A double-color injection mold of a rack and pinion driven rotating core

Abstract

The utility model discloses a kind of double-color injection mould of rack and pinion drive rotating core, including movable mould support assembly, rotating core cavity assembly, ejection driving assembly and rack and pinion rotary transmission assembly;Movable mould support assembly provides stable support, rotating core cavity assembly contains rotating core and two sides's first cavity, second cavity, respectively adapt hard glue, hard glue+soft glue area, ejection driving assembly drives rotating core to separate or reset, rack and pinion rotary transmission assembly drives rotating core rotation to realize cavity position interchanging.The utility model does not need the rotating disc mechanism of special double-color injection molding machine, can adapt monochrome machine to complete double-color injection molding, reduce equipment cost, shorten forming cycle, improve production efficiency and product quality stability, applicable to double-color ornament production in automotive interior etc..

Description

Technical Field

[0001] This utility model relates to the field of two-color injection mold technology, specifically to a two-color injection mold with a rack and pinion driven rotating core. Background Technology

[0002] In the field of injection molding of two-color products, such as two-color trim parts for automotive interiors, existing technologies generally employ a rotary mold-type two-color injection molding process. Specifically, this process uses a mold with two cavities: the first cavity is used for filling with a hard plastic material, and the second cavity is used for subsequent filling with a soft plastic material to achieve a two-color composite structure. The core of the entire process relies on the rotating mold mechanism of the injection molding machine.

[0003] However, the aforementioned existing technologies suffer from two major drawbacks, severely restricting production efficiency and cost control: 1. High equipment investment costs: This process relies on dedicated two-color injection molding machines and requires an additional high-precision moving mold turntable mechanism. Not only are the equipment purchase costs significantly higher than ordinary single-color injection molding machines, but regular maintenance and calibration of the turntable mechanism are also necessary, further increasing the total life-cycle cost of the equipment. Simultaneously, companies must scrap or idle their existing single-color injection molding machines, resulting in wasted fixed assets. 2. Long molding cycle: Due to the large size and heavy load of the moving mold turntable, a single rotation takes 13 seconds. This stage accounts for too high a proportion of the entire injection molding cycle, severely impacting capacity expansion and making it difficult to meet the demands of large-scale production. Therefore, a rack and pinion driven rotating core two-color injection mold is urgently needed. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a two-color injection mold with rack and pinion driven rotating core.

[0005] This utility model discloses a two-color injection mold for a rack and pinion driven rotating core, comprising:

[0006] The moving mold support assembly includes a moving mold core with an internal cavity for receiving the rotating core, an ejector plate connected below the moving mold core, and a base plate that supports the moving mold core and the ejector plate.

[0007] The rotating core cavity assembly includes a rotating core placed in the rotating core receiving cavity and a first cavity and a second cavity arranged on opposite sides of the rotating core. The cavity shape of the first cavity matches the hard plastic area of ​​the product, and the cavity shape of the second cavity reserves space for the hard plastic area of ​​the product and includes the shape of the soft plastic area of ​​the product. The first cavity and the second cavity can be interchanged by rotating the rotating core.

[0008] The ejection drive assembly includes an ejection power component fixed to the ejector plate and a rotating core push rod connecting the ejection power component and the rotating core. The ejection power component drives the rotating core and the first and second cavities to disengage or revert to the rotating core receiving cavity through the rotating core push rod.

[0009] A rack and pinion rotary transmission assembly includes a gear coaxially fixed to the lower end of a rotating core, a rack meshing with the gear, and a rotary power component connected to the rack. The rotary power component drives the rack to drive the gear to rotate, thereby driving the rotating core to rotate.

[0010] As a further improvement of this utility model, the rotating core receiving cavity includes a rotating core movable cavity formed on the moving mold core and extending vertically through it, allowing the rotating core to pass through vertically and rotate, as well as a first receiving cavity and a second receiving cavity located on opposite sides of the rotating core movable cavity, communicating with the rotating core movable cavity and used to receive the first cavity and the second cavity.

[0011] As a further improvement of this utility model, the rotation angle of the rotating core is 180°;

[0012] After the first cavity is rotated, it can be switched to the position of the original second cavity within the rotating core receiving cavity. After the second cavity is rotated, it can be switched to the position of the original first cavity within the rotating core receiving cavity.

[0013] As a further improvement of this utility model, the maximum stroke of the ejector power component is greater than the height of the rotating core, cavity one, and cavity two, so as to ensure that the rotating core and cavity one and cavity two can be completely detached from the rotating core receiving cavity.

[0014] As a further improvement of this utility model, the ejection power component includes any one of a hydraulic cylinder, a pneumatic cylinder, a motor, and an electric push rod.

[0015] As a further improvement of this utility model, the rotating power component is any one of a hydraulic cylinder, a pneumatic cylinder, a motor, and an electric push rod.

[0016] As a further improvement of this utility model, the connection position between the rotating core push rod and the rotating core is located at the central axis of the rotating core to ensure that the ejection power is transmitted evenly and to prevent the rotating core from tilting.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention uses a rack and pinion rotary transmission assembly to enable the mold to drive the core rotation itself, replacing the moving mold turntable mechanism of the existing dedicated two-color machine. With the core cavity assembly, enterprises do not need to purchase a dedicated two-color machine and can directly use the original single-color machine for production, saving equipment purchase costs, avoiding the idleness of single-color equipment, and eliminating the need to maintain the turntable mechanism, thus reducing the total life cycle cost.

[0019] This invention drives the rotating core to rotate through rack and pinion meshing transmission, which has a faster response and less inertia compared to existing large-load equipment turntables. Combined with the ejection drive component, it can quickly complete the ejection, 180° rotation and reset of the rotating core, significantly reducing the time required for the rotating core to rotate, compressing key time consumption, increasing the output per unit time, and adapting to large-scale production.

[0020] This invention provides stable support for each component through a moving mold support assembly, ensuring accurate positioning. The cavity design of the rotating core cavity assembly, combined with the uniformity of rack and pinion transmission and the alignment of the rotating core ejector rod with the rotating core center axis, can avoid rotating core offset and cavity misalignment, ensure the bonding accuracy of hard and soft rubber, reduce the defect rate, and improve product quality stability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a two-color injection mold for a rack and pinion driven rotating core, as disclosed in one embodiment of the present invention.

[0022] Figure 2 This is an assembly diagram of the moving mold core, rotating core cavity assembly, ejection drive assembly, and rack and gear rotation transmission assembly of a rack and gear driven rotating core two-color injection mold disclosed in one embodiment of the present invention.

[0023] Figure 3 This is an assembly diagram of the rotating core cavity assembly, ejection drive assembly, and rack and gear rotation transmission assembly of a two-color injection mold with rack and gear driven rotating core, as disclosed in one embodiment of this utility model.

[0024] Figure 4 This is an assembly diagram of the rotating core cavity assembly and ejection drive assembly of a rack and pinion driven rotating core two-color injection mold disclosed in one embodiment of the present invention.

[0025] Figure 5 This is a top view of the rotating core cavity assembly disclosed in one embodiment of the present invention.

[0026] In the picture:

[0027] 1. Base plate; 2. Ejector plate; 3. Moving mold core; 4. Rotating core cavity assembly; 41. Rotating core; 42. Cavity 1; 43. Cavity 2; 5. Ejection drive assembly; 51. Ejection power component; 52. Rotating core ejector rod; 6. Rack and pinion rotary transmission assembly; 61. Gear; 62. Rack; 63. Rotation power component. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The present invention will now be described in further detail with reference to the accompanying drawings:

[0032] like Figure 1-5As shown, a rack and pinion driven rotating core two-color injection mold according to the present invention includes a moving mold support assembly, a rotating core cavity assembly 4, an ejection drive assembly 5, and a rack and pinion rotation transmission assembly 6. The moving mold support assembly includes a moving mold core 3 with an internal rotating core receiving cavity, an ejector plate 2 connected below the moving mold core 3, and a base plate 1 supporting the moving mold core 3 and the ejector plate 2. The rotating core cavity assembly 4 includes a rotating core 41 placed within the rotating core receiving cavity and a first cavity 42 and a second cavity 43 arranged on opposite sides of the rotating core 41. The cavity shape of the first cavity 42 matches the hard plastic area of ​​the product, and the cavity shape of the second cavity 43 reserves space for the hard plastic area of ​​the product and includes the shape of the soft plastic area of ​​the product. The first cavity 42 and the second cavity 43... The position of cavity 43 is interchanged by rotating the core 41; the ejection drive assembly 5 includes an ejection power component 51 fixed on the ejector plate 2, and a core rod 52 connecting the ejection power component 51 and the core 41. The ejection power component 51 drives the core 41 and the first cavity 42 and the second cavity 43 to disengage or return to the core receiving cavity through the core rod 52; the rack and pinion rotation transmission assembly 6 includes a gear 61 coaxially fixed to the lower end of the core 41, a rack 62 meshing with the gear 61, and a rotation power component 63 connected to the rack 62. The rotation power component 63 drives the rack 62 to drive the gear 61 to rotate, thereby driving the core 41 to rotate around its axis, thereby realizing the position exchange between the first cavity 42 and the second cavity 43.

[0033] Specifically:

[0034] like Figure 1-2 As shown, in the above embodiment, preferably, the gear 61 and the rotating core 41 are fixed in the circumferential direction by a keyway, and the gear 61 and the rotating core 41 are fixed in the axial direction by a lock nut.

[0035] In the above embodiments, preferably, the rotating core receiving cavity includes a rotating core movable cavity formed on the moving mold core 3 and extending vertically through it, allowing the rotating core 41 to pass through vertically and rotate, and a first receiving cavity and a second receiving cavity located on opposite sides of the rotating core movable cavity, communicating with the rotating core movable cavity and used to receive a first cavity 42 and a second cavity 43. In this embodiment, the inner cavity shape of the first receiving cavity and the second receiving cavity is adapted to the outer shape of the first cavity 42 and the second cavity 43.

[0036] In the above embodiment, preferably, the rotation angle of the rotating core 41 is 180°; during actual rotation, after the first cavity 42 rotates, it can switch to the position of the original second cavity 43 in the rotating core cavity, and after the second cavity 43 rotates, it can switch to the position of the original first cavity 42 in the rotating core cavity.

[0037] like Figure 3As shown, in the above embodiment, preferably, the maximum stroke of the ejector power component 51 is greater than the height of the rotating core 41, the first cavity 42, and the second cavity 43, so as to ensure that the rotating core 41 and the first cavity 42 and the second cavity 43 can be completely detached from the rotating core receiving cavity.

[0038] In the above embodiments, preferably, the ejector power component 51 includes any one of a hydraulic cylinder, a pneumatic cylinder, a motor, and an electric push rod. In this embodiment, the ejector power component 51 is preferably a hydraulic cylinder, with multiple hydraulic cylinders arranged vertically. The cylinder ends of the multiple hydraulic cylinders are fixed to the ejector plate 2, and the extended ends of the multiple hydraulic cylinders are connected to and drive the rotating core ejector rod 52. In this embodiment, the rotating core ejector rod 52 can move up and down by extending and retracting the multiple hydraulic cylinders. In this embodiment, the rotating core ejector rod 52 and the multiple hydraulic cylinders are fixed by locking nuts.

[0039] In the above embodiment, preferably, the rotating core 41 is provided with a through hole for the rotating core push rod 52 to pass through, the upper end of the rotating core push rod 52 is placed in the through hole, and is interference-fitted with the through hole and welded to fix it.

[0040] like Figure 4-5 As shown, in the above embodiments, preferably, the rotary power component is any one of a hydraulic cylinder, a pneumatic cylinder, a motor, and an electric actuator. In this embodiment, the rotary power component is preferably a hydraulic cylinder.

[0041] In the above embodiment, preferably, the connection position between the rotating core push rod 52 and the rotating core 41 is located at the central axis of the rotating core 41 to ensure that the ejection power is transmitted evenly and to avoid the rotating core 41 from tilting.

[0042] In the above embodiments, preferably, in the rotating core cavity assembly 4, the first cavity 42 and the second cavity 43 are fixedly connected to the opposite sides of the rotating core 41, and the central axes of the first cavity 42 and the second cavity 43 are coplanar with the central axis of the rotating core 41.

[0043] In the above embodiment, preferably, the rack 62 is fixedly connected to the slider, which is slidably mounted on the guide rail, which is fixedly mounted inside the moving mold core 3. Through the guide rail and the slider, the direction of movement of the rack 62 is guided, ensuring that the travel path of the rack 62 does not deviate.

[0044] How to use this embodiment:

[0045] 1) Install the completed mold onto a standard single-color injection molding machine. After the mold is closed, the injection molding machine injects hard plastic material into the first receiving cavity of the moving mold core 3 (corresponding to the first cavity 42 on the rotating core 41). After the hard plastic cools and solidifies, the first stage of injection molding is completed.

[0046] 2) Start the ejection drive assembly 5 and the ejection power component 51. The ejection power component 51 drives the rotating core 41 (including the molded hard plastic part) to move vertically upward through the rotating core ejector rod 52 until the rotating core 41 is completely separated from the rotating core movable cavity of the moving mold core 3, so as to avoid interference between the rotating core 41 and the moving mold core 3 when rotating.

[0047] 3) Start the rotation power component 63 of the rack and pinion rotation transmission assembly 6. The rotation power component 63 drives the rack 62 to slide back and forth in the horizontal direction. The rack 62 drives the meshing gear 61 to rotate, which in turn drives the rotating core 41 to rotate synchronously by 180°, so that the original first cavity 42 (including the hard rubber part) is switched to the second receiving cavity position, and the original second cavity 43 is switched to the first receiving cavity position.

[0048] 4) The ejector power unit 51 reverses its action, and the rotating core 41 is driven to return to its vertical position downward through the rotating core ejector rod 52, so that the rotating core 41 falls back into the rotating core movable cavity of the moving mold core 3, ensuring that the first cavity 42 and the second cavity 43 are accurately embedded into the corresponding receiving cavity.

[0049] 5) Close the mold again. The injection molding machine injects soft plastic material into the second receiving cavity of the moving mold core 3 (corresponding to the first cavity 42 on the rotating core 41, which contains hard plastic parts). After the soft plastic and hard plastic are combined and cooled to form, the mold is opened and the product is taken out, completing one two-color injection molding cycle. The above steps can be repeated for continuous production.

[0050] Advantages of this utility model:

[0051] This utility model uses a rack and pinion rotary transmission component 6 to enable the mold to drive the rotating core 41 to rotate, replacing the existing moving mold turntable mechanism of a dedicated two-color machine. With the rotating core cavity component, enterprises do not need to purchase a dedicated two-color machine and can directly use the original single-color machine for production, saving equipment purchase costs, avoiding the idleness of single-color equipment, and eliminating the need to maintain the turntable mechanism, thus reducing the total life cycle cost.

[0052] This invention drives the rotating core 41 to rotate through the meshing transmission of rack 62 and gear 61. Compared with the existing large-load equipment turntable, it has a faster response and less inertia. Combined with the ejection drive component, it can quickly complete the ejection, 180° rotation and reset of the rotating core. The time required for the rotating core to rotate is significantly reduced, which can be compressed to 8 seconds. This reduces key time consumption, increases the production capacity per unit time, and is suitable for large-scale production.

[0053] This utility model provides stable support for each component through the moving mold support assembly, ensuring accurate positioning; the cavity design of the rotating core cavity assembly, combined with the uniformity of the transmission of the rack 62 and gear 61, and the alignment of the rotating core ejector rod 52 and the central axis of the rotating core 41, can avoid the rotation of the rotating core 41 and the misalignment of the cavity, ensuring the accuracy of hard and soft rubber bonding, reducing the defect rate, and improving the stability of product quality.

[0054] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A two-color injection mold for a rack and pinion driven rotating core, characterized in that, include: The moving mold support assembly includes a moving mold core (3) with an internal cavity for receiving the rotating core, an ejector plate (2) connected below the moving mold core (3), and a base plate (1) supporting the moving mold core (3) and the ejector plate (2). The rotating core cavity assembly (4) includes a rotating core (41) placed in the rotating core receiving cavity and a first cavity (42) and a second cavity (43) arranged on opposite sides of the rotating core (41). The cavity shape of the first cavity (42) matches the hard plastic area of ​​the product, and the cavity shape of the second cavity (43) reserves space for the hard plastic area of ​​the product and includes the shape of the soft plastic area of ​​the product. The first cavity (42) and the second cavity (43) can be interchanged by rotating the rotating core (41). The ejection drive assembly (5) includes an ejection power component (51) fixed on the ejector plate (2) and a rotating core push rod (52) connecting the ejection power component (51) and the rotating core (41). The ejection power component (51) drives the rotating core (41) and the first cavity (42) and the second cavity (43) to disengage or return to the rotating core receiving cavity through the rotating core push rod (52). The rack and pinion rotary transmission assembly (6) includes a gear (61) coaxially fixed to the lower end of the rotating core (41), a rack (62) meshing with the gear (61), and a rotary power component (63) connected to the rack (62). The rotary power component (63) drives the rack (62) to drive the gear (61) to rotate, thereby driving the rotating core (41) to rotate.

2. The two-color injection mold according to claim 1, characterized in that, The rotating core receiving cavity includes a rotating core movable cavity that is opened on the moving mold core (3) and runs vertically through it, allowing the rotating core (41) to pass through vertically and rotate, and a first receiving cavity and a second receiving cavity that are located on opposite sides of the rotating core movable cavity, communicate with the rotating core movable cavity, and are used to receive the first cavity (42) and the second cavity (43).

3. The two-color injection mold according to claim 1, characterized in that, The rotation angle of the rotating core (41) is 180°; After the first cavity (42) is rotated, it can be switched to the position of the original second cavity (43) in the rotating core cavity. After the second cavity (43) is rotated, it can be switched to the position of the original first cavity (42) in the rotating core cavity.

4. The two-color injection mold according to claim 1, characterized in that, The maximum stroke of the ejector power component (51) is greater than the height of the rotating core (41), the first cavity (42), and the second cavity (43) to ensure that the rotating core (41) and the first cavity (42) and the second cavity (43) can be completely separated from the rotating core receiving cavity.

5. The two-color injection mold according to claim 1 or 4, characterized in that, The ejection power component (51) includes any one of a hydraulic cylinder, a pneumatic cylinder, a motor, and an electric push rod.

6. The two-color injection mold according to claim 1, characterized in that, The rotary power component (63) is any one of a hydraulic cylinder, a pneumatic cylinder, a motor, and an electric push rod.

7. The two-color injection mold according to claim 1, characterized in that, The connection point between the rotating core push rod (52) and the rotating core (41) is located at the central axis of the rotating core (41) to ensure that the ejection power is transmitted evenly and to prevent the rotating core from tilting.

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