Packaging machine for paper meal box production

Abstract

The invention belongs to the technical field of paper meal box packaging, and particularly relates to a packaging machine for paper meal box production, which comprises a rack, the upper end of the rack is fixedly connected with a packaging platform, and the packaging platform is provided with a conveying assembly and a guide assembly; the conveying assembly comprises two conveying rollers synchronously and rotationally connected to the packaging platform and a conveying belt arranged between the two conveying rollers in a sleeving mode. The guiding assembly comprises an inclined guiding plate fixedly connected to the upper end of the packaging platform. And the top sealing mechanism is used for pressing two top sealing plates at the top of the packaging box. According to the top sealing device, the top sealing mechanism is arranged, in the paper meal box packaging process, a packaging box is continuously conveyed through a conveying assembly and a guiding assembly, when the packaging box is conveyed to the position right opposite to two supporting side plates, two top sealing plates at the top of the packaging box are pressed and folded through a pressing roller, and top sealing operation on the packaging box is automatically achieved; manual operation of workers is not needed, the automation degree is high, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of paper food box packaging, and in particular relates to a packaging machine for producing paper food boxes. Background Art

[0002] A paper food box is a food packaging container made of paper materials, commonly used in places such as takeaways, fast food restaurants, and cafes to hold food, especially hot food, snacks, and single - serving meals. It is usually designed in a foldable and sealable form, with functions such as oil - proof, waterproof, and heat - preservation, which can effectively protect food and ensure food safety and hygiene. During the production and transportation of paper food boxes, they are prone to deformation, bending, damage, or contamination. Therefore, in order to protect paper food boxes from damage in the external environment and during transportation and ensure that the products are intact before being delivered to consumers, it is necessary to package the paper food boxes to effectively protect them.

[0003] However, during the packaging process of existing paper food boxes, the following technical problems often exist: During the process of packaging paper food boxes, after the paper food box is conveyed into the packaging box, it often requires workers to manually press and combine two sealing top plates at the top of the packaging box, and then apply glue to the gap between the two sealing top plates. This not only has cumbersome operations and low work efficiency, but also cannot ensure that the two sealing top plates can be just pressed into a horizontal fitting state. Furthermore, it cannot ensure the sealing effect of the packaging box after gluing, resulting in the packaging box still being easily contaminated by the outside world (such as water stains seeping in), reducing the product quality of the paper food box inside the packaging box. During the packaging process, it is impossible to dynamically adjust the amount of glue coating according to the humidity of the working environment. When the humidity of the working environment is high, if the original amount of glue coating is maintained, excessive moisture in the air will interact with the solvent in the glue, slowing down the evaporation of the glue, resulting in the glue not drying quickly. As a result, the packaging boxes will stick together during subsequent stacking and transportation, making the transportation of the packaging boxes inconvenient. When the humidity of the working environment is low, if the original amount of glue coating is maintained, the solvent in the glue will evaporate too quickly, resulting in the glue drying too fast, causing the packaging boxes to be poorly bonded and affecting the sealing performance of the packaging boxes. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems raised in the above - mentioned background art, and provide a packaging machine for producing paper food boxes that can press and close two sealing top plates at the top of the packaging box through a pressing roller, automatically realizing the capping operation of the packaging box without manual operation by workers.

[0005] To achieve the above - mentioned purpose, the present invention adopts the following technical solutions: A packaging machine for producing paper food boxes, comprising: A frame, with a packaging platform fixedly connected to the upper end of the frame. A conveying component and a guiding component are provided on the packaging platform. The conveying component includes two conveying rollers synchronously and rotatably connected to the packaging platform and a conveying belt sleeved between the two conveying rollers. The guiding component includes an inclined guiding plate fixedly connected to the upper end of the packaging platform; A capping mechanism for pressing two top cover plates of a packaging box together. The capping mechanism includes two symmetrically arranged supporting side plates fixedly connected to the upper end of the packaging platform. A driving shaft is rotatably connected to the side wall of the supporting side plate. An abutting plate is fixedly connected to the driving shaft. A guiding track is fixedly connected to the side wall of the supporting side plate through an L-shaped rod. A moving rod is slidably installed in the guiding track. The moving rod abuts against the upper wall of the abutting plate. A pressing roller is rotatably connected to a part of the moving rod close to the middle position of the conveying component. A driving component is provided between the two driving shafts for driving the two driving shafts to always rotate in opposite directions; The guiding track is divided into an arc section and a straight section; A flattening mechanism for pressing the two top cover plates into a horizontally fitting state to improve the subsequent sealing effect of the packaging box.

[0006] Preferably, the driving component includes a driving gear fixedly connected to the driving shaft. An electric telescopic rod is fixedly connected to the upper side of the packaging platform close to the supporting side plate through a fixed column. A lifting plate is fixedly connected to the output end of the electric telescopic rod. Rack bars are fixedly connected to both ends of the lifting plate. The rack bars are meshed with the driving gears at corresponding positions.

[0007] Preferably, the flattening mechanism includes a first conductive sheet fixedly connected to the upper end of the abutting plate. A second conductive sheet is fixedly connected to the side wall of the supporting side plate through a first support rod. An electromagnetic ring is fixedly connected to a part of the moving rod located in the guiding track. A first magnetic block is fixedly connected to the inner wall of the straight section far from the arc section. The electromagnetic ring is connected in series with an external power supply through the first conductive sheet and the second conductive sheet. When the electromagnetic ring is energized, it attracts the first magnetic block with opposite poles.

[0008] Preferably, an installation plate is fixedly connected to the side wall of the supporting side plate. A winding roller is rotatably connected to the side wall of the installation plate. A fixed sleeve is fixedly connected to the side wall of the installation plate. A torsion spring is provided between the roller shaft of the winding roller and the inner wall of the fixed sleeve. A traction rope is wound around the winding roller. The traction rope extends into the guiding track and is fixedly connected to the moving rod.

[0009] Preferably, an adjustable glue coating mechanism is further provided at the upper end of the packaging platform. The adjustable glue coating mechanism includes a support plate fixedly connected to the upper end of the packaging platform. A rotating rod is rotatably connected to the lower end of the support plate. A servo motor for driving the rotating rod to perform periodic forward and reverse rotations is provided at the upper end of the support plate. A second magnetic block is fixedly connected to the rotating rod. A turntable is fixedly connected to the periphery of the second magnetic block. Two sliding grooves are symmetrically formed in the turntable. Both sides of the second magnetic block extend into the two sliding grooves respectively. A moving block is slidably connected in the sliding groove. A fixed shaft is fixedly connected to the upper end of the moving block. A sleeve is rotatably sleeved on the fixed shaft. A connecting rod is fixedly connected to the sleeve. Extraction boxes are symmetrically arranged on both sides of the turntable. A piston block is hermetically slidably connected to the inner wall of the extraction box. A storage box and a discharge box are communicated with the extraction box. A push plate is fixedly connected to one side of the piston block. The push plate extends outside the extraction box and a transmission shaft is fixedly connected to the top end thereof. The connecting rod is rotatably connected to the transmission shaft. A control component for controlling the position of the moving block in the sliding groove is further provided on the support plate.

[0010] Preferably, the storage box and the discharge box are respectively fixedly connected to the side wall of the support plate through second support rods and third support rods. A three-way pipe is fixedly communicated with the upper end of the storage box. The three-way pipe is fixedly communicated with the two extraction boxes. A drain pipe is fixedly communicated between the discharge box and the two extraction boxes. First one-way valves are provided at the communication positions between the three-way pipe and the two extraction boxes and in the two drain pipes.

[0011] Preferably, the control component includes a humidity sensor and a PLC controller fixedly connected to the side wall of the support plate. An electromagnetic sheet is provided on one side of the moving block close to the second magnetic block. The magnetic poles on the side of the electromagnetic sheet corresponding to the second magnetic block attract each other with opposite polarities. A tension spring is provided between the side of the moving block far from the electromagnetic sheet and the inner wall of the sliding groove. The PLC controller adjusts the magnetic pole strength of the electromagnetic sheet according to the humidity data fed back by the humidity sensor.

[0012] Preferably, an exhaust mechanism is further provided at the position directly below the turntable. The exhaust mechanism includes an air extraction cylinder arranged directly below the turntable and coaxially with the turntable. The air extraction cylinder is fixedly connected to the side wall of the support plate through a fourth support rod. The rotating rod extends into the air extraction cylinder and is coaxially fixedly connected with a threaded rod. A piston plate is hermetically threadedly sleeved on the threaded rod. The piston plate is linearly slidably connected to the inner wall of the air extraction cylinder. Two air inlet nozzles are fixedly communicated with the inner bottom wall of the air extraction cylinder. A guide pipe is fixedly communicated with the lower end of the air extraction cylinder. The lower end of the guide pipe is fixedly communicated with an exhaust box. A plurality of exhaust nozzles are fixedly communicated with the lower end of the exhaust box. Second one-way valves are provided in the guide pipe and the two air inlet nozzles.

[0013] Compared with the existing technology, the advantages of the packaging machine for producing paper lunch boxes are as follows: In the present invention, by providing a capping mechanism, during the process of packaging paper food boxes, the packaging boxes are continuously conveyed by a conveying assembly and a guiding assembly. When the packaging box is conveyed to be directly opposite two supporting side plates, two driving shafts are driven by a driving assembly to rotate in opposite directions, and a pressing roller presses and folds two top sealing plates on the top of the packaging box, automatically realizing the capping operation of the packaging box without manual operation by workers, with a relatively high degree of automation and improved work efficiency.

[0014] In the present invention, by providing a flattening mechanism, when the abutting plate pushes the moving rod to move from the arc section to the straight section of the guiding track, the first conductive sheet on the abutting plate contacts the second conductive sheet, the electromagnetic ring is energized to generate magnetism, and under the action of the magnetic suction force between it and the first magnetic block, it approaches the first magnetic block, so that the two moving rods drive the two pressing rollers to approach each other horizontally, ensuring the horizontal fitting effect between the two top sealing plates on the top of the packaging box after capping, and further ensuring the sealing performance of the packaging box after gluing, improving the product quality of the paper food box in the packaging box.

[0015] In the present invention, by providing an adjustable glue application mechanism, after the two top sealing plates on the top of the packaging box are horizontally fitted, the humidity sensor can detect the humidity of the working environment, and then the PLC controller adjusts the magnetic pole strength of the two electromagnetic sheets according to the detected humidity data, and adjusts the position of the moving block in the sliding groove according to the different magnetic pole strengths of the electromagnetic sheets, so as to dynamically adjust the glue application amount of the glue according to the humidity of the working environment.

[0016] In the present invention, by providing an exhaust mechanism, during the process of pumping and discharging the glue for glue application operation, the piston plate is driven to perform reciprocating vertical displacement, reciprocally sucking external air through the air inlet nozzle and discharging it to the glue application position through the air guide pipe, the exhaust box and multiple exhaust nozzles, improving the drying speed of the glue. At the same time, the impact of the air flow on the glue can improve the uniformity of glue application, improving the sealing effect of the packaging box. Description of the Drawings

[0017] Figure 1 is the three-dimensional structural schematic diagram of the present invention; Figure 2 is the partial structural schematic diagram of the packaging platform in the present invention; Figure 3 is the partial structural schematic diagram of the capping mechanism in the present invention; Figure 4 is Figure 3 the enlarged view of part A in Figure 5 is the sectional structural schematic diagram of the guiding track in the present invention; Figure 6 is the partial structural schematic diagram of the adjustable glue application mechanism in the present invention; Figure 7 isFigure 6 Enlarged view at position B in the middle; Figure 8 It is a schematic cross-sectional structure diagram of the air extraction cylinder in the present invention.

[0018] In the figure: Frame; 11, Packaging platform; 12, Conveyor assembly; 13, Guide assembly; 131, Inclined guide plate; Capping mechanism; 21, Support side plate; 211, Mounting plate; 212, Winding roller; 213, Traction rope; 22, Driving shaft; 23, Contact plate; 24, Guide track; 241, Arc section; 242, Straight section; 25, Moving rod; 26, Pressing roller; 27, Driving assembly; 271, Driving gear; 272, Electric telescopic rod; 273, Lifting plate; 274, Rack; Flattening mechanism; 31, First conductive sheet; 32, Second conductive sheet; 33, Electromagnetic ring; 34, First magnetic block; Adjustable glue coating mechanism; 41, Support plate; 42, Rotating rod; 43, Servo motor; 44, Second magnetic block; 45, Turntable; 46, Chute; 47, Moving block; 48, Fixed shaft; 49, Sleeve; 410, Connecting rod; 411, Extraction box; 412, Piston block; 413, Storage box; 414, Discharge box; 415, Pushing plate; 416, Transmission shaft; 417, Control assembly; 4171, Humidity sensor; 4172, PLC controller; 4173, Tensile spring; 418, Three-way pipe; 419, Drain pipe; Exhaust mechanism; 51, Air extraction cylinder; 52, Threaded rod; 53, Piston plate; 54, Air inlet nozzle; 55, Air duct; 56, Exhaust box. Specific implementation manner

[0019] The following embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0020] Embodiment: Refer to Figures 1 to 8 , A packaging machine for producing paper lunch boxes, comprising: Frame 1, the upper end of the frame 1 is fixedly connected with a packaging platform 11, the packaging platform 11 is provided with a conveyor assembly 12 and a guide assembly 13, the conveyor assembly 12 includes two conveyor rollers synchronously and rotatably connected to the packaging platform 11 and a conveyor belt sleeved between the two conveyor rollers, and the guide assembly 13 includes an inclined guide plate 131 fixedly connected to the upper end of the packaging platform 11; Specifically, one end of each of the two conveying rollers extends outside the packaging platform 11 and is connected by a synchronous pulley and a synchronous belt to ensure that the two conveying rollers always rotate synchronously. A DC motor for driving one of the conveying rollers to rotate is provided on the outer wall of one side of the packaging platform 11, so that the conveying belt can be continuously fed to convey the packaging box placed above it. Before the conveying assembly 12 conveys the packaging box, the packaging box is conveyed onto the conveying belt through the inclined guide plate 131. The upper surface of the inclined guide plate 131 is smoothly arranged, so that the packaging box can always slide to the designated position on the conveying belt under the action of inertia force.

[0021] The capping mechanism 2 is used to press the two top cover plates on the top of the packaging box. The capping mechanism 2 includes two symmetrically arranged support side plates 21 fixedly connected to the upper end of the packaging platform 11. A driving shaft 22 is rotatably connected to the side wall of the support side plate 21. An abutting plate 23 is fixedly connected to the driving shaft 22. A guide track 24 is fixedly connected to the side wall of the support side plate 21 through an L-shaped rod. A moving rod 25 is slidably installed in the guide track 24. The moving rod 25 abuts against the upper wall of the abutting plate 23. A pressing roller 26 is rotatably connected to a part of the moving rod 25 close to the middle position of the conveying assembly 12. A driving assembly 27 is provided between the two driving shafts 22 for driving the two driving shafts 22 to always rotate in opposite directions. Specifically, the driving assembly 27 includes a driving gear 271 fixedly connected to the driving shaft 22. An electric telescopic rod 272 is fixedly connected to the upper end of one side of the packaging platform 11 close to the support side plate 21 through a fixed column. A lifting plate 273 is fixedly connected to the output end of the electric telescopic rod 272. Rack bars 274 are fixedly connected to both ends of the lifting plate 273. The rack bars 274 are meshed with the driving gears 271 at the corresponding positions. When the packaging box is conveyed to be directly opposite the two support side plates 21, the electric telescopic rod 272 drives the lifting plate 273 to move upward, and further drives the two driving shafts 22 to rotate in opposite directions through the rack bars 274 and the driving gears 271 on both sides.

[0022] The guide track 24 is divided into an arc section 241 and a straight section 242; In view of the problem that in the prior art, it is often necessary for workers to manually press and combine two sealing top plates on the top of the packaging box, and then apply glue to the gap between the two sealing top plates, the operation is cumbersome and the work efficiency is low. The present invention solves this problem by providing a capping mechanism 2. During the process of packaging the paper food box, the packaging box is continuously conveyed by a conveying component 12 and a guiding component 13. Before the packaging box is conveyed to be directly opposite to two supporting side plates 21, the paper food box is conveyed into the interior of the packaging box. When the packaging box is conveyed to be directly opposite to two supporting side plates 21, a driving component 27 can drive two driving shafts 22 to rotate in opposite directions. When the two driving shafts 22 rotate in opposite directions, two abutting plates 23 will be driven to rotate in opposite directions. The two abutting plates 23 push a moving rod 25 to perform a circular motion along an arc section 241 of a guiding track 24. During this process, the two sealing top plates on the top of the packaging box can be pressed and closed by a pressing roller 26, automatically realizing the capping operation of the packaging box without manual operation by workers, with a high degree of automation and improved work efficiency.

[0023] In addition, the moving rod 25 and the pressing roller 26 can also limit the position of the packaging box during the process of the packaging box falling on the conveying component 12, so that the packaging box is always directly opposite to the two supporting side plates 21, ensuring the accuracy of the glue application position.

[0024] A flattening mechanism 3 is used to press the two sealing top plates to a horizontally fitting state to improve the subsequent sealing effect of the packaging box. The flattening mechanism 3 includes a first conductive sheet 31 fixedly connected to the upper end of the abutting plate 23. A second conductive sheet 32 is fixedly connected to the side wall of the supporting side plate 21 through a first support rod. A part of the moving rod 25 located inside the guiding track 24 is fixedly connected with an electromagnetic ring 33. A first magnetic block 34 is fixedly connected to the inner wall of the straight section 242 far from the arc section 241. The electromagnetic ring 33 is connected in series with an external power supply through the first conductive sheet 31 and the second conductive sheet 32. When the electromagnetic ring 33 is energized, it attracts the first magnetic block 34 with opposite poles.

[0025] In view of the problem that in the prior art, it is impossible to ensure that the two sealing top plates can be just pressed to a horizontally fitting state, and thus the sealing effect of the packaging box after glue application cannot be ensured. The present invention solves this problem by providing a flattening mechanism 3. When the abutting plate 23 pushes the moving rod 25 to move from the arc section 241 of the guiding track 24 to the straight section 242, the first conductive sheet 31 on the abutting plate 23 contacts the second conductive sheet 32, the electromagnetic ring 33 is energized to generate magnetism, and under the action of the magnetic attraction force between it and the first magnetic block 34, it approaches the first magnetic block 34, so that the two moving rods 25 drive the two pressing rollers 26 to approach each other in the horizontal direction, ensuring the horizontal fitting effect between the two sealing top plates on the top of the packaging box after capping, and thus ensuring the sealing performance of the packaging box after glue application, and improving the product quality of the paper food box in the packaging box.

[0026] A mounting plate 211 is fixedly connected to the side wall of the supporting side plate 21. A winding roller 212 is rotatably connected to the side wall of the mounting plate 211. A fixed sleeve is fixedly connected to the side wall of the mounting plate 211. A torsion spring is provided between the roller shaft of the winding roller 212 and the inner wall of the fixed sleeve. A traction rope 213 is wound around the winding roller 212. The traction rope 213 extends into the guiding track 24 and is fixedly connected to the moving rod 25.

[0027] It is worth mentioning that after the packaging box is capped, the lifting plate 273 is driven by the electric telescopic rod 272 to slightly descend, so that the two drive shafts 22 rotate in opposite directions, and the first conductive sheet 31 on the abutting plate 23 no longer contacts the second conductive sheet 32. At this time, the electromagnetic ring 33 is powered off, and the winding roller 212 rotates under the elastic force of the torsion spring, and winds up the traction rope 213, so that the two pressing rollers 26 move away from each other, facilitating subsequent glue discharging and glue coating operations. After the glue coating is completed, the packaging box is continuously conveyed by the conveying assembly 12. At this time, the two pressing rollers 26 are above the packaging box and will not hinder the conveyance of the packaging box. When the packaging box completely leaves the position of the two supporting side plates 21, the lifting plate 273 is driven by the electric telescopic rod 272 to descend to the initial bottom position, so that the drive shaft 22 continues to rotate in the opposite direction, driving the abutting plate 23 to reset to the initial position, so that the winding roller 212 continues to rotate under the elastic force of the torsion spring, and resets the moving rod 25 and the pressing roller 26 to the initial position, facilitating capping and flattening of the next packaging box falling on the conveying assembly 12.

[0028] An adjustable glue coating mechanism 4 is further provided at the upper end of the packaging platform 11. The adjustable glue coating mechanism 4 includes a support plate 41 fixedly connected to the upper end of the packaging platform 11. A rotating rod 42 is rotatably connected to the lower end of the support plate 41. A servo motor 43 for driving the rotating rod 42 to perform periodic forward and reverse rotations is provided at the upper end of the support plate 41. A second magnetic block 44 is fixedly connected to the rotating rod 42. A turntable 45 is fixedly connected to the periphery of the second magnetic block 44. Two sliding grooves 46 are symmetrically formed in the turntable 45. The two sides of the second magnetic block 44 respectively extend into the two sliding grooves 46. A moving block 47 is slidably connected in the sliding groove 46. A fixed shaft 48 is fixedly connected to the upper end of the moving block 47. A sleeve 49 is rotatably sleeved on the fixed shaft 48. A connecting rod 410 is fixedly connected to the sleeve 49. Extraction boxes 411 are symmetrically arranged on both sides of the turntable 45. A piston block 412 is hermetically slidably connected to the inner wall of the extraction box 411. A storage box 413 and a discharge box 414 are communicated with the extraction box 411. A push plate 415 is fixedly connected to one side of the piston block 412. The push plate 415 extends outside the extraction box 411 and its top end is fixedly connected to a transmission shaft 416. The connecting rod 410 is rotatably connected to the transmission shaft 416. A control assembly 417 for controlling the position of the moving block 47 in the sliding groove 46 is further provided on the support plate 41.

[0029] Specifically, the storage box 413 and the discharge box 414 are respectively fixedly connected to the side wall of the support plate 41 through the second support rod and the third support rod. The upper end of the storage box 413 is fixedly communicated with a three-way pipe 418. The three-way pipe 418 is fixedly communicated with two extraction boxes 411. A liquid discharge pipe 419 is fixedly communicated between the discharge box 414 and the two extraction boxes 411. First one-way valves are provided at the communication points between the three-way pipe 418 and the two extraction boxes 411 and inside the two liquid discharge pipes 419. Through the setting of the first one-way valves, when the two piston blocks 412 move in the extraction boxes 411, the glue in the storage box 413 can only be pumped into the extraction boxes 411 through the three-way pipe 418, and the glue in the extraction boxes 411 can only be discharged through the liquid discharge pipe 419, ensuring the supply of glue and avoiding the influence on the glue coating work caused by the backflow of glue.

[0030] During the actual glue coating process, the servo motor 43 can drive the rotating rod 42 and the turntable 45 to periodically rotate forward and backward, and the rotation angle of its forward and backward rotation is less than 360°. It drives the moving block 47, the fixed shaft 48 and the sleeve 49 on it to periodically perform circular motions in opposite directions. When the moving block 47 rotates away from the extraction box 411, the piston block 412 will be driven by the connecting rod 410 and the push plate 415 to approach the turntable 45 in the extraction box 411. When the moving block 47 rotates close to the extraction box 411, the piston block 412 will be driven to move away from the turntable 45 in the extraction box, so that the glue continuously flows from the storage box 413 into the extraction box 411 and continuously flows from the extraction box 411 into the discharge box 414, realizing the glue discharging and glue coating work.

[0031] The control component 417 includes a humidity sensor 4171 and a PLC controller 4172 fixedly connected to the side wall of the support plate 41. An electromagnetic sheet is provided on the side of the moving block 47 close to the second magnet 44. The magnetic poles on the side of the electromagnetic sheet corresponding to the second magnet 44 attract each other with opposite polarities. A tension spring 4173 is provided between the side of the moving block 47 away from the electromagnetic sheet and the inner wall of the sliding groove 46. The PLC controller 4172 adjusts the magnetic pole strength of the electromagnetic sheet according to the humidity data fed back by the humidity sensor 4171.

[0032] Aiming at the problem in the prior art that the glue coating amount cannot be dynamically adjusted according to the humidity of the working environment, the present invention sets up an adjustable glue coating mechanism 4. After the two top sealing plates of the packaging box are horizontally fitted, during the continuous extraction of glue, the humidity sensor 4171 can detect the humidity of the working environment, and then the PLC controller 4172 adjusts the magnetic pole strengths of the two electromagnetic sheets according to the detected humidity data: When the humidity of the working environment is relatively high, the magnetic pole strength of the electromagnetic sheet is controlled to be relatively strong, so that the magnetic attraction force between the electromagnetic sheet and the second magnet 44 is relatively strong. As a result, the electromagnetic sheet and the moving block 47 are in a position relatively close to the center of the turntable 45 within the sliding groove 46 under the elastic force of the tension spring 4173. Thus, when the turntable 45 drives the moving block 47 to perform circular motion, the range of movement of the moving block 47 driving the piston block 412 through the fixed shaft 48, the sleeve 49, the connecting rod 410, and the push plate 415 is reduced, thereby reducing the amount of glue extracted, reducing the subsequent discharge amount and coating amount of the glue. When the humidity of the working environment is relatively high, the coating amount of the glue is correspondingly reduced to ensure the drying speed of the glue and avoid adhesion of the packaging boxes during subsequent stacking and transportation; When the humidity of the working environment is relatively low, the magnetic pole strength of the electromagnetic sheet is controlled to be relatively weak, so that the magnetic attraction force between the electromagnetic sheet and the second magnet 44 is relatively weak. As a result, the electromagnetic sheet and the moving block 47 are in a position relatively far from the center of the turntable 45 within the sliding groove 46, increasing the range of movement of the moving block 47 driving the piston block 412, thereby increasing the amount of glue extracted, increasing the subsequent discharge amount and coating amount of the glue. When the humidity of the working environment is relatively low, the coating amount of the glue is correspondingly increased to avoid excessive drying of the glue and ensure the bonding strength and sealing performance of the packaging boxes; Thus, the glue coating amount is dynamically adjusted according to the humidity of the working environment.

[0033] An exhaust mechanism 5 is also provided at the position directly below the turntable 45. The exhaust mechanism 5 includes an air extraction cylinder 51 disposed directly below the turntable 45 and coaxially with the turntable 45. The air extraction cylinder 51 is fixedly connected to the side wall of the support plate 41 through a fourth support rod. The rotating rod 42 extends into the air extraction cylinder 51 and is coaxially and fixedly connected with a threaded rod 52. A piston plate 53 is hermetically and threadedly sleeved on the threaded rod 52. The piston plate 53 is linearly slidably connected to the inner wall of the air extraction cylinder 51. Two air inlet nozzles 54 are fixedly communicated with the inner bottom wall of the air extraction cylinder 51. The lower end of the air extraction cylinder 51 is fixedly communicated with an air guide pipe 55. The lower end of the air guide pipe 55 is fixedly communicated with an exhaust box 56. A plurality of exhaust nozzles are fixedly communicated with the lower end of the exhaust box 56. Second one-way valves are provided in both the air guide pipe 55 and the two air inlet nozzles 54.

[0034] Specifically, the function of the second one-way valve here is similar to that of the first one-way valve, which is used to prevent air from flowing back and ensure the air suction effect, and will not be elaborated here too much.

[0035] It should also be noted that, by providing the exhaust mechanism 5, during the process of extracting and discharging the glue for glue application operations, the rotating rod 42 periodically rotates forward and backward, which will drive the threaded rod 52 to rotate forward and backward synchronously, thereby driving the piston plate 53 to perform reciprocating vertical displacement. The piston plate 53 reciprocally sucks external air through the air inlet nozzle 54, and discharges it to the glue application position through the air guide pipe 55, the exhaust box 56, and multiple exhaust nozzles, improving the drying speed of the glue. At the same time, the impact of the airflow on the glue can improve the uniformity of glue application, enhancing the sealing effect of the packaging box.

[0036] The functional principle of the present invention can be elaborated through the following operating methods: During the packaging process, first place the packaging box on the inclined guide plate 131 and let it freely slide onto the conveying assembly 12. Subsequently, convey the paper food box into the packaging box. Here, the paper food box can be placed by an additionally provided conveying assembly, such as a conveyor belt and a guide plate, which will not be elaborated in detail here; Drive the lifting plate 273 to move upward through the electric telescopic rod 272. Further, drive the two drive shafts 22 to rotate in opposite directions through the racks 274 and the drive gears 271 on both sides, driving the two abutting plates 23 to rotate in opposite directions. The two abutting plates 23 push the moving rod 25 to perform a circular motion along the arc section 241 of the guiding track 24, and press and fold the two sealing top plates at the top of the packaging box through the pressing roller 26; When the abutting plate 23 pushes the moving rod 25 to move from the arc section 241 to the straight section 242 of the guiding track 24, the first conductive sheet 31 on the abutting plate 23 contacts the second conductive sheet 32. The electromagnetic ring 33 is energized to generate magnetism, and under the action of the magnetic attraction force between it and the first magnetic block 34, it approaches the first magnetic block 34, so that the two moving rods 25 drive the two pressing rollers 26 to approach each other horizontally, ensuring the horizontal fitting effect between the two sealing top plates at the top of the packaging box after capping; Subsequently, the electric telescopic rod 272 drives the lifting plate 273 to slightly descend, causing the two drive shafts 22 to rotate in the reverse direction, so that the first conductive sheet 31 on the abutting plate 23 no longer contacts the second conductive sheet 32. At this time, the electromagnetic ring 33 is powered off, and the winding roller 212 rotates under the elastic force of the torsion spring and winds the traction rope 213, causing the two pressing rollers 26 to move away from each other and moving the pressing rollers 26 away from the glue application position; The servo motor 43 drives the rotating rod 42 and the turntable 45 to periodically rotate forward and backward, driving the moving block 47, the fixed shaft 48 and the sleeve 49 to periodically perform circular motions in opposite directions. When the moving block 47 rotates away from the extraction box 411, it will drive the piston block 412 to approach the turntable 45 in the extraction box 411 through the connecting rod 410 and the push plate 415. When the moving block 47 rotates close to the extraction box 411, it will drive the piston block 412 to move away from the turntable 45 in the extraction box, so that the glue continuously flows from the storage box 413 into the extraction box 411 and continuously flows from the extraction box 411 into the discharge box 414. The glue is discharged through the through holes opened at the bottom of the discharge box 414 to realize the glue application work; The humidity sensor 4171 detects the humidity of the working environment. Subsequently, the PLC controller 4172 adjusts the magnetic pole strength of the two electromagnetic sheets according to the detected humidity data, and adjusts the position of the moving block 47 in the chute 46 according to the different magnetic pole strengths of the electromagnetic sheets, so as to dynamically adjust the glue application amount according to the humidity of the working environment; After the glue application is completed, the conveying assembly 12 conveys the packaging box. At this time, the two pressing rollers 26 are above the packaging box and will not hinder the conveyance of the packaging box. When the packaging box completely leaves the position between the two supporting side plates 21, the electric telescopic rod 272 drives the lifting plate 273 to descend to the initial position at the bottom, resets the moving rod 25 and the pressing roller 26 to the initial position, and conveys the next packaging box to the inclined guide plate 131 to realize the subsequent packaging operation, with high automation and improved packaging efficiency.

[0037] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A packaging machine for producing paper lunch boxes, characterized in that: include: A frame (1), wherein the upper end of the frame (1) is fixedly connected to a packaging platform (11), and the packaging platform (11) is provided with a conveying assembly (12) and a guiding assembly (13), wherein the conveying assembly (12) comprises two conveying rollers synchronously rotatably connected to the packaging platform (11) and a conveying belt sleeved between the two conveying rollers, and the guiding assembly (13) comprises an inclined guiding plate (131) fixedly connected to the upper end of the packaging platform (11); A capping mechanism (2) is used for pressing two capping plates on the top of the packaging box, the capping mechanism (2) comprising two symmetrically arranged supporting side plates (21) fixedly connected to the upper end of the packaging platform (11), a driving shaft (22) being rotatably connected to the side wall of the supporting side plate (21), an abutment plate (23) being fixedly connected to the driving shaft (22), a guide rail (24) being fixedly connected to the side wall of the supporting side plate (21) via an L-shaped rod, a moving rod (25) being slidably mounted in the guide rail (24), the moving rod (25) abutting against the upper wall of the abutment plate (23), a portion of the moving rod (25) close to the middle position of the conveying assembly (12) being rotatably connected to a pressing roller (26), and a driving assembly (27) being provided between the two driving shafts (22) for driving the two driving shafts (22) to always rotate in opposite directions; The guide track (24) is divided into an arc section (241) and a straight section (242); The flattening mechanism (3) is used to press the two top sealing plates together to a horizontally fitted state so as to improve the sealing effect of the subsequent packaging box.

2. The paper lunch box packaging machine according to claim 1, characterized in that: The driving assembly (27) comprises a driving gear (271) fixedly connected to the driving shaft (22); an upper end of the packaging platform (11) close to the supporting side plate (21) is fixedly connected to an electric telescopic rod (272) via a fixing column; an output end of the electric telescopic rod (272) is fixedly connected to a lifting plate (273); both ends of the lifting plate (273) are fixedly connected to racks (274); the racks (274) are meshed with the driving gears (271) at corresponding positions.

3. The paper lunch box production packaging machine according to claim 1, characterized in that: The flattening mechanism (3) comprises a first conductive sheet (31) fixedly connected to the upper end of the abutment plate (23); a second conductive sheet (32) is fixedly connected to the side wall of the supporting side plate (21) via a first support rod; an electromagnetic ring (33) is fixedly connected to the portion of the moving rod (25) located in the guide track (24); a first magnetic block (34) is fixedly connected to the inner wall of the straight section (242) away from the arc section (241); the electromagnetic ring (33) is connected in series with an external power supply via the first conductive sheet (31) and the second conductive sheet (32); and when the electromagnetic ring (33) is energized, it attracts the first magnetic block (34) with opposite poles.

4. The paper lunch box production packaging machine according to claim 1, characterized in that: A mounting plate (211) is fixedly connected to the side wall of the supporting side plate (21), a winding roller (212) is rotatably connected to the side wall of the mounting plate (211), a fixing sleeve is fixedly connected to the side wall of the mounting plate (211), a torsion spring is provided between the roller shaft of the winding roller (212) and the inner wall of the fixing sleeve, a traction rope (213) is wound around the winding roller (212), and the traction rope (213) extends to the inside of the guide track (24) and is fixedly connected to the moving rod (25).

5. The paper lunch box production packaging machine according to claim 4, characterized in that: The upper end of the packaging platform (11) is also provided with an adjustable glue coating mechanism (4), the adjustable glue coating mechanism (4) comprising a support plate (41) fixedly connected to the upper end of the packaging platform (11), the lower end of the support plate (41) being rotatably connected to a rotating rod (42), the upper end of the support plate (41) being provided with a servo motor (43) for driving the rotating rod (42) to perform periodic forward and reverse rotation, the rotating rod (42) being fixedly connected to a second magnetic block (44), the peripheral side of the second magnetic block (44) being fixedly connected to a rotating disk (45), the rotating disk (45) being symmetrically provided with two slide grooves (46), the two sides of the second magnetic block (44) respectively extending into the two slide grooves (46), the slide groove (46) being slidably connected to a moving block (47), the upper end of the moving block (47) being fixedly connected to a fixed A shaft (48) is provided with a sleeve (49) rotatably sleeved on the fixed shaft (48), a connecting rod (410) is fixedly connected to the sleeve (49), extraction boxes (411) are symmetrically provided on both sides of the rotating disk (45), a piston block (412) is sealingly and slidably connected to the inner wall of the extraction box (411), the extraction box (411) is connected to a storage box (413) and a discharge box (414), a push plate (415) is fixedly connected to one side of the piston block (412), the push plate (415) extends outside the extraction box (411) and a transmission shaft (416) is fixedly connected to the top end thereof, the connecting rod (410) is rotatably connected to the transmission shaft (416), and a control component (417) for controlling the position of the moving block (47) in the slide groove (46) is also provided on the support plate (41).

6. The paper lunch box production packaging machine according to claim 5, characterized in that: The storage box (413) and the discharge box (414) are fixedly connected to the side wall of the support plate (41) via a second support rod and a third support rod, respectively; the upper end of the storage box (413) is fixedly connected to a three-way pipe (418); the three-way pipe (418) is fixedly connected to the two extraction boxes (411); a liquid discharge pipe (419) is fixedly connected between the discharge box (414) and the two extraction boxes (411); a first one-way valve is provided at the connection point between the three-way pipe (418) and the two extraction boxes (411) and in the two liquid discharge pipes (419).

7. The paper lunch box production packaging machine according to claim 6, characterized in that: The control component (417) comprises a humidity sensor (4171) fixedly connected to the side wall of the support plate (41) and a PLC controller (4172); an electromagnetic sheet is provided on a side of the moving block (47) close to the second magnetic block (44); the magnetic poles of the electromagnetic sheet and the side corresponding to the second magnetic block (44) attract each other; a tension spring (4173) is provided between a side of the moving block (47) away from the electromagnetic sheet and an inner wall of the slide groove (46); and the PLC controller (4172) adjusts the magnetic pole strength of the electromagnetic sheet according to humidity data fed back by the humidity sensor (4171).

8. The paper lunch box production packaging machine according to claim 5, characterized in that: An exhaust mechanism (5) is also provided directly below the rotating disk (45), the exhaust mechanism (5) comprising an exhaust cylinder (51) provided directly below the rotating disk (45) and coaxially arranged with the rotating disk (45), the exhaust cylinder (51) being fixedly connected to the side wall of the support plate (41) via a fourth support rod, the rotating rod (42) extending into the exhaust cylinder (51) and being coaxially fixedly connected to a threaded rod (52), the threaded rod (52) being sealingly threadedly sleeved with a piston plate (51). 3), the piston plate (53) is linearly slidably connected to the inner wall of the air pump (51), the inner bottom wall of the air pump (51) is fixedly connected to two air inlet nozzles (54), the lower end of the air pump (51) is fixedly connected to an air guide pipe (55), the lower end of the air guide pipe (55) is fixedly connected to an exhaust box (56), the lower end of the exhaust box (56) is fixedly connected to a plurality of exhaust nozzles, and a second one-way valve is provided in the air guide pipe (55) and the two air inlet nozzles (54).

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