Plastic film cutting device

Abstract

The plastic film cutting device comprises a bottom plate, a machine box, a conveying mechanism and a cutting mechanism, the conveying mechanism and the cutting mechanism are arranged in the machine box, the conveying mechanism comprises a rotating roller rotationally arranged at an opening in one end of the machine box, a first electric push rod is arranged on the top wall, over the rotating roller, of the machine box, and a positioning roller is arranged below the first electric push rod; the cutting mechanism comprises a positioning box horizontally arranged at an opening in the other end of the case, a second electric push rod is arranged over the positioning box, a limiting plate is fixed to the end of a telescopic rod of the second electric push rod, and a cutting blade is arranged at the bottom end of the limiting plate; a plastic film is pressed through rolling of the positioning roller and the rotating roller, one end of the plastic film is adsorbed and fixed through suction force generated by the positioning box, so that the plastic film is flatly fixed, the pressing plate is in contact and fixed firstly when the cutting blade downwards cuts the plastic film, the cutting blade moves upwards firstly after cutting is completed, and the pressing plate still presses the plastic film. And the plastic film cannot be driven by the cutting blade to get up and deform.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic film processing equipment, in particular to a plastic film cutting device. Background Art

[0002] Plastic film is a film made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins, used for packaging and as a coating layer. Plastic packaging and plastic packaging products occupy an increasingly large share in the market, especially composite plastic flexible packaging, which has been widely used in food, medicine, chemical industry and other fields, among which food packaging accounts for the largest proportion, such as beverage packaging, frozen food packaging, steamed food packaging, fast food packaging, etc. These products have brought great convenience to people's lives.

[0003] In the process of plastic film processing, plastic film needs to be cut. Common cutting devices need to ensure that the plastic film is flat and fixed without wrinkles before cutting. Since the plastic film is large in area and very soft and light, it is very time-consuming and laborious for workers to fully unfold the plastic film and fix it flat. In addition, since the plastic film is stretchable and very thin, after manual or machine cutting, when the cutting blade is lifted, the plastic film will rise and generate tension, which may cause deformation of the plastic film and affect the flatness of the cut. For this reason, we propose a plastic film cutting device. Utility Model Content

[0004] The problem to be solved by the utility model is that the plastic film is difficult to be flat and fixed before cutting, and is easy to be deformed after cutting, thus affecting the flatness of the cut.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a plastic film cutting device, which includes a bottom plate, a chassis arranged on the bottom plate, and a transport mechanism and a cutting mechanism arranged in the chassis, the transport mechanism includes a rotating roller rotatably arranged at an opening at one end of the chassis, a first electric push rod is arranged on the top wall of the chassis just above the rotating roller, a stopper is arranged at the end of the telescopic rod of the first electric push rod, the end of the telescopic rod of the first electric push rod is slidably arranged in a buffer tube of a hollow cylindrical structure, a first spring is arranged in the buffer tube, and the buffer A movable frame is provided at the bottom end of the cylinder, and a positioning roller is rotatably provided on the movable frame. The cutting mechanism includes a positioning box horizontally arranged at the opening at the other end of the chassis. The positioning box is a hollow rectangular structure, and limit rods are erected on both sides of the top of the positioning box. A second electric push rod is provided on the top wall of the chassis just above the positioning box, and a limit plate is fixed to the end of the telescopic rod of the second electric push rod. First limit holes are respectively opened at positions corresponding to the two limit rods on both sides of the limit plate, and the two limit rods slide through the first limit holes respectively, and a cutting blade is provided at the bottom end of the limit plate.

[0006] As a preferred solution of the plastic film cutting device described in the utility model, wherein: mounting plates are symmetrically arranged on the side walls of the chassis close to the rotating roller, bearing seats are relatively arranged between the two mounting plates, mounting tubes are respectively fixed in the inner rings of the two bearing seats, a winding roller is arranged between the two mounting tubes, and the end of the winding roller is slidably arranged in the two mounting tubes.

[0007] As a preferred solution of the plastic film cutting device of the utility model, a threaded hole is provided at the top of one of the two mounting tubes, a threaded rod is threadedly connected to the threaded hole, and a handle is provided at the top of the threaded rod.

[0008] As a preferred solution of the plastic film cutting device described in the utility model, a long strip groove is opened at a position in the middle of the top of the positioning box corresponding to the cutting blade, and a rubber pad flush with the top of the positioning box is arranged in the long strip groove.

[0009] As a preferred solution of the plastic film cutting device described in the utility model, wherein: the top of the positioning box is located on both sides of the long strip groove and is evenly distributed with a plurality of first suction holes connected to the interior of the positioning box, the side wall of the positioning box is provided with a plurality of second suction holes, and a negative pressure fan is arranged on the bottom plate, and the negative pressure fan is connected to the bottom end of the positioning box through a negative pressure air duct.

[0010] As a preferred solution of the plastic film cutting device described in the utility model, wherein: a pressure plate is arranged under the limit plate, a long strip through hole is opened at the position of the pressure plate corresponding to the rubber pad, limit columns are respectively arranged on both sides of the pressure plate, second limit holes are respectively opened at the positions of the limit plate corresponding to the two limit columns, the two limit columns respectively pass through the two second limit holes, limit blocks are arranged on the top of the two limit columns, and the outer wall of the limit column located between the limit plate and the pressure plate is sleeved with a second spring.

[0011] The beneficial effects of the utility model are as follows: the utility model can roll and press one end of the plastic film through the positioning roller and the rotating roller, while the other end of the plastic film is adsorbed and fixed by the suction force generated by the positioning box, so that the plastic film is fixed flatly; when the cutting blade cuts the plastic film downward, the pressing plate first contacts and fixes the plastic film, further fixes the position of the plastic film, and makes the incision smoother; after the cutting is completed, the cutting blade moves upward first, while the pressing plate still presses the plastic film at this time, to ensure that the plastic film will not be lifted up by the cutting blade and deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0013] Figure 1 The figure is an overall structural diagram of a plastic film cutting device.

[0014] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0015] Figure 3 A schematic diagram of a plastic film cutting device from another perspective.

[0016] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0017] Figure 5 The figure is a schematic diagram of the internal structure of a chassis of a plastic film cutting device.

[0018] Figure 6 The figure is a schematic diagram of the internal structure of a buffer cylinder of a plastic film cutting device. DETAILED DESCRIPTION

[0019] The utility model is specifically introduced below in conjunction with the accompanying drawings and embodiments.

[0020] Reference Figures 1 to 6 The present embodiment is a plastic film cutting device, comprising a bottom plate 1, a chassis 2 arranged on the bottom plate 1, and a transport mechanism 3 and a cutting mechanism 4 arranged in the chassis 2, wherein the transport mechanism 3 comprises a rotating roller 3a rotatably arranged at an opening at one end of the chassis 2, a first electric push rod 3b is arranged on the top wall of the chassis 2 just above the rotating roller 3a, a stopper 3b-1 is arranged at the end of the telescopic rod of the first electric push rod 3b, the end of the telescopic rod of the first electric push rod 3b is slidably arranged in a buffer tube 3c of a hollow cylindrical structure, a first spring 3d is arranged in the buffer tube 3c, a movable frame 3e is arranged at the bottom end of the buffer tube 3c, and a movable frame 3e is arranged at the bottom end of the movable frame 3e. A positioning roller 3f is rotatably arranged on the frame 3e, and the cutting mechanism 4 includes a positioning box 4a horizontally arranged at the opening at the other end of the chassis 2. The positioning box 4a is a hollow rectangular structure, and limiting rods 4b are respectively erected on both sides of the top of the positioning box 4a. A second electric push rod 4c is arranged on the top wall of the chassis 2 just above the positioning box 4a, and a limiting plate 4d is fixed to the end of the telescopic rod of the second electric push rod 4c. First limiting holes 4d-1 are respectively opened at positions on both sides of the limiting plate 4d corresponding to the two limiting rods 4b, and the two limiting rods 4b slide through the first limiting holes 4d-1 respectively, and a cutting blade 4e is arranged at the bottom of the limiting plate 4d.

[0021] One end of the plastic film passes through the gap between the rotating roller 3a and the positioning roller 3f, and the first electric push rod 3b is turned on. The first electric push rod 3b pushes the positioning roller 3f on the movable frame 3e to press the plastic film. The position where the plastic film needs to be cut is placed flat on the positioning box 4a, and the plastic film is pulled to make it taut. The second electric push rod 4c is turned on, and the second electric push rod 4c drives the cutting blade 4e at the bottom end of the limit plate 4d to cut the plastic film at the top end of the positioning box 4a.

[0022] In this embodiment, mounting plates 5 are symmetrically arranged on the side walls of the chassis 2 close to the rotating roller 3a, bearing seats 5a are relatively arranged between the two mounting plates 5, mounting tubes 5b are respectively fixed in the inner rings of the two bearing seats 5a, a winding roller 5c is arranged between the two mounting tubes 5b, and the end of the winding roller 5c is slidably arranged in the two mounting tubes 5b.

[0023] After the plastic film is cut, the winding roller 5c wound with the plastic film can be quickly replaced by inserting both ends of the winding roller 5c into the mounting tube 5b.

[0024] In this embodiment, a threaded hole 5b-1 is provided at the top of one of the two mounting tubes 5b, a threaded rod 5b-2 is internally threadedly connected to the threaded hole 5b-1, and a handle 5b-3 is provided at the top of the threaded rod 5b-2.

[0025] When replacing the winding roller 5c wrapped with plastic film, insert the two ends of the winding roller 5c into the mounting tube 5b respectively, rotate the handle 5b-3, so that the threaded rod 5b-2 is screwed into the mounting tube 5b and supports the winding roller 5c, so that the position of the winding roller 5c is fixed to prevent the plastic film on the winding roller 5c from shifting when pulling.

[0026] In this embodiment, a long strip groove 4a-1 is provided at the middle of the top of the positioning box 4a corresponding to the cutting blade 4e, and a rubber pad 4a-2 flush with the top of the positioning box 4a is provided in the long strip groove 4a-1.

[0027] When the cutting blade 4e moves downward, the cutting blade 4e cuts the plastic film on the rubber pad 4a-2.

[0028] In this embodiment, a plurality of first suction holes 4a-3 connected to the interior of the positioning box 4a are evenly distributed on both sides of the long strip groove 4a-1 at the top of the positioning box 4a, a plurality of second suction holes 4a-4 are opened on the side wall of the positioning box 4a, and a negative pressure fan 6 is arranged on the bottom plate 1, and the negative pressure fan 6 is connected to the bottom end of the positioning box 4a through a negative pressure air duct 6a.

[0029] When the plastic film is placed flat on the top of the positioning box 4a, the negative pressure fan 6 is turned on. The negative pressure fan 6 generates suction to the inside of the positioning box 4a through the negative pressure air duct 6a. The plastic film is sucked and fixed by the first suction hole 4a-3. At this time, the second suction hole 4a-4 can prevent the negative pressure air duct 6a from being blocked and causing damage to the motor in the negative pressure fan 6.

[0030] In this embodiment, a pressure plate 4f is arranged below the limiting plate 4d, and a long strip through hole 4f-1 is opened at the position of the pressure plate 4f corresponding to the rubber pad 4a-2, and limiting columns 4f-2 are respectively arranged on both sides of the pressure plate 4f. Second limiting holes 4d-2 are respectively opened at the positions of the limiting plate 4d corresponding to the two limiting columns 4f-2, and the two limiting columns 4f-2 pass through the two second limiting holes 4d-2 respectively. Limiting blocks 4f-3 are arranged at the top of the two limiting columns 4f-2, and the outer wall of the limiting column 4f-2 located between the limiting plate 4d and the pressure plate 4f is sleeved with a second spring 4f-4.

[0031] When the telescopic rod controlling the second electric push rod 4c moves downward, the limit plate 4d moves downward, and the pressure plate 4f first presses the plastic film to be cut to further fix the plastic film. The limit plate 4d continues to move downward and compresses the second spring 4f-4 until the cutting blade 4e finishes cutting the plastic film. After the cutting is completed, the cutting blade 4e moves upward first, and the pressure plate 4f still presses the plastic film at this time to ensure that the plastic film will not be lifted up by the cutting blade 4e and deformed.

[0032] Working principle: one end of the plastic film wound on the winding roller 5c is passed through the gap between the rotating roller 3a and the positioning roller 3f until the plastic film is placed flat on the positioning box 4a at the position where it needs to be cut, and the first electric push rod 3b is turned on. The first electric push rod 3b pushes the positioning roller 3f on the movable frame 3e to press the plastic film, and the negative pressure fan 6 is turned on. The negative pressure fan 6 generates suction to the inside of the positioning box 4a through the negative pressure air duct 6a, and the plastic film is sucked and fixed by the first suction hole 4a-3. The second electric push rod 4c is turned on, and the second electric push rod 4c drives the limit plate 4d to move downward. The pressure plate 4f first presses the plastic film to be cut to further fix the plastic film. The limit plate 4d continues to move downward and compresses the second spring 4f-4 until the cutting blade 4e completes cutting the plastic film. After cutting, the cutting blade 4e moves upward first, and the pressure plate 4f still presses the plastic film at this time to ensure that the plastic film will not be driven up by the cutting blade 4e and deformed.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit 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 cutting device, characterized in that: The invention comprises a bottom plate (1), a chassis (2) arranged on the bottom plate (1), and a transport mechanism (3) and a cutting mechanism (4) arranged in the chassis (2); the transport mechanism (3) comprises a rotating roller (3a) rotatably arranged at an opening at one end of the chassis (2); a first electric push rod (3b) is arranged on the top wall of the chassis (2) directly above the rotating roller (3a); a stopper (3b-1) is arranged at the end of a telescopic rod of the first electric push rod (3b); the end of the telescopic rod of the first electric push rod (3b) is slidably arranged in a buffer cylinder (3c) of a hollow cylindrical structure; a first spring (3d) is arranged in the buffer cylinder (3c); a movable frame (3e) is arranged at the bottom end of the buffer cylinder (3c); a rotating frame (3e) is arranged on the movable frame (3e); The cutting mechanism (4) is provided with a positioning roller (3f) at a horizontal position at the opening of the other end of the chassis (2); the positioning box (4a) is a hollow rectangular parallelepiped structure; limiting rods (4b) are respectively erected on both sides of the top of the positioning box (4a); a second electric push rod (4c) is provided on the top wall of the chassis (2) directly above the positioning box (4a); a limiting plate (4d) is fixed to the end of the telescopic rod of the second electric push rod (4c); first limiting holes (4d-1) are respectively provided at positions on both sides of the limiting plate (4d) corresponding to the two limiting rods (4b); the two limiting rods (4b) respectively slide through the first limiting holes (4d-1); and a cutting blade (4e) is provided at the bottom of the limiting plate (4d).

2. A plastic film cutting device as claimed in claim 1, characterized in that: Mounting plates (5) are symmetrically arranged on the outer wall of the chassis (2) close to the rotating roller (3a), a bearing seat (5a) is arranged opposite to the two mounting plates (5), mounting tubes (5b) are respectively fixed in the inner rings of the two bearing seats (5a), a winding roller (5c) is arranged between the two mounting tubes (5b), and the end of the winding roller (5c) is slidably arranged in the two mounting tubes (5b).

3. A plastic film cutting device as claimed in claim 2, characterized in that: A threaded hole (5b-1) is provided at the top end of one of the two mounting tubes (5b); a threaded rod (5b-2) is internally threadedly connected to the threaded hole (5b-1); and a handle (5b-3) is provided at the top end of the threaded rod (5b-2).

4. A plastic film cutting device as claimed in claim 1, characterized in that: A long strip groove (4a-1) is provided at a position in the middle of the top end of the positioning box (4a) corresponding to the cutting blade (4e), and a rubber pad (4a-2) flush with the top end of the positioning box (4a) is provided in the long strip groove (4a-1).

5. A plastic film cutting device as claimed in claim 4, characterized in that: A plurality of first suction holes (4a-3) connected to the interior of the positioning box (4a) are evenly distributed on both sides of the long strip groove (4a-1) at the top of the positioning box (4a); a plurality of second suction holes (4a-4) are opened on the side wall of the positioning box (4a); a negative pressure fan (6) is arranged on the bottom plate (1); and the negative pressure fan (6) is connected to the bottom end of the positioning box (4a) through a negative pressure air duct (6a).

6. A plastic film cutting device as claimed in claim 5, characterized in that: A pressure plate (4f) is arranged below the limit plate (4d); a long strip through hole (4f-1) is provided at a position of the pressure plate (4f) corresponding to the rubber pad (4a-2); limit posts (4f-2) are provided on both sides of the pressure plate (4f); second limit holes (4d-2) are provided at positions of the limit plate (4d) corresponding to the two limit posts (4f-2); the two limit posts (4f-2) pass through the two second limit holes (4d-2) respectively; limit blocks (4f-3) are provided at the top ends of the two limit posts (4f-2); and a second spring (4f-4) is sleeved on the outer wall of the limit post (4f-2) located between the limit plate (4d) and the pressure plate (4f).

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