Lunch box sealing machine

Abstract

A lunch box sealing machine comprises a frame, a lunch box conveying device, a lunch box adding device and a lunch box exiting device, characterized in that: the lunch box sealing machine also comprises a film storage mechanism, an aluminum film suction and release mechanism, an aluminum film wrapping mechanism and a box holding mechanism, the lunch box adding device, the aluminum film suction and release mechanism, the aluminum film wrapping mechanism and the lunch box exiting device are arranged in sequence from front to back along the conveying direction of the lunch box conveying device, the film storage mechanism is arranged on one side of the aluminum film suction and release mechanism, and the box holding mechanism is located below the aluminum film wrapping mechanism; the lunch box conveying device comprises an annular template belt, the annular template belt comprises a plurality of templates arranged in sequence along its length direction, and the template is provided with at least one lunch box placement hole; the box holding mechanism comprises a box holding plate and a box holding plate lifting mechanism capable of driving the box holding plate to lift. The lunch box sealing machine of the present invention can automatically place the aluminum film on the opening at the top of the lunch box and wrap the opening at the top of the lunch box, which is conducive to improving production efficiency.

Description

Technical Field

[0001] The invention relates to a machine for packaging materials, in particular to 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, it is necessary to wrap the opening at the top of the lunch box with aluminum film to package the food. In the prior art, aluminum film is mostly wrapped manually, which is inefficient and difficult to ensure product quality and hygiene. To this end, the applicant developed a lunch box sealing machine that can automatically place aluminum film on the opening at the top of the lunch box (the lunch box is pre-loaded with food) and wrap the opening at the top of the lunch box to improve production efficiency and ensure product quality and hygiene. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a lunch box sealing machine, which can automatically place an aluminum film on the opening at the top of the lunch box and wrap the opening at the top of the lunch box, which is conducive to improving production efficiency. The technical solution adopted is as follows:

[0006] A lunch box sealing machine comprises a frame, a lunch box conveying device, a lunch box adding device and a lunch box withdrawing device, wherein the lunch box conveying device, the lunch box adding device and the lunch box withdrawing device are all mounted on the frame, and is characterized in that: the lunch box sealing machine also comprises a film storage mechanism, an aluminum film suction and release mechanism, an aluminum film wrapping mechanism and a box holding mechanism, wherein the film storage mechanism, the aluminum film suction and release mechanism, the aluminum film wrapping mechanism and the box holding mechanism are all mounted on the frame; the lunch box adding device, the aluminum film suction and release mechanism, the aluminum film wrapping mechanism and the lunch box withdrawing device are arranged in sequence from front to back along the conveying direction of the lunch box conveying device, the film storage mechanism is arranged on one side of the aluminum film suction and release mechanism, and the box holding mechanism is located below the aluminum film wrapping mechanism; the lunch box conveying device comprises an annular template belt, wherein the annular template belt comprises a plurality of templates arranged in sequence along its length direction, and at least one lunch box placement hole is provided on the template; the box holding mechanism comprises a box holding plate and a box holding plate lifting mechanism capable of driving the box holding plate to lift.

[0007] The lunch box placement hole on the template is used to accommodate the lunch box. Usually, the outer side of the opening at the top of the lunch box has an outer flange. When the lunch box is placed in the lunch box placement hole, the outer flange at the top of the lunch box contacts the solid part around the lunch box placement hole, so that the template supports the lunch box.

[0008] In the previous process, the food filling machine puts the food into the lunch box and conveys the lunch box with the food to the position corresponding to the lunch box adding device. When the lunch box sealing machine is working, the lunch box adding device puts the lunch box into the lunch box placement hole corresponding to its position on the lunch box conveying device, with the top opening of the lunch box facing upwards; then, the lunch box conveying device conveys the lunch box to the position corresponding to the aluminum film suction and release mechanism, and the aluminum film suction and release mechanism sucks the aluminum film from the film storage mechanism and places the aluminum film on the top opening of the lunch box; then, the lunch box conveying device conveys the lunch box with the aluminum film stacked on it to the aluminum film wrapping mechanism, at which time, the box plate lifting mechanism in the box holding mechanism drives the box plate to rise, lifts the lunch box in the lunch box placement hole, and then the aluminum film wrapping mechanism wraps the aluminum film around the top opening of the lunch box; finally, the lunch box exiting device removes the lunch box wrapped with aluminum film from the lunch box conveying device.

[0009] Usually, the above-mentioned annular template belt includes an annular conveyor belt and multiple templates installed on the annular conveyor belt. Each template is arranged at equal intervals on the annular conveyor belt, and multiple lunch box placement holes arranged horizontally are provided on the template; the annular conveyor belt is tensioned by a driving pulley and a driven pulley, and the driving pulley is driven by a motor to rotate to realize the transportation of the template and the lunch box on it. The annular conveyor belt can be replaced by an annular chain. Each lunch box placement hole on the template can accommodate a lunch box containing food, and the lunch box sealing machine can simultaneously place aluminum film on multiple lunch boxes, wrap aluminum film, etc.

[0010] Usually, the above-mentioned lunch box conveying device has a forward section and a return section, the box holding mechanism is located below the forward section of the lunch box conveying device, and the aluminum film wrapping mechanism is located above the forward section of the lunch box conveying device. The travel direction of the forward section of the lunch box conveying device is the conveying direction of the lunch box conveying device.

[0011] In the present invention, the transverse direction refers to a direction perpendicular to the conveying direction of the lunch box conveying device, which is usually also called the left-right direction.

[0012] In a preferred embodiment, the above-mentioned film storage mechanism is arranged on the front side or the rear side of the aluminum film suction and release mechanism.

[0013] In the preferred embodiment, the film storage mechanism includes a film placing seat, a film pushing base plate, a first lifting seat, a first servo motor and a first lifting transmission mechanism; the film placing seat is fixedly mounted on the frame, and the film pushing base plate is mounted on the first lifting seat; the film placing seat has a cavity, and the top of the cavity of the film placing seat has a film taking port, and the top of the film placing seat is provided with a plurality of stopper metal elastic sheets, a part of the stopper metal elastic sheet extends into the film taking port, and the part of the stopper metal elastic sheet extending into the film taking port constitutes an aluminum film stopper, and the film pushing base plate is in the cavity of the film placing seat, and the side wall of the film placing seat and the upper surface of the film pushing base plate together form an aluminum film containing cavity capable of storing aluminum film; the power output shaft of the first servo motor is transmission-connected with the power input end of the first lifting transmission mechanism, and the power output end of the first lifting transmission mechanism is connected with the first lifting seat, and the first servo motor drives the first lifting seat and the film pushing base plate to rise and fall through the first lifting transmission mechanism. The first servo motor can be set with an output torque of appropriate size. In the initial state, the film pushing base plate is at the bottom of the cavity of the film placing seat, at this time, a stack of aluminum film can be added to the film pushing base plate, and the aluminum film is in the aluminum film cavity; when working, the first servo motor drives the first lifting seat, the film pushing base plate and the aluminum film in the aluminum film cavity to rise together, and when the edge of the uppermost aluminum film contacts the aluminum film stopper of each stop metal elastic sheet, the stack of aluminum film is blocked by the aluminum film stopper of each stop metal elastic sheet, so that the load of the first servo motor exceeds the set output torque and pauses; after the aluminum film suction and release mechanism sucks the uppermost aluminum film from the film taking port of the film placing seat (when the aluminum film suction and release mechanism sucks the uppermost aluminum film, the edge of the aluminum film, each The stop metal elastic sheet is slightly deformed, so that the aluminum film can pass through the film taking port), and a gap appears between the second upper aluminum film and the aluminum film stop part of the stop metal elastic sheet. At this time, the first servo motor continues to drive the first lifting seat, the film pushing bottom plate and the stack of aluminum films to rise, and the second upper aluminum film becomes the new top aluminum film; when the edge of the new top aluminum film contacts the aluminum film stop parts of each stop metal elastic sheet, it is blocked by the aluminum film stop parts of each stop metal elastic sheet, causing the first servo motor to pause again; in this way, each sheet of aluminum film in the stack of aluminum films is lifted one by one to the film taking port of the film placing seat, so as to realize a continuous supply of aluminum film for the aluminum film suction and placing mechanism to take. When aluminum film needs to be added, the first servo motor drives the first lifting seat and the film pushing bottom plate to descend and return to the initial state. There can be multiple first lifting transmission mechanisms, and multiple first lifting transmission mechanisms can be driven by the same first servo motor.

[0014] The film storage mechanism may further include a film shortage detection photoelectric eye for detecting whether the aluminum film in the aluminum film cavity is used up or about to be used up. When the film shortage detection photoelectric eye detects whether the aluminum film in the aluminum film cavity is used up (or about to be used up), a prompt signal is issued to remind the staff to add aluminum film.

[0015] The operation of adding aluminum film can be done manually. In order to ensure the continuity of production, the lunch box sealing machine can be equipped with two film storage mechanisms and two aluminum film suction and release mechanisms. The two film storage mechanisms correspond to the two aluminum film suction and release mechanisms one by one. The two film storage mechanisms work alternately, and accordingly, the two aluminum film suction and release mechanisms also work alternately. When one of the film storage mechanisms needs to add aluminum film, the film storage mechanism and the corresponding aluminum film suction and release mechanism are suspended, while the other film storage mechanism and the corresponding aluminum film suction and release mechanism work normally.

[0016] In a specific solution, the first lifting transmission mechanism includes a first housing, a first power input shaft, a first transmission gear set, a first power output shaft, a first lifting screw and a first nut. The first transmission gear set is installed in the first housing, the first power input shaft is rotatably installed on the first housing in the horizontal direction, the first power output shaft is rotatably installed on the first housing in the vertical direction, the first gear of the first transmission gear set is installed on the first power input shaft, the final gear of the first transmission gear set is installed on the first power output shaft, the lower end of the first lifting screw is connected to the upper end of the first power output shaft through a first coupling; the first nut is screwed with the first lifting screw, the first nut constitutes the power output end of the first lifting transmission mechanism, and the first nut is installed on the first lifting seat. The first power input shaft is connected to the power output shaft of the first servo motor by transmission, for example, by a coupling. In addition, a first base can be provided below the first housing, and the first housing is fixedly mounted on the first base.

[0017] In the preferred embodiment, the above-mentioned aluminum film suction and release mechanism includes a tip rack and a tip rack position switching mechanism capable of switching the position of the tip rack, and the tip rack position switching mechanism is installed on the frame; the tip rack includes a tip mounting plate, and at least one tip group is provided on the tip mounting plate, and a tip group includes multiple tips; the tip mounting plate is provided with multiple first guide through holes running up and down, and the first guide through holes are the same as the total number of tips and correspond one to one; the tip includes a lifting guide column, a first compression spring, an upper limit component, a suction cup seat and a suction cup, the lifting guide column is in the corresponding first guide through hole, the suction cup seat is installed at the lower end of the lifting guide column, the suction cup is installed on the suction cup seat, the first compression spring is sleeved on the lifting guide column, the lower end of the first compression spring can apply a downward force to the suction cup seat, and the upper limit component is installed at the upper end of the lifting guide column and contacts and cooperates with the upper surface of the tip mounting plate.

[0018] According to the number of aluminum films that need to be sucked and released at the same time, the suction heads are divided into a corresponding number of suction head groups; when working, one suction head group corresponds to one aluminum film. When working, multiple suction heads in the same suction head group respectively adsorb different parts of the aluminum film, so that the forces on various parts of the aluminum film are more balanced, and the deformation of the aluminum film can be effectively reduced when the aluminum film is transferred. Moreover, in the above suction head, the lower end of the first compression spring applies a downward force to the suction cup seat, so that the suction cup seat has a tendency to move downward. In the initial state, due to the action of the first compression spring, the upper limit component is in close contact with the upper surface of the suction head mounting plate to prevent the suction cup from moving further downward. The first compression spring plays a buffering role. When the aluminum film is sucked from the film storage mechanism, if different parts of the aluminum film are at different heights, the suction cups and the bottoms of the suction cup seats of some suction heads will first contact the higher parts of the aluminum film. After the suction head mounting plate continues to descend, the suction cups and the suction cup seats of these suction heads will no longer descend due to obstruction, causing the first compression spring to shrink slightly. Thus, it will not hinder the suction cups of other suction heads from descending and adsorbing the lower parts of the aluminum film, thereby allowing the suction cups of each suction head in the same suction head group to be adsorbed to the aluminum film, allowing the suction head group to reliably adsorb the aluminum film.

[0019] The number of suction heads in a suction head group and their arrangement can be set according to the shape and area of ​​the aluminum film. For example, when the aluminum film is rectangular, each suction head group includes four suction heads, and the four suction heads respectively adsorb positions on the aluminum film near its four corners; or, when the aluminum film is rectangular, each suction head group includes five suction heads, one of which adsorbs the middle part of the aluminum film, and the remaining four suction heads adsorb the four corners of the aluminum film respectively.

[0020] Usually, the lower end and the upper end of the first compression spring are in close contact with the top of the suction cup seat and the lower surface of the suction head mounting plate respectively; the suction cup is installed at the bottom of the suction cup seat.

[0021] In a more preferred embodiment, a plurality of upper limit grooves with notches facing downwards are provided on the lower surface of the above-mentioned suction head mounting plate, the number of the upper limit grooves is the same as that of the first guide through holes and they correspond one to one, the upper limit grooves are located below the first guide through holes, and the upper end of the first compression spring is located in the upper limit groove and in close contact with the bottom of the upper limit groove.

[0022] In a more preferred embodiment, a lower limit groove with a notch facing upward is provided on the top of the suction cup seat, and the lower end of the first compression spring is located in the lower limit groove and in close contact with the bottom of the lower limit groove.

[0023] In a more preferred embodiment, the upper end of the lifting guide column has an external thread section, and the upper limit component is provided with a screw hole, and the upper limit component is mounted on the external thread section through the screw hole. In this case, the position of the upper limit component on the external thread section can be fine-tuned as needed, thereby adjusting the initial height position of the suction cup.

[0024] In a more preferred embodiment, the tip rack further comprises a frame and a tip mounting plate lifting mechanism capable of driving the tip mounting plate to rise and fall, and the tip mounting plate lifting mechanism is mounted on the frame. When the aluminum film is sucked and placed, the tip rack position switching mechanism drives the tip rack and each tip to move together to the top of the film storage mechanism, and then the tip mounting plate lifting mechanism drives the tip mounting plate and each tip to descend, so that the suction cup of each tip contacts the upper surface of the aluminum film, the cavity of the suction cup is evacuated, the suction cup wall is deformed and close to the aluminum film, and the aluminum film is sucked; then the tip mounting plate lifting mechanism drives the tip mounting plate and each tip to rise, and the aluminum film is taken out of the film storage mechanism; then the tip rack position switching mechanism drives the tip rack, each tip and the aluminum film to move together to the top of the lunch box; then the tip mounting plate lifting mechanism drives the tip mounting plate, each tip and the aluminum film to descend, and then releases the vacuum suction of the suction cup on the aluminum film, and the aluminum film is superimposed on the opening at the top of the lunch box, thereby completing a round of suction, transfer, and placement of the aluminum film.

[0025] In a further preferred embodiment, the suction head mounting plate lifting mechanism comprises a suction head mounting plate lifting cylinder, which is mounted on the frame, and the piston rod of the suction head mounting plate lifting cylinder faces downward and is connected to the suction head mounting plate. There may be multiple or one suction head mounting plate lifting cylinder. The suction head mounting plate lifting mechanism may also use an electric motor as a power source, and drive the suction head mounting plate to rise and fall through a transmission mechanism (such as a cam mechanism, a connecting rod mechanism, or a screw / nut structure).

[0026] The suction head mounting plate may be a whole or may be composed of a plurality of suction head mounting plate units.

[0027] In a more preferred embodiment, a first gas channel is provided in the lifting guide column, and a second gas channel is provided in the suction cup seat, and the second gas channel connects the cavity of the suction cup with the lower end of the first gas channel. The upper end of the first gas channel is used to connect with a vacuum pumping device, and the vacuum pumping device can vacuum the cavity of the suction cup through the first gas channel and the second gas channel.

[0028] In a specific scheme, the above-mentioned tip rack position switching mechanism includes a flip servo motor, a reducer, a flip shaft, a flip bracket, a tip rack support shaft, a driving pulley, a transmission belt and a driven pulley; the flip servo motor and the reducer are fixedly mounted on the frame, the flip shaft is rotatably mounted on the frame, the power output shaft of the flip servo motor is transmission-connected with the power input shaft of the reducer, the power output shaft of the reducer is transmission-connected with one end of the flip shaft, the flip bracket is fixedly mounted on the flip shaft, the tip rack support shaft is rotatably mounted on the flip bracket, the tip rack support shaft and the flip shaft are parallel to each other, the tip rack is mounted on the tip rack support shaft (in the case where the tip rack includes a frame body and a tip mounting plate lifting mechanism, the frame body of the tip rack is mounted on the tip rack support shaft), the driving pulley is fixedly mounted on the flip shaft, the driven pulley is fixedly mounted on the tip rack support shaft, the driving pulley is transmission-connected with the driven pulley through a transmission belt, and the transmission ratio of the driving pulley to the driven pulley is 1. When the flip servo motor is running, the flip shaft is driven to rotate through the reducer, and the flip bracket rotates around the flip shaft, switching the position of the suction head rack support shaft and the suction head rack; at the same time, the active pulley rotates with the flip shaft, and the driven pulley and the suction head rack support shaft are driven by the transmission belt to rotate relative to the flip bracket, so that the suction head rack and each suction head maintain their original posture (for example, the suction cup is always kept at the bottom).

[0029] In another specific solution, the above-mentioned tip rack position switching mechanism includes a lifting mechanism, a second lifting seat, a translation mechanism and a translation seat. The lifting mechanism is installed on the frame and can drive the second lifting seat to lift and lower. The translation mechanism is installed on the second lifting seat and can drive the translation seat to translate. The tip rack is installed on the translation seat (when the tip rack includes a frame body and a tip mounting plate lifting mechanism, the frame body of the tip rack is installed on the translation seat). Alternatively, the above-mentioned tip rack position switching mechanism includes a translation mechanism, a translation seat, a lifting mechanism and a second lifting seat. The translation mechanism is installed on the frame and can drive the translation seat to translate. The lifting mechanism is installed on the translation seat and can drive the second lifting seat to lift and lower. The tip rack is installed on the second lifting seat (when the tip rack includes a frame body and a tip mounting plate lifting mechanism, the frame body of the tip rack is installed on the second lifting seat). The above-mentioned lifting mechanism and translation mechanism can both adopt existing technologies.

[0030] In the preferred embodiment, the aluminum film wrapping mechanism includes a support frame, a connecting rod seat, a plurality of first connecting rods, a plurality of sliders and a plurality of aluminum film edge folding components. 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, and the mounting base plate is provided with a plurality of 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 components and they correspond one to one. The aluminum film edge folding components are located below the mounting base plate and connected to the corresponding sliders. The number of sliders is the same as that of first connecting rods and they correspond one to one. The sliders are hinged to the first end of the corresponding first connecting rod, and the second end of each first connecting rod is hinged to the connecting rod seat. The guide grooves extend from the outside to the inside, which means that the guide grooves extend from the edge of the mounting base plate to the center of the mounting base plate.

[0031] 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.

[0032] 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 more 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).

[0033] When the above-mentioned aluminum film wrapping mechanism is in the initial state, the inner edges of the folding components of the aluminum film edge surround 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, the lunch box can be lifted by the box supporting mechanism so that the outer flange of the lunch box is higher than the lunch box 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 edge; then the connecting rod seat lifting mechanism drives the connecting rod seat to rise, and the second ends of the first connecting rods rise accordingly, and the first ends of the first 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 inward along with the inward movement 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.

[0034] Usually, 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.

[0035] In a more 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.

[0036] Usually, the bottom of the guide groove supports the slider, providing support for the slider and the folding part of the aluminum film edge.

[0037] In a more 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.

[0038] In a further preferred embodiment, the slider limit mechanism further includes two second 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 second 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 second compression spring are respectively in close contact with the strip limit block and the spring limit block. The two second 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 second compression springs also play a buffering role.

[0039] 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; and the inner end of the guide groove has a slider limiting inner wall. In the initial state, the slider is in a position close to 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 limit 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 inner wall of the slider limit at the inner end of the guide groove, the slider cannot continue to move inward. At this time, the connecting rod seat lifting mechanism drives the connecting rod seat to continue to rise, and the first end of each first connecting rod drives each slider to rise (at this time, the slider pushes the strip limit block upward, and the two second compression springs are compressed), and each aluminum film edge folding component also rises, pressing the aluminum film overlapped on the edge part of 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, thereby making the aluminum film more firmly wrap the top opening of the lunch box. 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.

[0040] In a more 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 first 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.

[0041] In a further 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.

[0042] In a more preferred embodiment, the support frame is provided with at least one guide column extending up and down, and the connecting rod seat is provided with at least one first guide sleeve. The number of the first guide sleeves is the same as that of the guide columns and they correspond one to one. The first guide sleeve is sleeved on the guide column and can be lifted and lowered along the guide column.

[0043] In a more 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 may 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).

[0044] In a preferred embodiment, the box support plate lifting mechanism comprises a second servo motor, a horizontal rotating shaft, a crank, a second connecting rod, a lifting rod and a second guide sleeve. The second servo motor and the second guide sleeve are both mounted on a frame. The horizontal rotating shaft can be rotatably mounted on the frame in a horizontal direction. The lifting rod is in the second guide sleeve and can be lifted and lowered relative to the second guide sleeve. The power output shaft of the second servo motor is connected to the horizontal rotating shaft in a transmission manner. The first end of the crank is fixedly connected to the horizontal rotating shaft. The second end of the crank is hinged to the lower end of the second connecting rod. The upper end of the second connecting rod is hinged to the lower end of the lifting rod. The upper end of the lifting rod is connected to the box support plate. When the second servo motor is running, its power output shaft drives the horizontal rotating shaft to rotate forward or reversely, and the horizontal rotating shaft drives the crank to swing back and forth around the horizontal rotating shaft at a certain angle. The crank drives the lifting rod and the box support plate to lift and lower a certain distance along the second guide sleeve through the second connecting rod. The second servo motor can be connected to the horizontal rotating shaft in a transmission manner through a reducer.

[0045] In another preferred embodiment, the above-mentioned box support plate lifting mechanism includes a box support plate lifting cylinder, the cylinder body of the box support plate lifting cylinder is installed on the frame, and the piston rod of the box support plate lifting cylinder faces upward and is connected to the box support plate.

[0046] The above-mentioned lunch box conveying device, lunch box adding device, and lunch box withdrawing device can all adopt existing technologies. For example, the lunch box adding device and the lunch box withdrawing device can both adopt a robot, which can take out the lunch box from one position, transfer it to another position and put it down.

[0047] The lunch box sealing machine of the present invention can automatically place the aluminum film on the top opening of the lunch box and wrap the top opening of the lunch box, which is beneficial to improving production efficiency and ensuring product quality and hygiene. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0049] Figure 2 yes Figure 1 A top view of the lunch box sealing machine shown;

[0050] Figure 3 It is a structural schematic diagram of a film storage mechanism and an aluminum film suction and release mechanism in a preferred embodiment of the present invention;

[0051] Figure 4 yes Figure 3A top view of the film storage mechanism and the aluminum film suction and release mechanism shown;

[0052] Figure 5 yes Figure 3 The schematic diagram of the structure of the suction head in the aluminum film suction and placement mechanism shown;

[0053] Figure 6 It is a schematic diagram of the overall structure of the aluminum film wrapping mechanism in a preferred embodiment of the present invention;

[0054] Figure 7 : is a structural schematic diagram of the aluminum film wrapping mechanism in a preferred embodiment of the present invention (initial state; the support frame lifting mechanism is not shown);

[0055] Figure 8 yes Figure 7 AA section view;

[0056] Fig. 9 yes Figure 7 BB cross-sectional view;

[0057] Fig.10 yes Figure 7 CC section view;

[0058] Fig.11 yes Figure 7 A perspective view of the structure shown (looking from bottom to top);

[0059] Fig.12 : is a structural schematic diagram of the aluminum film wrapping mechanism in a preferred embodiment of the present invention (first working state; the support frame lifting mechanism is not shown);

[0060] Fig.13 yes Fig.12 DD cross-sectional view;

[0061] Fig.14 : is a structural schematic diagram of the aluminum film wrapping mechanism in a preferred embodiment of the present invention (second working state; the support frame lifting mechanism is not shown);

[0062] Fig.15 yes Fig.14 EE cross-sectional view;

[0063] Fig.16 yes Fig.14 FF cross-sectional view;

[0064] Fig.17 yes Fig.14 A perspective view of the structure shown.

[0065] Fig.18 It is a structural schematic diagram of a box-holding mechanism in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0066] like Figure 1 and Figure 2 As shown, the lunch box sealing machine of this embodiment includes a frame 1, a lunch box conveying device 2, a lunch box adding device 3, a film storage mechanism 4, an aluminum film suction and release mechanism 5, an aluminum film wrapping mechanism 6, a box holding mechanism 7 and a lunch box exiting device 8. The lunch box conveying device 2, the lunch box adding device 3, the film storage mechanism 4, the aluminum film suction and release mechanism 5, the aluminum film wrapping mechanism 6, the box holding mechanism 7 and the lunch box exiting device 8 are all installed on the frame 1. The lunch box adding device 3, the aluminum film suction and release mechanism 5, the aluminum film wrapping mechanism 6 and the lunch box exiting device 8 are arranged in sequence from front to back along the conveying direction of the lunch box conveying device 2. The film storage mechanism 4 is arranged on one side of the aluminum film suction and release mechanism 5, and the box holding mechanism 7 is located below the aluminum film wrapping mechanism 6. The box holding mechanism 7 includes a box holding plate 71 and a box holding plate lifting mechanism 72 capable of driving the box holding plate 71 to rise and fall.

[0067] The lunch box conveying device 2 includes an annular template belt, which includes a plurality of templates 22 arranged in sequence along its length direction, and at least one lunch box placement hole 23 is provided on the template 22. In this embodiment, the annular template belt includes an annular conveyor belt 21 (the annular conveyor belt can be replaced by an annular chain) and a plurality of templates 22 installed on the annular conveyor belt, each template 22 is arranged at equal intervals on the annular conveyor belt 21, and a plurality of (e.g., six) lunch box placement holes 23 arranged transversely are provided on the template 22. The annular conveyor belt 21 is tensioned by a driving pulley and a driven pulley, and the driving pulley is driven by a motor to rotate to realize the conveyance of the template and the lunch box thereon.

[0068] The lunch box placement holes 23 are used to accommodate lunch boxes. Each lunch box placement hole 23 on the template 22 can accommodate a lunch box containing food, and the lunch box sealing machine can simultaneously place aluminum film and wrap aluminum film on multiple lunch boxes. The outer side of the opening at the top of the lunch box has an outer flange. When the lunch box is placed in the lunch box placement hole 23, the outer flange at the top of the lunch box contacts the solid part around the lunch box placement hole, so that the template supports the lunch box.

[0069] The lunch box conveying device 2 has a forward section 2-1 and a return section (the return section is below the forward section 2-1), the box holding mechanism 7 is below the forward section 2-1 of the lunch box conveying device, and the aluminum film wrapping mechanism 6 is above the forward section 2-1 of the lunch box conveying device. The moving direction of the forward section 2-1 of the lunch box conveying device is the conveying direction of the lunch box conveying device 2.

[0070] The lunch box sealing machine of this embodiment is equipped with two film storage mechanisms 4 and two aluminum film suction and release mechanisms 5. The two film storage mechanisms 4 are matched with the two aluminum film suction and release mechanisms 5 in a one-to-one manner. The two film storage mechanisms 4 work alternately, and correspondingly, the two aluminum film suction and release mechanisms 5 also work alternately. When one of the film storage mechanisms 4 needs to add aluminum film, the film storage mechanism 4 and the corresponding aluminum film suction and release mechanism 5 are suspended, while the other film storage mechanism 4 and the corresponding aluminum film suction and release mechanism 5 work normally. The film storage mechanism 4 is arranged at the front side of the corresponding aluminum film suction and release mechanism 5.

[0071] refer to Figure 3 and Figure 4In this embodiment, the film storage mechanism 4 includes a film placing seat 41, a film pushing bottom plate 42, a first lifting seat 43, a first servo motor 44 and a first lifting transmission mechanism; the film placing seat 41 is fixedly installed on the frame 1, and the film pushing bottom plate 42 is installed on the first lifting seat 43; the film placing seat 41 has a cavity, and the top of the cavity of the film placing seat 41 has a film taking port 45, and the top of the film placing seat 41 is provided with a plurality of stop metal elastic sheets 46, and a part of the stop metal elastic sheet 46 extends into the film taking port, and the stop metal elastic sheet 46 extends into the taking port. The film mouth portion constitutes an aluminum film stopper 461, the film pushing bottom plate 42 is in the cavity of the film placing seat 41, and the side wall of the film placing seat 41 and the upper surface of the film pushing bottom plate 42 together form an aluminum film containing cavity 47 capable of storing the aluminum film; the power output shaft of the first servo motor 44 is connected to the power input end of the first lifting transmission mechanism, and the power output end of the first lifting transmission mechanism is connected to the first lifting seat 43. The first servo motor 44 drives the first lifting seat 43 and the film pushing bottom plate 42 to rise and fall through the first lifting transmission mechanism. The first servo motor 44 can be set with an output torque of appropriate size. The first lifting transmission mechanism comprises a first housing 48, a first power input shaft 49, a first transmission gear set, a first power output shaft 410, a first lifting screw 411 and a first nut 412. The first transmission gear set is installed in the first housing 48. The first power input shaft 49 is rotatably installed on the first housing 48 in the horizontal direction. The first power output shaft 410 is rotatably installed on the first housing 48 in the vertical direction. The first gear of the first transmission gear set is installed on the first power input shaft 49. The final gear of the first transmission gear set is installed on the first power output shaft 410. The lower end of the first lifting screw 411 is connected to the upper end of the first power output shaft 410 through a first coupling 413. The first nut 412 is screwed with the first lifting screw 411. The first nut 412 constitutes the power output end of the first lifting transmission mechanism. The first nut 412 is installed on the first lifting seat 43. The first power input shaft 49 is connected to the power output shaft of the first servo motor 44 by transmission, for example, by a coupling. In addition, a first base 414 may be provided below the first housing 48, and the first housing 48 is fixedly mounted on the first base 414. In order to enable the first lifting seat 43 to be lifted and lowered more smoothly, the film storage mechanism 4 of this embodiment includes two first lifting transmission mechanisms arranged side by side.

[0072] In this embodiment, the film storage mechanism 4 includes six film placing seats 41 and six film pushing base plates 42. The six film placing seats 41 are arranged at equal intervals in the horizontal direction, and the film pushing base plates 42 correspond one by one to the film placing seats 41. The film storage mechanism 4 has six aluminum film cavities 47 (i.e., six film storage units) that can store aluminum films, and each aluminum film cavity 47 stores a stack of aluminum films respectively.

[0073] The film storage mechanism 4 may also include a film shortage detection photoelectric eye for detecting whether the aluminum film in the aluminum film cavity is used up or about to be used up. When the film shortage detection photoelectric eye detects whether the aluminum film in the aluminum film cavity is used up (or about to be used up), a prompt signal is issued to remind the staff to add aluminum film.

[0074] like Figure 3-Figure 5 As shown, the aluminum film suction and release mechanism 5 includes a tip rack 52 and a tip rack position switching mechanism 54 capable of switching the position of the tip rack 52 , and the tip rack position switching mechanism 54 is installed on the frame 1 .

[0075] In this embodiment, the suction head rack 52 includes a suction head mounting plate 521, a frame 522, and a suction head mounting plate lifting mechanism capable of driving the suction head mounting plate 521 to rise and fall, and the suction head mounting plate lifting mechanism is installed on the frame 522. The suction head mounting plate lifting mechanism includes a suction head mounting plate lifting cylinder 523, which is installed on the frame 522, and the piston rod of the suction head mounting plate lifting cylinder 523 faces downward and is connected to the suction head mounting plate 521. Figure 3 and Figure 4 In this embodiment, the suction head mounting plate 521 is composed of two suction head mounting plate units 5211; four suction head mounting plate lifting cylinders 523 are provided, and every two suction head mounting plate lifting cylinders 523 correspond to one suction head mounting plate unit 5211.

[0076] At least one (e.g., six) suction head group 53 is provided on the suction head mounting plate 521, and one suction head group 53 includes a plurality of (e.g., four) suction heads 531. The number of suction heads in one suction head group and their arrangement can be set according to the shape and area of ​​the aluminum film. For example, when the aluminum film is rectangular, each suction head group includes four suction heads, and the four suction heads are respectively attached to the positions near the four corners of the aluminum film.

[0077] The suction head mounting plate 521 is provided with a plurality of first guide holes 524 extending in an up-and-down direction, and the total number of the first guide holes 524 and the suction heads 531 are the same and correspond one to one. Figure 5 The suction head 531 includes a lifting guide column 5311, a first compression spring 5312, an upper limit component 5313, a suction cup seat 5314 and a suction cup 5315. The lifting guide column 5311 is located in the corresponding first guide through hole 524. The suction cup seat 5314 is installed at the lower end of the lifting guide column 5311. The suction cup 5315 is installed on the suction cup seat 5314. The first compression spring 5312 is sleeved on the lifting guide column 5311. The lower end of the first compression spring 5312 can apply a downward force to the suction cup seat 5314. The upper limit component 5313 is installed at the upper end of the lifting guide column 5311 and contacts and cooperates with the upper surface of the suction head mounting plate 521.

[0078] The lower end and the upper end of the first compression spring 5312 are in close contact with the top of the suction cup seat 5314 and the lower surface of the suction head mounting plate 521 respectively; the suction cup 5315 is installed at the bottom of the suction cup seat 5314. In this embodiment, a plurality of upper limit grooves 525 with notches facing downwards are provided on the lower surface of the suction head mounting plate 521. The number of the upper limit grooves 525 is the same as that of the first guide through holes 524 and they correspond one to one. The upper limit grooves 525 are located below the first guide through holes 524. The upper end of the first compression spring 5312 is located in the upper limit groove 525 and in close contact with the bottom of the upper limit groove 525. The top of the suction cup seat 5314 is provided with a lower limit groove 5316 with notches facing upwards. The lower end of the first compression spring 5312 is located in the lower limit groove 5316 and in close contact with the bottom of the lower limit groove 5316.

[0079] The upper end of the lifting guide column 5311 has an external thread section 5317, and a screw hole is provided in the upper limit component 5313, and the upper limit component 5313 is installed on the external thread section 5317 through the screw hole. The position of the upper limit component 5313 on the external thread section 5317 can be fine-tuned as needed, thereby adjusting the initial height position of the suction cup 5315.

[0080] A first gas channel 5318 is provided in the lifting guide column 5311, and a second gas channel 5319 is provided in the suction cup seat 5314. The second gas channel 5319 connects the cavity of the suction cup 5315 with the lower end of the first gas channel 5318. The upper end of the first gas channel 5318 is connected to the vacuum device through the gas pipe joint 53110, and the vacuum device can vacuum the cavity of the suction cup 5315 through the gas pipe joint 53110, the first gas channel 5318, and the second gas channel 5319.

[0081] In this embodiment, the suction head rack position switching mechanism 54 includes a flip servo motor 541, a reducer 542, a flip shaft 543, a flip bracket 544, a suction head rack support shaft 545, a driving pulley 546, a transmission belt 547 and a driven pulley 548; the flip servo motor 541 and the reducer 542 are fixedly mounted on the frame 1, the flip shaft 543 can be rotatably mounted on the frame 1, the power output shaft of the flip servo motor 541 is transmission-connected with the power input shaft of the reducer 542, the power output shaft of the reducer 542 is transmission-connected with one end of the flip shaft 543, the flip bracket 544 is fixedly mounted on the flip shaft 543, The head rack support shaft 545 is rotatably mounted on the flip bracket 544, the tip rack support shaft 545 and the flip shaft 543 are parallel to each other, the tip rack 52 is mounted on the tip rack support shaft 545 (when the tip rack 52 includes a frame body 522 and a tip mounting plate lifting mechanism, the frame body 522 of the tip rack is mounted on the tip rack support shaft 545), the driving pulley 546 is fixedly mounted on the flip shaft 543, and the driven pulley 548 is fixedly mounted on the tip rack support shaft 545, the driving pulley 546 is connected to the driven pulley 548 through a transmission belt 547, and the transmission ratio of the driving pulley 546 to the driven pulley 548 is 1. When the flip servo motor 541 is running, the flip shaft 543 is driven to rotate through the reducer 542, and the flip bracket 544 rotates around the flip shaft 543, switching the position of the suction head rack support shaft 545 and the suction head rack 52; at the same time, the active pulley 546 rotates with the flip shaft 543, and drives the driven pulley 548 and the suction head rack support shaft 545 to rotate relative to the flip bracket 544 through the transmission belt 547, so that the suction head rack 52 and each suction head 531 maintain the original posture (for example, always keep the suction cup 5315 in the downward posture).

[0082] like Figure 6-Figure 11 As shown, the aluminum film wrapping mechanism 6 includes a support frame 62, a connecting rod seat 63, a plurality of first connecting rods 64, a plurality of sliders 65 and a plurality of aluminum film edge folding components 66. The support frame 62 is provided with a connecting rod seat lifting mechanism capable of driving the connecting rod seat 63 to rise and fall; the support frame 62 is provided with a mounting base plate 67, the mounting base plate 67 is provided with a plurality of guide grooves 68 extending from the outside to the inside, the number of the guide grooves 68 is the same as that of the sliders 65 and they correspond one to one, the sliders 65 are installed in the guide grooves 68 and can slide along the guide grooves 68, the number of the sliders 65 is the same as that of the aluminum film edge folding components 66 and they correspond one to one, the aluminum film edge folding components 66 are located below the mounting base plate 67 and are connected to the corresponding sliders 65; the number of the sliders 65 is the same as that of the first connecting rods 64 and they correspond one to one, the sliders 65 are hinged to the first ends of the corresponding first connecting rods 64, and the second ends of each first connecting rod 64 are hinged to the connecting rod seat 63. The aluminum film wrapping mechanism 6 also includes a support frame lifting mechanism capable of driving the support frame 62 to rise and fall, and the support frame lifting mechanism is installed on the frame 1. Figure 6The aluminum film wrapping mechanism 6 shown includes three aluminum film wrapping units composed of a connecting rod seat 63, a plurality of first connecting rods 64, a plurality of sliders 65, a plurality of aluminum film edge folding components 66, a mounting base 67, a guide groove 68, etc. The three aluminum film wrapping units are installed on the same support frame 62, and are lifted and lowered together under the control of the support frame lifting mechanism, and can wrap three lunch boxes with aluminum film at the same time. The lunch box sealing machine of this embodiment is provided with two aluminum film wrapping mechanisms 6 arranged side by side in front and back (correspondingly, two box support mechanisms 7 are also provided), and the lunch boxes in the odd-numbered columns and the lunch boxes in the even-numbered columns on the template 22 are wrapped with aluminum film respectively, so that the lunch box sealing machine can wrap six lunch boxes with aluminum film at the same time.

[0083] refer to Figure 6 The support frame lifting mechanism includes a support frame lifting cylinder 69, which is installed on the frame 1. The piston rod of the support frame lifting cylinder 69 faces downward and is connected to the support frame 62.

[0084] The connecting rod seat lifting mechanism comprises a connecting rod seat lifting cylinder 610 , which is mounted on the support frame 62 , and a piston rod of the connecting rod seat lifting cylinder 610 faces downward and is connected to the connecting rod seat 63 .

[0085] The number of the aluminum film edge folding parts 66 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 66 are provided; each aluminum film edge folding part 66 corresponds to each corner of the top opening of the lunch box. Accordingly, four first connecting rods 64 and four sliders 65 are provided respectively.

[0086] In this embodiment, the connecting rod seat 63 is located directly above the center of the mounting base plate 67 .

[0087] In this embodiment, a positioning groove 671 capable of accommodating the top of the lunch box is provided on the lower surface of the central portion of the mounting base plate 67 , and each aluminum film edge folding component 66 is located around the positioning groove 671 .

[0088] In this embodiment, a top opening 681 is provided at the top of the guide groove 68, and the groove bottom 682 of the guide groove 68 supports the slider 65; a slider limiting mechanism is provided at a position corresponding to each guide groove 68 on the upper surface of the mounting base plate 67; the slider limiting mechanism includes a strip limiting block 611, which is located on the upper side of the guide groove 68 (the strip limiting block 611 is located on the upper side of the middle part of the guide groove 68) and spans the guide groove 68. The slider limiting mechanism also includes two second compression springs 612 and two guide columns 613. The two guide columns 613 are respectively located on both sides of the guide groove 68. The strip limiting block 611 is provided with two guide holes 614. The two guide holes 614 are respectively located at both ends of the strip limiting block 611. The two guide columns 613 are respectively located in the two guide holes 614. The two second compression springs 612 are respectively sleeved on the two guide columns 613. The top of the guide column 613 is provided with a spring limiting block 615. The lower end and the upper end of the second compression spring 612 are respectively in close contact with the strip limiting block 611 and the spring limiting block 615. The two second compression springs 612 apply a downward force to the strip limiting block 611, so that the lower surface of the strip limiting block 611 can contact the upper surface of the slider 65, and can prevent the slider 65 from detaching from the top opening 681 of the guide groove 68. In addition, the two second compression springs 612 also play a buffering role.

[0089] In this embodiment, there is a gap 616 between the upper surface of the aluminum film edge folding component 66 and the lower surface of the mounting base 67; the inner end of the guide groove 68 has a slider limiting inner wall 683. The inner edge of the upper surface of the aluminum film edge folding component 66 is provided with an aluminum film pressing convex edge 661.

[0090] In this embodiment, the slider 65 is a strip-shaped slider, the outer end of the strip-shaped slider 65 is connected to the outer edge of the corresponding aluminum film edge folding component 66 through a connecting column 617, the inner end of the strip-shaped slider 65 is hinged to the first end of the corresponding first connecting rod 64, and the bottom of the guide groove 68 is provided with a strip-shaped guide through hole 618 for the connecting column 617 to pass through. The connecting column 617 is in the strip-shaped guide through hole 618, and when the strip-shaped slider 65 moves along the guide groove 68, the connecting column 617 moves along the strip-shaped guide through hole 618. The outer end of the guide groove 68 has a first outer end opening 684, and the outer end of the strip guide through hole 618 has a second outer end opening 6181. During assembly, the strip slider 65 can be inserted into the guide groove 68 through the first outer end opening 684, and the connecting column 617 can be inserted into the strip guide through hole 618 through the second outer end opening 6181, which is more convenient for assembly; when the strip slider 65 moves outward along the guide groove 68, the outer end of the strip slider 65 can extend from the first outer end opening 684, and a part of the connecting column 617 can also extend from the second outer end opening 6181.

[0091] The support frame 62 is provided with at least one (such as two) guide columns 619 extending up and down (the lower end of the guide columns 619 is connected to the mounting base plate 67), and the connecting rod seat 63 is provided with at least one (such as two) first guide sleeves 620. The number of the first guide sleeves 620 and the guide columns 619 are the same and correspond one to one. The first guide sleeves 620 are sleeved on the guide columns 619 and can be raised and lowered along the guide columns 619.

[0092] refer to Fig.18 In this embodiment, the box support plate lifting mechanism 72 includes a second servo motor 721, a horizontal rotating shaft 722, a crank 723, a second connecting rod 724, a lifting rod 725 and a second guide sleeve 726. The second servo motor 721 and the second guide sleeve 726 are both installed on the frame 1. The horizontal rotating shaft 722 is rotatably installed on the frame 1 along the horizontal direction. The lifting rod 725 is in the second guide sleeve 726 and can be lifted and lowered relative to the second guide sleeve 726. The power output shaft of the second servo motor 721 is transmission-connected to the horizontal rotating shaft 722. The first end of the crank 723 is fixedly connected to the horizontal rotating shaft 722. The second end of the crank 723 is hinged to the lower end of the second connecting rod 724. The upper end of the second connecting rod 724 is hinged to the lower end of the lifting rod 725. The upper end of the lifting rod 725 is connected to the box support plate 71. When the second servo motor 721 is running, its power output shaft drives the horizontal shaft 722 to rotate forward or reverse, and the horizontal shaft 722 drives the crank 723 to swing back and forth around the horizontal shaft 722 at a certain angle; the crank 723 drives the lifting rod 725 and the box support plate 71 to move up and down a certain distance along the second guide sleeve 726 through the second connecting rod 724. The second servo motor can be connected to the horizontal shaft through a reducer.

[0093] The above-mentioned lunch box conveying device 2, lunch box adding device 3, and lunch box withdrawing device 8 can all adopt existing technologies and will not be described in detail here.

[0094] The following is a brief description of the working principle of this lunch box sealing machine:

[0095] 1. Working principle of the whole machine

[0096] In the previous process, the food filling machine puts the food into the lunch box, and transports the lunch box with the food to the position corresponding to the lunch box adding device 3. When the lunch box sealing machine is working, the lunch box adding device 3 puts the lunch box 01 into the lunch box placement hole 23 corresponding to its position on the lunch box conveying device 2, and the lunch box top opening 012 faces upward; then, the lunch box conveying device 2 conveys the lunch box to the position corresponding to the aluminum film suction and release mechanism 5, and the aluminum film suction and release mechanism 5 absorbs the aluminum film from the film storage mechanism 4 and places the aluminum film on the lunch box top opening 012; then, the lunch box conveying device 2 conveys the lunch box with the aluminum film stacked to the aluminum film wrapping mechanism 6, at which time the box support plate lifting mechanism 72 in the box support mechanism 7 drives the box support plate 71 to rise, lifts the lunch box 01 in the lunch box placement hole 23, and then the aluminum film wrapping mechanism 6 wraps the aluminum film around the lunch box top opening 012; finally, the lunch box withdrawal device 8 withdraws the lunch box wrapped with aluminum film from the lunch box conveying device 2.

[0097] 2. Working Principle of Film Storage Mechanism 4

[0098] In the initial state, the film pushing base plate 42 is at the bottom of the cavity of the film placing seat 41. At this time, a stack of aluminum films can be added to the film pushing base plate 42, and the aluminum films are in the aluminum film cavities 47; when working, the first servo motor 44 drives the first lifting seat 43, each film pushing base plate 42 and the aluminum films in each aluminum film cavities 47 to rise together. When the edge of the top aluminum film contacts the aluminum film stopper 461 of each stop metal elastic sheet 46, the stack of aluminum films is blocked by the aluminum film stopper 461 of each stop metal elastic sheet, so that the load of the first servo motor 44 exceeds the set output torque and pauses; after the aluminum film suction and release mechanism 5 sucks the top aluminum film from the film taking port of the film placing seat 41 (when the aluminum film suction and release mechanism sucks the top aluminum film, the edge of the aluminum film The aluminum film on the upper side becomes the new uppermost aluminum film; when the edge of the new uppermost aluminum film contacts the aluminum film stopper 461 of the stopping metal elastic sheet, it is blocked by the aluminum film stopper 461 of the stopping metal elastic sheet, causing the first servo motor 44 to pause again; and in this way, each aluminum film in each stack of aluminum films is lifted one by one to the film taking port 45 of the film placing seat 41, thereby realizing a continuous supply of aluminum film for the aluminum film suction and placing mechanism 5 to take.

[0099] When it is necessary to add aluminum film, the first servo motor 44 drives the first lifting seat 43 and each film pushing bottom plate 42 to descend and return to the initial state.

[0100] 3. Working principle of aluminum film suction and release mechanism 5

[0101] When the aluminum film is sucked and released, the suction head rack position switching mechanism drives the suction head rack 52 and each suction head 531 to move to the top of the film storage mechanism 4 (the film storage mechanism 4 has six film storage units, which correspond to the six suction head groups 53 one by one), and then the suction head mounting plate lifting cylinder 523 drives the suction head mounting plate 521 and each suction head 531 to descend, so that the suction cup 5315 of each suction head 531 contacts the upper surface of the aluminum film, the cavity of the suction cup 5315 is evacuated, the suction cup wall is deformed and closely attached to the aluminum film, and the aluminum film is sucked; then the suction head mounting plate is lifted by the suction head mounting plate lifting cylinder 523, and the suction head mounting plate is lifted by the suction head mounting plate lifting cylinder 523. The lowering cylinder 523 drives the suction head mounting plate 531 and each suction head 531 to rise, and takes out the aluminum film from the film storage mechanism 4; then the suction head rack position switching mechanism 54 drives the suction head rack 52, each suction head 531 and the aluminum film to move together to just above the lunch box; then the suction head mounting plate lifting cylinder 523 drives the suction head mounting plate 521, each suction head 531 and the aluminum film to descend, and then the vacuum suction of the suction cup 5315 on the aluminum film is released, and the aluminum film is superimposed on the opening at the top of the lunch box, thereby completing a round of suction, transfer, and placement of the aluminum film.

[0102] In the suction head 531, the lower end of the first compression spring 5312 exerts a downward force on the suction cup seat 5314, so that the suction cup seat 5314 has a tendency to move downward. In the initial state, due to the action of the first compression spring 5312, the upper limit component 5313 is in close contact with the upper surface of the suction head mounting plate 521, preventing the suction cup 5315 from moving further downward. The first compression spring 5312 plays a buffering role. When the aluminum film is sucked from the film storage mechanism 4, if different parts of the aluminum film are at different heights, the suction cups 5315 and the bottoms of the suction cup seats 5314 of some suction heads 531 will first contact the higher parts of the aluminum film. After the suction head mounting plate 521 continues to descend, the suction cups 5315 and the suction cup seats 5314 of these suction heads 531 will no longer descend due to obstruction, causing the first compression spring 5312 to shrink slightly, thereby not hindering the suction cups 5315 of other suction heads 531 from descending and adsorbing the lower parts of the aluminum film, thereby allowing the suction cups 5315 of each suction head 531 in the same suction head group 53 to be able to adsorb the aluminum film, so that the suction head group 53 can reliably adsorb the aluminum film.

[0103] 4. Working principle of aluminum film wrapping mechanism 6

[0104] refer to Figure 6 , Fig. 9 , Fig.10 and Fig.11 When the aluminum film wrapping mechanism 6 is in the initial state, the inner edges of the aluminum film edges and the folding parts 66 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 671); refer to Figure 6When the lunch box 01 covered with aluminum film reaches the aluminum film wrapping mechanism, the lunch box 01 can be lifted by the box supporting mechanism 7 so that the outer flange 011 of the lunch box is higher than the lunch box conveying device 2; then the support frame lifting cylinder 69 drives the support frame 62 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 66, and at the same time, the outer flange 011 at the top of the lunch box 01 is in the positioning groove 671, which positions the lunch box 01 and can avoid the misalignment of the lunch box 01 in the subsequent further film folding operation.

[0105] In the initial state, the slider 65 is located near the outer end of the guide groove 68, and the bottom 682 of the guide groove 68 supports the slider 65. At this time, there is a gap 616 between the upper surface of the aluminum film edge folding part 66 and the lower surface of the mounting base 67. The two second compression springs 612 exert a downward force on the strip stopper 611, so that the lower surface of the strip stopper 611 can contact the upper surface of the slider 65.

[0106] refer to Fig.12 and Fig.13 Then, the connecting rod seat lifting cylinder 610 drives the connecting rod seat 63 to rise, and the second end of each first connecting rod 64 rises accordingly, and the first end of each first connecting rod 64 drives each slider 65 to move inward along each guide groove 68. At this time, each aluminum film edge folding component 66 moves inward, 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.

[0107] During the process of folding the edge of the aluminum film inward, due to the downward pressure of the strip-shaped limit block 611 , the slider 65 will not move upward, and the slider 65 and the aluminum film edge folding component 66 move inward along the guide groove 68 .

[0108] refer to Figures 14 to 17 When the inner end of the slider 65 contacts the slider limit inner wall 683 of the inner end of the guide groove 68, the slider 65 cannot move inward any further. At this time, the connecting rod seat lifting cylinder 610 drives the connecting rod seat 63 to continue to rise, and the first end of each first connecting rod 64 drives each slider 65 to rise (at this time, the slider 65 pushes the strip limit block 611 upward, and the two second compression springs 612 are compressed; a gap appears between the slider 65 and the groove bottom 682 of the guide groove 68), and each aluminum film edge folding component 66 As it rises (at this time, the gap 616 between the upper surface of the aluminum film edge folding component 66 and the lower surface of the mounting base 67 becomes smaller), 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 66 rises, the aluminum film pressing convex edge 661 presses the edge portion of the aluminum film overlapped on the lower side of the outer flange 011 of the lunch box upward), making it 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.

[0109] In other embodiments, the tip rack position switching mechanism may also include a lifting mechanism, a second lifting seat, a translation mechanism and a translation seat, the lifting mechanism is installed on the frame and can drive the second lifting seat to lift and lower, the translation mechanism is installed on the second lifting seat and can drive the translation seat to translate, and the tip rack is installed on the translation seat (in the case where the tip rack includes a frame body and a tip mounting plate lifting mechanism, the frame body of the tip rack is installed on the translation seat). Alternatively, the tip rack position switching mechanism includes a translation mechanism, a translation seat, a lifting mechanism and a second lifting seat, the translation mechanism is installed on the frame and can drive the translation seat to translate, the lifting mechanism is installed on the translation seat and can drive the second lifting seat to lift and lower, and the tip rack is installed on the second lifting seat (in the case where the tip rack includes a frame body and a tip mounting plate lifting mechanism, the frame body of the tip rack is installed on the second lifting seat).

[0110] 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).

[0111] 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).

[0112] In other embodiments, the box tray lifting mechanism may also include a box tray lifting cylinder, the cylinder body of the box tray lifting cylinder is installed on the frame, and the piston rod of the box tray lifting cylinder faces upward and is connected to the box tray.

Claims

1. A lunch box sealing machine, comprising a frame, a lunch box conveying device, a lunch box adding device and a lunch box withdrawing device, wherein the lunch box conveying device, the lunch box adding device and the lunch box withdrawing device are all mounted on the frame, characterized in that: The lunch box sealing machine also includes a film storage mechanism, an aluminum film suction and release mechanism, an aluminum film wrapping mechanism and a box supporting mechanism, which are all installed on a frame; a lunch box adding device, an aluminum film suction and release mechanism, an aluminum film wrapping mechanism and a lunch box withdrawing device are arranged in sequence from front to back along the conveying direction of the lunch box conveying device, the film storage mechanism is arranged on one side of the aluminum film suction and release mechanism, and the box supporting mechanism is located below the aluminum film wrapping mechanism; the lunch box conveying device includes an annular template belt, which includes a plurality of templates arranged in sequence along its length direction, and at least one lunch box placement hole is provided on the template; The box supporting mechanism comprises a box supporting plate and a box supporting plate lifting mechanism capable of driving the box supporting plate to rise and fall; The aluminum film wrapping mechanism includes a support frame, a connecting rod seat, a plurality of first connecting rods, a plurality of sliders and a plurality of aluminum film edge folding components. 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 the outside to the 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 components and they correspond one to one, the aluminum film edge folding components 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 first connecting rods and they correspond one to one, the sliders are hinged to the first ends of the corresponding first connecting rods, and the second ends of the first connecting rods are hinged to the connecting rod seats; 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 at a position corresponding to each guide groove on the upper surface of the mounting base plate; 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 slider limiting mechanism also includes two second 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 second 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 second compression spring are respectively in close contact with the strip limiting block and the spring limiting block.

2. The lunch box sealing machine according to claim 1, characterized in that: The film storage mechanism comprises a film placing seat, a film pushing bottom plate, a first lifting seat, a first servo motor and a first lifting transmission mechanism; the film placing seat is fixedly mounted on the frame, and the film pushing bottom plate is mounted on the first lifting seat; the film placing seat has a cavity, and the top of the cavity of the film placing seat has a film taking port, and the top of the film placing seat is provided with a plurality of stop metal elastic sheets, a part of the stop metal elastic sheet extends into the film taking port, and the part of the stop metal elastic sheet extending into the film taking port constitutes an aluminum film stopper, the film pushing bottom plate is in the cavity of the film placing seat, and the side wall of the film placing seat and the upper surface of the film pushing bottom plate together form an aluminum film cavity capable of storing aluminum film; The power output shaft of the first servo motor is transmission-connected to the power input end of the first lifting transmission mechanism, the power output end of the first lifting transmission mechanism is connected to the first lifting seat, and the first servo motor drives the first lifting seat and the film pushing bottom plate to rise and fall through the first lifting transmission mechanism.

3. The lunch box sealing machine according to claim 2, characterized in that: The first lifting transmission mechanism includes a first housing, a first power input shaft, a first transmission gear set, a first power output shaft, a first lifting screw and a first nut. The first transmission gear set is installed in the first housing, the first power input shaft is rotatably installed on the first housing in a horizontal direction, the first power output shaft is rotatably installed on the first housing in a vertical direction, the first-stage gear of the first transmission gear set is installed on the first power input shaft, the final-stage gear of the first transmission gear set is installed on the first power output shaft, the lower end of the first lifting screw is connected to the upper end of the first power output shaft through a first coupling; the first nut is screwed with the first lifting screw, the first nut constitutes the power output end of the first lifting transmission mechanism, and the first nut is installed on the first lifting seat.

4. The lunch box sealing machine according to claim 1, characterized in that: The aluminum film suction and release mechanism includes a tip rack and a tip rack position switching mechanism capable of switching the position of the tip rack, and the tip rack position switching mechanism is installed on the frame; the tip rack includes a tip mounting plate, and at least one tip group is provided on the tip mounting plate, and in the at least one tip group, one or more tip groups include multiple tips; the tip mounting plate is provided with multiple first guide through holes running up and down, and the first guide through holes are the same as the total number of the tips and correspond one to one; the tip includes a lifting guide column, a first compression spring, an upper limit component, a suction cup seat and a suction cup, the lifting guide column is in the corresponding first guide through hole, the suction cup seat is installed at the lower end of the lifting guide column, the suction cup is installed on the suction cup seat, the first compression spring is sleeved on the lifting guide column, the lower end of the first compression spring can apply a downward force to the suction cup seat, and the upper limit component is installed at the upper end of the lifting guide column and contacts and cooperates with the upper surface of the tip mounting plate.

5. The lunch box sealing machine according to claim 4, characterized in that: The suction head rack also includes a rack body and a suction head mounting plate lifting mechanism capable of driving the suction head mounting plate to lift and lower, and the suction head mounting plate lifting mechanism is installed on the rack body.

6. The lunch box sealing machine according to claim 4 or 5, characterized in that: The position switching mechanism of the suction head rack comprises a flip servo motor, a reducer, a flip shaft, a flip bracket, a suction head rack support shaft, a driving pulley, a transmission belt and a driven pulley; the flip servo motor and the reducer are fixedly mounted on the frame, the flip shaft is rotatably mounted on the frame, the power output shaft of the flip servo motor is transmission-connected with the power input shaft of the reducer, the power output shaft of the reducer is transmission-connected with one end of the flip shaft, the flip bracket is fixedly mounted on the flip shaft, the suction head rack support shaft is rotatably mounted on the flip bracket, the suction head rack support shaft and the flip shaft are parallel to each other, the suction head rack is mounted on the suction head rack support shaft, the driving pulley is fixedly mounted on the flip shaft, the driven pulley is fixedly mounted on the suction head rack support shaft, the driving pulley is transmission-connected with the driven pulley through the transmission belt, and the transmission ratio of the driving pulley to the driven pulley is 1; Alternatively, the tip rack position switching mechanism comprises a lifting mechanism, a second lifting seat, a translation mechanism and a translation seat, the lifting mechanism is mounted on the frame and can drive the second lifting seat to lift, the translation mechanism is mounted on the second lifting seat and can drive the translation seat to translate, and the tip rack is mounted on the translation seat; Alternatively, the tip rack position switching mechanism includes a translation mechanism, a translation seat, a lifting mechanism and a second lifting seat, the translation mechanism is installed on the frame and can drive the translation seat to translate, the lifting mechanism is installed on the translation seat and can drive the second lifting seat to rise and fall, and the tip rack is installed on the second lifting seat.

7. The lunch box sealing machine according to claim 1, 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.

8. The lunch box sealing machine according to claim 1 or 7, 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.

9. The lunch box sealing machine according to claim 1 or 7, 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.

10. The lunch box sealing machine according to claim 1, characterized in that: The box support plate lifting mechanism includes a second servo motor, a horizontal rotating shaft, a crank, a connecting rod, a lifting rod and a second guide sleeve. The second servo motor and the second guide sleeve are both mounted on the frame. The horizontal rotating shaft is rotatably mounted on the frame in the horizontal direction. The lifting rod is in the second guide sleeve and can be lifted and lowered relative to the second guide sleeve. The power output shaft of the second servo motor is transmission-connected to the horizontal rotating shaft. The first end of the crank is fixedly connected to the horizontal rotating shaft. The second end of the crank is hinged to the lower end of the connecting rod. The upper end of the connecting rod is hinged to the lower end of the lifting rod. The upper end of the lifting rod is connected to the box support plate. Alternatively, the box-carrying plate lifting mechanism comprises a box-carrying plate lifting cylinder, a cylinder body of the box-carrying plate lifting cylinder is mounted on the frame, and a piston rod of the box-carrying plate lifting cylinder faces upward and is connected to the box-carrying plate.

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