Plastic film heat sealing and bag cutting device

Abstract

The utility model provides a plastic film heat sealing and bag cutting device which comprises a base, a supporting assembly erected on the base and a pressing assembly arranged above a supporting plate, the supporting assembly comprises a workbench, a guide groove and a lower sliding block, and the plastic film heat sealing and bag cutting device is further provided with a first driving mechanism; a heat sealing bag cutting assembly is further arranged between the workbench and the base, the pressing assembly comprises a connecting plate and a fourth telescopic rod which are arranged above the workbench, two upper sliding blocks and a second driving mechanism are arranged at the bottom of the connecting plate, and air suction cup holes are formed in the lower surfaces of the upper sliding blocks and the upper surfaces of the lower sliding blocks. The upper surface and the lower surface of a plastic film are adsorbed simultaneously through the air suction cup holes formed in the opposite surfaces of the upper sliding block and the lower sliding block, and then the plastic film moves outwards synchronously to be stretched and smoothed, so that the whole plastic film is in a flat and aligned state, and a heat sealing surface and a cutting surface can be kept flat during heat sealing and cutting; and therefore, the processing precision is higher, and the quality of the produced plastic packaging bag is better.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging bag production, in particular to a plastic film heat-sealing and bag-cutting device. Background Art

[0002] Plastic packaging bags are made from plastic and are used to produce a variety of daily necessities. They are widely used in daily life and industrial production. A mixed plastic melt is extruded through an extruder to form a thin film. Different extruder heads and dies can be used to produce films of varying sizes and shapes. The extruded film is then sealed horizontally by a transverse sealing machine to form a cylindrical structure. It is then sealed longitudinally by a longitudinal sealing machine to form the finished bag.

[0003] In the process of forming the bag body after transverse sealing, in order to form a single packaging bag structure with one end closed and sequentially independent, cutting is required immediately adjacent to the seal. This is usually done using a heat-sealing and cutting bag-making machine, and either heat-sealing hot cutting or heat-sealing cold cutting is used depending on the needs. However, existing bag-making machines have some problems when used. They use pressure strips to compress the film, but the contact area between the pressure strips and the film is small, resulting in limited compression and easy indentation. In addition, the film is prone to wrinkles during such compression, affecting processing accuracy.

[0004] Chinese invention patent application number CN115891287A discloses a heat-sealing and cold-cutting bag-making machine, comprising a workbench, a support plate disposed above the workbench, a mounting plate disposed below the support plate, a press plate disposed below the mounting plate, an output end of a driving cylinder connected to the mounting plate, a spring connecting the press plate and the support plate, an upper heat-sealing plate disposed at the bottom of the mounting plate, a through slot for the upper heat-sealing plate to pass through the middle of the press plate, a receiving slot disposed in the workbench, a lifting plate slidably mounted in the receiving slot, a lower heat-sealing plate disposed on top of the lift plate to match the upper heat-sealing plate, and a cutting blade disposed on the right side of the lift plate. The press plate presses the film, and then the upper and lower heat-sealing plates press the film from both sides to perform heat sealing, while the cutting blade rises to complete the cutting of the film. When the upper and lower heat-sealing plates and the cutting blade are reset, the press plate still presses the film, achieving a good anti-adhesion effect and preventing indentations.

[0005] However, the above equipment still has some shortcomings when used. The main one is that the raw material for heat sealing and cutting is a cylindrical double-layer film structure. The roller-shaped pressing plate can only flatten and straighten the film from the top, but cannot fix the bottom layer of film. When stretching and smoothing the top surface, the upper and lower layers of film may shift and become asymmetric, which affects the quality of the packaging bags processed later. Therefore, a better heat sealing and bag cutting device is needed. Utility Model Content

[0006] In response to the shortcomings of the existing technology, the utility model provides a plastic film heat sealing and bag cutting device, which solves the problem in the existing technology that when stretching and smoothing the upper surface, the upper and lower layers of film may be displaced and asymmetric, which affects the quality of the subsequently processed packaging bags.

[0007] According to an embodiment of the utility model, a plastic film heat-sealing and bag-cutting device comprises a base, a support assembly mounted on the base, and a pressing assembly arranged above the support plate, the support assembly comprising a horizontally arranged workbench, the workbench being provided with two front-to-rear adjacent guide grooves along the moving direction of the plastic film, the guide grooves being provided with lower sliders, and the workbench being further provided with a first driving mechanism for driving the lower sliders to reciprocate along the guide grooves; a heat-sealing and bag-cutting assembly being further provided between the workbench and the base, the base being provided with a third telescopic rod for driving the heat-sealing and bag-cutting assembly to move in a vertical direction, and an opening being provided in the middle of the workbench for the heat-sealing and bag-cutting assembly to pass through;

[0008] The pressing assembly includes a connecting plate horizontally arranged directly above the workbench, a fourth vertical telescopic rod is provided on the top of the connecting plate, and the fourth telescopic rod drives the connecting plate to move vertically, closer to or away from the workbench, and two upper sliders are provided at the bottom of the connecting plate, and the upper sliders correspond to the positions of the lower sliders. A cavity is provided inside the connecting plate, and the bottom end of the cavity is connected to the outside through a slot, and a second driving mechanism is provided inside the cavity, and the second driving mechanism drives the upper slider to move synchronously with the lower slider through the slot;

[0009] The lower surface of the upper slider and the upper surface of the lower slider are both provided with air suction cup holes.

[0010] Furthermore, the width of the lower slider corresponds to the guide groove, so that it is just stuck in the guide groove. The first driving mechanism includes a first telescopic rod arranged at the bottom of the workbench. The first telescopic rod is horizontally arranged, and its telescopic direction is parallel to the guide groove. One end of the first telescopic rod is fixedly connected to the bottom surface of the workbench, and the other end is fixedly connected to the bottom surface of the lower slider.

[0011] Furthermore, the second driving mechanism includes a second telescopic rod arranged inside the cavity, the second telescopic rod is arranged horizontally and parallel to the guide groove direction, one end of the second telescopic rod is fixed to the inner wall of the connecting plate located in the cavity, and the other end is connected to a connecting block, and the bottom of the connecting block is connected to the upper slider through the slot.

[0012] Furthermore, the width of the slot is much smaller than the width of the upper slider, so that the upper slider will not enter the cavity. The cross-sectional size of the cavity is adapted to the connecting block, so that the connecting block can only move along the cavity. The bottom end of the connecting block is connected to the upper slider through a hard rod extending through the slot.

[0013] Furthermore, a pressure plate is provided on the bottom surface of the connecting plate at a portion outside the moving range of the upper slider. The thickness of the pressure plate is consistent with that of the upper slider, so that the bottoms thereof are at the same height.

[0014] Furthermore, the heat-sealing and bag-cutting assembly includes a lifting plate, a lower heat-sealing plate and a cutter arranged on the lifting plate, and the corresponding openings arranged on the workbench are just for the heat-sealing plate and the cutter to pass through.

[0015] Furthermore, an upper heat sealing plate and a cutting cavity for a cutter to pass through are correspondingly provided in the middle of the bottom surface of the connecting plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In the utility model, an upper slider and a lower slider that are symmetrical to each other are respectively provided on the upper and lower processing surfaces of the plastic film, and air suction cup holes are respectively provided on the bottom of the upper slider and the top of the lower slider, so that the upper and lower surfaces of the plastic film can be adsorbed at the same time, and then moved outward synchronously to be stretched and smoothed, so that the plastic film as a whole is in a flat and aligned state, and the flatness of the heat-sealing surface and the cutting surface can be maintained during heat sealing and cutting, so that the processing accuracy is higher and the quality of the produced plastic packaging bags is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side cross-sectional schematic diagram of an embodiment of the present utility model.

[0019] Figure 2 Schematic diagram of the upper slider and the lower slider installed on the workbench and the connecting plate in the embodiment of the present invention.

[0020] In the above drawings: 1. base; 2. workbench; 3. connecting plate; 4. lower slider; 5. upper slider; 6. third telescopic rod; 7. fourth telescopic rod; 8. lower heat-sealing plate; 9. cutter; 31. pressing plate; 41. first telescopic rod; 51. second telescopic rod; 52. connecting block; 81. upper heat-sealing plate. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, an embodiment of the utility model proposes a plastic film heat-sealing and bag-cutting device, comprising a base 1, a support assembly mounted on the base 1, and a pressing assembly arranged above the support plate, wherein the support assembly comprises a horizontally arranged workbench 2, and the base 1 supports the workbench 2 above through vertical support rods.

[0023] like Figure 2As shown, two front and rear adjacent guide grooves are provided on the workbench 2 along the moving direction of the plastic film, and a lower slider 4 is provided in the guide groove. The workbench 2 is also provided with a first driving mechanism that drives the lower slider 4 to move back and forth along the guide groove; a heat sealing and cutting bag assembly is also provided between the workbench 2 and the base 1, and a third telescopic rod 6 is provided on the base 1 to drive the heat sealing and cutting bag assembly to move in the vertical direction. An opening is provided in the middle of the workbench 2 for the heat sealing and cutting bag assembly to pass through.

[0024] In a further embodiment, the width of the lower slider 4 corresponds to the guide groove, allowing it to fit snugly within the guide groove. The first drive mechanism includes a first telescopic rod 41 disposed at the bottom of the workbench 2. The first telescopic rod 41 is arranged horizontally, with its telescopic direction parallel to the guide groove. One end of the first telescopic rod 41 is fixedly connected to the bottom surface of the workbench 2, and the other end is fixedly connected to the bottom surface of the lower slider 4. Therefore, the first telescopic rod 41 drives the movement of the lower slider 4 from the bottom without affecting the contact between the upper portion of the lower slider 4 and the plastic film.

[0025] Correspondingly, the pressing assembly includes a connecting plate 3 horizontally arranged just above the workbench 2. A fourth vertical telescopic rod 7 is provided on the top of the connecting plate 3. The fourth telescopic rod 7 drives the connecting plate 3 to move vertically, closer to or away from the workbench 2. Two upper sliders 5 are provided at the bottom of the connecting plate 3. The upper sliders 5 correspond to the positions of the lower sliders 4. A cavity is provided inside the connecting plate 3. The bottom end of the cavity is connected to the outside through a slot. A second driving mechanism is provided inside the cavity. The second driving mechanism drives the upper slider 5 to move synchronously with the lower slider 4 through the slot. Preferably, the second driving mechanism includes a second telescopic rod 51 provided inside the cavity. The second telescopic rod 51 is horizontally arranged and parallel to the direction of the guide groove. One end of the second telescopic rod 51 is fixed to the inner wall of the connecting plate 3 located in the cavity, and the other end is connected to a connecting block 52. The bottom of the connecting block 52 is connected to the upper slider 5 through the slot.

[0026] It should be noted that the width of the slot is much smaller than the width of the upper slider 5, so that the upper slider 5 will not enter the cavity. The cross-sectional size of the cavity is adapted to the connecting block 52, so that the connecting block 52 can only move along the cavity. The bottom end of the connecting block 52 is connected to the upper slider 5 through a hard rod extending through the slot.

[0027] In this embodiment, air suction cup holes are provided on the lower surface of the upper slider 5 and the upper surface of the lower slider 4. These holes are evenly distributed across the surfaces of the upper and lower sliders 5 and 4. Air ducts are provided on the sides of the upper and lower sliders 5 and 4, connecting them to an air pump. The suction force of the air suction cup holes in this embodiment is relatively weak, barely securing the plastic film. Therefore, after suction, the plastic film does not slide along the surfaces of the upper and lower sliders 5 and 4 during movement and stretching, thus preventing damage to the film.

[0028] Furthermore, a pressure plate 31 is provided on the bottom surface of the connecting plate 3, outside the range of movement of the upper slider 5. The thickness of the pressure plate 31 matches that of the upper slider 5, ensuring that their bottoms are at the same height. The pressure plate 31 is located only at the location corresponding to the heat-sealing and bag-cutting assembly. This allows the upper and lower sliders 5 and 4 to be stretched outward from the areas on both sides of the pressure plate 31, ensuring that the heat-sealing and bag-cutting assembly has a certain support surface during operation.

[0029] In this embodiment, the heat-sealing and bag-cutting assembly includes a lifting plate, a lower heat-sealing plate 8 mounted on the lifting plate, and a cutter 9. The corresponding openings provided on the workbench 2 allow the heat-sealing plate and cutter 9 to pass through. Upper heat-sealing plates 81 and cutting cavities for the cutter 9 to pass through are also provided on either side of the pressure plate 31 in the middle of the bottom surface of the connecting plate 3.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A plastic film heat sealing and bag cutting device, characterized by: The invention comprises a base, a support assembly mounted on the base, and a pressing assembly arranged above the support plate, wherein the support assembly comprises a horizontally arranged workbench, wherein the workbench is provided with two front and rear adjacent guide grooves along the moving direction of the plastic film, wherein a lower slider is provided in the guide groove, and the workbench is further provided with a first driving mechanism for driving the lower slider to move back and forth along the guide groove; a heat sealing and cutting bag assembly is further provided between the workbench and the base, wherein a third telescopic rod is provided on the base to drive the heat sealing and cutting bag assembly to move in the vertical direction, and an opening is provided in the middle of the workbench for the heat sealing and cutting bag assembly to pass through; The pressing assembly includes a connecting plate horizontally arranged directly above the workbench, a fourth vertical telescopic rod is provided on the top of the connecting plate, and the fourth telescopic rod drives the connecting plate to move vertically, closer to or away from the workbench, and two upper sliders are provided at the bottom of the connecting plate, and the upper sliders correspond to the positions of the lower sliders. A cavity is provided inside the connecting plate, and the bottom end of the cavity is connected to the outside through a slot, and a second driving mechanism is provided inside the cavity, and the second driving mechanism drives the upper slider to move synchronously with the lower slider through the slot; The lower surface of the upper slider and the upper surface of the lower slider are both provided with air suction cup holes.

2. A plastic film heat-sealing bag cutting device according to claim 1, characterized in that: The width of the lower slider corresponds to the guide groove, so that it is just stuck in the guide groove. The first driving mechanism includes a first telescopic rod arranged at the bottom of the workbench. The first telescopic rod is horizontally arranged, and its telescopic direction is parallel to the guide groove. One end of the first telescopic rod is fixedly connected to the bottom surface of the workbench, and the other end is fixedly connected to the bottom surface of the lower slider.

3. The plastic film heat-sealing and bag-cutting device according to claim 1, characterized in that: The second driving mechanism includes a second telescopic rod arranged inside the cavity, the second telescopic rod is arranged horizontally and parallel to the guide groove direction, one end of the second telescopic rod is fixed to the inner wall of the connecting plate located in the cavity, and the other end is connected to a connecting block, and the bottom of the connecting block is connected to the upper slider through the slot.

4. The plastic film heat-sealing and bag-cutting device according to claim 1, characterized in that: The width of the slot is much smaller than the width of the upper slider, so that the upper slider will not enter the cavity. The cross-sectional size of the cavity is adapted to the connecting block, so that the connecting block can only move along the cavity. The bottom end of the connecting block is connected to the upper slider by a hard rod extending through the slot.

5. The plastic film heat-sealing and bag-cutting device according to claim 1, characterized in that: A pressing plate is further provided on the bottom surface of the connecting plate at a portion outside the moving range of the upper slider. The thickness of the pressing plate is consistent with that of the upper slider so that the bottoms thereof are at the same height.

6. The plastic film heat-sealing and bag-cutting device according to claim 1, characterized in that: The heat sealing and bag cutting assembly comprises a lifting plate, a lower heat sealing plate and a cutter arranged on the lifting plate, and the corresponding openings arranged on the workbench are just for the heat sealing plate and the cutter to pass through.

7. A plastic film heat-sealing and bag-cutting device according to claim 6, characterized in that: An upper heat sealing plate and a cutting cavity for a cutter to pass through are correspondingly provided at the middle of the bottom surface of the connecting plate.

Images