Fresh-keeping food packaging sealing device

Abstract

The present invention relates to the field of food packaging and sealing, and in particular to a fresh-keeping food packaging and sealing device, comprising a workbench, a conveyor belt is arranged inside the workbench, and limit blocks for placing food packaging bags are arranged at equal intervals on the surface of the conveyor belt, a support frame is fixedly arranged at the upper end of the workbench, a group of clamping mechanisms are symmetrically arranged inside the support frame, clamping cylinders are fixedly arranged on both sides of the support frame, and the output ends of the clamping cylinders are connected to the corresponding clamping mechanisms, a pushing cylinder is fixedly arranged at the center of the top of the support frame, and the output end of the pushing cylinder is connected to a central push rod, a sealing mechanism and a mouth-opening mechanism are arranged above the clamping mechanism, and the central push rod is synchronously driven and connected with the sealing mechanism and the mouth-opening mechanism. The present invention can tighten and straighten the bag mouth through the mouth-opening mechanism, so that the bag mouth is flat and there are no wrinkles, which is conducive to improving the heat sealing effect.

Description

Technical Field

[0001] The invention relates to the technical field of food packaging and sealing, and in particular to a fresh-keeping food packaging and sealing device. Background Art

[0002] Sealing machines are machines that seal containers containing products. After the products are placed in the packaging containers, the containers need to be sealed to preserve the products, maintain product quality, and avoid product loss. At present, when packaging and sealing foods that require high freshness, such as vegetables, fruits, and meat, the food is generally filled into packaging bags, and then the packaging bags are evacuated to vacuum. Vacuum packaging helps to preserve the freshness of fresh foods and protect their appearance. Finally, the packaging bags are heat-sealed.

[0003] In the prior art, since fresh food is easily piled up at the bottom of the packaging bag, the packaging bag is prone to twisting and deformation, especially at the bag opening where wrinkles are most likely to occur. During the vacuuming and heat-sealing process, any tiny wrinkles at the bag opening will affect the sealing performance, and ultimately seriously affect the food preservation effect in the packaging bag. Summary of the invention

[0004] The purpose of the present invention is to provide a fresh-keeping food packaging sealing device, aiming to solve the above technical problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A fresh-keeping food packaging and sealing device comprises a workbench, a conveyor belt is arranged inside the workbench, and limit blocks for placing food packaging bags are arranged at equal intervals on the surface of the conveyor belt; a support frame is fixedly arranged at the upper end of the workbench, and a group of clamping mechanisms are symmetrically arranged inside the support frame; clamping cylinders are fixedly arranged on both sides of the support frame, and the output ends of the clamping cylinders are connected to the corresponding clamping mechanisms; a pushing cylinder is fixedly arranged at the center of the top end of the support frame, and the output end of the pushing cylinder is connected to a central push rod; a sealing mechanism and a mouth-opening mechanism are arranged above the clamping mechanism, and the central push rod is synchronously driven and connected to the sealing mechanism and the mouth-opening mechanism.

[0007] The sealing mechanism includes a pair of sliding rods, both ends of the sliding rods are fixedly connected to the supporting frame, a fixed plate is arranged between the centers of the sliding rods, a group of sliding plates are symmetrically arranged on both sides of the fixed plate, the sliding plates are slidably sleeved on the sliding rods, the bottom of the sliding plates are fixedly connected to the heat sealing plates through connecting rods, the heat sealing plates are located on both sides of the top of the food packaging bag, a screw sleeve is rotatably installed in the center of the fixed plate, a rotating plate is fixedly sleeved on the outside of the screw sleeve, both ends of the rotating plate are respectively rotatably connected to one end of the first connecting rod, and the other end of the first connecting rod is rotatably matched with the corresponding sliding plate, and a threaded portion is arranged on the center push rod, and the threaded portion passes through the screw sleeve along the axis thread.

[0008] As a further solution of the present invention: the clamping mechanism includes a sliding bracket, the output end of the clamping cylinder is fixedly connected to the side wall of the sliding bracket, a group of clamping rollers are rotatably installed in the sliding bracket, the clamping rollers are symmetrically arranged up and down, one end of one of the clamping rollers is sleeved with a synchronous gear, the other end of the clamping roller is transmission-connected to another clamping roller through a synchronous belt, and the outer side of the clamping roller is wrapped with a rubber soft sleeve.

[0009] As a further solution of the present invention: a support slide is extended on the inner wall of the support frame, the bottom of the sliding bracket is slidably installed on the support slide, the upper end of the support slide is linearly provided with a tooth groove along the length direction, and the synchronous gear is meshed with the tooth groove.

[0010] As a further solution of the present invention: the opening mechanism includes a support plate, the top of the support plate is fixedly connected to the fixed plate, the center push rod slides through the center of the support plate, a connecting seat is provided at the bottom of the center push rod, and a group of mounting slides are symmetrically and slidably installed at both ends of the support plate, the inner wall of the mounting slide is rotatably connected to one end of the second connecting rod, and the other end of the second connecting rod is rotatably matched with the connecting seat, and an opening portion is extended from the outer wall of the mounting slide, and the opening portion is located at both ends of the bag opening of the food packaging bag.

[0011] As a further solution of the present invention: sliding grooves are provided at both ends of the bottom of the support plate, the top of the mounting slide is adapted to be slidably installed in the sliding grooves, a vacuum tube is provided inside the support portion, a vacuum nozzle is provided at the bottom of the vacuum tube, the top of the vacuum tube is connected to one end of the air guide branch pipe, an air pump is fixedly provided at the top of the support frame, the output end of the air pump is connected to the air suction pipe, and the other end of the air guide branch pipe is connected to the air suction pipe.

[0012] As a further solution of the present invention: the central push rod drives the opening parts on both sides to move toward each other to open the bag opening, and at the same time the central push rod drives the heat sealing plates on both sides to move toward each other to achieve packaging sealing, the movement direction of the opening part is parallel to the transportation direction of the food packaging bag, and the movement direction of the heat sealing plate is perpendicular to the transportation direction of the food packaging bag.

[0013] Beneficial effects of the present invention:

[0014] (1) By setting a clamping mechanism, a mouth-opening mechanism and a sealing mechanism, when working, the packaging bag filled with fresh-keeping food is placed in the limit block, and the packaging bag is driven by the conveyor belt to move between the clamping mechanisms on both sides. The packaging bag is clamped and fixed by the clamping mechanism to prevent shaking, and then the central push rod is driven by the push cylinder. During the downward movement of the central push rod, it will drive the mouth-opening mechanism to straighten the mouth of the packaging bag, so that the bag mouth is flat due to tension. At the same time, the central push rod will drive the sealing mechanism to heat-seal the opened bag mouth. The heat-sealed food packaging bag continues to be transported forward by the conveyor belt to unload the material, thereby realizing the integrated automatic processing process of automatic clamping of the fresh-keeping food packaging bag, bag mouth flattening and packaging sealing, and the sealing efficiency is high.

[0015] (2) By setting up a mouth-opening mechanism, when preparing for heat sealing, the cylinder drives the central push rod to move straight downward. At this time, the connecting seat at the bottom of the central push rod will drive the mounting slides on both sides to move away from each other through the second connecting rod until the opening parts on both sides contact the bag opening. The central push rod continues to move downward, and the opening part stretches the bag opening tightly and straightens it, making the bag opening flat and free of wrinkles, which is beneficial to improving the heat sealing effect. At the same time, when the opening part is moving, the vacuum pump will evacuate air through the air guide branch pipe, so that the vacuum pipe will continuously evacuate the inside of the packaging bag. Subsequently, the heat sealing plates on both sides will promptly perform heat sealing on the vacuumized packaging bag.

[0016] (3) By setting up a clamping mechanism, when the food packaging bag is conveyed between the clamping mechanisms on both sides, the clamping cylinder will push the sliding bracket inward, and the sliding bracket will slide along the inner side of the support slide until the clamping roller contacts the packaging bag. During this process, the synchronous gear will roll along the tooth groove meshing, so that the clamping roller below rotates, and the clamping roller below will drive the clamping roller above to rotate synchronously through the synchronous belt, so that the clamping roller will keep rotating downward while contacting the packaging bag, so that the packaging bag can be clamped by the clamping rollers that are close to each other, and the food squeezed to the bag opening can be guided downward by the downward flipping of the clamping roller, so that the bag opening can leave space to facilitate subsequent straightening and heat sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the workbench in the present invention.

[0020] Figure 3 It is a structural schematic diagram of the clamping mechanism in the present invention.

[0021] Figure 4 It is a structural schematic diagram of the pushing cylinder in the present invention.

[0022] Figure 5 It is a structural schematic diagram of the sealing mechanism in the present invention.

[0023] Figure 6 It is a schematic diagram of the installation of the screw sleeve in the present invention.

[0024] Figure 7 It is a structural schematic diagram of the opening support mechanism in the present invention.

[0025] Figure 8 It is a schematic diagram of the installation of the vacuum tube in the present invention.

[0026] In the figure: 1, workbench; 2, conveyor belt; 3, limit block; 4, support frame; 401, clamping cylinder; 402, support slide; 403, tooth groove; 5, clamping mechanism; 501, sliding bracket; 502, clamping roller; 503, rubber soft sleeve; 504, synchronous gear; 505, synchronous belt; 6, push cylinder; 601, center push rod; 602, threaded part; 603, connecting seat; 7, vacuum pump; 70 1. Vacuum pipe; 8. Sealing mechanism; 801. Slide rod; 802. Fixed plate; 803. Sliding plate; 804. Connecting rod; 805. Heat sealing plate; 806. Rotating plate; 807. First connecting rod; 808. Screw sleeve; 9. Opening mechanism; 901. Support plate; 902. Mounting slide; 903. Second connecting rod; 904. Opening part; 905. Air guide branch pipe; 906. Vacuum pipe; 907. Slide groove. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 and Figure 4As shown, the present invention is a fresh-keeping food packaging and sealing device, comprising a workbench 1, a conveyor belt 2 is arranged inside the workbench 1, and limit blocks 3 for placing food packaging bags are arranged at equal intervals on the surface of the conveyor belt 2, a support frame 4 is fixedly arranged on the upper end of the workbench 1, a group of clamping mechanisms 5 are symmetrically arranged inside the support frame 4, clamping cylinders 401 are fixedly arranged on both sides of the support frame 4, and the output ends of the clamping cylinders 401 are connected to the corresponding clamping mechanisms 5, a pushing cylinder 6 is fixedly arranged at the center of the top of the support frame 4, and the output end of the pushing cylinder 6 is connected to the center push rod 601, a sealing mechanism 8 and a mouth-opening mechanism 9 are arranged above the clamping mechanism 5, and the center push rod 601 is synchronously driven and connected with the sealing mechanism 8 and the mouth-opening mechanism 9.

[0029] Specifically, by setting the clamping mechanism 5, the opening-stretching mechanism 9 and the sealing mechanism 8, when working, the packaging bag filled with fresh-keeping food is placed in the limit block 3, and the conveyor belt 2 is used to drive the packaging bag to move between the clamping mechanisms 5 on both sides, and the packaging bag is clamped and fixed by the clamping mechanism 5 to prevent shaking, and then the pushing cylinder 6 is used to drive the central push rod 601. During the downward movement of the central push rod 601, it will drive the opening-stretching mechanism 9 to straighten the opening of the packaging bag, so that the bag opening is flat due to tension. At the same time, the central push rod 601 will drive the sealing mechanism 8 to heat-seal the opened bag opening, and the heat-sealed food packaging bag continues to be transported forward by the conveyor belt 2, thereby realizing the integrated automatic processing process of automatic clamping of the fresh-keeping food packaging bag, bag opening flattening and packaging sealing, and the sealing efficiency is high.

[0030] like Figure 5 and Figure 6 As shown, the sealing mechanism 8 includes a pair of sliding rods 801, both ends of the sliding rods 801 are fixedly connected to the support frame 4, a fixed plate 802 is arranged between the centers of the sliding rods 801, a group of sliding plates 803 are symmetrically arranged on both sides of the fixed plate 802, the sliding plates 803 are slidably sleeved on the sliding rods 801, the bottom of the sliding plates 803 are fixedly connected to the heat sealing plates 805 through the connecting rods 804, the heat sealing plates 805 are located on both sides of the top of the food packaging bag, a screw sleeve 808 is rotatably installed in the center of the fixed plate 802, a rotating plate 806 is fixedly sleeved on the outer side of the screw sleeve 808, both ends of the rotating plate 806 are rotatably connected to one end of the first connecting rod 807 respectively, and the other end of the first connecting rod 807 is rotatably matched with the corresponding sliding plate 803, a threaded portion 602 is arranged on the center push rod 601, and the threaded portion 602 is threadedly penetrated in the screw sleeve 808 along the axis.

[0031] Specifically, by setting the sealing mechanism 8, when heat sealing is performed, the bag mouth of the food packaging bag is located between the heat sealing plates 805, and the push cylinder 6 drives the central push rod 601 to move downward in a straight line, and the bag mouth will be stretched and flattened by the opening mechanism 9. At the same time, during the downward movement of the central push rod 601, due to the threaded rotation of the threaded portion 602 and the screw sleeve 808, the threaded portion 602 will drive the screw sleeve 808 to rotate in the fixed plate 802, and the screw sleeve 808 will drive the rotating plate 806 to rotate, and the rotating plate 806 will drive the sliding plates 803 at both ends to slide along the slide bar 801 through the first connecting rod 807, so that the heat sealing plates 805 on both sides gradually approach until they are in contact, thereby realizing the automatic heat sealing process of the bag mouth. After the heat sealing is completed, the push cylinder 6 drives the central push rod 601 to move upward, and at this time, the screw sleeve 808 will drive the rotating plate 806 to rotate in the opposite direction, so that the heat sealing plates 805 on both sides move away from each other to prepare for the next heat sealing.

[0032] like Figure 3 As shown, the clamping mechanism 5 includes a sliding bracket 501, the output end of the clamping cylinder 401 is fixedly connected to the side wall of the sliding bracket 501, and a group of clamping rollers 502 are rotatably installed in the sliding bracket 501. The clamping rollers 502 are symmetrically arranged up and down, and one end of one of the clamping rollers 502 is sleeved with a synchronous gear 504, and the other end of the clamping roller 502 is transmission-connected to another clamping roller 502 through a synchronous belt 505. The outer side of the clamping roller 502 is wrapped with a rubber soft sleeve 503.

[0033] like Figure 2 As shown, a support slide 402 is extended on the inner wall of the support frame 4, and the bottom of the sliding bracket 501 is slidably installed on the support slide 402. A tooth groove 403 is linearly arranged on the upper end of the support slide 402 along the length direction, and the synchronous gear 504 is meshed with the tooth groove 403.

[0034] Specifically, by setting up the clamping mechanism 5, when the food packaging bag is conveyed between the clamping mechanisms 5 on both sides, the clamping cylinder 401 will push the sliding bracket 501 inward, and the sliding bracket 501 will slide along the inner side of the supporting slide 402 until the clamping roller 502 contacts the packaging bag. During this process, the synchronous gear 504 will mesh and roll along the tooth groove 403, so that the clamping roller 502 below rotates, and the clamping roller 502 below will drive the clamping roller 502 above to rotate synchronously through the synchronous belt 505, so that the clamping roller 502 can keep rotating downward while contacting the packaging bag, so that the packaging bag can be clamped by the clamping rollers 502 that are close to each other, and the downward turning of the clamping rollers 502 can be used to guide the food squeezed to the bag opening to the bottom, so that space can be left at the bag opening to facilitate subsequent straightening and heat sealing.

[0035] like Figure 7As shown, the opening mechanism 9 includes a support plate 901, the top of the support plate 901 is fixedly connected to the fixed plate 802, the center push rod 601 slides through the center of the support plate 901, and a connecting seat 603 is provided at the bottom of the center push rod 601. A group of mounting slides 902 are symmetrically slidably installed at both ends of the support plate 901. The inner wall of the mounting slide 902 is rotatably connected to one end of the second connecting rod 903, and the other end of the second connecting rod 903 is rotatably matched with the connecting seat 603. An opening portion 904 is extended from the outer wall of the mounting slide 902, and the opening portion 904 is located at both ends of the bag mouth of the food packaging bag.

[0036] like Figure 8 As shown, both ends of the bottom of the support plate 901 are provided with slide grooves 907, the top of the mounting slide 902 is adapted to be slidably installed in the slide grooves 907, a vacuum tube 906 is provided inside the support portion 904, a vacuum nozzle is provided at the bottom of the vacuum tube 906, the top of the vacuum tube 906 is connected to one end of the air branch pipe 905, an air pump 7 is fixedly provided on the top of the support frame 4, the output end of the air pump 7 is connected to the air pump 701, and the other end of the air branch pipe 905 is connected to the air pump 701.

[0037] Furthermore, the central push rod 601 drives the opening parts 904 on both sides to move toward each other to open the bag opening, and at the same time, the central push rod 601 drives the heat sealing plates 805 on both sides to move toward each other to achieve packaging sealing. The movement direction of the opening part 904 is parallel to the transportation direction of the food packaging bag, and the movement direction of the heat sealing plate 805 is perpendicular to the transportation direction of the food packaging bag.

[0038] Specifically, by setting the opening mechanism 9, when preparing for heat sealing, the cylinder 6 is pushed to drive the central push rod 601 to move downward in a straight line. At this time, the connecting seat 603 at the bottom of the central push rod 601 will drive the mounting slides 902 on both sides to move away from each other through the second connecting rod 903, until the opening parts 904 on both sides contact the bag opening, and the central push rod 601 continues to move downward, and the opening part 904 tightens and straightens the bag opening, so that the bag opening is flat and there is no wrinkle, which is beneficial to improve the heat sealing effect. At the same time, when the opening part 904 is moving, the vacuum pump 7 will evacuate air through the air guide branch pipe 905, so that the vacuum tube 906 continuously evacuates the packaging bag, and then the heat sealing plates 805 on both sides will also promptly perform heat sealing on the vacuumized packaging bag.

[0039] More specifically, after the sealing process is completed, the cylinder 6 is pushed to drive the central push rod 601 to move upward. At this time, the heat sealing plates 805 on both sides gradually open, and at the same time, the expansion parts 904 at both ends will gradually approach each other. During this process, the vacuum pump 7 continues to operate. At this time, the vacuum tube 906 will move along the sealing straight line with the expansion part 904, and use the high-speed flow of gas to continuously cool the sealing position, which plays a role in quickly cooling the seal and improving the sealing effect.

[0040] It should be noted that the expansion portion 904 in this embodiment is a long strip structure made of food-grade silicone material. Under the premise that the expansion portion 904 can effectively contact and straighten the bag opening, food safety can be effectively guaranteed even if the expansion portion 904 accidentally contacts the food. At the same time, the expansion portion 904 is arranged in a triangular shape on the outside, which can effectively improve the flatness of the expansion portion 904 when it is stretched and tightened with the bag opening.

[0041] The working principle of the present invention is as follows: Figure 1-Figure 8 As shown, when in use, when working, first place the packaging bag filled with fresh-keeping food in the limit block 3, and use the conveyor belt 2 to drive the packaging bag to move between the clamping mechanisms 5 on both sides, the clamping cylinder 401 will push the sliding bracket 501 inward, and the sliding bracket 501 will slide along the inner side of the supporting slide 402 until the clamping roller 502 contacts the packaging bag. During this process, the synchronous gear 504 will mesh and roll along the tooth groove 403, so that the clamping roller 502 below rotates, and the clamping roller 502 below will drive the clamping roller 502 above to rotate synchronously through the synchronous belt 505, so that the clamping roller 502 keeps rotating downward while contacting the packaging bag, so that the clamping roller 502 that is close to each other can achieve a clamping effect on the packaging bag, and the downward turning of the clamping roller 502 can also be used to guide the food squeezed to the bag opening to the bottom, so that the bag opening can leave space to facilitate subsequent straightening and heat sealing. When heat sealing is performed, the bag opening of the food packaging bag is located between the heat sealing plates 805, and the air cylinder 6 is pushed to drive the central push rod 601 to move downward in a straight line. At this time, the connecting seat 603 at the bottom of the central push rod 601 will drive the mounting slides 902 on both sides to move away from each other through the second connecting rod 903, until the opening parts 904 on both sides contact the bag opening, and the central push rod 601 continues to move downward, and the opening part 904 tightens and straightens the bag opening, so that the bag opening is flat and there is no wrinkle, which is beneficial to improve the heat sealing effect. At the same time, when the opening part 904 moves, the vacuum pump 7 will evacuate air through the air guide branch pipe 905, so that the vacuum pipe 906 continuously performs vacuum treatment on the packaging bag. At the same time, when the central push rod 601 moves downward, the threaded portion 602 will drive the screw sleeve 808 to rotate in the fixed plate 802, and the screw sleeve 808 will drive the rotating plate 806 to rotate. The rotating plate 806 will drive the sliding plates 803 at both ends to slide along the sliding rod 801 through the first connecting rod 807, so that the heat sealing plates 805 on both sides gradually approach until they are in contact, thereby realizing the automatic heat sealing process of the bag opening.

[0042] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A fresh-keeping food packaging and sealing device, comprising a workbench (1), a conveyor belt (2) arranged inside the workbench (1), and limit blocks (3) for placing food packaging bags arranged at equal intervals on the surface of the conveyor belt (2), characterized in that: A support frame (4) is fixedly arranged at the upper end of the workbench (1), a group of clamping mechanisms (5) are symmetrically arranged inside the support frame (4), clamping cylinders (401) are fixedly arranged on both sides of the support frame (4), the output end of the clamping cylinder (401) is connected to the corresponding clamping mechanism (5), a pushing cylinder (6) is fixedly arranged at the center of the top end of the support frame (4), the output end of the pushing cylinder (6) is connected to a central push rod (601), a sealing mechanism (8) and a mouth-opening mechanism (9) are arranged above the clamping mechanism (5), and the central push rod (601) is synchronously connected to the sealing mechanism (8) and the mouth-opening mechanism (9); The sealing mechanism (8) comprises a pair of sliding rods (801), both ends of the sliding rods (801) are fixedly connected to the support frame (4), a fixed plate (802) is arranged between the centers of the sliding rods (801), a group of sliding plates (803) are symmetrically arranged on both sides of the fixed plate (802), the sliding plates (803) are slidably sleeved on the sliding rods (801), the bottom of the sliding plate (803) is fixedly connected to the heat sealing plate (805) via a connecting rod (804), and the heat sealing plate (805) is located on the food packaging. On both sides of the top of the bag, a screw sleeve (808) is rotatably installed in the center of the fixed plate (802), and a rotating plate (806) is fixedly sleeved on the outside of the screw sleeve (808). The two ends of the rotating plate (806) are respectively rotatably connected to one end of the first connecting rod (807), and the other end of the first connecting rod (807) is rotatably matched with the corresponding sliding plate (803). The central push rod (601) is provided with a threaded portion (602), and the threaded portion (602) is threadedly penetrated into the screw sleeve (808) along the axis. The clamping mechanism (5) comprises a sliding bracket (501), the output end of the clamping cylinder (401) is fixedly connected to the side wall of the sliding bracket (501), a group of clamping rollers (502) are rotatably mounted in the sliding bracket (501), the clamping rollers (502) are symmetrically arranged up and down, one end of one of the clamping rollers (502) is sleeved with a synchronous gear (504), the other end of the clamping roller (502) is transmission-connected with another clamping roller (502) via a synchronous belt (505), and the outer side of the clamping roller (502) is wrapped with a rubber soft sleeve (503); A support slide (402) is extended on the inner wall of the support frame (4), the bottom of the sliding bracket (501) is slidably mounted on the support slide (402), a tooth groove (403) is linearly arranged at the upper end of the support slide (402) along the length direction, and the synchronous gear (504) is meshed with the tooth groove (403).

2. A fresh-keeping food packaging and sealing device according to claim 1, characterized in that: The opening mechanism (9) comprises a support plate (901), the top of the support plate (901) is fixedly connected to the fixed plate (802), the central push rod (601) slides through the center of the support plate (901), a connecting seat (603) is provided at the bottom of the central push rod (601), a group of mounting slides (902) are symmetrically slidably installed at both ends of the support plate (901), the inner wall of the mounting slide (902) is rotatably connected to one end of the second connecting rod (903), the other end of the second connecting rod (903) is rotatably matched with the connecting seat (603), and an opening portion (904) is extended on the outer wall of the mounting slide (902), and the opening portion (904) is located at both ends of the bag opening of the food packaging bag.

3. A fresh-keeping food packaging and sealing device according to claim 2, characterized in that: Slide grooves (907) are arranged at both ends of the bottom of the support plate (901), the top of the mounting slide seat (902) is adapted to be slidably mounted in the slide grooves (907), a vacuum tube (906) is arranged inside the support portion (904), a vacuum nozzle is arranged at the bottom of the vacuum tube (906), the top of the vacuum tube (906) is connected to one end of the air guide branch tube (905), an air pump (7) is fixedly arranged at the top of the support frame (4), the output end of the air pump (7) is connected to the air extraction tube (701), and the other end of the air guide branch tube (905) is connected to the air extraction tube (701).

4. A fresh-keeping food packaging and sealing device according to claim 3, characterized in that: The central push rod (601) drives the opening portions (904) on both sides to move towards each other to open the bag opening, and at the same time, the central push rod (601) drives the heat sealing plates (805) on both sides to move towards each other to achieve packaging sealing, the movement direction of the opening portions (904) is parallel to the transportation direction of the food packaging bag, and the movement direction of the heat sealing plates (805) is perpendicular to the transportation direction of the food packaging bag.

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