Upper and lower film aligning device for bag making process

Abstract

The utility model relates to the technical field of plastic film transverse sealing, and discloses an upper and lower film aligning device for a bag making process, the upper and lower film aligning device comprises a workbench, a first mounting rack, an upper film pull rod and an upper film driving piece, the first mounting rack is arranged on the workbench, and an upper film and a lower film can penetrate through the lower part of the first mounting rack; the upper film pull rod is arranged on the first mounting frame in an up-down moving mode, the upper film pull rod is connected between an upper film and a lower film in an inserted mode, the upper film driving piece can drive the upper film pull rod to move up and down, and the device has the effects that the stretching lengths of the upper film and the lower film can be adjusted, and the upper film and the lower film are aligned.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of plastic film transverse sealing, in particular to an upper and lower film alignment device for a bag making process. BACKGROUND

[0002] A plastic bag is generally composed of an inner film and an outer film, and correspondingly, in the production process of large plastic bags, the inner film and the outer film are first produced separately, and then the inner film and the outer film are overlapped together, and the upper film and the lower film are fixed by heat sealing, so as to transversely seal the plastic bag.

[0003] Since the upper film and the lower film are not printed and compounded at the same time in the previous process, under the influence of equipment temperature and tension, the length of the upper film and the lower film will have errors, and in the bag making process, the upper film and the lower film cannot be aligned, and the error will gradually accumulate with processing, so that the patterns of the upper film and the lower film cannot be aligned, thereby seriously affecting the appearance and quality of the bag. CONTENT OF THE INVENTION

[0004] In order to adjust the stretching length of the upper and lower films and align the upper film with the lower film, the application provides an upper and lower film alignment device for a bag making process.

[0005] The application provides an upper and lower film alignment device for a bag making process, which adopts the following technical scheme:

[0006] An upper and lower film alignment device for a bag making process, comprising a workbench, a first mounting frame, an upper film pull rod and an upper film driving member, the first mounting frame is arranged on the workbench, the upper film and the lower film can pass from below the first mounting frame, the upper film pull rod is arranged on the first mounting frame and moves up and down, and the upper film pull rod is inserted between the upper film and the lower film, and the upper film driving member can drive the upper film pull rod to move up and down.

[0007] By adopting the above technical scheme, the upper film driving member drives the upper film pull rod to move up and down, so as to drive the upper film to be stretched upwards, that is, to adjust the stretching length of the upper film, so that the upper film is aligned with the lower film. This design can effectively ensure that the position deviation of the upper film and the lower film during the bag making process is reduced, and the bag making quality is improved.

[0008] Optionally, the upper film driving member comprises a first air cylinder, and the first air cylinder extends downward and is connected with the upper film pull rod.

[0009] By adopting the above technical scheme, the first air cylinder is used as a driving source, which has the advantages of simple structure, rapid action and precise control, and can stably drive the upper film pull rod to move up and down.

[0010] Optionally, the upper film driving member further comprises a driving plate, the driving plate is connected with the telescopic shaft of the first cylinder, and the upper film pull rod is connected with the driving plate at both ends.

[0011] By adopting the technical scheme, the design of the driving plate makes the stress of the upper film pull rod more uniform, and deviation caused by single-point stress is avoided.

[0012] Optionally, the upper film pull rod is divided into two sections in the middle, and a connecting rod is arranged at the end of each section away from the other, and the upper end of the connecting rod is connected to the driving plate.

[0013] By adopting the technical scheme, in some working conditions, the upper film and the lower film are heat-sealed from the middle part before being transversely sealed, and the upper film pull rod is divided into two sections in the middle, so that the part of the upper film and the lower film that is adhered in the middle can smoothly pass through the upper film pull rod.

[0014] Optionally, the second mounting frame, the lower film pull rod and the lower film driving member are further included, the second mounting frame is arranged on the workbench, the upper film and the lower film can pass above the second mounting frame, the lower film pull rod is arranged on the second mounting frame and moves up and down, the lower film pull rod is inserted between the upper film and the lower film, and the lower film driving member can drive the lower film pull rod to move up and down.

[0015] By adopting the technical scheme, the second mounting frame and the lower film pull rod are arranged, independent control of the lower film is realized, and cooperation with the upper film pull rod can more comprehensively ensure alignment of the upper film and the lower film, and the precision and efficiency of bag making are improved.

[0016] Optionally, the plastic film position detector, the displacement sensor and the controller are further included, the plastic film position detector is used to detect the positions of the upper film and the lower film, the displacement sensor is arranged at the end of the telescopic shaft of the first cylinder, and the controller is connected with the displacement sensor and the plastic film position detector, respectively.

[0017] By adopting the technical scheme, the detection and control devices can monitor the positions of the upper film and the lower film and the movement state of the telescopic shaft of the first cylinder in real time, and precise control is realized through the controller, so that the degree of automation and the precision of alignment are further improved.

[0018] Optionally, a threaded rod is arranged at the upper end of the connecting rod, a fixing nut is threadedly connected to the threaded rod, a positioning hole is arranged on the driving plate and used for slidingly penetrating the threaded rod, and the end face of the connecting rod can abut against the driving plate after the threaded rod penetrates through the positioning hole.

[0019] By adopting the technical scheme, the upper film pull rod is detachably arranged, so that the upper film pull rod can be inserted between the upper film and the lower film, and installation is more convenient.

[0020] Optionally, a positioning rod is arranged between the connecting rod and the threaded rod, and the positioning hole is arranged in cooperation with the positioning rod, so that the connecting rod is limited to rotate when the positioning rod is inserted into the positioning hole.

[0021] By adopting the above technical scheme, when the positioning rod is inserted into the positioning hole, the connecting rod is limited to rotate, which effectively prevents the rotation of the connecting rod, thereby avoiding the alignment deviation caused by rotation and improving the stability and reliability of the device.

[0022] Optionally, a plurality of positioning holes are arranged along the length direction of the driving plate.

[0023] By adopting the above technical scheme, a plurality of positioning holes are arranged along the length direction of the driving plate, which makes the connection position of the connecting rod adjustable, so that the upper film pulling rod can adapt to plastic films of different widths, thereby improving the adaptability of the device.

[0024] In summary, the present application has at least one of the following beneficial effects:

[0025] 1. By adjusting the stretching length of the upper film and the lower film through the cooperation of the upper and lower film pulling rods and the driving member, and by real-time monitoring and control of the position of the plastic film, the precise alignment of the upper and lower films is realized, which significantly improves the precision and efficiency of bag making.

[0026] 2. By detachable connection between the connecting rod of the upper film pulling rod and the driving plate, and by adjustable setting of the connection position, plastic films of different widths can be adapted. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of Example 1;

[0028] Figure 2 is a structural schematic diagram of the upper film driving member in Example 1;

[0029] Figure 3 is a partial structural schematic diagram of Example 2;

[0030] Figure 4 is an exploded structural schematic diagram of the connecting rod in Example 2.

[0031] BRIEF DESCRIPTION OF DRAWINGS DETAILED DESCRIPTION

[0032] The application will be further described below in conjunction with the accompanying drawings. Figures 1-4 The application will be further described below in conjunction with the accompanying drawings.

[0033] Embodiment 1

[0034] The application discloses an upper and lower film alignment device for a bag making process. Referring to Figure 1 , the upper and lower film alignment device comprises a workbench 1, a first mounting frame 2, an upper film pull rod 3 and an upper film driving member 4. The transverse sealing device 101 is arranged on the workbench 1 and can seal the upper film 102 and the lower film 103. The first mounting frame 2 is arranged on the workbench 1 and located before the transverse sealing device 101. The upper film pull rod 3 is arranged on the first mounting frame 2 and can move up and down and is inserted between the upper film 102 and the lower film 103. The upper film driving member 4 can drive the upper film pull rod 3 to move up and down, so as to adjust the stretching length of the upper film 102 through the pull rod, so that the upper film 102 and the lower film 103 are aligned, and the error between the upper film 102 and the lower film 103 is corrected.

[0035] Referring to Figure 1 and Figure 2 , specifically, the first mounting frame 2 comprises a horizontal support rod and vertical support rods located at both ends of the horizontal support rod. The lower end of the vertical support rod is fixed on the workbench 1 by welding or bolts and the like. The transverse support frame is fixed on the two vertical support rods and the length direction of the transverse support frame is parallel to the width direction of the workbench 1. Thus, the first mounting frame 2 is in an inverted “U” shape structure, and the upper film 102 and the lower film 103 can pass through below the first mounting frame 2 in an overlapping manner.

[0036] Referring to Figure 1 and Figure 2 , in the embodiment of the application, the upper film driving member 4 is preferably a first air cylinder 41. The first air cylinder 41 is fixed on the horizontal support rod of the first mounting frame 2 by bolts and the like and is preferably arranged at the middle position. The extension shaft of the first air cylinder 41 extends downward along the vertical direction. The end of the extension shaft of the first air cylinder 41 is connected to a driving plate 42 by welding or bolts and the like. The driving plate 42 can be a rectangular plate. The length direction of the driving plate 42 is also parallel to the width direction of the workbench 1. The upper film pull rod 3 is arranged on the driving plate 42.

[0037] Further specifically, the upper film pulling rod 3 is in a round rod structure, so that the upper film 102 is not easily abraded when passing over the upper surface of the upper film pulling rod 3. In actual production, the middle part of the upper film 102 and the lower film 103 needs to be heat sealed before horizontal sealing of the plastic mold, so the upper film pulling rod 3 is divided into two sections in the middle, and the two ends of the two sections of the upper film pulling rod 3 are connected with a connecting rod 5 through welding or bending, etc. The connecting rod 5 can also be a round rod, and the connecting rod 5 extends upward and is connected to the driving plate 42, so as to fix the upper film pulling rod 3 to the driving plate 42. When the first cylinder 41 is started, the upper film pulling rod 3 can be driven to move up and down through the telescopic shaft, so as to adjust the stretching length of the upper film 102.

[0038] Referring to Figure 1 In an alternative embodiment, the upper and lower film alignment device can further include a second mounting frame 6, a lower film pulling rod 7 and a lower film driving member 8. The second mounting frame 6 is arranged on the workbench 1, and the second mounting frame 6 and the first mounting frame 2 are arranged in a length direction of the workbench 1. The upper film 102 and the lower film 103 pass above the second mounting frame 6. The lower film driving member 8 can be a second cylinder, which is fixed to the second mounting frame 6. The telescopic shaft of the second cylinder is arranged vertically upward. The lower film pulling rod 7 is arranged above the second mounting frame 6 and is controlled by the telescopic shaft of the second cylinder. The connection between the lower film pulling rod 7 and the second cylinder is the same as the connection between the upper film pulling rod 3 and the first cylinder 41, which will not be described here.

[0039] By adding the lower film pulling rod 7, the stretching length of the lower film 103 can be adjusted by moving the lower film pulling rod 7 downward, which makes the upper and lower films be accurately controlled, so as to further improve the alignment accuracy.

[0040] In an alternative embodiment, the upper and lower film alignment device further includes a plastic film position detector, a displacement sensor and a controller (not shown in the figure). The plastic film position detector can be a photoelectric sensor, which is arranged before the first mounting frame 2 and the second mounting frame 6, and is used to detect the position of the upper film 102 and the lower film 103, so as to assist in calculating the deviation between the upper film 102 and the lower film 103. The displacement sensor can be arranged at the end of the telescopic shaft of the first cylinder 41 and the second cylinder, or can be arranged on the driving plate 42, and is used to detect the stroke of the first cylinder 41 and the second cylinder in real time; so as to adjust the position of the upper film pulling rod 3 and the lower film pulling rod 7 in combination with the detection information of the plastic film position detector, to ensure that the adjustment amount of the upper film 102 and the lower film 103 in each heat sealing cycle meets the preset value. The controller is a control center, and the controller is connected with the plastic film position detector, the first cylinder 41, the second cylinder and the position sensor, so as to improve the stability of system control.

[0041] The implementation principle of the upper and lower film alignment device for the bag making process is as follows: before transverse sealing, the positions of the upper film 102 and the lower film 103 are detected by the plastic film position detector, and signals are transmitted to the controller. At the same time, the displacement sensor continuously detects the positions of the extension shafts of the first air cylinder 41 and the second air cylinder, and signals are transmitted to the controller. The controller calculates the difference between the actual stretching amount and the target stretching amount by using the preset target value, and transmits the signals to the first air cylinder 41 and the second air cylinder. The first air cylinder 41 and the second air cylinder control the upper film pull rod 3 and the lower film pull rod 7 to move up and down, so as to adjust the stretching amount of the upper film 102 and the lower film 103 and eliminate the deviation.

[0042] Embodiment 2

[0043] The difference between the embodiment and the embodiment 1 is that the upper film pull rod 3 is arranged in a detachable structure in the embodiment, which facilitates the assembly of the equipment, and the position of the upper film pull rod 3 connected to the driving plate 42 can be adjusted to adapt to plastic films of different widths. Correspondingly, the lower film pull rod 7 is also arranged in a detachable structure and has the same structure as the upper film pull rod 3, which will be described below by taking the upper film pull rod 3 as an example.

[0044] Referring to Figure 3 and Figure 4 Specifically, in the embodiment, a positioning rod 53 is fixed on the upper end of the connecting rod 5 by integral molding or welding, and the positioning rod 53 is a polygonal rod. In this embodiment, the positioning rod 53 is arranged as a rectangular rod. A positioning hole 421 is formed in the driving plate 42 for the positioning rod 53 to pass through. Preferably, the length of the positioning plate is the same as the thickness of the driving plate 42. Further, the positioning plate is away from the threaded rod 51, and a fixing nut 52 is threadedly connected to the threaded rod 51.

[0045] When the upper film pull rod 3 is installed, the corresponding connecting rod 5 is inserted into the positioning hole 421 from bottom to top, and the upper surface of the connecting rod 5 abuts against the bottom surface of the driving plate 42. At this time, attention should be paid that after the positioning rod 53 cooperates with the positioning hole 421, the length direction of the upper film pull rod 3 is parallel to the width direction of the workbench 1. Then, the threaded rod 51 is fixed by the fixing nut 52, so that the upper film pull rod 3 is fixed.

[0046] Further, the positioning holes 421 are spaced apart along the length direction of the driving plate 42, so that the connecting rods 5 can be connected to different positions, and the two sections of the upper film pull rod 3 that are disconnected from each other can approach or move away from each other to adapt to plastic films of different widths.

[0047] The above are preferred embodiments of the present application, but do not limit the protection scope of the present application. Therefore, equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An upper and lower film alignment device for a bag making process, characterized by: The utility model provides a plastic film automatic feeding device, including workbench (1), first mounting frame (2), upper membrane pull rod (3) and upper membrane drive part (4), first mounting frame (2) sets up on workbench (1), and upper membrane (102) and lower membrane (103) can pass from first mounting frame (2) below, upper membrane pull rod (3) up and down movement sets up on first mounting frame (2), and upper membrane pull rod (3) is inserted in upper membrane (102) with lower membrane (103) between, upper membrane drive part (4) can drive upper membrane pull rod (3) up and down movement.

2. The film aligning device for bag making process of claim 1, wherein: The upper membrane drive part (4) includes a first cylinder (41), and the first cylinder (41) extends downward along an extension shaft and is connected with the upper membrane pull rod (3).

3. The film aligning device for bag making process of claim 2, wherein: The upper membrane drive part (4) further includes a driving plate (42), the driving plate (42) is connected with the extension shaft of the first cylinder (41), and the upper membrane pull rod (3) is connected with the driving plate (42) at both ends.

4. The film aligning device for bag making process of claim 3, wherein: The upper membrane pull rod (3) is divided into two sections in the middle, and the ends of the two sections of the upper membrane pull rod (3) away from each other are provided with a connecting rod (5), and the upper ends of the connecting rods (5) are connected with the driving plate (42).

5. The film aligning device for bag making process of claim 1, wherein: The utility model further includes a second mounting frame (6), a lower membrane pull rod (7) and a lower membrane drive part (8), the second mounting frame (6) is arranged on the workbench (1), the upper membrane (102) and the lower membrane (103) can pass from the top of the second mounting frame (6), the lower membrane pull rod (7) is arranged on the second mounting frame (6) and moves up and down, the lower membrane pull rod (7) is inserted between the upper membrane (102) and the lower membrane (103), and the lower membrane drive part (8) can drive the lower membrane pull rod (7) to move up and down.

6. The film aligning device for bag making process of claim 2, wherein: The utility model further includes a plastic film position detector, a displacement sensor and a controller, the plastic film position detector is used for detecting the positions of the upper membrane (102) and the lower membrane (103), the displacement sensor is arranged at the end of the extension shaft of the first cylinder (41), and the controller is connected with the displacement sensor and the plastic film position detector respectively.

7. The film aligning device for bag making process of claim 4, wherein: The upper end of the connecting rod (5) is provided with a threaded rod (51), the threaded rod (51) is further screwed with a fixing nut (52), the driving plate (42) is provided with a positioning hole (421) for slidingly penetrating the threaded rod (51), after the threaded rod (51) penetrates through the positioning hole (421), the end face of the connecting rod (5) can abut against the driving plate (42).

8. The film aligning device for bag making process of claim 7, wherein: A positioning rod (53) is arranged between the connecting rod (5) and the threaded rod (51), the positioning hole (421) and the positioning rod (53) are cooperatively arranged, when the positioning rod (53) is inserted into the positioning hole (421), the connecting rod (5) is limited to rotate.

9. The film aligning device for bag making process of claim 8, wherein: The positioning hole (421) is spaced apart along the length direction of the driving plate (42).

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