Glass fiber transparent cover injection mold structure

Abstract

The utility model relates to an injection mold structure for a glass fiber transparent cover. The injection mold structure is characterized by comprising a front mold core and a rear mold core, an injection molding cavity is formed between the outer contour of the bottom end of the front mold core and the rear mold core; the straight-through type injection molding runner is directly arranged in the front mold core, the forced demolding condition formed by a bent runner does not exist, and under the conditions of a straight runner and a designed demolding angle, friction material scraps do not exist theoretically; the size of the injection molding opening is far smaller than that of the runner, according to the fluid theory, the runner is firstly filled with material flow, then side glue feeding is formed, then the product is filled, the material flow is perpendicular to the wall thickness of the product instead of being parallel to the wall thickness of the product, and therefore the completely-unblocked spraying effect is avoided, and spraying marks on the surface of the injection molding opening of the product are avoided; the injection molding port is higher than the bottom of the injection molding runner, and the lifting surface structures are designed at the bottom and the injection molding port, so that material scraps can be brought to the bottom by material flow even if the material scraps exist in the injection molding runner, the material scraps are prevented from entering a product to the greatest extent, and the product quality is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of glass fiber transparent covers, in particular to an injection mold structure of a glass fiber transparent cover. Background Art

[0002] The transparent head cover of glass fiber type gastroenteroscope and the head cover structure of medical lens require smooth outer surface and high transmittance, which are generally realized by injection molding; in the existing injection molding technology, the inner latent glue port is set in the injection mold to achieve the desired effect, such as Figure 1 As shown in the figure, the punch 01 of the injection mold adopts a two-stage structure, and the injection port provided on the punch 01 is located at the bottom end of the entire injection flow channel, and the injection flow channel adopts a curved latent glue port. The die 02 cooperates with the punch 01 to form the injection molding cavity. This structure has the following problems:

[0003] 1. The punch 01 of the injection mold adopts a two-stage structure and needs to be fixed with threads. This increases the processing complexity, reduces the strength of the mold core, and the space occupied by the threads makes it difficult to realize products with smaller inner diameter requirements, such as 3-5mm optical head covers; this increases the processing complexity;

[0004] 2. The injection port is located at the bottom of the injection runner. When the latent glue port is broken, it is easy to produce material chips due to friction with the inner wall of the mold. The material chips enter the product during the next injection, forming cold material lines and spots, which seriously affect the optical properties of the product. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a glass fiber transparent cover injection mold structure, which can solve the problem that in the existing glass fiber type gastrointestinal transparent head cover and the head cover structure of the medical lens, the latent glue port easily rubs against the inner wall of the mold when being pulled apart during injection molding, and the material chips enter the product during the next injection molding, forming cold material lines and spots, which seriously affect the optical properties of the product.

[0006] To solve the above technical problems, the technical solution of the present invention is: a glass fiber transparent cover injection mold structure, the innovation of which is that it includes a front mold core and a rear mold core; an injection molding cavity is formed between the bottom outer contour of the front mold core and the rear mold core;

[0007] A straight-through injection channel is provided in the front mold core along the vertical direction, and a side wall of the injection channel near the bottom end is connected to a side wall of the front mold core near the bottom end to form an injection port, and the injection port is in conduction with the injection molding cavity; the opening direction of the injection port is perpendicular to the extension direction of the injection channel; the position of the injection port is higher than the bottom end of the injection channel;

[0008] A lifting surface is provided between the bottom end of the injection flow channel and the injection port.

[0009] Furthermore, the diameter of the injection port is smaller than the diameter of the injection channel.

[0010] Furthermore, the lifting surface is a slope structure extending from the bottom end of the injection flow channel toward the injection port.

[0011] Furthermore, the lifting surface is a combined structure of an inclined section and a horizontal section extending from the bottom end of the injection runner toward the injection port.

[0012] Furthermore, the cross-sectional area of ​​the injection runner gradually decreases from the top end to the bottom end of the front mold core.

[0013] The advantages of the present invention are:

[0014] 1) In the present invention, a straight injection runner is directly set in the front mold core, and there is no forced demolding caused by a curved runner. In the case of a straight runner and a designed demolding angle, there is theoretically no friction material debris; furthermore, since the size of the injection port is much smaller than the runner, according to fluid theory, the material flow will first fill the runner and then form a side-injection glue and then fill the product, forming a material flow perpendicular to the product wall thickness rather than parallel to the product wall thickness, thereby avoiding the formation of a completely unobstructed injection effect and avoiding the appearance of spray marks on the surface of the product injection port.

[0015] 2) In the present invention, the injection port is higher than the bottom of the injection channel, and a lifting surface structure is designed at the bottom and the injection port. Even if there are material chips in the injection channel, they will be carried to the bottom by the material flow, thus preventing the material chips from entering the product to the greatest extent and greatly improving the product quality. The present invention simplifies the structure of the front mold core, and the front mold core is integrally formed without the need for threaded connection, thereby reducing the space occupied by the threaded structure and improving the strength of the front mold core, thereby enabling the production of smaller products. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0017] Figure 1 This is a structural diagram of the existing fiberglass transparent cover injection mold.

[0018] Figure 2 This is a structural schematic diagram of an injection mold for a glass fiber transparent cover of the utility model.

[0019] Figure 3 This is a partial enlarged view of the structure of the injection mold of a glass fiber transparent cover of the utility model.

[0020] Figure 4 This is another diagram of the lifting surface structure of Example 2 of the glass fiber transparent cover injection mold of the utility model. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0023] like Figures 1 to 3 The structure of the glass fiber transparent cover injection mold shown includes a front mold core 1 and a rear mold core 2; an injection molding cavity 3 is formed between the bottom outer contour of the front mold core 1 and the rear mold core.

[0024] A straight-through injection channel 4 is provided in the front mold core 1 along the vertical direction, and the side wall of the injection channel 4 near the bottom end is connected to the side wall of the front mold core near the bottom end to form an injection port 5, and the injection port 5 is connected to the injection molding cavity 3, and the diameter of the injection port 5 is smaller than the diameter of the injection channel 4; the opening direction of the injection port 5 is perpendicular to the extension direction of the injection channel 4; the position of the injection port 5 is higher than the bottom end of the injection channel 4; the cross-sectional area of ​​the injection runner 4 gradually decreases from the top end to the bottom end of the front mold core 1.

[0025] A lifting surface 6 is provided between the bottom end of the injection channel 4 and the injection port; the lifting surface is a slope structure extending from the bottom end of the injection channel 4 toward the injection port.

[0026] Example 2: The rest of the parts are the same as Example 1, except that: Figure 4 As shown, the lifting surface 6 is a combined structure of an inclined section and a horizontal section extending from the bottom end of the injection flow channel toward the injection port 5 .

[0027] The working principle of the present invention is as follows: a straight-through injection flow channel is directly set in the front mold core, and there is no forced demolding caused by a curved flow channel. In the case of a straight flow channel and a designed demolding angle, there is theoretically no friction of material chips; furthermore, since the size of the injection port is much smaller than the flow channel, according to fluid theory, the material flow will first fill the flow channel and then form side glue and then fill the product, forming a material flow perpendicular to the product wall thickness, rather than parallel to the product wall thickness, thereby avoiding the formation of a completely unobstructed injection effect and avoiding the appearance of spray marks on the surface of the product at the injection port; the injection port is higher than the bottom of the injection flow channel, and a lifting surface structure is designed at the bottom and the injection port. Even if there are material chips in the injection flow, they will be brought to the bottom by the material flow, thereby avoiding the material chips from entering the product to the greatest extent, greatly improving the product quality; the structure of the front mold core is simplified, and the front mold core is integrally formed without the need for threaded connection, reducing the space occupied by the threaded structure, while improving the strength of the front mold core, and realizing the production of smaller-sized products.

[0028] Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and the specification are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A glass fiber transparent cover injection mold structure, characterized by: It includes a front mold core and a rear mold core; an injection molding cavity is formed between the bottom outer contour of the front mold core and the rear mold core; A straight-through injection channel is provided in the front mold core along the vertical direction, and a side wall of the injection channel near the bottom end is connected to a side wall of the front mold core near the bottom end to form an injection port, and the injection port is in conduction with the injection molding cavity; the opening direction of the injection port is perpendicular to the extension direction of the injection channel; the position of the injection port is higher than the bottom end of the injection channel; A lifting surface is provided between the bottom end of the injection flow channel and the injection port.

2. The glass fiber transparent cover injection mold structure according to claim 1, characterized in that: The diameter of the injection port is smaller than the diameter of the injection flow channel.

3. The glass fiber transparent cover injection mold structure according to claim 1, characterized in that: The lifting surface is a slope structure extending from the bottom end of the injection flow channel toward the injection port.

4. The glass fiber transparent cover injection mold structure according to claim 1, characterized in that: The lifting surface is a combined structure of an inclined section and a horizontal section extending from the bottom end of the injection runner toward the injection port.

5. The glass fiber transparent cover injection mold structure according to claim 1, characterized in that: The cross-sectional area of ​​the injection runner gradually decreases from the top end to the bottom end of the front mold core.

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