An injection mold with interchangeable cavities and single-side demoulding

Abstract

The present invention discloses an injection mold with interchangeable cavities and single-sided demolding, comprising a movable mold and a fixed mold. The fixed mold is provided with a fixed mold turntable, and the fixed mold turntable has two fixed mold cavities, which have the same structure and are arranged symmetrically with respect to the center. A fixed mold turntable drive device is provided on one side of the fixed mold, and the fixed mold turntable drive device drives the two fixed mold cavities to interchange positions. Two fixed mold ejection mechanisms corresponding to the positions of the two fixed mold cavities are provided on the inner side of the fixed mold turntable, and the two fixed mold ejection mechanisms synchronously interchange positions with the two fixed mold cavities. Each fixed mold ejection mechanism is provided with an inclined ejector, which is slidably engaged with the fixed mold, and one end of which is movably connected to the fixed mold ejection mechanism. The fixed mold of the present invention is provided with a fixed mold ejection mechanism, and the core puller is movably engaged with the fixed mold ejection mechanism. When the mold is opened, the movable mold drives the ejection mechanism to move together through the second nylon clamping mold. The ejection mechanism drives the core puller to exit the undercut, and the fixed mold ejector rod ejects the final product part, causing it to be separated from the fixed mold cavity.

Description

Technical Field

[0001] The invention relates to the technical field of mold manufacturing, in particular to an injection mold with interchangeable cavities and single-side demoulding. Background Art

[0002] The combined structure of automotive plastic parts needs to be injection molded separately and then assembled together. For example, parts A, B, and C need to be injection molded separately using three sets of molds. After molding, they are removed from their respective molds and assembled together externally. Each part requires a separate set of molds to produce, which results in high equipment costs, large floor space, complex processes, and low production efficiency. A mold that can achieve in-mold assembly is needed. To mold a combined structure of three parts in one mold, two of the parts must be injection molded first, then the two parts are repositioned so that they overlap, and then the other part is injection molded to obtain the final combined structure. Because the final part has a large undercut in the ejection direction after molding, core pulling needs to be set on the fixed mold side, and the final part must remain in the movable mold when the mold is opened. This makes it difficult for the final part to escape from the fixed mold cavity when the mold is opened, resulting in the final part being pulled apart. Therefore, the existing technology urgently needs to be further improved. Summary of the Invention

[0003] In view of the deficiencies of the above-mentioned prior art, the purpose of the present invention is to propose an injection mold with interchangeable cavity and single-sided demolding, so as to solve the problem that the final product has a large undercut in the demolding direction after molding, the core pulling needs to be set on the fixed mold side, and the final product is required to leave the movable mold when the mold is opened, which makes it difficult for the final product to separate from the cavity of the fixed mold when the mold is opened, resulting in the final product being pulled apart.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] The invention discloses an injection mold with interchangeable cavities and single-side demoulding, comprising a movable mold and a fixed mold. The movable mold and the fixed mold are arranged opposite to each other. The fixed mold is provided with a fixed mold turntable. The fixed mold turntable is a disc structure and is movably installed in an embedded manner on the side of the fixed mold close to the movable mold.

[0006] The fixed mold turntable is provided with two fixed mold cavities on one side adjacent to the movable mold. The two fixed mold cavities have the same structure and are centrally symmetrically arranged.

[0007] A fixed mold turntable driving device is provided on the side of the fixed mold away from the movable mold, and the fixed mold turntable driving device drives the two fixed mold cavities to exchange positions.

[0008] Two fixed mold ejection mechanisms corresponding to the positions of the two fixed mold cavities are provided on the inner side of the fixed mold turntable, and the two fixed mold ejection mechanisms and the two fixed mold cavities exchange positions synchronously.

[0009] Each fixed mold ejection mechanism is provided with an inclined ejector, which is slidably matched with the fixed mold and one end of which is movably connected to the fixed mold ejection mechanism.

[0010] Furthermore, the movable mold and the fixed mold are adjacent to each other on one side, and have two movable mold cores with different structures. Any fixed mold cavity can be matched with the two movable mold cores.

[0011] Any fixed mold cavity can cooperate with one of the dynamic mold cores to form an injection cavity for the intermediate product. After the mold is opened, the intermediate product remains on the fixed mold turntable. After the fixed mold turntable rotates 180°, the fixed mold cavity with the intermediate product cooperates with another dynamic mold core to form the injection cavity for the final product.

[0012] Furthermore, the fixed mold turntable driving device includes a gear rack mechanism, a first rotating shaft and a first oil cylinder. The first rotating shaft cooperates with the fixed mold through a ball bearing, and one end of the first rotating shaft is fixedly connected to the fixed mold turntable.

[0013] The first oil cylinder is fixedly mounted on the fixed mold, and the piston rod of the first oil cylinder drives the first rotating shaft to rotate through a gear rack mechanism, and the first rotating shaft drives the fixed mold turntable to rotate around its axis.

[0014] Furthermore, the rack and pinion mechanism includes a gear and a rack, the gear is fixedly sleeved on the first rotating shaft, the rack is linearly slidably matched with the fixed mold through the first slider, and the piston rod of the first oil cylinder is connected to the first slider.

[0015] Two travel switches are provided on one side of the first oil cylinder, and the two travel switches are installed on the fixed mold with relative intervals. The first slider is provided with a signal rod, one end of the signal rod is fixedly connected to the first slider, and the other end is located between the two travel switches.

[0016] Furthermore, a turntable positioning mechanism is provided on the fixed mold, and the turntable positioning mechanism includes a limit block and two stop blocks. The two stop blocks are respectively fixed on opposite sides of the fixed mold turntable and rotate with the fixed mold turntable.

[0017] The limit blocks are located on the outside of the fixed mold turntable and are fixedly connected to the fixed mold. The limit blocks cooperate with the stop blocks to position the rotation angle of the fixed mold turntable.

[0018] Furthermore, two first nylon locking buckles are symmetrically fixed on one side of the fixed mold turntable close to the movable mold, and the movable mold is provided with locking sleeves corresponding to the two first nylon locking buckles respectively.

[0019] Furthermore, the fixed mold ejection mechanism includes an ejector plate and a fixed mold ejector rod arranged on the ejector plate, one end of the fixed mold ejector rod is fixedly connected to the ejector plate, and the other end extends into the fixed mold turntable and slides with it.

[0020] Furthermore, each ejector plate is symmetrically provided with two return rods, one end of each return rod is fixedly connected to the ejector plate, and the other end passes through the fixed mold turntable and is provided with a second nylon locking buckle.

[0021] The movable mold is provided with two locking sleeves that cooperate with the second nylon locking buckles at the ends of the two return rods at the position of forming the final product. The second nylon locking buckles at the ends of the two return rods at the position of forming the intermediate product are avoided on the movable mold side.

[0022] Furthermore, a slide rail is fixedly provided on the ejector plate, a second sliding block is provided on the slide rail and slidably cooperates with the second sliding block, and one end of the inclined ejector is hinged to the second sliding block.

[0023] Furthermore, the fixed mold has a turntable installation cavity that matches the fixed mold turntable, and the outer side wall of the fixed mold turntable and the inner side wall of the turntable installation cavity are both conical surfaces.

[0024] By adopting the above technical solution, the beneficial technical effect of the present invention is as follows: a fixed mold ejection mechanism is provided on the fixed mold of the present invention, and the core pulling mechanism is movably coordinated with the fixed mold ejection mechanism. When the mold is opened, the movable mold drives the ejection mechanism to move together through the second nylon clamping mold, and the ejection mechanism drives the core pulling mechanism to exit the undercut, and the fixed mold ejector pusher ejects the final product part to separate it from the fixed mold cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the main part of the one-side demoulding of an interchangeable cavity according to the present invention.

[0026] Figure 2 yes Figure 1 The structural diagram of a part of the present invention is shown in FIG. 1 , which shows the fixed mold turntable and the fixed mold turntable driving device.

[0027] Figure 3 yes Figure 1 The structural diagram of another part of the present invention is shown in FIG. 1 , which shows the fixed mold turntable and related components.

[0028] Figure 4 yes Figure 1 The enlarged view of the local structure of the present invention shows the inclined roof and its related components. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings:

[0030] Combine Figures 1 to 4An injection mold with interchangeable cavities and single-sided demolding includes a movable mold and a fixed mold 2, which are arranged opposite each other. The fixed mold 2 is provided with a fixed mold turntable 21. The fixed mold turntable 21 is a circular disc structure and is movably mounted in an embedded manner on the side of the fixed mold 2 near the movable mold. The fixed mold 2 has a turntable mounting cavity that mates with the fixed mold turntable 21. The outer wall of the fixed mold turntable 21 and the inner wall of the turntable mounting cavity are both tapered surfaces.

[0031] The stationary mold turntable 21 has two stationary mold cavities 23 on one side adjacent to the movable mold. The two stationary mold cavities 23 have the same structure and are arranged symmetrically around the center. A stationary mold turntable drive device 6 is provided on the side of the stationary mold 2 facing away from the movable mold. The stationary mold turntable drive device 6 drives the two stationary mold cavities 23 to interchange positions.

[0032] The fixed mold turntable drive device 6 includes a gear 62 and rack 63 mechanism, a first rotating shaft 61, and a first oil cylinder 64. The first rotating shaft 61 is engaged with the fixed mold 2 via a ball bearing, and one end of the first rotating shaft 61 is fixedly connected to the fixed mold turntable 21. The first oil cylinder 64 is fixedly mounted on the fixed mold 2. The piston rod of the first oil cylinder 64 drives the first rotating shaft 61 to rotate through the gear 62 and rack 63 mechanism. The first rotating shaft 61 drives the fixed mold turntable 21 to rotate about its axis.

[0033] The gear 62-rack 63 mechanism includes a gear 62 and a rack 63. The gear 62 is fixedly mounted on the first rotating shaft 61. The rack 63 slides linearly with the fixed mold 2 via a first slider 65. The piston rod of the first oil cylinder 64 is connected to the first slider 65. Two travel switches 67 are installed on one side of the first oil cylinder 64, spaced apart from each other and mounted on the fixed mold 2. The first slider 65 is equipped with a signal rod 66, one end of which is fixedly connected to the first slider 65 and the other end is located between the two travel switches 67.

[0034] The fixed mold 2 is provided with a turntable positioning mechanism 5, which includes a limit block 51 and two stops 52. The two stops 52 are fixed to opposite sides of the fixed mold turntable 21 and rotate with the fixed mold turntable 21. The limit block 51 is located outside the fixed mold turntable 21 and is fixedly connected to the fixed mold 2. The limit block 51 cooperates with the stop blocks 52 to determine the rotation angle of the fixed mold turntable 21.

[0035] The movable mold has two movable cores with different structures on one side adjacent to the fixed mold 2. Any fixed mold cavity 23 can cooperate with both movable cores. Any fixed mold cavity 23 can cooperate with one of the movable cores to form an injection cavity for the intermediate product. The injection molding machine injects hard plastic into the injection cavity to form the intermediate product.

[0036] After the first mold opening, the intermediate product part remains on the fixed mold turntable 21, and the fixed mold turntable driving device 6 drives the fixed mold turntable 21 to rotate 180° around the first rotating shaft 61. After the fixed mold turntable 21 rotates 180°, the movable mold and the fixed mold 2 are closed, and the fixed mold cavity 23 with the intermediate product part cooperates with another movable mold core to form the final product part injection cavity. The injection molding machine injects soft glue into the intermediate product part injection cavity to form the final product part. The final product part is a two-color injection molded part. After the second mold opening, the final product part is ejected from the movable mold side.

[0037] Two first nylon locking buckles 25 are symmetrically fixed on one side of the fixed mold turntable 21 close to the movable mold. The movable mold is provided with locking sleeves corresponding to the two first nylon locking buckles 25. After the movable mold and the fixed mold 2 are closed, each first nylon locking buckle 25 is located in the corresponding locking sleeve. When the mold is opened, the friction resistance of the locking sleeve to the first nylon locking buckle 25 pulls the fixed mold turntable 21 outward by 5mm, so that the fixed mold turntable 21 and the fixed mold 2 are separated by a certain gap, thereby avoiding the friction resistance of the fixed mold 2 when the fixed mold turntable 21 rotates.

[0038] Two fixed mold ejection mechanisms 7 are located inside the fixed mold turntable 21, corresponding to the positions of the two fixed mold cavities 23. The two fixed mold ejection mechanisms 7 exchange positions synchronously with the two fixed mold cavities 23. The fixed mold ejection mechanism 7 includes an ejector plate 71 and a fixed mold ejector rod 72 disposed on the ejector plate 71. One end of the fixed mold ejector rod 72 is fixedly connected to the ejector plate 71, and the other end extends into the fixed mold turntable 21 and slides with it. The fixed mold ejector rod 72 moves synchronously with the ejector plate 71.

[0039] Each ejector plate 71 is symmetrically equipped with two return rods. One end of each return rod is fixedly connected to the ejector plate 71, and the other end extends through the fixed mold turntable 21 and is equipped with a second nylon clamping buckle 26. The movable mold is equipped with two clamping sleeves that mate with the second nylon clamping buckles 26 at the ends of the two return rods in the position for molding the final product. The second nylon clamping buckles 26 at the ends of the two return rods in the position for molding the intermediate product are kept out of the air on the movable mold side.

[0040] When the mold is opened, the intermediate product piece remains in the fixed mold cavity 23 where it is located, and the fixed mold ejector pin 72 corresponding to the position of the fixed mold cavity 23 where the intermediate product piece is located does not move.

[0041] Each fixed mold ejection mechanism 7 is provided with a slanted ejector 8, which is in sliding engagement with the fixed mold 2 and has one end movably connected to the fixed mold ejection mechanism 7. A slide rail 81 is fixedly provided on the ejector plate 71, and a second slider 82 is provided on the slide rail for sliding engagement therewith, and one end of the slanted ejector 8 is hingedly connected to the second slider 82.

[0042] During mold opening, the inclined ejector 8 must exit the undercut to allow the fixed mold cavity 23 of the fixed mold 2 to separate from the final product, ensuring that the final product remains on the movable mold side. At the moment of mold opening, the movable mold moves while the fixed mold 2 does not. The second nylon clamping buckle 26, subjected to frictional resistance from its mating clamping sleeve, moves 30 mm in sync with the movable mold. After the fixed mold 2 drives the inclined ejector 8 out of the undercut, the second nylon clamping buckle 26 disengages from the corresponding clamping sleeve, disengaging the fixed mold ejector pin 72 from the final product, and the final product is ejected from the movable mold side.

[0043] Parts not described in the present invention can be implemented by adopting or drawing on existing technologies.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the present invention.

[0045] In addition, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0046] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. An injection mold with interchangeable cavities and single-side demoulding, characterized in that: It includes a movable mold and a fixed mold, which are arranged opposite to each other. The fixed mold is provided with a fixed mold turntable, which is a disc structure and is movably installed in an embedded manner on the side of the fixed mold close to the movable mold. There are two fixed mold cavities on one side of the fixed mold turntable adjacent to the movable mold. The two fixed mold cavities have the same structure and are arranged symmetrically around the center. A fixed mold turntable driving device is provided on the side of the fixed mold away from the movable mold, and the fixed mold turntable driving device drives the two fixed mold cavities to exchange positions; Two fixed mold ejection mechanisms corresponding to the positions of the two fixed mold cavities are provided on the inner side of the fixed mold turntable. The two fixed mold ejection mechanisms and the two fixed mold cavities exchange positions synchronously. Each fixed mold ejection mechanism is provided with an inclined ejector, which is in sliding cooperation with the fixed mold, and one end of the inclined ejector is movably connected to the fixed mold ejection mechanism; The fixed mold ejection mechanism includes an ejector plate and a fixed mold ejector rod arranged on the ejector plate. One end of the fixed mold ejector rod is fixedly connected to the ejector plate, and the other end extends into the fixed mold turntable and slides with it. The ejector plate is fixed with a slide rail, the slide rail is provided with a second slider which is slidably matched with the second slider, and one end of the inclined ejector is hinged to the second slider; Two first nylon locking buckles are symmetrically fixed on one side of the fixed mold turntable close to the movable mold. The movable mold is provided with a locking sleeve corresponding to the two first nylon locking buckles. After the movable mold and the fixed mold are closed, each first nylon locking buckle is located in the corresponding locking sleeve. When the mold is opened, the friction resistance of the locking sleeve to the first nylon locking buckle pulls the fixed mold turntable outward by 5mm, so that the fixed mold turntable and the fixed mold are separated by a certain gap, thereby avoiding the friction resistance of the fixed mold when the fixed mold turntable rotates.

2. The injection mold with interchangeable cavities and single-side demoulding according to claim 1, characterized in that: The movable mold and the fixed mold are adjacent to each other on one side, and have two movable mold cores with different structures. Any fixed mold cavity can be matched with the two movable mold cores. Any fixed mold cavity can cooperate with one of the dynamic mold cores to form an injection cavity for the intermediate product. After the mold is opened, the intermediate product remains on the fixed mold turntable. After the fixed mold turntable rotates 180°, the fixed mold cavity with the intermediate product cooperates with another dynamic mold core to form the injection cavity for the final product.

3. The injection mold with interchangeable cavities and single-side demoulding according to claim 1, characterized in that: The fixed mold turntable driving device includes a gear rack mechanism, a first rotating shaft and a first oil cylinder. The first rotating shaft cooperates with the fixed mold through a ball bearing, and one end of the first rotating shaft is fixedly connected to the fixed mold turntable. The first oil cylinder is fixedly mounted on the fixed mold, and the piston rod of the first oil cylinder drives the first rotating shaft to rotate through a gear rack mechanism, and the first rotating shaft drives the fixed mold turntable to rotate around its axis.

4. The injection mold with interchangeable cavities and single-side demoulding according to claim 3, characterized in that: The rack and pinion mechanism includes a gear and a rack, wherein the gear is fixedly sleeved on the first rotating shaft, the rack is linearly slidably engaged with the fixed die via the first slider, and the piston rod of the first oil cylinder is connected to the first slider; Two travel switches are provided on one side of the first oil cylinder, and the two travel switches are installed on the fixed mold with relative intervals. The first slider is provided with a signal rod, one end of the signal rod is fixedly connected to the first slider, and the other end is located between the two travel switches.

5. The injection mold with interchangeable cavities and single-side demoulding according to claim 1, characterized in that: The fixed mold is provided with a turntable positioning mechanism, which includes a limit block and two stoppers. The two stoppers are fixed on opposite sides of the fixed mold turntable and rotate with the fixed mold turntable. The limit blocks are located on the outside of the fixed mold turntable and are fixedly connected to the fixed mold. The limit blocks cooperate with the stop blocks to position the rotation angle of the fixed mold turntable.

6. The injection mold with interchangeable cavities and single-side demoulding according to claim 1, characterized in that: Each ejector plate is symmetrically provided with two return rods, one end of each return rod is fixedly connected to the ejector plate, and the other end passes through the fixed mold turntable and is provided with a second nylon mold locking buckle; The movable mold is provided with two locking sleeves that cooperate with the second nylon locking buckles at the ends of the two return rods at the position of forming the final product. The second nylon locking buckles at the ends of the two return rods at the position of forming the final product are avoided on the movable mold side.

7. The injection mold with interchangeable cavities and single-side demoulding according to claim 1, characterized in that: The fixed mold is provided with a turntable installation cavity matched with the fixed mold turntable, and the outer side wall of the fixed mold turntable and the inner side wall of the turntable installation cavity are both tapered surfaces.

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