Aluminum film wrapping mechanism of lunch box sealing machine

Abstract

An aluminum film wrapping mechanism of a meal box sealing machine is characterized by comprising a supporting frame, a connecting rod base, a plurality of connecting rods, a plurality of sliding blocks and a plurality of aluminum film edge folding components, and a connecting rod base lifting mechanism capable of driving the connecting rod base to ascend and descend is arranged on the supporting frame; a mounting bottom plate is arranged on the supporting frame, a plurality of guide grooves extending from outside to inside are formed in the mounting bottom plate, the guide grooves and the sliding blocks are the same in number and are in one-to-one correspondence, the sliding blocks are mounted in the guide grooves and can slide along the guide grooves, and the sliding blocks and the aluminum film edge folding components are the same in number and are in one-to-one correspondence; the aluminum film edge folding parts are positioned below the mounting bottom plate and are connected with the corresponding sliding blocks; the sliding blocks are hinged to the first ends of the corresponding connecting rods, and the second ends of the connecting rods are hinged to the connecting rod base. The edge part of the aluminum film can be automatically folded, so that the aluminum film wraps an opening in the top of a meal box, the automation degree is high, and the production efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to a packaging machine, in particular to an aluminum film wrapping mechanism of a lunch box sealing machine. Background Art

[0002] Pre-prepared meals and dishes are now widely used due to their convenience, such as the meals provided to passengers on civil aircraft during the flight. Pre-prepared meals and dishes usually need to be heated before consumption, so their packaging should meet the actual need of being able to heat the food quickly.

[0003] At present, most lunch boxes are aluminum foil boxes. After putting the food in the lunch box, the opening on the top of the lunch box is wrapped with aluminum film, and it can be heated before eating. The aluminum foil box material and the aluminum film are both thin, and the thickness of the aluminum film is usually smaller than that of the aluminum foil box material. After the aluminum film wraps the opening on the top of the lunch box, a small gap is usually left between the aluminum film and the outer edge of the opening to allow heat to be dissipated during the heating process.

[0004] During the production process, the opening at the top of the lunch box needs to be wrapped with aluminum film to package the food. In the prior art, the aluminum film is mostly wrapped manually, which is inefficient and difficult to ensure product quality and hygiene. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an aluminum film wrapping mechanism for a lunch box sealing machine, which can automatically fold the edge of the aluminum film so that the aluminum film wraps the opening at the top of the lunch box. The technical solution adopted is as follows:

[0006] A kind of aluminum film wrapping mechanism of lunch box sealing machine is characterized by comprising a support frame, a connecting rod seat, multiple connecting rods, multiple sliders and multiple aluminum film edge folding parts, the support frame is provided with a connecting rod seat lifting mechanism capable of driving the connecting rod seat to lift and lower; the support frame is provided with a mounting base plate, the mounting base plate is provided with a plurality of guide grooves extending from outside to inside, the number of the guide grooves is the same as that of the sliders and they correspond one to one, the sliders are installed in the guide grooves and can slide along the guide grooves, the number of the sliders is the same as that of the aluminum film edge folding parts and they correspond one to one, the aluminum film edge folding parts are located below the mounting base plate and connected to the corresponding sliders; the number of the sliders is the same as that of the connecting rods and they correspond one to one, the sliders are hinged to the first ends of the corresponding connecting rods, and the second ends of the respective connecting rods are hinged to the connecting rod seats.

[0007] The guide groove extends from outside to inside, which means that the guide groove extends from the edge of the installation base plate to the center of the installation base plate.

[0008] Usually, the connecting rod seat is located above the mounting base plate. Preferably, the connecting rod seat is located directly above the center of the mounting base plate.

[0009] Usually, the outer side of the opening at the top of the lunch box has an outer flange. The lunch box is transported by a conveying device, and an aluminum film is first covered on the opening at the top of the lunch box by a film suction and release mechanism, and then transported by the conveying device to an aluminum film wrapping mechanism, which wraps the opening at the top of the lunch box with aluminum film.

[0010] Typically, the aluminum film wrapping mechanism of the lunch box sealing machine further includes a frame and a support frame lifting mechanism capable of driving the support frame to rise and fall, and the support frame lifting mechanism is mounted on the frame. In a preferred embodiment, the support frame lifting mechanism includes a support frame lifting cylinder, which is mounted on the frame, and the piston rod of the support frame lifting cylinder faces downward and is connected to the support frame. The support frame lifting mechanism can also use an electric motor as a power source, and drive the support frame to rise and fall through a transmission mechanism (such as a cam mechanism, a connecting rod mechanism, or a screw / nut structure).

[0011] When the above-mentioned aluminum film wrapping mechanism is in the initial state, the inner edges of the folding components of the aluminum film edges form a folding space that is slightly larger than the outer edge of the outer flange of the lunch box; when the lunch box covered with aluminum film reaches the aluminum film wrapping mechanism, a box supporting mechanism can lift the lunch box so that the outer flange of the lunch box is higher than the conveying device; then the aluminum film and the opening at the top of the lunch box enter the above-mentioned folding space (when a support frame lifting mechanism is provided, the support frame can be driven to descend by the support frame lifting mechanism; when no support frame lifting mechanism is provided, the lunch box can be further lifted by the box supporting mechanism), at this time, the edge portion of the aluminum film is bent downward under the obstruction of the inner edges of the folding components of the aluminum film edges; then the connecting rod seat lifting mechanism drives the connecting rod seat to rise, and the second ends of the connecting rods rise accordingly, and the first ends of the connecting rods drive the slide blocks to move inward along the guide grooves, at this time, the edge portions of the aluminum film are pushed inwardly along the moving inwards of the folding components of the aluminum film, so that the edge portions of the aluminum film are overlapped on the lower side of the outer flange of the lunch box, thereby realizing the wrapping of the top opening of the lunch box by the aluminum film.

[0012] Generally, the number of aluminum film edge folding parts is determined according to the shape and size of the top opening of the lunch box. For example, when the top opening of the lunch box is a quadrilateral, four aluminum film edge folding parts are provided; when the top opening of the lunch box is a hexagon, six aluminum film edge folding parts are provided. In the case where the top opening of the lunch box is larger, the number of aluminum film edge folding parts can be increased. In the case where the top opening of the lunch box is a polygon, each aluminum film edge folding part can correspond to each corner of the top opening of the lunch box, or can correspond to each side of the top opening of the lunch box.

[0013] In the preferred embodiment, a positioning groove capable of accommodating the top of the lunch box is provided on the lower surface of the central part of the above-mentioned installation bottom plate, and each aluminum film edge folding component is located around the positioning groove. When the aluminum film and the opening of the top of the lunch box enter the above-mentioned film folding space (the film folding space is directly below the positioning groove), the edge of the aluminum film is bent downward under the obstruction of the inner edge of each aluminum film edge folding component, and at the same time, the top of the lunch box is located in the positioning groove, so that the lunch box is positioned, which can prevent the lunch box from being misplaced during the subsequent further film folding operation.

[0014] Usually, the bottom of the guide groove supports the slider, providing support for the slider and the folding part of the aluminum film edge.

[0015] In the preferred embodiment, the top of the guide groove is provided with a top opening, and the bottom of the guide groove supports the slider; a slider limiting mechanism is provided on the upper surface of the mounting base plate at a position corresponding to each guide groove; the slider limiting mechanism includes a strip-shaped limiting block, which is located on the upper side of the guide groove and spans the guide groove. The strip-shaped limiting block blocks the corresponding part of the top opening of the guide groove, and can prevent the slider from detaching from the top opening of the guide groove. Usually, the strip-shaped limiting block is located on the upper side of the middle part of the guide groove.

[0016] In a more preferred embodiment, the slider limit mechanism further includes two compression springs and two guide posts, the two guide posts are respectively located on both sides of the guide groove, the strip limit block is provided with two guide holes, the two guide holes are respectively located at both ends of the strip limit block, the two guide posts are respectively located in the two guide holes, the two compression springs are respectively sleeved on the two guide posts, a spring limit block is provided on the top of the guide post, and the lower end and the upper end of the compression spring are respectively in close contact with the strip limit block and the spring limit block. The two compression springs exert a downward force on the strip limit block, so that the lower surface of the strip limit block can contact the upper surface of the slider, or block the corresponding part of the top opening of the guide groove. In addition, the two compression springs also play a buffering role.

[0017] In a further preferred embodiment, there is a gap between the upper surface of the aluminum film edge folding component and the lower surface of the mounting base plate; the inner end of the guide groove has a slider limiting inner wall. In the initial state, the slider is located near the outer end of the guide groove, and the bottom of the guide groove supports the slider. At this time, there is a gap between the upper surface of the aluminum film edge folding component and the lower surface of the mounting base plate; in the process of folding the aluminum film edge inward, the slider will not shift upward due to the downward pressure of the strip limiting block, and the slider and the aluminum film edge folding component move inward along the guide groove; when the inner end of the slider contacts the slider limiting inner wall at the inner end of the guide groove, the slider cannot continue to move inward, and at this time, the connecting rod seat lifting mechanism drives the connecting rod seat to continue to rise, and the first end of each connecting rod drives each slider to rise (at this time, the slider pushes the strip limiting block upward, and the two compression springs are compressed), and each aluminum film edge folding component also rises, and presses the edge portion of the aluminum film superimposed on the lower side of the outer flange of the lunch box upward, so that it is close to the lower side of the outer flange of the lunch box, so that the aluminum film wraps the top opening of the lunch box more firmly. Preferably, an aluminum film pressing convex edge is provided on the inner edge of the upper surface of the aluminum film edge folding component. When the aluminum film edge folding component rises, the aluminum film pressing convex edge presses the aluminum film upward to overlap the edge portion of the lower side of the outer flange of the lunch box.

[0018] In a preferred embodiment, the slider is a strip slider, the outer end of the strip slider is connected to the outer edge of the corresponding aluminum film edge folding component through a connecting column, the inner end of the strip slider is hinged to the first end of the corresponding connecting rod, and the bottom of the guide groove is provided with a strip guide through hole for the connecting column to pass through. The connecting column is in the strip guide through hole, and when the strip slider moves along the guide groove, the connecting column moves along the strip guide through hole.

[0019] In a more preferred embodiment, the outer end of the guide groove has a first outer end opening, and the outer end of the strip guide through hole has a second outer end opening. In this case, during assembly, the strip slider can be inserted into the guide groove through the first outer end opening of the guide groove, and the connecting column can be inserted into the strip guide through hole through the second outer end opening of the strip guide through hole, which is more convenient for assembly. When the strip slider moves outward along the guide groove, the outer end of the strip slider can extend from the first outer end opening of the guide groove, and a part of the connecting column can also extend from the second outer end opening of the strip guide through hole.

[0020] In a preferred embodiment, the support frame is provided with at least one guide column extending up and down, the connecting rod seat is provided with at least one guide sleeve, the number of guide sleeves is the same as that of guide columns and they correspond one to one, the guide sleeve is sleeved on the guide column and can be lifted and lowered along the guide column.

[0021] In a preferred embodiment, the connecting rod seat lifting mechanism comprises a connecting rod seat lifting cylinder, which is mounted on a support frame, and a piston rod of the connecting rod seat lifting cylinder faces downward and is connected to the connecting rod seat. The connecting rod seat lifting mechanism can also use an electric motor as a power source, and drive the connecting rod seat to rise and fall through a transmission mechanism (such as a cam mechanism, a connecting rod mechanism, or a screw / nut structure).

[0022] The utility model can automatically fold the edge of the aluminum film so that the aluminum film wraps the opening at the top of the lunch box, has a high degree of automation, and is beneficial to improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the utility model;

[0024] Figure 2 It is a structural schematic diagram of a preferred embodiment of the utility model (initial state; the support frame lifting mechanism is not drawn);

[0025] Figure 3 yes Figure 2 AA section view;

[0026] Figure 4 yes Figure 2 BB cross-sectional view;

[0027] Figure 5 yes Figure 2 CC section view;

[0028] Figure 6 yes Figure 2 A perspective view of the structure shown (looking from bottom to top);

[0029] Figure 7 It is a structural schematic diagram of a preferred embodiment of the utility model (first working state; the support frame lifting mechanism is not drawn);

[0030] Figure 8 yes Figure 7 DD cross-sectional view;

[0031] Fig. 9 It is a structural schematic diagram of a preferred embodiment of the utility model (second working state; the support frame lifting mechanism is not drawn);

[0032] Fig.10 yes Fig. 9 EE cross-sectional view;

[0033] Fig.11 yes Fig. 9 FF cross-sectional view;

[0034] Fig.12 yes Fig. 9 A perspective view of the structure shown. DETAILED DESCRIPTION

[0035] like Figure 1-Figure 6 As shown, the aluminum film wrapping mechanism of the lunch box sealing machine includes a frame 1, a support frame 2, a connecting rod seat 3, a plurality of connecting rods 4, a plurality of sliders 5 and a plurality of aluminum film edge folding parts 6. The support frame 2 is provided with a connecting rod seat lifting mechanism capable of driving the connecting rod seat 3 to rise and fall; the support frame 2 is provided with a mounting base plate 7, and the mounting base plate 7 is provided with a plurality of guide grooves 8 extending from the outside to the inside, the number of the guide grooves 8 is the same as that of the sliders 5 and they correspond one to one, the sliders 5 are installed in the guide grooves 8 and can slide along the guide grooves 8, the number of the sliders 5 is the same as that of the aluminum film edge folding parts 6 and they correspond one to one, the aluminum film edge folding parts 6 are located below the mounting base plate 7 and connected to the corresponding sliders 5; the number of the sliders 5 is the same as that of the connecting rods 4 and they correspond one to one, the sliders 5 are hinged to the first end of the corresponding connecting rods 4, and the second end of each connecting rod 4 is hinged to the connecting rod seat 3. The aluminum film wrapping mechanism of the lunch box sealing machine also includes a support frame lifting mechanism capable of driving the support frame 2 to rise and fall, and the support frame lifting mechanism is installed on the frame 1. Figure 1 The aluminum film wrapping mechanism shown includes three aluminum film wrapping units consisting of a connecting rod seat 3, multiple connecting rods 4, multiple sliders 5, multiple aluminum film edge folding parts 6, a mounting base plate 7, a guide groove 8, etc. The three aluminum film wrapping units are installed on the same support frame 2 and are lifted and lowered together under the control of the support frame lifting mechanism, so that three lunch boxes can be wrapped with aluminum film at the same time.

[0036] refer to Figure 1 The support frame lifting mechanism includes a support frame lifting cylinder 9, which is installed on the frame 1. The piston rod of the support frame lifting cylinder 9 faces downward and is connected to the support frame 2.

[0037] The connecting rod seat lifting mechanism comprises a connecting rod seat lifting cylinder 10 , which is mounted on the support frame 2 , and a piston rod of the connecting rod seat lifting cylinder 10 faces downward and is connected to the connecting rod seat 3 .

[0038] The number of the aluminum film edge folding parts 6 is determined according to the shape and size of the top opening of the lunch box. For example, in this embodiment, the top opening of the lunch box is a quadrilateral, and four aluminum film edge folding parts 6 are provided; each aluminum film edge folding part 6 corresponds to each corner of the top opening of the lunch box. Accordingly, four connecting rods 4 and four sliding blocks 5 are provided respectively.

[0039] In this embodiment, the connecting rod seat 3 is located directly above the center of the mounting base plate 7 .

[0040] In this embodiment, a positioning groove 71 capable of accommodating the top of the lunch box is provided on the lower surface of the central portion of the installation base plate 7 , and each aluminum film edge folding component 6 is located around the positioning groove 71 .

[0041] In this embodiment, a top opening 81 is provided at the top of the guide groove 8, and the groove bottom 82 of the guide groove 8 supports the slider 5; a slider limiting mechanism is provided at a position corresponding to each guide groove 8 on the upper surface of the mounting base 7; the slider limiting mechanism includes a strip limiting block 11, which is located on the upper side of the guide groove 8 (the strip limiting block 11 is located on the upper side of the middle part of the guide groove 8) and spans the guide groove 8. The slider limiting mechanism also includes two compression springs 12 and two guide columns 13. The two guide columns 13 are respectively located on both sides of the guide groove 8. The strip limiting block 11 is provided with two guide holes 14. The two guide holes 14 are respectively located at both ends of the strip limiting block 11. The two guide columns 13 are respectively located in the two guide holes 14. The two compression springs 12 are respectively sleeved on the two guide columns 13. The top of the guide column 13 is provided with a spring limiting block 15. The lower end and the upper end of the compression spring 12 are in close contact with the strip limiting block 11 and the spring limiting block 15 respectively. The two compression springs 12 apply a downward force to the strip limiting block 11, so that the lower surface of the strip limiting block 11 can contact the upper surface of the slider 5, and can prevent the slider 5 from detaching from the top opening 81 of the guide groove 8. In addition, the two compression springs 12 also play a buffering role.

[0042] In this embodiment, there is a gap 16 between the upper surface of the aluminum film edge folding component 6 and the lower surface of the mounting base plate 7; the inner end of the guide groove 8 has a slider limiting inner wall 83. An aluminum film pressing convex edge 61 is provided on the inner edge of the upper surface of the aluminum film edge folding component 6.

[0043] In this embodiment, the slider 5 is a strip-shaped slider, the outer end of the strip-shaped slider 5 is connected to the outer edge of the corresponding aluminum film edge folding component 6 through a connecting column 17, the inner end of the strip-shaped slider 5 is hinged to the first end of the corresponding connecting rod 4, and the bottom of the guide groove 8 is provided with a strip-shaped guide through hole 18 for the connecting column 17 to pass through. The connecting column 17 is in the strip-shaped guide through hole 18, and when the strip-shaped slider 5 moves along the guide groove 8, the connecting column 17 moves along the strip-shaped guide through hole 18. The outer end of the guide groove 8 has a first outer end opening 84, and the outer end of the strip guide through hole 18 has a second outer end opening 181. During assembly, the strip slider 5 can be inserted into the guide groove 8 through the first outer end opening 84, and the connecting column 17 can be inserted into the strip guide through hole 18 through the second outer end opening 181, which is more convenient for assembly; when the strip slider 5 moves outward along the guide groove 8, the outer end of the strip slider 5 can extend from the first outer end opening 84, and a part of the connecting column 17 can also extend from the second outer end opening 181.

[0044] The support frame 2 is provided with at least one (such as two) guide pillars 19 running up and down (the lower end of the guide pillars 19 is connected to the mounting base plate 7), and the connecting rod seat 3 is provided with at least one (such as two) guide sleeves 20. The number of guide sleeves 20 and the guide pillars 19 are the same and correspond one to one. The guide sleeves 20 are sleeved on the guide pillars 19 and can be raised and lowered along the guide pillars 19.

[0045] The following is a brief description of the working principle of this aluminum film wrapping mechanism:

[0046] refer to Figure 1 , Figure 4 , Figure 5 and Figure 6 When the aluminum film wrapping mechanism is in the initial state, the inner edges of the aluminum film edges and the folding parts 6 form a folding film space 02 that is slightly larger than the outer edge of the outer turning edge 011 of the lunch box 01 (the folding film space 02 is located directly below the positioning groove 71); refer to Figure 1 When the lunch box 01 covered with aluminum film reaches the aluminum film wrapping mechanism, a box supporting mechanism 03 can lift the lunch box 01 so that the outer flange 011 of the lunch box is higher than the conveying device; then the support frame lifting cylinder 9 drives the support frame 2 to descend, and the aluminum film and the opening at the top of the lunch box enter the above-mentioned film folding space. At this time, the edge of the aluminum film is bent downward under the obstruction of the inner edge of each aluminum film edge folding component 6, and at the same time, the outer flange 011 at the top of the lunch box 01 is in the positioning groove 71, which positions the lunch box 01 and can avoid the misalignment of the lunch box 01 in the subsequent further film folding operation.

[0047] In the initial state, the slider 5 is located near the outer end of the guide groove 8, and the bottom 82 of the guide groove 8 supports the slider 5. At this time, there is a gap 16 between the upper surface of the aluminum film edge folding part 6 and the lower surface of the mounting base 7. The two compression springs 12 exert a downward force on the strip stopper 11, so that the lower surface of the strip stopper 11 can contact the upper surface of the slider 5.

[0048] refer to Figure 7 and Figure 8 Then, the connecting rod seat lifting cylinder 10 drives the connecting rod seat 3 to rise, and the second end of each connecting rod 4 rises accordingly, and the first end of each connecting rod 4 drives each slider 5 to move inward along each guide groove 8. At this time, each aluminum film edge folding component 6 moves inward accordingly, pushing the edge part of the aluminum film inward so that it overlaps on the lower side of the outer flange 011 of the lunch box, thereby achieving the wrapping of the aluminum film on the top opening 012 of the lunch box.

[0049] During the process of folding the edge of the aluminum film inwardly, due to the downward pressure of the strip-shaped limit block 11 , the slider 5 will not move upwardly, and the slider 5 and the aluminum film edge folding component 6 move inwardly along the guide groove 8 .

[0050] refer to Figures 9 to 12When the inner end of the slider 5 contacts the slider limit inner wall 83 of the inner end of the guide groove 8, the slider 5 cannot continue to move inward. At this time, the connecting rod seat lifting cylinder 10 drives the connecting rod seat 3 to continue to rise, and the first end of each connecting rod 4 drives each slider 5 to rise (at this time, the slider 5 pushes the strip limit block 11 upward, and the two compression springs 12 are compressed; a gap appears between the slider 5 and the groove bottom 82 of the guide groove 8), and each aluminum film edge folding component 6 also rises (at this time, the gap 16 between the upper surface of the aluminum film edge folding component 6 and the lower surface of the mounting base 7 becomes smaller), and the edge portion of the aluminum film overlapped on the lower side of the outer flange 011 of the lunch box is pressed upward (when the aluminum film edge folding component 6 rises, the aluminum film pressing convex edge 61 presses upward the edge portion of the aluminum film overlapped on the lower side of the outer flange 011 of the lunch box), so that it is close to the lower side of the outer flange 011 of the lunch box, so that the aluminum film can more firmly wrap the top opening 012 of the lunch box.

[0051] In other implementation schemes, the support frame lifting mechanism may also use an electric motor as a power source to drive the support frame to rise and fall through a transmission mechanism (such as a cam mechanism, a connecting rod mechanism or a screw / nut structure).

[0052] In other implementation schemes, the connecting rod seat lifting mechanism may also use an electric motor as a power source to drive the connecting rod seat to rise and fall through a transmission mechanism (such as a cam mechanism, a connecting rod mechanism, or a screw / nut structure).

Claims

1. An aluminum film wrapping mechanism for a lunch box sealing machine, characterized in that It includes a support frame, a connecting rod seat, multiple connecting rods, multiple sliders and multiple aluminum film edge folding parts. The support frame is provided with a connecting rod seat lifting mechanism that can drive the connecting rod seat to rise and fall; the support frame is provided with a mounting base plate, and the mounting base plate is provided with multiple guide grooves extending from the outside to the inside. The number of guide grooves is the same as that of sliders and they correspond one to one. The sliders are installed in the guide grooves and can slide along the guide grooves. The number of sliders is the same as that of aluminum film edge folding parts and they correspond one to one. The aluminum film edge folding parts are located below the mounting base plate and are connected to the corresponding sliders; the number of sliders is the same as that of connecting rods and they correspond one to one. The sliders are hinged to the first ends of the corresponding connecting rods, and the second ends of each connecting rod are hinged to the connecting rod seat.

2. The aluminum film wrapping mechanism of the lunch box sealing machine according to claim 1 is characterized in that: The aluminum film wrapping mechanism of the lunch box sealing machine also includes a frame and a support frame lifting mechanism capable of driving the support frame to rise and fall, and the support frame lifting mechanism is installed on the frame.

3. The aluminum film wrapping mechanism of the lunch box sealing machine according to claim 2 is characterized in that: The support frame lifting mechanism comprises a support frame lifting cylinder, which is installed on the frame, and the piston rod of the support frame lifting cylinder faces downward and is connected to the support frame.

4. The aluminum film wrapping mechanism of the lunch box sealing machine according to any one of claims 1 to 3, characterized in that: The connecting rod seat is located just above the center of the mounting base plate.

5. The aluminum film wrapping mechanism of the lunch box sealing machine according to any one of claims 1 to 3, characterized in that: The top of the guide groove is provided with a top opening, and the bottom of the guide groove supports the slider; a slider limiting mechanism is respectively provided on the upper surface of the mounting base plate at a position corresponding to each guide groove; the slider limiting mechanism includes a strip limiting block, which is located on the upper side of the guide groove and spans the guide groove.

6. The aluminum film wrapping mechanism of the lunch box sealing machine according to claim 5 is characterized in that: The slider limiting mechanism also includes two compression springs and two guide columns, the two guide columns are respectively located on both sides of the guide groove, the strip limiting block is provided with two guide holes, the two guide holes are respectively located at both ends of the strip limiting block, the two guide columns are respectively located in the two guide holes, the two compression springs are respectively sleeved on the two guide columns, a spring limiting block is provided on the top of the guide column, and the lower end and the upper end of the compression spring are respectively in close contact with the strip limiting block and the spring limiting block.

7. The aluminum film wrapping mechanism of the lunch box sealing machine according to claim 6 is characterized in that: There is a gap between the upper surface of the aluminum film edge folding component and the lower surface of the mounting base plate; the inner end of the guide groove is provided with a slider limiting inner wall.

8. The aluminum film wrapping mechanism of the lunch box sealing machine according to claim 7 is characterized in that: An aluminum film pressing convex edge is arranged on the inner edge of the upper surface of the aluminum film edge folding component.

9. The aluminum film wrapping mechanism of the lunch box sealing machine according to any one of claims 1 to 3, characterized in that: A positioning groove capable of accommodating the top of the lunch box is arranged on the lower surface of the central part of the installation bottom plate, and each aluminum film edge folding part is located around the positioning groove.

10. The aluminum film wrapping mechanism of the lunch box sealing machine according to claim 1, characterized in that: The slider is a strip-shaped slider, the outer end of which is connected to the outer edge of the corresponding aluminum film edge folding component through a connecting column, the inner end of which is hinged to the first end of the corresponding connecting rod, and the bottom of the guide groove is provided with a strip-shaped guide through hole for the connecting column to pass through; The outer end of the guide groove has a first outer end opening, and the outer end of the strip-shaped guide through hole has a second outer end opening; The support frame is provided with at least one guide post extending up and down, and the connecting rod seat is provided with at least one guide sleeve, the number of the guide sleeves is the same as that of the guide posts and they correspond one to one, and the guide sleeve is sleeved on the guide post and can be lifted and lowered along the guide post; The connecting rod seat lifting mechanism comprises a connecting rod seat lifting cylinder, which is installed on the supporting frame, and the piston rod of the connecting rod seat lifting cylinder faces downward and is connected to the connecting rod seat.

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