Three-edge sealing packaging machine and application thereof in jelly production

Abstract

The invention relates to the technical field of packaging machines, in particular to a three-edge sealing packaging machine and application thereof in jelly production, the three-edge sealing packaging machine comprises a control cabinet, and the control cabinet is provided with a supporting structure for loading and guiding a plastic film to move; the hot pressing device is arranged on the control cabinet, and the hot pressing device is used for conducting heat sealing on the side portion of the plastic film; the two sets of pressing and cutting assemblies are connected with the control cabinet, the pressing and cutting assemblies are used for conducting hot pressing and cutting on the ends of the plastic film, and convex shafts are rotationally installed on the pressing and cutting assemblies; the tensioning assembly is arranged in the control cabinet, and the tensioning assembly is used for tensioning and flattening the plastic film; the side frame is fixedly installed on the control cabinet, a guide structure is formed on the side frame, and the convex shaft is in rolling fit with the guide structure and can drive the two pressing and cutting assemblies to move close to or away from each other; and the elastic assembly is connected with the pressing and cutting assembly and can synchronously move along with the plastic film, and the heat sealing effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging machines, in particular to a three-side sealing packaging machine and its application in jelly production. BACKGROUND

[0002] In the jelly production process, a three-side sealing packaging machine is a commonly used packaging equipment. Its heat sealing technology can seal the three sides of the packaging bag, effectively isolating the jelly from the outside air, moisture and microorganisms, thereby significantly prolonging the shelf life of the jelly.

[0003] At present, most three-side sealing packaging machines are equipped with two sets of heat sealing components: one set is responsible for heat sealing along the length direction of the plastic film, and the other set is responsible for heat sealing along the width direction. The synergistic effect of the two sets of components realizes the complete sealing of the plastic film. However, since the heat sealing process requires a certain amount of time to ensure sealing, the existing three-side sealing packaging machines usually adopt a step-by-step traction method when pulling the plastic film.

[0004] When using step-by-step traction, in order to prevent the plastic film from being damaged due to excessive tension at the moment of traction, the rotating shaft of the film roller is usually not provided with a damping member. However, this design has obvious drawbacks: when step-by-step traction stops, the film roller will continue to rotate a certain angle due to inertia, causing the plastic film to be in a relaxed state. This relaxed state seriously affects the stability of the tension of the plastic film, and further causes the packaging film to appear loose or over-stretched during the heat sealing process, ultimately leading to the generation of folding phenomenon, seriously affecting the production quality and the sealing effect of the packaging bag. SUMMARY

[0005] The purpose of the present application is to provide a three-side sealing packaging machine and its application in jelly production to solve the problems raised in the background.

[0006] To achieve the above purpose, the present application provides the following technical solution: a three-side sealing packaging machine, comprising a control cabinet, a support structure for loading and guiding the movement of the plastic film is arranged on the control cabinet; a hot pressing device is arranged on the control cabinet, the hot pressing device is used for heat sealing the side of the plastic film; a cutting assembly is arranged in two groups connected with the control cabinet, the cutting assembly is used for heat pressing and cutting the end of the plastic film, a convex shaft is rotatably installed on the cutting assembly; a tensioning assembly is arranged in the control cabinet, the tensioning assembly is used for tensioning and flattening the plastic film; a side frame is fixedly installed on the control cabinet, a guide structure is formed on the side frame, the convex shaft and the guide structure rollingly cooperate, and can drive the two cutting assemblies to move closer to or away from each other; an elastic assembly is connected with the cutting assembly, the elastic assembly can move synchronously with the plastic film.

[0007] As a further scheme of the present application: the support structure comprises a support rod detachably connected with the control cabinet, a plurality of groups of horizontal shafts are arranged in parallel on the support rod and along the length direction of the support rod, a rotating piece is rotatably installed on the horizontal shaft at the top, and one end of the rotating piece is provided with a locking piece threadedly connected therewith; the support structure further comprises a guide piece fixedly installed on the control cabinet, and the guide piece can guide the plastic film to be folded.

[0008] As a further scheme of the present application: the tensioning assembly comprises a clamping roller set fixedly installed on the control cabinet and two groups of energy storage structures, and an obliquely arranged roller is rotatably installed at the opposite ends of the two groups of energy storage structures; the included angle between the rotation center of the obliquely arranged roller and the movement direction of the plastic film is an acute angle.

[0009] As a further scheme of the present application: the energy storage structure comprises a connecting frame connected with the control cabinet, a containing sleeve is fixedly installed on the connecting frame, a telescopic shaft is slidably installed in the containing sleeve, and an abutting ring is formed on the telescopic shaft; one end of the telescopic shaft is rotatably connected with the obliquely arranged roller, a first cylindrical spring is sleeved on the telescopic shaft, one end of the first cylindrical spring is connected with the abutting ring, and the other end of the first cylindrical spring is connected with the inner wall of the containing sleeve.

[0010] As a further scheme of the present application: the elastic assembly comprises an electric telescopic rod fixedly installed on the side frame, a lifting piece is connected to the action end of the electric telescopic rod, grooves are formed at the two ends of the lifting piece, and the grooves are slidably connected with guide portions arranged on the side frame; a connecting shaft capable of being inserted into the cutting and pressing assembly is arranged on the lifting piece, a second cylindrical spring is sleeved on the connecting shaft, one end of the second cylindrical spring is connected with the lifting piece, and the other end of the second cylindrical spring is connected with the cutting and pressing assembly.

[0011] As a further scheme of the present application: the guide structure comprises a first vertical groove formed in the inner side of the side frame, a third vertical groove and a first inclined groove are connected with the lower end of the first vertical groove, one end of the first inclined groove away from the first vertical groove is connected with a second vertical groove parallel to the third vertical groove, and the second vertical groove and the third vertical groove are connected through a second inclined groove; the guide structure further comprises a deflection piece rotatably installed at one end of the first inclined groove facing the first vertical groove, and a torsional spring is connected to the rotation shaft of the deflection piece.

[0012] As a further scheme of the present application: the cutting assembly comprises a cutter in sliding connection with the connecting shaft, and the two sides of the cutter are rotatably installed with the convex shafts; the cutting assembly further comprises heat pressing plates symmetrically arranged on the upper and lower sides of the cutter, and the heat pressing plates are fixedly installed with connecting rods in sliding connection with the cutter, the connecting rods are sleeved with third columnar springs, one end of the third columnar spring is connected with the heat pressing plate, and the other end is connected with the cutter.

[0013] As a further scheme of the present application: the heat pressing plate protrudes from the side of the cutter away from the lifting member.

[0014] Application of the three-side sealing packaging machine in jelly production.

[0015] Compared with the prior art, the present application has the beneficial effects that: through the arrangement of the side frame, the elastic assembly and the cutting assembly, the cutter and the heat pressing plate can move close to each other when the elastic assembly moves synchronously with the plastic film, so that the plastic film does not need to be pulled by the step during the heat sealing and cutting process, on the one hand, avoiding the relaxation of the plastic film caused by the step pulling, ensuring that the plastic film can always have a certain tension, improving the heat sealing effect to a certain extent, reducing the occurrence of longitudinal folding during heat sealing, improving the sealing effect, on the other hand, improving the production speed; through the arrangement of the tensioning assembly, the cross section of the plastic film can form a structure similar to a straight line, so that the plastic film can be better heat sealed along its width when the heat pressing plate acts on the plastic film, to a certain extent, avoiding the above-mentioned phenomenon of transverse overlap during the heat sealing process, improving the heat sealing effect. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of an embodiment of the three-side sealing packaging machine; Figure 2 It is a structural schematic view of another angle of an embodiment of the three-side sealing packaging machine; Figure 3 It is a structural schematic view of the tensioning assembly of an embodiment of the three-side sealing packaging machine; Figure 4 It is an exploded view of the energy storage structure of an embodiment of the three-side sealing packaging machine; Figure 5 It is a force schematic view of the obliquely arranged roller of an embodiment of the three-side sealing packaging machine; Figure 6 It is a structural schematic view of the support structure of an embodiment of the three-side sealing packaging machine; Figure 7 It is a structural schematic view of the two groups of side frames and the elastic assembly of an embodiment of the three-side sealing packaging machine; Figure 8Figure 1 is a structural diagram of one of the side frames and the elastic assembly in one embodiment of the three-side sealing packaging machine; Figure 9 Figure 2 is a structural diagram of the elastic assembly and the cutting assembly in one embodiment of the three-side sealing packaging machine; Figure 10 Figure 3 is a structural diagram of the guide structure in one embodiment of the three-side sealing packaging machine.

[0017] In the figure: 1, control cabinet; 2, support rod; 3, horizontal shaft; 4, rotating piece; 5, locking piece; 6, guide piece; 7, clamping roller set; 8, hot pressing device; 9, connecting frame; 10, accommodating sleeve; 1001, limiting block; 11, first cylindrical spring; 12, telescopic shaft; 1201, abutting ring; 1202, limiting groove; 13, obliquely arranged roller; 14, side frame; 1401, first vertical groove; 1402, first inclined groove; 1403, second vertical groove; 1404, second inclined groove; 1405, third vertical groove; 1406, guide part; 15, electric telescopic rod; 16, deflection piece; 17, lifting piece; 1701, groove; 18, connecting shaft; 19, second cylindrical spring; 20, cutter; 21, connecting rod; 22, third cylindrical spring; 23, hot pressing plate; 24, protruding shaft. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0019] In addition, in the present application, an element is referred to as "fixed to" or "disposed on" another element, which can be directly on another element or can have a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or can have a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0020] Please refer to Figures 1-10 In the embodiments of the present application, the three-side sealing packaging machine comprises a control cabinet 1, a hot pressing device 8, a cutting assembly, a tensioning assembly, a side frame 14 and an elastic assembly.

[0021] The control cabinet 1 is provided with a support structure for loading and guiding the plastic film movement, which comprises a support rod 2 detachably connected with the control cabinet 1. The detachable connection mode includes, but is not limited to, bolt and nut, buckle and the like, so as to facilitate the disassembly of the support rod 2. A plurality of groups of horizontal shafts 3 are fixedly installed on the support rod 2 in parallel and along the length direction of the support rod 2. A rotating piece 4 is rotatably installed on the horizontal shaft 3 at the top. One end of the rotating piece 4 is provided with a locking piece 5 threadedly connected therewith. The support structure further comprises a guide piece 6 fixedly installed on the control cabinet 1, which can guide the plastic film to be folded.

[0022] Before the edge sealing operation, the locking piece 5 is removed, and then the film roll wound with the plastic film is sleeved on the rotating piece 4, and then the locking piece 5 is reinstalled on the rotating piece 4. At this time, the two sides of the film roll can be abutted by the rotating piece 4 and the locking piece 5, so as to realize the clamping of the film roll, and ensure that the film roll has high stability when the plastic film on the film roll is pulled during the edge sealing operation. Compared with the prior art in which the film roll is directly placed on the horizontal shaft 3, the embodiment effectively prevents the film roll from sliding in the axial direction of the horizontal shaft 3, thereby preventing the film roll from slipping off the horizontal shaft 3 support, and ensuring the smooth progress of the edge sealing operation.

[0023] When the plastic film on the film roll is completely used up, the film roll can be replaced by disassembling the locking piece 5, so that the film roll has more convenient replaceability.

[0024] Further, under the action of the guide piece 6, the plastic film can be guided to be folded when passing through the guide piece 6, so that the plastic film can be folded along its length direction, so that the two ends in the length direction can overlap together. When the heat pressing device 8 acts on the two overlapping ends, the two overlapping ends can be heat sealed, so that the plastic film can form a cylindrical structure, and ensure that the plastic film can form a closed chamber inside when the subsequent cutting assembly acts.

[0025] Please refer to Figures 8-9The heat pressing device 8 is arranged on the control cabinet 1, and is used for heat sealing the side of the plastic film. Two groups of heat sealing rollers are arranged on the heat pressing device 8, and the two groups of heat sealing rollers can cooperate to complete heat sealing while rolling the plastic film. The cutting and pressing assembly is arranged in two groups and connected with the control cabinet 1. The cutting and pressing assembly is used for heat pressing and cutting the end of the plastic film. The cutting and pressing assembly is rotatably provided with a convex shaft 24. The cutting and pressing assembly comprises a cutter 20 which is slidably connected with the connecting shaft 18. The cutter 20 is rotatably provided with the convex shaft 24 on both sides. The cutting and pressing assembly further comprises heat pressing plates 23 which are symmetrically arranged on the upper and lower sides of the cutter 20. The heat pressing plates 23 are fixedly provided with a connecting rod 21 which is slidably connected with the cutter 20. The connecting rod 21 is sleeved with a third column spring 22. One end of the third column spring 22 is connected with the heat pressing plate 23, and the other end is connected with the cutter 20. Specifically, one side of the heat pressing plate 23 away from the third column spring 22 protrudes from one side of the cutter 20 away from the lifting piece 17.

[0026] In use, the elastic assembly moves synchronously with the plastic film. When the elastic assembly moves, the two groups of cutting and pressing assemblies can move close to each other. Specifically, in the initial state, the third column spring 22 is in a natural state. When the two groups of cutting and pressing assemblies move close to each other, the cutter 20 can drive the heat pressing plate 23 to move through the support of the third column spring 22. One side of the heat pressing plate 23 away from the third column spring 22 protrudes from one side of the cutter 20 away from the lifting piece 17. Therefore, when the two groups of cutters 20 and the two groups of heat pressing plates 23 move close to each other, the two groups of heat pressing plates 23 can first adhere to the plastic film, and the plastic film is heat pressed along the width direction to form an integrated structure. Then, in the process of the cutters 20 continuing to move close to each other, the two groups of cutters 20 can cooperate to cut the plastic film, so as to realize the sub-packaging of the plastic film to the material, and facilitate subsequent storage and transportation.

[0027] The two groups of heat pressing plates 23 are arranged on the upper and lower sides of the cutter 20. Therefore, when the two groups of cutters 20 move close to each other, the two groups of heat pressing plates 23 on the upper and lower sides can heat seal the plastic film on both sides of the cutter 20. In this way, when the cutter 20 cuts the plastic film, the independent plastic film separated from the plastic film forms a sealed structure, and the upper plastic film is heat pressed at the bottom to form an integrated structure, so as to prevent the situation that the heat sealing number of the plastic film is insufficient due to the action of a group of heat pressing plates 23 on the plastic film.

[0028] Please refer to Figures 1-5The tensioning assembly is arranged in the control cabinet 1, and is used for tensioning and flattening the plastic film; the tensioning assembly comprises a clamping roller set 7 fixedly installed on the control cabinet 1 and two groups of energy storage structures, and opposite ends of the two groups of energy storage structures are rotatably installed with inclined roller wheels 13; the energy storage structure comprises a connecting frame 9 connected with the control cabinet 1, the connecting frame 9 is fixedly installed with a containing sleeve 10, a telescopic shaft 12 is slidably installed in the containing sleeve 10, and an abutting ring 1201 is formed on the telescopic shaft 12; one end of the telescopic shaft 12 is rotatably connected with the inclined roller wheel 13, a first cylindrical spring 11 is sleeved on the telescopic shaft 12, one end of the first cylindrical spring 11 is connected with the abutting ring 1201, and the other end is connected with the inner wall of the containing sleeve 10; wherein the telescopic shaft 12 is provided with a limiting groove 1202 along the length direction, the limiting groove 1202 is slidably connected with a limiting block 1001 arranged in the containing sleeve 10, so that the axial rotation between the telescopic shaft 12 and the containing sleeve 10 is avoided, and the stability of the axial direction of the inclined roller wheel 13 is ensured; wherein the included angle between the rotation center of the inclined roller wheel 13 and the movement direction of the plastic film is an acute angle.

[0029] In the prior art, after the plastic film is guided by the guide 6 and heat-sealed along the length direction, the cross section of the plastic film is in a cylindrical or water-drop shape. Since the temperature on the hot plate 23 is high, when the hot plate 23 acts on the plastic film, the remaining part of the plastic film needs to be further deformed to make the plastic film adhere after the local part of the plastic film adheres to the hot plate 23. In this process, when the deformation of the plastic film is inconsistent, the hot-sealed mouth of the plastic film is folded when the hot plate 23 acts on the plastic film, which affects the product quality. Therefore, in the embodiment, after the plastic film is guided and folded by the guide 6, the folded end is clamped between the clamping roller set 7, and the two groups of inclined roller wheels 13 abut the area close to the folded area of the plastic film, so that the area close to the folded area of the plastic film can be bent to a certain extent without forming a fold. At this time, the cross section of the plastic film can form a structure close to a straight line, so that the plastic film can be better heat-sealed along the width when the hot plate 23 acts on the plastic film, and the transverse overlapping phenomenon in the heat-sealing process is avoided to a certain extent, and the heat-sealing effect is improved.

[0030] It should be noted that the inclined roller wheel 13 will produce sliding friction with the plastic film during the movement of the plastic film, and the inclined roller wheel 13 is provided with a lubricating oil hole 1301. Figure 5Due to the sliding friction between the inclined roller 13 and the plastic film, a friction force F1 is generated. The friction force F1 causes the inclined roller 13 to generate component forces F2 and F3 on the plastic film. Among them, the component force F2 can make the plastic film stretched along its width direction, and the component force F3 can make the plastic film stretched along its length direction. At this time, the entire plastic film can show a tendency to be stretched. When the hot pressing device 8 acts on the end of the plastic film, the heat seal of the end can be made more neat, which can avoid the phenomenon of folding or slight misalignment of the heat seal at the end caused by the relaxation of the plastic film to a certain extent, thereby improving the heat sealing effect.

[0031] See also Figure 8 、 Figure 10 , the side frame 14 is fixedly mounted on the control cabinet 1, and a guide structure is formed on the side frame 14, and the convex shaft 24 rolls with the guide structure to drive the two groups of cutting components to move closer to or away from each other; the guide structure includes a first vertical slot 1401 opened on the inner side of the side frame 14, and the lower end of the first vertical slot 1401 is connected to the third vertical slot 1405 and the first inclined slot 1402, and the end of the first inclined slot 1402 away from the first vertical slot 1401 is connected to the second vertical slot 1403 parallel to the third vertical slot 1405, and the second vertical slot 1403 and the third vertical slot 1405 are connected by a second inclined slot 1404; the guide structure also includes a deflection member 16 rotatably mounted on one end of the first inclined slot 1402 toward the first vertical slot 1401, and a torsion spring is connected to the rotating shaft of the deflection member 16.

[0032] In the initial state, the convex shaft 24 is located at one end of the first vertical groove 1401 away from the third vertical groove 1405, and the elastic assembly moves synchronously with the plastic film, so that when the plastic film moves, the elastic assembly can drive the cutter 20 and the hot plate 23 to move downward synchronously, at this time the convex shaft 24 will move along the first vertical groove 1401, and when the convex shaft 24 moves to the end of the first vertical groove 1401, the convex shaft 24 will abut against the deflector 16 and enter the first inclined groove 1402 under the guidance of the deflector 16. In this process, the cutter 20 and the hot plate 23 can not only move downward synchronously with the plastic film, but also move closer to each other, thereby completing the heat sealing and cutting of the plastic film. When the convex shaft 24 moves into the second vertical groove 1403, the hot plate 23 can continue to act on the plastic film after cutting to stabilize the heat sealing of the plastic film. When the convex shaft 24 moves into the second inclined groove 1404 from the second vertical groove 1403, the convex shaft 24 can move reversely in cooperation with the second inclined groove 1404, so that the cutter 20 and the hot plate 23 move away from each other to separate from the plastic film. Then the elastic assembly moves upward, so that the convex shaft 24 moves along the third vertical groove 1405, and when the convex shaft 24 abuts against the deflector 16 again, the deflector 16 deflects. At this time, the convex shaft 24 can reset into the first vertical groove 1401, and the deflector 16 can also reset to the initial state under the action of the torsional spring.

[0033] In the process of continuous production, after the convex shaft 24 resets, the elastic assembly can continue to act, thereby repeating the above process to realize the heat sealing and cutting of the plastic film.

[0034] Based on the above arrangement, since the elastic assembly can move synchronously with the plastic film, and in the process of synchronous movement, the cutter 20 and the hot plate 23 can move closer to each other, so that the plastic film does not need to be pulled by stepping during heat sealing and cutting. On the one hand, it avoids the relaxation of the plastic film caused by the stepping pulling of the plastic film, ensures that the plastic film can always have a certain tension, to some extent improves the heat sealing effect, reduces the occurrence of longitudinal folding during heat sealing, improves the sealing effect, and on the other hand improves the production speed.

[0035] Please refer to Figures 8-9 , the elastic assembly is connected with the cutting assembly, the elastic assembly can move synchronously with the plastic film, the elastic assembly comprises an electric telescopic rod 15 fixedly installed on the side frame 14, the action end of the electric telescopic rod 15 is connected with a lifting piece 17, recesses 1701 are formed at both ends of the lifting piece 17, and the recesses 1701 are slidably connected with guide portions 1406 arranged on the side frame 14; further, the action end of the electric telescopic rod 15 moves downward at the same speed as the pulling speed of the plastic film, and the electric telescopic rod 15 can also be a pneumatic cylinder or a hydraulic cylinder.

[0036] The lifting piece 17 is provided with a connecting shaft 18 capable of being inserted into the cutting and pressing assembly, a second cylindrical spring 19 is sleeved on the connecting shaft 18, one end of the second cylindrical spring 19 is connected with the lifting piece 17, and the other end is connected with the cutting and pressing assembly.

[0037] In the present application, when the convex shaft 24 moves in the second inclined groove 1404, the cooperation of the two can make the convex shaft 24 move to the end of the second inclined groove 1404 close to the third vertical groove 1405, but the stability of this movement is difficult to guarantee, that is, when the convex shaft 24 moves slightly, it may not enter into the third vertical groove 1405 when rising, and in the present embodiment, by arranging the second cylindrical spring 19 (which is initially to be stretched), when the convex shaft 24 moves towards the first inclined groove 1402, the second cylindrical spring 19 can be pulled to store elastic potential energy, and when the convex shaft 24 moves in the second inclined groove 1404, the second cylindrical spring 19 can actively pull the convex shaft 24 back by releasing the elastic potential energy, thereby driving the cutting knife 20 and the hot pressing plate 23 to reset, improving the stability in the resetting process, and to some extent, reducing the abutting force borne by the convex shaft 24 when cooperating with the second inclined groove 1404.

[0038] Further, since the second inclined groove 1404 is arranged to be inclined, when the convex shaft 24 moves laterally, it can be in a predetermined proportion to the movement speed in the vertical direction, so as to avoid the convex shaft 24 from colliding and vibrating due to the instantaneous rebound under the pulling of the second cylindrical spring 19, which on the one hand can prevent the convex shaft 24 from rebounding due to the impact and failing to smoothly enter into the third vertical groove 1405, and on the other hand can avoid the connection stability of the hot pressing plate 23 and the cutting knife 20 from being reduced due to frequent vibration.

[0039] As an embodiment of the present application, the application of the three-edge sealing packaging machine in the production of jelly is also proposed.

[0040] It is obvious for those skilled in the art that the present application is not limited to the details of the above-mentioned exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting in any aspect, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0041] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A three-side sealing packaging machine, comprising a control cabinet, on which is provided a support structure for loading and guiding the movement of the plastic film; a hot pressing device, provided on the control cabinet, for heat-sealing the sides of the plastic film; a pressing and cutting assembly, provided with two groups connected to the control cabinet, for hot-pressing and cutting the ends of the plastic film, with a convex shaft rotatably mounted on the pressing and cutting assembly; characterized in that: Also includes: A tensioning assembly is arranged in the control cabinet, and is used to tension and flatten the plastic film; a side frame is fixedly mounted on the control cabinet, and a guide structure is formed on the side frame. The convex shaft and the guide structure are in rolling cooperation, and can drive the two groups of pressing and cutting assemblies to move closer to or away from each other; an elastic assembly is connected to the pressing and cutting assembly, and the elastic assembly can move synchronously with the plastic film.

2. The three-side sealing packaging machine according to claim 1, characterized in that: The support structure includes a support rod detachably connected to the control cabinet, and the support rod is provided with multiple groups of parallel horizontal axes arranged along the length direction of the support rod. A rotating part is rotatably installed on the horizontal axis at the top, and one end of the rotating part is provided with a locking part threadedly connected to it; the support structure also includes a guide part fixedly installed on the control cabinet, and the guide part can guide the plastic film to fold.

3. The three-side sealing packaging machine according to claim 1, characterized in that: The tensioning assembly includes a clamping roller group fixedly mounted on the control cabinet and two energy storage structures, wherein inclined rollers are rotatably mounted on opposite ends of the two energy storage structures; the angle between the rotation center of the inclined rollers and the movement direction of the plastic film is an acute angle.

4. The three-side sealing packaging machine according to claim 3, characterized in that: The energy storage structure includes a connecting frame connected to the control cabinet, a receiving sleeve is fixedly installed on the connecting frame, a telescopic shaft is slidably installed in the receiving sleeve, and an abutment ring is formed on the telescopic shaft; one end of the telescopic shaft is rotatably connected to the inclined roller, and a first cylindrical spring is sleeved on the telescopic shaft, one end of the first cylindrical spring is connected to the abutment ring, and the other end is connected to the inner wall of the receiving sleeve.

5. The three-side sealing packaging machine according to claim 1, characterized in that: The elastic component includes an electric telescopic rod fixedly mounted on the side frame, a lifting member is connected to the action end of the electric telescopic rod, grooves are provided at both ends of the lifting member, and the grooves are slidably connected to the guide parts provided on the side frame; the lifting member is provided with a connecting shaft that can be inserted into the pressing and cutting assembly, and a second cylindrical spring is sleeved on the connecting shaft, one end of the second cylindrical spring is connected to the lifting member, and the other end is connected to the pressing and cutting assembly.

6. The three-side sealing packaging machine according to claim 1, characterized in that: The guide structure includes a first vertical slot opened on the inner side of the side frame, the lower end of the first vertical slot is connected to the third vertical slot and the first inclined slot, the end of the first inclined slot away from the first vertical slot is connected to the second vertical slot parallel to the third vertical slot, and the second vertical slot and the third vertical slot are connected by the second inclined slot; the guide structure also includes a deflection member rotatably installed in the first inclined slot at one end facing the first vertical slot, and a torsion spring is connected to the rotating shaft of the deflection member.

7. The three-side sealing packaging machine according to claim 5, characterized in that: The pressing and cutting assembly includes a cutter slidably connected to the connecting shaft, and the convex shafts are rotatably installed on both sides of the cutter; the pressing and cutting assembly also includes a hot pressing plate symmetrically arranged on the upper and lower sides of the cutter, and a connecting rod slidably connected to the cutter is fixedly installed on the hot pressing plate, and a third cylindrical spring is sleeved on the connecting rod, one end of the third cylindrical spring is connected to the hot pressing plate, and the other end is connected to the cutter.

8. The three-side sealing packaging machine according to claim 7, characterized in that: The side of the hot pressing plate away from the third cylindrical spring protrudes from the side of the cutter away from the lifting member.

9. Use of the three-side sealing packaging machine according to any one of claims 1 to 8 in jelly production.

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