Mold opening and closing sequence auxiliary mechanism, double-color injection mold and double-color injection method

Abstract

The embodiment of the invention relates to a mold opening and closing sequence auxiliary mechanism, a double-shot injection mold and a double-shot injection method, and the mold opening and closing sequence auxiliary mechanism provided by the embodiment of the invention effectively solves the problem of disordered mold closing sequence caused by thermal expansion of a shutter. The mold opening and closing sequence auxiliary mechanism provided by the embodiment of the invention comprises a driving part arranged on a plate B; the fixed base is arranged on the plate A; the sliding block is arranged in the fixed base in a sliding manner; the limiting piece is fixed on the water gap plate; during mold closing, the sliding block stops the limiting piece from descending so as to prevent the stripper plate and the A plate from being closed; and when the plate B and the plate A are closed in place, the driving part pushes the sliding block to slide to relieve blocking to the limiting piece, and the stripper plate and the plate A are closed.

Description

Technical Field

[0001] This application relates to the field of mold injection technology, and in particular to an auxiliary mechanism for mold opening and closing sequence, a two-color injection mold, and a two-color injection method. Background Technology

[0002] In the two-color injection molding production of automotive parts, a two-color three-plate mold structure is commonly used. The standard workflow is as follows: the first injection completes the molding of the hard plastic product in the first color cavity. After the mold is opened, the injection molding machine table rotates 180° to move the molded first injection product to the position of the second color cavity. The mold is closed for the second time, and the second injection unit injects the second material into the cavity to combine with the first injection product.

[0003] In existing technology, due to defects in the mold structure, the mold temperature rises during the second color mold closing process, causing the opening and closing device to expand due to heat. This leads to interference between the opening and closing device and the opening and closing device hole on plate A, directly causing the mold closing sequence to be reversed. The normal mold closing sequence should be to close plates A and B first to align the core with the cavity, and then close the sprue plate for casting. However, the interference forces the sprue plate to close before plate A. During the process of the sprue plate closing first, the front mold slider base installed on it will drive the slider prematurely. At this time, the first color product and the rear mold core are not yet fully aligned, causing the slider to violently impact the product, resulting in crushing damage to the product and damage to the mold slider, a mold-pressing accident. This problem has persisted for a long time, leading to frequent mold repairs, extended downtime, and persistently high production costs. Summary of the Invention

[0004] In view of this, the present application provides an auxiliary mechanism for mold opening and closing sequence, a two-color injection mold, and a two-color injection method to solve at least one problem existing in the background art, effectively solving the problem of disordered mold closing sequence caused by thermal expansion of the opening and closing device.

[0005] In a first aspect, embodiments of this application provide an auxiliary mechanism for mold opening and closing sequence, including: The drive component is mounted on board B. Fixed base, mounted on plate A; A sliding block is slidably disposed within a fixed base; The limiting component is fixed to the sprue plate; During mold closing, the sliding block blocks the limiting component from moving downwards to prevent the sprue plate from closing with plate A; when plate B and plate A are in the mold closing position, the drive component pushes the sliding block to slide and release the blocking component, and the sprue plate closes with plate A.

[0006] In conjunction with the first aspect of this application, in an optional embodiment, the driving component is a shovel base with an inclined surface, and the sliding block is provided with a guide portion that engages with the inclined surface.

[0007] In conjunction with the first aspect of this application, in an optional embodiment, a first groove is provided on the fixed base, and a second groove is provided on the sliding block; When the sliding block is pushed to release the obstruction, the first groove aligns with the second groove to form a guide groove into which the limiting member slides. Both the first groove and the second groove are through grooves in the vertical direction.

[0008] In conjunction with the first aspect of this application, in an alternative embodiment, The mold opening sequence auxiliary mechanism also includes an elastic element disposed between the sliding block and the fixed base for resetting the sliding block.

[0009] In conjunction with the first aspect of this application, in an optional embodiment, the elastic element is a spring, disposed within a receiving groove formed on the sliding block.

[0010] In conjunction with the first aspect of this application, in an optional embodiment, the driving component is provided with a hook portion, and the sliding block is provided with a recess portion that mates with the hook portion; When the mold is opened, the hook and the recess form an undercut fit to pull plate A backward.

[0011] In conjunction with the first aspect of this application, in an optional embodiment, the opening / closing hole on plate A is a clearance hole, the diameter of which is larger than the diameter of the opening / closing device.

[0012] Secondly, embodiments of this application provide a two-color injection mold, including a first-color mold and a second-color mold, wherein the second-color mold is provided with an opening and closing sequence auxiliary mechanism as described in the first aspect embodiment above.

[0013] Thirdly, embodiments of this application provide a two-color injection molding method, using a two-color injection mold as described in the second aspect embodiment above. The mold closing process of the second color mold includes the following steps: S1. The moving mold part pushes plate B to move towards plate A. The opening and closing hole on plate A is a clearance structure. Plate B and plate A close the mold first. During this process, the sliding block blocks the limiting component connected to the sprue plate, and the sprue plate is suspended. S2. When plate B and plate A are in the mold closing position, the drive component fixed on plate B pushes the sliding block to slide, releasing the obstruction of the limiting component. As the sprue plate moves downward, the limiting component is embedded in the guide groove of the sliding block, and the sprue plate and plate A are closed, allowing the mold to perform the second color injection.

[0014] In conjunction with a third aspect of this application, in an optional embodiment, the mold-opening process for the second color mold includes the following steps: S3. The moving mold part drives plate B to move backward, and through the drive component and sliding block that form an undercut fit, it pulls plate A and sprue plate together to separate from plate B. S4. The sprue plate spring is released, pushing open the sprue plate to achieve mold opening.

[0015] The mold opening and closing sequence auxiliary mechanism provided in this application, through the coordinated operation of the driving component, fixed base, sliding block, and limiting component, ensures that during mold closing, the sliding block extends to block the downward movement of the limiting component fixed to the sprue plate, forcing the sprue plate to hover. This allows plate B and plate A to close first. Once plates A and B are in the correct mold closing sequence, the driving component fixed to plate B pushes the sliding block to release the obstruction of the limiting component, allowing the sprue plate to descend and complete the closure. Thus, through the coordinated action of each component, the correct mold closing sequence of closing plates A and B before closing the sprue plate is ensured, preventing the slider from impacting the product and causing mold compression accidents, thereby guaranteeing the stability and reliability of mold production.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram illustrating the application of the mold opening and closing sequence auxiliary mechanism according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the mold opening and closing sequence auxiliary mechanism according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the mold opening and closing sequence auxiliary mechanism according to an embodiment of this application; Figure 4 A schematic diagram of the opening and closing mold sequence auxiliary mechanism according to an embodiment of this application; Figure 5 for Figure 1 A partial structural diagram; Figure 6 for Figure 1 A cross-sectional schematic diagram.

[0018] Figure label: 1. Install the upper fixing plate; 2. Nozzle plate; 3. Board A; 4. Board B; 5. Sprue leaf spring; 6. Opening and closing device; 7. Drive component; 71. Hook; 8. Limiting components; 9. Fixed base; 91. First groove; 92. Flat groove; 10. Sliding block; 101. Second groove; 102. Recess; 11. Elastic elements; 12. Tie rod mechanism; 13. Guide groove; 14. Opener / closer hole. Detailed Implementation

[0019] To make the technical solution and beneficial effects of the present invention more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0020] In the description of this invention, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this invention and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limiting this invention.

[0021] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0022] In this invention, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this invention, unless otherwise explicitly defined, the terms "above," "on top of," "over," "above," "below," "below," "below," or "below" for "first feature above second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "over," and "below" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0024] The opening and closing mold sequence auxiliary mechanism of this application embodiment will be described in detail below with reference to the accompanying drawings.

[0025] like Figures 1 to 6 As shown, the mold opening and closing sequence auxiliary mechanism according to the first aspect of this application, for the second color mold of a two-color three-plate mold, may include: a driving component 7, a fixed base 9, a sliding block 10, and a limiting component 8.

[0026] The drive component 7 is mounted on plate B 4. A fixed base 9 is mounted on plate A 3. A sliding block 10 is slidably mounted within the fixed base 9. The fixed base 9 provides guidance and support for the sliding block 10. A limiting member 8 is fixed to the sprue plate 2. The drive component 7 and the fixed base 9 correspond to each other, located on the right side of plate B 4 and the right side of plate A 3, respectively.

[0027] When the mold is closed, the sliding block 10 slides down to block the limiting member 8 to prevent the sprue plate 2 from closing with plate A 3. When plate B 4 and plate A 3 are in the mold closing position, the drive component 7 pushes the sliding block 10 to slide and release the blocking member 8, and the sprue plate 2 and plate A 3 close.

[0028] The mold opening and closing sequence auxiliary mechanism provided in the embodiments of this application, such as Figures 1 to 6 As shown, through the coordinated action of the driving component 7, the fixed base 9, the sliding block 10, and the limiting component 8, during mold closing, the sliding block 10 extends, blocking the downward movement of the limiting component 8 fixed to the sprue plate 2, forcing the sprue plate 2 to hover. Thus, plate B 4 and plate A 3 close the mold first. After plates A and B are closed, the driving component 7 fixed to plate B 4 pushes the sliding block 10 to slide, releasing the obstruction of the limiting component 8, and the sprue plate 2 then moves downward to complete the closure. Therefore, through the coordinated action of each component, the correct mold closing sequence of closing plates A and B before closing the sprue plate is ensured, avoiding slider impact on the product and mold pressing accidents, thus guaranteeing the stability and reliability of mold production.

[0029] To clarify further, plate A3, also known as the fixed platen, typically refers to the fixed side platen, which is connected to the fixed part of the injection molding machine and often contains the cavity. Plate B4, also known as the moving platen, typically refers to the movable side platen, which is connected to the movable part of the injection molding machine and often contains the core.

[0030] In conjunction with the first aspect of this application, in an alternative embodiment, such as Figures 2 to 4 As shown, the driving component 7 is a shovel base with an inclined surface, and the sliding block 10 is provided with a guide part that cooperates with the inclined surface.

[0031] Specifically, such as Figures 2 to 4 As shown, during mold closing, the injection molding machine pushes plate B4 towards plate A3. The inclined shovel base fixed to plate B4 moves accordingly, its inclined surface contacting the guide portion of sliding block 10, converting the vertical mold closing force into a horizontal component force, pushing sliding block 10 to slide laterally to the right on the fixed base 9. The fixed base 9 has a flat groove 92 that mates with the guide portion; the width of the flat groove 92 is greater than the width of the guide portion, and it communicates with the guide portion.

[0032] like Figures 2 to 4 As shown, when plate B4 and plate A3 are fully closed in place, sliding block 10 slides to the rightmost end, releasing its obstruction of sprue plate 2. Sprue plate 2 then moves downward, and sprue plate 2 and plate A3 complete the closure.

[0033] Similarly, during mold opening, plate B4 drives the shovel base to retract, and the inclined surface of the shovel base disengages from the guide portion. At this time, with the cooperation of other reset mechanisms (such as elastic element 11), the sliding block 10 returns to the initial position of the downward movement of the blocking limit member 8, preparing for the next mold closing. The structure is simple and easy to process and maintain.

[0034] In conjunction with the first aspect of this application, such as Figures 2 to 4 As shown, in an optional embodiment, the fixed base 9 has a first groove 91, and the sliding block 10 has a second groove 101. When the sliding block 10 is pushed to release the obstruction, the first groove 91 and the second groove 101 align to form a guide groove 13 into which the limiting member 8 slides. Both the first groove 91 and the second groove 101 are through grooves in the vertical direction.

[0035] In the initial mold closing phase, the sliding block 10 is in its initial position, with its second groove 101 misaligned with the first groove 91 on the fixed base 9. The sliding block 10 blocks the downward movement of the limiting member 8. When the B plate 4 and A plate 3 are in the mold closing position, the driving component 7 pushes the sliding block 10 to slide laterally. When the sliding block 10 moves to a specific position... Figure 3 As shown at the far right, the first groove 91 and the second groove 101 align to form a guide groove 13 into which the limiting member 8 slides. Both the first groove 91 and the second groove 101 are through grooves in the vertical direction, which facilitates observation of the alignment between the limiting member 8 and the guide groove 13, and makes debugging and maintenance convenient.

[0036] After the mold is opened, the sliding block 10 is reset, and the first groove 91 and the second groove 101 are misaligned again, blocking the downward movement of the limiting piece 8.

[0037] In conjunction with the first aspect of this application, such as Figures 2 to 4 As shown, in an optional embodiment, the mold opening and closing sequence auxiliary mechanism further includes an elastic element 11 disposed between the sliding block 10 and the fixed base 9, for resetting the sliding block 10. When the driving component 7 pushes the sliding block 10 to release the obstruction, the sliding block 10 compresses the elastic element 11. When the mold opens, the elastic element 11 is released, pushing the sliding block 10 back to the initial obstruction position.

[0038] In conjunction with the first aspect of this application, such as Figures 2 to 4 As shown, in an optional embodiment, the elastic element 11 can be a spring, which is not limited in this application; it can also be a torsion spring, an air cushion, etc. The spring is disposed in a receiving groove (not shown) opened on the sliding block 10. This facilitates the reset of the sliding block 10 and is beneficial for assembly and maintenance, significantly reducing manufacturing and maintenance costs.

[0039] In conjunction with the first aspect of this application, such as Figures 2 to 4 As shown, in an optional embodiment, the driving component 7 is provided with a hook 71, and the sliding block 10 is provided with a recess 102 that cooperates with the hook 71. When the mold is opened, the hook 71 and the recess 102 form an overlock engagement to pull the A plate 3 backward.

[0040] In conjunction with the first aspect of this application, in an alternative embodiment, such as Figure 5 As shown, the opening 14 on plate A3 is a clearance hole, and its diameter is larger than that of the opening 6.

[0041] Specifically, during mold closing, since the opening and closing hole 14 on plate A 3 is designed as a clearance hole, the opening and closing device 6 does not interfere with plate A 3 during mold closing, and plate B 4 can smoothly push plate A 3 to achieve the first mold closing of plates A and B.

[0042] When the mold opens, the moving mold part drives the B plate 4 to move backward. Since the opening and closing hole 14 is not clear, it cannot provide the opening pulling force. At this time, the hook 71 of the driving part 7 and the pre-formed undercut of the recess 102 of the sliding block 10 play a role. Through mechanical interlocking, the A plate 3 and the sprue plate 2 connected to it are pulled backward synchronously to realize the mold opening.

[0043] like Figures 1 to 6 As shown, the working process of the mold opening and closing sequence auxiliary mechanism in this application embodiment is specifically divided into two stages: mold closing and mold opening. When the second color mold is closed, the moving mold part of the injection molding machine pushes plate B4 towards plate A3. Since the opening and closing hole 14 on plate A3 is set as a clearance structure, the opening and closing device 6 does not interfere, and plate B4 and plate A3 begin to close first. During this mold closing process, the sliding block 10 extends to the left, blocking the downward movement of the limiting piece 8 fixed on the sprue plate 2, keeping it in a suspended state.

[0044] When plate B4 and plate A3 are fully closed, the drive component 7 fixed on plate B4 contacts and pushes the sliding block 10 to the right, compressing the elastic element 11. The displacement of the sliding block 10 causes the second groove 101 on it to align with the first groove 91 on the fixed base 9, forming a complete guide groove 13. As the sprue plate 2 moves downward, the limiting component 8 slides into the guide groove 13, and the sprue plate 2 and plate A3 are closed. The mold then proceeds with the second color injection molding.

[0045] During mold opening, the moving mold part of the injection molding machine drives plate B 4 backward. The hook 71 on the drive component 7 fixed to plate B 4 forms an undercut engagement with the recess 102 on the sliding block 10. Through the mechanical interlocking structure of the undercut engagement, the drive component 7 forcibly pulls plate A 3 and the sprue plate 2 connected to it together to separate from plate B 4, without the need for the opening / closing device 6. Subsequently, the sprue plate spring 5 is released, pushing the sprue plate 2 open, realizing mold opening. After the sprue plate 2 is pushed open, the compressed elastic element 11 recovers its deformation, pushing the sliding block 10 back to its initial extended position, preparing for the next mold closing.

[0046] Therefore, the mold opening and closing sequence auxiliary mechanism of this application effectively solves the problem of disordered mold closing sequence caused by thermal expansion of the traditional opener / closer 6, avoiding the resulting slide block impact on the product and mold pressing accidents. It not only achieves precise and reliable control of the mold closing sequence, significantly improving the stability of mold operation and production yield, but also can be achieved through simple technical modifications without the need for mold reopening, effectively extending the mold's service life and saving a significant amount of production costs.

[0047] Secondly, embodiments of this application provide a two-color injection mold, including a first-color mold and a second-color mold, such as... Figure 1 As shown, the second-color mold is provided with an opening and closing sequence auxiliary mechanism as described in the first aspect embodiment above. Figure 5 The two-color injection mold shown also includes a conventional tie rod mechanism 12. The sprue plate 2 is connected to the upper fixed plate 1 via the tie rod mechanism 12. The tie rod mechanism 12 is used to control the mold opening sequence between the sprue plate 2 and plate A 3. The mold opening and closing sequence auxiliary mechanism of the present invention works in conjunction with the tie rod mechanism 12, which is prior art and will not be described in detail here.

[0048] Thirdly, embodiments of this application provide a two-color injection molding method, using a two-color injection mold as described in the second aspect of the above embodiment, such as... Figures 1 to 6As shown, the mold closing process for the second color mold includes the following steps: S1. The moving mold part pushes the B plate 4 to move towards the A plate 3. The opening and closing hole 14 on the A plate 3 is a clearance structure. The B plate 4 and the A plate 3 close the mold first. During this process, the sliding block 10 blocks the limiting piece 8 connected to the sprue plate 2, and the sprue plate 2 is suspended. S2. When the B plate 4 and the A plate 3 are in the mold closing position, the drive component 7 fixed on the B plate 4 pushes the sliding block 10 to slide, releasing the obstruction of the limiting component 8. As the sprue plate 2 moves downward, the limiting component 8 is embedded in the guide groove 13 of the sliding block 10, and the sprue plate 2 and the A plate 3 are closed, and the mold is then used for the second color injection molding.

[0049] In conjunction with a third aspect of this application, in an optional embodiment, the mold-opening process for the second color mold includes the following steps: S3. The moving mold part drives the B plate 4 to move backward. Through the drive component 7 and the sliding block 10 that form an undercut fit, the A plate 3 and the sprue plate 2 are pulled to separate from the B plate 4. S4, the sprue plate spring 5 is released, pushing open the sprue plate 2, realizing mold opening.

[0050] It should be noted that during the mold opening process, the moving mold part drives plate B4 to move backward. At this time, through the undercut engagement formed by the drive component 7 and the sliding block 10, this mechanism directly acts on plate A3 and pulls it backward. Since the sprue plate 2 and plate A3 are in a linked state at the initial stage of mold opening, when plate A3 is pulled, the sprue plate 2 moves synchronously, thereby realizing the separation of plate A3 and sprue plate 2 from plate B4 together.

[0051] Therefore, the two-color injection molding method provided in this application embodiment uses the mold opening and closing sequence auxiliary mechanism of the first aspect embodiment. Through the coordinated action of the driving component 7, the sliding block 10 and the limiting component 8, the correct mold closing sequence of closing the AB plate first and then the sprue plate is ensured, avoiding the slider hitting the product and mold pressing accidents, and ensuring the stability and reliability of mold production.

[0052] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. An open-close sequence assisting mechanism characterized by comprising: The utility model relates to a kind of open-close sequence auxiliary mechanism of mould, including: Driving component (7) is arranged on B plate (4); Fixed pedestal (9) is arranged on A plate (3); Sliding block (10) is slidably arranged in the fixed pedestal (9); Limiting piece (8) is fixed on water gap plate (2); Wherein, when the mould is closed, the sliding block (10) blocks the limiting piece (8) from descending, to prevent the water gap plate (2) from closing with the A plate (3); When the B plate (4) and the A plate (3) are closed to position, the driving component (7) pushes the sliding block (10) to slide and remove the block to the limiting piece (8), and the water gap plate (2) is closed with the A plate (3).

2. The open-close sequence auxiliary mechanism of mould according to claim 1, wherein: The driving component (7) is a shovel base with an inclined surface, and the sliding block (10) is provided with a guide portion matched with the inclined surface.

3. The open-close sequence auxiliary mechanism of mould according to claim 1, wherein: A first groove (91) is formed on the fixed pedestal (9), and a second groove (101) is formed on the sliding block (10); When the sliding block (10) is pushed to remove the block, the first groove (91) and the second groove (101) are butted to form a guide groove (13) for the limiting piece (8) to slide into; The first groove (91) and the second groove (101) are both through grooves in the vertical direction.

4. The opening and closing sequence assisting mechanism according to claim 3, characterized by Further comprising: An elastic element (11) is arranged between the sliding block (10) and the fixed pedestal (9) to reset the sliding block (10).

5. The open-close sequence auxiliary mechanism of mould according to claim 1, wherein: The elastic element (11) is a spring arranged in a receiving groove formed on the sliding block (10).

6. The open-close sequence auxiliary mechanism of mould according to claim 2, wherein: The driving component (7) is provided with a hook portion (71), and the sliding block (10) is provided with a recess portion (102) matched with the hook portion (71); When the mould is opened, the hook portion (71) and the recess portion (102) form a reverse buckling cooperation to pull back the A plate (3).

7. The opening and closing sequence assist mechanism according to Claim 1, characterized by The shutter hole (14) formed on the A plate (3) is an empty hole with a diameter larger than that of the shutter (6).

8. A two-color injection mold comprising a first color mold and a second color mold, characterized in that, The second color mold is provided with the open-close sequence auxiliary mechanism of mould according to any one of claims 1-7.

9. A two-color injection molding method using the two-color injection mold according to claim 8, characterized by, The closing process of the second color mold includes the following steps: S1, the movable die part pushes the B plate (4) to move towards the A plate (3), and the shutter hole (14) on the A plate (3) is an empty structure, and the B plate (4) and the A plate (3) are closed first; In this process, the sliding block (10) blocks the limiting piece (8) connected with the water gap plate (2), and the water gap plate (2) hovers; S2, when the B plate (4) and the A plate (3) are closed to position, the driving component (7) fixed on the B plate (4) pushes the sliding block (10) to slide, and removes the block to the limiting piece (8). The water gap plate (2) goes down, the limiting part (8) slides into the guide groove (13) of the sliding block (10), the water gap plate (2) and the A plate (3) complete closure, and the mold is second color injection molding.

10. The two-color injection molding method according to claim 8, characterized by The mold opening process of the second color mold comprises the following steps: S3, the movable mold part drives the B plate (4) to retreat, and through the driving part (7) and the sliding block (10) forming reverse locking, the A plate (3) and the water gap plate (2) are pulled to separate from the B plate (4); S4, the water gap plate spring (5) is released, the water gap plate (2) is opened, and the mold is opened.

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