Double-color injection mold

Abstract

The invention discloses a double-shot injection mold which comprises a fixed mold provided with a first fixed mold core used for forming a first-shot product and a second fixed mold core used for forming a second-shot product; two same movable mold cores are arranged on the movable mold, and a plurality of pressing mechanisms used for fixing a first injection product are arranged on the outer side of a movable mold cavity located on the movable mold cores; the pressing mechanism comprises a pressing block in sliding fit with the movable mold core, and the pressing block can horizontally move in the direction away from or close to the movable mold cavity. When the fixed mold and the movable mold are closed, the pressing block on the movable mold core which is closed with the first fixed mold core can be pushed to move towards the direction close to the movable mold cavity, and the pressing block on the movable mold core which is closed with the second fixed mold core can be pushed to move towards the direction away from the movable mold cavity. The first-shot product is fixed in the movable mold cavity through the pressing mechanism when the mold is opened, so that the problem that the first-shot product is displaced due to adhesion between the first-shot product and the fixed mold is well solved.

Description

Technical Field

[0001] The invention belongs to the technical field of double-color injection molding, and in particular relates to a double-color injection molding mold. Background Art

[0002] Two-shot injection molding is a process of injection molding on an injection molding machine by rotating and translating the core and closing the mold with different cavities. The molding machine injects plastics of the same material but different colors or different materials to form a two-shot product. During two-shot injection molding, generally, a first shot product is molded first, then the mold is opened and re-closed to mold a second shot product. When opening the mold, the first shot product needs to be left in the cavity of the moving mold for the second shot molding operation. When opening the mold, since the first shot product may adhere to the fixed mold, it is easy for the first shot product to escape from the moving mold cavity or shift and move, affecting the injection molding quality of the two-shot product. Summary of the invention

[0003] The purpose of the present invention is to provide a two-color injection mold to solve the problem that when the two-color injection mold is opened after the one-shot product is formed, the one-shot product is easily released from or shifted from the dynamic mold cavity.

[0004] The present invention is achieved through the following technical solutions: Two-color injection mold, including: A fixed mold, wherein the fixed mold is provided with a first fixed mold core for molding a first-shot product and a second fixed mold core for molding a second-shot product; A movable mold, wherein two identical movable mold cores are arranged on the movable mold, and a plurality of clamping mechanisms for fixing a shot product are arranged outside the movable mold cavity of the movable mold core; The clamping mechanism comprises a clamping block which is slidably matched with the movable mold core, and the clamping block can move horizontally in a direction away from or close to the movable mold cavity; When the fixed mold and the movable mold are closed, the clamping block on the movable mold core closed with the first fixed mold core can be pushed toward the direction close to the movable mold cavity, and the clamping block on the movable mold core closed with the second fixed mold core can be pushed toward the direction away from the movable mold cavity.

[0005] In some embodiments, the pressing block is provided with a first driving part and a second driving part; The fixed mold is provided with a third driving part cooperating with the first driving part at a position corresponding to the first fixed mold core. When the fixed mold and the movable mold are closed, the third driving part cooperates with the first driving part to drive the pressing block on the corresponding movable mold core to move toward the direction close to the movable mold cavity. The second fixed mold core is provided with a fourth driving part cooperating with the second driving part. When the fixed mold and the movable mold are closed, the fourth driving part cooperates with the second driving part to drive the clamping block on the corresponding movable mold core to move in a direction away from the movable mold cavity.

[0006] In some embodiments, the clamping block includes a sliding portion for slidingly cooperating with the movable mold core, a cantilever structure extending toward the movable mold cavity and arranged on the clamping portion, and a driving portion arranged on the sliding portion and protruding toward the fixed mold; The first driving part and the second driving part are a first driving surface and a second driving surface arranged opposite to each other on the driving part, and the first driving surface and the second driving surface are inclined surfaces inclined in opposite directions; The fixed mold is provided with a first recessed portion for the driving portion to extend into, and the third driving portion is a third driving surface located on the first recessed portion, and the third driving surface cooperates with the first driving surface; The second fixed mold core is provided with a second recessed portion for the driving portion to extend into, the fourth driving portion is a fourth driving surface located on the second recessed portion, and the fourth driving surface cooperates with the second driving surface; A third recessed portion for the driving part to extend into is arranged on the fixed mold at the position where the second fixed mold core is located, and the third recessed portion provides a space for the driving part to move in a direction away from the movable mold cavity.

[0007] In some embodiments, a limiting mechanism is also included, which is used to limit the sliding of the clamping block on the movable mold core, and when the clamping block slides under the action of an external force, the limiting mechanism can release the restriction on the clamping block under the action of the force exerted by the clamping block.

[0008] In some embodiments, the limiting mechanism includes a first limiting member and an elastic reset member, the first limiting member is slidably matched with the movable mold core, so that the first limiting member can move in the vertical direction, and the elastic reset member is used to provide the first limiting member with a force to move toward the pressing block; The first limiting member is provided with a first limiting portion, and the pressing block is provided with a second limiting portion cooperating with the first limiting portion. The cooperation between the first limiting portion and the second limiting portion can limit the pressing block at a position for fixing a shot product and a position for releasing the fixation of the shot product.

[0009] In some embodiments, the first limiting portion is a protrusion arranged on the first limiting member, and the second limiting portion is two grooves arranged on the bottom surface of the clamping block. When the protrusion extends into the groove, the clamping block can be limited, and when the clamping block is subjected to a force in a sliding direction, the protrusion can fall out of the groove.

[0010] In some embodiments, along the sliding direction, the protrusion and the groove are provided with opposing wedge-shaped surfaces.

[0011] In some embodiments, the limiting mechanism includes a limiting plate arranged on the movable mold core, a limiting hole is arranged on the limiting plate, the first limiting member is cooperatively arranged in the limiting hole, and the elastic reset member is a screw fixedly arranged on the first limiting member, and the other end of the screw abuts against the movable mold.

[0012] Compared with the prior art, the present invention has the following advantages and beneficial effects: In the two-color injection mold of the present invention, a clamping mechanism for fixing a first-shot product is arranged on the movable mold core. The first-shot product is fixed in the movable mold cavity by the clamping mechanism when the mold is opened, which effectively solves the problem of displacement of the first-shot product due to adhesion between the first-shot product and the fixed mold.

[0013] By coordinating the clamping mechanism with other parts of the mold, when closing the mold, the clamping block on the movable mold core that cooperates with the first fixed mold core can be pushed to the position to fix the first-shot product, thereby clamping and fixing the first-shot product; at the same time, the clamping block on the movable mold core that cooperates with the second fixed mold core can be pushed to the position to release the clamping and fixing of the first-shot product, so as to avoid the influence of the clamping block on the molding of the second-shot product and enable the two-color product after the second-shot molding to be lifted up when the mold is opened.

[0014] Through the setting of the limiting mechanism and the action principle of the clamping mechanism, the position of the clamping block at two different workstations can be effectively limited to ensure the stability of the position of the clamping block. At the same time, through the design of the limiting mechanism structure, while the clamping block is limited, when it is necessary to drive the clamping block to move, the mutual cooperation between the components can be used to release the limit on the clamping block. The structural design is ingenious and the action reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic structural diagram of a two-color injection mold in a mold closing state according to an embodiment of the present invention.

[0017] Figure 2 It is a cross-sectional schematic diagram of a two-color injection mold in a mold closing state according to an embodiment of the present invention.

[0018] Figure 3 It is a structural schematic diagram of the mold closing state of the first fixed mold core and the movable mold core in the double-color injection mold according to an embodiment of the present invention.

[0019] Figure 4The figure is a schematic diagram of the clamping mechanism on the movable mold core of the two-color injection mold according to an embodiment of the present invention.

[0020] Figure 5 It is a cross-sectional schematic diagram of a two-color injection mold at the first fixed mold core position according to an embodiment of the present invention.

[0021] Figure 6 for Figure 5 Partial schematic diagram at point A in the middle.

[0022] Figure 7 It is a cross-sectional schematic diagram of a two-color injection mold at the second fixed mold core position according to an embodiment of the present invention.

[0023] Figure 8 for Figure 7 Partial schematic diagram at point B in the middle.

[0024] Fig. 9 Schematic diagram of the structure of the clamping mechanism in an embodiment of the present invention.

[0025] Fig.10 It is a schematic diagram of the cooperation structure between the first limit member and the pressing block in the pressing mechanism according to an embodiment of the present invention.

[0026] Fig.11 It is a schematic diagram of the structure of the limiting mechanism in the clamping mechanism of an embodiment of the present invention.

[0027] in: 10. fixed mold, 101. first recessed portion, 102. third driving surface, 103. third recessed portion, 11. first fixed mold core, 12. second fixed mold core, 121. second recessed portion, 122. fourth driving surface; 20, movable mold, 21, movable mold core, 211, movable mold cavity; 30. Clamping mechanism, 31. Clamping block, 311. Driving portion, 3111. First driving surface, 3112. Second driving surface, 312. Sliding portion, 313. Clamping portion, 314. Groove, 32. Limiting slide rail, 33. First limiting member, 331. Protrusion, 34. Elastic reset member, 35. Limiting plate; 41. One-shot product, 42. Two-shot product. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0029] In view of the problem that during two-color injection molding, when the mold is opened for one-shot molding, the first-shot product may stick to the fixed mold, causing the first-shot product to shift, the present invention provides a two-color injection mold, in which a clamping mechanism for fixing the first-shot product is provided on the movable mold core, and the first-shot product is fixed in the movable mold cavity by the clamping mechanism when the mold is opened, thereby avoiding the problem of the first-shot product shifting due to adhesion between the first-shot product and the fixed mold.

[0030] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments of the present invention, the two-color injection mold comprises: A fixed mold 10, on which a first fixed mold core 11 for molding a first shot product 41 and a second fixed mold core 12 for molding a second shot product 42 are disposed; The movable mold 20 is provided with two identical movable mold cores 21, and a plurality of clamping mechanisms 30 for fixing a shot product are arranged outside a movable mold cavity 211 of the movable mold core 21; the clamping mechanisms are arranged around the movable mold cavity to fix the shot product at multiple points at various positions; The clamping mechanism 30 includes a clamping block 31 that is slidably matched with the movable mold core, and the clamping block 31 can move horizontally in a direction away from or close to the movable mold cavity; When the fixed mold and the movable mold are closed, the clamping block on the movable mold core closed with the first fixed mold core can be pushed toward the direction close to the movable mold cavity, and the clamping block on the movable mold core closed with the second fixed mold core can be pushed toward the direction away from the movable mold cavity.

[0031] By coordinating the clamping mechanism with other parts of the mold, when closing the mold, the clamping block on the movable mold core that cooperates with the first fixed mold core can be pushed to the position to fix the first-shot product, thereby clamping and fixing the first-shot product; at the same time, the clamping block on the movable mold core that cooperates with the second fixed mold core can be pushed to the position to release the clamping and fixing of the first-shot product, so as to avoid the influence of the clamping block on the molding of the second-shot product and enable the two-color product after the second-shot molding to be lifted up when the mold is opened.

[0032] In the structural design of the clamping mechanism, since the clamping block needs to be located at different positions during the first and second shot molding, and the clamping block is located between the movable mold and the fixed mold, there are great difficulties in designing the motion control mechanism of the clamping block.

[0033] In some embodiments, reference Figure 5 , Figure 6 , Figure 7 and Figure 8 , the pressing block 31 is provided with a first driving part and a second driving part; A third driving part cooperating with the first driving part is provided on the fixed mold 10 at a position corresponding to the first fixed mold core. When the fixed mold and the movable mold are closed, the third driving part cooperates with the first driving part to drive the pressing block on the corresponding movable mold core to move toward the direction close to the movable mold cavity. The second fixed mold core 12 is provided with a fourth driving part cooperating with the second driving part. When the fixed mold and the movable mold are closed, the fourth driving part cooperates with the second driving part to drive the clamping block on the corresponding movable mold core to move in a direction away from the movable mold cavity.

[0034] When the mold is closed, the fixed mold and the clamping block are matched to drive the clamping block to move toward the direction close to the movable mold cavity, so that the clamping block can move to a position where the first shot product can be fixed. The second fixed mold core and the clamping block are matched to drive the clamping block to move away from the movable mold cavity, so that the clamping block can move to a position where the first shot product is released.

[0035] In some embodiments, reference Fig. 9 and Fig.10 The pressing block 31 includes a sliding portion 312 for slidingly cooperating with the movable mold core, a pressing portion 313 extending in a cantilever structure toward the movable mold cavity, and a driving portion 311 protruding on the sliding portion toward the fixed mold; The first driving part and the second driving part are a first driving surface 3111 and a second driving surface 3112 arranged opposite to each other on the driving part. The first driving surface 3111 and the second driving surface 3112 are inclined surfaces inclined in opposite directions. The inclination angle of the first driving surface and the second driving surface is set to 17°. The fixed mold 10 is provided with a first recessed portion 101 for the driving part to extend into, and the third driving part is a third driving surface 102 located on the first recessed portion, and the third driving surface 102 cooperates with the first driving surface 3111; The second fixed mold core 12 is provided with a second recessed portion 121 for the driving part to extend into, and the fourth driving part is a fourth driving surface 122 located on the second recessed portion, and the fourth driving surface 122 cooperates with the second driving surface 3112; A third recessed portion 103 for the driving part to extend into is provided on the fixed mold 10 at the position where the second fixed mold core is located. The third recessed portion 103 provides a space for the driving part to move in a direction away from the movable mold cavity.

[0036] The sliding cooperation structure between the sliding part 312 and the movable mold core can be adopted by setting a limiting slide rail 32 on the movable mold core, and setting a slider that cooperates with the limiting slide rail on the sliding part, so that the clamping block can make a linear horizontal movement on the limiting slide rail, ensuring the stability and reliability of the movement of the clamping block.

[0037] The clamping portion 313 adopts a cantilever structure, and the edge of the first-shot product is clamped and fixed by its end. While clamping the first-shot product, the volume of the clamping block can be reduced, making it easier to set the clamping block on the movable mold core.

[0038] The driving part is set as a structure protruding from the movable mold core, so that the driving part can form an effective cooperation with the fixed mold and the fixed mold core, so that the cooperation structure set on the fixed mold and the fixed mold core can be effectively utilized to effectively drive the clamping block, which well solves the problem of driving the clamping block inside the mold.

[0039] By utilizing the mold closing action, the force of the clamping block is generated between the fixed mold, the fixed mold core and the clamping block, making the mold structure simpler and the action more stable and reliable. At the same time, by differentiating the structures of the fixed mold, the first fixed mold core and the second fixed mold core, the clamping blocks on the two movable mold cores can be driven to move to different positions when the mold is closed.

[0040] In some embodiments, a limiting mechanism is also included, which is used to limit the sliding of the clamping block on the movable mold core, and when the clamping block slides under the action of an external force, the limiting mechanism can release the restriction on the clamping block under the action of the force exerted by the clamping block.

[0041] By setting the limiting mechanism, the position of the pressing block at two different workstations is effectively limited to ensure the stability of the position of the pressing block.

[0042] In some embodiments, reference Fig.10 and Fig.11 The limiting mechanism includes a first limiting member 33 and an elastic reset member 34. The first limiting member 33 is slidably matched with the movable mold core so that the first limiting member can move in the vertical direction. The elastic reset member 34 is used to provide the first limiting member with a force to move toward the pressing block. The first limiting member 33 is arranged at the bottom of the pressing block, and a first limiting portion is arranged on the end surface of the first limiting member 33 opposite to the pressing block; The clamping block 31 is provided with a second limiting portion cooperating with the first limiting portion. The first limiting portion cooperates with the second limiting portion to limit the clamping block at a position for fixing a shot product and a position for releasing the fixation of a shot product.

[0043] In some embodiments, the first limiting portion is a protrusion 314 arranged on the first limiting member, and the second limiting portion is two grooves 331 arranged on the bottom surface of the clamping block. When the protrusion extends into the groove, the clamping block can be limited, and when the clamping block is subjected to a force in the sliding direction, the protrusion can fall out of the groove.

[0044] Reference Figure 6 and Fig.11Along the sliding direction, the protrusion 314 and the groove 331 are provided with relative wedge-shaped surfaces, for example, the cross-sections of the protrusion and the groove are isosceles triangles, so that when the clamping block slides under the action of external force, the first limiting member can move downward in the direction away from the clamping block under the action between the groove and the protrusion. At this time, the protrusion can withdraw from one of the grooves to release the limit on the clamping block; when the clamping block moves to another position, the protrusion moves to the position of the other groove. At this time, the first limiting member moves upward toward the position of the clamping block under the action of the elastic reset member, so that the protrusion is stuck in the groove, and the clamping block is limited at this position.

[0045] In some embodiments, the limiting mechanism includes a limiting plate 35 arranged on the movable mold core, a limiting hole is arranged on the limiting plate 35, a first limiting member 33 is cooperatively arranged in the limiting hole, and the elastic reset member 34 is a screw fixedly arranged on the first limiting member, and the other end of the screw abuts against the movable mold.

[0046] The sliding movement of the first limiting member in the vertical direction is achieved through the cooperation between the limiting plate and the first limiting member, and an elastic force in the vertical direction is provided to the first limiting member through a wave screw, so that the first limiting member can be floatingly set on the movable mold core. The structure is simple and has good movement stability.

[0047] When closing the mold, the clamping blocks on the two movable mold cores are driven by the fixed mold and the fixed mold core to move in the direction away from or close to the movable mold cavity, so that the clamping blocks on the two fixed mold cores are respectively located at the position for fixing the one-shot product and the position for contacting the fixed one-shot product, which effectively solves the problem of displacement of the one-shot product when opening the mold for two-color injection molding and ensures the molding quality of the two-color injection products.

[0048] When the first fixed mold core, the second fixed mold core and the movable mold core are molded together, a gap is formed between the end faces of the fixed mold and the movable mold, so that the movable mold core and the fixed mold core are effectively matched and the effective driving of the clamping block is guaranteed.

[0049] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship commonly placed when the product of the invention is used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0050] In addition, if the terms "horizontal" or "vertical" appear in the description of the present invention, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0051] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. Two-color injection mold, characterized in that: include: A fixed mold, wherein the fixed mold is provided with a first fixed mold core for molding a first-shot product and a second fixed mold core for molding a second-shot product; A movable mold, wherein two identical movable mold cores are arranged on the movable mold, and a plurality of clamping mechanisms for fixing a shot product are arranged outside the movable mold cavity of the movable mold core; The clamping mechanism comprises a clamping block which is slidably matched with the movable mold core, and the clamping block can move horizontally in a direction away from or close to the movable mold cavity; When the fixed mold and the movable mold are closed, the clamping block on the movable mold core closed with the first fixed mold core can be pushed toward the direction close to the movable mold cavity, and the clamping block on the movable mold core closed with the second fixed mold core can be pushed toward the direction away from the movable mold cavity.

2. The two-color injection mold according to claim 1, characterized in that: The pressing block is provided with a first driving part and a second driving part; The fixed mold is provided with a third driving part cooperating with the first driving part at a position corresponding to the first fixed mold core. When the fixed mold and the movable mold are closed, the third driving part cooperates with the first driving part to drive the pressing block on the corresponding movable mold core to move toward the direction close to the movable mold cavity. The second fixed mold core is provided with a fourth driving part cooperating with the second driving part. When the fixed mold and the movable mold are closed, the fourth driving part cooperates with the second driving part to drive the clamping block on the corresponding movable mold core to move in a direction away from the movable mold cavity.

3. The two-color injection mold according to claim 2, characterized in that: The clamping block comprises a sliding part for slidingly cooperating with the movable mold core, a cantilever structure extending toward the movable mold cavity and arranged on the clamping part, and a driving part arranged on the sliding part and protruding toward the fixed mold; The first driving part and the second driving part are a first driving surface and a second driving surface arranged opposite to each other on the driving part, and the first driving surface and the second driving surface are inclined surfaces inclined in opposite directions; The fixed mold is provided with a first recessed portion for the driving portion to extend into, and the third driving portion is a third driving surface located on the first recessed portion, and the third driving surface cooperates with the first driving surface; The second fixed mold core is provided with a second recessed portion for the driving portion to extend into, the fourth driving portion is a fourth driving surface located on the second recessed portion, and the fourth driving surface cooperates with the second driving surface; A third recessed portion for the driving part to extend into is arranged on the fixed mold at the position where the second fixed mold core is located, and the third recessed portion provides a space for the driving part to move in a direction away from the movable mold cavity.

4. The two-color injection mold according to any one of claims 1, 2 or 3, characterized in that: It also includes a limiting mechanism, which is used to limit the sliding of the clamping block on the movable mold core, and when the clamping block slides under the action of external force, the limiting mechanism can release the restriction on the clamping block under the action of the force applied by the clamping block.

5. The two-color injection mold according to claim 4, characterized in that: The limiting mechanism comprises a first limiting member and an elastic reset member, wherein the first limiting member is slidably matched with the movable mold core so that the first limiting member can move in the vertical direction, and the elastic reset member is used to provide the first limiting member with a force to move toward the pressing block; The first limiting member is provided with a first limiting portion, and the pressing block is provided with a second limiting portion cooperating with the first limiting portion. The cooperation between the first limiting portion and the second limiting portion can limit the pressing block at a position for fixing a shot product and a position for releasing the fixation of the shot product.

6. The two-color injection mold according to claim 5, characterized in that: The first limiting portion is a protrusion arranged on the first limiting member, and the second limiting portion is two grooves arranged on the bottom surface of the clamping block. When the protrusion extends into the groove, the clamping block can be limited, and when the clamping block is subjected to a force in the sliding direction, the protrusion can fall out of the groove.

7. The two-color injection mold according to claim 6, characterized in that: Along the sliding direction, the protrusion and the groove are provided with opposite wedge-shaped surfaces.

8. The two-color injection mold according to claim 5, characterized in that: The limiting mechanism includes a limiting plate arranged on the movable mold core, a limiting hole is arranged on the limiting plate, the first limiting member is cooperatively arranged in the limiting hole, the elastic reset member is a screw fixedly arranged on the first limiting member, and the other end of the screw abuts against the movable mold.

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