod 41 are slidably provided with support blocks 47. The front end of the support block 47 is tapered. The end of the connecting rod 42 near the drive rod 41 is provided with a slot corresponding to the support block 47. When the support block 47 is inserted into the slot, it can limit the rotation angle of the connecting rod 42 and limit the rotation range of the connecting rod 42, so as to ensure that the support rod 43 can remain parallel to the support plate of the shell 2 when it is unfolded.

[0030] The working principle of the external support of the support rod 43 is explained in detail below: In the initial state, the connecting rod 42 and the support rod 43 are located inside the heat-sealing strip 31 and are blocked by the heat-sealing strip 31, so they cannot be unfolded. At this time, the support block 47 continues to move forward, pushing the drive rod 41 to move forward synchronously. The drive rod 41 slides forward along the opening 311 of the heat-sealing strip 31 until the connecting rod 42 and the support rod 43 are fully extended out of the heat-sealing strip 31. At this time, the rear end of the drive rod 41 is stuck at the rear end of the opening 311 and is limited by the opening 311, so it cannot move forward. Meanwhile, the electric push rod 6 continues to push the support block 47 forward, so that the support block 47... The front end of the support block 47 extends into the slot at the rear end of the connecting rod 42, providing support and limiting the connecting rod 42. As the support block 47 continues to extend, it pushes the two connecting rods 42 to rotate relative to each other. Since the connecting rod 42 and the support rod 43 are connected by the ear plate and the connecting shaft, and there is a natural included angle at the connection, this included angle will drive the two support rods 43 to expand synchronously and parallelly when the two connecting rods 42 rotate relative to each other, until the support block 47 is fully inserted into the slot, and the rotation angle of the connecting rod 42 is limited. At this time, the two support rods 43 remain parallel to the support plate of the shell 2, completing the external support action of the support rods 43, accurately opening the food area of ​​the vacuum bag, and forming a stable support space.

[0031] Next according to Figure 6 and Figure 2As shown, the drive rod 41, connecting rod 42 and support rod 43 are provided with interconnected air passages 45. The air passages 45 are used to conduct air from the vacuum bag to the suction port 44, which works with the negative pressure machine 5 to perform air extraction. The rear end of the drive rod 41 is provided with a suction port 44 that communicates with the air passages 45. The suction port 44 is the connection interface between the air passages 45 and the negative pressure machine 5, and is used to extract air from the vacuum bag during the unfolding or closing of the support rod 43, ensuring that the air extraction process is continuous and smooth.

[0032] The housing 2 is equipped with a negative pressure machine 5. The suction end of the negative pressure machine 5 is connected to the suction port 44 through an air pipe. The negative pressure machine 5 is the power source for the suction operation.

[0033] refer to Figure 8 As shown, the principle of the first step of evacuation after the vacuum bag is inflated is explained in detail below: After the support rod 43 completes the external support action, opening up the food area of ​​the vacuum bag to form a support space, the vacuum bag containing food is first placed on the support plate of the shell 2, so that the food is located between the two support rods 43. At the same time, the opening end of the vacuum bag is wrapped around the two support components 4 and passes through the heat sealing strip 2 32, so that the opening end of the vacuum bag is located between the heat sealing strip 1 31. Then, the electric push rod 1 33 is controlled to extend and retract, driving the upper heat sealing strip 1 31 to move downward and close with the lower heat sealing strip 1 31, performing the first heat sealing on the opening end of the vacuum bag. Since the opening 311 on the heat sealing strip 1 31 accommodates the drive rod 41, therefore... After the first heat sealing, an unsealed area will remain at the opening 311. This unsealed area serves as an air extraction channel. At this time, the negative pressure machine 5 is turned on, generating negative pressure. The negative pressure is connected to the air extraction port 44 through the air pipe. The air passage 45, which is connected inside the drive rod 41, connecting rod 42, and support rod 43, is used to extract the air from the vacuum bag. Since the support rod 43 opens the vacuum bag in the food area, it forms a support space. The vacuum bag will not compress the food. Therefore, during the air extraction process, the air outside the food area in the vacuum bag is extracted first. The air in the food area is not extracted quickly due to the support of the support rod 43, and the vacuum bag will not compress the food due to the negative pressure, thus fundamentally eliminating the problem of food leakage.

[0034] Then refer to again Figure 6 A connecting frame 48 connects the multiple support blocks 47 into a whole, ensuring that all support blocks 47 can slide synchronously when the electric push rod 6 is driven. A connecting frame 46 connects the two drive rods 41 into a whole, ensuring that the two drive rods 41 can extend and retract synchronously. A through hole is provided inside the connecting frame 46, and the connecting frame 48 is located at the front end of the connecting frame 46.

[0035] An electric push rod 6 is installed inside the housing 2. The telescopic end of the electric push rod 6 passes through the through hole of the connecting frame 46 and is connected to the connecting frame 48, and is used to drive the support block 47 and the drive rod 41 to move sequentially.

[0036] After the first step of evacuation is completed, refer to Figure 9-11 As shown, after the first step of evacuation is completed, the air outside the food area inside the vacuum bag has been basically removed. At this time, the telescopic end of the electric push rod 26 retracts backward, driving the connecting frame 2 48 to move backward. The connecting frame 2 48 drives multiple support blocks 47 to slide backward along the outer wall of the drive rod 41. The support blocks 47 gradually exit from the slot at the rear end of the connecting rod 42, no longer providing support and limiting for the connecting rod 42. Since the connecting rod 42 and the support rod 43 are still in the extended state at this time and are subject to the slight wrapping force of the vacuum bag, the connecting rod 42 will not retract immediately, ensuring the continuity of the evacuation process. As the electric push rod 26 continues to retract, the connecting frame 2 48 moves backward and abuts... Pressed against the rear end of the connecting frame 46, the connecting frame 46 and the two drive rods 41 retract synchronously. The drive rods 41 slide backward along the opening 311 of the heat-sealing strip 31. When the connecting rod 42 moves to the front end of the heat-sealing strip 32, it is squeezed by the heat-sealing strip 32, and the two connecting rods 42 begin to rotate in opposite directions. Since the connecting rods 42 and the support rods 43 are connected by the ear plate and the connecting shaft, the reverse rotation of the connecting rods 42 will drive the two support rods 43 to move closer together and merge, gradually reducing the support space for the food area of ​​the vacuum bag, until the drive rods 41 retract completely and the support rods 43 merge completely, completing the retraction and merging action of the support rods 43.

[0037] After the strut 43 is assembled, its internal air passage 45 will form as follows: Figure 12 As shown, the air passages 45, which were originally dispersed in the support rod 43 and the connecting rod 42, will gradually converge as the support rod 43 is combined. The outlet of the air passage 45, namely the air extraction hole on the end face of the support rod 43, will gradually approach the food area. The air passage 45 can continuously be aligned with the food area to achieve precise air extraction from the food area, ensuring thorough air extraction, while avoiding blockage of the air passage 45 and ensuring smooth air extraction.

[0038] The following details the principle behind the simultaneous retraction and air extraction of strut 43. Figure 13As shown, during the retraction and merging of the support rod 43, the negative pressure machine 5 remains operational, continuously generating negative pressure. As the support rod 43 gradually reduces the support space for the food area of ​​the vacuum bag during the merging process, the air in the food area is gradually compressed. At the same time, the air passage 45 remains connected to the inside of the vacuum bag, and as the support rod 43 merges, the air extraction port of the air passage 45 gradually approaches the food area, enabling more precise extraction of air from the food area. At this time, the air pressure inside the vacuum bag is gradually decreasing, preventing the vacuum bag from squeezing the food due to a sudden drop in air pressure. The air in the food area is gradually extracted, and the food, supported by the support rod 43, is not directly squeezed, preventing juice leakage.

[0039] The following details the process of the front end of the strut 43 moving backward to the rear end of the heat-sealing strip 32, such as... Figure 14-15 As shown, when the front end of the support rod 43 moves backward to the rear end of the heat-sealing strip 2 32, the support rod 43 is completely merged, and the drive rod 41, connecting rod 42 and support rod 43 have all exited the range of action of the heat-sealing strip 2 32. At this time, the air in the vacuum bag has been completely removed, reaching the specified vacuum degree. After the control system detects that the support rod 43 has moved to the specified position, it controls the electric push rod 1 33 that drives the heat-sealing strip 2 32 to quickly extend and retract, driving the upper heat-sealing strip 2 32 to move downward and quickly close with the lower heat-sealing strip 2 32, performing a second heat seal on the opening end of the vacuum bag. The core function of the second heat seal is to completely seal the unsealed area left at the opening 311 of the heat-sealing strip 1 31 during the first heat seal, and at the same time, to reinforce and seal the entire opening end of the vacuum bag a second time, ensuring that the vacuum bag is completely sealed.

[0040] The final step is to seal the food in a vacuum bag, with the bag opening having a first seal from the first heat-sealing step and a second seal from the second heat-sealing step, as shown below. Figure 15 As shown, the double-sealing design provides double protection for the sealing effect, avoiding the problems of damage and air leakage that can occur with a single seal, further improving the sealing performance of the vacuum bag and extending the shelf life of food; at the same time, the first sealing part and the second sealing part correspond to the two stages of step-by-step air extraction, respectively.

[0041] Working Principle: Below is a brief overview of the working principle. Please write it concisely, but the initial state requires the support rod 43 to be positioned between the two heat-sealing strips 31. During use, the two heat-sealing strips 31 are opened vertically, leaving space for the drive rod 41, connecting rod 42, and support rod 43 to pass through. Then, the electric push rod 6 is activated, pushing the connecting frame 48 forward and the support block 47 forward. Because the support rod 43 and connecting rod 42 are located inside the heat-sealing strips 31, they cannot unfold. The drive rod 41 continues to move forward, pushing it forward until the connecting rod 42 and support rod 43 are fully extended, until the drive... The rear end of rod 41 is locked at the rear end of opening 311, preventing the drive rod 41 from moving. The drive rod 41 continues to move, causing its front end to extend into the slot at the rear end of connecting rod 42, allowing the two connecting rods 42 to unfold vertically. At this point, because there is an ear plate connecting the connecting rod 42 and the support rod 43 to the connecting shaft, and a natural angle exists at the connection point, this angle ensures that when the two connecting rods 42 are unfolded, both support rods 43 are parallel to the support plate of the housing 2. Then, food is placed in a vacuum bag, and the vacuum bag is placed on the support plate of the housing 2. The food needs to be placed between the two support rods 43, and the opening of the vacuum bag should be wrapped around both support rods. Component 4, then passes through heat-sealing strip 2 32, then moves the top heat-sealing strip 1 31 upwards, positioning the port between the two heat-sealing strips 1 31, then moves the top heat-sealing strip 1 31 downwards and performs heat sealing, then turns on the negative pressure machine 5, and extracts air from the vacuum bag through the air pipe and air extraction port 44 via the drive rod 41. At this time, the air in the area of ​​the vacuum bag away from the food is sucked away, but the food part is supported by the support rod 43, so the compressed vacuum bag will not crush the food. Then, the electric push rod 2 6 pulls the connecting frame 2 48 backwards, at this time the support block 47 moves sequentially and the connecting rod 42 is no longer supported, but it will not be the first Time rewinds, and then as the connecting frame 2 48 moves, it presses against the rear end of the connecting frame 1 46, thereby driving the drive rod 41 to move backward. When the connecting rod 42 is squeezed by the front end of the heat-sealing strip 2 32, the connecting rod 42 and the support rod 43 can be closed. The negative pressure in the drive rod 41 continues to draw air through the closed air passage 45, so that the connecting rod 42 and the support rod 43 move backward while drawing out the air in the food area, avoiding the vacuum bag from directly squeezing the food. Finally, when the front end of the support rod 43 moves backward to the rear end of the heat-sealing strip 2 32, the heat-sealing strip 2 32 moves downward quickly to heat-seal the gap left at the vacuum bag port.

[0042] Working principle: In the initial state, the support rod 43 is located between the two heat-sealing strips 31. When in use, the electric push rod 33 is controlled to drive the heat-sealing strips 31 to open up and down, leaving space for the drive rod 41, connecting rod 42 and support rod 43 to move. The electric push rod 6 is turned on, pushing the connecting frame 48 and the support block 47 to move forward. Because the connecting rod 42 and support rod 43 are blocked by the heat-sealing strips 31, they cannot unfold. This pushes the drive rod 41 to move forward until the connecting rod 42 and support rod 43 are fully extended. The rear end of the drive rod 41 is stuck at the rear end of the opening 311. The support block 47 extends into the slot of the connecting rod 42, driving the two connecting rods 42 to rotate relative to each other, and causing the two support rods 43 to unfold in parallel. Food is placed in a vacuum bag and placed on the support plate of the shell 2, with the food positioned between the two support rods 43. The opening of the vacuum bag wraps around the support assembly 4 and passes through the heat-sealing strip 32. The electric push rod 33 is controlled to drive the heat-sealing strip 31 to close, performing the first heat seal on the opening of the vacuum bag. An unsealed area is left at the opening 311. The negative pressure machine 5 is turned on, and air is extracted from the food area inside the vacuum bag through the air pipe, the air extraction port 44, and the air passage 45. Then, the electric push rod 6 retracts, driving the support block 47 out of the slot, and then driving the drive rod 41 to retract. The connecting rod 42 is squeezed by the heat-sealing strip 32 and rotates in the opposite direction, causing the support rods 43 to merge. During the merging process, air continues to be extracted, gradually removing air from the food area. When the front end of the support rod 43 moves to the rear end of the heat-sealing strip 32, the electric push rod 33 drives the heat-sealing strip 32 to close, performing the second heat seal to seal the unsealed area, completing the vacuum sealing of the food.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A food vacuum sealing and preservation device, comprising a support frame (1), wherein a housing (2) is mounted on the top of the support frame (1), characterized in that: The housing (2) is equipped with a sealing assembly (3) and a support assembly (4), the support assembly (4) penetrates the sealing assembly (3), and a vacuum bag is placed on the top of the support plate of the housing (2); The support assembly (4) includes two drive rods (41), the ends of which are rotatably connected to two connecting rods (42), and the ends of the connecting rods (42) are rotatably connected to a support rod (43). When the drive rod (41) extends axially, the two connecting rods (42) rotate relative to each other and drive the two support rods (43) to unfold in parallel to open the vacuum bag. When the drive rod (41) retracts, the two connecting rods (42) rotate in opposite directions and drive the two support rods (43) to move closer to each other and merge. The drive rod (41), connecting rod (42) and support rod (43) are provided with interconnected air passages (45). The rear end of the drive rod (41) is provided with an air extraction port (44) that communicates with the air passages (45) for drawing air from the vacuum bag during the unfolding or closing of the support rod (43).

2. The food vacuum sealing and preservation equipment according to claim 1, characterized in that: The sealing assembly (3) includes two vertically distributed heat sealing strips (31) installed at the port of the housing (2). Two vertically distributed heat sealing strips (32) are installed on the front side of the heat sealing strips (31). Openings (311) for limiting the sliding of the drive rod (41) are provided on the opposite surfaces of the two heat sealing strips (31).

3. The food vacuum sealing and preservation equipment according to claim 2, characterized in that: The housing (2) is equipped with multiple electric push rods (33). The lower heat sealing strip (31) is fixed inside the housing (2). The upper heat sealing strip (31) is connected to the telescopic end of the corresponding electric push rod (33). The lower heat sealing strip (32) and the upper heat sealing strip (32) are respectively connected to the telescopic end of the corresponding electric push rod (33) to drive the heat sealing strip (31) and the heat sealing strip (32) to open and close.

4. The food vacuum sealing and preservation equipment according to claim 1, characterized in that: The drive rod (41) and the connecting rod (42), as well as the connecting rod (42) and the support rod (43), are rotatably connected by ear plates and connecting shafts.

5. The food vacuum sealing and preservation equipment according to claim 1, characterized in that: Both sides of the outer wall of the drive rod (41) are slidably supported by support blocks (47). The front end of the support block (47) is tapered. The end of the connecting rod (42) near the drive rod (41) is provided with a slot corresponding to the support block (47). When the support block (47) is inserted into the slot, it can limit the rotation angle of the connecting rod (42).

6. The food vacuum sealing and preservation equipment according to claim 5, characterized in that: A second connecting frame (48) is connected between multiple support blocks (47), and a first connecting frame (46) is connected between two drive rods (41). The first connecting frame (46) has a through hole inside, and the second connecting frame (48) is located at the front end of the first connecting frame (46).

7. The food vacuum sealing and preservation equipment according to claim 6, characterized in that: The housing (2) is equipped with an electric push rod (6). The telescopic end of the electric push rod (6) passes through the through hole of the connecting frame (46) and is connected to the connecting frame (48) to drive the support block (47) and the drive rod (41) to move sequentially.

8. The food vacuum sealing and preservation equipment according to claim 1, characterized in that: The air extraction port (44) is located at the rear end of the drive rod (41), and the air passage (45) passes through the interior of the drive rod (41), the connecting rod (42) and the support rod (43) in sequence, and forms an air extraction hole on the end face of the support rod (43).

9. A food vacuum sealing and preservation device according to claim 1, characterized in that: The housing (2) is equipped with a negative pressure machine (5), and the suction end of the negative pressure machine (5) is connected to the suction port (44) through an air pipe.

10. A method of using a food vacuum sealing and preservation device, comprising using the food vacuum sealing and preservation device according to claim 2, characterized in that, Includes the following steps: S1. Place the vacuum bag on the support plate of the shell (2) and make the area where the food to be packaged is located inside the vacuum bag between the two support rods (43). The open end of the vacuum bag passes through the heat sealing strip one (31) and the heat sealing strip two (32) in sequence. S2. Drive the two drive rods (41) to extend axially, so that the two connecting rods (42) at the end of each drive rod (41) rotate relative to each other, thereby driving the two support rods (43) to unfold in parallel and open the bag body corresponding to the food area inside the vacuum bag. S3. Control the heat sealing strip (31) to close and perform the first heat sealing on the opening end of the vacuum bag. The opening (311) on the heat sealing strip (31) has an unsealed area because it accommodates the drive rod (41). S4. The vacuum bag is evacuated through the air extraction port (44) and the connected air passage (45) to remove the air outside the food area inside the vacuum bag. S5. Drive the two drive rods (41) to retract, so that the two connecting rods (42) rotate in opposite directions and drive the two support rods (43) to come closer together and merge. During the merging process, continue to draw air through the air passage (45) to gradually remove the air from the food area. S6. After the drive rod (41) has completely exited the heat sealing strip one (31) and the heat sealing strip two (32), control the heat sealing strip two (32) to close, and perform a second heat seal on the opening end of the vacuum bag, completely sealing the entire opening end, including the previously unsealed area.

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