Packaging bag sealing device and fruit and vegetable sealing packaging equipment

Abstract

The invention discloses a packaging bag sealing device and fruit and vegetable sealing packaging equipment, and belongs to the technical field of fruit and vegetable packaging, the packaging bag sealing device comprises a sealing base and a sealing mechanism, a flexible pressing strip can be separated from and combined with a pressing sealing working area of the sealing base, and a heating pressing plate can be separated from and combined with a hot melting working area of the sealing base; a first channel is arranged on the clutch path between the flexible pressing strip and the pressing and sealing working area, a second channel is arranged on the clutch path between the heating pressing plate and the hot melting working area, and bag openings of packaging bags sequentially penetrate through the first channel and the second channel. A preset distance corresponding to a pipe opening of an air path pipe head is formed between the first channel and the second channel. The fruit and vegetable sealing packaging equipment comprises a packaging machine and the packaging bag sealing device. The flexible pressing strip and the pressing sealing working area are closed, so that the air path pipe head and the packaging bag are in a sealed state, on one hand, the air exhaust and inflation effects are guaranteed, and on the other hand, it is guaranteed that materials in the packaging bag are prevented from being polluted by external harmful factors during hot melting sealing.

Description

Technical Field

[0001] This invention relates to the field of fruit and vegetable packaging technology, and in particular to a packaging bag sealing device and fruit and vegetable sealing packaging equipment. Background Technology

[0002] In modern life, fresh produce, especially fruits and vegetables, often requires long-distance transportation and extended storage. To prevent spoilage and decay, reliable packaging is essential. Currently, vacuum packaging and gas-filled packaging are commonly used to seal fresh produce. Vacuum packaging works by placing fruits and vegetables into specific packaging bags and then removing air (especially oxygen) from the bags through a vacuum process. This preserves freshness and extends shelf life. A vacuum pump is used to create a vacuum environment, reducing the respiration of the produce and slowing down spoilage. Gas-filled packaging, on the other hand, involves filling the packaging bags with gases such as nitrogen, carbon dioxide, or inert gases that inhibit respiration, further reducing the oxygen content and preventing spoilage while maintaining the food's color, aroma, and flavor. Vacuum packaging and the use of inert gas can effectively isolate fruits and vegetables from air, slow down the oxidation reaction and microbial growth of fruits and vegetables, thereby extending their shelf life. Under proper storage conditions, vacuum-packed and gas-filled fruits and vegetables can maintain their freshness and taste for a longer period of time.

[0003] Vacuum packaging and gas-filled packaging are completed by fruit and vegetable sealing packaging equipment. In existing fruit and vegetable equipment, the processes of vacuuming, gas filling, and sealing the packaging bags involve removing the vacuum head of the vacuum tube and the gas filling head of the gas filling tube after the vacuuming and inert gas filling operations are completed. This process causes a brief connection between the internal space of the packaging bag and the outside environment, allowing outside air to enter and disrupting the established vacuum or gas-filled environment. This increases the oxygen content inside the packaging bag, accelerating the oxidation and spoilage process of the fruits and vegetables. External air, microorganisms, and pollutants also enter the packaging bag during this time. These microorganisms and pollutants come into contact with the fruits and vegetables, causing them to spoil, mold, or develop unpleasant odors. This not only affects the quality and taste of the fruits and vegetables but also poses a threat to consumer health. Summary of the Invention

[0004] The purpose of this invention is to provide a packaging bag sealing device and fruit and vegetable sealing packaging equipment to solve the problems existing in the prior art. The flexible pressure strip and the sealing working area are closed, which can tightly wrap the bag opening of the packaging bag with the air passage pipe head, so that the air passage pipe head and the packaging bag can be in a sealed state. On the one hand, it can ensure the effect of air extraction and / or air filling at the air passage pipe head. On the other hand, it can ensure that the inside of the bag is always in a sealed environment during heat fusion sealing, effectively preventing harmful factors such as external air, moisture, and microorganisms from contaminating the materials (such as vegetables, fruits or other foods) inside the packaging bag, thereby ensuring the freshness and quality of the materials.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention discloses a packaging bag sealing device, including a sealing base and a sealing mechanism. The sealing base has a sealing working surface, and the sealing working surface is provided with a pressure sealing working area and a heat melting working area. The sealing mechanism includes a flexible pressure strip and a heating pressure plate. The flexible pressure strip can separate from the pressure sealing working area. A first channel is provided between the flexible pressure strip and the pressure sealing working area on the separation path. The heating pressure plate can separate from the heat melting working area. A second channel is provided between the heating pressure plate and the heat melting working area on the separation path. The second channel and the first channel are used for the bag opening of the packaging bag to pass through sequentially. A preset distance is provided between the first channel and the second channel. The preset distance is used for the corresponding opening of the air passage head extending into the bag opening.

[0006] Preferably, the system further includes a first pressure plate and a second pressure plate. The first pressure plate has a first sliding groove on its end face facing the sealing working surface. A first sliding base and a first compression spring are disposed in the first sliding groove. One end of the first compression spring is fixedly connected to the first sliding groove, and the other end of the first compression spring is fixedly connected to one end of the first sliding base. The flexible pressure strip is installed at the other end of the first sliding base. A first protrusion is disposed in the groove opening of the first sliding groove. There is a first movable distance between the first protrusion and the bottom of the first sliding groove for the first compression spring to extend. A second protrusion is disposed on the first sliding base and located in the first sliding groove. The first protrusion is located on the moving path of the second protrusion. The heating pressure plate is installed on the end of the second pressure plate facing the sealing working surface.

[0007] Preferably, the second pressure plate has a second sliding groove on its end face facing the sealing working surface. A second sliding base and a second compression spring are disposed in the second sliding groove. One end of the second compression spring is fixed to the bottom of the second sliding groove, and the other end of the second compression spring is fixedly connected to one end of the second sliding base. An elastic pressure strip is installed on the other end of the second sliding base. The elastic pressure strip and the heating pressure plate both correspond to the hot melt working area. A third protrusion is disposed in the groove opening of the second sliding groove. There is a second moving distance between the third protrusion and the bottom of the second sliding groove for the second compression spring to extend. A fourth protrusion is disposed on the second sliding base located in the second sliding groove. The third protrusion is located on the moving path of the fourth protrusion. The heating pressure plate is mounted on one end of the second pressure plate facing the sealing working surface via a connecting column.

[0008] Preferably, both the flexible pressure strip and the elastic pressure strip are elastic rubber blocks.

[0009] Preferably, the device further includes a mounting bracket, wherein one end of the mounting bracket facing the sealing working surface is provided with a first limiting groove and a second limiting groove, the first pressure plate is slidably connected to the first limiting groove, and the second pressure plate is slidably connected to the second limiting groove.

[0010] Preferably, the system further includes a power mechanism, which comprises a power motor, a power gear, a first rack, and a second rack. The power motor is mounted on the mounting bracket, and the power gear is coaxially fixedly connected to the motor shaft of the power motor. Both the first rack and the second rack mesh with the power gear, and the power gear is located between the first rack and the second rack. The extension direction of the first rack is parallel to the groove depth direction of the first limiting groove, and the extension direction of the second rack is parallel to the groove depth direction of the second limiting groove. The first pressure plate is mounted on the first rack, and the second pressure plate is mounted on the second rack.

[0011] A fruit and vegetable sealing packaging device is also disclosed, including a packaging machine and the aforementioned packaging bag sealing device. The packaging machine includes an air pipe head, a working platform for placing the packaging bag, and a lifting mechanism for controlling the up and down movement of the air pipe head. The sealing working surface in the packaging bag sealing device is vertically arranged, and the heat-melting working area on the sealing working surface is located below the pressure sealing working area. The preset spacing in the packaging bag sealing device is located on the lifting path of the air pipe head. The working platform is located below the second channel in the packaging bag sealing device. There is a first height difference between the working platform and the first channel in the packaging bag sealing device. There is a second height difference between the bag opening of the packaging bag placed on the working platform and the working platform. The first height difference is smaller than the second height difference.

[0012] Preferably, the lifting mechanism includes a telescopic cylinder, a lifting slide rail, and a lifting block. The cylinder body of the telescopic cylinder is mounted on the packaging machine, the piston rod of the telescopic cylinder is fixedly connected to the lifting block, the air pipe head is mounted on the lifting block, the lifting block is slidably connected to the lifting slide rail, and the lifting slide rail is vertically arranged.

[0013] Preferably, the gas pipe head includes a vacuum head and an inflation head arranged side by side, with the vacuuming end of the vacuum head and the inflation end of the inflation head being flush.

[0014] Preferably, the packaging machine further includes an inclined platform, which is located at one end of the working platform near the sealing working surface and is located below the second channel.

[0015] The present invention achieves the following technical effects compared to the prior art: This invention uses a flexible pressure strip and a closed sealing working area to press the bag opening tightly against the air passage pipe head, ensuring that the inside of the bag remains sealed during the heat-sealing process. This guarantees that the bag opening is tightly sealed before, during, and for a short period after heat sealing, effectively preventing harmful factors such as external air, moisture, and microorganisms from contaminating the materials inside the bag (such as vegetables, fruits, or other foods), thus ensuring the freshness and quality of the materials. Furthermore, the sealed environment inside the bag during the sealing process effectively prevents the intrusion of external contaminants. Simultaneously, the heat generated by the heating plate rapidly raises the sealing material to its melting point and bonds it together, forming a strong seal. This not only ensures food safety and hygiene but also improves the integrity and aesthetics of the packaging. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the fruit and vegetable sealing packaging equipment in an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of the fruit and vegetable sealing packaging equipment in an embodiment of the present invention; Figure 3 This is a partial three-dimensional structural diagram of the fruit and vegetable sealing packaging equipment in an embodiment of the present invention; Figure 4This is a three-dimensional structural diagram of the packaging bag sealing device in an embodiment of the present invention; Figure 5 This is a rear view schematic diagram of the packaging bag sealing device in an embodiment of the present invention; Figure 6 This is a front view structural diagram of the packaging bag sealing device in an embodiment of the present invention; Figure 7 This is a three-dimensional structural diagram of the power mechanism in an embodiment of the present invention; Figure 8 This is a diagram showing the positional relationship between the first pressure plate and the second pressure plate in an embodiment of the present invention. Figure 9 This is a schematic diagram of the cross-sectional structure of the first pressure plate in an embodiment of the present invention; Figure 10 for Figure 9 Enlarged cross-sectional view of the first pressure plate in the middle; Figure 11 This is a schematic diagram of the cross-sectional structure of the second pressure plate in an embodiment of the present invention; Figure 12 for Figure 11 Enlarged cross-sectional view of the second pressure plate.

[0018] Explanation of reference numerals in the attached drawings: 1. Packaging machine; 2. Working platform; 3. Inclined platform; 4. Vacuum head; 5. Inflating head; 6. Telescopic cylinder; 7. Lifting slide rail; 8. Lifting block; 9. Sealing base; 10. Flexible pressure strip; 11. Heating pressure plate; 12. Elastic pressure strip; 13. First pressure plate; 14. First sliding groove; 15. First sliding base; 16. First compression spring; 17. First protrusion; 18. Second protrusion; 19. Second pressure plate; 20. Second sliding groove; 21. Second sliding base; 22. Second compression spring; 23. Third protrusion; 24. Fourth protrusion; 25. Connecting column; 26. Mounting bracket; 27. First limiting groove; 28. Second limiting groove; 29. ​​Power motor; 30. Power gear; 31. First rack; 32. Second rack. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a packaging bag sealing device and fruit and vegetable sealing packaging equipment to solve the problems existing in the prior art. The flexible pressure strip and the sealing working area can tightly wrap the bag opening of the packaging bag with the air passage pipe head, so that the air passage pipe head and the packaging bag can always be in a sealed state. On the one hand, it can ensure the effect of air extraction and / or air filling at the air passage pipe head. On the other hand, it can ensure that the bag is always in a sealed environment during heat fusion sealing, effectively preventing harmful factors such as external air, moisture, and microorganisms from contaminating the materials (such as vegetables, fruits or other foods) inside the packaging bag, thereby ensuring the freshness and quality of the materials.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 like Figures 1 to 12 As shown, this embodiment provides a packaging bag sealing device, including a sealing base 9 and a sealing mechanism. The sealing base 9 has a sealing working surface, and the sealing working surface is provided with a pressure sealing working area and a heat-melting working area. The sealing mechanism includes a flexible pressure strip 10 and a heating pressure plate 11. The flexible pressure strip 10 can separate from the pressure sealing working area, and there is a first channel between the flexible pressure strip 10 and the pressure sealing working area on the separation path. The heating pressure plate 11 can separate from the heat-melting working area, and there is a second channel between the heating pressure plate 11 and the heat-melting working area on the separation path. The first channel and the second channel are used for the bag opening of the packaging bag to pass through sequentially. There is a preset distance between the first channel and the second channel, which is used to correspond to the opening of the air passage head (refer to the vacuum head 4 and / or the inflation head 5) extending into the bag opening. The number of flexible pressure strips 10 and heating pressure plates 11 is not limited and can be freely set as needed. This packaging bag sealing device can be used alone or in conjunction with vacuum fruit and vegetable sealing packaging equipment, gas-filled fruit and vegetable sealing packaging equipment, or vacuum / gas-filled fruit and vegetable sealing packaging equipment.

[0023] Working principle: First, the flexible pressure strip 10 leaves the sealing working area to form a first channel, and the heating pressure plate 11 leaves the heat-melting working area to form a second channel. Then, the opening of the packaging bag filled with material is passed through the second channel and the first channel in sequence. Next, the gas pipe head is inserted into the opening of the packaging bag, and the opening of the gas pipe head extends into the preset distance between the first channel and the second channel. Subsequently, the flexible pressure strip 10 and the sealing working area are closed, and the flexible pressure strip 10 presses the packaging bag and the gas pipe head tightly onto the sealing working area. Utilizing its flexible deformation characteristics, the packaging bag can wrap around the outside of the gas pipe head and fit tightly with the gas pipe head, ensuring that there are no gaps between the bag opening and the gas pipe head, and preventing communication with the outside during the air extraction or inflation process. After the air extraction or inflation is completed, the heating pressure plate 11 and the heat-melting working area are closed, and the heating pressure plate 11 melts and seals the packaging bag. Because the opening of the gas pipe head is located between the bag opening and the melt-sealing position, after the melt-sealing is completed, the gas pipe head is removed, and the packaging bag will not exchange gases with the outside.

[0024] In one embodiment, the system further includes a first pressure plate 13 and a second pressure plate 19. The first pressure plate 13 has a first sliding groove 14 on its end face facing the sealing working surface. A first sliding base 15 and a first compression spring 16 are disposed within the first sliding groove 14. One end of the first compression spring 16 is fixedly connected to the first sliding groove 14, preferably directly fixedly connected to the bottom of the first sliding groove 14. The other end of the first compression spring 16 is fixedly connected to one end of the first sliding base 15, and a flexible pressure strip 10 is installed at the other end of the first sliding base 15.

[0025] A first protrusion 17 is provided in the groove of the first sliding groove 14, and there is a first movable gap between the first protrusion 17 and the bottom of the first sliding groove 14 for the first compression spring 16 to extend. A second protrusion 18 is provided on the first sliding base 15, located in the first sliding groove 14. The first protrusion 17 is located on the moving path of the second protrusion 18 to limit the second protrusion 18 and prevent the first sliding base 15 from disengaging from the first sliding groove 14. During movement, the flexible pressure strip 10 can be moved by the first pressure plate 13. After the flexible pressure strip 10 is pressed onto the packaging bag, the first pressure plate 13 is moved further, and the first compression spring 16 will be compressed and contracted to improve the pressing effect of the flexible pressure strip 10, which can further ensure the sealing effect. When the first pressure plate 13 is moved, the first compression spring 16 will first return to its original position until the first protrusion 17 and the second protrusion 18 come into contact, and then the flexible pressure strip 10 will be moved away from the packaging bag. This setting can ensure that the flexible pressure strip 10 will not detach from the bag opening instantly, resulting in poor sealing. The heating pressure plate 11 is installed on one end of the second pressure plate 19 facing the sealing working surface.

[0026] In one embodiment, the number of first sliding grooves 14 can be set according to needs, such as setting two first sliding grooves 14. Correspondingly, each first sliding groove 14 is provided with a first sliding base 15 and a first compression spring 16, and each first sliding base 15 is equipped with a flexible pressure strip 10. The number of first compression springs 16 is set as needed. The first compression springs 16 are evenly distributed in the first sliding grooves 14, which can make the bag opening of the packaging bag evenly stressed during the sealing process, avoiding problems such as poor sealing or damage to vegetable packaging bags caused by uneven stress.

[0027] In one embodiment, a second sliding groove 20 is provided on the end face of the second pressure plate 19 facing the sealing working surface. A second sliding base 21 and a second compression spring 22 are disposed in the second sliding groove 20. One end of the second compression spring 22 is fixed to the bottom of the groove of the second sliding groove 20, and the other end of the second compression spring 22 is fixedly connected to one end of the second sliding base 21. An elastic pressure strip 12 is installed on the other end of the second sliding base 21. The elastic pressure strip 12 and the heating pressure plate 11 both correspond to the hot melt working area. A third protrusion 23 is provided in the groove opening of the second sliding groove 20. There is a second moving distance between the third protrusion 23 and the bottom of the groove of the second sliding groove 20 for the second compression spring 22 to extend. A fourth protrusion 24 is provided on the second sliding base 21 located in the second sliding groove 20. The third protrusion 23 is located on the moving path of the fourth protrusion 24 to limit the fourth protrusion 24 and prevent the second sliding base 21 from disengaging from the second sliding groove 20. Before the heating plate 11 contacts the packaging bag, the elastic pressure strip 12 on the second sliding base 21 first contacts the packaging bag. As the second compression spring 22 compresses, the heating plate 11 finally contacts the packaging bag. Because the elastic pressure strip 12 on the second sliding base 21 contacts the packaging bag, the two side walls of the packaging bag at the area to be sealed by the heating plate 11 can fit tightly together, ensuring a good sealing effect and avoiding the risk of gaps in the sealing due to loose side walls. Moreover, due to the compression of the elastic pressure strip 12 on the second sliding base 21, the flexible pressure strip 10 on the first pressure plate 13 can detach from the packaging bag, allowing the air pipe head to be pulled out. Alternatively, it can be left in the packaging bag until the sealing is complete, at which point the flexible pressure strip 10 on the first pressure plate 13 can be detached, and the air pipe head can be pulled out. The heating plate 11 is mounted on the end of the second pressure plate 19 facing the sealing working surface via a connecting post 25. The number of connecting posts 25 is set as needed, with at least two connecting posts 25. The two connecting posts 25 are fixedly connected to both ends of the length of the heating pressure plate 11, and the length direction of the heating pressure plate 11 is parallel to the length direction of the second pressure plate 19. The heating pressure plate 11 generates heat, which raises the temperature of the sealing material of the packaging bag to its melting point, thereby sealing the opening of the vegetable packaging bag.

[0028] In one embodiment, both the flexible pressure strip 10 and the elastic pressure strip 12 are elastic rubber blocks.

[0029] In one embodiment, the heating pressure plate 11 is located between the flexible pressure strip 10 on the first pressure plate 13 and the elastic pressure strip 12 on the second pressure plate 19. Of course, the elastic pressure strip 12 of the second pressure plate 19 may also be located between the heating pressure plate 11 and the flexible pressure strip 10 on the first pressure plate 13.

[0030] In one embodiment, the number of second sliding grooves 20 can be set according to needs, such as setting two second sliding grooves 20. Correspondingly, each second sliding groove 20 is provided with a second sliding base 21 and a second compression spring 22, and each second sliding base 21 is equipped with an elastic pressure strip 12. The number of second compression springs 22 is set as needed. The second compression springs 22 are evenly distributed in the second sliding grooves 20, which can make the bag opening of the packaging bag evenly stressed during the sealing process, avoiding problems such as poor sealing or damage to the vegetable packaging bag caused by uneven stress.

[0031] In one embodiment, the device further includes a mounting bracket 26. The end of the mounting bracket 26 facing the sealing working surface is provided with a first limiting groove 27 and a second limiting groove 28. A first pressure plate 13 is slidably connected to the first limiting groove 27, and a second pressure plate 19 is slidably connected to the second limiting groove 28. The mounting bracket 26 facilitates the installation of this packaging bag sealing device on vacuum fruit and vegetable sealing packaging equipment or vacuum-filled fruit and vegetable sealing packaging equipment. It also guides and limits the sliding direction of the first pressure plate 13 and the second pressure plate 19. The number of the first limiting groove 27 and the second limiting groove 28 is determined according to the number of the first pressure plate 13 and the second pressure plate 19.

[0032] In one embodiment, a power mechanism is also included, comprising a power motor 29, a power gear 30, a first rack 31, and a second rack 32. The power motor 29 is mounted on a mounting bracket 26, and the power gear 30 is coaxially fixedly connected to the motor shaft of the power motor 29. Both the first rack 31 and the second rack 32 mesh with the power gear 30. The power gear 30 is located between the first rack 31 and the second rack 32. The first rack 31 is slidably connected to a first limiting groove 27, and the extension direction of the first rack 31 is parallel to the groove depth direction of the first limiting groove 27. The second rack 32 is slidably connected to a second limiting groove 28, and the extension direction of the second rack 32 is parallel to the groove depth direction of the second limiting groove 28. A first pressure plate 13 is mounted on the first rack 31, and a second pressure plate 19 is mounted on the second rack 32. The motor shaft of the power motor 29 drives the power gear 30 to rotate, which in turn drives the first rack 31 and the second rack 32 to move simultaneously in two opposite directions, thereby causing the first pressure plate 13 and the second pressure plate 19 to move in two opposite directions. A single power motor 29 can achieve the sealing of the flexible pressure strip 10, the melting and sealing of the heated pressure plate 11, and the sealing of the elastic pressure strip 12. This eliminates the need for multiple power motors 29 to drive the flexible pressure strip 10, the heated pressure plate 11, and the elastic pressure strip 12 separately, reducing equipment costs.

[0033] When sealing the packaging bag, the power motor 29 drives the power gear 30 to rotate. As the power gear 30 rotates, it first moves the first pressure plate 13 toward the sealing base 9. At this time, the second pressure plate 19 moves away from the heat-melting working area until the flexible pressure strip 10 of the first pressure plate 13 squeezes the packaging bag. As the power gear 30 rotates, the first compression spring 16 begins to compress, ensuring that the flexible pressure strip 10 of the first pressure plate 13 presses the packaging bag tightly against the air pipe head. After the gas pipe head completes the vacuuming and / or inflation, the power motor 29 drives the power gear 30 to rotate in the opposite direction. The first pressure plate 13 moves away from the sealing working area, and the second pressure plate 19 moves towards the hot melt working area. At this time, the first compression spring 16 begins to extend, but the flexible pressure strip 10 of the first pressure plate 13 does not detach from the packaging bag until the elastic pressure strip 12 of the second pressure plate 19 presses on the packaging bag and the second compression spring 22 is compressed. Then, the flexible pressure strip 10 of the first pressure plate 13 just detaches from the opening of the packaging bag. Then the gas pipe head can be pulled out, and the heated pressure plate 11 generates heat to seal the bag.

[0034] The first compression spring 16, the second compression spring 22, the flexible pressure strip 10 of the first pressure plate 13, and the elastic pressure strip 12 of the second pressure plate 19 work together to ensure that the inside of the packaging bag is always in a sealed environment when it is sealed. This ensures that the opening of the packaging bag is in a tight sealed state before, during, and for a short period after heat sealing, effectively preventing harmful factors such as external air, moisture, and microorganisms from contaminating the material inside the packaging bag, thus ensuring the freshness and quality of the material. Furthermore, the inside of the packaging bag remains in a sealed environment throughout the sealing process, effectively preventing the intrusion of external contaminants.

[0035] In one embodiment, there is a first gap between the end face of the heating plate 11 facing the hot-melt working area and the opening of the second sliding groove 20, and a second gap between the end face of the elastic strip 12 facing the hot-melt working area and the opening of the second sliding groove 20 when the third protrusion 23 and the fourth protrusion 24 are in contact. The first gap is smaller than the second gap to ensure that the elastic strip 12 contacts the hot-melt working area before the heating plate 11.

[0036] In one embodiment, the first pressure plate 13 and the second pressure plate 19 are the same size, the first sliding groove 14 and the second sliding groove 20 are the same size and number, the first compression spring 16 and the second compression spring 22 are the same size, the first sliding base 15 and the second sliding base 21 are the same size, the first rack 31 and the second rack 32 are the same size and number, and the flexible pressure strip 10 and the elastic pressure strip 12 are the same size and number.

[0037] In one embodiment, the mounting bracket 26 is a U-shaped bracket, and both side walls of the mounting bracket 26 are provided with a first limiting groove 27 and a second limiting groove 28, both of which are T-shaped grooves. One side of the first rack 31 and one side of the second rack 32 are provided with T-shaped blocks that cooperate with the T-shaped grooves.

[0038] Example 2 like Figures 1 to 12As shown, this embodiment provides a fruit and vegetable sealing packaging device, including a packaging machine 1 and a packaging bag sealing device as described in Embodiment 1. The packaging machine 1 includes an air inlet (refer to vacuum head 4 and / or inflation head 5), a working platform 2, and a lifting mechanism. The working platform 2 is used to place the packaging bag. The lifting mechanism is used to control the up and down movement of the air inlet so that it can extend into the packaging bag on the working platform 2. The sealing base 9 in the packaging bag sealing device is located above the working platform 2, and the sealing working surface of the sealing base 9 is vertically arranged. The heat-sealing working area is located below the pressure sealing working area, so that the formed second channel is located below the first channel. The preset distance between the first channel and the second channel is located on the lifting path of the air inlet. The working platform 2 is located below the second channel of the sealing base 9. There is a first height difference between the working platform 2 and the first channel. There is a second height difference between the opening of the packaging bag placed on the working platform 2 and the working platform 2. The first height difference is smaller than the second height difference to ensure that the opening of the packaging bag placed on the working platform 2 can pass through the second channel and the first channel in sequence after standing upright, so as to be pressed by the flexible pressure strip 10 and the heating pressure plate 11. One or more air passage heads can be set. When there is only one air passage head, only vacuuming can be performed, or both vacuuming and inflation can be performed. When there are multiple air passage heads, at least one is used for vacuuming and one is used for inflation. Vacuuming can effectively remove air from the packaging bag and extend the shelf life of the material. Inert gas inflation is mainly used to maintain stable air pressure inside the packaging bag and further extend the storage time of the material.

[0039] Working principle: First, place the bottom of the packaging bag containing the material on the working platform 2, then make the bag opening stand upright and pass through the second and first channels in sequence. Next, the lifting mechanism lowers the air pipe head, inserting it into the bag opening. The pressure sealing working area of ​​the flexible pressure strip 10 and the sealing base 9 closes, sealing the air pipe head and the packaging bag. Then, after the air pipe head is evacuated or evacuated and filled with inert gas, the heat-sealing working area of ​​the heating plate 11 and the sealing base 9 closes to perform a melt seal. After the melt seal is completed, the air pipe head can rise and detach from the packaging bag under the upgrading component. If there is an elastic pressure strip 12, the air pipe head can rise and detach from the packaging bag under the upgrading component after the elastic pressure strip 12 closes with the melt seal working area. Alternatively, the air pipe head can be detached after the melt seal is completed. The setting can be adjusted according to actual needs.

[0040] In one embodiment, the lifting mechanism includes a telescopic cylinder 6, a lifting slide rail 7, and a lifting block 8. The cylinder body of the telescopic cylinder 6 is mounted on the packaging machine 1, and the piston rod of the telescopic cylinder 6 is fixedly connected to the lifting block 8. The air passage head is mounted on the lifting block 8, and the lifting block 8 is slidably connected to the lifting slide rail 7, which is vertically arranged. By extending or retracting the piston rod of the telescopic cylinder 6, the lifting block 8 can be driven to move up and down along the lifting slide rail 7, thereby causing the air passage head to move up and down. The piston rod of the telescopic cylinder 6 can be arranged downwards or upwards, depending on whether the telescopic cylinder 6 is located above or below the packaging bag sealing device. The telescopic cylinder 6 can be a hydraulic cylinder, an electric cylinder, or a pneumatic cylinder. Preferably, there are two lifting slide rails 7, which are respectively arranged on both sides of the air passage head.

[0041] In one embodiment, the gas supply head includes a vacuum head 4 and an inflation head 5 arranged side by side. The suction end of the vacuum head 4 and the exhaust end of the inflation head 5 are flush, so that they can be simultaneously inserted into the packaging bag under the action of the lifting block 8. The separate arrangement of the vacuum head 4 and the inflation head 5 ensures that the suction and inflation processes are carried out independently, which is more reliable than using a single gas supply head for both inflation and deflation. Vacuuming effectively removes air from the vegetable packaging bag, extending the shelf life of the vegetables. It also facilitates the inflation operation of the inflation head 5, which maintains stable air pressure inside the vegetable packaging bag, further extending the storage time of the vegetables. The vacuum head 4 is connected to a vacuum pipeline, and the inflation head 5 is connected to an inert gas supply pipeline.

[0042] In one embodiment, both the vacuum head 4 and the air filling head 5 are connected to the flow meter via pipelines.

[0043] In one embodiment, the packaging machine 1 further includes an inclined platform 3, which is located at one end of the working platform 2 near the sealing working surface and below the second channel. The inclined platform 3 provides oblique support for the packaging bag placed on the packaging machine 1, and works with the working platform 2 to restrict the movement of the packaging bag, preventing it from moving during the sealing and heat sealing process, and ensuring the reliability of the sealing and heat sealing.

[0044] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0045] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A packaging bag sealing device, characterized in that: The device includes a sealing base and a sealing mechanism. The sealing base has a sealing working surface, and the sealing working surface is provided with a pressure sealing working area and a heat melting working area. The sealing mechanism includes a flexible pressure strip and a heating pressure plate. The flexible pressure strip can separate from the pressure sealing working area. There is a first channel between the flexible pressure strip and the pressure sealing working area on the separation path. The heating pressure plate can separate from the heat melting working area. There is a second channel between the heating pressure plate and the heat melting working area on the separation path. The second channel and the first channel are used for the bag opening of the packaging bag to pass through sequentially. There is a preset distance between the first channel and the second channel. The preset distance is used for the corresponding opening of the air passage head that extends into the bag opening.

2. The packaging bag sealing device according to claim 1, characterized in that: It also includes a first pressure plate and a second pressure plate. The first pressure plate has a first sliding groove on its end face facing the sealing working surface. A first sliding base and a first compression spring are disposed in the first sliding groove. One end of the first compression spring is fixedly connected to the first sliding groove, and the other end of the first compression spring is fixedly connected to one end of the first sliding base. The flexible pressure strip is installed on the other end of the first sliding base. A first protrusion is disposed in the groove opening of the first sliding groove. There is a first movable distance between the first protrusion and the bottom of the first sliding groove for the first compression spring to extend. A second protrusion is disposed on the first sliding base and located in the first sliding groove. The first protrusion is located on the moving path of the second protrusion. The heating pressure plate is installed on the end of the second pressure plate facing the sealing working surface.

3. The packaging bag sealing device according to claim 2, characterized in that: The second pressure plate has a second sliding groove on its end face facing the sealing working surface. A second sliding base and a second compression spring are arranged in the second sliding groove. One end of the second compression spring is fixed to the bottom of the second sliding groove, and the other end of the second compression spring is fixedly connected to one end of the second sliding base. An elastic pressure strip is installed on the other end of the second sliding base. The elastic pressure strip and the heating pressure plate are both corresponding to the hot melt working area. A third protrusion is arranged in the groove opening of the second sliding groove. There is a second moving distance between the third protrusion and the bottom of the second sliding groove for the second compression spring to extend. A fourth protrusion is arranged on the second sliding base in the second sliding groove. The third protrusion is located on the moving path of the fourth protrusion. The heating pressure plate is installed on the end of the second pressure plate facing the sealing working surface through a connecting column.

4. The packaging bag sealing device according to claim 3, characterized in that: Both the flexible pressure strip and the elastic pressure strip are elastic rubber blocks.

5. The packaging bag sealing device according to claim 3, characterized in that: It also includes a mounting bracket, the end of which facing the sealing working surface is provided with a first limiting groove and a second limiting groove, the first pressure plate is slidably connected to the first limiting groove, and the second pressure plate is slidably connected to the second limiting groove.

6. The packaging bag sealing device according to claim 5, characterized in that: It also includes a power mechanism, which includes a power motor, a power gear, a first rack, and a second rack. The power motor is mounted on the mounting bracket, and the power gear is coaxially fixedly connected to the motor shaft of the power motor. Both the first rack and the second rack mesh with the power gear, and the power gear is located between the first rack and the second rack. The first rack is slidably connected to the first limiting groove, and the second rack is slidably connected to the second limiting groove. The first pressure plate is mounted on the first rack, and the second pressure plate is mounted on the second rack.

7. A fruit and vegetable sealing packaging device, characterized in that: The invention includes a packaging machine and a packaging bag sealing device as described in any one of claims 1 to 6. The packaging machine includes an air inlet head, a working platform for placing the packaging bag, and a lifting mechanism for controlling the up and down movement of the air inlet head. The sealing working surface of the packaging bag sealing device is vertically arranged, and the heat-melting working area on the sealing working surface is located below the pressure sealing working area. The preset spacing in the packaging bag sealing device is located on the lifting path of the air inlet head. The working platform is located below the second channel in the packaging bag sealing device. There is a first height difference between the working platform and the first channel in the packaging bag sealing device. There is a second height difference between the bag opening of the packaging bag placed on the working platform and the working platform. The first height difference is smaller than the second height difference.

8. The fruit and vegetable sealing and packaging equipment according to claim 7, characterized in that: The lifting mechanism includes a telescopic cylinder, a lifting slide rail, and a lifting block. The cylinder body of the telescopic cylinder is installed on the packaging machine. The piston rod of the telescopic cylinder is fixedly connected to the lifting block. The air pipe head is installed on the lifting block. The lifting block is slidably connected to the lifting slide rail, which is vertically arranged.

9. The fruit and vegetable sealing and packaging equipment according to claim 7 or 8, characterized in that: The gas line head includes a vacuum head and an inflation head arranged side by side, with the vacuum head's suction end and the inflation head's exhaust end flush.

10. The fruit and vegetable sealing and packaging equipment according to claim 7, characterized in that: The packaging machine also includes an inclined platform, which is located at one end of the working platform near the sealing working surface and is located below the second channel.

Images