Extrusion device for processing diffusion plate

Abstract

The utility model discloses an extrusion device for diffusion plate processing, including base, set up on the extruder of base, two support plates of symmetrical arrangement in the front of extruder discharge gate and set up in the conveying structure and cooling structure between support plate, add a set of precooling structure to support plate, and precooling structure is composed of lower cooling roller and upper cooling roller, and the inside of lower cooling roller and upper cooling roller is hollow structure, is equipped with the import and export of cooling medium respectively, can pass into cooling water medium and exchanges heat, and one support plate's outside is equipped with motor, and the output of motor is connected with transmission roller, and transmission roller and lower cooling roller realize friction transmission through surface contact, the utility model discloses through electric telescopic link control upper cooling roller and its transmission system's overall lifting, can accurately adjust the clearance between upper cooling roller and lower cooling roller, this makes same equipment to be able to produce the diffusion plate of different thickness, and greatly improved the versatility and production flexibility of equipment.

Description

Technical Field

[0001] This utility model relates to the field of polymer material processing equipment technology, and in particular to an extrusion device for processing diffusion plates. Background Technology

[0002] Optical diffusers are a key component in backlight modules, transforming point or line light sources into uniform surface light sources. Diffusers are typically produced through an extrusion process, where plastic granules are heated and melted, extruded through a mold, cooled and shaped, and then rolled or cut.

[0003] In the prior art, such as the extruder for processing diffusion plates disclosed in Chinese Utility Model Patent Publication No. CN223339973U, the basic workflow includes: extruding molten plastic through the extruder body, pre-calendering it through a pressing structure, cooling the formed plate material through a cooling structure arranged above and below, and finally possibly processing it with a drying structure.

[0004] However, the existing technology has the following obvious drawbacks in practical applications: its pressing structure for initial forming typically consists of two extrusion rollers with a fixed gap. This fixed gap design makes the equipment inflexible and unable to adapt to the needs of producing diffusion plates of different thicknesses, limiting product diversity and production line flexibility; the sheet extruded from the extruder die is very hot and directly enters the extrusion rollers for calendering. Due to the lack of a pre-cooling step, the high-temperature, high-viscosity molten material easily adheres to the roller surface, leading to surface defects. It may also affect dimensional stability due to the pulling of viscous material, reducing product yield. Therefore, an extrusion device for diffusion plate processing is needed to meet these needs. Summary of the Invention

[0005] The purpose of this invention is to provide an extrusion device for processing diffusion plates, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an extrusion device for processing diffuser plates, comprising a base, an extruder mounted on the base, two support plates symmetrically arranged in front of the extruder's discharge port, and a conveying structure and a cooling structure disposed between the support plates. A pre-cooling structure is added to the support plates.

[0007] The precooling structure consists of a lower cooling roller and an upper cooling roller. Both the lower and upper cooling rollers are hollow, with inlets and outlets for cooling media, allowing for heat exchange with media such as cooling water. A motor is mounted on the exterior of one of the support plates, and the motor's output is connected to a drive roller. The drive roller and the lower cooling roller achieve frictional transmission through surface contact. A frame is fixed above the support plate, and an electric telescopic rod is mounted on the frame. A travel frame is connected to the bottom telescopic shaft of the electric telescopic rod, and a driven roller is rotatably mounted within the travel frame. This driven roller also achieves frictional transmission with the upper cooling roller through surface contact.

[0008] Preferably, to achieve synchronous power transmission and accommodate the lifting and lowering of the upper cooling roller, a first helical gear is fixedly connected to the same end of both the drive roller and the driven roller. A second helical gear meshes with one side of the first helical gear at the drive roller end, and a third helical gear meshes with one side of the first helical gear at the driven roller end. The second and third helical gears are arranged symmetrically. The second helical gear is fixedly connected to a rotating shaft, while the third helical gear is mounted on the rotating shaft via a sliding key structure, allowing it to slide axially along the shaft while rotating synchronously with it.

[0009] Preferably, in order to increase friction, ensure reliable transmission, and prevent slippage, rubber rings are fitted on the outer walls of both the drive roller and the driven roller.

[0010] Preferably, to stably support the rotating shaft, bearing seats are provided on the same side outside the support plate, the frame, and the travel frame. The rotating shaft is rotatably supported within these three bearing seats in sequence. Among them, the side of the second and third helical gears opposite to their meshing surfaces must be provided with bearing seats to withstand the axial force generated by the gear transmission.

[0011] Preferably, the sliding key connection between the rotating shaft and the third helical gear is specifically as follows: one or more grooves extending axially are provided on the outer wall of the rotating shaft, and a protrusion matching the shape of the groove is provided in the inner hole of the third helical gear. The protrusion is slidably embedded in the groove, thereby realizing the transmission of power and relative axial movement.

[0012] Preferably, in order to guide the up-and-down movement of the travel frame and ensure its stability, the outer wall of the frame is provided with vertically arranged slots, and the branches on both sides of the travel frame are slidably adapted to the slots.

[0013] The beneficial effects of this utility model are: In this invention, the overall lifting and lowering of the upper cooling roller and its transmission system is controlled by an electric telescopic rod, allowing for precise adjustment of the gap between the upper and lower cooling rollers. This enables the same equipment to produce diffuser plates of varying thicknesses, significantly improving the equipment's versatility and production flexibility.

[0014] In this invention, the pre-cooling structure allows the cooling medium circulating inside the cooling roller to quickly remove some of the heat from the sheet material, lowering its surface temperature, increasing its viscosity, and achieving initial shaping. This effectively prevents high-temperature materials from adhering to the roller, improves the surface quality of the product, and lays a good foundation for subsequent precise molding and cooling.

[0015] In this invention, the combination of helical gear set and rotating shaft ensures that the power can still be stably and synchronously transmitted to the upper and lower cooling rollers when the position of the upper cooling roller changes, thus ensuring the consistency and stability of the sheet material conveying speed and avoiding sheet material stretching or wrinkling caused by speed differences. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an extrusion device for processing a diffusion plate according to the present invention; Figure 2 This is a side view cross-sectional structural diagram of the precooling mechanism of an extrusion device for processing diffuser plates proposed in this utility model; Figure 3 This utility model proposes an extrusion device for processing diffusion plates. Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a front cross-sectional view of the lower cooling roller structure of an extrusion device for processing diffuser plates proposed in this utility model.

[0017] In the diagram: 1. Base; 2. Extruder; 3. Support plate; 4. Conveying structure; 5. Cooling structure; 6. Pre-cooling structure; 7. Lower cooling roller; 8. Upper cooling roller; 9. Motor; 10. Drive roller; 11. Frame; 12. Electric telescopic rod; 13. Stroke frame; 14. Driven roller; 15. First helical gear; 16. Second helical gear; 17. Third helical gear; 18. Shaft; 19. Rubber ring; 20. Bearing seat; 21. Groove; 22. Protrusion; 23. Slot. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Reference Figure 1-4 An extrusion apparatus for processing diffuser plates includes a base 1 on which an extruder 2 is mounted. Support plates 3 are fixed on both sides in front of the discharge port of the extruder 2. A pre-cooling structure 6, a conveying structure 4, and a cooling structure 5 are arranged sequentially from front to back between the support plates 3.

[0020] The pre-cooling structure 6 is the core improvement of this invention. It includes a fixed lower cooling roller 7 and an upper cooling roller 8 that can move up and down. Both are hollow inside, allowing circulating cooling water to pass through. A motor 9 is fixed to the outside of a support plate 3 on one side, and its output shaft is connected to a transmission roller 10. The transmission roller 10 makes frictional contact with the lower cooling roller 7 through a rubber ring 19 on its surface. The frame 11 is fixed to the support plate 3, and an electric telescopic rod 12 on it drives the travel frame 13 to rise and fall. The driven roller 14 inside the travel frame 13 makes frictional contact with the upper cooling roller 8 through its rubber ring 19. The vertical slots 23 on the side of the frame 11 guide the travel frame 13.

[0021] Motor 9 drives transmission roller 10 to rotate. Transmission roller 10 rotates the lower cooling roller 7 via friction, and its first helical gear 15 at its end drives the second helical gear 16 to rotate. The second helical gear 16 is fixed to a rotating shaft 18. The rotating shaft 18 is stably supported by three bearing seats 20. When the rotating shaft 18 rotates, its groove 21 engages with the protrusion 22 in the third helical gear 17, driving the third helical gear 17 to rotate synchronously. The third helical gear 17 then drives the first helical gear 15 at the end of the driven roller 14, causing the driven roller 14 to rotate, and ultimately driving the upper cooling roller 8 to rotate via friction. Because the third helical gear 17 can slide on the rotating shaft 18, power transmission is not interrupted when the electric telescopic rod 12 adjusts the height of the upper cooling roller 8.

[0022] During operation, the high-temperature molten diffusion plate extruded from the die head 2 of the extruder first enters the space between the upper cooling roller 8 and the lower cooling roller 7 of the pre-cooling structure 6. The roller gap is set according to the product thickness requirements via the electric telescopic rod 12. Driven by the motor 9, the upper cooling roller 8 and the lower cooling roller 7 rotate synchronously in opposite directions, pulling and pressing the plate, while the coolant inside them provides initial cooling and shaping. The pre-cooled plate then enters the subsequent conveying structure 4 and cooling structure 5 for final cooling and conveying.

[0023] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. An extrusion apparatus for processing diffuser plates, comprising a base (1), an extruder (2), a support plate (3), a conveying structure (4), and a cooling structure (5), characterized in that: The support plate (3) is provided with a precooling structure (6), which consists of a lower cooling roller (7) and an upper cooling roller (8). Both are hollow inside, with an inlet at one end and an outlet at the other. A motor (9) is provided outside the support plate (3), and a transmission roller (10) is connected to the output end of the motor (9). The transmission roller (10) is connected to the lower cooling roller (7) by frictional transmission. A frame (11) is provided on the support plate (3), and an electric telescopic rod (12) is provided on the frame (11). A travel frame (13) is provided on the telescopic shaft at the bottom end of the electric telescopic rod (12). A driven roller (14) is rotatably connected inside the travel frame (13), and the driven roller (14) is connected to the upper cooling roller (8) by frictional transmission.

2. The extrusion apparatus for processing a diffusion plate according to claim 1, characterized in that: The same end of the drive roller (10) and the driven roller (14) is connected to a first helical gear (15). A second helical gear (16) meshes with one side of the first helical gear (15) at the drive roller (10), and a third helical gear (17) meshes with one side of the first helical gear (15) at the driven roller (14). The third helical gear (17) and the second helical gear (16) are arranged symmetrically to each other. A rotating shaft (18) is connected to the second helical gear (16), and the third helical gear (17) is axially slidably connected to the rotating shaft (18).

3. The extrusion apparatus for processing a diffusion plate according to claim 1, characterized in that: Both the drive roller (10) and the driven roller (14) are provided with rubber rings (19) on their outer walls.

4. The extrusion apparatus for processing a diffusion plate according to claim 1, characterized in that: Bearing seats (20) are provided on the same side of the support plate (3), the frame (11) and the travel frame (13). The rotating shaft (18) is rotatably connected in the three bearing seats (20), two of which are respectively arranged on the side of the second helical gear (16) and the third helical gear (17) away from the meshing surface.

5. The extrusion apparatus for processing a diffusion plate according to claim 2, characterized in that: The outer wall of the rotating shaft (18) is provided with an axially arranged groove (21), and a protrusion (22) is provided in the third helical gear (17), which slides and adapts to the groove (21).

6. The extrusion apparatus for processing a diffusion plate according to claim 1, characterized in that: The outer wall of the frame (11) is provided with vertically arranged slots (23), and the two side branches of the travel frame (13) slide and adapt to the slots (23).

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