A rapid cutting device for a plastic bag produced by a film blowing machine

Abstract

The utility model discloses a kind of quick cutting device for plastic bag production of blown film machine, belong to plastic bag production device technical field, including base, fixedly connected with mounting bracket on the base;Cutting mechanism, the cutting mechanism includes the sliding block movably connected on mounting bracket, the sliding block is slidably connected with cutting block on, the top of cutting block is rotatably connected with guide wheel, its bottom is fixedly connected with cutting blade, fixedly connected with guide rail on the mounting bracket, the guide wheel is rollingly connected in the bottom of guide rail.In the utility model, by the inclined section design of guide rail, cutting blade is cut into plastic film edge with oblique progressive mode, avoid plastic film to produce tensile deformation, tear or burr due to sudden force, ensure that incision is smooth, improve plastic bag finished product quality;Collinear design of horizontal section and lap section, so that cutting blade keeps stable horizontal cutting posture after cutting into plastic film.

Description

Technical Field

[0001] The utility model belongs to the technical field of plastic bag production devices, and particularly relates to a rapid cutting device for producing plastic bags by a film blowing machine. Background Art

[0002] In the process of producing plastic bags by a film blowing machine, after blow molding, the plastic film needs to go through a cutting process to trim edges or cut into bags with specified widths. Therefore, the performance of the cutting device directly affects the finished product quality and production efficiency of plastic bags. In the prior art, the cutting device matched with a film blowing machine mostly adopts a mode that a blade moves reciprocally along the width direction of the plastic film to realize cutting, and its core structure generally comprises a driving component, a blade and a rotating roller for supporting the plastic film.

[0003] In the prior art, a structure comprising a cutting box, a cutting screw and a double-sided cutting blade is adopted, and the cutting motor drives the screw to drive the blade to translate to realize cutting of the plastic film. In this mode, only a single linear cutting action is achieved, and the plastic film is prone to tensile deformation, tearing or burrs due to sudden stress, which reduces the finished product quality of the plastic bag. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a rapid cutting device for producing plastic bags by a film blowing machine, so as to solve the problem in the conventional art that only a single linear cutting action is achieved, and the plastic film is prone to tensile deformation, tearing or burrs due to sudden stress, which reduces the finished product quality of plastic bags.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: A rapid cutting device for producing plastic bags by a film blowing machine, comprising: a base, wherein a mounting frame is fixedly connected to the base; a cutting mechanism, wherein the cutting mechanism comprises a sliding block movably connected to the mounting frame, a cutting block is slidably connected to the sliding block, a guide wheel is rotatably connected to the top of the cutting block, a cutting blade is fixedly connected to the bottom of the cutting block, a guide rail is fixedly connected to the mounting frame, the guide wheel is rollingly connected to the bottom of the guide rail, both ends of the guide rail are arranged to incline upward, a rotating roller is rotatably connected to the mounting frame, the top of the rotating roller is for the plastic film to wind around, both ends of the guide rail face two edges of the plastic film, and the cutting blade cuts the plastic film along a direction parallel to the axis of the rotating roller.

[0006] Preferably, a cutting motor is mounted on the mounting frame, a threaded rod is coaxially and fixedly connected to an output end of the cutting motor, one end of the threaded rod away from the cutting motor is rotatably connected to the mounting frame, and the sliding block is in threaded connection with the threaded rod.

[0007] Preferably, the sliding block has a through-hole telescopic groove, the cutting block is slidably connected in the vertical direction inside the telescopic groove, and a telescopic spring is fixedly connected between the cutting block and the sliding block.

[0008] Preferably, the rotating roller has multiple blade-relief grooves, and the cutting blade slides in a gap with one of the blade-relief grooves when it moves.

[0009] Preferably, the guide rail includes two inclined sections fixedly connected to the mounting frame, with one adjacent end of each of the two inclined sections inclined toward the center of the rotating roller, and fixedly connected to the same horizontal section, the longitudinal direction of which is parallel to the axial direction of the rotating roller.

[0010] Preferably, the mounting frame has two overlapping sections rotatably connected, with the cantilever ends of the two overlapping sections overlapping each other at both ends of the horizontal section. A return torsion spring is fixedly connected between the bottom of the overlapping section and the mounting frame. The overlapping section is collinear with the horizontal section, and an opening is formed between the end of the overlapping section away from the horizontal section and the mounting frame. The opening is used to allow the guide wheel to move from the overlapping section to the inclined section.

[0011] Compared with the prior art, the present invention has the following beneficial effects: In this invention, the inclined section design of the guide rail allows the cutting blade to cut into the edge of the plastic film in a gradually inclined manner, avoiding stretching deformation, tearing, or rough edges caused by sudden force on the plastic film, ensuring a smooth and flat cut, and improving the quality of the finished plastic bag. The collinear design of the horizontal section and the overlapping section ensures that the cutting blade maintains a stable horizontal cutting posture after cutting into the plastic film. Combined with the uniform movement of the sliding block, continuous and straight cutting of the non-edge section is achieved, avoiding skewed cuts caused by trajectory fluctuations and improving cutting accuracy. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of a rapid cutting device for producing plastic bags using a blown film machine, as proposed in this utility model. Figure 2 This is a vertical sectional view of the mounting frame of a quick cutting device for producing plastic bags using a blown film machine, as proposed in this utility model. Figure 3 This invention presents a schematic diagram of the overlapping section and the return torsion spring structure of a quick cutting device for producing plastic bags using a blown film machine.

[0013] In the diagram: 1. Base; 2. Mounting bracket; 3. Cutting motor; 4. Threaded rod; 5. Sliding block; 6. Telescopic groove; 7. Cutting block; 8. Telescopic spring; 9. Cutting blade; 10. Guide wheel; 11. Guide rail; 12. Inclined section; 13. Horizontal section; 14. Overlapping section; 15. Return torsion spring; 16. Rotating roller; 17. Blade groove. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] Reference Figures 1-3 A rapid cutting device for producing plastic bags using a blown film machine, comprising: Base 1, with mounting bracket 2 fixedly connected to base 1.

[0016] Mounting bracket 2 is vertically fixed above base 1, forming the main frame of the device.

[0017] The cutting mechanism includes a sliding block 5 movably connected to the mounting frame 2, a cutting block 7 slidably connected to the sliding block 5, a guide wheel 10 rotatably connected to the top of the cutting block 7, and a cutting blade 9 fixedly connected to its bottom. A guide rail 11 is fixedly connected to the mounting frame 2, and the guide wheel 10 is rotatably connected to the bottom of the guide rail 11. Both ends of the guide rail 11 are inclined upwards. A rotating roller 16 is rotatably connected to the mounting frame 2. The top of the rotating roller 16 is for wrapping plastic film. Both ends of the guide rail 11 are directly opposite the two edges of the plastic film. The cutting blade 9 cuts the plastic film in a direction parallel to the axis of the rotating roller 16.

[0018] When the guide wheel 10 rolls along the inclined section 12 of the guide rail 11, the cutting block 7 descends, causing the cutting blade 9 to contact the edge of the plastic film to complete the downward cutting. Compared with the cutting blade 9 directly contacting the plastic film, this improves the efficiency of the cutting blade 9 in cutting the plastic film.

[0019] A cutting motor 3 is mounted on the mounting bracket 2. A threaded rod 4 is coaxially fixedly connected to the output end of the cutting motor 3. The end of the threaded rod 4 away from the cutting motor 3 is rotatably connected to the mounting bracket 2. A sliding block 5 is threadedly connected to the threaded rod 4.

[0020] A sliding rod is fixedly connected to the mounting bracket 2, and the sliding block 5 slides through the sliding rod to improve the stability of the movement of the sliding block 5.

[0021] The cutting motor 3 provides power, and through the threaded engagement between the threaded rod 4 and the sliding block 5, the sliding block 5 moves linearly along the axial direction of the threaded rod 4, thereby realizing the reciprocating cutting action of the cutting blade 9 along the axis of the rotating roller 16.

[0022] A telescopic groove 6 is provided through the sliding block 5. The cutting block 7 is slidably connected to the inside of the telescopic groove 6 in the vertical direction. The telescopic groove 6 provides guidance for the vertical sliding of the cutting block 7 to ensure its stable lifting and lowering movement. A telescopic spring 8 is fixedly connected between the cutting block 7 and the sliding block 5.

[0023] When the telescopic spring 8 is in its natural state, it can pull the cutting block 7 upward, so that the guide wheel 10 fits tightly against the bottom of the guide rail 11. When the guide wheel 10 moves down along the inclined section 12 of the guide rail 11, the telescopic spring 8 is compressed, which provides a buffer for the descent of the cutting block 7, and at the same time assists the cutting block 7 to rise and reset when the guide wheel 10 resets.

[0024] The rotating roller 16 has multiple blade grooves 17. When the cutting blade 9 moves, it slides with a blade groove 17, and the cutting blade 9 smoothly cuts into the plastic film to complete the cutting action.

[0025] The guide rail 11 includes two inclined sections 12 fixedly connected to the mounting frame 2. The adjacent ends of the two inclined sections 12 are inclined towards the center of the rotating roller 16, and are fixedly connected to the same horizontal section 13. The longitudinal direction of the horizontal section 13 is parallel to the axial direction of the rotating roller 16.

[0026] The inclined sections 12 at both ends correspond to the two sides of the plastic film, ensuring that the cutting blade 9 moves down accurately to cut when it reaches the edge position. The horizontal section 13 of the guide rail 11 corresponds to the state in which the cutting blade 9 continuously cuts the plastic film.

[0027] Two overlapping sections 14 are rotatably connected to the mounting bracket 2. The cantilever ends of the two overlapping sections 14 overlap one-to-one with the two ends of the horizontal section 13. A reset torsion spring 15 is fixedly connected between the bottom of the overlapping section 14 and the mounting bracket 2. The overlapping section 14 and the horizontal section 13 are collinear. The end of the overlapping section 14 away from the horizontal section 13 forms a passage with the mounting bracket 2. The passage is used to allow the guide wheel 10 to move from the overlapping section 14 to the inclined section 12.

[0028] The mounting bracket 2 has an integrally formed support on its inner side, which is rotatably connected to the overlapping section 14 through the support. The support is fixedly connected to the rotating part of the overlapping section 14 through the return torsion spring 15. Under the elastic force of the return torsion spring 15, the overlapping section 14 abuts against the horizontal section 13.

[0029] The cantilever end of the overlapping section 14 overlaps the end of the horizontal section 13, allowing the guide wheel 10 to smoothly transition from the horizontal section 13 to the overlapping section 14, so that the cutting blade 9 can evenly cut the plastic film, effectively preventing the cutting blade 9 from moving upward along the inclined section 12 at the end of the cutting stroke, and ensuring the stability of the cutting.

[0030] When in operation, the cutting motor 3 is started, and its output end drives the threaded rod 4 to rotate, which in turn drives the sliding block 5 to move in a direction parallel to the axis of the rotating roller 16.

[0031] The sliding block 5 drives the guide wheel 10 to move through the cutting block 7. When the guide wheel 10 moves to the right, it rolls down along the inclined section 12 on the left. The cutting block 7 overcomes the elastic force of the telescopic spring 8 and descends, so that the cutting blade 9 cuts into the edge of the plastic film at an angle, avoiding the plastic film from being stretched or torn due to sudden force. It is suitable for cutting thin plastic films.

[0032] The guide wheel 10 continues to move, overcoming the elastic force of the return torsion spring 15 to push down the left overlapping section 14, and moves to the horizontal section 13 and the right overlapping section 14. During this process, the cutting blade 9 steadily cuts the plastic film.

[0033] After the plastic film is cut, the guide wheel 10 passes through the opening on the right side and, under the elastic force of the telescopic spring 8, lands on the inclined section 12 on the right side, completing the rightward movement.

[0034] When cutting the plastic film again, the output of the cutting motor 3 is controlled to rotate in the opposite direction, and the guide wheel 10 is controlled to complete the leftward movement process, thus completing one cutting operation.

[0035] Repeat the above cutting process to achieve rapid reciprocating cutting of the plastic film.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A rapid cutting device for producing plastic bags using a blown film machine, characterized in that, include: A base (1) is fixedly connected to a mounting bracket (2); The cutting mechanism includes a sliding block (5) movably connected to the mounting frame (2), a cutting block (7) slidably connected to the sliding block (5), a guide wheel (10) rotatably connected to the top of the cutting block (7), and a cutting blade (9) fixedly connected to its bottom. A guide rail (11) is fixedly connected to the mounting frame (2), the guide wheel (10) is slidably connected to the bottom of the guide rail (11), both ends of the guide rail (11) are inclined upwards, a rotating roller (16) is rotatably connected to the mounting frame (2), the top of the rotating roller (16) is for wrapping plastic film, both ends of the guide rail (11) are directly opposite the two edges of the plastic film, and the cutting blade (9) cuts the plastic film in a direction parallel to the axis of the rotating roller (16).

2. The rapid cutting device for producing plastic bags using a blown film machine according to claim 1, characterized in that, A cutting motor (3) is installed on the mounting bracket (2). A threaded rod (4) is coaxially fixedly connected to the output end of the cutting motor (3). The end of the threaded rod (4) away from the cutting motor (3) is rotatably connected to the mounting bracket (2). The sliding block (5) is threadedly connected to the threaded rod (4).

3. The rapid cutting device for producing plastic bags using a blown film machine according to claim 2, characterized in that, The sliding block (5) has a through-hole telescopic groove (6), the cutting block (7) is slidably connected in the vertical direction inside the telescopic groove (6), and a telescopic spring (8) is fixedly connected between the cutting block (7) and the sliding block (5).

4. The rapid cutting device for producing plastic bags using a blown film machine according to claim 1, characterized in that, The rotating roller (16) has multiple blade grooves (17), and the cutting blade (9) slides with a blade groove (17) during movement.

5. A rapid cutting device for producing plastic bags using a blown film machine according to claim 1, characterized in that, The guide rail (11) includes two inclined sections (12) fixedly connected to the mounting frame (2). The two inclined sections (12) are inclined at one end towards the center of the rotating roller (16) and are fixedly connected to the same horizontal section (13). The longitudinal direction of the horizontal section (13) is parallel to the axial direction of the rotating roller (16).

6. A rapid cutting device for producing plastic bags using a blown film machine according to claim 5, characterized in that, Two overlapping sections (14) are rotatably connected to the mounting frame (2). The cantilever ends of the two overlapping sections (14) overlap one-to-one with the two ends of the horizontal section (13). A reset torsion spring (15) is fixedly connected between the bottom of the overlapping section (14) and the mounting frame (2). The overlapping section (14) is collinear with the horizontal section (13). The end of the overlapping section (14) away from the horizontal section (13) forms a passage with the mounting frame (2). The passage is used to allow the guide wheel (10) to move from the overlapping section (14) to the inclined section (12).

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