Extrusion die head for producing GPPS diffusion plate

Abstract

According to the technical scheme, the extrusion die head for producing the GPPS diffusion plate comprises an upper die body, a lower die body and a lower die lip detachably connected to the front end of the lower die body, a feeding channel is arranged between the rear portion of the upper die body and the rear portion of the lower die body, and a flow stabilizing area channel is formed in the joint of the front end of the lower die body, the lower die lip and the upper die body. The front end of the top face of the lower die body is in downward smooth arc transition, the lower die lip is fixedly connected to the front end face of the lower die body through a screw, the top face of the lower die lip is flush with the top face of the front end face of the lower die body, and the position, corresponding to the front end of the lower die body, of the upper die body is in downward smooth arc transition. The top face of the middle of the lower die lip is of an upward inclined face structure from back to front, and a shaping extrusion channel with the fixed height is formed between the top face of the front portion of the lower die lip and the bottom face of the front end of the upper die body. According to the utility model, the phenomenon of dead angle material accumulation in the material channel can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the field of extrusion die heads, in particular to an extrusion die head for producing GPPS diffusion plates. Background Art

[0002] GPPS diffuser is a material with light diffusion properties in the sheet material category. It can effectively transform point or line light sources into soft and uniform surface light sources. It also has good light source dot matrix shielding properties and is relatively affordable. Therefore, it is widely used in the booming LCD-TV and LED lighting products. The existing extrusion die head structure for producing GPPS diffuser is as follows: Figure 1 As shown, it includes an upper die a, a lower die b, a feed channel c, a baffle rod device d, and an adjustable lower die lip e. Since the front end of the baffle rod device d can be adjusted and moved forward and backward, sharp-angled groove structures will appear at the front and rear end positions m and n where it contacts the feed channel c, and material accumulation will occur during normal extrusion. Similarly, since the adjustable lower die lip e needs to adjust the die lip opening gap up and down, a sharp-angled groove structure will appear at its rear end position o during the adjustment process, and material accumulation will occur during normal extrusion. The material accumulation areas formed at the above-mentioned m, n, and o will cause wire drawing during product extrusion, affecting the surface quality of the product. Utility Model Content

[0003] In view of the above problems, the utility model aims to provide an extrusion die head for producing GPPS diffusion plates, which has a novel structure and can effectively avoid the phenomenon of material accumulation in dead corners in the material channel.

[0004] The technical scheme of the utility model is an extrusion die head for producing GPPS diffusion plates, comprising an upper die body, a lower die body and a lower die lip detachably connected to the front end of the lower die body, a feed channel is arranged between the upper die body and the rear of the lower die body, a steady flow zone channel is formed at the intersection of the front end of the lower die body, the lower die lip and the upper die body, the front end of the top face of the lower die body transitions downward in a gentle arc shape, the lower die lip is fixedly connected to the front end face of the lower die body by screws and the top face of the lower die lip is flush with the top face of the front end head of the lower die body, the upper die body transitions downward in a gentle arc shape corresponding to the front end position of the lower die body, the middle top face of the lower die lip maintains an upward inclined surface structure from the back to the front, and a fixed height shaped extrusion channel is formed between the front top face of the lower die lip and the bottom face of the front end of the upper die body.

[0005] Preferably, a rectangular groove is provided on the front end surface of the lower mold body, and the lower mold lip is installed in the rectangular groove. The lower mold lip is locked and fixed along the front-to-back direction and the up-and-down direction by a series of screws.

[0006] Preferably, a fine-tuning groove is provided at the front end of the upper mold body, and an upper mold body in front of the fine-tuning groove forms an upper mold lip, and a step mounting portion is provided on the upper mold body behind the fine-tuning groove, and a series of mounting holes are provided at the step mounting portion, and a fine-tuning push-pull rod is passed through each mounting hole, and the front end of the fine-tuning push-pull rod passes through the fine-tuning groove and is connected to the upper mold lip by a fixing screw, and the rear end of the fine-tuning push-pull rod is connected with a fine-tuning screw, and the top surface of the step mounting portion is connected with a fine-tuning pressure block, and a fine-tuning square nut is positioned and installed in the fine-tuning pressure block, and the fine-tuning square nut is limited and prevented from rotating by the fine-tuning pressure block, and the fine-tuning screw passes through the fine-tuning pressure block from top to bottom and is connected to the threaded hole of the fine-tuning square nut; after the fine-tuning screw is rotated, the fine-tuning screw moves axially relative to the fine-tuning square nut and drives the fine-tuning push-pull rod to act on the upper mold lip to deform the fine-tuning groove, thereby changing the height of the forming extrusion channel.

[0007] Preferably, the flow channel area in the middle of the left and right side surfaces of the upper mold body and the lower mold body is provided with a small side plate sealing sheet, a small side plate and a top supporting small side plate in sequence from the inside to the outside, and the left and right outer side surfaces of the upper mold body and the lower mold body are respectively connected to large side plates, and the upper and lower large side plates are respectively positioned and squeezed on the upper and lower parts of the top supporting small side plates to ensure the sealing of the left and right sides of the mold body flow channel.

[0008] The utility model cancels the baffle rod device, changes the adjustable lower die lip structure into a fixed lower die lip structure, and sets the internal steady flow zone channel into a gentle arc-shaped transition structure to avoid the existence of dead corners, which can effectively avoid the phenomenon of dead corner material accumulation in the material channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the structure of an existing extrusion die head for producing GPPS diffusion plates;

[0010] Figure 2 It is a structural schematic diagram of the utility model;

[0011] Figure 3 for Figure 2 Schematic diagram of the cross-section structure in ;

[0012] Among them: 1—upper die body; 101—fine-tuning groove; 102—upper die lip; 103—step mounting portion; 2—lower die body; 3—lower die lip; 4—feed channel; 5—stable flow zone channel; 6—forming extrusion channel; 7—fine-tuning push-pull rod; 8—fixing screw; 9—fine-tuning screw; 10—fine-tuning pressure block; 11—fine-tuning square nut; 12—small side plate sealing sheet; 13—small side plate; 14—top holding small side plate; 15—large side plate. Implementation

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0014] like Figures 2 to 3As shown, the utility model provides an extrusion die head for producing GPPS diffusion plates, comprising an upper die body 1, a lower die body 2 and a lower die lip 3 detachably connected to the front end of the lower die body 2, a feed channel 4 is arranged between the upper die body 1 and the rear of the lower die body 2, a steady flow zone channel 5 is formed at the intersection of the front end of the lower die body 2, the lower die lip 3 and the upper die body 1, the front end of the top face of the lower die body 2 transitions downward in a gentle arc shape, the lower die lip 3 is fixedly connected to the front end face of the lower die body 2 by screws and the top surface of the lower die lip 3 is flush with the top surface of the front end head of the lower die body 2, the upper die body 1 transitions downward in a gentle arc shape corresponding to the front end position of the lower die body 2, the middle top surface of the lower die lip 3 maintains an upward inclined surface structure from the back to the front, and a fixed height shaping extrusion channel 6 is formed between the front top surface of the lower die lip 3 and the bottom surface of the front end of the upper die body 1.

[0015] In the above scheme, a rectangular groove is provided on the front end surface of the lower die body 2, the lower die lip 3 is installed in the rectangular groove, and the lower die lip 3 is locked and fixed by a series of screws in the front-to-back direction and the up-down direction, so that the connection structure of the lower die lip 3 is stable and reliable.

[0016] In addition, the front end of the upper mold body 1 is provided with a fine-tuning groove 101, the upper mold body 1 in front of the fine-tuning groove 101 forms an upper mold lip 102, and a step mounting portion 103 is provided on the upper mold body 1 behind the fine-tuning groove 101. A series of mounting holes are provided at the step mounting portion 103, and a fine-tuning push-pull rod 7 is passed through each mounting hole. The front end of the fine-tuning push-pull rod 7 passes through the fine-tuning groove 101 and is connected to the upper mold lip 102 through a fixing screw 8. The rear end of the fine-tuning push-pull rod 7 is connected with a fine-tuning screw 9. The top surface of the mounting portion 103 is connected with a fine-tuning pressure block 10, in which a fine-tuning square nut 11 is positioned and installed, and the fine-tuning square nut 11 is limited and prevented from rotating by the fine-tuning pressure block 10, and the fine-tuning screw 9 passes through the fine-tuning pressure block 10 from top to bottom and is connected with the threaded hole of the fine-tuning square nut 11; after the fine-tuning screw 9 is rotated, the fine-tuning screw 9 moves axially relative to the fine-tuning square nut 11 and drives the fine-tuning push-pull rod 7 to act on the upper die lip 102 to deform the fine-tuning groove 101, thereby changing the height of the shaping extrusion channel 6. The height of the shaping extrusion channel 6 can be reliably adjusted through this fine-tuning structure, and the adjustment structure is stable and reliable.

[0017] Furthermore, the flow channel area in the middle of the left and right side surfaces of the upper mold body 1 and the lower mold body 2 is provided with a small side plate sealing sheet 12, a small side plate 13 and a top supporting small side plate 14 in sequence from the inside to the outside, and the left and right outer side surfaces of the upper mold body 1 and the lower mold body 2 are respectively connected to large side plates 15, and the upper and lower large side plates 15 are respectively positioned and squeezed on the upper and lower parts of the top supporting small side plates 14 to ensure the sealing of the left and right sides of the mold body flow channel.

[0018] The utility model eliminates the throttling rod structure, adopts a smooth and seamless structure for the entire flow channel, adopts a unique fine-tuning push-pull structure for die lip adjustment, and changes the lower die lip into a fixed connection non-adjustable structure, which can prevent the problems of dead corners and material accumulation in the flow channel. The unique fine-tuning push-pull structure can better solve the problem of uneven product thickness, and obtain better products. By replacing the lower die lip, the production of products with different thicknesses can also be quickly achieved.

[0019] The above description is only a preferred implementation mode of the utility model, and does not impose any form of limitation on the utility model. Any simple modification, equivalent change or modification made to the above embodiments based on the technical principle of the utility model still falls within the scope of the technical solution of the utility model.

Claims

1. An extrusion die head for producing a GPPS diffuser plate, comprising an upper die body (1), a lower die body (2) and a lower die lip (3) detachably connected to the front end of the lower die body (2), a feed channel (4) being arranged between the rear parts of the upper die body (1) and the lower die body (2), characterized in that: A steady flow area channel (5) is formed at the intersection of the front end of the lower mold body (2), the lower mold lip (3) and the upper mold body (1); the front end of the top face of the lower mold body (2) transitions downward in a gentle arc shape; the lower mold lip (3) is fixedly connected to the front end face of the lower mold body (2) by screws and the top surface of the lower mold lip (3) is flush with the top surface of the front end head of the lower mold body (2); the upper mold body (1) transitions downward in a gentle arc shape corresponding to the front end position of the lower mold body (2); the middle top surface of the lower mold lip (3) maintains an upward inclined surface structure from the back to the front; and a fixed height shaped extrusion channel (6) is formed between the front top surface of the lower mold lip (3) and the bottom surface of the front end of the upper mold body (1).

2. The extrusion die head for producing GPPS diffusion plates according to claim 1, characterized in that: A rectangular groove is provided on the front end surface of the lower die body (2), and the lower die lip (3) is installed in the rectangular groove. The lower die lip (3) is locked and fixed in the front-to-back direction and the up-down direction by a series of screws.

3. The extrusion die head for producing GPPS diffusion plates according to claim 1, characterized in that: The front end of the upper mold body (1) is provided with a fine-tuning groove (101), the upper mold body (1) in front of the fine-tuning groove (101) forms an upper mold lip (102), and the upper mold body (1) behind the fine-tuning groove (101) is provided with a step mounting portion (103), and a series of mounting holes are provided at the step mounting portion (103), and a fine-tuning push-pull rod (7) is passed through each mounting hole, and the front end of the fine-tuning push-pull rod (7) passes through the fine-tuning groove (101) and is connected to the upper mold lip (102) by a fixing screw (8), and the rear end of the fine-tuning push-pull rod (7) is connected to a fine-tuning screw (9), and the step mounting portion (103) is provided with a series of mounting holes, and a fine-tuning push-pull rod (7) is provided in each mounting hole. The top surface of the part (103) is connected to a fine-tuning pressure block (10), a fine-tuning square nut (11) is positioned and installed in the fine-tuning pressure block (10), and the fine-tuning square nut (11) is limited and prevented from rotating by the fine-tuning pressure block (10). The fine-tuning screw (9) passes through the fine-tuning pressure block (10) from top to bottom and is connected to the threaded hole of the fine-tuning square nut (11); after the fine-tuning screw (9) is rotated, the fine-tuning screw (9) moves axially relative to the fine-tuning square nut (11) and drives the fine-tuning push-pull rod (7) to act on the upper die lip (102) to deform the fine-tuning groove (101), thereby changing the height of the shaping extrusion channel (6).

4. The extrusion die head for producing GPPS diffusion plates according to claim 1, characterized in that: The flow channel area between the left and right side surfaces of the upper mold body (1) and the lower mold body (2) is provided with a small side plate sealing sheet (12), a small side plate (13) and a top holding small side plate (14) in sequence from the inside to the outside. The left and right outer side surfaces of the upper mold body (1) and the lower mold body (2) are respectively connected to large side plates (15). The upper and lower large side plates (15) are respectively positioned and pressed on the upper and lower parts of the top holding small side plate (14) to ensure the left and right side surfaces of the mold flow channel are sealed.

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