Film splitting and cutting device

Abstract

The utility model provides a thin film splitting and cutting device, and belongs to the technical field of plastic bag production equipment. Comprising a front conveying platform, a rear conveying platform and a cutting unit, the cutting unit is located between the front conveying platform and the rear conveying platform, the rear conveying platform comprises two transmission rollers and a conveying belt pulled by the two transmission rollers, the cutting unit comprises a tool rest and a cutting tool longitudinally connected to the tool rest in a sliding mode, and a swing arm is rotationally connected to the tool rest; a first tension spring is connected between the swing arm and the tool rest, the connecting point of the first tension spring and the hinge point of the swing arm are located on the two sides of the cutting tool respectively, and a pressing roller is rotationally connected to the swing arm and can abut against the straight section of the upper portion of the conveying belt. The cutting device has the advantages of reliable separation after cutting and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of plastic bag production equipment and relates to a film cutting device. Background Art

[0002] During the plastic bag production process, the film is continuously pulled through the process of folding, heat sealing and cutting. During the cutting process, a small amount of unconnected parts still exist after the film is cut, and the existing cutting device cannot reliably separate the cut parts visually. Therefore, the stacking process after cutting often fails due to the lack of connection between adjacent plastic bags, or requires manual pulling to separate them after cutting. Utility Model Content

[0003] The purpose of the utility model is to provide a film cutting device in view of the above problems existing in the prior art. The technical problem to be solved by the utility model is how to achieve complete separation of plastic bags after cutting.

[0004] The objectives of the utility model can be achieved through the following technical solutions: A film cutting device, characterized in that it includes a front conveying platform, a rear conveying platform and a cutting unit, the cutting unit is located between the front conveying platform and the rear conveying platform, the rear conveying platform includes two drive rollers and a conveyor belt pulled by the two drive rollers, the cutting unit includes a knife holder and a cutting knife longitudinally slidably connected to the knife holder, a swing arm is rotatably connected to the knife holder, a tension spring 1 is connected between the swing arm and the knife holder, the connection point of the tension spring 1 and the hinge point of the swing arm are respectively located on both sides of the cutting knife, a pressure roller is rotatably connected to the swing arm, and the pressure roller can press against the upper straight section of the conveyor belt.

[0005] Furthermore, it also includes a tensioning arm, one end of which is hinged on the frame of the cutting device, and the other end of the tensioning arm is rotatably connected to a tensioning roller, and a tension spring 2 is connected between the tensioning roller and the frame of the cutting device to drive the tensioning roller to tension the conveyor belt.

[0006] During operation, as the cutting blade moves downward longitudinally, it can drive the swing arm to swing around the hinge point, thereby driving the pressure roller to act on the upper straight section of the conveyor belt, so that the plastic bag on the conveyor belt can be pressed downward. During the pressing process, the cut plastic bag forms a tensile force between the plastic film in front and the uncut plastic film, thereby breaking the cut plastic bag. As the cutting blade moves upward, the swing arm resets, restoring the straight state of the upper straight section of the conveyor belt. The next plastic bag can enter the rear conveyor platform from the front conveyor platform, and this process is repeated, so that the cut plastic bag is separated after each cut. Due to the flexible connection between the swing arm and the cutting blade, the breaking force on the plastic bag is relatively gentle, avoiding strain or large stretching of the plastic bag before cutting, thus ensuring the reliability of the separation of the plastic bag after cutting. This solution can be used for plastic bag cutting operations as well as for film segmentation operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a structural schematic diagram of the film cutting device.

[0008] In the figure, 1. Front conveying platform; 2. Rear conveying platform; 3. Drive roller; 4. Conveyor belt; 5. Cutting knife; 6. Swing arm; 7. Tension spring 1; 8. Pressure roller; 9. Tension arm; 10. Tension roller; 11. Tension spring 2. DETAILED DESCRIPTION

[0009] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0010] like Figure 1 The film cutting device shown includes a front conveying platform (1), a rear conveying platform (2) and a cutting unit. The cutting unit is located between the front conveying platform (1) and the rear conveying platform (2). The rear conveying platform (2) includes two drive rollers (3) and a conveyor belt (4) pulled by the two drive rollers (3). The cutting unit includes a knife holder and a cutting knife (5) longitudinally slidably connected to the knife holder. A swing arm (6) is rotatably connected to the knife holder. A tension spring (7) is connected between the swing arm (6) and the knife holder. The connection point of the tension spring (7) and the hinge point of the swing arm (6) are respectively located on both sides of the cutting knife (5). A pressure roller (8) is rotatably connected to the swing arm (6). The pressure roller (8) can press against the upper straight section of the conveyor belt (4).

[0011] The invention also includes a tensioning arm (9), one end of which is hinged on the frame of the cutting device, and the other end of which is rotatably connected to a tensioning roller (10), and a tension spring (11) is connected between the tensioning roller (10) and the frame of the cutting device to drive the tensioning roller (10) to tension the conveyor belt (4).

[0012] During operation, when the cutting knife (5) moves downward longitudinally, the swing arm (6) can be driven to swing around the hinge point, thereby driving the pressure roller (8) to act on the upper straight section of the conveyor belt (4), so that the plastic bag on the conveyor belt (4) can be pressed downward. During the pressing process, the cut plastic bag forms a pulling force between the plastic film and the front uncut plastic film, thereby achieving the breaking of the cut plastic bag. During the upward movement of the cutting knife (5), the swing arm (6) is reset to restore the straight state of the upper straight section of the conveyor belt (4), and the next plastic bag can enter the rear conveyor platform (2) from the front conveying platform (1). This is repeated, so that the cut plastic bag is broken and separated once after each cutting. Since the swing arm (6) and the cutting knife (5) are flexibly connected, the breaking force on the plastic bag is relatively gentle, avoiding injury or a large stretching of the plastic bag before cutting, thereby ensuring the reliability of separation of the cut plastic bag.

[0013] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A film cutting device, characterized in that: The invention comprises a front conveying platform (1), a rear conveying platform (2) and a cutting unit, wherein the cutting unit is located between the front conveying platform (1) and the rear conveying platform (2), the rear conveying platform (2) comprises two transmission rollers (3) and a conveyor belt (4) pulled by the two transmission rollers (3), the cutting unit comprises a knife frame and a cutting knife (5) longitudinally slidably connected to the knife frame, a swing arm (6) is rotatably connected to the knife frame, a tension spring (7) is connected between the swing arm (6) and the knife frame, the connection point of the tension spring (7) and the hinge point of the swing arm (6) are respectively located on both sides of the cutting knife (5), the swing arm (6) is rotatably connected to a pressure roller (8), and the pressure roller (8) can press against the upper straight section of the conveyor belt (4).

2. A film cutting device according to claim 1, characterized in that: The invention also includes a tensioning arm (9), one end of which is hinged on the frame of the cutting device, and the other end of which is rotatably connected to a tensioning roller (10), and a tension spring (11) is connected between the tensioning roller (10) and the frame of the cutting device to drive the tensioning roller (10) to tension the conveyor belt (4).

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