An automatic film cutting method for an all-plastic film unpacking machine

Abstract

This invention discloses an automatic film cutting method for an all-plastic film unpacking machine. The cutter repeatedly cuts the packaging material with welded joints. The repeated cutting action involves the cutter advancing clockwise or counterclockwise from the side of the packaging material. The cutter path AB is set to a fixed position on the packaging material with welded joints. The cutter repeatedly cuts across AB to achieve repeated film cutting and complete the cutting of the outer plastic film. This invention has the advantages of improving the success rate of cutting the outer plastic film and facilitating subsequent unpacking.

Description

Technical Field

[0001] This invention relates to the field of food and pharmaceutical packaging technology, and specifically to an automatic film cutting method for an all-plastic film unpacking machine. Background Technology

[0002] like Figure 1 As shown, the finished materials are neatly arranged inside the packaging box. The packaging box is usually made of cardboard or polyethylene plastic sheet of a certain thickness, and the entire packaging box is wrapped with a plastic film. When unpacking with a full plastic film unpacking machine, the outer plastic film of the packaging material needs to be cut at the film cutting station first, and then the packaging material is transported to the unpacking station for unpacking. However, when the plastic film is heat-sealed, weld knots will form. The existing film cutting method is to cut around the outer plastic film directly with the cutter, which carries the risk of not being able to cut through the weld knots, making it impossible to guarantee the success rate of film cutting and hindering subsequent unpacking. In addition, if a large part of the blade tip is exposed, the cut to the packaging material is relatively deep, which can easily damage the packaging material. Moreover, after the blade cuts through the plastic tray, the blade tip comes into contact with the glass bottle, which will have an adverse effect on the durability of the cutting blade and the appearance of the bottle. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an automatic film cutting method for an all-plastic film unpacking machine that improves the success rate of cutting the outer plastic film and facilitates subsequent unpacking.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] An automatic film cutting method for an all-plastic film unpacking machine involves a cutter repeatedly cutting the packaging material with welded joints. The repeated film cutting action of the cutter is as follows: the cutter path at a fixed position on the packaging material with welded joints is set as AB, the cutter is controlled to move forward from the side of the packaging material in a clockwise or counterclockwise direction to cut the film, and the cutter is controlled to repeatedly cut through AB to achieve repeated film cutting and complete the cutting of the outer plastic film.

[0006] As a further improvement to the above technical solution: if a welded joint is encountered during the film cutting process, the cutter will first cut through AB repeatedly, then resume forward film cutting until it returns to the starting point, and then cut the film for the next packaging material.

[0007] As a further improvement to the above technical solution: when repeatedly cutting the welded joint, the cutter starts from A and cuts to B, then retracts to A and cuts from A to B again and continues to move forward.

[0008] As a further improvement to the above technical solution: when retracting the blade, the blade retracts outward so that the blade edge does not come into contact with the outer plastic film during the retraction process.

[0009] As a further improvement to the above technical solution: set the quantity of packaging materials, control the cutter to perform a single circumferential cut on the set quantity of packaging materials, and perform a repeated film cutting action on the packaging materials after the set quantity. The single circumferential cut action is: control the cutter to cut the packaging materials around one circle, and do not repeatedly cut through the cutter path AB during the circumferential cut process.

[0010] As a further improvement to the above technical solution: the method for determining the set quantity of the packaging material is as follows: take a packaging material sample, and the cutter performs a single circumferential cutting action on the packaging material sample in sequence. When the cutter performs a single circumferential cutting action on the b-th sample packaging material, it cannot completely cut the outer plastic film. Then the blade wear of the cutter reaches the critical value, and the number of packaging materials that can be cut by a single circumferential cutting action is b-1, which is the set quantity.

[0011] As a further improvement to the above technical solution: the cutter is mounted on a cutter holder, and the cutter holder is provided with a limiting member for restricting the contact between the cutter and the material inside the packaging material.

[0012] As a further improvement to the above technical solution: the limiting member is a roller, and the roller is rotatably mounted on the tool holder.

[0013] As a further improvement to the above technical solution: the blade holder is hinged to the connecting seat, and an elastic element is provided between the two, and the connecting seat is connected to the film cutting robot.

[0014] As a further improvement to the above technical solution: the elastic element is a spring.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] The automatic film cutting method of the all-plastic film unpacking machine disclosed in this invention sets the cutting path AB at a fixed position on the packaging material with welded joints, and controls the cutter to repeatedly cut through AB during the film cutting process. It can be applied to the automatic film cutting of batch packaging materials. Compared with the cutter only cutting around the outer plastic film once, this repeated film cutting method can avoid the risk of welded joints not being cut, improve the success rate of cutting the outer plastic film, and facilitate subsequent unpacking. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the packaging material used in the automatic film cutting method of the all-plastic film unpacking machine of the present invention.

[0018] Figure 2 This is a top view of the packaging material.

[0019] Figure 3 This is a three-dimensional structural diagram of the cutter, cutter holder, and connecting seat used in the automatic film cutting method of the all-plastic film unpacking machine of the present invention.

[0020] Figure 4This is a top view of the cutter, cutter holder, and connecting seat used in the automatic film cutting method of the all-plastic film unpacking machine of the present invention (a represents the contact position of the roller surface, and b represents the actual position reached by the cutter tip).

[0021] Figure 5 This is a three-dimensional structural diagram of the film cutting station.

[0022] The labels in the diagram represent: 1. Cutter; 2. Packaging material; 3. Welded joint; 4. Cutter holder; 5. Limiting component; 6. Film cutting robot; 7. Connecting seat; 8. Elastic component. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] Figures 2 to 5 An embodiment of the present invention is shown. The automatic film cutting method of the all-plastic film unpacking machine in this embodiment involves cutting the packaging material 2 with welded joints 3 using a cutter 1. The cutter path with the welded joints 3 at a fixed position on the packaging material 2 is set as AB. The cutter 1 is controlled to advance from the side of the packaging material 2 in a clockwise or counterclockwise direction to cut the film. The cutter 1 is also controlled to repeatedly cut through AB to achieve repeated film cutting and complete the cutting of the outer plastic film.

[0027] The automatic film cutting method of this all-plastic film unpacking machine sets the cutting path of the fixed position of the welded joint 3 on the packaging material 2 as AB, and controls the cutter 1 to repeatedly cut through AB during the film cutting process. It can be applied to the automatic film cutting of batch packaging materials 2. Compared with the cutter 1 only cutting around the outer plastic film once, this repeated film cutting method can avoid the risk of the welded joint 3 not being cut, improve the success rate of cutting the outer plastic film, and facilitate subsequent unpacking.

[0028] In this embodiment, if a weld joint 3 is encountered during the film cutting process, the cutter 1 first repeats the cutting of AB, then resumes forward cutting until it returns to the starting point, and then cuts the next packaging material 2. This ensures that each weld joint 3 on each packaging material 2 can be successfully cut during the film cutting process, and then sent to the unpacking station for unpacking, which helps to ensure process continuity. Of course, in other embodiments, each packaging material 2 can be cut circumferentially first, and then returned to repeat the cutting of AB, but this method has requirements on the movement range of the cutter 1, which is difficult to implement in actual production.

[0029] In this embodiment, when repeatedly cutting the fusion joint 3, the cutter 1 starts from point A and cuts to point B, then retracts to point A and cuts from point A to point B again and continues to move forward.

[0030] In this embodiment, during the retraction process, the cutter 1 retracts outwards to prevent its blade from contacting the outer plastic film. This provides a degree of protection for the blade and extends its service life.

[0031] The following example illustrates the cutting path of this film cutting method, such as... Figure 2 As shown, packaging material 2 includes a set of long sides and a set of short sides arranged opposite each other. Welded joints 3 are distributed at both ends of the long sides. For ease of explanation, the cutting paths of the welded joints 3 on the long sides are marked as AB, A1B1, A2B2, and A3B3, respectively. The two ends of the short sides are marked as CDEF. The cutting path is as follows: 1) Cutter 1 cuts in from A and moves towards B; 2) After reaching B, cutter 1 retracts outwards, returns to the vicinity of A, and then repeats the cutting from A to B, moving forward and cutting through C, D, A1, and B1; 3) Reaching... After B1, cutter 1 retracts outward and returns to the vicinity of A1, then repeats the cutting from A1 to B1, and moves forward to cut through A2 and B2; 4) After reaching B2, cutter 1 retracts outward and returns to the vicinity of A2, then repeats the cutting from A2 to B2, and moves forward to cut through E, F, A3, and B3; 5) After reaching B3, cutter 1 retracts outward and returns to the vicinity of A3, then repeats the cutting from A3 to B3, and moves forward to cut back to the starting point A, retracts from point A, and returns to the waiting position, thus completing the cutting of the outer plastic film.

[0032] In this embodiment, a set number of packaging materials 2 is set, and the cutter 1 is controlled to perform a single circumferential cut on the set number of packaging materials 2. The subsequent packaging materials 2 are then subjected to repeated cutting. The single circumferential cut involves the cutter 1 cutting around the packaging material 2 in one revolution, without repeatedly cutting along the cutting path AB. Initially, the blade of the cutter 1 is very sharp, and a single circumferential cut is sufficient to cut the outer plastic film. At this point, repeated cutting is unnecessary. Only when the blade wear of the cutter 1 reaches the critical wear level is a second cut performed. This ensures a high success rate in cutting the outer plastic film and also improves the cutting speed.

[0033] In this embodiment, a sample of packaging material 2 is taken, and the cutter 1 performs a single circumferential cut on the sample of packaging material 2 in sequence. When the cutter 1 performs a single circumferential cut on the b-th sample of packaging material 2, it cannot completely cut through the outer plastic film. Therefore, the wear of the cutter 1's blade reaches a critical value, and the number of packaging materials 2 that can be cut through in a single circumferential cut is b-1, which is the set quantity. Preferably, to ensure the accuracy and stability of the set quantity, multiple sampling experiments can be conducted to obtain multiple values ​​of the set quantity, and then the average value is taken. In this embodiment, the cutter 1 is mounted on a cutter holder 4, and the cutter holder 4 is provided with a limiting member 5 to restrict the contact between the cutter 1 and the material inside the packaging material 2. Figure 4 As shown, the distance between ab is less than the thickness of the outer shell of the packaging material 2. During the film cutting process, the limiting member 5 abuts against the outer surface of the packaging material 2, restricting the position of the blade tip of the cutter 1, ensuring that the blade tip of the cutter 1 will not cut through the packaging material 2 and cut the material, thus playing a protective role.

[0034] In this embodiment, the limiting member 5 is a roller, which is rotatably mounted on the cutter holder 4. When cutting the film, the roller rolls on the outer surface of the packaging material 2. At this time, the friction between the roller and the packaging material 2 is rolling friction, which has a small friction force. This avoids damaging the packaging material 2 or rubbing the outer plastic film, which would disrupt the contact and cutting trajectory between the cutter 1 and the outer plastic film and affect the film cutting effect.

[0035] In this embodiment, the blade holder 4 is hinged to the connecting seat 7, and an elastic element 8 is provided between the two. The connecting seat 7 is connected to the film-cutting robot 6. When the cutter 1 cuts the film, the elastic element 8 generates elastic potential energy, which cooperates with the limiting element 5 to ensure that the tip of the cutter 1 will not cut through the packaging material 2 while keeping the cutter 1 close to the outer plastic film to adapt to the deformation of the packaging material 2. The film-cutting robot 6 drives the cutter 1 to move forward. The film-cutting robot 6 can be connected to a control module to set the travel path of the film-cutting robot 6, thereby realizing automated film cutting.

[0036] Preferably, in this embodiment, the elastic element 8 is a spring, which has a simple structure and low cost.

[0037] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. An automatic film cutting method for an all-plastic film unpacking machine, characterized in that: The cutter (1) performs repeated film cutting on the packaging material (2) with welded joints (3). The repeated film cutting action of the cutter (1) is as follows: the cutter path with the welded joints (3) on the packaging material (2) is set as AB, the cutter (1) is controlled to move forward from the side of the packaging material (2) in a clockwise or counterclockwise direction to cut the film, and the cutter (1) is controlled to repeatedly cut through AB to achieve repeated film cutting and complete the cutting of the outer plastic film.

2. The automatic film cutting method of the all-plastic film unpacking machine according to claim 1, characterized in that: If a welded joint (3) is encountered during the film cutting process, the cutter (1) will first cut through AB repeatedly, then resume forward film cutting until it returns to the starting point, and then cut the next packaging material (2).

3. The automatic film cutting method of the all-plastic film unpacking machine according to claim 2, characterized in that: When repeatedly cutting the welded joint (3), the cutter (1) starts from A and cuts to B, then retracts to A and cuts from A to B again and continues to move forward.

4. The automatic film cutting method of the all-plastic film unpacking machine according to claim 3, characterized in that: When retracting the blade, the cutter (1) retracts outward so that the blade of the cutter (1) does not come into contact with the outer plastic film during the retraction process.

5. The automatic film cutting method of the all-plastic film unpacking machine according to claim 1, characterized in that: Set the quantity of packaging material (2), control the cutter (1) to perform a single circumferential cut on the set quantity of packaging material (2), and perform a repeated film cutting action on the packaging material (2) after the set quantity. The single circumferential cut action is: control the cutter (1) to cut the packaging material (2) around once, and do not repeatedly cut through the cutter path AB during the circumferential cut.

6. The automatic film cutting method of the all-plastic film unpacking machine according to claim 5, characterized in that: The method for determining the set quantity of the packaging material (2) is as follows: take a sample of packaging material (2), and the cutter (1) performs a single ring cut on the sample of packaging material (2) in sequence. When the cutter (1) performs a single ring cut on the b-th sample of packaging material (2), it cannot completely cut the outer plastic film. Then the wear of the blade of the cutter (1) reaches the critical value. The number of packaging materials (2) that can be cut by a single ring cut is b-1, which is the set quantity.

7. The automatic film cutting method of the all-plastic film unpacking machine according to any one of claims 1 to 6, characterized in that: The cutter (1) is mounted on the cutter holder (4), and the cutter holder (4) is provided with a limiting member (5) for limiting the contact between the cutter (1) and the material inside the packaging material (2).

8. The automatic film cutting method of the all-plastic film unpacking machine according to claim 7, characterized in that: The limiting member (5) is a roller, which is rotatably mounted on the tool holder (4).

9. The automatic film cutting method of the all-plastic film unpacking machine according to claim 7, characterized in that: The blade holder (4) is hinged to the connecting seat (7), and an elastic element (8) is provided between the two. The connecting seat (7) is connected to the film cutting robot (6).

10. The automatic film cutting method of the all-plastic film unpacking machine according to claim 9, characterized in that: The elastic element (8) is a spring.

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