Rearview mirror mold for local surface gas-assisted pressure-maintaining molding

Abstract

The rearview mirror mold comprises a fixed mold body, an air needle structure is arranged in the fixed mold body and comprises an air needle sleeve and an air needle core arranged in the air needle sleeve in a sliding mode, and an inner cavity of the air needle sleeve is tightly attached to the outer wall of the air needle core. The side face of the bottom, the middle area of the central axis and the side face of the top of the gas needle core are provided with communicated gas channels, the gas channels are in a C shape, and when the gas pressure in the gas needle structure is larger than that in a mold cavity, the tops of the gas channels are communicated with the mold cavity. The needle sleeve and the gas needle core are tightly attached and arranged in a sliding mode, so that the gas needle core is stable and small in abrasion when moving, meanwhile, the gas channel is arranged in a C shape, gas is decelerated through friction of multiple bends when continuously passing through the gas channel, and the speed of the gas entering a mold cavity can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of molds, and in particular to a rearview mirror mold for local surface gas-assisted pressure holding molding. Background Art

[0002] Rearview mirrors are generally produced through injection molds. During the injection molding process, due to the fluidity of the raw materials and the design of the molds, defects such as air holes and air streaks are likely to appear inside, and due to the shrinkage effect during molding, the molded products are likely to have defects. These defects not only affect the appearance quality of the molded rearview mirrors, but also reduce their strength, durability, and service life. The air needle structure can make the semi-finished product that has not been fully shaped be pressed by the air pressure and fit with the mold cavity, thus helping to form a rearview mirror product with better appearance and fewer or no defects.

[0003] In the existing air needle structure, there is a gap between the air needle core and the air needle sleeve for gas passage. However, the gap between the air needle core and the air needle sleeve makes the air needle core prone to tilt without stable limiting. After tilting, the local gas passage becomes narrower and is prone to blockage. On the other hand, at the moment when the gas passage is connected to the mold cavity, due to the narrow passage generated, the initial gas velocity is relatively large, which is likely to impact the injection molded product or the mold. Summary of the Invention

[0004] The purpose of this application is to provide a rearview mirror mold for local surface gas-assisted pressure holding molding.

[0005] To achieve the above purpose, the technical solution adopted in this application is: a rearview mirror mold for local surface gas-assisted pressure holding molding, including a fixed mold. An air needle structure is arranged inside the fixed mold. The air needle structure includes an air needle sleeve and an air needle core slidably arranged inside the air needle sleeve. The inner cavity of the air needle sleeve is in close fit with the outer wall of the air needle core. Gas passages are opened on the bottom side, the middle region of the central axis, and the top side of the air needle core, and the gas passages are C-shaped. When the air pressure inside the air needle structure is greater than the air pressure inside the mold cavity, the top of the gas passages is connected to the mold cavity.

[0006] As a preference, the air needle structure further includes an air inlet component. The air inlet component includes an air chamber and a piston. The air chamber is hermetically connected to the bottom of the air needle sleeve. In the initial state, the bottom of the air needle core elastically abuts against the piston, so that the piston cooperatively seals the opening at the top of the air chamber.

[0007] As a preference, a sealing ring is arranged at the connection between the air needle sleeve and the air chamber. The top of the piston and the opening at the top of the air chamber are conical, and the cone at the top of the piston faces the direction of the sealing ring.

[0008] As a preference, the air needle core includes a top section, a middle section, and a bottom section. The outer diameters of the top section and the bottom section are both larger than that of the middle section. The inner cavity of the air needle sleeve successively forms a first groove, a second groove, and a third groove from top to bottom. The outer diameters of the first groove, the second groove, and the third groove are respectively equal to the outer diameters of the top section and the bottom section; the length of the second groove is less than that of the middle section.

[0009] As a preference, a spring is provided on the outer side of the bottom of the middle section. The top of the spring abuts against the second groove

[0010] As a preference, the connection part of the third groove abuts against each other. The bottom of the spring abuts against the bottom section, so that in the initial state, the top section is completely located in the first groove, and the top surface of the top section is flush with the bottom surface of the mold cavity.

[0011] As a preference, a flow buffer cavity is formed at the top of the gas channel, and the flow buffer cavity is arranged in a wavy shape.

[0012] As a preference, the air needle sleeve includes a limit seat provided at the top. The outer wall of the air needle sleeve below the limit seat is provided with an external thread, and the air needle sleeve is fixedly connected to the fixed mold through the external thread.

[0013] As a preference, an installation groove is provided below the position where the air needle sleeve is installed on the fixed mold. The top of the installation groove is widened to form a gasket installation part. The air inlet component is fixedly installed in the installation groove, and the sealing ring is installed in the gasket installation part.

[0014] As a preference, an O-ring is provided at the bottom of the connection position between the air needle sleeve and the air needle core.

[0015] Compared with the prior art, the beneficial effects of this application are as follows:

[0016] The air needle sleeve and the air needle core are closely attached and can slide, which makes the air needle core stable and less worn when moving. At the same time, due to the C-shaped setting of the gas channel, the gas is frictionally decelerated through multiple bends when continuously passing through, which helps to reduce the speed of the gas when entering the mold cavity. Description of the Drawings

[0017] Figure 1 is a schematic diagram of installing the air needle structure at the fixed mold of this application.

[0018] Figure 2 is Figure 1 a schematic diagram of the air needle structure in

[0019] Figure 3 is a schematic diagram of the connection part between the air inlet component and the air needle structure.

[0020] Figure 4 It is a change diagram of the top of the gas passage after adding a slow flow cavity.

[0021] In the figure: 1. Fixed mold; 2. Gas needle sleeve; 3. Gas needle core; 4. Gas passage; 5. Spring; 6. Third groove body; 7. Bottom section; 8. Sealing ring; 9. Piston; 10. Intake component; 11. Air chamber; 12. Buffer cavity; 13. Middle section; 14. O-ring. Specific implementation manners

[0022] Next, in combination with specific implementation manners, the present application will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0023] In the description of the present application, it should be noted that for orientation terms, such as terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and position relationships are based on the orientation or position relationships shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present application.

[0024] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence.

[0025] The terms "comprising" and "having" in the description and claims of the present application and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0026] Embodiment:

[0027] Refer to Figures 1 to 4, this embodiment proposes a rearview mirror mold for local surface gas-assisted pressure maintaining molding, which includes a fixed mold 1. An air needle structure is arranged inside the fixed mold 1. The air needle structure includes an air needle sleeve 2 and an air needle core 3 slidably arranged inside the air needle sleeve 2. The inner cavity of the air needle sleeve 2 is in close fit with the outer wall of the air needle sleeve 2. Gas channels 4 are opened on the bottom side, the middle region of the central axis, and the top side of the air needle core 3, and when the air pressure inside the air needle structure is greater than the air pressure inside the mold cavity, the top of the gas channel 4 communicates with the mold cavity. The air needle sleeve 2 and the air needle core 3 are in close fit, which can ensure the sealing performance when the air needle core 3 moves up and down.

[0028] This mold is mainly used for the injection molding of rearview mirrors. In some cases, through the design of the mold, the air needle structure proposed in this embodiment may also be applicable to the injection production of other products.

[0029] In the prior art, the air needle core 3 is located at the center of the air needle sleeve 2. The gap between the air needle core 3 and the air needle sleeve 2 is ventilated to form the gas channel 4, and finally a spring 5 is used to limit the moving direction of the air needle core 3; Subsequently, an air source is arranged at the bottom of the air needle core 3. When the air pressure provided by the air source is greater than the pressure inside the mold cavity, the air source pushes the air needle core 3 upward, thereby opening the gas channel 4. Obviously, the spring 5 itself is prone to bending, so the limit by the spring 5 is not stable enough. To a certain extent, the air needle core 3 is prone to shift from the center of the inner cavity of the air needle sleeve 2 or even tilt. On the one hand, after tilting, the gap between the air needle core 3 and the air needle sleeve 2 is locally reduced, which is prone to blockage. On the other hand, wear is likely to occur between the tilted air needle core 3 and the air needle sleeve 2, which is not conducive to maintaining the sealing performance.

[0030] In this embodiment, the air needle core 3 and the air needle sleeve 2 are closely attached, so when the air needle core 3 moves up and down, there is no need to consider the problems of wear and tilt. However, at this time, the gas channel 4 needs to be set separately. Therefore, in this embodiment, the gas channel 4 is as Figure 2 shown, and it forms a gas channel 4 similar to a C shape as a whole. This channel is formed on the bottom side wall, the center, and the top side wall of the air needle core 3. In the prior art, there is also a case where the gas channel 4 of the air needle is arranged on the air needle core 3. The difference in this embodiment is that it starts to be introduced from the bottom side wall of the air needle core 3, passes through the center of the middle part of the air needle core 3 and goes up to the side wall at the top and is discharged into the mold cavity. Since when the air needle core 3 moves upward to just communicate with the mold cavity, the gas in the gas channel 4 has a relatively large initial velocity when it is discharged all at once in the just-opened narrow channel, which may cause damage to both the mold and the injection-molded product. Through the C-shaped setting of the gas channel 4 in this embodiment, the gas undergoes frictional deceleration through multiple bends during continuous passage, which helps to reduce the occurrence of this problem.

[0031] The air needle structure further includes an air inlet component 10, which includes an air chamber 11 and a piston 9. The bottom of the air chamber 11 is hermetically connected to the bottom of the air needle sleeve 2. In the initial state, the bottom of the air needle core 3 elastically abuts against the piston 9, so that the piston 9 cooperatively seals the opening at the top of the air chamber 11. The air inlet component 10 is the component for the air source to act on the air needle core 3. The principle is that the air source acts on the piston 9, and the pressure in the mold cavity causes the top of the air needle core 3 to be initially molded downward. The bottom of the air needle core 3 acts on the piston 9. When the air source pressure is greater than the molding pressure, at this time the air needle core 3 can push the piston 9 upward, and then the top of the air needle core 3 will push up the injection molded product.

[0032] To ensure the sealing performance, as Figure 2 , 3 shown, a sealing ring 8 is provided at the connection between the air needle sleeve 2 and the air chamber 11; an O-ring 14 is provided at the bottom of the connection position between the air needle sleeve and the air needle core; the top of the piston 9 and the opening at the top of the air chamber 11 are conical, and the cone at the top of the piston 9 faces the direction of the sealing ring 8. The conical opening at the top of the air chamber 11 has a guiding effect. When the piston 9 rises and opens, for a moment, the gas in the air chamber 11 enters the connection between the air needle sleeve 2 and the air chamber 11 at a relatively high speed. At this time, the provided sealing ring 8 allows the gas to directly rush towards the sealing ring 8 for buffering, thereby reducing component damage. The sealing ring 8 is a consumable part, which is convenient for replacement and has a low cost.

[0033] As Figure 2 shown, the air needle core 3 includes a top section, a middle section 13 and a bottom section 7. The outer diameters of the top section and the bottom section 7 are both larger than the outer diameter of the middle section 13. The inner cavity of the air needle sleeve 2 successively forms a first groove, a second groove and a third groove 6 from top to bottom. The outer diameters of the first groove, the second groove and the third groove 6 are respectively equal to the outer diameters of the top section and the bottom section 7; the length of the second groove is less than the length of the middle section 13. A spring 5 is provided on the outer side of the bottom of the middle section 13. The top of the spring 5 abuts against the connection between the second groove and the third groove 6, and the bottom of the spring 5 abuts against the bottom section 7, so that in the initial state, the top section is completely located in the first groove, and the top surface of the top section is flush with the bottom surface of the mold cavity. The top surface of the top is the position where the air needle core 3 acts on the injection molded product. The sliding fit between the middle section 13 and the second groove ensures the stable up and down movement of the air needle core 3. The bottom section 7 restricts the upward movement of the air needle core 3. In cooperation with the setting of the spring 5, the bottom section 7 abuts against the piston 9 in the initial state.

[0034] As Figure 4 shown, the top of the gas channel 4 in the initial state is like Figure 4 the straight structure in the upper part in Figure 4 shown. A flow buffer cavity 12 is formed at the top of the gas channel 4 in this embodiment.

[0035] To facilitate the installation of the air needle sleeve 2, the air needle sleeve 2 includes a limit seat provided at the top. The outer wall of the air needle sleeve 2 below the limit seat is provided with an external thread, and the air needle sleeve 2 is fixedly connected to the fixed mold 1 through the external thread. To facilitate the installation of the air inlet component 10, the fixed mold 1 is provided with an installation groove below the position where the air needle sleeve 2 is installed. The top of the installation groove is widened to form a gasket installation portion. The air inlet component 10 is fixedly installed in the installation groove, and the sealing ring 8 is installed in the gasket installation portion.

[0036] The above describes the basic principle, main features and advantages of the present application. Those skilled in the art of this industry should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present application. Without departing from the spirit and scope of the present application, the present application will have various changes and improvements, and these changes and improvements all fall within the scope of the present application claimed. The scope of protection required by the present application is defined by the appended claims and their equivalents.

Claims

1. A rearview mirror mold for local surface gas-assisted pressure-maintaining forming, characterized in that, It includes a fixed mold, and an air needle structure is arranged inside the fixed mold. The air needle structure includes an air needle sleeve and an air needle core slidably arranged inside the air needle sleeve. The inner cavity of the air needle sleeve is in close fit with the outer wall of the air needle core. A communicating gas channel is formed on the bottom side, the middle region of the central axis, and the top side of the air needle core. The gas channel is C-shaped. When the air pressure inside the air needle structure is greater than the air pressure inside the mold cavity, the top of the gas channel communicates with the mold cavity.

2. The rearview mirror mold for local surface gas-assisted pressure maintaining molding according to claim 1, characterized in that, The air needle structure further includes an air inlet component. The air inlet component includes an air chamber and a piston. The air chamber is hermetically connected to the bottom of the air needle sleeve. In the initial state, the bottom of the air needle core elastically abuts against the piston, so that the piston cooperatively seals the opening at the top of the air chamber.

3. The rearview mirror mold for local surface gas-assisted pressure maintaining molding according to claim 2, wherein A sealing ring is arranged at the connection between the air needle sleeve and the air chamber; the top of the piston and the opening at the top of the air chamber are conical, and the cone at the top of the piston faces the direction of the sealing ring.

4. The rearview mirror mold for local surface gas-assisted pressure maintaining molding according to claim 3, wherein, The air needle core includes a top section, a middle section, and a bottom section. The outer diameters of the top section and the bottom section are both greater than the outer diameter of the middle section. The inner cavity of the air needle sleeve sequentially forms a first groove, a second groove, and a third groove from top to bottom. The outer diameters of the first groove, the second groove, and the third groove are respectively equal to the outer diameters of the top section and the bottom section; the length of the second groove is less than the length of the middle section.

5. The rearview mirror mold for local surface gas-assisted pressure maintaining molding according to claim 4, characterized in that, A spring is arranged on the outer side of the bottom of the middle section. The top of the spring abuts against the connection between the second groove and the third groove, and the bottom of the spring abuts against the bottom section, so that in the initial state, the top section is completely located inside the first groove, and the top surface of the top section is flush with the bottom surface of the mold cavity.

6. The rearview mirror mold for local surface gas-assisted pressure maintaining molding according to claim 1, characterized in that, A flow buffer cavity is formed at the top of the gas channel, and the flow buffer cavity is arranged in a wavy shape.

7. The rearview mirror mold for local surface gas-assisted pressure maintaining molding according to claim 3, characterized in that, The air needle sleeve includes a limit seat arranged at the top. The outer wall of the air needle sleeve below the limit seat is provided with an external thread, and the air needle sleeve is fixedly connected to the fixed mold through the external thread.

8. The rearview mirror mold for local surface gas-assisted pressure maintaining forming according to claim 7, characterized in that, Below the position where the air needle sleeve is installed on the fixed mold, an installation groove is provided. The top of the installation groove is widened to form a gasket installation part. The air inlet component is fixedly installed in the installation groove, and the sealing ring is installed in the gasket installation part.

9. The rearview mirror mold for local surface gas-assisted pressure maintaining molding according to claim 1, characterized in that, An O-ring is arranged at the bottom of the connection position between the air needle sleeve and the air needle core.

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