Heat sealing device for plastic bags

Abstract

The utility model provides a heat sealing device for plastic bags, which relates to the technical field of plastic bag processing and comprises a dotted line cutter, a heat sealing table, a workbench, a U-shaped mounting plate, an adjusting component, a support, an unwinding mechanism and a winding mechanism, the workbench is fixed on the support, and the heat sealing table, the U-shaped mounting plate, the unwinding mechanism and the winding mechanism are mounted on the workbench. The bottom of the U-shaped mounting plate is connected with a telescopic part, the movable end of the telescopic part is connected with a mounting seat, the dotted line cutter is mounted on the mounting seat, the two sides of the mounting seat are connected with heat sealing plates, the heat sealing table and the adjusting assembly are connected with the U-shaped mounting plate, and a plurality of stretching rollers are arranged between the unwinding mechanism and the mounting plate and can stretch and release plastic bags. The tension of the plastic bag is uniform, the plastic bag is prevented from being wrinkled, warped or sealed, the heat sealing effect of the plastic bag is improved, the plastic bag is close to the heat sealing table through the adjusting assembly, heat sealing and cutting of the plastic bag are facilitated, the unwinding mechanism is matched with the winding mechanism, and the heat sealing efficiency of the plastic bag is improved.

Description

Technical Field

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

[0002] Heat sealing refers to the process of melting and bonding the sealing portion of a plastic film together through heating. It is a crucial step in the production of plastic bags, and the quality of heat sealing directly affects the bag's airtightness and appearance. Traditional heat sealing devices typically use heating plates or heat sealing strips to heat the plastic film, causing it to fuse and form a seal. However, in actual production, due to the uneven flexibility and tension of the plastic film, wrinkles, warping, or insecure sealing can easily occur at the heat-sealed area, leading to decreased airtightness and affecting the heat-sealing effect of the plastic film. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the aforementioned technologies by proposing a heat-sealing device for plastic bags, thereby resolving the problems described above.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A heat-sealing device for plastic bags includes a dotted line cutter, a heat-sealing table, a worktable, a U-shaped mounting plate, an adjusting component, a bracket, an unwinding mechanism, and a winding mechanism. The worktable is fixed to the bracket. The heat-sealing table, the U-shaped mounting plate, the unwinding mechanism, and the winding mechanism are mounted on the worktable. The U-shaped mounting plate is located between the unwinding mechanism and the winding mechanism. A telescopic component is connected to the bottom of the U-shaped mounting plate, and a mounting base is connected to the movable end of the telescopic component. The dotted line cutter is mounted on the mounting base. Heat-sealing plates connected to the mounting base are respectively provided on both sides of the dotted line cutter. The heat-sealing table and the adjusting component are respectively connected to the U-shaped mounting plate. The adjusting component is located above the heat-sealing table. A plurality of stretching rollers are provided between the unwinding mechanism and the mounting plate.

[0006] Preferably, the adjustment assembly includes two adjustment rods, with elastic elements connected to both ends of the two adjustment rods. The free ends of the elastic elements are connected to the U-shaped mounting plate, and a gap is left between the adjustment rods and the heat sealing table for a plastic bag to pass through.

[0007] Preferably, the U-shaped mounting plate has two mounting grooves on each side, and the elastic element is disposed in the mounting groove.

[0008] Preferably, the heat sealing table is provided with a groove, and the groove corresponds to the direction of the dotted line.

[0009] Preferably, both ends of the plurality of stretching rollers are respectively mounted on the worktable via support seats.

[0010] Preferably, the unwinding mechanism includes a first motor, an unwinding shaft, and two first bearing seats. The two first bearing seats are respectively installed on both sides of the worktable. The two ends of the unwinding shaft are respectively connected to the two first bearing seats, and the output end of the first motor is connected to the unwinding shaft.

[0011] Preferably, the winding mechanism includes a second motor, a winding shaft, and two second bearing seats. The two second bearing seats are respectively installed on both sides of the worktable. The two ends of the winding shaft are respectively connected to the two second bearing seats, and the output end of the second motor is connected to the winding shaft.

[0012] Preferably, it further includes a tension sensor and a control unit. The tension sensor is mounted on the worktable and is electrically connected to the control unit. The control unit is electrically connected to the controlled end of the unwinding mechanism and the winding mechanism.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The unwinding mechanism can wind up unsealed plastic bags and plastic bags with cut easy-tear lines, while the winding mechanism can wind up heat-sealed plastic bags and plastic bags with cut easy-tear lines. After being stretched by several stretching rollers, the plastic bag passes through the gap between the adjusting component and the heat sealing table. The stretching rollers can stretch the released plastic bag and make the plastic bag tension uniform, avoiding wrinkles, warping or sealing of the plastic bag, and improving the heat sealing effect of the plastic bag. The adjusting component can make the plastic bag close to the heat sealing table, which facilitates the heat sealing plate to heat-seal the plastic bag and the dotted line knife to cut the plastic bag. Through the cooperation of the unwinding mechanism and the winding mechanism, the plastic bag can be released and wound up at the same time, and the plastic bag can be continuously heat-sealed and cut, improving the heat sealing efficiency of the plastic bag. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a heat-sealing device for plastic bags according to the present invention;

[0016] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle;

[0017] Figure 3 This is a three-dimensional structural diagram of a heat-sealing device for plastic bags according to the present invention;

[0018] Figure 4 for Figure 3 A magnified structural diagram of part B in the middle;

[0019] Figure 5 This is a three-dimensional structural diagram of Embodiment 2 of the present invention;

[0020] Figure 6This is a schematic diagram of the circuit connection of Embodiment 2 of this utility model;

[0021] In the diagram, 1. Dashed line knife; 2. Heat sealing table; 3. Worktable; 4. U-shaped mounting plate; 5. Adjustment component; 6. Adjustment roller; 7. Elastic element; 8. Bracket; 9. Unwinding mechanism; 10. First motor; 11. Unwinding shaft; 12. First bearing seat; 13. Rewinding mechanism; 14. Second motor; 15. Rewinding shaft; 16. Second bearing seat; 17. Telescopic element; 18. Mounting seat; 19. Heat sealing plate; 20. Unwinding roller; 21. Gap; 22. Plastic bag; 23. Mounting groove; 24. Thread groove; 25. Support seat; 26. Tension sensor; 27. Control unit. Detailed Implementation

[0022] To better understand the technical content of this utility model, specific embodiments are provided below, and the utility model will be further described in conjunction with the accompanying drawings.

[0023] Example 1

[0024] See Figures 1 to 4This utility model provides a heat-sealing device for plastic bags, including a dotted-line knife 1, a heat-sealing table 2, a worktable 3, a U-shaped mounting plate 4, an adjusting component 5, a bracket 8, an unwinding mechanism 9, and a winding mechanism 13. The worktable 3 is fixed on the bracket 8, serving to support and fix the worktable 3. The heat-sealing table 2, the U-shaped mounting plate 4, the unwinding mechanism 9, and the winding mechanism 13 are installed on the worktable 3. The unwinding mechanism 9 releases the plastic bag 22 and winds up the plastic bag 22 formed after heat sealing and cutting. The U-shaped mounting plate 4 is located between the unwinding mechanism 9 and the winding mechanism 13. A telescopic component 17 is connected to the bottom of the U-shaped mounting plate 4. The telescopic component 17 is an electric telescopic rod, a hydraulic telescopic rod, or a pneumatic push rod. The movable end of the telescopic component 17 is connected to a mounting base 18. A heater for heating the heat-sealing plate 19 is installed in the mounting base 18. This heater is existing technology. The dotted-line knife 1 is installed on the mounting base 18. The dotted-line knife 1 can heat the plastic bag. An easy-tear line is cut on the plastic bag 22. Heat-sealing plates 19, connected to the mounting base 18, are respectively provided on both sides of the dotted-line cutter 1. The two heat-sealing plates 19 heat-seal the plastic bag 22. The easy-tear line cut by the dotted-line cutter 1 is located between the two heat-sealing lines, making it easy to tear the plastic bag 22. The dotted-line cutter 1 protrudes from the heat-sealing plates 19 on both sides. The heat-sealing platform 2 and the adjusting component 5 are respectively connected to the U-shaped mounting plate 4. The adjusting component 5 is located above the heat-sealing platform 2. 5 allows the plastic bag 22 to be close to the heat sealing table 2, facilitating the heat sealing plate 19 to heat seal the plastic bag 22. The dotted line knife 1 cuts out an easy-tear line. Several stretching rollers 20 are provided between the unwinding mechanism 9 and the mounting plate. The two ends of the stretching rollers 20 are respectively installed on the worktable 3 through the support base 25. The stretching rollers 20 can stretch the plastic bag 22 and make the tension of the plastic bag 22 uniform, avoiding wrinkles, warping or sealing of the plastic bag 22, and improving the heat sealing effect of the plastic bag 22.

[0025] The adjusting assembly 5 includes two adjusting rollers 6, with elastic elements 7 connected to both ends of the two adjusting rollers 6. The elastic elements 7 are pressure springs, and the free ends of the elastic elements 7 are connected to the U-shaped mounting plate 4. A gap 21 is left between the adjusting rollers 6 and the heat sealing table 2 for the plastic bag 22 to pass through. The unwinding mechanism 9 releases the plastic bag 22, which passes through the gap 21 after being stretched by several stretching rollers 20. Two mounting grooves 23 are provided on both sides of the U-shaped mounting plate 4, and the elastic elements 7 are set in the mounting grooves 23. The plastic bag 22 can pass through the gap 21 by sliding the adjusting rollers 6 upward. After passing through, the elastic elements 7 return to their original position, and the adjusting rollers 6 move downward, limiting the distance between the plastic bag 22 and the heat sealing plate 19.

[0026] The heat sealing table 2 is provided with a groove 24, which corresponds to the dotted line knife 1. The dotted line knife 1 protrudes from the heat sealing plates 19 on the left and right sides. When the dotted line knife 1 cuts the plastic bag 22, it is embedded in the groove 24. This ensures that the plastic bag 22 is cut with an easy-tear line, while avoiding the heat sealing plate 19 from moving down too much and causing the plastic bag 22 to break during heat sealing.

[0027] The unwinding mechanism 9 includes a first motor 10, an unwinding shaft 11, and two first bearing seats 12. The two first bearing seats 12 are respectively installed on both sides of the workbench 3. The two ends of the unwinding shaft 11 are respectively connected to the two first bearing seats 12. The output end of the first motor 10 is connected to the unwinding shaft 11. The first motor 10 drives the unwinding shaft 11 to rotate and release the plastic bag 22.

[0028] The winding mechanism 13 includes a second motor 14, a winding shaft 15, and two second bearing seats 16. The two second bearing seats 16 are respectively installed on both sides of the workbench 3. The two ends of the winding shaft 15 are respectively connected to the two second bearing seats 16. The output end of the second motor 14 is connected to the winding shaft 15. The second motor 14 drives the winding shaft 15 to rotate and wind up the plastic bag 22 that has been heat-sealed and cut with easy-tear lines.

[0029] In use, the unsealed and untearable plastic bag 22 is wound onto the unwinding roller of the unwinding mechanism 9. One end of the plastic bag 22 is stretched by several stretching rollers 20, passes through the gap 21 between the adjusting roller 6 and the heat sealing table 2, and then wound onto the take-up shaft 15 of the take-up mechanism 13. The telescopic component 17 drives the mounting base 18, the dotted line knife 1, and the two heat sealing plates 19 to move down. The two heat sealing plates 19 heat seal the plastic bag 22. The dotted line knife 1 cuts an easy tear line on the plastic bag 22. The easy tear line is located between the two heat sealing marks. The first motor 10 drives the unwinding shaft 11 to rotate and release the plastic bag 22. The second motor 14 starts and drives the take-up shaft 15 to wind up the plastic bag 22, continuously heat sealing and cutting the plastic bag 22 to improve the heat sealing efficiency of the plastic bag 22.

[0030] Example 2

[0031] See Figures 5 to 6The difference between this embodiment and embodiment 1 is that it also includes a tension sensor 26 and a control unit 27. The tension sensor 26 is installed on the worktable 3 and is electrically connected to the control unit 27. The control unit 27 is electrically connected to the controlled end of the unwinding mechanism 9 and the winding mechanism 13. The control unit 27 is a PLC controller. The tension sensor 26 detects the tension progress of the plastic bag 22 on the unwinding roller 20. The PLC controller adjusts the speed of the first motor 10 of the unwinding mechanism 9 and the speed of the second motor 14 of the winding mechanism 13 according to the tension progress of the plastic bag 22, so that the linear speed of the plastic bag 22 on the unwinding mechanism 9 and the winding mechanism 13 is synchronized (i.e., the movement speed of the plastic bag 22 is the same), ensuring that the length of the plastic bag 22 released and wound up is equal.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heat-sealing device for plastic bags, characterized in that: The assembly includes a dotted line cutter (1), a heat sealing table (2), a worktable (3), a U-shaped mounting plate (4), an adjustment assembly (5), a bracket (8), an unwinding mechanism (9), and a winding mechanism (13). The worktable (3) is fixed to the bracket (8). The heat sealing table (2), the U-shaped mounting plate (4), the unwinding mechanism (9), and the winding mechanism (13) are mounted on the worktable (3). The U-shaped mounting plate (4) is located between the unwinding mechanism (9) and the winding mechanism (13). The bottom of the U-shaped mounting plate (4) is... A telescopic component (17) is connected, and the movable end of the telescopic component (17) is connected to a mounting base (18). The dotted line knife (1) is mounted on the mounting base (18). Heat sealing plates (19) connected to the mounting base (18) are respectively provided on both sides of the dotted line knife (1). The heat sealing table (2) and the adjustment component (5) are respectively connected to the U-shaped mounting plate (4). The adjustment component (5) is located above the heat sealing table (2). Several stretching rollers (20) are provided between the unwinding mechanism (9) and the mounting plate.

2. The heat-sealing device for plastic bags as described in claim 1, characterized in that: The adjustment assembly (5) includes two adjustment rods (6), and elastic elements (7) are connected to both ends of the two adjustment rods (6). The free end of the elastic element (7) is connected to the U-shaped mounting plate (4). A gap (21) is left between the adjustment rod (6) and the heat sealing table (2) for the plastic bag (22) to pass through.

3. The heat-sealing device for plastic bags as described in claim 2, characterized in that: The U-shaped mounting plate (4) has two mounting slots (23) on each side, and the elastic element (7) is disposed in the mounting slot (23).

4. The heat-sealing device for plastic bags as described in claim 1, characterized in that: The heat sealing table (2) is provided with a groove (24), which corresponds to the dotted line knife (1).

5. The heat-sealing device for plastic bags as described in claim 1, characterized in that: Both ends of several of the stretching rollers (20) are respectively mounted on the worktable (3) via support bases (25).

6. The heat-sealing device for plastic bags as described in claim 1, characterized in that: The unwinding mechanism (9) includes a first motor (10), an unwinding shaft (11), and two first bearing seats (12). The two first bearing seats (12) are respectively installed on both sides of the workbench (3). The two ends of the unwinding shaft (11) are respectively connected to the two first bearing seats (12). The output end of the first motor (10) is connected to the unwinding shaft (11).

7. The heat-sealing device for plastic bags as described in claim 1, characterized in that: The winding mechanism (13) includes a second motor (14), a winding shaft (15) and two second bearing seats (16). The two second bearing seats (16) are respectively installed on both sides of the worktable (3). The two ends of the winding shaft (15) are respectively connected to the two second bearing seats (16). The output end of the second motor (14) is connected to the winding shaft (15).

8. The heat-sealing device for plastic bags as described in claim 1, characterized in that: It also includes a tension sensor (26) and a control unit (27). The tension sensor (26) is mounted on the worktable (3). The tension sensor (26) is electrically connected to the control unit (27). The control unit (27) is electrically connected to the controlled end of the unwinding mechanism (9) and the winding mechanism (13).

9. A heat-sealing device for plastic bags as described in claim 8, characterized in that: The control unit (27) is a PLC controller.

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