Injection mold capable of adjusting size of light guide plate

Abstract

The utility model relates to the technical field of production and processing of light guide plates, in particular to a size-adjustable injection mold for a light guide plate, which comprises an upper mold and a lower mold, the upper mold and the lower mold are matched for use, the bottom of the lower mold is fixedly connected with a base through a pair of mold feet, and a demolding mechanism is arranged between the base and the lower mold; wherein the demolding mechanism comprises an ejector plate and a mounting plate, a forming plate is arranged at the position, located in the forming cavity, of the lower mold, the forming plate is slidably connected with the forming cavity through a sealing structure, an adjusting assembly is further arranged between the forming plate and the mounting plate, and the adjusting assembly is used for adjusting the height of the forming plate. And the height of the forming plate is adjusted through an adjusting assembly to form the light guide plates with different thicknesses, a sealing structure is arranged between the forming plate and the forming cavity, and the height of the forming plate is adjusted in the mode that the mounting plate is fixedly connected with the base.

Description

Technical Field

[0001] This utility model relates to the field of light guide plate production and processing technology, and in particular to an injection mold with adjustable light guide plate size. Background Technology

[0002] A light guide plate is an optical element mainly used to guide and disperse the light emitted by LEDs or other point light sources evenly across the entire surface, thereby achieving uniform lighting or display effects. Light guide plates are widely used in backlight modules (BLU) of LCD displays, advertising light boxes, lighting equipment, electronic instrument displays, and other fields.

[0003] The production process of light guide plates requires injection molding using injection molds. For example, Chinese Patent Publication No. CN221697705U discloses an injection mold with a size adjustment structure, including: a lower mold plate, a female mold core, an ejection mechanism, and an upper mold plate. The female mold core is mounted on the side surface of the lower mold plate, and the ejection mechanism, which penetrates the interior of the female mold core, is connected to the side surface of the lower mold plate. This invention, through the coordinated use of a first sliding groove, a first sliding block, a connecting frame, and a limiting block, allows for several adjustments. First, when mold size adjustment is needed, the threaded rod is removed from the threaded groove and the limiting block. Then, the sub-mold core to be replaced is slid upwards through the sliding structure and removed from the connecting frame. The replacement sub-mold core is then placed into the connecting frame through the sliding structure. The threaded rod is then inserted through the mounting block and into the threaded groove inside the limiting block to fix the sub-mold core. By easily replacing the sub-mold core, its size can be changed, solving the problem of inflexible size adjustment of the mold core and subsequent production difficulties when the required plastic equipment sizes are inconsistent.

[0004] In practice, the mold core is replaced by unlocking the screw. However, the mold core is used in conjunction with multiple ejector pins for demolding. Replacing the mold core with a different specification will cause changes in the molding cavity. Therefore, it is also necessary to replace the ejector pins that are compatible with the molding cavity, which will increase downtime and reduce production efficiency. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the existing technology that requires replacing the mold core with a matching ejector pin when changing to a different specification, which leads to increased downtime and reduced production efficiency. The invention proposes an injection mold with an adjustable light guide plate size.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Design a light guide plate size adjustable injection mold, including an upper mold and a lower mold. The upper mold is used in conjunction with the lower mold. A base is fixedly connected to the bottom of the lower mold by a pair of mold feet. A demolding mechanism is provided between the base and the lower mold.

[0008] The demolding mechanism includes an ejector plate and a mounting plate. The lower mold is located in the molding cavity and has a molding plate. The molding plate is slidably connected to the molding cavity through a sealing structure. An adjustment component is also provided between the molding plate and the mounting plate. The adjustment component is used to adjust the height of the molding plate to form light guide plates of different thicknesses.

[0009] Furthermore, the sealing structure includes a sealing strip, the molding plate has a rectangular structure, and its periphery is recessed towards the center point to form a recessed groove, the sealing strip is sleeved in the recessed groove and slides against the inner wall of the molding cavity.

[0010] Furthermore, the adjustment assembly includes connecting rods, and a pair of connecting rods are fixedly connected to the bottom of the molding plate. The free ends of the connecting rods pass through the lower mold, the ejector plate, and the mounting plate, and a T-shaped block is provided at the free ends of the connecting rods via a guide slope.

[0011] Furthermore, the mounting plate has a sliding block inside via a groove. The top of the sliding block has an inclined surface that matches the guide inclined surface, and a T-shaped groove that slides through the inclined surface and connects to the T-shaped block. The groove is correspondingly provided with the connecting rod.

[0012] Furthermore, a screw is rotatably connected to one side of the abutment block, and the other end of the screw is threadedly connected to the mounting plate. A handwheel is also fixedly connected to the other end of the screw.

[0013] Furthermore, the demolding mechanism also includes a plurality of ejector pins, one end of which is fixedly connected to the ejector pin plate, and the other end of which passes through the lower mold and the forming plate in sequence. The mounting plate is fixedly connected to the base via a support rod, and the ejector pin plate is slidably connected to the support rod via an external driving component. The ejector pins are horizontally arranged with the forming plate.

[0014] The present invention provides an adjustable light guide plate injection mold, which has the following advantages: The present invention features a molding plate located within the molding cavity. The molding plate's height is adjustable via an adjustment component to form light guide plates of different thicknesses. Furthermore, a sealing structure is provided between the molding plate and the molding cavity to prevent injection molding liquid from entering the gap between the molding plate and the lower mold, ensuring good quality of the injection molded parts. In addition, the mounting plate and the ejector plate do not interfere with each other. The mounting plate adjusts the height of the molding plate by being fixedly connected to the base, while the ejector plate is driven by a cylinder to match the height of the molding plate, avoiding the formation of grooves between the ejector pins and the molding plate that could result in poor quality injection molded parts. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the molding plate of this utility model;

[0017] Figure 3 for Figure 2 A magnified structural diagram of area A;

[0018] Figure 4 This is a schematic diagram of the structure of the adjustment component of this utility model;

[0019] Figure 5 This is a cross-sectional view of the adjustment component of this utility model.

[0020] In the diagram: 1. Upper mold; 2. Lower mold; 21. Molding cavity; 3. Mold foot; 4. Base; 5. Demolding mechanism; 51. Ejector plate; 52. Mounting plate; 521. Slide groove; 53. Ejector pin; 54. Support rod; 6. Molding plate; 61. Recessed groove; 7. Sealing structure; 71. Sealing strip; 8. Adjusting component; 81. Connecting rod; 811. Guide slope; 82. T-block; 83. Abutment block; 84. T-slot; 85. Screw. Detailed Implementation

[0021] 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.

[0022] Reference Figure 1-5 An adjustable light guide plate injection mold includes an upper mold 1 and a lower mold 2. The upper mold 1 is used in conjunction with the lower mold 2. A base 4 is fixedly connected to the bottom of the lower mold 2 by a pair of mold feet 3. A demolding mechanism 5 is provided between the base 4 and the lower mold 2.

[0023] The demolding mechanism 5 includes an ejector plate 51 and a mounting plate 52. The lower mold 2 is located in the molding cavity 21 and is provided with a molding plate 6. The molding plate 6 is slidably connected to the molding cavity 21 through a sealing structure 7. An adjustment component 8 is also provided between the molding plate 6 and the mounting plate 52. The adjustment component 8 is used to adjust the height of the molding plate 6 to form light guide plates of different thicknesses.

[0024] It should be added that the upper mold 1 is connected to the injection molding machine through the connecting part at the top, and the lower mold 2 is fixedly connected to the mold core on the side near the upper mold 1, and the molding cavity 21 is provided inside the mold core.

[0025] Furthermore, the sealing structure 7 includes a sealing strip 71, the molding plate 6 has a rectangular structure, and its periphery is recessed towards the center point to form a recessed groove 61. The sealing strip 71 is sleeved in the recessed groove 61 and slides against the inner wall of the molding cavity 21.

[0026] Furthermore, the adjustment component 8 includes connecting rods 81. A pair of connecting rods 81 are fixedly connected to the bottom of the molding plate 6. The free ends of the connecting rods 81 pass through the lower mold 2, the ejector plate 51, and the mounting plate 52. A T-shaped block 82 is provided at the free ends of the connecting rods 81 via a guide slope 811.

[0027] More specifically, the mounting plate 52 has a sliding block 83 inside it via a sliding groove 521. The top of the sliding block 83 is provided with an inclined surface that cooperates with the guide inclined surface 811, and a T-shaped groove 84 that is slidably connected to the T-shaped block 82 via the inclined surface. The sliding groove 521 is correspondingly provided with the connecting rod 81.

[0028] In general, a screw 85 is rotatably connected to one side of the abutment block 83, and the other end of the screw 85 is threadedly connected to the mounting plate 52. A handwheel is also fixedly connected to the other end of the screw 85.

[0029] It is worth mentioning that the inclined surface generated by the guide inclined surface 811, together with the T-block 82 and the T-slot 84, can drive the connecting rod 81 to rise and fall while the drive block 83 moves. In particular, a pair of connecting rods 81 can be set to lock the forming plate 6 circumferentially.

[0030] The connecting rod 81 is slidably connected to the ejector plate 51 and the lower mold 2.

[0031] Finally, the demolding mechanism 5 also includes a number of ejector pins 53. One end of each ejector pin 53 is fixedly connected to the ejector plate 51, and the other end passes through the lower mold 2 and the forming plate 6 in sequence. The mounting plate 52 is fixedly connected to the base 4 through a support rod 54. The ejector plate 51 is slidably connected to the support rod 54 through an external driving component. The ejector pins 53 are horizontally arranged with the forming plate 6.

[0032] It should be added that the driving component is an external cylinder. The cylinder shaft end passes through the lower mold 2 and the mounting plate 52 and is fixedly connected to the ejector plate 51. The ejector plate 51 is driven to move by the cylinder shaft end, and the ejector is used to demold the injection molded part.

[0033] The other end of the ejector pin 53 needs to be evenly distributed within the molding plate 6 to ensure uniform force on the injection molded part. After the height of the molding plate 6 is adjusted, the cylinder drives the ejector plate 51 to move along with it through the shaft end to avoid the formation of grooves between the ejector pin 53 and the molding plate 6.

[0034] Working method: During operation, the upper mold 1 and the lower mold 2 are closed and injection molding is performed by the injection molding machine. After injection molding, the injection liquid is shaped and cooled by cold and hot pipes. After the injection molded part is cooled, the upper and lower molds are separated, and the shaft end of the cylinder moves through the ejector plate 51. The ejector pin 53 is used to push out the injection molded part for demolding.

[0035] When the height of the molding plate 6 needs to be adjusted, the screw 85 is rotated by handwheel. The screw 85 drives the stop block 83 to move. The stop block 83 uses the guide inclined surface 811, T-block 82, and T-slot 84 to drive the connecting rod 81 to rise and fall. At the same time, the connecting rod 81 rises and falls, driving the molding plate 6 to rise and fall, thus achieving the effect of adjusting the thickness of the light guide plate.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A light guide plate size-adjustable injection mold comprising an upper mold (1) and a lower mold (2), characterized in that: The upper mold (1) is used in cooperation with the lower mold (2), and the bottom of the lower mold (2) is fixedly connected with the base (4) through a pair of mold feet (3), and the base (4) is provided with a demolding mechanism (5) between the base (4) and the lower mold (2); Wherein, the demolding mechanism (5) includes a thimble plate (51) and a mounting plate (52), the lower mold (2) is provided with a forming plate (6) in the forming cavity (21), the forming plate (6) is slidably connected with the forming cavity (21) through a sealing structure (7), and an adjusting assembly (8) is further provided between the forming plate (6) and the mounting plate (52), the adjusting assembly (8) is used for adjusting the height of the forming plate (6) to form light guide plates with different thicknesses.

2. The light guide plate size-adjustable injection mold according to claim 1, wherein: The sealing structure (7) includes a sealing strip (71), the forming plate (6) is in a rectangular structure, and the periphery thereof is recessed to a center point to form a recessed groove (61), the sealing strip (71) is sleeved in the recessed groove (61) and slidably abuts the inner wall of the forming cavity (21).

3. The light guide plate size adjustable injection mold according to claim 1, wherein: The adjusting assembly (8) includes a connecting rod (81), a pair of connecting rods (81) are fixedly connected at the bottom of the forming plate (6), the free end of the connecting rod (81) penetrates the lower mold (2), the thimble plate (51) and the mounting plate (52), and a T-shaped block (82) is arranged at the free end of the connecting rod (81) through a guide inclined surface (811).

4. The light guide plate size-adjustable injection mold according to claim 3, wherein: The inside of the mounting plate (52) is slidably connected with a stop block (83) through a sliding groove (521), the top of the stop block (83) is provided with an inclined surface matched with the guide inclined surface (811), and a T-shaped groove (84) slidably connected with the T-shaped block (82) is arranged through the inclined surface, and the sliding groove (521) is correspondingly arranged with the connecting rod (81).

5. The injection mold for a light guide plate according to claim 4, wherein: A screw rod (85) is rotatably connected to one side of the stop block (83), the other end of the screw rod (85) is threadedly connected with the mounting plate (52), and a hand wheel is fixedly connected to the other end of the screw rod (85).

6. The light guide plate size adjustable injection mold according to claim 1, wherein: The demolding mechanism (5) further includes a plurality of thimbles (53), one end of the thimble (53) is fixedly connected with the thimble plate (51), the other end penetrates the lower mold (2) and the forming plate (6) in sequence, wherein the mounting plate (52) is fixedly connected with the base (4) through a supporting rod (54), the thimble plate (51) is slidably connected with the supporting rod (54) through an external driving member, and the thimble (53) is horizontally arranged with the forming plate (6).

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