Sealing machine for food packaging

Abstract

The invention relates to the technical field of food packaging, in particular to a sealing machine for food packaging. Comprising a rack and a material pipe, and a vertical heat sealing mechanism and a transverse heat sealing mechanism are arranged on the rack; the transverse heat sealing mechanism comprises two transverse heat sealing machines, crow bars are rotationally installed on the machine frame and located below the two ends of the two transverse heat sealing machines, straight grooves are formed in the two ends of each crow bar, inserting rods are embedded in the straight grooves, the inserting rods in the straight grooves in the upper side are fixedly connected with the transverse heat sealing machines, and the inserting rods in the straight grooves in the lower side are fixedly connected with a moving plate moving horizontally. Flaring-shaped supporting hoppers are arranged on the opposite surfaces of the two groups of moving plates. The supporting hopper is used for clamping a formed packaging film, then a heat seal at the lower end of a packaging bag is isolated, food can only impact on the supporting hopper, and therefore the phenomena of material tensile deformation, sealing layer dislocation, even local cracking, falling-off and air leakage, liquid seepage or microbial contamination possibly caused by material impact are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of food packaging, and particularly to a sealing machine for food packaging. Background Art

[0002] With the rapid development of the quick-frozen food industry, hot pot ingredient foods represented by frozen dumplings and hot pot balls are widely favored by the market due to the convenience of eating, purchasing, and storing. Such foods need to be stored frozen for a long time, and have extremely high requirements for the sealing performance, impact resistance, and anti-leakage performance of the packaging bags. However, in the traditional packaging process, the dynamic cooperation between the food feeding link and the heat-sealing process often causes sealing defects, directly affecting the product quality and shelf life.

[0003] At present, vertical packaging machines have become the mainstream packaging equipment for quick-frozen foods due to their high-efficiency continuous operation characteristics. Its working process usually includes: winding film bag making, material filling, heat sealing and cutting, and finished product output. Among them, the heat-sealing mechanism consists of a heat-sealing strip and a cutter, and realizes the sealing and cutting of the packaging bag through instantaneous high-temperature pressing. However, during high-speed operation, quick-frozen foods, such as frozen dumplings and balls, are hard in texture. When falling from the feeding hopper into the packaging bag, due to the acceleration of gravity, a large impact force is generated, which directly acts on the heat-sealing area. At this time, if the heat-sealing part is not completely solidified because it is in a high-temperature molten state, or has been solidified, but is still affected by the material impact, it may cause stretching deformation of the material at the sealing position, misalignment of the sealing layer, or even local cracking, forming a "falling open" phenomenon, resulting in risks of air leakage, liquid leakage, or microbial contamination.

[0004] In the prior art, although this problem is alleviated by optimizing the heat-sealing temperature, extending the cooling time, or improving the toughness of the packaging material, the actual effect is limited due to the equipment cycle efficiency and cost control. In addition, simply reducing the feeding speed will significantly affect the packaging production capacity and is difficult to meet the needs of large-scale production.

[0005] Therefore, there is an urgent need for a device that can effectively isolate the material impact without sacrificing the equipment operation efficiency. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems existing in the prior art, and to propose a sealing machine for food packaging that can effectively isolate the material impact and reduce the probability of "falling open" of the packaging bag as much as possible without affecting the equipment operation efficiency.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions: A sealing machine for food packaging, including a frame and a material pipe, wherein a vertical heat-sealing mechanism for sealing the vertical edges of the packaging film and a horizontal heat-sealing mechanism for sealing the ports of the packaging film are provided on the frame; The transverse heat sealing mechanism includes two groups of transverse heat sealing machines, which are driven by a driving mechanism to move synchronously relative to or opposite to each other. A crowbar is rotatably installed on the frame below both ends of the two groups of transverse heat sealing machines. Both ends of the crowbar are provided with straight grooves, and plug rods are embedded in the straight grooves. The plug rods in the upper straight grooves are fixedly connected to the transverse heat sealing machines, and the plug rods in the lower straight grooves are fixedly connected to a horizontally movable plate. An expanded supporting bucket is provided on one opposite side of the two groups of movable plates, and the minimum diameter of the supporting bucket is located on the upper side of the lower end of the formed packaging film.

[0008] Preferably, the vertical heat sealing mechanism includes a film guiding tube fixed on a frame, the film guiding tube is sleeved on a material tube, a gap is set between an inner wall of the film guiding tube and an outer wall of the material tube, an opening is provided on the side of the film guiding tube away from the direction of introducing the packaging film, film guide plates for closing the vertical edges of the packaging film are provided on both sides of the opening, and vertical heat sealing machines that can be driven to move are provided on both sides of the opening on the frame, and notches are provided on the film guide plates.

[0009] Preferably, the horizontal cross-section of the film guide plate gradually closes away from the material pipe.

[0010] Preferably, the upper portion of the opening is flared.

[0011] Preferably, the horizontal heat sealing machine includes a symmetrically arranged mounting frame, an upper insertion rod is fixed to the end of the mounting frame, and a heat-insulating knife holder is suspended on the opposite side of the two sets of mounting frames, and an embedding groove is provided on the opposite side of the two knife holders, a fixed heat sealing knife is fixed in one embedding groove, and a movable heat sealing knife matching the fixed heat sealing knife is slidably installed in the other embedding groove, an elastic member is provided between the movable heat sealing knife and the corresponding embedding groove, a yield groove is provided on the end surface of the fixed heat sealing knife, and a cutting knife that penetrates the movable heat sealing knife is fixed in the embedding groove corresponding to the movable heat sealing knife.

[0012] Preferably, a guide hopper is rotatably mounted on the frame below the movable plate, two elastic members are provided between the guide hopper and the frame, a pry bar is rotatably mounted on the frame between the two groups of movable plates, the lower end of the pry bar abuts against the side of the guide hopper, and the upper end of the pry bar extends above the movable plate.

[0013] Preferably, the driving mechanism includes two groups of guide rods horizontally slidably mounted on the frame, the two groups of guide rods are respectively located on both sides of the mounting frame, the two ends of the two mounting frames are respectively slidably connected to the corresponding side guide rods, the guide rods are driven by a motor fixed to the frame via a crank slider mechanism, a slider is vertically slidably mounted on the frame at the center line of the two groups of horizontal heat sealing machines, two connecting rods are rotatably mounted on the slider, and the two connecting rods are respectively rotatably connected to the ends of the two groups of mounting frames.

[0014] Preferably, the lower ends of the two groups of transverse heat sealers are provided with clamping plates, the two clamping plates are folded in half, and the bending parts of the two clamping plates correspond to each other.

[0015] Preferably, a shoulder for spreading and guiding the packaging film is provided at the upper end of the film guiding tube.

[0016] Preferably, it further includes a film feeding mechanism for downwardly feeding the packaging film.

[0017] Compared with the prior art, the present invention provides a sealing machine for food packaging, having the following beneficial effects: 1. In the present invention, in order to relieve the impact of food falling on the heat-sealed port of the packaging bag, two sets of symmetrically arranged supporting hoppers are provided below the transverse heat-sealing mechanism. During feeding, the minimum diameters of the supporting hoppers are mutually abutted against the upper edge of the lower seal of the formed packaging film. By using the clamping effect of the supporting hoppers on the formed packaging film, the lower heat seal of the packaging bag is isolated. The food falls from the material pipe and can only impact on the supporting hoppers, thus avoiding the stretching deformation of the material at the seal, the misalignment of the sealing layer or even local cracking due to the impact of the material, forming a "falling open" phenomenon, resulting in risks of air leakage, liquid leakage or microbial contamination. And the two sets of supporting hoppers move closer and farther away as the transverse heat-sealing machine approaches and moves away, without the need for additional separate running time, thus not affecting the overall operation state of the equipment and the feeding progress.

[0018] 2. In the present invention, in order to further slow down the impact of the packaging bag after landing, a guiding hopper is rotatably installed on the frame below the supporting hopper, and a pry bar is rotatably installed between the two sets of moving plates on the frame, and the lower end of the pry bar abuts against the side of the guiding hopper. When the supporting hopper holds and clamps the packaging bag, the moving plate deflects against the upper end of the pry bar, thus pressing the end of the guiding hopper to sink, so that there is enough space for the natural sag of the packaging bag above the guiding hopper, so that the lower end of the packaging bag extends downward. When the two sets of supporting hoppers are separated and in the packaging falling position, the moving plate is separated from the pry bar, and the guiding hopper is lifted by the second elastic member, so that the guiding hopper is as close as possible to the packaging bag, reducing the falling height of the packaging bag, thus slowing down the impact of the packaging bag falling and reducing the probability of the seal bursting.

[0019] 3. In the present invention, a film guiding tube is provided. The side wall of the film guiding tube is provided with an opening penetrating up and down, and guiding film plates are provided on both sides of the opening, and the guiding film plates are provided with notches. The guiding film plates guide and clamp the vertical edges of both sides of the packaging film together; and due to the existence of the notches, the vertical heat-sealing machine can pass through the notches and print on the packaging film to perform vertical edge closing heat-sealing, so that the vertical edge ends of the packaging film will not loosen, thus avoiding the dispersion of the vertical edges during vertical edge closing heat-sealing and affecting the heat-sealing effect.

[0020] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent specification; and to some extent, based on the study of the following text, it will be obvious to those skilled in the art; or, it can be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view axial three-dimensional schematic diagram of the present invention.

[0022] Figure 2 It is a three-dimensional schematic diagram of the rear view axis of the present invention.

[0023] Figure 3 It is a three-dimensional schematic diagram of the present invention after removing the outer shell.

[0024] Figure 4 For the present invention Figure 3 Three-dimensional schematic diagram after removing the frame.

[0025] Figure 5 For the present invention Figure 3 Front view schematic diagram.

[0026] Figure 6 For the present invention Figure 5 Schematic diagram of the cross-section at A-A of the present invention.

[0027] Figure 7 For the present invention Figure 5 Schematic diagram of the cross-section at B-B of the present invention.

[0028] Figure 8 It is a schematic diagram of the installation and cooperation of the tool rest and the heat-sealing knife of the horizontal heat-sealing mechanism of the present invention.

[0029] Figure 9 It is a three-dimensional view, front view, and horizontal cross-sectional view of the film guiding tube and the vest of the present invention.

[0030] Figure 10 For the present invention Figure 4 Three-dimensional schematic diagram of the middle vertical heat-sealing mechanism.

[0031] Figure 11 For the present invention Figure 4 Three-dimensional schematic diagram of the middle packaging film conveying and guiding mechanism.

[0032] Figure 12 For the present invention Figure 6 Top plan view of the middle packaging film conveying and guiding mechanism.

[0033] Figure 13 For the present invention Figure 4 Three-dimensional schematic diagram of the cooperation between the middle horizontal heat-sealing mechanism and the hopper.

[0034] Figure 14 For the present invention Figure 13 Side plan view.

[0035] Figure 15 For the present invention Figure 4 Three-dimensional schematic diagram of the cooperation between the middle hopper and the material guiding hopper.

[0036] Figure 16 For the present invention Figure 15 Schematic diagram of the middle hopper and its driving and installation structure.

[0037] Figure 17 For the present invention Figure 14 Partial schematic view at position C.

[0038] Figure 18 Cross-sectional schematic view of the two sets of hoppers of the present invention in the closed state.

[0039] Figure 19 For the present invention Figure 4 Partial schematic view at position D in

[0040] In the figure: 1, frame; 2, control cabinet; 3, material pipe; 4, packaging film; 5, film outlet mechanism; 6, film guiding pipe; 7, vest; 8, vertical heat sealer; 9, opening; 10, film guiding plate; 11, first support; 12, first telescopic rod; 13, roller; 14, belt; 15, universal joint; 16, connecting rod; 17, gear; 18, auxiliary film feeding mechanism; 19, guiding cylinder; 20, guide rod; 21, mounting bracket; 22, horizontal heat sealer; 23, crank-slider mechanism; 24, connecting rod; 25, slider; 26, guide post; 27, moving plate; 28, guiding shaft; 29, hopper; 30, truss; 31, crowbar; 32, pry bar; 33, feeding hopper; 34, second elastic member; 35, clamping plate; 36, second support; 37, second telescopic rod; 38, notch; 2201, tool rest; 2202, fixed heat seal knife; 2203, moving heat seal knife; 2204, first elastic member; 2205, cutting knife; 2206, relief groove. Specific embodiments

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the attached Figure 1-19 drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0042] Embodiment 1. In order to achieve reducing the probability of stretching deformation, misalignment of the sealing layer or even local cracking at the sealing position caused by the impact of materials under the premise of minimizing the impact on the packaging efficiency of the equipment, the present embodiment provides a sealing machine for food packaging, including a frame 1 and a material pipe 3 arranged on the side of the frame 1. It is characterized in that a vertical heat sealing mechanism for vertically sealing the vertical edges of the packaging film 4 and a horizontal heat sealing mechanism for sealing the ports of the packaging film 4 are provided on the frame 1; The transverse heat sealing mechanism includes two groups of transverse heat sealing machines 22, which are driven by a driving mechanism to move synchronously relative to or opposite to each other. A crowbar 31 is rotatably installed below both ends of the two groups of transverse heat sealing machines 22 on the frame 1. Straight grooves are provided at both ends of the crowbar 31, and plug rods are embedded in the straight grooves. The plug rods in the upper straight grooves are fixedly connected to the transverse heat sealing machines 22, and the plug rods in the lower straight grooves are fixedly connected to a horizontally movable plate 27. An expanded support bucket 29 is provided on one opposite side of the two groups of movable plates 27, and the minimum diameter of the support bucket 29 is located on the upper side of the lower end of the formed packaging film 4.

[0043] Specific: The frame 1 is a frame structure formed by welding or bolting steel, which serves as the installation and suspension foundation of the internal equipment. A plate is also fastened with bolts on the outside of the frame 1 to form the body shell, forming a semi-enclosed body. Air holes are set on the shell to facilitate ventilation and heat dissipation of the internal equipment. An observation port is set on the front side, which is made of transparent material, such as tempered glass, for observing the operating status of the internal food packaging. A control cabinet 2 is installed on the outside of the frame 1 by bolts to control the operation and opening of the equipment.

[0044] A material pipe 3 is inserted and installed on the front side of the top wall of the frame 1 (only the straight pipe part of the material pipe 3 is shown in the figure, and the bucket shape and the part connected with the feeding structure for conveying food are not shown), and the material pipe 3 is suspended.

[0045] A film roller is rotatably mounted on the rear side of the frame 1, and the film roller is used to mount the wound packaging film 4 roll. The frame 1 is provided with a film discharging mechanism 5, which is tightly buckled on the surface of the packaging film 4 roll to achieve the braking of the conveying movement of the packaging film 4. The frame 1 is provided with multiple sets of guide rollers, which are used to guide and pull the packaging film 4 toward the material pipe 3. The frame 1 is also provided with multiple sets of tensioning mechanisms, which are used to keep the packaging film 4 taut to prevent the packaging film 4 from being loose during conveying and affecting the subsequent heat sealing molding.

[0046] See attached Figure 3 , Attachment Figure 11 , Attachment Figure 12As shown in the figure, a film feeding mechanism for downwardly feeding a packaging film is provided on a frame 1. The film feeding mechanism includes two first supports 11 fixed on the frame 1, and the two first supports 11 are symmetrically arranged on the left and right sides of a material pipe 3. A first telescopic rod 12 is fixed on each of the two first supports 11, a first bracket is fixed at the output end of the first telescopic rod 12, and a belt roller 13 is rotatably installed on the first bracket at intervals in the vertical direction. A belt 14 is sleeved on the two belt rollers 13 together, and the two groups of belts 14 symmetrically abut against the packaging film 4. The rotating shaft of any one of the belt rollers 13 on both sides is connected to a connecting rod 16 through a universal joint 15-1, and the other ends of the two connecting rods 16 are connected to a gear 17 through a universal joint 15-2. The two gears 17 are rotatably installed on the frame 1, and the two gears 17 mesh with each other, and one of the gears 17 is butted against the output shaft of a reduction motor fixed on the frame 1. The reduction motor can drive the two gears 17 to rotate simultaneously, and then drive the two groups of belts 14 to roll synchronously through the universal joint 15-1, the connecting rod 16, and the universal joint 15-2, and the rolling directions are opposite. The packaging film 4 is pulled downward through extrusion friction, and then the conveying of the packaging film 4 is realized.

[0047] The first telescopic rod 12 can drive the first bracket to move horizontally to the left and right, and then drive the two groups of belts 14 to approach or move away from each other, facilitating the initial introduction and passing of the packaging film 4.

[0048] Preferably, the belt 14 is a toothed synchronous belt. This ensures the stable conveying of the belt 14 and avoids slipping, which may affect the conveying of the packaging film 4.

[0049] Preferably, the connecting rod 16 is a telescopic sleeve rod, which can be adjusted in length according to the on-site assembly dimensions.

[0050] Preferably, a plurality of groups of auxiliary film conveying mechanisms 18 are also provided at intervals on the frame 1 behind the material pipe 3 for assisting the belt 14 to guide the packaging film 4 downward. The auxiliary film conveying mechanism 18 includes an installation cylinder fixed on the frame 1, an installation rod is inserted into the installation cylinder, and an elastic member three is provided between the installation rod and the inner bottom wall of the installation cylinder. A roller that abuts against the packaging film 4 is rotatably installed at the extending end of the installation rod. Through a plurality of groups of rollers, the packaging film 4 is attached to the rear side wall of the material pipe 3, avoiding looseness and ensuring the tightness of the vertical edge butt joint heat sealing of the packaging film 4.

[0051] In the factory area, the initial state of the packaging bag is generally in the form of a thin film and is wound into a roll. Then, first, in the upper part of the material pipe 3, the two vertical edges of the packaging film 4 are closed through the vertical heat sealing mechanism 8 and then heat sealed to form a second-level cylindrical package. Then, the transverse heat sealing mechanism is used for transverse heat sealing and truncation, and the two ends of the cylindrical package are sealed, thus forming a sealed packaging bag.

[0052] In this solution, referring to Appendix Figure 3 Appendix Figure 4 Appendix Figure 5 AppendixFigure 10 As shown, the vertical heat sealing mechanism includes a film guide tube 6 fixed on the frame 1, and the film guide tube 6 is sleeved on the material tube 3. A gap is set between the inner wall of the film guide tube 6 and the outer wall of the material tube 3, and the gap is the conveying channel of the packaging film 4. The lower end of the film guide tube 6 is located above the belt 14, without contact, to prevent interference in the conveying of the packaging film 4. The side wall of the film guide tube 6 is provided with an opening 9 that penetrates from top to bottom, and the opening 9 is located on the side away from the introduction direction of the packaging film 4, that is, away from the side of the packaging film 4 roll. Film guide plates 10 are provided on both sides of the opening 9, and the vertical sides of the packaging film 4 are bent and guided to extend from the opening 9, and are buckled and closed by the film guide plates 10. The frame 1 is fixed with a second support 36 on both sides of the material tube 3, and a second telescopic rod 37 is fixed on the second support 36. The protruding ends of the second telescopic rod 37 are fixed with vertical heat sealers 8. Through the two groups of second telescopic rods 37, the two groups of vertical heat sealers 8 are controlled to approach each other for heat sealing and standby in accordance with each other. The film guide plate 10 is provided with a notch 38 used in conjunction with the vertical heat sealer 8, and the notch 38 corresponds to the width of the vertical heat sealer blade of the vertical heat sealer 8. The film guide plate 10 guides, clamps and closes the vertical edges of the packaging film 4, and the notch 38 allows the vertical heat sealer 8 to pass through the notch 38 and print on the packaging film 4 to close the vertical edges for heat sealing, so that the ends of the vertical edges are not loosened, thereby preventing the vertical edges from being dispersed when closing and heat sealing, thereby affecting the heat sealing effect.

[0053] Preferably, the spacing of the openings 9 slightly increases from the lower end surface of the notch 38 to correspond to the twisting deformation of the vertical edges of the packaging film 4 after heat sealing, so that the heat-sealed portion is not moved downwardly without being interfered by extrusion.

[0054] Preferably, see Attachment Figure 9 As shown in the figure on the right side of the middle, the horizontal cross section of the film guide plate 10 gradually closes away from the material tube 3. The spacing between the horizontal ends of the film guide plate 10 matches the thickness of the packaging film 4 after folding and laminating, so that the vertical ends of the packaging film 4 fit tightly together, ensuring the sealing of the vertical heat-sealed closure. Furthermore, a rubber pad is provided on the inner wall of the horizontal end of the film guide plate 10, and the elastic extrusion of the rubber pad makes the vertical edges of the packaging film 4 fit more tightly and the transportation more stable.

[0055] Preferably, see Attachment Figure 9 As shown, the top of the opening 9 is flared and rounded, which facilitates the closing and guiding of the vertical edges of the packaging film 4 and prevents the edges from scratching the packaging film 4 and causing packaging leakage.

[0056] Preferably, the upper end of the film guide tube 6 is provided with a shoulder 7 for spreading and guiding the packaging film 4. The shoulder 7 enlarges the contact area of ​​the packaging film 4 entering the film guide tube 6 to prevent the packaging film 4 from being excessively wrinkled after entering the film guide tube 6 and affecting the packaging aesthetics.

[0057] Preferably, the film guiding tube 6 has heat resistance and heat insulation properties. It can either be sprayed with a heat insulation coating or made of heat insulating materials such as glass fiber, asbestos, rock wool, etc., to prevent the film guiding tube 6 from being heated by the vertical heat sealer 8 and causing deformation and damage to the internal packaging film 4.

[0058] In this solution, referring to the attached Figure 4 , the attached Figure 13 , the attached Figure 14 As shown, the transverse heat sealing mechanism includes two guiding cylinders 19 fixedly installed on the frame 1. The two guiding cylinders 19 are located below the belt 14 and are symmetrically arranged left and right along the material tube 3. Two guide rods 20 are inserted and installed through the two guiding cylinders 19, and the two guide rods 20 are horizontally slidably installed back and forth in the corresponding guiding cylinders 19. Two mounting brackets 21 are jointly sleeved at one end of the two guide rods 20 close to the material tube 3. The two mounting brackets 21 are symmetrically arranged before and after along the material tube 3. Transverse heat sealers 22 are fixed on the opposite sides of the two mounting brackets 21. There are insertion holes at both ends of the two mounting brackets 21, and the guide rods 20 pass through the mounting brackets 21 from the insertion holes. One of the mounting brackets 21 is fixedly connected to the guide rod 20 through a pipe sleeve, and the other mounting bracket 21 is axially slidably engaged with the guide rod 20 through the insertion hole. In the attached figure, the front mounting bracket 21 is fixedly connected to the guide rod 20, and the rear mounting bracket 21 is horizontally slidably engaged with the guide rod 20. Connecting rods 24 are rotatably connected to both ends of the two mounting brackets 21. The two connecting rods 24 on the same side of the two mounting brackets 21 are jointly rotatably connected to a slider 25. The slider 25 is vertically slidably installed on a guide post 26. The guide post 26 is fixed on the third support, and the third support is fixed on the frame 1. Rocker arms are rotatably connected to the ends of the two guide rods 20 away from the material tube 3. Cranks (a cam structure is shown in the figure) are rotatably connected to the two rocker arms. The cranks are rotatably installed on the frame 1, forming a crank-slider mechanism 23. A double-output shaft reduction motor is fixedly installed on the frame 1. The two output shafts of the double-output shaft reduction motor are both connected to rollers rotatably installed on the frame 1 through belt drive or chain drive. Gears 17 are provided on the rotating shafts of the rollers and the cranks and are engaged with each other.

[0059] In this way, the double-output shaft reduction motor synchronously drives the crank-slider mechanism 23 to rotate, and then drives the two guide rods 20 to reciprocate horizontally back and forth in the guide cylinder 19. When the two guide rods 20 move backward, the guide rods 20 drive the front mounting bracket 21 to move backward and approach the material pipe 3. The front mounting bracket 21 presses against the slider 25 through the connecting rod 24 and moves upward along the guide post 26. The slider 25 pulls the rear mounting bracket 21 forward through another connecting rod 24 and approaches the material pipe 3. The two horizontal heat sealers 22 approach to realize the transverse heat seal of the packaging bag port. When the two move forward, the guide rods 20 drive the front mounting bracket 21 to move forward and away from the material pipe 3. The front mounting bracket 21 pulls the slider 25 downward through the connecting rod 24. The slider 25 presses against the rear mounting bracket 21 through another connecting rod 24 and moves backward and away from the material pipe 3. At this time, the two horizontal heat sealers 22 are separated and in the heat seal standby state.

[0060] Preferably, as shown in the attached Figure 13 As shown, there are multiple connection points on the crank (cam structure) that cooperate with the rocker. The multiple connection points are arranged in a straight line, that is, the distances between the multiple connection points and the rotation center of the crank gradually increase. In this way, by adjusting the different connection parts between the crank and the rocker, the amplitude of the reciprocating movement of the guide rod 20 pulled by the crank-slider mechanism 23 can be adjusted, and then the maximum distance between the two horizontal heat sealers 22 between the standby position and the heat seal position can be adjusted to adapt to different usage scenarios and improve the product scenario applicability.

[0061] In order to relieve the impact of the falling food on the heat-sealed port of the packaging bag, in this solution, on the front side of the frame 1, guide shafts 28 are symmetrically fixed left and right along the material pipe 3 below the guide rod 20. A moving plate 27 is commonly installed on both of the two guide shafts 28. The moving plate 27 has the same structure as the mounting bracket 21. The two moving plates 27 are horizontally slidably installed on the guide shafts 28. On the opposite sides of the two moving plates 27, a hopper 29 is fixed. The hopper 29 is flared. The hopper 29 has different models, and the flare angles between different models are different, corresponding to different sizes of packaging bags. The flare angle is replaced according to the size of different food packaging bags. And the minimum diameter of the hopper 29 is located above the lower port of the formed packaging film 4. The formed packaging film 4 is the state of the packaging film 4 after the vertical side is closed and heat-sealed and the lower port is transversely heat-sealed.

[0062] During feeding, the two mounting brackets 21 are separated, so that the two horizontal heat sealers 22 are separated and in the heat seal standby position. The two moving plates 27 approach, so that the minimum diameters of the hoppers 29 are mutually abutted at the upper edge of the lower seal of the formed packaging film 4. By using the clamping effect of the hopper 29 on the formed packaging film 4, the lower heat seal of the packaging bag is isolated. The food falls from the material pipe 3 and can only impact on the hopper 29, thus avoiding the possible stretching deformation of the material at the seal, misalignment of the sealing layer or even local cracking at the seal caused by the impact of the material, forming a "falling open" phenomenon, resulting in risks of air leakage, liquid leakage or microbial contamination.

[0063] After the blanking is completed, the two mounting frames 21 approach each other, causing the two horizontal heat sealers to approach each other to heat-seal the upper port of the formed packaging film 4, that is, to package and pack the complete food. The two moving plates 27 move away from each other, causing the two trays 29 to separate, so as not to interfere with the falling and conveying of the packaged food.

[0064] In order to achieve the synchronous change relationship between the positions of the horizontal heat sealer 22 and the tray 29 during the above-mentioned blanking and feeding, in this solution, trusses 30 are symmetrically and fixedly arranged on the frame 1 on the left and right sides of the material pipe 3. Two pry bars 31 are symmetrically and rotatably installed on each of the two trusses 30. The two pry bars 31 on the same truss 30 respectively correspond to the two mounting frames 21 on the guide rod 20. Straight grooves are provided at both the upper and lower ends of the pry bar 31, and insertion rods are inserted into the straight grooves. The upper insertion rod is fixedly connected to the mounting frame 21, and the lower insertion rod is fixedly connected to the moving plate 27. In this way, when the mounting frame 21 is driven to move, the two groups of moving plates 27 are synchronously driven.

[0065] When the two mounting frames 21 approach each other, causing the two horizontal heat sealers 22 to approach each other for sealing operations, the upper ends of the two pry bars 31 on the same side are pulled by the upper insertion rods to approach each other, and the lower ends move away from each other, so that the two groups of trays 29 separate, without interfering with the falling and conveying of the packaged food bags.

[0066] When the two mounting frames 21 move away from each other, causing the two horizontal heat sealers 22 to move away and be in the heat-sealing standby position, the upper ends of the two pry bars 31 on the same side separate from each other, and the lower ends approach each other, so that the two groups of trays 29 approach each other to provide impact protection for the blanking.

[0067] In this solution, clamping plates 35 are provided at the lower ends of the two groups of horizontal heat sealers 22. The two clamping plates 35 are both in a folded shape, and the bent parts of the two clamping plates 35 correspond to each other. When the two groups of horizontal heat sealers 22 approach each other for port heat-sealing, the two clamping plates 35 approach each other, and the bent parts of the two clamping plates 35 are buckled below the upper heat-sealing port of the packaging bag, so that the packaging bag does not immediately fall after the heat-sealing break. After the two horizontal heat sealers 22 separate, the two clamping plates 35 no longer clamp the packaging bag, and at this time the packaging bag falls. The packaging bag stays in the air briefly, thereby prolonging the time for the packaging bag to fall to the ground, making the heat-sealing of the packaging bag solidify better, preventing the packaging bag containing food from falling directly, and preventing the just heat-sealed port from being impacted and squeezed and bursting.

[0068] After the trays 29 separate, the packaging bag falls from the gap between the trays 29. In order to further reduce the impact after the packaging bag lands, in this solution, a guide hopper 33 is rotatably installed on the frame 1 below the moving plate 27, and the hopper is in a dustpan shape. An elastic member two 34 is provided between the guide hopper 33 and the frame 1. A pry bar 32 is rotatably installed on the frame 1 between the two groups of moving plates 27. Refer to the appendix Figure 14 AppendixFigure 17 As shown, in this solution, an extension frame is fixed on the guide shaft 28, and a pry bar 32 is rotatably mounted on the extension frame. The lower end of the pry bar 32 abuts against the side of the guide hopper 33, and the upper end of the pry bar 32 extends above the movable plate 27.

[0069] When the two movable plates 27 are close to each other, so that the supporting bucket 29 lifts and clamps the packaging bag, the movable plate 27 presses against the upper end of the pry bar 32, so that the pry bar 32 rotates counterclockwise, thereby pressing against the end of the guide hopper 33 to sink, so that there is enough space between the guide hoppers 33 to allow the lower end of the packaging bag to extend and droop downward.

[0070] When the two movable plates 27 move away from each other, the movable plate 27 is separated from the pry bar 32, and the guide hopper 33 is tilted up under the upward action of the elastic member 34, so that the guide hopper 33 is as close to the packaging bag as possible, reducing the falling height of the packaging bag, and then mitigating the impact of the packaging bag falling, reducing the probability of the seal breaking.

[0071] The specific implementation process of this plan: The packaging film 4 is pulled to the film guide tube 6, and the two vertical sides of the packaging film 4 are gathered and extended from the opening 9 and clamped between the film guide plates 10 to form a closed state. The closed packaging film 4 is clamped by two sets of adjacent vertical heat sealers 8 to achieve heat sealing. After the heat sealing is completed, the two sets of vertical heat sealers 8 are separated and moved to the standby position. The cylindrical packaging bag with the vertical edges closed and sealed continues to be pulled down by the belt 14.

[0072] When the cylindrical packaging bag moves to the horizontal heat sealer 22, the two groups of horizontal heat sealers 22 are close to achieve heat sealing of the lower end, which is the first end seal. After completing the heat sealing, the two groups of horizontal heat sealers 22 are separated to the standby position, and the packaging bag with the lower end sealed is pulled and continues to move down to the specified position. At this time, the two support buckets 29 are driven by the crowbar 31 to approach each other, and then buckle above the lower seal of the packaging bag. Then the food is injected into the packaging bag from the material pipe 3, and the food impacts the support bucket 29, thereby isolating the impact on the seal of the packaging bag and reducing the probability of the seal breaking. At this time, the movable plate 27 is against the upper end of the crowbar 32, so that the crowbar 32 sinks against the end of the guide hopper 33, so that there is enough space between the guide hopper 33 to allow the lower end of the packaging bag to extend downward and droop.

[0073] After the food is added, the two horizontal heat sealers 22 are close to heat seal the upper end, and the two support buckets 29 are separated without interfering with the falling of the packaging bag. The packaging bag after heat sealing is temporarily clamped by the clamping plate 35 and suspended in the air, thereby extending the time for the packaging bag to fall to the ground, so that the heat seal of the packaging bag is better solidified. When the two support buckets 29 are separated, the guide bucket 33 is tilted under the upward action of the elastic member 34, so that the guide bucket 33 is as close to the packaging bag as possible, reducing the falling height of the packaging bag, and then slowing down the impact of the packaging bag falling, reducing the probability of the seal breaking.

[0074] In this solution, when the two horizontal heat sealers 22 are just separated and the package starts to descend, the distance between the two hoppers 29 is sufficient for the packaging bag to pass through. Even when the two hoppers 29 move to the middle part of the stroke, the packaging bag can still slide down.

[0075] Embodiment 2: In this embodiment, in order to disconnect the upper port of the packaging bag after heat sealing, in this solution, a plurality of heat-insulating pads are fixed on the opposite sides of the two groups of mounting frames 21, and a heat-insulating tool rest 2201 is fixedly installed on the plurality of pads of the same mounting frame 21. Embedded grooves are provided on the opposite sides of the two tool rests 2201. A fixed heat seal knife 2202 is fixed in one embedded groove, and a movable heat seal knife 2203 is slidably installed in the other embedded groove. The movable heat seal knife 2203 is aligned with the fixed heat seal knife 2202 for matching use. When not disassembled, the movable heat seal knife 2203 will not fall off from the embedded groove. An elastic member 2204 is provided between the movable heat seal knife 2203 and the corresponding embedded groove. The elastic member 2204 has good heat resistance to avoid being affected by heat and affecting its elastic performance. A through hole is provided horizontally at the center of the movable heat seal knife 2203. A cutting knife 2205 is fixed in the embedded groove of the tool rest 2201 corresponding to the movable heat seal knife 2203. The cutting knife 2205 penetrates into the through hole, and a relief groove 2206 corresponding to the cutting knife 2205 is provided on the end face of the fixed heat seal knife 2202. The length of the cutting knife 2205 is less than the sum of the natural extension length of the elastic member 2204 and the thickness of the movable heat seal knife 2203, and the length of the cutting knife 2205 is greater than the depth of the embedded groove.

[0076] According to the above technical solution: When the two groups of mounting frames 21 approach each other, the movable heat seal knife 2203 and the fixed heat seal knife 2202 first come into contact with the two side faces of the packaging bag and are pressed together; at an appropriate temperature and heat seal pressure, the port of the packaging bag is melted and sealed (at this pressure, the elastic member 2204 contracts, but the cutting knife 2205 will not extend out of the through hole). Then the two horizontal heat sealers 22 continue to approach each other and apply pressure, and the elastic member 2204 is further compressed. At this time, the cutting knife 2205 extends out of the through hole into the relief groove 2206, so as to perform a transverse cut on the sealed part to separate the lower packaging bag from the upper packaging bag.

[0077] After heat sealing is completed, the two horizontal heat sealers gradually separate. At this time, the package falls onto the guide hopper 33 and falls onto a conveying mechanism such as a conveyor belt under the guidance of the guide hopper 33.

[0078] Preferably, a limiting block is provided in the embedded groove of the tool rest 2201 corresponding to the movable heat seal knife 2203 to prevent the movable heat seal knife 2203 from completely retracting into the embedded groove.

[0079] In this solution, the first telescopic rod 12 and the second telescopic rod 37 can be any one of an electric telescopic rod, a pneumatic telescopic rod, and a hydraulic telescopic rod.

[0080] In this solution, the first elastic member 2204, the second elastic member 34, and the elastic members are all springs. The springs are made of high-temperature resistant materials, such as high-temperature alloys like CrV, CrSi, Inconel, etc.

[0081] As described above, only the preferred specific embodiments of the present invention are provided, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

[0082] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0083] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A sealing machine for food packaging, comprising a frame (1) and a material tube (3), characterized in that, The frame (1) is provided with a vertical heat-sealing mechanism for sealing the vertical edges of the packaging film (4) and a horizontal heat-sealing mechanism for sealing the ends of the packaging film (4); The transverse heat sealing mechanism comprises two groups of transverse heat sealing machines (22), which are driven by a driving mechanism to move synchronously relative to or opposite to each other. A crowbar (31) is rotatably installed below the two ends of the two groups of transverse heat sealing machines (22) on the frame (1). Both ends of the crowbar (31) are provided with straight grooves, and plug rods are embedded in the straight grooves. The plug rods in the upper straight grooves are fixedly connected to the transverse heat sealing machines (22), and the plug rods in the lower straight grooves are fixedly connected to a horizontally movable plate (27). The two groups of movable plates (27) are provided with expanded support buckets (29) on opposite sides, and the minimum diameter of the support buckets (29) is located on the upper side of the lower end of the formed packaging film (4).

2. The sealing machine for food packaging according to claim 1, characterized in that, The vertical heat sealing mechanism comprises a film guiding tube (6) fixed on a frame (1), the film guiding tube (6) being sleeved on a material tube (3), a gap being set between an inner wall of the film guiding tube (6) and an outer wall of the material tube (3), an opening (9) being provided on a side of the film guiding tube (6) away from a direction in which a packaging film (4) is introduced, film guiding plates (10) for closing the vertical sides of the packaging film (4) are provided on both sides of the opening (9), and vertical heat sealing machines (8) that can be driven and moved are provided on both sides of the opening (9) on the frame (1), and a notch (38) is provided on the film guiding plate (10).

3. The sealing machine for food packaging according to claim 2, characterized in that, The horizontal cross section of the film guide plate (10) gradually closes in a direction away from the material pipe (3).

4. The sealing machine for food packaging according to claim 2, characterized in that, The upper portion of the opening (9) is in a flared shape.

5. The sealing machine for food packaging according to claim 1, characterized in that, The transverse heat sealing machine (22) comprises a symmetrically arranged mounting frame (21), the upper insertion rod being fixed to the end of the mounting frame (21), a heat-insulating knife holder (2201) being suspended on opposite sides of the two sets of mounting frames (21), and an embedding groove being provided on opposite sides of the two knife holders (2201), a fixed heat sealing knife (2202) being fixed in one embedding groove, a movable heat sealing knife (2203) matching the fixed heat sealing knife (2202) being slidably installed in the other embedding groove, an elastic member (2204) being provided between the movable heat sealing knife (2203) and the corresponding embedding groove, a clearance groove (2206) being provided on the end surface of the fixed heat sealing knife (2202), and a cutting knife (2205) penetrating the movable heat sealing knife (2203) being fixed in the embedding groove corresponding to the movable heat sealing knife (2203).

6. The sealing machine for food packaging according to claim 5, characterized in that, A guide hopper (33) is rotatably mounted on the frame (1) below the movable plate (27), a second elastic member (34) is provided between the guide hopper (33) and the frame (1), and a pry bar (32) is rotatably mounted on the frame (1) between the two sets of movable plates (27), the lower end of the pry bar (32) abuts against the side of the guide hopper (33), and the upper end of the pry bar (32) extends above the movable plate (27).

7. The sealing machine for food packaging according to claim 5, characterized in that, The driving mechanism includes two groups of guide rods (20) horizontally and slidably mounted on the frame (1). The two groups of guide rods (20) are respectively located on both sides of the mounting frame (21). Both ends of the two mounting frames (21) are respectively slidably connected to the corresponding side guide rods (20). The guide rods (20) are driven by a motor one fixed on the frame (1) through a crank-slider mechanism (23). A slider (25) is vertically and slidably mounted on the frame (1) at the midline of the two groups of horizontal heat sealers (22). Two connecting rods (24) are rotatably mounted on the slider (25). The two connecting rods (24) are respectively rotatably connected to the ends of the two groups of mounting frames (21).

8. The sealing machine for food packaging according to claim 1, characterized in that, Clamping plates (35) are provided at the lower ends of the two groups of horizontal heat sealers (22). Both of the two clamping plates (35) are in a folded shape, and the bent portions of the two clamping plates (35) correspond to each other.

9. The sealing machine for food packaging according to claim 2, characterized in that, A vest (7) for spreading and guiding the packaging film (4) is provided at the upper end of the film guiding tube (6).

10. The sealing machine for food packaging according to claim 1, characterized in that, It further includes a film feeding mechanism for feeding the packaging film (4) downward.

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