Sprue bush structure and injection mold

Abstract

The utility model provides a sprue bush structure and an injection mold. The sprue bush structure comprises the liquid inlet sprue bush. The liquid inlet sprue bush is embedded in the fixed mold mechanism and connected with the fixed mold mechanism, the liquid inlet sprue bush is provided with a main runner, the main runner comprises a first annular narrowing runner and a second connecting runner which are sequentially communicated, and the end, deviating from the first annular narrowing runner, of the second connecting runner is communicated with the forming cavity; at least two demolding convex surfaces are formed on the inner wall of the first annular narrowing runner, an annular cambered surface is formed at one end part of the liquid inlet sprue bush, the annular cambered surface is used for abutting against a nozzle of an injection molding machine, and a shearing opening communicated with the first annular narrowing runner is formed in the central point of the annular cambered surface. According to the utility model, through the demoulding convex surface, the adhesive force between a water gap sizing material of a molded plastic part and the inner wall of the first annular narrowing runner is effectively reduced; and the water gap sizing material at the shearing opening is subjected to shearing force, so that the water gap sizing material at the shearing opening can be quickly and reliably snapped and demoulded, and the production efficiency of a plastic part is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of small plastic parts production, in particular to a sprue sleeve structure and an injection mold. Background Art

[0002] Common portable devices include laptops, tablet computers, smart phones and smart watches. The internal assembly of the above portable devices usually requires the use of plastic structural parts; among them, the production and manufacturing of plastic structural parts usually requires the use of injection molds for production and manufacturing.

[0003] Since the plastic parts used in portable camera equipment usually need to be small and light, the corresponding injection mold design is also small injection molds; however, during the mold opening process of small injection molds, the rubber material in the main channel of the gate sleeve and the nozzle of the injection molding machine are difficult to break or not completely broken, resulting in wire drawing, which seriously affects the injection molding of the next plastic product, that is, the production efficiency of plastic products is low and the production cycle is long. To solve the above technical problems, the technical solution disclosed in Chinese patent document CN202640696U is provided. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a sprue sleeve structure and an injection mold which can make the sprue rubber material easy to break and demould.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A sprue bushing structure, comprising:

[0007] A liquid inlet gate sleeve, wherein the liquid inlet gate sleeve is embedded in and connected to a fixed mold mechanism, the liquid inlet gate sleeve is provided with a main flow channel, the main flow channel comprises a first annular narrowing flow channel and a second connecting flow channel which are connected in sequence, the end of the second connecting flow channel which is away from the first annular narrowing flow channel is connected to the molding cavity, at least two demolding convex surfaces are formed on the inner wall of the first annular narrowing flow channel, an annular arc surface is formed at one end of the liquid inlet gate sleeve, the annular arc surface is used to abut against the nozzle of an injection molding machine, and a shear opening which is connected to the first annular narrowing flow channel is provided at the center point of the annular arc surface.

[0008] In one of the embodiments, the liquid inlet gate sleeve is formed with a fixed hanging platform portion, the annular arc surface is located on the end surface of the fixed hanging platform portion, and the fixed hanging platform portion is screwed to the fixed mold mechanism.

[0009] In one embodiment, the demoulding angle of the first annular narrowing flow channel is 45° to 60°.

[0010] In one embodiment, the demoulding slope of the second connecting flow channel is 1° to 3°.

[0011] In one embodiment, the cutout is arranged in a rectangular shape.

[0012] In one embodiment, the polishing value Ra of the inner wall of the first annular narrowing flow channel and the inner wall of the second connecting flow channel is less than 1.6.

[0013] An injection mold comprises the gate sleeve structure described in any one of the above items, and the injection mold also comprises a fixed mold mechanism and a movable mold mechanism, the fixed mold mechanism and the movable mold mechanism are detachably connected, and the clamping end of the fixed mold mechanism and the clamping end of the movable mold mechanism jointly form a molding cavity.

[0014] In one embodiment, the molding cavity includes a flow channel molding cavity and multiple plastic part molding cavities, the liquid inlet end of the flow channel molding cavity is connected to the second connecting flow channel, and the multiple branch liquid outlet ends of the flow channel molding cavity are connected to each corresponding plastic part molding cavity.

[0015] In one embodiment, the number of the plastic part molding cavities is at least two.

[0016] In one embodiment, the movable mold mechanism includes an ejection pin and a sprue hook pin, the ejection pin is used to eject the molded plastic parts and runner plastic after mold opening, the ejection end of the sprue hook pin is provided with an annular groove, and the ejection end of the sprue hook pin is aligned with the central axis of the second connecting runner.

[0017] Compared with the prior art, the utility model has at least the following advantages:

[0018] The annular arc surface is abutted against the nozzle of the injection molding machine, so that the injection molding machine can inject the molten liquid rubber through the shearing opening to the first annular narrowing flow channel, the second connecting flow channel and the molding cavity in sequence to complete the injection and filling of the liquid rubber. After the liquid rubber is cooled and formed into a solid plastic part, the fixed mold mechanism remains fixed and the movable mold mechanism moves to open the mold; at least two demolding convex surfaces are formed on the inner wall of the first annular narrowing flow channel to effectively reduce the adhesion between the sprue rubber of the molded plastic part and the inner wall of the first annular narrowing flow channel; at the same time, it is ensured that the sprue rubber at the first annular narrowing flow channel and the shearing opening generates a large shear force during the mold opening process, so that the sprue rubber at the shearing opening can be quickly and reliably pulled off to complete the demolding of the sprue rubber, effectively improving the production efficiency of plastic parts and reducing the production cycle of a single plastic part. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic structural diagram of a sprue bushing structure in one embodiment;

[0021] Figure 2 for Figure 1 A schematic diagram of a half-section structure of a sprue bushing structure shown;

[0022] Figure 3 A schematic diagram of a partial exploded structure of an injection mold in another embodiment;

[0023] Figure 4 for Figure 3 A partial cross-sectional structural schematic diagram of the injection mold shown;

[0024] Figure 5 for Figure 3 A schematic structural diagram of a movable mold mechanism of the injection mold shown;

[0025] Figure 6 for Figure 5 A schematic diagram of the partial enlarged structure of the injection mold shown. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] The present invention provides a gate sleeve structure, including a liquid inlet gate sleeve, wherein the liquid inlet gate sleeve is embedded in a fixed mold mechanism and connected to the fixed mold mechanism, the liquid inlet gate sleeve is provided with a main flow channel, the main flow channel includes a first annular narrowing flow channel and a second connecting flow channel which are connected in sequence, the second connecting flow channel is connected to a molding cavity at one end away from the first annular narrowing flow channel, at least two demoulding convex surfaces are formed on the inner wall of the first annular narrowing flow channel, an annular arc surface is formed at one end of the liquid inlet gate sleeve, the annular arc surface is used to abut against the nozzle of an injection molding machine, and a shearing opening connected to the first annular narrowing flow channel is provided at the center point of the annular arc surface.

[0030] See also Figures 1 to 6 In order to better understand the sprue bushing structure 10 of the present application, the sprue bushing structure 10 is further explained below:

[0031] A gate sleeve structure 10 of one embodiment includes a liquid inlet gate sleeve 100, which is embedded in a fixed mold mechanism 200 and connected to the fixed mold mechanism 200. The liquid inlet gate sleeve 100 is provided with a main channel 101, and the main channel 101 includes a first annular narrowing channel 101a and a second connecting channel 101b which are connected in sequence. The end of the second connecting channel 101b which is away from the first annular narrowing channel 101a is connected to the molding cavity 201. At least two demolding convex surfaces 110 are formed on the inner wall of the first annular narrowing channel 101a. An annular arc surface 120 is formed at one end of the liquid inlet gate sleeve 100. The annular arc surface 120 is used to abut against the nozzle of an injection molding machine. A shear cut 102 connected to the first annular narrowing channel 101a is provided at the center point of the annular arc surface 120.

[0032] In this embodiment, the annular arc surface 120 abuts against the nozzle of the injection molding machine, so that the injection molding machine can inject the molten liquid rubber through the shear opening 102 into the first annular narrowing channel 101a, the second connecting channel 101b and the molding cavity 201 in sequence to complete the injection and filling of the liquid rubber. After the liquid rubber is cooled and molded into a solid plastic part, the fixed mold mechanism 200 remains fixed and the movable mold mechanism 300 moves to open the mold; at least two demolding convex surfaces 110 are formed on the inner wall of the first annular narrowing flow channel 101a to effectively reduce the adhesion between the sprue rubber of the molded plastic part and the inner wall of the first annular narrowing flow channel 101a; at the same time, it is ensured that the sprue rubber at the first annular narrowing flow channel 101a and the shear opening 102 generate a large shear force during the mold opening process, so that the sprue rubber at the shear opening 102 can be quickly and reliably pulled off to complete the demolding of the sprue rubber, which effectively improves the production efficiency of plastic parts and reduces the production cycle of a single plastic part.

[0033] like Figures 1 to 3 As shown, in one embodiment, the liquid inlet gate sleeve 100 is formed with a fixed hanging platform portion 130 , the annular arc surface 120 is located at the end surface of the fixed hanging platform portion 130 , and the fixed hanging platform portion 130 is screwed to the fixed mold mechanism 200 .

[0034] It is understood that the main channel 101 of the liquid inlet gate sleeve 100 can ensure that the temperature loss of the molten liquid rubber is reduced before being injected into the molding cavity 201, so as to avoid the liquid rubber from being cooled and molded prematurely due to excessive temperature loss, thereby affecting the molding quality of the plastic product. In this embodiment, the shape of the fixed hanging platform 130 is rectangular, and screws are used to facilitate the disassembly and assembly of the liquid inlet gate sleeve 100; it is understood that in other embodiments, the liquid inlet gate sleeve 100 with a circular shape of the fixed hanging platform 130 can be used to adapt to the nozzles of different types of injection machines.

[0035] like Figure 1 to Figure 2As shown, in one embodiment, the demoulding slope of the first annular narrowing flow channel 101a is 45° to 60°. In one embodiment, the demoulding slope of the second connecting flow channel 101b is 1° to 3°. It can be understood that by setting the demoulding slope, the problem of structural interference between the sprue rubber formed in the first annular narrowing flow channel 101a and the second connecting flow channel 101b can be avoided during the demoulding process, thereby improving the smoothness of the demoulding of the sprue rubber. Specifically, in this embodiment, the first annular narrowing flow channel 101a adopts a demoulding slope of 50°, so that the wall thickness of the shearing opening 102 connected to the first annular narrowing flow channel 101a is very thin, so that during the demoulding process of the sprue rubber, a large shear stress can be generated at the shearing opening 102, so that the sprue rubber at the shearing opening 102 can be quickly and reliably pulled off to complete the demoulding of the sprue rubber, effectively improving the production efficiency of plastic parts and reducing the production cycle of a single plastic part.

[0036] like Figure 1 to Figure 2 As shown, in one embodiment, the shearing opening 102 is arranged in a rectangular shape. It is understandable that the shearing opening 102 can have a better shearing effect, making it easier to cut or pull off the rubber material at the water inlet at the shearing opening 102, and preventing the first annular narrowing flow channel 101a or the shearing opening 102 from being blocked.

[0037] like Figure 1 to Figure 2 As shown, in one embodiment, the polishing value Ra of the inner wall of the first annular narrowing flow channel 101a and the inner wall of the second connecting flow channel 101b is less than 1.6. It can be understood that the lower polishing value can effectively reduce the roughness of the inner wall of the first annular narrowing flow channel 101a and the inner wall of the second connecting flow channel 101b, so that the inner wall of the first annular narrowing flow channel 101a and the inner wall of the second connecting flow channel 101b have a higher smoothness, thereby reducing the adhesion of the nozzle rubber to the inner wall, ensuring that the nozzle rubber is easier to demold.

[0038] See also Figures 2 to 6 The present application also provides an injection mold 20, including the gate sleeve structure 10 described in any of the above embodiments, and the injection mold 20 also includes a fixed mold mechanism 200 and a movable mold mechanism 300, the fixed mold mechanism 200 and the movable mold mechanism 300 are detachably connected, and the clamping end of the fixed mold mechanism 200 and the clamping end of the movable mold mechanism 300 jointly form a molding cavity 201.

[0039] In this embodiment, the annular arc surface 120 abuts against the nozzle of the injection molding machine, so that the injection molding machine can inject the molten liquid rubber through the shear opening 102 into the first annular narrowing channel 101a, the second connecting channel 101b and the molding cavity 201 in sequence to complete the injection and filling of the liquid rubber. After the liquid rubber is cooled and molded into a solid plastic part, the fixed mold mechanism 200 remains fixed and the movable mold mechanism 300 moves to open the mold; at least two demolding convex surfaces 110 are formed on the inner wall of the first annular narrowing flow channel 101a to effectively reduce the adhesion between the sprue rubber of the molded plastic part and the inner wall of the first annular narrowing flow channel 101a; at the same time, it is ensured that the sprue rubber at the first annular narrowing flow channel 101a and the shear opening 102 generate a large shear force during the mold opening process, so that the sprue rubber at the shear opening 102 can be quickly and reliably pulled off to complete the demolding of the sprue rubber, which effectively improves the production efficiency of plastic parts and reduces the production cycle of a single plastic part.

[0040] like Figure 2 , Figure 4 and Figure 6 As shown, in one embodiment, the molding cavity 201 includes a flow channel molding cavity 201a and a plurality of plastic part molding cavities 201b, the liquid inlet end of the flow channel molding cavity 201a is connected to the second connecting flow channel 101b, and the plurality of branch liquid outlet ends of the flow channel molding cavity 201a are connected to each corresponding plastic part molding cavity 201b. In one embodiment, the number of the plastic part molding cavities 201b is at least two. It can be understood that the molten liquid rubber flows through the second connecting flow channel 101b and enters the liquid inlet end of the flow channel molding cavity 201a, and then is filled into each corresponding plastic part molding cavity 201b by the plurality of branch liquid outlet ends of the flow channel molding cavity 201a, so as to realize the production of plastic parts with "one mold and multiple cavities". It can be understood that in this embodiment, the injection mold 20 is a "one mold and eight cavities" structural design, which effectively improves the production efficiency of plastic parts and reduces the production cycle of plastic parts while ensuring the smooth demolding of the sprue rubber.

[0041] like Figures 3 to 6As shown, in one embodiment, the movable mold mechanism 300 includes an ejector pin 310 and a sprue hook pin 320. The ejector pin 310 is used to eject the molded plastic part and the runner plastic after the mold is opened. The ejector end of the sprue hook pin 320 is provided with an annular groove 3201. The ejector end of the sprue hook pin 320 is aligned with the central axis of the second connecting runner 101b. It can be understood that after the injection mold 20 is filled and cooled, the runner plastic part is filled in the annular groove 3201 and is simultaneously covered on the ejector end of the sprue hook pin 320. Therefore, during the mold opening process of the injection mold 20, the sprue hook pin 320 moves with the movable mold mechanism 300, so that the sprue rubber is subjected to the tensile force of demoulding, so that the sprue rubber at the shear cut 102 can be pulled off and demoulded. It can be understood that in this embodiment, the number of ejector pins 310 is multiple, and can be correspondingly arranged according to the layout of the runner molding cavity 201 a in the actual injection mold 20 .

[0042] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A sprue bushing structure, characterized in that: include: A liquid inlet gate sleeve, wherein the liquid inlet gate sleeve is embedded in and connected to a fixed mold mechanism, the liquid inlet gate sleeve is provided with a main flow channel, the main flow channel comprises a first annular narrowing flow channel and a second connecting flow channel which are connected in sequence, the end of the second connecting flow channel which is away from the first annular narrowing flow channel is connected to the molding cavity, at least two demolding convex surfaces are formed on the inner wall of the first annular narrowing flow channel, an annular arc surface is formed at one end of the liquid inlet gate sleeve, the annular arc surface is used to abut against the nozzle of an injection molding machine, and a shear opening which is connected to the first annular narrowing flow channel is provided at the center point of the annular arc surface.

2. The sprue bushing structure according to claim 1, characterized in that: The liquid inlet gate sleeve is formed with a fixed hanging platform portion, the annular arc surface is located at the end surface of the fixed hanging platform portion, and the fixed hanging platform portion is screwed to the fixed mold mechanism.

3. The sprue bushing structure according to claim 1, characterized in that: The demoulding angle of the first annular narrowing flow channel is 45° to 60°.

4. The sprue bushing structure according to claim 1, characterized in that: The demoulding slope of the second connecting flow channel is 1° to 3°.

5. The sprue bushing structure according to claim 1, characterized in that: The shearing opening is arranged in a rectangular shape.

6. The sprue bushing structure according to claim 1, characterized in that: The polishing values ​​Ra of the inner wall of the first annular narrowing flow channel and the inner wall of the second connecting flow channel are less than 1.

6.

7. An injection mold, characterized in that: It comprises the gate sleeve structure described in any one of claims 1 to 6, wherein the injection mold further comprises a fixed mold mechanism and a movable mold mechanism, the fixed mold mechanism and the movable mold mechanism are detachably connected, and the clamping end of the fixed mold mechanism and the clamping end of the movable mold mechanism jointly form a molding cavity.

8. The injection mold according to claim 7, characterized in that: The molding cavity comprises a flow channel molding cavity and a plurality of plastic part molding cavities, the liquid inlet end of the flow channel molding cavity is communicated with the second connecting flow channel, and the plurality of branch liquid outlet ends of the flow channel molding cavity are communicated with each corresponding plastic part molding cavity.

9. The injection mold according to claim 8, characterized in that: The number of the plastic part molding cavities is at least two.

10. The injection mold according to claim 7, characterized in that: The movable mold mechanism includes an ejector pin and a sprue hook pin. The ejector pin is used to eject the molded plastic parts and runner plastic after the mold is opened. An annular groove is provided at the ejection end of the sprue hook pin. The ejection end of the sprue hook pin is aligned with the central axis of the second connecting runner.

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