Film stretching mechanism and packaging machine
The film stretching mechanism, designed with a motor-driven linkage mechanism and non-planar clamping components, solves the problems of large size and uneven stretching of pneumatic mechanisms, achieving high-precision film stretching and consistent packaging results.
Patent Information
- Application Number
- CN202520060383.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-09
AI Technical Summary
Existing film packaging machines have large pneumatic mechanisms and uneven tensile force, which can lead to film tearing or poor sealing, affecting packaging effect and food preservation quality, and are also highly complex to operate.
The film stretching mechanism employs a moving component and a clamping component. It utilizes the frictional force of the motor-driven linkage mechanism and the clamping component to achieve precise film stretching. The clamping component is designed as a non-planar structure to compensate for displacement differences, which simplifies the equipment structure and improves the stretching accuracy.
It achieves high-precision and stable stretching of the film, reduces mechanical wear and failure rate, improves production efficiency and adaptability, and ensures consistent packaging results.
Smart Images
Figure CN223822143U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of film packaging machine, concretely relates to the field of film clamping structure. BACKGROUND
[0002] At present, most film packaging machines rely on pneumatic mechanism as the driving device for driving the rotation of the film roll, but the pneumatic mechanism has the problems of too large size and uneven and inaccurate stretching force. SUMMARY
[0003] An object of the utility model is to provide a film stretching mechanism with simplified structure and reliable stretching performance.
[0004] To achieve the above object, the film stretching mechanism is used for stretching the film along a first direction, comprising a moving assembly and a clamping assembly, the moving assembly comprises a moving piece, which is arranged to be movable along the first direction; the clamping assembly comprises a clamping piece and a first driving piece, the clamping piece is used for clamping the two sides of the film together with the moving piece, and the first driving piece is used for driving the clamping piece to reciprocate; wherein the moving assembly pulls the film and the clamping piece to move along the first direction by means of friction, and the clamping piece comprises a non-plane, which is used for keeping the contact between the clamping piece and the film when the clamping piece swings following the moving assembly.
[0005] In one or more embodiments, the clamping piece swings under the driving of the moving assembly, and the swinging direction comprises a partial direction of the first direction.
[0006] In one or more embodiments, the clamping piece comprises a conical clamping surface or an arc-shaped clamping surface.
[0007] In one or more embodiments, the first driving piece comprises a connecting rod mechanism and a driving motor, the clamping piece is rotatably connected with the connecting rod mechanism, and the driving motor is connected with the connecting rod mechanism and used for driving the connecting rod mechanism to move, thereby driving the clamping piece to reciprocate.
[0008] In one or more embodiments, the connecting rod mechanism is a hinge four-bar mechanism, the driving motor is connected with the connecting rod or connecting link of the hinge four-bar mechanism through a push rod, and the clamping piece is rotatably connected with the connecting rod or connecting link of the hinge four-bar mechanism.
[0009] In one or more embodiments, the first driving piece further comprises an elastic piece, two ends of the elastic piece are connected with the clamping piece and the connecting rod mechanism respectively, so as to reset the clamping piece by means of elastic force.
[0010] In one or more embodiments, the moving assembly comprises a second driving piece used for driving the moving piece to move along the first direction.
[0011] In one or more embodiments, the second driving member comprises a motor.
[0012] Another purpose of the present application is to provide a packaging machine comprising the above film stretching mechanism.
[0013] In one or more embodiments, the packaging machine further comprises a machine shell, the first driving member comprises a hinge four-bar mechanism and a driving motor, the machine shell serves as a rack of the hinge four-bar mechanism, and the driving motor is rotatably installed on the machine shell.
[0014] The film stretching mechanism fixes the film by using the moving assembly and the clamping assembly as the clamping mechanism, and makes the moving assembly move in the first direction to realize the stretching of the film, thereby eliminating the complexity of the traditional pneumatic system, enabling the film stretching mechanism to accurately and repeatedly complete the clamping and stretching of the film, and the non-planar structure on the clamping piece can compensate for the displacement difference generated when the clamping piece follows the moving assembly to swing. BRIEF DESCRIPTION OF DRAWINGS
[0015] The above and other features, properties, and advantages of the present application will become more apparent through the following description with reference to the accompanying drawings and embodiments, in which:
[0016] Figure 1 is a schematic view of the direction in which the film is stretched;
[0017] Figure 2 is a simplified structure diagram of the film stretching mechanism;
[0018] Figure 3 is a schematic view of the position of the clamping assembly after moving in the first direction;
[0019] Figure 4 is a schematic view of the position of the clamping piece and the moving piece before and after movement.
[0020] SYMBOL EXPLANATION
[0021] 5 film
[0022] 10 moving assembly
[0023] 20 clamping assembly
[0024] 21 clamping piece
[0025] 22 first driving member
[0026] 23 connecting rod mechanism
[0027] 24 driving motor
[0028] 25 elastic member
[0029] 26 fixing member
[0030] 51 first side
[0031] 52 second side
[0032] 210 clamping block
[0033] 211 connecting rod
[0034] 212 arc surface
[0035] 240 push rod DETAILED DESCRIPTION
[0036] The utility model will be further described below in combination with specific embodiments and drawings, and more details are set forth in the following description in order to fully understand the utility model, but the utility model can obviously be implemented in various other ways different from this description, and those skilled in the art can make similar generalization and deduction according to actual application conditions without departing from the connotation of the utility model, therefore the protection scope of the utility model should not be limited by the content of this specific embodiment.
[0037] It should be noted that these and other subsequent drawings are only examples, not drawn in proportion, and should not be used as a limitation on the actual protection scope required by the utility model.
[0038] At present, most fresh food packaging machines rely on air cylinders as the main driving device. Running the cylinder needs to be connected to a large air source, which not only limits the mobility and flexibility of the equipment, but also occupies valuable space. The working state of the pneumatic mechanism is unstable when the pressure fluctuates, and it cannot meet the strict pressure control, resulting in uneven stretching force of the film during the packaging process, which may cause film tearing or poor sealing, thereby affecting the packaging effect and the preservation quality of food. Moreover, it is difficult for the pneumatic mechanism to achieve precise force adjustment, especially when different packaging specifications need to be quickly switched, the operator often needs to frequently adjust manually, increasing the labor cost and operation complexity.
[0039] Based on this, the present disclosure proposes a film stretching mechanism, which improves the traditional transverse clamping mechanism in the film packaging machine. The traditional transverse clamping mechanism is generally used to eliminate the vertical lines generated after the film is stretched in the longitudinal direction, so that the film surface of the packaged object presents a bright and flat state, thereby improving the packaging quality, but the transverse clamping mechanism only plays a clamping role, and often has a complex structure and a large volume, which is not conducive to compact design and efficient production.
[0040] The film stretching mechanism used in the present disclosure plays a dual role of clamping and stretching, and has a more simplified structure and higher precision film stretching performance.
[0041] Referring toFigures 1 to 3 As shown, the film stretching mechanism is used to stretch the film 5 along a first direction X, which includes, but is not limited to, the transverse direction.
[0042] The film stretching mechanism includes a moving assembly 10 and a clamping assembly 20. The moving assembly 10 includes a moving member 11 and is configured to move along a first direction X. The clamping assembly 20 includes a clamping member 21 and a first driving member 22. The clamping member 21 is used to clamp both sides of the film together with the moving member 11. The first driving member 22 is used to drive the clamping member 21 to reciprocate to move closer to and away from the moving member 11, thereby clamping and releasing the film 5.
[0043] like Figure 1 As shown, the movable component 11 directly contacts the first side 51 of the clamping film 5, and the clamping component 21 contacts the second side 52 of the clamping film 5. The movable component 10 and the clamping component 21 pull the film 5 by friction, causing it to move along the first direction X. Specifically, the film 5 is clamped by the movable component 10 and the clamping component 21, and then moves along the first direction X under their pull. The clamping component 21 oscillates P under the drive of the movable component 10. The oscillation P includes a branch direction along the first direction X and a branch direction perpendicular to the first direction Y.
[0044] exist Figure 2 and Figure 3 In the embodiment shown, the first driving member 22 includes a linkage mechanism 23 and a drive motor 24. The clamping member 21 is rotatably connected to the linkage mechanism 23, and the drive motor 24 is connected to the linkage mechanism 23 to drive the linkage mechanism 23 to move, thereby driving the clamping member 22 to move back and forth.
[0045] Furthermore, the linkage mechanism 23 is a four-bar linkage, with four connecting members forming a parallelogram mechanism to ensure the packaging machine maintains a stable motion trajectory during operation. A four-bar linkage is a mechanism consisting of four revolute joints (A, B, C, D) connecting four components. The fixed component is the frame F, the two components connected to the frame are the connecting rods G, and the component not connected to the frame is the connecting rod H. The drive motor 24 is rotatably connected to either the connecting rod G or the connecting rod H of the four-bar linkage via a push rod 240, and the clamping member 21 is rotatably connected to either the connecting rod G or the connecting rod H of the four-bar linkage.
[0046] exist Figure 2 In the schematic diagram shown, the drive motor 24 is rotatably connected to the connecting rod G of the four-bar linkage via a push rod 240, and is also rotatably connected to a fixed component such as the housing 26 or the panel. The clamping member 21 is rotatably connected to the connecting rod H of the four-bar linkage. When the push rod extends, it applies force directly to the connecting rod G, causing the four-bar linkage to rise in a direction perpendicular to the first direction X or in other directions.Figure 3 The dashed lines show a schematic diagram of the overall rising position of connecting rod H' and connecting frame rod G'. Clamping member 21 also rises accordingly, as shown by the dashed lines, gradually approaching moving member 11 until it clamps the film 5 with moving member 11.
[0047] In some embodiments, the clamping member 21 further includes a connecting rod 211 and a clamping block 210 located at one end of the connecting rod 211, which are fixedly connected. The surface of the clamping block 210 contacts the second side 52 of the film 5, and the other end of the connecting rod 211 is rotatably connected to the connecting rod H or the connecting frame rod G to allow the clamping member 21 to swing, thereby generating a branch direction along the first direction X.
[0048] When the movable member 11 moves laterally along the first direction X, the film 5 and the clamping member 21 move together by means of the friction between the movable member 11 and the film 5 and the friction between the film 5 and the clamping member 21. Figure 3 The dashed line indicates the position of the moving member 11' after moving along the first direction X, and the dotted line indicates the position of the connecting rod 211' and the clamping block 210' after swinging. During the movement along the first direction, the moving member 11 and the clamping member 21 will continuously hold the film in a clamping state, thereby stretching the film 5 during lateral movement.
[0049] The second driving component 20 also includes an elastic element 25, with its two ends connected to the clamping component 21 and the linkage mechanism 23 respectively, to reset the clamping component 21 by means of elastic force. When the clamping component 21 moves to the stop point along the first direction X, the length of the stretched film 5 meets the requirements, and at this time the elastic element 25' is in a stretched state. When the push rod motor retracts, the parallelogram-shaped four-bar linkage moves downward, driving the clamping component 21 to descend, while the elastic element 25' retracts, causing the clamping component 21 to reset to its original position. At the same time, the moving component 11 also resets to its original position along the opposite direction of the first direction X. Figure 2 The state shown indicates preparation for the next film stretching operation.
[0050] like Figure 3 and Figure 4 As shown, during this movement, the end of the clamping block 210 of the clamping member 21 generates an arc-shaped running trajectory. If the end face of the clamping block is flat, the end face will descend during the swinging process, resulting in a height difference caused by the arc-shaped movement, which prevents the clamping member 21 from maintaining a tight grip on the film during the swinging process. To ensure that the clamping block 210 always clamps the film with the moving member 11, the clamping block 210 includes a non-planar component, for example... Figure 4As shown, the arc-shaped surface 212 reduces the distance between the lower left corner N of the clamping member and the moving member 11 from a to a1 after swinging. The raised arc surface compensates for the reduction in height difference. This arc ensures that the distance from point B of the rotating shaft to the moving member 11 remains at the same length b, thereby compensating for the height difference caused by the arc-shaped movement. Driven by the moving member 11, the clamping block 210 swings to the right. Compared to a flat surface, the raised surface of the arc-shaped surface 212 ensures that the moving member remains in contact with the film during the swing.
[0051] In addition to the curved surface, the clamping block 210 may also include a conical surface (not shown in the figure), and when the clamping block 210 swings with the moving member 11, the apex of the conical surface can also ensure contact with the film during the swinging process.
[0052] The above structure uses a motor as the component that drives the movement of the clamping parts. The precise control of the motor drives the lifting and lateral movement of the mechanism, replacing the traditional pneumatic device. This simplifies the equipment structure and ensures the consistency and reliability of the packaging effect.
[0053] Furthermore, the moving component includes a second driving member 12 for driving the moving member 11 to move along the first direction, and the second driving member 12 also includes a motor. Thus, the entire film stretching mechanism uses motors, enabling precise control of the film stretching accuracy and stability, thereby improving production efficiency and adaptability.
[0054] Based on the above description of the film stretching mechanism, a packaging machine can also be understood, including the film stretching mechanism in the machine housing. The first driving component includes a four-bar linkage and a drive motor. The machine housing serves as the frame of the four-bar linkage, and the drive motor is rotatably mounted on the machine housing.
[0055] The packaging machine also includes a film roll, on which the film is wound. The first direction is perpendicular to the axis of the film roll; pulling the film causes the film roll to roll, enabling multiple continuous film stretching processes.
[0056] The aforementioned film stretching mechanism and packaging machine have the following advantages: the clamping and stretching of the film is achieved through a linkage structure, which simplifies the equipment structure, ensures the stability of the equipment during high-speed operation, significantly reduces mechanical wear and failure rate, thereby reducing maintenance costs and downtime. Furthermore, through precise motor control technology, higher precision film stretching can be achieved, which can adapt to different sizes and types of fresh food packaging.
[0057] It should be noted that the use of terms such as "first" and "second" to define the components in the above content is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.
[0058] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.
[0059] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible variations and modifications without departing from the spirit and scope of the present invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims
1. A film stretching mechanism for stretching a film along a first direction, characterized in that, include: A movable component includes a movable element configured to move along the first direction; A clamping assembly includes a clamping member and a first driving member, wherein the clamping member is used to clamp both sides of the film together with the moving member, and the first driving member is used to drive the clamping member to reciprocate. The moving component and the clamping member use friction to pull the film to generate movement along a first direction. The clamping member includes a non-planar surface, which is used to keep the clamping member in contact with the film when it swings with the moving component.
2. The film stretching mechanism as described in claim 1, characterized in that, The clamping member swings under the drive of the moving component, and the swing direction includes a sub-direction of the first direction.
3. The film stretching mechanism as described in claim 1, characterized in that, The clamping element includes a tapered clamping surface or an arc-shaped clamping surface.
4. The film stretching mechanism as described in claim 1, characterized in that, The first driving component includes a linkage mechanism and a drive motor. The clamping component is rotatably connected to the linkage mechanism, and the drive motor is connected to the linkage mechanism to drive the linkage mechanism to move, thereby driving the clamping component to reciprocate.
5. The film stretching mechanism as described in claim 4, characterized in that, The linkage mechanism is a four-bar linkage, and the drive motor is rotatably connected to the connecting rod or link of the four-bar linkage via a push rod. The clamping member is rotatably connected to the connecting rod or link of the four-bar linkage.
6. The film stretching mechanism as described in claim 4, characterized in that, The first driving member further includes an elastic member, the two ends of which are respectively connected to the clamping member and the linkage mechanism, so as to reset the clamping member by means of elastic force.
7. The film stretching mechanism as described in claim 1, characterized in that, The moving component includes a second driving element for driving the moving element to move along the first direction.
8. The film stretching mechanism as described in claim 7, characterized in that, The second driving component includes a motor.
9. A packaging machine, characterized in that, Includes the film stretching mechanism as described in any one of claims 1-8.
10. The packaging machine as described in claim 9, characterized in that, The packaging machine also includes a housing, and the first driving component includes a four-bar linkage and a drive motor. The housing serves as the frame of the four-bar linkage, and the drive motor is rotatably mounted on the housing.