A light guide plate rolling device

Abstract

This utility model discloses a light guide plate rolling device, which includes a first rolling frame with an upper roller and a lower roller respectively. At least one surface of each roller is provided with a first printing screen, and at least one end is connected to a drive motor. The axial direction of the upper and lower rollers is set at an angle of 30-60° with the traveling direction of the light guide plate. Preferably, a second rolling frame is added, and the rollers are adjusted by inserting a connecting column into a transverse groove, and the position is fixed by using a threaded adjusting handle. The device also includes a conveyor belt and a tunnel-type oven to stabilize the temperature, and the internal fluid channels of the rollers are connected to a heat transfer oil pump for further temperature control. The cross-angle rolling enhances the side forming force and reduces the warping deformation of the light guide plate in the traveling direction. This utility model is suitable for continuous production of light guide plates, especially improving the forming quality of light guide plates with multi-layer composite structures.

Description

Technical Field

[0001] This utility model relates to the technical field of light guide plate production equipment, specifically to a light guide plate rolling device. Background Technology

[0002] As shown in utility model patent CN222309816U, the light guide plate rolling device is a molding equipment specifically used for manufacturing light guide plates. It mainly consists of upper and lower rollers, a heating system, a pressure regulating mechanism, and a transmission device. Its core principle is to soften the light guide plate substrate (such as polycarbonate or polymethyl methacrylate) by heating it at high temperature, and then continuously roll the softened material through rollers to finally form a light guide plate with a specific thickness and optical structure.

[0003] The existing upper and lower rollers are mostly aligned with the output direction of the light guide plate. Since the light guide plate usually includes different materials such as dot structure and reflective paper along the thickness direction, conventional rolling devices can easily cause the light guide plate to warp after rolling. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a light guide plate rolling device to reduce or minimize the warping of the light guide plate during the rolling process.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A light guide plate rolling device includes a first rolling frame, with an upper roller and a lower roller respectively arranged on the upper and lower sides of the first rolling frame. A first printing screen is provided on the surface of one of the upper roller and the lower roller. At least one end of the upper roller and the lower roller is connected to the output end of a drive motor. The axial direction of the upper roller and the lower roller is set at an angle of 30-60° with the traveling direction of the light guide plate.

[0007] As a preferred technical solution, a second roller press frame is also provided, which is located downstream of the first roller press frame, and the second roller press frame is set at an angle of 30-60° with the traveling direction of the light guide plate.

[0008] As a preferred technical solution, the upper roller and the lower roller are offset in the horizontal direction.

[0009] As a preferred technical solution, a transverse groove is provided at the connection between at least one of the upper roller and the lower roller and at least one of the first roller press frame and the second roller press frame, and a connecting column is coaxially rotatably provided at the ends of the upper roller and the lower roller, and the connecting column is inserted into the transverse groove.

[0010] As a preferred technical solution, the end of the connecting column is provided with an external thread, the external thread is fitted with an adjusting handle, and the adjusting handle is provided with an internal thread adapted to the external thread.

[0011] As a preferred technical solution, a conveyor belt is provided between the upper roller and the lower roller.

[0012] As a preferred technical solution, a tunnel-type drying oven is provided above the conveyor belt.

[0013] As a preferred technical solution, a second printing screen is provided on one of the surfaces of the upper roller and the lower roller of the second roller press.

[0014] As a preferred technical solution, fluid channels are provided inside the upper roller and the lower roller, and the fluid channels are connected to the heat transfer oil pump through hoses.

[0015] The advantages and beneficial effects of this invention are as follows: the upper and lower rollers, which are set at an angle intersecting the direction of travel of the light guide plate, also have a rolling effect on the side of the light guide plate, thereby reducing the risk of warping of the light guide plate in the direction of travel. The internal fluid channels of the rollers can control the roller surface temperature, and in conjunction with the tunnel-type oven, the temperature during the processing of the light guide plate is relatively stable, thus better mitigating the warping problem. For the first roller pressing frame or the second roller pressing frame, the horizontal groove structure allows the upper and lower rollers to be adjusted in the horizontal direction to reduce their misalignment. Moving the roller on one side of the light guide plate away from the other roller along the direction of travel optimizes the force relationship and alleviates the warping phenomenon. It is suitable for continuous production of light guide plates, especially improving the forming quality of light guide plates with multi-layer composite structures. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the garment structure of this utility model.

[0018] Figure label:

[0019] 1-First roller press frame, 2-Upper roller, 3-Lower roller, 4-Drive motor, 5-Second roller press frame, 6-Transverse groove, 7-Connecting column, 8-Adjusting handle, 9-Conveyor belt, 10-Tunnel oven. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0021] Example 1

[0022] Please see Figures 1-2 This embodiment provides a light guide plate rolling device, including a first rolling frame 1, which forms a 45° angle with the traveling direction of the light guide plate. An upper roller 2 and a lower roller 3 are mounted on the first roller frame, and each roller is connected to a drive motor 4. The surface of the lower roller 3 is machined with a first printing screen. The upper and lower rollers are horizontally offset by 10mm. A conveyor belt 9 is arranged between the rollers, and a tunnel-type oven 10 is installed directly above the conveyor belt. The oven temperature is set to 180℃. The light guide plate (PC material) travels at a speed of 1.5m / min. The oven is preheated to 180℃, and the drive motor is started to match the roller speed with the conveyor belt. The light guide plate is fed into the rolling zone via the conveyor belt, where it is rolled at a 45° angle while simultaneously receiving radiant heating from the oven. The rolling pressure is set to 2MPa, continuously outputting light guide plates with a thickness of 0.8mm. Compared to traditional parallel rolling, this embodiment can reduce the warpage rate of the light guide plate from 12% to 3.5%. To counteract the lateral pushing force of the first roller pressing frame on the light guide plate, the conveyor belt is preferably equipped with a limiting side plate. The height of the limiting side plate is not higher than the thickness of the light guide plate, and the light guide plate is snapped into the limiting side plate.

[0023] Example 2

[0024] Based on Example 1, this example further includes a second roller press frame 5. The second roller press frame 5 rotates in the same direction and at the same speed as the first roller press frame, but is symmetrical to the first roller press frame on both sides of the conveyor belt, used to balance the lateral pushing force on the light guide plate between the two roller press frames. A connecting post 7 is installed in the transverse groove 6 of the second roller press frame 5, with the external thread at the end of the post engaging with the internal thread of the adjusting handle 8. The second roller press frame 5 forms a 60° angle with the light guide plate's travel direction, and a second printing screen is added to its lower roller. When the left side of the light guide plate is visually observed to be warped, the adjusting handle 8 is rotated counterclockwise two turns, causing the left roller to shift 1-10mm in the opposite direction along the transverse groove 6 and the light guide plate's travel direction. After visually improving the warping rate of the light guide plate, the adjusting handle 8 and the connecting post 7 are locked tightly together, and the gap between the adjusting handle 8 and the transverse groove 6 is secured.

[0025] Example 3

[0026] Based on Example 2, the first roller press 1 has an angle of 60° with the direction of travel of the light guide plate, and the internal fluid channels of the upper and lower rollers are circulated with 180°C heat transfer oil through a heat transfer oil pump; the second roller press 5 has an angle of 120° with the direction of travel of the light guide plate, and the roller temperature is assisted to be raised to 185°C by the oven 10; rotating the adjusting handle 8 causes the downstream roller to be vertically offset by 15mm to compensate for shrinkage. After being preheated to 150°C, the light guide plate enters the first roller press, and the initially formed plate enters the second roller press.

[0027] The working principle of this utility model is as follows: First, the tunnel oven 10 is started and the temperature is set (e.g., 180℃) to radiate preheat the light guide plate substrate, reducing the temperature difference between the material and the rollers. Simultaneously, the heat transfer oil pump is turned on to circulate heat transfer oil into the fluid channels inside the rollers, maintaining a uniform roller surface temperature. The drive motor 4 drives the conveyor belt 9 to transport the light guide plate, with the traveling speed synchronized with the subsequent roller pressing speed. The light guide plate enters the first roller pressing frame 1, where the roller axis forms a 30-60° angle with the light guide plate's traveling direction, generating oblique roller pressure. The upper and lower rollers are misaligned, and the horizontal misalignment distance is adjusted by the transverse groove 6 and the adjusting handle 8 to optimize the roller pressure distribution. The roller with the first printing screen is used to imprint the light guide plate with a microstructure. The light guide plate enters the downstream second roller frame 5. The roller axis is at an angle of 30-60° with the direction of travel and is set opposite to the first roller frame on the left and right sides of the conveyor belt. The roller surface of the second roller frame is provided with a second printing screen, which superimposes or modifies the previous screen structure and at the same time counteracts the lateral force of the first roller frame.

[0028] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A light guide plate rolling device, comprising a first rolling frame (1), characterized in that: The first roller press (1) is provided with an upper roller (2) and a lower roller (3) respectively. One of the surfaces of the upper roller (2) and the lower roller (3) is provided with a first printing screen. At least one end of the upper roller (2) and the lower roller (3) is connected to the output end of the drive motor (4). The axial direction of the upper roller (2) and the lower roller (3) is set at an angle of 30-60° with the direction of travel of the light guide plate.

2. The light guide plate rolling device according to claim 1, characterized in that: It also includes a second roller press (5) located downstream of the first roller press (1), the second roller press (5) being set at an angle of 120-150° to the direction of travel of the light guide plate.

3. The light guide plate rolling device according to claim 1, characterized in that: The upper roller (2) and the lower roller (3) are offset in the horizontal direction.

4. The light guide plate rolling device according to claim 1, characterized in that: At least one of the upper roller (2) and the lower roller (3) is disposed in the transverse groove (6) by a connecting column (7). The connecting column (7) is coaxially rotatably connected to the end of the roller. The transverse groove (6) is disposed at the roller connection point of at least one of the first roller press frame (1) and the second roller press frame (5).

5. The light guide plate rolling device according to claim 4, characterized in that: The end of the connecting column (7) is provided with an external thread and is threaded to an adjusting handle (8) with an internal thread.

6. The light guide plate rolling device according to claim 1, characterized in that: A conveyor belt (9) is provided between the upper roller (2) and the lower roller (3).

7. The light guide plate rolling device according to claim 6, characterized in that: A tunnel oven (10) is installed above the conveyor belt (9).

8. The light guide plate rolling device according to claim 2, characterized in that: The upper roller (2) and the lower roller (3) of the second roller press (5) are provided with a second printing screen.

9. The light guide plate rolling device according to claim 1, characterized in that: Both the upper roller (2) and the lower roller (3) are provided with fluid channels inside, and the fluid channels are connected to the heat transfer oil pump through hoses.

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