High-precision injection molding device for LED light guide plate

Abstract

The utility model discloses a high-precision injection molding device for an LED (light-emitting diode) light guide plate, which is characterized in that an injection molding device and a mold closing device are arranged on a rack, and an electric control cabinet and an operation panel are fixedly arranged on the front side of the rack; the injection molding device comprises a heating cylinder, a hopper is connected above the heating cylinder, the front end of the heating cylinder is connected with a nozzle, and a pressurizing injection molding mechanism is arranged on the heating cylinder; the mold closing device comprises a fixed mold and a fixed plate which are fixedly arranged on the rack, a guide optical shaft is fixedly connected between the fixed mold and the fixed plate, a movable mold is slidably mounted on the guide optical shaft, the movable mold is connected with a driving mechanism, and the driving mechanism enables the movable mold to be closed with the fixed mold at a certain pressure; the rotating speed of the hydraulic motor is adjusted by controlling the pressure and flow of the hydraulic system, the injection pressure and speed are adjusted according to different products and materials, and the injection molding precision is guaranteed; the guide optical axis and the driving mechanism of the movable mold ensure that the mold closing system has enough rigidity, the mold closing pressure and the pressure maintaining pressure can be adjusted by controlling the hydraulic pressure, and the injection molding precision is further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of light guide plates, and in particular to a high-precision injection molding device for LED light guide plates. Background Art

[0002] LED light guides are typically made from optical-grade acrylic and utilize LCD display and backlight module technology. By utilizing the full transmittance of the light guide points, computer-controlled design of these points converts the light from the light guide into a uniformly distributed surface. The reflection points near the light sources at the ends of the light guide plate are small, circular, and widely spaced, while the reflection points in the center are densely packed and coarse, roughly elliptical in shape. When light enters the light guide plate from either side and hits the reflection points, it is diffusely reflected onto the surface. Another portion of light directly penetrates the plate and reaches the surface. The direct light is stronger in areas of the light guide plate closer to the light source, while weaker light is received farther away. Conversely, the reflection points closer to the light source are small and widely spaced, resulting in less diffuse light. Conversely, the larger, denser reflection points from distant sources reflect more abundant light. This complex fusion of light creates a uniformly bright effect across the entire light guide plate.

[0003] In the production of light guide plates, injection molding machines are often used. These machines, also known as injection molding machines or injection machines, are the primary molding equipment used to convert thermoplastics or thermosetting plastics into various shapes using plastic molding molds. They are available in vertical, horizontal, and all-electric models. These machines heat the plastic and apply high pressure to the molten plastic, causing it to eject and fill the mold cavity. The precision of light guide plate injection molding is influenced both by mold accuracy and by the performance of the injection molding machine. To ensure precision, the injection molding machine requires high injection pressure and speed, and the mold clamping system requires sufficient rigidity and high clamping accuracy to ensure precise control of pressure, flow, temperature, and metering. Utility Model Content

[0004] The purpose of the present utility model is to provide a high-precision injection molding device for an LED light guide plate, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a high-precision injection molding device for an LED light guide plate, comprising a frame, an injection molding device and a mold clamping device being sequentially mounted on the frame, an electric control cabinet and an operation panel being fixedly mounted on the front side of the frame, the electric control cabinet and the operation panel being electrically connected, a protective cover being mounted on the frame on the outside of the mold clamping device, the protective cover comprising a sliding door that can slide back and forth and is mounted with transparent organic glass or tempered glass, and a hydraulic pump being fixedly mounted on one end of the frame;

[0006] The injection molding device includes a heating cylinder, a hopper is connected to the top of the heating cylinder, a nozzle is connected to the front end of the heating cylinder, and a pressure injection molding mechanism is provided on the heating cylinder;

[0007] The mold clamping device includes a fixed mold and a fixed plate fixedly arranged on the frame, the nozzle is arranged at the front end of the fixed mold and injects the molten molding material into the cavity of the fixed mold, a guide light shaft is fixedly connected between the fixed mold and the fixed plate, a movable mold is slidably mounted on the guide light shaft, the fixed mold and the movable mold cooperate with each other, the movable mold is connected to a driving mechanism, and the driving mechanism enables the movable mold to be clamped with the fixed mold at a certain pressure.

[0008] Preferably, a plurality of heaters are installed on the outer wall of the heating cylinder, and the heaters are electric heaters.

[0009] Preferably, the pressurized injection molding mechanism includes a screw rotatably installed in the heating cylinder and a hydraulic motor fixedly installed at one end of the heating cylinder. The hydraulic motor drives the screw to rotate through a transmission mechanism so that the molten molding material in the heating cylinder is continuously ejected from the nozzle at high pressure. The hydraulic motor is connected to the hydraulic pump through a hydraulic pipeline.

[0010] Preferably, the driving mechanism includes a hydraulic cylinder fixedly mounted on the fixed plate, the output end of the hydraulic cylinder is connected to a crosshead, the upper and lower sides of the crosshead are hinged with connecting plates, the upper and lower sides of the rear end of the movable mold are respectively hinged with first connecting arms, the upper and lower sides of the front end of the fixed plate are respectively hinged with second connecting arms, the other ends of the first connecting arm and the second connecting arm are hinged to each other, the other end of the connecting plate is hinged to one end of the second connecting arm close to the first connecting arm, and the hydraulic cylinder is connected to the hydraulic pump through a hydraulic pipeline.

[0011] Preferably, guide parts are provided on the left and right sides of the fixed plate, and guide shafts are fixedly installed horizontally on the guide parts, and the left and right sides of the crosshead are slidably connected to the guide shafts.

[0012] Preferably, the hopper is arranged on a feeding platform, the feeding platform is fixedly mounted on the frame via a bracket, and guardrails are arranged around the feeding platform.

[0013] Beneficial effects: Compared with the existing technology, the beneficial effects of the utility model are: by controlling the pressure and flow of the hydraulic system to adjust the speed of the hydraulic motor, the injection pressure and speed can be adjusted according to different products and materials, thereby ensuring the accuracy of injection molding; the driving mechanism of the guide optical axis and the movable mold ensures that the clamping system has sufficient rigidity, and controlling the hydraulic pressure can adjust the clamping pressure and holding pressure, further ensuring the accuracy of injection molding; guardrails are set around the loading platform to ensure the safety of personnel during loading, prevent the occurrence of falling accidents, and improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of a high-precision injection molding device for LED light guide plates proposed in the utility model.

[0015] Figure 2 for Figure 1 Another perspective stereoscopic view after removing the protective cover.

[0016] Figure 3 It is a structural diagram of the mold clamping device.

[0017] Figure 4 Schematic diagram of the crosshead structure.

[0018] In the accompanying drawings: 1-frame, 2-injection molding device, 3-mold clamping device, 4-electric control cabinet, 5-operation panel, 6-protective cover, 7-hydraulic pump, 8-heating cylinder, 9-heater, 10-hopper, 11-nozzle, 12-hydraulic motor, 13-fixed mold, 14-fixed plate, 15-guide light axis, 16-movable mold, 17-hydraulic cylinder, 18-crosshead, 19-first connecting arm, 20-second connecting arm, 21-connecting plate, 22-guide part, 23-guide shaft, 24-loading platform, 25-guardrail. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0021] Example

[0022] Referring to the drawings in the specification, in an embodiment of the present invention, a high-precision injection molding device for an LED light guide plate comprises a frame 1, on which an injection molding device 2 and a mold clamping device 3 are sequentially provided. An electric control cabinet 4 and an operation panel 5 are fixedly provided on the front side of the frame 1, and the electric control cabinet 4 and the operation panel 5 are electrically connected. A protective cover 6 is provided on the outside of the mold clamping device 3 on the frame 1, and the protective cover 6 includes a sliding door that can slide back and forth and is installed with transparent organic glass or tempered glass. A hydraulic pump 7 is fixedly installed at one end of the frame 1;

[0023] The injection molding device 2 includes a heating cylinder 8, a hopper 10 is connected to the top of the heating cylinder 8, a nozzle 11 is connected to the front end of the heating cylinder 8, and a pressure injection molding mechanism is provided on the heating cylinder 8;

[0024] The mold clamping device 3 includes a fixed mold 13 and a fixed plate 14 fixedly mounted on the frame 1. The nozzle 11 is located at the front end of the fixed mold 13 and injects the molten molding material into the cavity of the fixed mold 13. A guide light shaft 15 is fixedly connected between the fixed mold 13 and the fixed plate 14. A movable mold 16 is slidably mounted on the guide light shaft 15. The fixed mold 13 and the movable mold 16 cooperate with each other. The movable mold 16 is connected to a driving mechanism that causes the movable mold 16 to clamp with the fixed mold 13 at a certain pressure. After the fixed mold 13 and the movable mold 16 are clamped, a cavity of a specified shape is formed inside, which is used to realize the injection molding of the LED light guide plate.

[0025] Specifically, in this embodiment, a plurality of heaters 9 are installed on the outer wall of the heating tube 8 , and the heaters 9 are electric heaters.

[0026] As a possible example, in this embodiment, the pressurized injection molding mechanism includes a screw rotatably installed in the heating cylinder 8 and a hydraulic motor 12 fixedly installed at one end of the heating cylinder 8. The hydraulic motor 12 drives the screw to rotate through a transmission mechanism to form a spiral feeding structure so that the molten molding material in the heating cylinder 8 is continuously ejected from the nozzle 11 at high pressure during the injection molding process and can maintain pressure at a certain pressure to ensure the quality of the injection molding. The hydraulic motor 12 is connected to the hydraulic pump 7 through a hydraulic pipeline.

[0027] As a possible example, in this embodiment, the drive mechanism includes a hydraulic cylinder 17 fixedly mounted on the fixed plate 14. The output end of the hydraulic cylinder 17 is connected to a crosshead 18, and the crosshead 18 has connecting plates 21 hinged on its upper and lower sides. The upper and lower sides of the rear end of the movable mold 16 are hinged to first connecting arms 19, respectively. The upper and lower sides of the front end of the fixed plate 14 are hinged to second connecting arms 20, respectively. The other ends of the first and second connecting arms 19, 20 are hinged to each other, and the other end of the connecting plate 21 is hinged to the end of the second connecting arm 20 near the first connecting arm 19. The hydraulic cylinder 17 is connected to the hydraulic pump 7 via a hydraulic pipeline. The fixed plate 14 is provided with guide portions 22 on both sides, and guide shafts 23 are fixedly mounted horizontally on each of the guide portions 22. The left and right sides of the crosshead 18 are slidably connected to the guide shafts 23. The hydraulic cylinder 17 drives the crosshead 18 forward, and through the transmission force of the connecting plates 21, the first and second connecting arms 19, 20, the movable mold 16 is clamped to the fixed mold 13 with a certain pressure.

[0028] As a possible example, in this embodiment, the hopper 10 is set on a loading platform 24, and the loading platform 24 is fixedly installed on the frame 1 through a bracket. Guardrails 25 are provided around the loading platform 24.

[0029] In order to ensure the quality of injection molding and facilitate the control of injection molding parameters, a temperature and pressure sensor is set at one end of the heating cylinder 8 connected to the nozzle 11, mainly to confirm whether the molding material is injected into the mold cavity at the desired pressure and temperature, and to use the electric control cabinet 4 and the operation panel 5 to control the heater 9 and the hydraulic motor 12 to adjust the temperature and pressure; a pressure sensor is installed on the movable mold 16 to detect the clamping pressure, and accordingly control the stroke of the hydraulic cylinder 17 or adjust the pressure of the hydraulic medium to achieve the adjustment of the clamping pressure.

[0030] In the utility model, the speed of the hydraulic motor is adjusted by controlling the pressure and flow of the hydraulic system, so that the injection pressure and speed can be adjusted according to different products and materials, thereby ensuring the accuracy of injection molding; the driving mechanism of the guide optical axis and the movable mold ensures that the clamping system has sufficient rigidity, and the clamping pressure and holding pressure can be adjusted by controlling the hydraulic pressure, thereby further ensuring the accuracy of injection molding; guardrails are set around the loading platform to ensure the safety of personnel during loading, prevent the occurrence of falling accidents, and improve safety; this application has a simple structure, strong practicality, and simple operation, which is worthy of promotion.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A high-precision injection molding device for LED light guide plates, characterized in that: The invention comprises a frame (1), wherein an injection molding device (2) and a mold clamping device (3) are sequentially arranged on the frame (1); an electric control cabinet (4) and an operation panel (5) are fixedly arranged on the front side of the frame (1); the electric control cabinet (4) and the operation panel (5) are electrically connected; and a hydraulic pump (7) is fixedly installed at one end of the frame (1); The injection molding device (2) comprises a heating cylinder (8), a hopper (10) is connected to the top of the heating cylinder (8), a nozzle (11) is connected to the front end of the heating cylinder (8), and a pressure injection molding mechanism is provided on the heating cylinder (8); The mold clamping device (3) comprises a fixed mold (13) and a fixed plate (14) fixedly arranged on the frame (1); the nozzle (11) is arranged at the front end of the fixed mold (13) and injects molten molding material into the cavity of the fixed mold (13); a guide light shaft (15) is fixedly connected between the fixed mold (13) and the fixed plate (14); a movable mold (16) is slidably mounted on the guide light shaft (15); the fixed mold (13) and the movable mold (16) cooperate with each other, and the movable mold (16) is connected to a driving mechanism, and the driving mechanism enables the movable mold (16) to clamp with the fixed mold (13) at a certain pressure.

2. The high-precision injection molding device for an LED light guide plate according to claim 1, characterized in that: A plurality of heaters (9) are installed on the outer wall of the heating cylinder (8), and the heaters (9) are electric heaters.

3. The high-precision injection molding device for an LED light guide plate according to claim 1, characterized in that: The pressurized injection molding mechanism includes a screw rotatably installed in the heating cylinder (8) and a hydraulic motor (12) fixedly installed at one end of the heating cylinder (8). The hydraulic motor (12) drives the screw to rotate through a transmission mechanism so that the molten molding material in the heating cylinder (8) is continuously ejected from the nozzle (11) at high pressure. The hydraulic motor (12) is connected to the hydraulic pump (7) through a hydraulic pipeline.

4. The high-precision injection molding device for an LED light guide plate according to claim 1, characterized in that: The driving mechanism comprises a hydraulic cylinder (17) fixedly mounted on the fixed plate (14); an output end of the hydraulic cylinder (17) is connected to a crosshead (18); the crosshead (18) is hinged with connecting pieces (21) on the upper and lower sides; the upper and lower sides of the rear end of the movable mold (16) are respectively hinged with first connecting arms (19); the upper and lower sides of the front end of the fixed plate (14) are respectively hinged with second connecting arms (20); the other ends of the first connecting arm (19) and the second connecting arm (20) are hinged with each other; the other end of the connecting piece (21) is hinged to one end of the second connecting arm (20) close to the first connecting arm (19); and the hydraulic cylinder (17) is connected to the hydraulic pump (7) through a hydraulic pipeline.

5. The high-precision injection molding device for an LED light guide plate according to claim 4, characterized in that: The fixed plate (14) is provided with guide parts (22) on both sides, and guide shafts (23) are fixedly installed horizontally on the guide parts (22). The cross head (18) is slidably connected to the guide shafts (23) on both sides.

6. The high-precision injection molding device for an LED light guide plate according to claim 1, characterized in that: The hopper (10) is arranged on a loading platform (24), and the loading platform (24) is fixedly mounted on the frame (1) via a bracket. Guardrails (25) are arranged around the loading platform (24).

7. The high-precision injection molding device for an LED light guide plate according to claim 1, characterized in that: A protective cover (6) is provided on the frame (1) outside the mold clamping device (3), and the protective cover (6) includes a sliding door that can slide forward and backward, and transparent organic glass or tempered glass is installed on the sliding door.

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