Film winding device

Abstract

The utility model discloses a thin film winding device which comprises a winding shaft and a rotating shaft. The pressing roller is located above the winding shaft and is parallel to the winding shaft, and the plane where the axis of the pressing roller and the axis of the winding shaft are located is perpendicular to the horizontal plane; the displacement compensation mechanism is connected with the pressing roller and used for enabling the pressing roller to move in the vertical direction; and the pressure reducing mechanism is connected with the pressing roller and is used for applying upward acting force to the pressing roller. According to the thin film winding device, constant pressure can be applied to the thin film on the winding shaft all the time through the pressing roller, air in the winding process is effectively exhausted, and the problem that bubbles exist on the surface of the thin film in the winding process is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of film production, further relates to film winding device. BACKGROUND

[0002] In the film winding process, due to the winding shaft diameter is small and the winding layer is more, the stress distribution of the film is uneven, and the local plastic deformation is easy to cause, thereby leading to product yield decline. At present, the pressure of the pressing roller on the winding shaft is adjusted and changed, but the pressure stability of the pressing roller on the winding shaft is difficult to guarantee, and the film surface deformation is more serious in the place where the film thickness is different when the pressing roller pressure is too large, and the interlayer air in the winding process cannot be effectively removed when the pressing roller pressure is too small, thereby leading to the bubble defect of the film surface, seriously affecting the surface quality and overall performance of the film. SUMMARY

[0003] In view of the above technical problems, the utility model aims at providing a film winding device to solve the problem of film surface bubble in the film winding process.

[0004] In order to achieve the above purpose, the film winding device provided by the utility model comprises:

[0005] Winding shaft;

[0006] Pressing roller, located above the winding shaft, arranged in parallel with the winding shaft, and the axis of the pressing roller is perpendicular to the horizontal plane of the plane where the axis of the winding shaft is located;

[0007] Displacement compensation mechanism, connected with the pressing roller, for enabling the pressing roller to displace along the vertical direction;

[0008] Pressure reduction mechanism, connected with the pressing roller, for applying an upward force to the pressing roller, and the force is less than the gravity of the pressing roller.

[0009] In some embodiments, the displacement compensation mechanism comprises a guide rail and a sliding block, the guide rail extends along the vertical direction, the sliding block is slidingly connected to the guide rail, and the roller shaft of the pressing roller is rotatably connected to the sliding block.

[0010] In some embodiments, the displacement compensation mechanism comprises a roller, the roller shaft of the pressing roller is rotatably connected to the inner shaft of the roller, the roller is rollingly connected to the strip-shaped groove opened in the rack, and the strip-shaped groove extends along the vertical direction.

[0011] In some embodiments, the pressure reduction mechanism comprises a deflection wheel, a wire rope and a counterweight, one end of the wire rope is connected to the counterweight, the other end of the wire rope is connected to the sliding block after passing through the deflection wheel.

[0012] In some embodiments, the pressing roller is of hollow structure.

[0013] In some embodiments, the compression roller is an encapsulated roller.

[0014] In some embodiments, the counterweight is slidingly connected in a sliding slot formed in the frame, and the sliding slot extends in a vertical direction.

[0015] In some embodiments, the peripheral wall of the compression roller is close to the winding position on the winding shaft at the position where the peripheral wall abuts against the film on the winding shaft.

[0016] In some embodiments, a guide roller is further included, and the film passes between the guide roller and the compression roller.

[0017] Compared with the prior art, the film winding device has the following beneficial effects:

[0018] The film winding device has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0019] The above features, technical characteristics, advantages and implementation manners of the present application will be further described in an explicit and understandable manner in combination with the preferred embodiments and the accompanying drawings.

[0020] Fig. 1 is a structure schematic diagram of the film winding device in another winding state in the preferred embodiment of the present application.

[0021] Fig. 2 is a structure schematic diagram of the film winding device in another winding state in the preferred embodiment of the present application.

[0022] Fig. 3 is a structure schematic diagram of the film winding device in another winding state in the preferred embodiment of the present application.

[0023] The accompanying drawings are as follows: frame 1; winding shaft 2; film 3; compression roller 4; counterweight 5; sliding slot 6; sliding block 7; wire rope 8; steering wheel 9; guide rail 10; guide roller 11. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the specific implementation manners of the present application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0025] AsFigs. 1 to 3 As shown, the film winding device according to the preferred embodiment of the present application comprises a winding shaft 2 and a pressing roller 4, the winding shaft 2 is used for winding the film 3, the pressing roller 4 is located above the winding shaft 2 and is arranged in parallel with the winding shaft 2, and the plane where the two shafts of the pressing roller 4 and the winding shaft 2 are located is perpendicular to the horizontal plane. During the continuous winding operation of the film 3 material, the driving motor drives the winding shaft 2 to rotate at a constant speed around its geometric center axis, at this time the outer surface of the pressing roller 4 forms a continuous contact interface with the film 3 material being wound on the surface of the winding shaft 2. The specific position of this contact interface is set in the tangent point area of the film winding path, the pressing roller 4 applies a constant normal pressure on the surface of the film 3 through an accurately designed mechanical transmission system, this pressure control method effectively suppresses the film 3 extension deformation and string bubble phenomenon commonly seen in traditional winding process, and improves the product quality. It should be noted that during the winding process, the pressure applied by the pressing roller 4 on the film 3 on the winding shaft 2 changes in a relatively small range, for actual production, it can be regarded as a constant pressure, rather than an absolute constant for any precision in the mathematical sense.

[0026] Considering the dynamic change characteristics of the film roll diameter during the continuous winding process, the device is configured with a displacement compensation mechanism, which can ensure that the pressing roller 4 always abuts against the film roll. The structure of the displacement compensation mechanism is not limited in this embodiment. As an example, the displacement compensation mechanism comprises a pair of guide rail and slider assemblies arranged on the rack 1, the two guide rail and slider assemblies are respectively located on the two axial sides of the pressing roller 4, the guide rail and slider assembly comprises a guide rail 10 and a slider 7, the guide rail 10 extends in the vertical direction, the slider 7 is slidingly connected to the guide rail 10, and the two axial ends of the pressing roller 4 are respectively rotatably connected to the two sliders 7. As another example, the displacement compensation mechanism comprises a pair of rollers (not shown), the two rollers are respectively rotatably connected to the two ends of the roller shaft of the pressing roller 4, and the rollers are rollingly connected in the strip-shaped groove of the rack 1, the strip-shaped groove extends in the vertical direction and is used to define the linear movement direction of the pressing roller 4, so that the pressing roller 4 can only displace along the extension direction of the strip-shaped groove, and the pressing roller 4 is connected with the rack 1 through the rollers, so that the pressing roller 4 moves along the strip-shaped groove without sliding, so as to reduce the friction coefficient between the pressing roller 4 and the rack 1 and the friction resistance required when moving the pressing roller 4. In this way, when the diameter of the film roll gradually increases with the winding process, the pressing roller 4 can produce adaptive displacement under the pushing force of the contact reaction force on the surface of the film 3, the pressing roller 4 will maintain contact with the film 3, and the actual pressure will always maintain at the preset value.

[0027] In the embodiment, the guide roller 11 is rotatably connected to the rack 1, the film passes between the guide roller 11 and the pressing roller 4, and is wound on the winding shaft 2. By the guide roller 11, the continuous contact interface formed by the pressing roller 4 and the film being wound can be limited to always be located in the tangent point area of the film winding path, which helps to stabilize the winding quality of the film 3.

[0028] In the embodiment, if the pressing roller 4 is too heavy, the load of the displacement compensation mechanism will be increased, which affects the service life of the equipment, and in the long run, it will also affect the accurate positioning of the pressing roller 4, and further affect the stability of the pressure control. Moreover, the pressing roller 4 that is too heavy can also crush the film 3, causing scratches or indentations on the surface of the film 3, affecting the product quality. In addition, during the winding process, the diameter of the film roll changes constantly, and the pressing roller 4 needs to quickly adjust the position. If the pressing roller 4 is too heavy, the inertia will increase, which can cause the adjustment speed to slow down, and the diameter change cannot be followed in time, causing pressure fluctuations and affecting the uniformity of the film roll. Therefore, the weight of the pressing roller 4 needs to be within a suitable range. The pressing roller 4 can adopt a hollow structure, and the material can be selected from materials with low density, such as nylon and polytetrafluoroethylene. The pressing roller 4 can also be made of composite materials, such as a low-density material for the inner layer and a mirror-finished stainless steel material for the outer layer. The pressing roller 4 is light in weight and can also reduce damage to the film 3.

[0029] In the embodiment, the device can also be configured with a pressure reduction mechanism. The pressure reduction mechanism can exert a vertical upward pulling force on the pressing roller 4 to offset part of the weight of the pressing roller 4, so that the pressure exerted by the pressing roller 4 on the film 3 is not too large. As an example, the pressure reduction mechanism includes a deflection wheel 9, a wire rope 8, and a counterweight 5. The deflection wheel 9 is connected to the rack 1, one end of the wire rope 8 is connected to the counterweight 5, and the other end is connected to the sliding block 7 after passing through the deflection wheel 9. In this way, the weight of the pressing roller 4 can be offset by the counterweight 5. The weight of the counterweight 5 can be adjusted according to the requirements to ensure that the pressure exerted by the pressing roller 4 is appropriate. Since the pressing roller 4 will exert a reverse force on the counterweight 5, the counterweight 5 will move relative to the rack 1. In order to make the movement of the counterweight 5 more stable and reduce the pressure fluctuation of the film 3 exerted by the pressing roller 4, a sliding groove 6 is formed in the rack 1, which extends in the vertical direction. The counterweight 5 is slidably connected in the sliding groove 6 to limit the movement direction of the counterweight 5.

[0030] In order to prevent the movement direction of the film 3 from deviating and affecting the subsequent winding effect, the pressing roller 4 needs to provide friction to the film 3 to achieve better compression effect. For example, the pressing roller 4 has a friction surface, such as a rubber-coated roller. The pressing roller 4 provides friction to the film 3 to compress the film 3.

[0031] The working principle of the film winding device in the embodiment is described as follows:

[0032] Before the film 3 is wound, the pressing roller 4 is moved to a proper position, exposing the gap between the pressing roller 4 and the winding shaft 2, after one end of the film 3 is fixed on the winding shaft 2, the force acting on the pressing roller 4 is cancelled, and the pressing roller 4 is pressed against the winding shaft 2 under the action of gravity. The driving motor drives the winding shaft 2 to rotate at a constant speed around the geometric center axis, and the outer surface of the pressing roller 4 forms a continuous contact interface with the film 3 material being wound on the winding shaft surface. When the diameter of the film roll gradually increases with the winding process, the pressing roller 4 is adaptively displaced under the pushing action of the contact reaction force on the film 3 surface, and the pressing roller 4 will maintain contact with the film 3, and the actual pressing force will always be maintained at a preset value.

[0033] In summary, the film winding device provided by the present application, the pressing roller 4 always applies a constant pressure to the film 3 on the winding shaft 2, effectively expelling the air in the winding process, and there is no problem of film surface bubble stringing in the winding process.

[0034] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A film winding apparatus characterized by comprising: The thin film winding device comprises: a winding shaft; a pressing roller, which is arranged above the winding shaft in parallel with the winding shaft, and the axis of the pressing roller is perpendicular to the horizontal plane in which the axis of the winding shaft is located; a displacement compensation mechanism, which is connected with the pressing roller and is used to displace the pressing roller in the vertical direction; a pressure reduction mechanism, which is connected with the pressing roller and is used to apply an upward force to the pressing roller, and the force is less than the gravity of the pressing roller.

2. The thin film winding device according to claim 1, wherein: the displacement compensation mechanism comprises a guide rail and a sliding block, the guide rail extends in the vertical direction, the sliding block is slidingly connected to the guide rail, and the pressing roller is rotationally connected to the sliding block.

3. The thin film winding device according to claim 1, wherein: the displacement compensation mechanism comprises a roller, the roller shaft of the pressing roller is rotationally connected to the inner shaft of the roller, and the roller is rollingly connected to a strip-shaped slot formed in the rack, and the strip-shaped slot extends in the vertical direction.

4. The thin film winding device according to claim 2, wherein: the pressure reduction mechanism comprises a deflection wheel, a wire rope and a counterweight, one end of the wire rope is connected to the counterweight, and the other end of the wire rope is connected to the sliding block after passing through the deflection wheel.

5. The thin film winding device according to claim 1, wherein: the pressing roller is of a hollow structure.

6. The thin film winding device according to claim 1, wherein: the pressing roller is an encapsulated roller.

7. The thin film winding device according to claim 4, wherein: the counterweight is slidingly connected to a sliding slot formed in the rack, and the sliding slot extends in the vertical direction.

8. The thin film winding device according to claim 1, wherein: the peripheral wall of the pressing roller is close to the winding position on the winding shaft at the position where the peripheral wall of the pressing roller abuts against the thin film on the winding shaft.

9. The thin film winding device according to claim 8, further comprising: a guide roller, and the thin film passes between the guide roller and the pressing roller.

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