Film conveying structure

Abstract

The thin film conveying structure is used for driving a film roll to rotate so as to convey a thin film, the film roll is provided with a central shaft cavity, the thin film conveying structure comprises a driving component, a centering shaft and a stopping component, and the driving component is used for pulling the end of the thin film; the centering shaft extends into the central shaft cavity from one end, in the axial direction, of the film roll so that the film roll can rotate around the centering shaft; the stopping component comprises a brake part, and the brake part is connected with the other end, in the axial direction, of the film roll and used for providing torque for stopping rotation so as to stop rotation of the film roll. By means of the structure, high-speed conveying and timely stopping of the thin film can be achieved through the simple structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of preservative film packaging machine, concretely relates to the field of film conveying structure. BACKGROUND

[0002] In the film packaging machine, the film conveying mechanism is to convey the film in the film roll according to the required length.

[0003] The existing equipment needs to realize the high-speed non-continuous film conveying process. Generally, two power sources are needed: one pulls the film end, and the other rotates the film roll to reduce the resistance, so that the film roll can stop conveying in time, and the problems of reverse rotation or continuous conveying due to inertia will not occur.

[0004] For example, Chinese patent CN210555880 discloses a film clamping and releasing mechanism, which puts the paper tube wrapped with film on the connecting shaft, the rotating shaft is connected with the connecting shaft and the driving motor through the transmission wheel and the transmission belt respectively, and the transmission shaft is also provided with an electromagnetic brake. On the one hand, the driving motor is speeded up through the transmission shaft, improving the precision and stability of the equipment operation and ensuring the speed of film release. On the other hand, the electromagnetic brake is used to stop the rotation of the equipment, thereby reducing the problem of inaccurate film release caused by inertia motion of the equipment. A code wheel and a slot photoelectric sensor are also used as detection devices to accurately monitor the number of rotations of the driving motor, improve the precision of film release, and avoid wasting a large amount of film. However, the structure is relatively complex and large in size. UTILITY MODEL CONTENTS

[0005] An object of the utility model is to provide a film conveying structure that can achieve film conveying and timely stopping with a simple structure.

[0006] To achieve the above-mentioned purpose, the film conveying structure is used to drive the film roll to rotate to convey the film. The film roll has a central shaft cavity. The structure includes a driving component, a centering shaft, and a stopping component. The driving component is used to pull the end of the film. The centering shaft extends into the central shaft cavity from one end of the film roll in the axial direction to allow the film roll to rotate around it. The stopping component includes a brake piece connected to the other end of the film roll in the axial direction, which provides a torque to stop the rotation of the film roll.

[0007] In one or more embodiments, the stopping component further includes a chuck, and the brake piece is connected to the other end of the film roll in the axial direction through the chuck and extends into the central shaft cavity.

[0008] In one or more embodiments, the surface of the chuck is provided with a protruding part to increase the friction between the chuck and the inner wall of the central shaft cavity.

[0009] In one or more embodiments, the driving component is a film pulling clamp structure, which includes an upper film pulling part and a lower film pulling part, respectively contacting upper and lower surfaces of the film to clamp or release the film.

[0010] In one or more embodiments, the film pulling clamp structure pulls the film by moving along the film unwinding direction.

[0011] In one or more embodiments, the brake component includes a damping component.

[0012] In one or more embodiments, the brake component is a mechanical control structure or a hydraulic control structure or an electric control structure.

[0013] In one or more embodiments, the structure further includes a controller connected to the brake component.

[0014] In one or more embodiments, the brake component includes a connecting shaft, and the chuck includes a connecting hole connected to the connecting shaft.

[0015] The film conveying structure described above can directly output the torque for stopping the film roll from rotating by the stopping component, effectively simplifies the conveying structure, and can simply and efficiently convey and stop the film, thereby significantly reducing the cost of the machine. BRIEF DESCRIPTION OF DRAWINGS

[0016] 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.

[0017] Figure 1 is a schematic view of a film conveying structure.

[0018] SYMBOL EXPLANATION

[0019] 5 film roll

[0020] 5' film

[0021] 20 driving component

[0022] 30 brake component

[0023] 31 connecting shaft

[0024] 40 chuck

[0025] 41 protruding part

[0026] 42 connecting hole

[0027] 50 centering shaft

[0028] 51 centering shaft cavity

[0029] 60 controller

[0030] 70 Stopping components

[0031] 201 Upward-pulling membrane section

[0032] 202 Downward-pulling membrane section Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0034] It should be noted that these and other accompanying drawings are merely examples and are not drawn to scale, and should not be used as a limitation on the scope of protection of this utility model.

[0035] The film conveying structure is used to drive the film roll 5 to rotate in order to convey the film 5'. The film 5' is wound to form the film roll 5, which has a central shaft cavity 51. For high-speed, discontinuous film conveying schemes, the film roll needs to address the problem of over-rotation and inability to stop in time when stopping rapidly.

[0036] In response to this problem, Figure 1 A schematic diagram of a film conveying structure is shown, including a drive component 20, a centering shaft 50, and a stop component 70.

[0037] The drive component 20 is used to pull the end of the film 5'. The centering shaft 50 extends from one end of the film roll 5 along the axial direction S into the central shaft cavity 51, causing the film roll 5 to rotate around the centering shaft 50. The centering shaft 50 controls the concentricity of the film roll rotation. The stopping component 70 includes a brake 30. The brake is connected to the other end of the film roll 5 along the axial direction and is used to provide a torque to stop the rotation, thereby stopping the rotation of the film roll 5.

[0038] Furthermore, the stopping component 70 also includes a chuck 40, which is connected to the brake component 30. The chuck 40 extends from the other end of the membrane roll 5 along the axial direction S into the central shaft cavity 51. The brake component 30 provides a torque to stop rotation and transmits it to the membrane roll via the chuck 40 to stop the rotation of the membrane roll 5. In some embodiments, the brake component 30 includes a connecting shaft 31 that extends into the connecting hole 42 of the chuck 40, so that the two are coaxially rotatably connected. The brake component 30, chuck 40, centering shaft 50, and membrane roll 5 are concentrically arranged.

[0039] In a specific embodiment, the driving component 20 is a film pulling clamp structure, which includes an upper film pulling part 201 and a lower film pulling part 202, respectively contacting the upper and lower surfaces of the film 5' to clamp or release the film 5'. The film pulling clamp structure pulls the film along the film unwinding direction X, while the film roll 5 rotates along the axis S of the chuck 40 and the centering shaft 50 under the action of the chuck 40 and the centering shaft 50.

[0040] When the film pulling length reaches the set value, the film pulling clamp structure will decelerate and gradually stop. The film roll 5 will continue to rotate under the action of inertia, and the brake 30 needs to provide a torque to stop the rotation of the film roll and the forward movement of the film pulling clamp.

[0041] The brake 30 includes a damping part, which is preferably a controllable torque damping part, such as an electromagnetic brake, a hydraulic torque limiter, a clutch, etc. The brake 30 provides different deceleration effects for different working conditions by controlling the torque damping. The brake can adopt various control modes, such as mechanical control structure or hydraulic control structure or electric control structure. The electric control brake controls the operation of the brake system through an electric drive device, such as controlling the contact force between the brake pad and the brake by a motor. The mechanical control controls the brake system through a physical mechanism, relying on mechanical transmission to apply the brake force. The hydraulic control controls the brake through a hydraulic system, and the pressure of the hydraulic system controls the size of the brake force.

[0042] In order to further transmit the torque provided by the brake 30, the end surface of the chuck 40 extending into the center shaft cavity 51 is provided with a protrusion 41, the cross-sectional diameter of the protrusion 41 is equal to or slightly larger than the cross-sectional diameter of the center shaft cavity 51, which is used to increase the friction between the chuck and the inner wall of the center shaft cavity, and the other end of the chuck 40 is connected with the brake 30. Preferably, the surface of the protrusion 41 has a threaded structure, which further increases the friction between the chuck and the inner wall of the center shaft cavity.

[0043] When the film roll 5 moves under the drive of the driving component 20, the brake 30, the chuck 40 and the film roll 5, the centering shaft 50 rotate coaxially, at this time the brake 30 is in a passive rotation state; when the film roll 5 needs to stop rotating, the driving component 20 stops driving, the connecting shaft 3 of the brake 30 is locked, a fixed torque is output, which is transmitted to the film roll 5 through the friction between the chuck 40 and the inner wall of the center shaft cavity, to stop the rotation of the film roll 5.

[0044] In some embodiments, in order to ensure the timely stopping and stability of the film roll 5, the structure further includes a controller 60 connected with the brake 30 to control the brake 30 to provide braking at the appropriate time.

[0045] The film conveying structure can directly output the torque for stopping the film roll through the stopping part composed of the brake and the chuck, effectively simplifies the conveying structure, can simply and efficiently convey the film, and significantly reduces the cost.

[0046] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0047] At the same time, specific words are used in the present application to describe the embodiments of the present application. As "one embodiment", "an embodiment" and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "an alternative embodiment" mentioned in different positions in the specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be properly combined.

[0048] The utility model discloses although the above-mentioned thin film conveying structure is disclosed in the preferred embodiment, but it is not used to limit the utility model, any person skilled in the art can make possible change and modification without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent change and modification made to the above-mentioned embodiment according to the technical essence of the utility model, all fall within the protection scope defined by the claims of the utility model, without departing from the technical scheme of the utility model.

Claims

1. A film transport structure for driving a film roll to rotate to transport a film, the film roll having a central shaft cavity, characterized by, The structure comprises: a driving component for pulling the end of the film; a center shaft which extends into the center shaft cavity from one end of the film roll along the axial direction for the film roll to rotate thereon; a stopping component comprising a brake which is connected with the other end of the film roll along the axial direction for providing a stopping torque to stop the rotation of the film roll.

2. The film transport structure of claim 1, wherein, The stopping component further comprises a chuck through which the brake is connected with the other end of the film roll along the axial direction and extends into the center shaft cavity.

3. The film transport structure of claim 2, wherein, The chuck surface is provided with a protruding part for increasing the friction between the chuck and the inner wall of the center shaft cavity.

4. The film transport structure of claim 1, wherein, The driving component is a film pulling clamp structure which comprises an upper film pulling part and a lower film pulling part respectively contacting the upper and lower surfaces of the film for clamping or releasing the film.

5. The film transport structure of claim 4, wherein, The film pulling clamp structure pulls the film by moving along the film unwinding direction.

6. The film transport structure of claim 1, wherein, The brake comprises a damping part.

7. The film transport structure of claim 6, wherein, The brake is a mechanical control structure or a hydraulic control structure or an electric control structure.

8. The film transport structure of claim 1, wherein, The structure further comprises a controller which is signal connected with the brake.

9. The film transport structure of claim 2, wherein, The brake comprises a connecting shaft and the chuck comprises a connecting hole which is connected with the connecting shaft.

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