A nitrogen filling and fresh-keeping packaging device for food processing

Abstract

The present invention specifically relates to a nitrogen filling and fresh-keeping packaging device for food processing, and relates to the technical field of food processing. The device comprises a mounting frame, an upper crossbeam arranged on the upper side of the mounting frame, a box body is arranged for placing food packaging bags, and an upper closing cover is used to cover a closed box cavity to form a closed box cavity, so that it is not easy for harmful gases generated by nitrogen or heat sealing to escape in the later stage, and an upper bag opening adsorption plate installed at the telescopic end of a second vertical telescopic rod elastically presses against the upper side of the packaging bag for adsorption, and then rises to open the bag, so that the cannula of the inflation component can be more conveniently inserted into the opening of the packaging bag. At this time, the bag opening adsorption plate moves downward again to reduce the opening size of the packaging bag, so as to prevent the opening of the packaging bag from being too large and the nitrogen gas inflated by the cannula from escaping excessively. At this time, the box cavity is evacuated by the vacuum component, so that the air in the packaging bag can be quickly and completely extracted, and the cannula can quickly inflate the packaging bag with nitrogen to expand it, so as to ensure the nitrogen concentration content of the inflation inside the packaging bag.

Description

Technical Field

[0001] The present invention specifically relates to a nitrogen-filled fresh-keeping packaging device for food processing, and relates to the technical field of food processing. Background Art

[0002] In food processing and packaging, nitrogen filling fresh-keeping packaging devices are widely used in fresh-keeping packaging of various foods. The basic principle is to use the inertness of nitrogen to remove oxygen in the packaging bag, thereby inhibiting the growth of microorganisms and food oxidation, and extending the shelf life of food. When the existing equipment fills the food packaging bag with nitrogen, due to the shape of the packaging bag, the internal structure and the fluidity characteristics of the gas, the internal air is not easy to be completely discharged, and the residual air will contain oxygen, which will reduce the effect of nitrogen filling and fresh-keeping. When nitrogen is filled, nitrogen is easy to escape to the outside from the larger opening, which not only wastes nitrogen resources, but also cannot guarantee the nitrogen content in the packaging bag, thereby affecting the fresh-keeping effect. In addition, when heat-sealing the packaging bag mouth, the current equipment cannot simultaneously perform effective heat sealing and synchronously collect the gas generated during heat sealing. The use effect of the equipment is not good, and the quality of food fresh-keeping packaging is difficult to be reliably guaranteed. At the same time, the flexibility of the equipment is also limited, and it cannot well adapt to the needs of different foods and different packaging bag specifications.

[0003] In summary, the existing food processing nitrogen filling fresh-keeping packaging device has many problems in air exhaust, packaging bag sealing and heat sealing operations, and the use effect and flexibility of the equipment need to be improved. Therefore, it is necessary to propose a food processing nitrogen filling fresh-keeping packaging device to improve the above problems. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a nitrogen-filled fresh-keeping packaging device for food processing to solve the problems mentioned in the above background technology.

[0005] In order to achieve the above-mentioned object, the present invention is realized by the following technical scheme: a nitrogen filling fresh-keeping packaging device for food processing, comprising a mounting frame, an upper crossbeam arranged on the upper side of the mounting frame, a placing box body is installed on the mounting frame, a first vertical telescopic rod is vertically installed in the middle of the upper crossbeam, and an upper closing cover for covering the upper side of the placing box body is installed at the telescopic end of the first vertical telescopic rod to form a closed box cavity;

[0006] The bottom of the placing box body is provided with a bottom plate, a lower heat sealing plate and a lower bag opening adsorption plate are installed on one side of the bottom plate, the lower bag opening adsorption plate is used to adsorb the bottom of the packaging bag, and a movable placement component for placing the packaging bag is slidable left and right on the other side of the bottom plate;

[0007] A second vertical telescopic rod is vertically installed on one side of the upper closing cover, and a linkage component for heat-sealing and opening the packaging bag is installed at the telescopic end of the second vertical telescopic rod;

[0008] The right side of the mounting frame is provided with an inflating assembly which can be slidably inserted into the placement box to inflate the packaging bag with nitrogen;

[0009] The bottom plate is provided with a plurality of air extraction holes, and the lower side of the mounting frame is provided with an air extraction component connected to the air extraction holes;

[0010] The linkage assembly includes a mounting rod longitudinally mounted at the telescopic end of the second vertical telescopic rod, an upper heat sealing plate corresponding to the lower heat sealing plate is mounted at the bottom of the mounting rod, an L-shaped connecting rod is fixedly arranged on one side of the mounting rod, and a movable tube is vertically slidably penetrated through the end of the L-shaped connecting rod, an upper bag opening adsorption plate corresponding to the lower bag opening adsorption plate is mounted at the bottom of the movable tube, the upper bag opening adsorption plate is used for elastically adsorbing the upper side surface of the packaging bag, the upper bag opening adsorption plate is lower than the horizontal line of the upper heat sealing plate, and is used for contacting the packaging bag in advance.

[0011] A further improvement based on the above technical solution is that the top of the movable tube is slid through by an upper closing cover, and a baffle is integrally provided at the middle of the movable tube, the baffle is clamped on the upper side of the L-shaped connecting rod, and the baffle and the upper side of the L-shaped connecting rod are higher than the horizontal position of the mounting rod, when the L-shaped connecting rod rises, the baffle can be lifted to allow the packaging bag adsorbed by the bag opening adsorption plate at the bottom end of the movable tube to open.

[0012] A further improvement based on the above technical solution is that a first return spring is provided on the movable tube between the baffle and the upper closing cover, and a second return spring is provided on the movable tube between the upper bag opening adsorption plate and the L-shaped connecting rod, and the upper bag opening adsorption plate adaptively contacts the packaging bag under the elastic states of the first return spring and the second return spring.

[0013] A further improvement based on the above technical solution is that the movable placement component includes a push plate slidably arranged on the upper side of the bottom plate, and an L-shaped inclined placement plate for placing the packaging bag is fixedly provided on one side of the push plate, and a transverse telescopic rod is laterally installed on the left side of the placement box body, and the telescopic end of the transverse telescopic rod is locked and connected to one side of the L-shaped inclined placement plate.

[0014] A further improvement based on the above technical solution is that the inclination angle of the L-shaped inclined plate is 5-45°, a telescopic plug plate is slidably inserted into the inner side of the upper end of the L-shaped inclined plate, and tightening screws for tightening the side of the telescopic plug plate are installed on the front and rear sides of the L-shaped inclined plate.

[0015] A further improvement based on the above technical solution is that a plurality of ball bearings are rotatably embedded in the upper side of the bottom plate, and are in rolling contact with the bottom of the L-shaped inclined plate through the ball bearings. A plurality of spacing grooves are opened on both sides of the middle part of the bottom plate, and each exhaust hole is located on the inner side of the spacing groove.

[0016] A further improvement based on the above technical solution is that the inflation assembly includes a cannula and a nitrogen tank. The cannula slides through the right side of the box body and is located in the box cavity. The cannula is arranged between the lower heat sealing plate and the upper heat sealing plate, and the cannula is connected to the nitrogen tank.

[0017] A further improvement based on the above technical solution is that a guide slide rod and a screw rod are installed horizontally on the right side of the mounting frame, and a sliding seat is provided through the guide slide rod and the screw rod, wherein the screw rod is threadedly connected to the sliding seat, and the mounting frame is installed with a driving motor for driving the screw rod to rotate, and a connecting air pipe is installed horizontally in the middle of the sliding seat, the right end of the connecting air pipe is connected to the nitrogen tank outlet valve through the air pipe, and the left end of the connecting air pipe is connected to the intubation flange, so as to realize the left and right movable displacement of the intubation tube on one side of the box cavity.

[0018] A further improvement based on the above technical solution is that a conical tube head and a front sealing plate are installed at the front end of the cannula, the front sealing plate is used to be placed closely against the inner wall of the box body, and a rear sealing plate is fixed in the middle of the cannula for being placed closely against the outer surface of the box body.

[0019] A further improvement based on the above technical solution is that the exhaust assembly includes a conical bucket and a filtering vacuum cleaner, the top of the conical bucket is connected to the bottom plate where the box body is placed, and is connected to each exhaust hole, the bottom of the conical bucket is connected to an exhaust pipe, and is connected to the filtering vacuum cleaner through the exhaust pipe.

[0020] By adopting the above technical solution, the present invention has the following advantages:

[0021] The present invention is provided with a placing box body for placing the food packaging bag, and the upper closing cover is used to cover the closed box cavity, which is not easy to let the harmful gas generated by the nitrogen or heat sealing in the later stage escape, and cooperates with the upper bag opening adsorption plate installed at the telescopic end of the second vertical telescopic rod to elastically press against the upper side of the packaging bag for adsorption, and then rises to open the bag, so that the cannula of the inflation component can be more conveniently inserted into the opening of the packaging bag. At this time, the bag opening adsorption plate moves downward again to reduce the opening size of the packaging bag, so as to prevent the packaging bag from opening too large and the nitrogen gas injected by the cannula from escaping excessively, and the packaging bag opening can be close to the surface of the cannula to improve the connection density between them. At this time, the box cavity is evacuated by the vacuum component, so that the air in the packaging bag can be quickly and completely evacuated, and the cannula can quickly inflate the packaging bag with nitrogen to make it expand, so as to ensure the nitrogen concentration content of the inflation inside the packaging bag and improve the preservation effect of food.

[0022] Furthermore, after the inflation is completed, the first vertical telescopic rod can be pushed downward continuously, so that the upper bag opening suction plate of the movable tube can more tightly hold the bag opening of the inflated bag under the double elastic force of the first return spring and the second return spring, so as to reduce the amount of nitrogen escaping and avoid excessive force causing wear of the suction plate and the surface of the bag, until the upper heat sealing plate is pressed down to the upper side of the lower heat sealing plate to heat-seal the bag. Therefore, the above structures cooperate with each other to improve the inflation effect and efficiency of nitrogen.

[0023] Secondly, since a movable placement component is provided in the placement box body for placing the packaging bag containing food, the L-shaped inclined placement plate is inclinedly arranged, so that the side of the packaging bag containing food can be placed, so that the food is concentrated at the lower position of the L-shaped inclined placement plate, and it is not easy to escape from the bag mouth of the packaging bag, thereby improving the stability of the inflation and heat sealing work; and the entire L-shaped inclined placement plate is arranged to be able to move left and right on the bottom plate under the telescopic effect of the transverse telescopic rod, so as to adjust the appropriate position to be suitable for placing food packaging bags of different specifications, and has good flexibility;

[0024] Furthermore, a retractable plug plate is inserted into one end of the L-shaped inclined placement plate to adjust the extension length according to the use requirements. The increase in the length of the inclined surface can better prevent food from falling out of the opening of the packaging bag. It can also be used to place packaging bags of different specifications and packaging bags containing different contents of food, thereby improving the use effect.

[0025] Ball bearings and spacing grooves are arranged on the bottom plate. The ball bearings make the sliding of the entire L-shaped inclined plate smoother and smoother. Combined with the setting of the spacing grooves, the vacuum holes can be prevented from being completely blocked by the lower side of the packaging bag or the L-shaped inclined plate during vacuuming, thereby affecting the vacuuming effect of the vacuum assembly, making the entire equipment work more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the present invention in use state;

[0029] Figure 3 This is a schematic diagram of the structure of the box body and the inflation component of the present invention;

[0030] Figure 4 It is a structural schematic diagram of the air extraction component of the present invention;

[0031] Figure 5 It is a structural schematic diagram of the bottom plate and the movable placement assembly of the present invention;

[0032] Figure 6 It is a schematic diagram of the local structure of the present invention;

[0033] Figure 7 It is a schematic diagram of the use state of the second vertical telescopic rod of the present invention being telescoped downward;

[0034] Figure 8 It is a structural schematic diagram of the cannula of the present invention;

[0035] In the figure: mounting frame 1, upper crossbeam 2, first vertical telescopic rod 21, jack 22, placing box body 3, box cavity 30, bottom plate 31, exhaust hole 311, lower heat sealing plate 32, lower bag opening adsorption plate 33, ball 34, spacing groove 35, upper closing cover 4, second vertical telescopic rod 41, mounting rod 42, upper heat sealing plate 43, L-shaped connecting rod 44, movable tube 45, baffle 46, upper bag opening adsorption plate 47, first return spring 48, second return spring Spring 49, inflation component 5, nitrogen tank 50, guide slide rod 51, screw 52, ​​drive motor 521, sliding seat 53, connecting air pipe 54, cannula 55, conical pipe head 551, front sealed plate 552, rear sealed plate 553, exhaust component 6, conical bucket 61, exhaust pipe 62, filter dust collector 63, movable placement component 7, push plate 71, L-shaped inclined placement plate 72, transverse telescopic rod 73, telescopic plug plate 74, tightening screw 75. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0037] like Figure 1-8As shown, the present invention provides a technical solution of a nitrogen filling and fresh-keeping packaging device for food processing, comprising a mounting frame 1, an upper crossbeam 2 arranged on the upper side of the mounting frame 1, a placing box body 3 is installed on the mounting frame 1, a first vertical telescopic rod 21 is vertically installed in the middle of the upper crossbeam 2, and an upper closing cover 4 for covering the upper side of the placing box body 3 is installed at the telescopic end of the first vertical telescopic rod 21 to form a closed box cavity 30. The closed box cavity 30 plays a role of a closed environment in the entire nitrogen filling and heat sealing process. When the packaging bag is filled with nitrogen, this A closed environment can prevent the rapid nitrogen and harmful gases from heat sealing from leaking to the outside, improve the environmental protection effect and allow the nitrogen to be fully filled into the packaging bag. In this way, when the vacuum component 6 extracts air through the vacuum hole 311 at the bottom of the box body 3, the closed box cavity 30 can prevent the outside air from entering, so that the internal air pressure can be reduced as expected, thereby creating favorable air pressure conditions for the smooth filling of nitrogen; moreover, the placement of the box body 3 provides a stable placement position for the packaging bag, and the formation of the closed box cavity 30 further fixes the position of the packaging bag. When performing operations such as bag opening, nitrogen filling and heat sealing, the packaging bag will not shift due to external interference such as airflow, vibration, etc., ensuring the accuracy of each operation. Similarly, during the heat sealing process, the closed environment can ensure that the upper heat sealing plate 43 and the lower heat sealing plate 32 can accurately align with the bag opening of the packaging belt, improving the quality and accuracy of heat sealing;

[0038] In addition, a bottom plate 31 is provided at the bottom of the placing box body 3, which serves as a bottom supporting structure for placing the box body 3 and provides a stable foundation for the entire operation. A lower heat sealing plate 32 and a lower bag opening adsorption plate 33 are installed on one side of the bottom plate 31. The lower bag opening adsorption plate 33 is used to adsorb the bottom of the packaging bag. A movable placement component 7 for placing the packaging bag is slidable left and right on the other side of the bottom plate 31. It can adapt to packaging bags of different specifications, facilitate the placement and adjustment of the position of the packaging bags, and improve the compatibility of the entire device with different packaging bags. A second vertical telescopic rod 41 is vertically installed on one side of the upper closing cover 4 The telescopic end of the second vertical telescopic rod 41 is installed with a linkage component for heat sealing and opening the packaging bag; the right side of the mounting frame 1 is installed with an inflation component 5 that can slide into the placement box 3 to inflate the packaging bag with nitrogen, and the nitrogen in the nitrogen tank is filled into the packaging bag through the connecting air pipe, thereby improving the filling efficiency and accuracy of the nitrogen, thereby ensuring the concentration of the nitrogen in the packaging bag and achieving the purpose of preserving food; the bottom plate 31 is provided with a plurality of exhaust holes 311, and the lower side of the mounting frame 1 is provided with an exhaust component 6 connected to the exhaust holes 311, which can extract the air in the packaging bag.

[0039] The upper and lower heat-sealing plates 43 are connected to each other with the upper and lower heat-sealing plates 32 to form a seal. During the bag opening operation, the upper bag opening adsorption plate 47 works in coordination to stabilize the position of the packaging bag and prevent the packaging bag from shifting during the bag opening, inflation or heat sealing process, thereby ensuring the accuracy of the operation; at the same time, the adsorption effect helps to keep the packaging bag flat, which is beneficial to subsequent operations. The upper bag opening adsorption plate 47 can elastically adsorb the upper side of the packaging bag. The upper bag opening adsorption plate 47 is lower than the horizontal line of the upper heat sealing plate 43 and can contact the packaging bag in advance. When opening the bag, the upper bag opening adsorption plate 47 can adsorb and open the upper side of the packaging bag under the action of the adsorption force. Before and during heat sealing, it can position and fix the packaging bag to prevent the packaging bag from moving during the heat sealing process, thereby ensuring the accuracy of the heat sealing.

[0040] In this embodiment, the top of the movable tube 45 is slidably penetrated by the upper closing cover 4, so that the L-shaped connecting rod 44 and the upper bag-opening adsorption disk 47 can achieve the effect of stabilizing the upward and downward sliding displacement, and a baffle 46 is integrally provided in the middle of the movable tube 45, and the baffle 46 is clamped on the upper side of the L-shaped connecting rod 44. When the L-shaped connecting rod 44 rises, the baffle 46 can be lifted to allow the packaging bag adsorbed by the upper bag-opening adsorption disk 47 at the bottom of the movable tube 45 to open, and the baffle 46 and the upper side of the L-shaped connecting rod 44 are higher than the horizontal position of the mounting rod 42. In this way, when the mounting rod 42 moves downward, the movable tube 45 slides upward, and the lower side of the L-shaped connecting rod 44 can provide a movable space for the upper bag-opening adsorption disk 47.

[0041] Among them, a first return spring 48 is sleeved on the movable tube 45 between the baffle 46 and the upper closing cover 4, and a second return spring 49 is sleeved on the movable tube 45 between the upper bag opening adsorption plate 47 and the L-shaped connecting rod 44. The upper bag opening adsorption plate 47 adaptively contacts the packaging bag in the elastic state of the first return spring 48 and the second return spring 49, which can not only prevent the excessive force from wearing the packaging bag, but also can compress the opening of the packaging belt to improve the inflation and heat sealing effects of the packaging bag;

[0042] The cam 72 is provided with an L-shaped support plate 72 on one side of the bottom plate 31 so as to prevent the bag from falling into the bag and causing the bag to be easily moved.

[0043] In this embodiment, the inflation component 5 includes a cannula 55 and a nitrogen tank 50. The cannula 55 is slidably passed through the right side of the box body 3 and is located in the box cavity 30. The cannula 55 is arranged between the lower heat sealing plate 32 and the upper heat sealing plate 43. The specific position is closer to the lower heat sealing plate 32 and is staggered with each other. The cannula 55 is connected to the nitrogen tank 50. The inflation speed of the cannula 55 can be greater than the exhaust speed of the exhaust component 6, which makes it easier to expand the packaging bag. In order to realize the left and right sliding displacement of the cannula 55, a guide slide bar 51 and a screw are installed horizontally on the right side of the mounting frame 1. 52, and the guide slide rod 51 and the screw rod 52 are both penetrated by a sliding seat 53, wherein the screw rod 52 is threadedly connected to the sliding seat 53, the mounting frame 1 is installed with a driving motor 521 for driving the screw rod 52 to rotate, and a connecting air pipe 54 is horizontally installed in the middle of the sliding seat 53, the right end of the connecting air pipe 54 is connected to the outlet valve of the nitrogen tank 50 through the air pipe, and the left end of the connecting air pipe 54 is flange-connected to the cannula 55, and the moving position of the cannula 55 is accurately controlled by the rotation of the screw rod 52, so as to realize the movable displacement of the cannula 55 on one side of the box cavity 30.

[0044] Furthermore, a conical tube head 551 and a front sealing plate 552 are installed at the front end of the insertion tube 55. The conical tube head 551 is easier to penetrate into the opening of the opened packaging bag. When the insertion tube 55 is reset to the right, the front sealing plate 552 is used to be placed closely against the inner wall of the box body 3 to improve the tightness of the connection. A rear sealing plate 553 is fixedly provided in the middle of the insertion tube 55. When the insertion tube 55 is displaced to the left and inserted into the opening of the packaging bag, it can be placed closely against the outer surface of the box body 3 to improve the tightness of the connection.

[0045] The exhaust assembly 6 includes a conical hopper 61 and a filtering dust collector 63. The top of the conical hopper 61 is connected to the bottom plate 31 on which the box body 3 is placed, and is connected to each exhaust hole 311. The bottom of the conical hopper 61 is connected to an exhaust pipe 62, and is connected to the filtering dust collector 63 through the exhaust pipe 62. The air in the box cavity 30 and the packaging bag can be extracted through the filtering dust collector 63, and the gas generated when the packaging bag is heat-sealed can be filtered and purified, providing a low-pressure environment while being more environmentally friendly.

[0046] In the above technical scheme, a plurality of ball bearings 34 are rotatably embedded in the upper side of the bottom plate 31, and are in rolling contact with the bottom of the L-shaped inclined plate 72 through the ball bearings 34. During the entire operation process, when the L-shaped inclined plate 72 slides on the bottom plate 31, since the plurality of ball bearings 34 rotatably embedded in the upper side of the bottom plate 31 are in rolling contact with the bottom of the L-shaped inclined plate 72, the provision of the ball bearings 34 improves the smoothness of the operation of the equipment, reduces the friction loss between components, and makes the sliding of the L-shaped inclined plate 72 smoother. A plurality of spacing grooves 35 are provided on both sides of the middle part of the bottom plate 31, and each exhaust hole 311 is respectively located on the inner side of the spacing groove 35, thereby avoiding the exhaust hole 311 from being completely blocked by the lower side of the packaging bag or the L-shaped inclined plate 72, thereby ensuring the exhaust effect of the exhaust component 6, thereby making the operation of the entire equipment more stable and reliable.

[0047] In a more specific implementation principle, the packaging bag containing food is placed on the L-shaped inclined placement plate 72 of the movable placement component 7. Since the inclination angle of the L-shaped inclined placement plate 72 is 5-45 degrees, the food will naturally be concentrated at the lower position of the L-shaped inclined placement plate 72. If the packaging bag is large or the food content is large, the extension length of the telescopic plug plate 74 can be adjusted, and the telescopic plug plate 74 can be fixed by tightening the top screw 75 to adapt to packaging bags of different specifications and food content, and to prevent the food from running out of the bag opening of the packaging bag. Then, the transverse telescopic rod 73 can be extended and retracted as needed to push the L-shaped inclined placement plate 72 to move left and right on the bottom plate 31, and can be flexibly adjusted to a suitable position so that the opening of the packaging bag is aligned with the position of subsequent operations, that is, the position between the upper heat sealing plate 43 and the lower heat sealing plate 32;

[0048] Then, the first vertical telescopic rod 21 is extended, so that the upper closing cover 4 covers the upper side of the box body 3, forming a closed box cavity 30, which can prevent the escape of nitrogen or harmful gases generated during heat sealing in subsequent operations. At this time, the second vertical telescopic rod 41 is extended, driving the linkage assembly to move downward, and the upper bag opening adsorption plate 47 in the linkage assembly elastically presses against the upper side of the packaging bag under the dual elastic action of the first return spring 48 and the second return spring 49. The lower bag opening adsorption plate 33 and the upper bag opening adsorption plate 47 adsorb the upper and lower sides of the packaging bag opening respectively under the action of the vacuum pump, and then the second vertical telescopic rod 41 retracts upward at this time, allowing the L-shaped connecting rod 44 to rise and lift the baffle 46 on the movable tube 45, so that the packaging bag opening adsorbed by the upper bag opening adsorption plate 47 at the bottom of the movable tube 45 is opened. Through this ingenious design, the stability and fixation of the packaging bag are guaranteed, and the bag opening can be smoothly realized, so as to prepare for the subsequent inflation operation.

[0049] After the bag is opened, the driving motor 521 drives the screw 52 to rotate, and the screw 52 and the sliding seat 53 are threadedly transmitted, so that the sliding seat 53 slides along the guide slide rod 51, thereby driving the insertion tube 55 to move toward the opening direction of the packaging bag. The conical tube head 551 at the front end of the insertion tube 55 is convenient for inserting into the opening of the packaging bag, and the rear sealing plate 553 in the middle of the insertion tube 55 is placed close to the outer surface of the box body 3 to ensure the airtightness of the box cavity 30; then, the filter dust collector 63 in the exhaust assembly 6 exhausts the box cavity 30 through the conical bucket 61 and the exhaust pipe 62, and the air is exhausted through the bottom plate 31. The through hole 311 is evacuated. As the air is evacuated, the nitrogen tank 50 reaches the insert tube 55 through the connecting air pipe 54. The insert tube 55 starts to fill the packaging bag with nitrogen. This low-pressure environment is conducive to the rapid filling of nitrogen into the packaging bag from the insert tube 55. When the air is effectively evacuated, the nitrogen is filled in time, so that the concentration of nitrogen in the packaging bag can reach the required level more quickly. Through the coordinated work of the exhaust component 6 and the filling component 5, the air in the packaging bag can be quickly and completely evacuated, and the concentration of nitrogen in the packaging bag is ensured, thereby improving the preservation effect of food.

[0050] After inflation is completed, the first vertical telescopic rod 21 continues to push downward, and the upper bag opening suction plate 47, under the dual elastic force of the first return spring 48 and the second return spring 49, more tightly supports the bag opening of the inflated packaging bag, reducing the amount of nitrogen escaping and avoiding excessive wear of the rubber suction cup and the surface of the packaging bag. As the first vertical telescopic rod 21 continues to push, the upper heat sealing plate 43 in the linkage assembly is pressed down to the upper side of the lower heat sealing plate 32 to heat-seal the packaging bag, and then each structure is reset. After the connecting air pipe 54 is reset to the right, the front sealing plate 552 is placed close to the inner wall of the box body 3 to maintain the tightness of the box cavity 30. Through this structural coordination, the inflation effect and efficiency of nitrogen are improved, and the quality of heat sealing is also guaranteed.

[0051] The above embodiments show and describe the basic principles and main features of the invention and the advantages of the invention. Those skilled in the art should understand that the invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the invention. Without departing from the spirit and scope of the invention, the invention may have various changes and improvements, which shall fall within the scope of the invention to be protected. The scope of protection of the invention shall be defined by the attached claims and their equivalents.

Claims

1. A nitrogen filling fresh-keeping packaging device for food processing, comprising a mounting frame (1), an upper crossbeam (2) arranged on the upper side of the mounting frame (1), characterized in that: A placement box body (3) is mounted on the mounting frame (1), a first vertical telescopic rod (21) is vertically mounted in the middle of the upper crossbeam (2), and an upper closing cover (4) for covering the upper side of the placement box body (3) is mounted at the telescopic end of the first vertical telescopic rod (21), thereby forming a closed box cavity (30); The bottom of the placement box body (3) is provided with a bottom plate (31), one side of the bottom plate (31) is provided with a lower heat sealing plate (32) and a lower bag opening adsorption plate (33), the lower bag opening adsorption plate (33) is used to adsorb the bottom of the packaging bag, and the other side of the bottom plate (31) is provided with a movable placement component (7) for placing the packaging bag in a sliding manner to the left and right; A second vertical telescopic rod (41) is vertically mounted on one side of the upper closing cover (4), and a linkage assembly for heat-sealing and opening the packaging bag is mounted on the telescopic end of the second vertical telescopic rod (41); The right side of the mounting frame (1) is provided with an inflating component (5) which can be slidably inserted into the placement box (3) to inflate the packaging bag with nitrogen; The bottom plate (31) is provided with a plurality of air extraction holes (311), and an air extraction assembly (6) connected to the air extraction holes (311) is provided on the lower side of the mounting frame (1); The linkage assembly comprises a mounting rod (42) longitudinally mounted on the telescopic end of the second vertical telescopic rod (41); an upper heat-sealing plate (43) corresponding to the lower heat-sealing plate (32) is mounted at the bottom of the mounting rod (42); an L-shaped connecting rod (44) is fixedly mounted on one side of the mounting rod (42); and a movable tube (45) is vertically slidably penetrated through the end of the L-shaped connecting rod (44); an upper bag-opening adsorption plate (47) corresponding to the lower bag-opening adsorption plate (33) is mounted at the bottom of the movable tube (45); the upper bag-opening adsorption plate (47) is used for elastically adsorbing the upper side of the packaging bag; the upper bag-opening adsorption plate (47) is lower than the horizontal line of the upper heat-sealing plate (43) and is used for contacting the packaging bag in advance; The movable placement assembly (7) comprises a push plate (71) slidably arranged on the upper side of the bottom plate (31), an L-shaped inclined placement plate (72) for placing packaging bags being fixedly arranged on one side of the push plate (71), a transverse telescopic rod (73) being transversely installed on the left side of the placement box body (3), and a telescopic end of the transverse telescopic rod (73) being locked and connected to one side of the L-shaped inclined placement plate (72).

2. A nitrogen filling and fresh-keeping packaging device for food processing according to claim 1, characterized in that: The top of the movable tube (45) is slidably penetrated by the upper closing cover (4), and a baffle (46) is integrally provided in the middle of the movable tube (45). The baffle (46) is clamped on the upper side of the L-shaped connecting rod (44), and the baffle (46) and the upper side of the L-shaped connecting rod (44) are higher than the horizontal position of the mounting rod (42). When the L-shaped connecting rod (44) rises, the baffle (46) can be lifted to allow the packaging bag adsorbed by the bag opening adsorption plate (47) at the bottom end of the movable tube (45) to be opened.

3. A nitrogen filling and fresh-keeping packaging device for food processing according to claim 2, characterized in that: A first return spring (48) is sleeved on the movable tube (45) between the blocking piece (46) and the upper closing cover (4), and a second return spring (49) is sleeved on the movable tube (45) between the upper bag opening adsorption plate (47) and the L-shaped connecting rod (44). The upper bag opening adsorption plate (47) adaptively contacts the packaging bag when the first return spring (48) and the second return spring (49) are in an elastic state.

4. A nitrogen filling and fresh-keeping packaging device for food processing according to claim 1, characterized in that: The L-shaped inclined placement plate (72) has an inclination angle of 5-45°, a telescopic plug plate (74) is slidably inserted into the inner side of the upper end of the L-shaped inclined placement plate (72), and tightening screws (75) for tightening the side surfaces of the telescopic plug plate (74) are installed on the front and rear sides of the L-shaped inclined placement plate (72).

5. A nitrogen filling and fresh-keeping packaging device for food processing according to claim 4, characterized in that: A plurality of balls (34) are rotatably embedded in the upper side of the bottom plate (31), and are in rolling contact with the bottom of the L-shaped inclined placement plate (72) through the balls (34). A plurality of spacing grooves (35) are provided on both sides of the middle of the bottom plate (31), and each of the air extraction holes (311) is located on the inner side of the spacing grooves (35).

6. A nitrogen filling and fresh-keeping packaging device for food processing according to claim 1, characterized in that: The inflation assembly (5) comprises a cannula (55) and a nitrogen tank (50); the cannula (55) slides through the right side of the placement box body (3) and is located in the box cavity (30); the cannula (55) is arranged between the lower heat sealing plate (32) and the upper heat sealing plate (43); and the cannula (55) is connected to the nitrogen tank (50).

7. A nitrogen filling and fresh-keeping packaging device for food processing according to claim 6, characterized in that: A guide slide bar (51) and a screw rod (52) are transversely mounted on the right side of the mounting frame (1), and a sliding seat (53) is provided through the guide slide bar (51) and the screw rod (52), wherein the screw rod (52) and the sliding seat (53) are threadedly connected, and a driving motor (521) for driving the screw rod (52) to rotate is mounted on the mounting frame (1), and a connecting air pipe (54) is transversely mounted in the middle of the sliding seat (53), wherein the right end of the connecting air pipe (54) is connected to the outlet valve of the nitrogen tank (50) through the air pipe, and the left end of the connecting air pipe (54) is flange-connected to the insert tube (55), so that the insert tube (55) can move left and right on one side of the box cavity (30).

8. A nitrogen filling and fresh-keeping packaging device for food processing according to claim 7, characterized in that: The front end of the insertion tube (55) is provided with a conical tube head (551) and a front sealing plate (552), the front sealing plate (552) being used to be placed in close contact with the inner wall of the box body (3), and the middle part of the insertion tube (55) is provided with a rear sealing plate (553) being used to be placed in close contact with the outer surface of the box body (3).

9. A nitrogen filling and fresh-keeping packaging device for food processing according to claim 1, characterized in that: The air extraction assembly (6) comprises a conical hopper (61) and a filtering dust collector (63); the top of the conical hopper (61) is connected to the bottom plate (31) on which the box body (3) is placed, and is in communication with each of the air extraction through holes (311); the bottom of the conical hopper (61) is connected to an air extraction pipe (62), and is connected to the filtering dust collector (63) via the air extraction pipe (62).

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