A heat sealing device for biodegradable bags

Abstract

The utility model relates to bag sealing technical field, concretely is a kind of heat sealing device of biodegradable bag. It includes frame, bag mouth smoothing device and bag mouth heat sealing device. Frame is provided with mounting bracket;Bag mouth smoothing device includes lifting plate, two shift poles of sliding installation on lifting plate and the drive assembly for driving two shift poles mutually close or away;Second air cylinder for driving lifting plate lifting is installed on mounting bracket;Bag mouth heat sealing device includes two hot-pressing mechanisms of symmetrical arrangement. The utility model passes through bag mouth adsorption, smoothing, heat sealing and a series of orderly operation steps, realizes the high-quality sealing of biodegradable bag.

Description

Technical Field

[0001] This utility model relates to the field of bag sealing technology, and in particular to a heat-sealing device for biodegradable bags. Background Technology

[0002] The standard for biodegradable bags specifies the terminology and definitions, requirements, test methods, inspection rules, packaging, transportation, and storage of biodegradable plastic shopping bags. This standard applies to plastic shopping bags made from films produced primarily of biodegradable plastic resin, processed through bag-making processes such as heat sealing or bonding. It also applies to shopping bags made by combining biodegradable plastics with other materials. This standard does not apply to biodegradable plastic bags intended solely for packaging and not for carrying, such as biodegradable roll bags. Currently, biodegradable bags on the market require heat sealing during production, necessitating the use of heat-sealing equipment.

[0003] Patent CN217624467U discloses a heat-sealing device for biodegradable bags, which solves some problems that still exist in the use of existing heat-sealing devices on the market. Existing heat-sealing devices do not have a positioning and clamping device for biodegradable bags, which may lead to a reduction in heat-sealing quality when clamping biodegradable bags. The device includes a worktable, with side plates fixedly connected to both sides of the top of the worktable. A top plate is fixedly connected to the top of the two side plates. A hydraulic rod is located at the center of the bottom of the top plate. A sliding plate is fixedly connected to the bottom of the hydraulic rod. A heat-sealing plate is located at the bottom of the sliding plate. A fixing block is located at the center of the top of the worktable. A groove is formed at the top of the fixing block, and a fixing plate is slidably inserted into the inner cavity of the groove.

[0004] The aforementioned patents still have the following technical defects: because the material of biodegradable bags is relatively special, its flexibility and elasticity are different from ordinary plastic bags. Simple operations can easily cause wrinkles at the bag opening, affecting the heat sealing effect. Once the bag opening is not flat, the heat-sealed bag may not be properly sealed, making the contents of the bag susceptible to external factors, such as moisture or deterioration, reducing the quality and shelf life of the product. Manual stretching and smoothing operations can easily cause burns, and the operation is also relatively cumbersome. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a heat-sealing device for biodegradable bags.

[0006] The technical solution of this utility model is a heat-sealing device for biodegradable bags, which includes a frame, a bag opening smoothing device, and a bag opening heat-sealing device.

[0007] The frame is equipped with a mounting bracket; the bag opening smoothing device includes a lifting plate, two levers slidably mounted on the lifting plate, and a drive assembly for driving the two levers to move closer or further apart; a second cylinder for driving the lifting plate to move up and down is mounted on the mounting bracket; the bag opening heat sealing device includes two symmetrically arranged hot pressing mechanisms, each of which includes an insulation shell, a heating head, a push plate, and at least two sets of elastic connecting components. One end of the insulation shell has an opening, the heating head is movably located inside the insulation shell, and the push plate is located on the side of the insulation shell away from its opening. The push plate and the heating head are connected by multiple sets of elastic connecting components, each of which includes a guide rod and a spring. The guide rod movably passes through the inner and outer sides of the insulation shell, and its two ends are respectively connected to the heating head and the push plate. The spring is sleeved on the guide rod; a third cylinder for driving the push plate adjacent to it is mounted on the mounting bracket, and a moving frame is connected to the push plate on the other side. A first cylinder for driving the moving frame to move is mounted on the mounting bracket.

[0008] Preferably, it also includes a bag mouth adsorption device, which includes an air pump and two air suction nozzles. The two air suction nozzles are respectively installed on two heat insulation shells. The air pump is installed on a mounting bracket. A T-junction is installed at the air inlet end of the air pump. The two air suction nozzles are connected to the two interfaces of the T-junction through pipes.

[0009] Preferably, the drive assembly includes a servo motor, a gear, and two racks. The servo motor is mounted on the lifting plate, the gear is mounted on the output shaft of the servo motor, two sliding plates are slidably mounted on the lifting plate, two levers are respectively mounted on the ends of the two sliding plates, two first sliding holes are opened on the lifting plate for the two levers to slide, and two racks are respectively mounted on the two sliding plates, and both racks are meshed with the gear.

[0010] Preferably, a second sliding hole is provided at the end of one side of the sliding plate, and a connecting slider is connected to the upper end of the corresponding side lever. The connecting slider is movably disposed in the second sliding hole, and a movable slider is connected to the upper end of the connecting slider. The movable slider is slidably mounted on the sliding plate, and a pressure sensor is installed at the end of the sliding plate. The lever on the other side is fixedly connected to the corresponding side sliding plate.

[0011] Preferably, a PLC controller and a foot switch are installed on the frame, and the foot switch is electrically connected to the PLC controller.

[0012] Preferably, the heating head uses an electric heating wire.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects:

[0014] 1. This heat-sealing device drives two levers to move closer or further apart through a drive assembly, which can effectively open the bag opening and keep it in a taut state to ensure that the bag opening is flat and to guarantee the quality of heat sealing.

[0015] 2. The heat sealing device adopts two symmetrically arranged heat-pressing mechanisms. The heating head is connected to the push plate through an elastic connecting component. Through the initial clamping of the two heat-insulating shells, the bag opening can still maintain a smooth state after the lever is pulled out.

[0016] 3. The heating head is placed inside the insulation shell for a long time, which can reduce heat loss. Attached Figure Description

[0017] Figure 1 and Figure 2 All of these are schematic diagrams of the structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the bag opening smoothing device and the bag opening heat sealing device of this utility model.

[0019] Figure 4 This is a side sectional view of the thermal insulation shell in this utility model.

[0020] Figure 5 This is a side sectional view of the sliding plate in this utility model.

[0021] Reference numerals: 1. Frame; 2. Mounting bracket; 3. Insulated outer shell; 4. Heating head; 5. Moving frame; 6. First cylinder; 7. Second cylinder; 8. Air pump; 9. Intake nozzle; 10. PLC controller; 11. Lifting plate; 111. First sliding hole; 12. Guide rod; 13. Spring; 14. Toggle lever; 15. Push plate; 16. Third cylinder; 17. Moving slider; 18. Connecting slider; 19. Sliding plate; 191. Second sliding hole; 20. Servo motor; 21. Gear; 22. Rack; 23. Pressure sensor; 24. Foot switch. Detailed Implementation

[0022] Example 1

[0023] like Figures 1-5 As shown in the figure, the heat sealing device for a biodegradable bag proposed in this embodiment includes a frame 1, a bag opening smoothing device, and a bag opening heat sealing device.

[0024] A mounting bracket 2 is provided on the frame 1; the bag opening smoothing device includes a lifting plate 11, two levers 14 slidably mounted on the lifting plate 11, and a drive assembly for driving the two levers 14 to move closer or further apart. The drive assembly includes a servo motor 20, a gear 21, and two racks 22. The servo motor 20 is mounted on the lifting plate 11, and the gear 21 is mounted on the output shaft of the servo motor 20. Two sliding plates 19 are slidably mounted on the lifting plate 11, and the two levers 14 are respectively mounted on the ends of the two sliding plates 19. The lifting plate 11 has two first sliding holes 111 for the two levers 14 to slide. The two racks 22 are respectively mounted on the two sliding plates 19, and both racks 22 are meshed with the gear 21. A second cylinder 7 for driving the lifting plate 11 to rise and fall is installed on the mounting bracket 2.

[0025] The bag heat-sealing device includes two symmetrically arranged heat-pressing mechanisms. Each heat-pressing mechanism includes an insulation shell 3, a heating head 4, a push plate 15, and at least two sets of elastic connecting components. One end of the insulation shell 3 has an opening. The heating head 4 is movably located inside the insulation shell 3 and is heated by an electric heating wire. The push plate 15 is located on the side of the insulation shell 3 away from its opening. The push plate 15 and the heating head 4 are connected by multiple sets of elastic connecting components. Each set of elastic connecting components includes a guide rod 12 and a spring 13. The guide rod 12 movably passes through the inner and outer sides of the insulation shell 3 and its two ends are respectively connected to the heating head 4 and the push plate 15. The spring 13 is sleeved on the guide rod 12. A third cylinder 16 for driving the push plate 15 on one side to move is installed on the mounting frame 2. A moving frame 5 is connected to the push plate 15 on the other side. A first cylinder 6 for driving the moving frame 5 to move is installed on the mounting frame 2.

[0026] A second sliding hole 191 is provided at the end of one side sliding plate 19. A connecting slider 18 is connected to the upper end of the corresponding side lever 14. The connecting slider 18 is movably disposed in the second sliding hole 191. A movable slider 17 is connected to the upper end of the connecting slider 18. The movable slider 17 is slidably mounted on the sliding plate 19. A pressure sensor 23 is installed at the end of the sliding plate 19. The lever 14 on the other side is fixedly connected to the corresponding side sliding plate 19. When the lever 14 opens the bag opening, the movable slider 17 slides on the sliding plate 19. The pressure sensor 23 will monitor the pressure when the bag opening is opened in real time. Once the pressure exceeds the preset value, the PLC controller 10 will adjust the speed of the servo motor 20 or stop the operation of the servo motor 20 in time to avoid damaging the bag opening due to excessive opening.

[0027] A PLC controller 10 and a foot switch 24 are installed on the frame 1. The foot switch 24 is electrically connected to the PLC controller 10. Before the next round of heat sealing work, the operator can send a signal to the PLC controller 10 through the foot switch 24. The PLC controller 10 automatically controls the orderly operation of multiple devices.

[0028] The working principle of this technical solution is as follows:

[0029] The operator places the opening of the biodegradable bag to be sealed between two heat-sealing devices. After the bag opening is opened, the PLC controller 10 controls the second cylinder 7 to start working. The second cylinder 7 drives the lifting plate 11 to descend, so that the two levers 14 are inserted into the inside of the bag opening. After the levers 14 are inserted into the bag opening, the PLC controller 10 controls the servo motor 20 to start. The output shaft of the servo motor 20 drives the gear 21 to rotate. The rotation of the gear 21 will drive the two racks 22 to move in opposite directions. The two levers 14 are respectively installed at the ends of the two sliding plates 19, so that the two levers 14 move away from each other. As the levers 14 move away from each other, the bag opening will be gradually opened and tightened.

[0030] Once the bag opening is smoothed out, the PLC controller 10 controls the third cylinder 16 and the first cylinder 6 to start simultaneously. The third cylinder 16 drives the push plate 15 on its adjacent side to move, and the first cylinder 6 drives the moving frame 5 to move, thereby driving the push plate 15 on the other side to move, so that the two push plates 15 move closer to each other, so that the smoothed bag opening is clamped between the two insulation shells 3. The clamping force is small in the initial stage, which is to facilitate the subsequent removal of the lever 14.

[0031] After the initial clamping is completed, the output shaft of the second cylinder 7 is retracted, causing the lifting plate 11 to rise. At this time, the two levers 14 move out from the inside of the bag opening.

[0032] After the lever 14 is pulled out, the third cylinder 16 and the first cylinder 6 continue to push the push plate 15 to move. Since the push plate 15 and the heating head 4 are connected by multiple sets of elastic connecting components, when the push plate 15 continues to move, the heat insulation shell 3 no longer moves. At this time, the spring 13 is compressed. The compression of the spring 13 causes the guide rod 12 to move inside and outside the heat insulation shell 3. Finally, the heating heads 4 on both sides extend from the inside of the heat insulation shell 3 on both sides. The heating heads on both sides finally contact the two ends of the bag opening, so that the material of the bag opening is heated, melted and glued together, thus achieving the sealing of the bag opening.

[0033] Example 2

[0034] like Figure 1 As shown, the heat-sealing device for a biodegradable bag proposed in this embodiment, compared with the first embodiment, also includes a bag mouth adsorption device. The bag mouth adsorption device includes an air pump 8 and two air inlet nozzles 9. The two air inlet nozzles 9 are respectively installed on two heat insulation shells 3. The air pump 8 is installed on the mounting frame 2. A three-way valve is installed at the air inlet end of the air pump 8. The two air inlet nozzles 9 are connected to the two interfaces of the three-way valve through pipes.

[0035] In this embodiment, before heat sealing, the air start pump 8 is controlled to work. After the air pump 8 starts working, the two suction nozzles 9 begin to suction the two sides of the bag opening. Under the action of suction, the bag opening will automatically form an open state. This open state makes it easier to insert the lever 14, eliminating the need for the tedious process of manually opening the bag opening and improving work efficiency.

[0036] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A heat-sealing device for a biodegradable bag, characterized in that, Includes a frame (1), a bag opening smoothing device, and a bag opening heat sealing device; A mounting frame (2) is provided on the frame (1); the bag opening smoothing device includes a lifting plate (11), two levers (14) slidably mounted on the lifting plate (11), and a drive assembly for driving the two levers (14) to move closer or further apart; a second cylinder (7) for driving the lifting plate (11) to move up and down is installed on the mounting frame (2); the bag opening heat sealing device includes two symmetrically arranged heat pressing mechanisms, each of which includes an insulation shell (3), a heating head (4), a push plate (15), and at least two sets of elastic connecting assemblies. One end of the insulation shell (3) has an opening, the heating head (4) is movably located inside the insulation shell (3), and the push plate (15) is located inside the insulation shell (3). The outer shell (3) is away from its opening side. The push plate (15) and the heating head (4) are connected by multiple sets of elastic connection components. Each set of elastic connection components includes a guide rod (12) and a spring (13). The guide rod (12) moves through the inner and outer sides of the outer shell (3) and its two ends are connected to the heating head (4) and the push plate (15) respectively. The spring (13) is sleeved on the guide rod (12). A third cylinder (16) for driving the push plate (15) on one side adjacent to it is installed on the mounting frame (2). A moving frame (5) is connected to the push plate (15) on the other side. A first cylinder (6) for driving the moving frame (5) is installed on the mounting frame (2).

2. The heat-sealing device for a biodegradable bag according to claim 1, characterized in that, It also includes a bag mouth adsorption device, which includes an air pump (8) and two air inlets (9). The two air inlets (9) are respectively installed on two heat insulation shells (3). The air pump (8) is installed on the mounting bracket (2). The air inlet end of the air pump (8) is equipped with a three-way valve. The two air inlets (9) are connected to the two interfaces of the three-way valve through pipes.

3. The heat-sealing device for a biodegradable bag according to claim 1, characterized in that, The drive assembly includes a servo motor (20), a gear (21), and two racks (22). The servo motor (20) is mounted on the lifting plate (11), and the gear (21) is mounted on the output shaft of the servo motor (20). Two sliding plates (19) are slidably mounted on the lifting plate (11). Two levers (14) are respectively mounted on the ends of the two sliding plates (19). The lifting plate (11) has two first sliding holes (111) for the two levers (14) to slide. The two racks (22) are respectively mounted on the two sliding plates (19), and both racks (22) are meshed with the gear (21).

4. The heat-sealing device for a biodegradable bag according to claim 3, characterized in that, A second sliding hole (191) is provided at the end of one side sliding plate (19), and a connecting slider (18) is connected to the upper end of the corresponding side lever (14). The connecting slider (18) is movably disposed in the second sliding hole (191). A movable slider (17) is connected to the upper end of the connecting slider (18). The movable slider (17) is slidably mounted on the sliding plate (19). A pressure sensor (23) is installed at the end of the sliding plate (19). The lever (14) on the other side is fixedly connected to the corresponding side sliding plate (19).

5. The heat-sealing device for a biodegradable bag according to claim 1, characterized in that, A PLC controller (10) and a foot switch (24) are installed on the frame (1), and the foot switch (24) is electrically connected to the PLC controller (10).

6. The heat-sealing device for a biodegradable bag according to claim 1, characterized in that, The heating head (4) is heated by an electric heating wire.

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