Gravity roller assembly

Abstract

The utility model discloses a gravity roller assembly which comprises a gravity roller and a gravity roller counterweight mechanism, and the gravity roller and the gravity roller counterweight mechanism are arranged on the same closed chain or are respectively arranged on two closed chains through a synchronous transmission mechanism. When the gravity roller and the gravity roller counterweight mechanism are respectively positioned on the ascending side and the descending side of the closed chain, the sum of the tension of the film and the counterweight tension of the gravity roller counterweight mechanism is balanced with the gravity of the gravity roller; when the gravity roller and the gravity roller counterweight mechanism are located on the same side of the closed chain, the sum of the counterweight tension and the gravity of the gravity roller is balanced with the tension of the thin film, the problems caused by the fact that the thin film in the stripping chamber is not completely cooled and solidified and the tension of a wet film fluctuates can be effectively solved, and the process quality of the current high-end thin film such as a polyimide thin film can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of film conveying, and particularly relates to a gravity roller assembly. Background Art

[0002] A gravity roller uses gravity to provide stable tension for film. Existing solutions, such as those described in Chinese Utility Model Patent No. CN213568692U, utilize vertical slide bars at both ends of the roller, leveraging the roller's own weight to achieve the desired tension. However, these solutions cannot adjust the applied tension and therefore cannot meet the requirements of current high-end film production processes. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a gravity roller assembly to solve the problem that the tension in the existing technical solution cannot be adjusted, so that the tension of the gravity roller can be controlled and easy to adjust. It is especially suitable for scenes with high requirements for tension control, such as cast film stripping rooms.

[0004] According to the technical solution of the utility model, the utility model provides a gravity roller assembly, including a gravity roller and a gravity roller counterweight mechanism, the gravity roller and the gravity roller counterweight mechanism are arranged on the same closed chain or are respectively arranged on two closed chains through a synchronous transmission mechanism; when the gravity roller and the gravity roller counterweight mechanism are respectively located on the upstream side and the downstream side of the closed chain, the sum of the film tension and the counterweight pull of the gravity roller counterweight mechanism is balanced with the gravity of the gravity roller; when the gravity roller and the gravity roller counterweight mechanism are located on the same side of the closed chain, the sum of the counterweight pull and the gravity roller gravity is balanced with the film tension.

[0005] Furthermore, it also includes a displacement detection mechanism connected to the gravity roller counterweight mechanism or the gravity roller or the synchronous transmission mechanism.

[0006] According to some embodiments, the gravity roller and the gravity roller counterweight mechanism are arranged on the same closed chain; the closed chain is in a vertically arranged ring, and the closed chain transmission is connected to the sprockets located at its upper and lower ends; the closed chain is connected to the floating block and the gravity roller counterweight mechanism, and the gravity roller is rotatably connected to the floating block.

[0007] According to some other embodiments, the closed chain includes a roller chain and a counterweight chain, and the gravity roller and the gravity roller counterweight mechanism are respectively arranged on the roller chain and the counterweight chain; the roller chain is in a vertically arranged ring shape, and the roller chain transmission is connected to the roller sprockets located at its upper and lower ends; the roller chain is connected to a floating block, and the gravity roller is rotationally connected to the floating block; the synchronous transmission mechanism includes a gravity roller synchronous shaft, and the upper and / or lower roller sprockets are coaxially connected to the counterweight sprocket through the gravity roller synchronous shaft, and the counterweight sprocket is transmission-connected to the counterweight chain; the counterweight chain is in a vertically arranged ring shape, and the counterweight chain is connected to the gravity roller counterweight mechanism.

[0008] Furthermore, there are two corresponding counterweight sprockets, the upper counterweight sprocket corresponds to the position of the upper roller sprocket and is coaxially connected through the gravity roller synchronization shaft, and the lower counterweight sprocket corresponds to the position of the lower roller sprocket.

[0009] Furthermore, the counterweight chain is located outside the roller chain.

[0010] Furthermore, it also includes a gravity roller slide rail vertically arranged on the frame, and the floating block is slidingly connected to the gravity roller slide rail in a matching manner.

[0011] Furthermore, both ends of the gravity roller in the length direction are connected to the two floating blocks respectively; in the length direction of the gravity roller, relative to the midpoint of the gravity roller length, the gravity roller assembly has a mirror-symmetrical structure.

[0012] Furthermore, the gravity roller counterweight mechanism has a detachable gravity roller counterweight.

[0013] Furthermore, the gravity roller is located in a multi-roller system, and the upstream side and the downstream side of the gravity roller are both adjacent to a guide roller, and the height position of the gravity roller is lower than the guide rollers on both sides.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0015] The gravity roller assembly of the present invention has a gravity roller counterweight mechanism with adjustable or pre-selectable counterweight gravity, which forms a downward combined force with the deadweight of the gravity roller and other components as the tension applied to the film. If the gravity roller assembly remains unchanged, the tension is constant; preferably, this solution separates the gravity roller counterweight mechanism from the gravity roller and controls them synchronously through a synchronous transmission mechanism. Such a setting allows the gravity roller counterweight mechanism to be located outside the film conveying area, forming sufficient operating space for staff to adjust the gravity roller counterweight mechanism; and, this solution is particularly suitable for the peeling chamber in the cast film production line. Other multi-roller systems such as winders and annealing furnaces generally do not require precise tension control. For wet films that still contain a lot of solvent after cast stripping, it is particularly necessary to pay attention to tension control to prevent excessive tension from stretching or damaging the film. Therefore, it is more helpful to improve the process quality of current high-end films such as polyimide films. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure according to an embodiment of the present utility model.

[0017] Figure 2 yes Figure 1 Front view of the structure shown.

[0018] Figure 3 yes Figure 1 Right side view of the structure shown.

[0019] Figure 4 It is a structural schematic diagram of a multi-roller system with a gravity roller assembly according to an embodiment of the present invention.

[0020] Figure 5a and Figure 5b It is a force analysis principle diagram of two implementation methods in the utility model.

[0021] Description of reference numerals in the accompanying drawings:

[0022] 3. Gravity roller; 31. Gravity roller slide; 32. Roller sprocket; 33. Roller chain; 34. Floating block; 35. Gravity roller synchronization shaft; 36. Counterweight sprocket; 37. Counterweight chain; 38. Gravity roller counterweight mechanism; 39. Wire encoder. DETAILED DESCRIPTION

[0023] The utility model provides a gravity roller assembly, which solves the problem that the tension in the existing technical solutions cannot be adjusted, and realizes that the tension of the gravity roller can be controlled and is easy to adjust. It is particularly suitable for scenes with high requirements for tension control, such as cast film stripping rooms.

[0024] See also Figures 1 to 4The present invention provides a gravity roller assembly comprising a gravity roller 3, which is located in a multi-roller system mounted on a frame. The gravity roller 3 is a driven roller, and is adjacent to a guide roller on both the upstream and downstream sides of the gravity roller 3. The gravity roller 3 is positioned lower than the guide rollers on either side. The gravity roller 3 is movable and connected to a gravity roller counterweight mechanism 38. The gravity roller 3 is used to adjust tension and perform micro-longitudinal stretching. The main principle is that the gravity roller counterweight mechanism 38 provides constant tension by gravity or other means, so that the gravity roller 3 pulls and stretches the film downward at this constant tension, and this constant tension is adjustable.

[0025] Specifically, the gravity roller assembly includes a gravity roller 3 and a gravity roller counterweight mechanism 38. The gravity roller 3 and the gravity roller counterweight mechanism 38 are arranged on the same closed chain, or separately on two closed chains via a synchronous transmission mechanism. (In other words, the gravity roller 3 and the gravity roller counterweight mechanism 38 are arranged on different closed chains, with a greater spatial separation, while still maintaining a synchronous transmission relationship.) A closed chain is an endless chain capable of transmitting rotation along this loop, forming a structure similar to a fixed pulley (or lever structure). Consequently, the gravity roller 3 and the gravity roller counterweight mechanism 38 can be located on the same side or on opposite sides of the fulcrum of the lever structure.

[0026] like Figure 5a As shown, when the gravity roller 3 and the gravity roller counterweight mechanism 38 are respectively located on the upstream side and the downstream side of the closed chain, the sum of the film tension F and the counterweight tension G1 of the gravity roller counterweight mechanism is balanced with the gravity G2 of the gravity roller, that is, the system resultant force = F + G1 - G2 = 0, so F = G2 - G1.

[0027] like Figure 5b As shown, when the gravity roller 3 and the gravity roller counterweight mechanism 38 are located on the same side of the closed chain, the sum of the counterweight tension G1 and the gravity roller gravity G2 is balanced with the film tension F, that is, the system force = F-G1-G2=0, so F=G1+G2.

[0028] In some embodiments, the gravity roller 3 and the gravity roller counterweight mechanism 38 are arranged on the same closed chain; the closed chain is in a vertically arranged ring, and the closed chain transmission is connected to the sprockets located at its upper and lower ends; the closed chain is connected to the floating block 34 and the gravity roller counterweight mechanism, and the gravity roller 3 is rotatably connected to the floating block 34.

[0029] In other preferred embodiments, the closed chain includes a roller chain 33 and a counterweight chain 37, with the gravity roller 3 and the gravity roller counterweight mechanism 38 disposed on the roller chain 33 and the counterweight chain 37, respectively. The roller chain 33 is vertically arranged in an annular shape and is drivingly connected to roller sprockets 32 located at its upper and lower ends. Floating blocks 34 are connected to the roller chain 33, to which the gravity roller 3 is rotatably connected. The synchronous transmission mechanism includes a gravity roller synchronous shaft 35. The upper and / or lower roller sprockets 32 are coaxially connected to counterweight sprockets 36 via the gravity roller synchronous shaft 35. The counterweight sprockets 36 are drivingly connected to the counterweight chain 37. The counterweight chain 37 is vertically arranged in an annular shape and is connected to the gravity roller counterweight mechanism 38.

[0030] Preferably, a gravity roller rail 31 is vertically mounted on the frame. A floating block 34 is slidably connected to the gravity roller rail 31, thereby limiting the gravity roller 3 to only vertical motion and ensuring smooth vertical motion. It is understood that the gravity roller rail 31 can be used to provide auxiliary positioning, regardless of whether the gravity roller 3 and the gravity roller counterweight mechanism 38 are arranged on the same closed chain or on different closed chains.

[0031] Specifically in Figures 1 to 3 In the illustrated embodiment, a gravity roller slide 31 is mounted on the frame of the multi-roller system. Upper and lower roller sprockets 32 are mounted near the upper and lower ends of the gravity roller slide 31, respectively, and are connected to a roller chain 33. The roller chain 33 is annular and has a floating block 34 on a straight segment on one side. The floating block 34 is rotatably connected to the gravity roller 3, for example, via a bearing seat. This allows the gravity roller 3 to rotate about its central axis and its central axis to move up and down along with the floating block 34.

[0032] Preferably, only the upper roller sprocket 32 ​​is coaxially connected to the counterweight sprocket 36 via the gravity roller synchronization shaft 35. Furthermore, the counterweight sprockets 36 are preferably arranged in pairs, one above the other, in a corresponding arrangement. The upper counterweight sprocket corresponds to the upper roller sprocket and is coaxially connected to the gravity roller synchronization shaft 35, while the lower counterweight sprocket corresponds to the lower roller sprocket. Positioning the gravity roller synchronization shaft 35 at the top allows it to better function as a fixed pulley and aligns the shape and position of the roller chain 33 and the counterweight chain 37, contributing to a more stable synchronous transmission. In other embodiments, gravity roller synchronization shafts 35 are provided at both the upper and lower sides.

[0033] In this embodiment, the gravity roller counterweight mechanism 38 and the floating block 34 are located on different sides of the ring of the counterweight chain 37 and the roller chain 33. Here, "different sides" refers to the two straight segments in the ring chain structure (i.e., the relative "upward side" and "downward side"), such as Figure 3As shown; because the longitudinal stretching tension required for the film is usually not large, the gravity of the gravity roller 3 can be "reduced" by the gravity roller counterweight mechanism 38 to achieve the required constant tension effect; of course, for example, for situations where a larger tension is required, it can be considered to set the gravity roller counterweight mechanism 38 on the same side of the floating block 34 and the gravity roller 3.

[0034] More specifically, because the length of the gravity roller 3 is greater than the film width and is typically longer, the two ends of the gravity roller 3 are connected to two floating blocks 34. Furthermore, the gravity roller assembly exhibits mirror-symmetry relative to the midpoint of the roller's length. This mirror-symmetry includes the consistency of the floating blocks 34 and the gravity roller counterweight mechanism 38 on both sides (including, for example, consistent mass and symmetrical position). In other words, the identical and symmetrical structures at both ends of the gravity roller 3 ensure uniform force distribution and alignment, thereby enabling uniform film stretching. Furthermore, preferably, the roller sprockets 32 and the counterweight sprocket 36 on both sides (the upper side) (a total of four sprockets) are coaxially connected via a gravity roller synchronization shaft 35, resulting in a more stable and simple structure.

[0035] Preferably, the counterweight chain 37 and counterweight sprocket 36 are located outside the roller chain 33 and roller sprocket 32. In a specific application, the gravity roller 3 is located within the film conveying area (such as a closed peeling chamber). This arrangement allows the gravity roller counterweight mechanism 38 to be located on the outside of the peeling chamber sidewall, creating an operating space for operators to easily adjust the gravity roller counterweight mechanism 38.

[0036] In some embodiments, the gravity roller counterweight mechanism 38 is a weight, such as a weight. The gravity applied by the gravity roller counterweight mechanism 38 can be varied by replacing weights of varying masses. In a preferred embodiment, the gravity roller counterweight mechanism 38 includes a removable gravity roller counterweight, such as a weight (adding weight), which can be installed or removed as needed to adjust the mass. Alternatively, other replaceable or adjustable counterweight methods can be employed. For example, the gravity roller counterweight mechanism 37 includes a horizontally arranged weight-adding support member (such as a circular tray), a vertical connecting rod fixedly connected to the middle of the weight-adding support member, and the lower portion of the weight-adding support member and the upper portion of the connecting rod are respectively connected to the counterweight chain 37 to form a ring. A weight-adding weight is detachably placed on the weight-adding support member, and one side of the weight-adding weight has an opening, and the connecting rod is located within the opening of the weight-adding weight. The weight-adding weight is, for example, a plurality of standard discs or pancakes, so that the total mass of the gravity roller counterweight mechanism 38 can be adjusted by adding or removing the weight. Furthermore, a positioning nut is threadedly mounted on the upper end of the connecting rod, which can be tightened to press the weight-adding weight below to prevent it from falling out.

[0037] The working principle of the gravity roller assembly of this solution is as follows. The roller sprocket 32 ​​and the counterweight sprocket 36 can only rotate synchronously. When the gravity roller counterweight mechanism 38 moves downward, the gravity roller 3 moves upward. The initial weight of the gravity roller is fixed. In the initial state, the roller is at the lower end. After the film is stretched, under the action of tension, the roller moves upward and the gravity roller counterweight mechanism 38 moves downward. Then, as Figure 5a And the above-mentioned force analysis can be adjusted to the required force balance state.

[0038] It is conceivable that the gravity roller counterweight mechanism is not limited to this. For example, in other embodiments, the gravity roller counterweight mechanism can also be selected as a hydraulic cylinder or a pneumatic cylinder, which is equivalent to replacing the gravity of the gravity roller counterweight mechanism 38 in the aforementioned embodiment with the force output by the hydraulic cylinder or the pneumatic cylinder.

[0039] Preferably, the gravity roller assembly further includes a displacement detection mechanism connected to the gravity roller counterweight mechanism 38 or the gravity roller 3 or the synchronous transmission mechanism, and the displacement detection mechanism is used to directly or indirectly detect the displacement of the gravity roller 3. Figure 5a In the ideal working state shown in the figure and with balanced forces, the position of the gravity roller 3 is basically stationary; however, in actual production applications, there may be sudden changes in tension, such as uneven film thickness, which causes changes in the film thickness below the gravity roller 3. The constant force acting on films of different thicknesses forms different stretching amounts, which is reflected in the up and down floating of the position of the gravity roller 3. The displacement detection mechanism monitors the distance of the up and down floating offset to understand the process conditions, and can further realize manual adjustment or automatic adjustment of the gravity roller counterweight mechanism 38 based on this.

[0040] For example, the displacement detection mechanism is a wire encoder 39 or a displacement sensor. For example, the main body of the wire encoder 39 is fixed to the frame, and the end of the wire of the wire encoder 39 is connected to the gravity roller counterweight mechanism 38, thereby measuring the distance the gravity roller counterweight mechanism 38 moves up and down. If the film is thick or the tension is too high, the downward force provided by the gravity roller counterweight mechanism 38 is increased to control the distance of its upward movement. Conversely, if the tension is too low, the downward force provided by the gravity roller counterweight mechanism 38 is reduced. Ideally, the roller is in the middle position, and the wire encoder 39 measures the distance, with the goal of adjusting the tension and conveying speed.

[0041] In summary, the gravity roller assembly of the present invention has a gravity roller counterweight mechanism with adjustable or pre-selectable counterweight gravity, which forms a combined force with the deadweight of the gravity roller and other components as the tension applied to the film. If the gravity roller assembly remains unchanged, the tension is constant; preferably, this scheme separates the gravity roller counterweight mechanism from the gravity roller and controls them synchronously through a synchronous transmission mechanism. Such a setting allows the gravity roller counterweight mechanism to be located outside the film conveying area, forming sufficient operating space for staff to adjust the gravity roller counterweight mechanism; and, this scheme is particularly suitable for the peeling chamber in the cast film production line. Other multi-roller systems such as winders and annealing furnaces generally do not require precise tension control. For wet films that still contain a lot of solvent after cast stripping, it is particularly necessary to pay attention to tension control to prevent excessive tension from stretching or damaging the film. Therefore, it is more helpful to improve the process quality of current high-end films such as polyimide films.

Claims

1. A gravity roller assembly, characterized in that: It includes a gravity roller and a gravity roller counterweight mechanism, which are arranged on the same closed chain or respectively on two closed chains through a synchronous transmission mechanism; When the gravity roller and the gravity roller counterweight mechanism are located on the upper and lower sides of the closed chain respectively, the film tension and the counterweight pulling force of the gravity roller counterweight mechanism are balanced with the gravity of the gravity roller; When the gravity roller and the gravity roller counterweight mechanism are located on the same side of the closed chain, the sum of the counterweight pulling force and the gravity roller weight is balanced with the film tension.

2. The gravity roller assembly according to claim 1, wherein: It also includes a displacement detection mechanism connected to the gravity roller counterweight mechanism or the gravity roller or the synchronous transmission mechanism.

3. The gravity roller assembly according to claim 1, wherein: The gravity roller and the gravity roller counterweight mechanism are arranged on the same closed chain; the closed chain is in a vertically arranged ring, and the closed chain transmission is connected to the sprockets located at its upper and lower ends; the floating block and the gravity roller counterweight mechanism are connected to the closed chain, and the gravity roller is rotatably connected to the floating block.

4. The gravity roller assembly according to claim 1, wherein: The closed chain includes a roller chain and a counterweight chain, and the gravity roller and the gravity roller counterweight mechanism are respectively arranged on the roller chain and the counterweight chain; the roller chain is in a vertically arranged ring shape, and the roller chain transmission is connected to the roller sprockets located at its upper and lower ends; the roller chain is connected to a floating block, and the gravity roller is rotationally connected to the floating block; the synchronous transmission mechanism includes a gravity roller synchronous shaft, and the upper and / or lower roller sprockets are coaxially connected to the counterweight sprocket through the gravity roller synchronous shaft, and the counterweight sprocket is transmission-connected to the counterweight chain; the counterweight chain is in a vertically arranged ring shape, and the counterweight chain is connected to the gravity roller counterweight mechanism.

5. The gravity roller assembly according to claim 4, characterized in that There are two corresponding counterweight sprockets, one above and one below. The upper counterweight sprocket corresponds to the position of the upper roller sprocket and is coaxially connected through the gravity roller synchronization shaft, and the lower counterweight sprocket corresponds to the position of the lower roller sprocket.

6. The gravity roller assembly according to claim 4, wherein: The counterweight chain is located outside the roller chain.

7. The gravity roller assembly according to any one of claims 3 to 6, characterized in that: The machine also comprises a gravity roller slide rail vertically arranged on the frame, and the floating block is matched with the gravity roller slide rail and is slidably connected.

8. The gravity roller assembly according to any one of claims 3 to 6, characterized in that: The two ends of the gravity roller in the length direction are respectively connected to the two floating blocks; in the length direction of the gravity roller, relative to the midpoint of the gravity roller length, the gravity roller assembly has a mirror-symmetrical structure.

9. The gravity roller assembly according to any one of claims 1 to 6, characterized in that: The gravity roller counterweight mechanism has a detachable gravity roller counterweight.

10. The gravity roller assembly according to any one of claims 1 to 6, characterized in that: The gravity roller is located in a multi-roller system, and the upstream side and the downstream side of the gravity roller are both adjacent to a guide roller. The height position of the gravity roller is lower than the guide rollers on both sides.

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