Double-color injection mold

Abstract

The double-color injection mold comprises a first injection mold and a second injection mold, the first injection mold comprises a first injection front mold and a first injection rear mold, the second injection mold comprises a second injection front mold and a second injection rear mold, the first injection front mold is provided with a first injection mold nozzle and a first injection front mold plate, and the second injection front mold is provided with a second injection mold nozzle and a second injection front mold plate. Each of the first injection rear mold and the second injection rear mold is provided with a rear mold plate and a base, a first injection front mold cavity is formed between the first injection front mold plate and the rear mold plate in a mold closing state, and a second injection front mold cavity is formed between the second injection front mold plate and the rear mold plate in a mold closing state; a movable plate is arranged in the base, a mold core is fixedly arranged on the front end face of the movable plate, a switching driving mechanism capable of switching the position of the movable plate is arranged at each of the four corners of the movable plate, and the first-injection rear mold and the second-injection rear mold are alternately assembled with the first-injection front mold and the second-injection front mold by synchronously rotating by 180 degrees to perform double-shot injection molding. The switching driving mechanism is arranged to achieve the purpose of controlling the position of the mold core by controlling the position of the movable plate, and the injection molding cavity is formed through switching.

Description

Technical Field

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

[0002] As disclosed in announcement numbers CN213618017U and CN113858542B, a two-color injection mold is an injection mold that uses two sets of injection molding systems to successively inject two plastics of different colors or materials into the same mold cavity to complete injection molded products of different colors or different textures. Due to the high efficiency of two-color injection molds, they are widely used.

[0003] Two-color injection molds can not only improve the aesthetics of injection molded products, but also facilitate the fitting of plastics of different materials to facilitate product assembly. Therefore, the switching reliability between the single-color cavity and the two-color cavity inside the two-color injection mold is extremely important. For example, announcement number CN213618017U discloses a two-color injection mold that achieves switching by pushing and pulling the rear template, and announcement number CN113858542B discloses a rotary switching two-color injection mold. Most conventional injection molds are formed by moving the position of the movable mold core to form a single-color injection cavity and a two-color injection cavity, respectively, so as to achieve switching between a single-color mold and a two-color mold. Now it is necessary to injection mold a cover structure. For such a circular product with a change in the outer contour diameter between the single-color cavity and the two-color cavity, it is impossible to simply use a horizontally moving switching mechanism to achieve switching. Therefore, how to achieve the injection molding of such a product is a problem that is currently in urgent need of resolution. Summary of the invention

[0004] The purpose of the invention is to overcome the shortcomings of the prior art and provide a double-color injection mold.

[0005] The purpose of the present invention is achieved through the following technical solutions: A two-shot injection mold comprises a one-shot mold and a two-shot mold arranged opposite to each other, wherein the one-shot mold comprises a matching one-shot front mold and a one-shot back mold, and the two-shot mold comprises a matching two-shot front mold and a two-shot back mold, wherein the one-shot front mold has a mold mouth and a one-shot front template, and the two-shot front mold has a two-shot mold mouth and a two-shot front template, and the one-shot back mold and the two-shot back mold have the same structure and both have a back template and a base, and a one-shot front mold cavity is formed between the one-shot front template and the back template in a mold-closing state, and the two-shot front template and the back template are connected to each other. The cam is an axially movable member which is adapted to move relative to the rear mold plate when the cam is in the mold closing state. The cam is provided with a first stepping rod, a second stepping rod and a second stepping rod respectively configured to move the cam and the second stepping rod back to move relative to the rear mold plate. The cam is provided with a first stepping rod, a second stepping rod and a second stepping rod respectively configured to move relative to the rear mold plate when the cam is in the mold closing state. The mold core and the one-shot front mold cavity form a one-shot injection cavity that can be connected to the one-shot mold nozzle; the rear end face of the two-shot front mold plate is formed with a second step surface that can drive the second connecting rod to move backward, and the second step surface limits the movable plate to the second position in the mold closing state. When the mold core is in the second position, the two-shot front mold cavity forms a two-shot injection cavity that can be connected to the two-shot mold nozzle, and the one-shot rear mold and the two-shot rear mold are alternately closed with the one-shot front mold and the two-shot front mold by synchronously rotating 180° to perform two-color injection molding.

[0006] Preferably, the mold core is in the shape of a truncated cone with a diameter gradually decreasing from the back to the front, and the rear template is provided with a through hole matching the mold core to allow the front end of the mold core to extend out.

[0007] Preferably, the rear end surface of the first-shot front template has a first pressure block facing the front end of the first connecting rod, and a first groove facing the front end of the second connecting rod, and the first pressure block and the first groove constitute the first step surface; the rear end surface of the second-shot front template has a second pressure block facing the front end of the second connecting rod, and a second groove facing the front end of the first connecting rod, and the second pressure block and the second groove constitute the second step surface.

[0008] Preferably, a supporting plate is further provided between the rear template and the base, the first connecting rod is passed through the rear template, the supporting plate and the base, a retaining ring is provided on the outer wall of the first connecting rod, a limiting groove is provided in the supporting plate, and the retaining ring is slidably provided in the limiting groove to limit the upward limit position of the first connecting rod.

[0009] Preferably, a pre-shooting module is fixedly connected to the rear end face of the pre-shooting template, a shooting fixed mold core is fixedly provided on the rear template, a receiving groove matching the shooting fixed mold core is provided in the pre-shooting module, so that the shooting fixed mold core is confined in the receiving groove when the pre-shooting module abuts against the rear template, a shooting fixed mold core has a shooting inner cavity, and a shooting plug block is slidably inserted on one side of the shooting fixed mold core, and a socket into which the front end of the mold core can be inserted is provided on the rear template, and the pre-shooting module, the shooting inner cavity and the end portions of the shooting plug block together constitute the pre-shooting mold cavity.

[0010] Preferably, a two-shot front module is fixedly connected to the rear end face of the two-shot front template, a two-shot fixed mold core is fixedly provided on the rear template, a receiving groove matching the two-shot fixed mold core is provided in the two-shot front module, so that the two-shot fixed mold core is confined in the receiving groove when the two-shot front module abuts against the rear template, the two-shot fixed mold core has a two-shot inner cavity, and a two-shot insertion block is slidably inserted on one side of the two-shot fixed mold core, and the two-shot front module, the two-shot inner cavity and the ends of the two-shot insertion block together constitute the two-shot front mold cavity.

[0011] Preferably, the front end faces of the first-shot front template and the second-shot front template are both provided with a sprue plate, and the rear end faces of the sprue plate are both fixedly provided with a first inclined guide column, the first inclined guide column having a straight section and an inclined section, the first-shot front template and the second-shot front template have straight holes matching the straight sections, the first-shot plug-in block and the second-shot plug-in block are provided with inclined holes matching the inclined sections, the first inclined guide column drives the first-shot plug-in block and the second-shot plug-in block to move by inserting or pulling out the straight holes and the inclined holes in turn, and the front end face of the rear template is provided with a first slot connected to the end of the first inclined guide column.

[0012] Preferably, locking blocks facing the sides of the first-shot fixed mold core and the second-shot fixed mold core are respectively arranged on the left and right sides of the first-shot pre-module and the second-shot pre-module, and the locking blocks are slidably arranged on the rear template, and a second inclined guide column is fixedly arranged on the rear end surface of the nozzle plate, and the second inclined guide column has a straight section and an inclined section, and a second slot matching the second inclined guide column is arranged on the rear template, and the second inclined guide column is inserted into the locking block to drive the locking block to slide until it is plugged into the second slot to lock the locking block.

[0013] Preferably, a panel is also provided on the front end surface of the sprue plate, the first shot mold nozzle is embedded in the panel and is connected with the first shot injection molding cavity through a first glue channel, and the second shot mold nozzle is embedded in the panel and is connected with the second shot injection molding cavity through a second glue channel.

[0014] Preferably, the side portions of the one-shot front template and the rear template, and the side portions of the two-shot front template and the rear template are respectively provided with locking switches for locking the two, the corners between the one-shot front template and the one-shot rear template, and the corners between the two-shot front template and the two-shot rear template are both penetrated by first guide rods, and the corners between the one-shot front template and the rear template, and the corners between the two-shot front template and the rear template are both penetrated by second guide rods.

[0015] The beneficial effects of the present invention are mainly reflected in: The front end position of the mold core is controlled by driving the movable plate, and the movable plate and the mold core are fixedly connected and synchronously moved by using a structure, and a switching drive mechanism is set to control the position of the mold core by controlling the position of the movable plate, and then switch the first position and the second position of the mold core, so that the front end of the mold core can be respectively connected with the first shot front mold cavity and the second shot front mold cavity through switching to form a first shot injection cavity and a second shot injection cavity, so as to coordinate the height difference between the first shot injection cavity and the second shot injection cavity. The first connecting rod and the second connecting rod in the switching drive mechanism form a linkage relationship of reverse movement through a swinging connecting piece. On the one hand, the position of the movable plate can be flexibly adjusted in the mold closing state, and on the other hand, the entire first shot mold and the second shot mold can be kept in a tightly fitted state in the mold closing state to avoid looseness, thereby ensuring the accuracy of the injection molded product; The ends of the one-shot front template, the one-shot inner cavity, and the one-shot plug-in block move synchronously with the mold closing to form the one-shot front mold cavity, and the ends of the two-shot front template, the two-shot inner cavity, and the two-shot plug-in block synchronously form the two-shot front mold cavity, and are respectively plugged with the front end of the mold core to form the one-shot injection cavity and the two-shot injection cavity, so that the one-shot injection cavity and the two-shot injection cavity are synchronously formed after the mold closing is completed, and are synchronously separated after the mold opening, so as to maximize the optimization of the production rhythm of the one-shot mold and the two-shot mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the present invention is further described below in conjunction with the accompanying drawings: Figure 1 : A schematic diagram of an embodiment of the present invention; Figure 2 : Schematic diagram of an injection molded product according to an embodiment of the present invention; Figure 3 : A cross-sectional view of an embodiment of the present invention; Figure 4 : A cross-sectional view of a first shot mold in an embodiment of the present invention; Figure 5 : Figure 4 A magnified schematic diagram of part A; Figure 6 : A cross-sectional view of a two-shot mold in an embodiment of the present invention; Figure 7 : Figure 6 A magnified schematic diagram of part B; Figure 8 : A partial structural diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0018] In the description of the scheme, it should be noted that the terms "center", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first shot", "second shot" and "third shot" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Moreover, in the description of the scheme, with the operator as a reference, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

[0019] like Figures 1 to 8As shown, the present invention discloses a two-shot injection mold, including a one-shot mold and a two-shot mold that are relatively arranged, the one-shot mold includes a matching one-shot front mold and a one-shot back mold, the two-shot mold includes a matching two-shot front mold and a two-shot back mold, the one-shot front mold has a mold mouth 101, a one-shot front template 201, the two-shot front mold has a two-shot mold mouth 102, a two-shot front template 202, the one-shot back mold and the two-shot back mold have the same structure and both have a back template 3 and a base 4, a one-shot front mold cavity is formed between the one-shot front template 201 and the back template 3 in a mold-closing state, and the two-shot front template 202 and the back template 202 are connected to each other. A two-shot front mold cavity is formed between the templates 3 in the mold closing state; a movable plate 5 which can be translated relative to the rear template 3 is arranged in the base 4, a mold core 6 is fixedly arranged on the front end face of the movable plate 5, and a switching drive mechanism which can switch its position is respectively arranged at the four corners of the movable plate 5, each of the switching drive mechanisms comprises a first connecting rod 701, a second connecting rod 702 and a swing connecting member 703, the first connecting rod 701, the second connecting rod 702 and the mold core 6 can be movably vertically penetrated in the rear template 3, the rear end of the second connecting rod 702 is fixedly connected to the front end face of the movable plate 5 as a whole, the The swing connecting member 703 is bent backward, and its two ends extend forward obliquely, and the bending part of the swing connecting member 703 is pivotally connected to the base 4, one end of the swing connecting member 703 abuts against the rear end of the first connecting rod 701, and the other end abuts against the rear end surface of the movable plate 5, so as to drive the first connecting rod 701 and the second connecting rod 702 to move synchronously in opposite directions by pivoting, and the rear end surface of the first front template 201 is formed with a first step surface that can drive the first connecting rod 701 to move backward, and the first step surface limits the movable plate 5 to the first position in the mold closing state, and the mold core 6 is located at the first position. A first-shot injection molding cavity 100 is formed with the first-shot front mold cavity and can be communicated with the first-shot mold nozzle 101; a second step surface is formed on the rear end face of the second-shot front mold plate 202 and can drive the second connecting rod 702 to move backward, and the second step surface limits the movable plate 5 to the second position in the mold closing state, and the mold core 6 at the second position forms a second-shot injection molding cavity 200 that can be communicated with the second-shot mold nozzle 102 with the first-shot front mold cavity, and the first-shot rear mold and the second-shot rear mold are relatively fixed on a turntable to alternately close the mold with the first-shot front mold and the second-shot front mold by synchronously rotating 180° to perform two-color injection molding.

[0020] like Figure 2As shown, the final product is formed by the first shot product 20 molded by the first shot injection molding cavity 100 and the second shot product 21 molded by the second shot injection molding cavity 200. After the first shot product 20 is molded, it is synchronously moved into the second shot injection molding cavity 200 along with the front end of the mold core 6. The second shot product 21 is molded on the basis of the first shot product 20 and is arranged on the outer peripheral wall of the first shot product 20 to form the final product. Since the second shot product 21 needs to be wrapped outside the first shot product 20, the inner contour of the second shot injection molding cavity 200 is larger than the first shot injection molding cavity 100, and due to the setting requirements of the glue inlet of the second shot injection molding cavity 200, the second shot injection molding cavity 200 is lower than the first shot injection molding cavity 100. The mold core 6 in this solution is a truncated cone with a diameter that gradually decreases from the back to the front. The truncated cone structure allows the mold core 6 to meet the height difference problem between the first shot injection molding cavity 100 and the second shot injection molding cavity 200 by controlling its position forward and backward. The rear template 3 is provided with a through hole matching the mold core 6 to allow the front end of the mold core 6 to extend out.

[0021] Due to the height difference between the first-shot injection cavity 100 and the second-shot injection cavity 200, this solution controls the front end position of the mold core 6 by driving the moving plate 5, and uses the structure that the moving plate 5 and the mold core 6 are fixedly connected and move synchronously, and sets a switching drive mechanism to achieve the purpose of controlling the position of the mold core 6 by controlling the position of the moving plate 5, and then switches the first position and the second position of the mold core 6, so that the front end of the mold core 6 can be switched to be plugged with the first-shot front mold cavity and the second-shot front mold cavity to form the first-shot injection cavity 100 and the second-shot injection cavity 200, respectively, so as to coordinate the height difference between the first-shot injection cavity 100 and the second-shot injection cavity 200. The first connecting rod 701 and the second connecting rod 702 in the switching drive mechanism form a linkage relationship of reverse movement through the swing connection 703, which can flexibly adjust the position of the moving plate 5 in the mold closing state on the one hand, and ensure that the entire first-shot mold and the second-shot mold are kept in a tightly fitted state in the mold closing state on the other hand, and avoid looseness, thereby ensuring the accuracy of the injection molded product.

[0022] Furthermore, the first arm 7031 and the second arm 7032 are formed at the bend and between the two ends of the swing connection member 703, respectively. The length of the first arm 7031 is greater than that of the second arm 7032. The end of the first arm 7031 abuts against the rear end of the first connecting rod 701, and the second arm 7032 abuts against the rear end of the second connecting rod 702. Since the core 6 is provided on the movable plate 5, and its overall weight is greater than that of the first connecting rod 701, the longer structure of the first arm 7031 can assist the first connecting rod 701 to conveniently drive the movable plate 5.

[0023] like Figure 3 and Figure 8As shown, the rear end surface of the first shot pre-form plate 201 has a first pressing block 203 facing the front end of the first connecting rod 701 and a first groove 204 facing the front end of the second connecting rod 702, and the first pressing block 203 and the first groove 204 constitute the first step surface; the rear end surface of the second shot pre-form plate 202 has a second pressing block 205 facing the front end of the second connecting rod 702 and a second groove 206 facing the front end of the first connecting rod 701, and the second pressing block 205 and the second groove 206 constitute the second step surface. The first pressing block 203 abuts against the first connecting rod 701, and the second pressing block 205 abuts against the second connecting rod 702 to complete the driving of the first connecting rod 701 and the second connecting rod 702.

[0024] Furthermore, a support plate 10 is provided between the rear template 3 and the base 4, the first connecting rod 701 is passed through the rear template 3, the support plate 10 and the base 4, a retaining ring 7011 is provided on the outer wall of the first connecting rod 701, a limiting groove 1001 is provided in the support plate 10, and the retaining ring 7011 is slidably provided in the limiting groove 1001 to limit the upward limit position of the first connecting rod 701.

[0025] like Figure 4-Figure 7 As shown, a pre-shooting module 801 is fixedly connected to the rear end face of the pre-shooting template 201, and a shooting fixed mold core 802 is fixedly provided on the rear template 3. A receiving groove matching the shooting fixed mold core 802 is provided in the pre-shooting module 801, so that the shooting fixed mold core 802 is confined in the receiving groove when the pre-shooting module 801 abuts against the rear template 3. The shooting fixed mold core 802 has a shooting inner cavity, and a shooting plug block 803 is slidably inserted on one side of the shooting fixed mold core 802. The rear template 3 is provided with a socket for inserting the front end of the mold core 6. The pre-shooting module 801, the shooting inner cavity, the shooting plug block 803 and the front end of the mold core 6 together constitute the pre-shooting mold cavity. Preferably, the two one-shot fixed mold cores 802 are arranged side by side at intervals, and two accommodating grooves are arranged side by side at intervals inside the one-shot pre-module 801 to adapt to the two one-shot fixed mold cores 802, so that two products can be injection molded each time.

[0026] Similarly, a two-shot front module 901 is fixedly connected to the rear end face of the two-shot front template 202, and a two-shot fixed mold core 902 is fixedly provided on the rear template 3. A receiving groove matching the two-shot fixed mold core 902 is provided in the two-shot front module 901, so that the two-shot fixed mold core 902 is confined in the receiving groove when the two-shot front module 901 abuts against the rear template 3. The two-shot fixed mold core 902 has a two-shot inner cavity, and a two-shot insertion block 903 is slidably inserted on one side of the two-shot fixed mold core 902. The two-shot front module 901, the two-shot inner cavity, the two-shot insertion block 903 and the front end of the mold core 6 together constitute the two-shot front mold cavity. The two two-shot fixed mold cores 902 are arranged side by side at intervals, and two receiving grooves are arranged side by side at intervals inside the two-shot front module 901 to adapt to the two two-shot fixed mold cores 902.

[0027] The front end faces of the first-shot front template 201 and the second-shot front template 202 are both provided with a sprue plate 12, and the rear end faces of the sprue plate 12 are both fixedly provided with a first inclined guide column 11, the first inclined guide column 11 having a straight section and an inclined section, the first-shot front template 201 and the second-shot front template 202 have straight holes matching the straight sections, the first-shot plug-in block 803 and the second-shot plug-in block 903 are provided with inclined holes matching the inclined sections, the first inclined guide column 11 drives the first-shot plug-in block 803 and the second-shot plug-in block 903 to move by inserting or pulling out the straight holes and the inclined holes in turn, the front end face of the rear template 3 is provided with a first slot 301 plugged with the end of the first inclined guide column 11, and the first inclined guide column 11 is inserted into the first slot 301 to complete the mold closing. The first inclined guide column 11 has a structure of a straight section and an inclined section so that when the mold is opened or closed, the inclined section of the first inclined guide column 11 drives the first shot block 803 and the second shot block 903 to move, and the straight section moves upward to make the gate plate 12 and the first shot front template 201 and the second shot front template 202 still maintain a close relationship without separating.

[0028] The left and right sides of the first-shot pre-module 801 and the second-shot pre-module 901 are respectively provided with locking blocks 13 that are opposite to the sides of the first-shot fixed mold core 802 and the second-shot fixed mold core 902. The locking blocks 13 are slidably arranged on the rear template 3. A second inclined guide column 1301 is fixedly arranged on the rear end surface of the nozzle plate 12. The second inclined guide column 1301 has a straight section and an inclined section. The rear template 3 is provided with a second slot 302 that matches the second inclined guide column 1301. The second inclined guide column 1301 is inserted into the locking block 13 to drive the locking block 13 to slide until it is plugged into the second slot 302 to lock the locking block 13. The working principle of the second inclined guide column 1301 driving the locking block 13 to move is the same as that of the first inclined guide column 11 driving the first-shot plug-in block 803 and the second-shot plug-in block 903, which will not be repeated here. The locking block 13 may be further configured to cooperate with the first-shot pre-module 801 and the second-shot pre-module 901 to stably define the first-shot fixed mold core 802 and the second-shot fixed mold core 902 .

[0029] A panel 14 is also provided on the front end surface of the sprue plate 12, the first injection mold nozzle 101 is embedded in the panel 14 and is connected to the first injection molding cavity 100 through the first glue channel 103, and the second injection mold nozzle 102 is embedded in the panel 14 and is connected to the second injection molding cavity 200 through the second glue channel 104.

[0030] In addition, the side portions of the one-shot front template 201 and the rear template 3, and the side portions of the two-shot front template 202 and the rear template 3 are respectively provided with locking switches 17 for locking the two. The locking switches 17 are used to lock the one-shot front mold and the one-shot rear mold or the two-shot rear mold matched therewith, and the two-shot front mold and the two-shot rear mold or the one-shot rear mold matched therewith in the mold closing state. The locking switches 17 are prior art and will not be described in detail here.

[0031] The corners between the one-shot front mold and the one-shot rear mold, and the corners between the two-shot front mold and the two-shot rear mold are penetrated with first guide rods 15, and the corners between the one-shot front mold plate 201 and the rear mold plate 3, and the corners between the two-shot front mold plate 202 and the rear mold plate 3 are penetrated with second guide rods 16. The rear end of the first guide rod 15 is fixedly connected to the base 4, and the front end of the second guide rod 16 is fixedly connected to the gate plate 12. The arrangement of the first guide rod 15 and the second guide rod 16 can further assist the one-shot mold and the two-shot mold in mold closing or mold opening.

[0032] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0033] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A two-shot injection mold, comprising a first-shot mold and a second-shot mold arranged opposite to each other, wherein the first-shot mold comprises a first-shot front mold and a first-shot rear mold that are matched, and the second-shot mold comprises a second-shot front mold and a second-shot rear mold that are matched, characterized in that: The one-shot front mold has a mold nozzle (101) and a one-shot front template (201); the two-shot front mold has a two-shot mold nozzle (102) and a two-shot front template (202); the one-shot rear mold and the two-shot rear mold have the same structure and both have a rear template (3) and a base (4); a one-shot front mold cavity is formed between the one-shot front template (201) and the rear template (3) in a mold-clamped state; and a two-shot front mold cavity is formed between the two-shot front template (202) and the rear template (3) in a mold-clamped state; A movable plate (5) is arranged in the base (4) and can be translated relative to the rear template (3). A mold core (6) is fixedly arranged on the front end surface of the movable plate (5), and a switching drive mechanism capable of switching its position is respectively arranged at the four corners of the movable plate (5). Each of the switching drive mechanisms comprises a first connecting rod (701), a second connecting rod (702) and a swing connecting member (703). The first connecting rod (701), the second connecting rod (702) and the mold core (6) are all movably and vertically arranged in the rear template (3). The rear end of the second connecting rod (702) is fixedly connected to the front end surface of the movable plate (5) as a whole. The swing connecting member (703) is bent backwards, and its two ends extend forward obliquely. The bending part of the swing connecting member (703) is pivotally connected to the base (4). One end of the swing connecting member (703) abuts against the rear end of the first connecting rod (701), and the other end abuts against the rear end surface of the movable plate (5) so as to be movable by The first connecting rod (701) and the second connecting rod (702) are pivoted to drive the first connecting rod (701) and the second connecting rod (702) to move synchronously in opposite directions. The rear end surface of the first-shot front mold plate (201) is formed with a first step surface that can drive the first connecting rod (701) to move backward. The first step surface limits the movable plate (5) to a first position in the mold closing state. When the mold core (6) is in the first position, it forms a first-shot injection mold cavity (100) with the first-shot front mold cavity that can be connected to the first-shot mold nozzle (101). A second step surface capable of driving the second connecting rod (702) to move backward is formed on the rear end surface of the plate (202); the second step surface limits the movable plate (5) to a second position in the mold closing state; the mold core (6) in the second position and the second-shot front mold cavity form a second-shot injection molding cavity (200) capable of communicating with the second-shot mold nozzle (102); the first-shot rear mold and the second-shot rear mold are alternately molded with the first-shot front mold and the second-shot front mold by synchronously rotating 180 degrees to perform two-color injection molding.

2. The two-color injection mold according to claim 1, characterized in that: The mold core (6) is in the shape of a truncated cone with a diameter that gradually decreases from the back to the front, and the rear mold plate (3) is provided with a through hole that matches the mold core (6) so that the front end of the mold core (6) can protrude.

3. The two-color injection mold according to claim 2, characterized in that: The rear end surface of the first-shot front template (201) comprises a first pressing block (203) directly opposite to the front end of the first connecting rod (701) and a first groove (204) directly opposite to the front end of the second connecting rod (702); the first pressing block (203) and the first groove (204) constitute the first step surface; the rear end surface of the second-shot front template (202) comprises a second pressing block (205) directly opposite to the front end of the second connecting rod (702) and a second groove (206) directly opposite to the front end of the first connecting rod (701); the second pressing block (205) and the second groove (206) constitute the second step surface.

4. The two-color injection mold according to claim 3, characterized in that: A support plate (10) is further provided between the rear template (3) and the base (4); the first connecting rod (701) is passed through the rear template (3), the support plate (10) and the base (4); a retaining ring (7011) is provided on the outer wall of the first connecting rod (701); a limiting groove (1001) is provided in the support plate (10); the retaining ring (7011) is slidably provided in the limiting groove (1001) to limit the upward movement limit position of the first connecting rod (701).

5. The two-color injection mold according to claim 4, characterized in that: A pre-shooting module (801) is fixedly connected to the rear end face of the pre-shooting template (201), and a shooting fixed mold core (802) is fixedly provided on the rear template (3). A receiving groove matching the shooting fixed mold core (802) is provided in the pre-shooting module (801), so that the shooting fixed mold core (802) is confined in the receiving groove when the pre-shooting module (801) abuts against the rear template (3). The shooting fixed mold core (802) has a shooting inner cavity, and a shooting plug block (803) is slidably inserted on one side of the shooting fixed mold core (802). The rear template (3) is provided with a plug hole into which the front end of the mold core (6) can be inserted. The pre-shooting module (801), the shooting inner cavity, and the end of the shooting plug block (803) together constitute the pre-shooting mold cavity.

6. The two-color injection mold according to claim 5, characterized in that: A second-shot front module (901) is fixedly connected to the rear end surface of the second-shot front template (202); a second-shot fixed mold core (902) is fixedly provided on the rear template (3); a receiving groove matching the second-shot fixed mold core (902) is provided in the second-shot front module (901), so that the second-shot fixed mold core (902) is confined in the receiving groove when the second-shot front module (901) abuts against the rear template (3); a second-shot inner cavity is provided in the second-shot fixed mold core (902), and a second-shot insertion block (903) is slidably inserted on one side of the second-shot fixed mold core (902); the second-shot front module (901), the second-shot inner cavity, and the end of the second-shot insertion block (903) together constitute the second-shot front mold cavity.

7. The two-color injection mold according to claim 6, characterized in that: The front end surfaces of the first-shot front template (201) and the second-shot front template (202) are both provided with a nozzle plate (12), and the rear end surface of the nozzle plate (12) is both fixedly provided with a first inclined guide column (11), the first inclined guide column (11) having a straight section and an inclined section, the first-shot front template (201) and the second-shot front template (202) have straight holes matching the straight sections, the first-shot plug-in block (803) and the second-shot plug-in block (903) are provided with inclined holes matching the inclined sections, the first inclined guide column (11) drives the first-shot plug-in block (803) and the second-shot plug-in block (903) to move by inserting or pulling out the straight holes and the inclined holes in sequence, and the front end surface of the rear template (3) is provided with a first slot (301) plugged into the end of the first inclined guide column (11).

8. The two-color injection mold according to claim 7, characterized in that: Locking blocks (13) facing the side parts of the first-shot fixed mold core (802) and the second-shot fixed mold core (902) are respectively arranged on the left and right sides of the first-shot front module (801) and the second-shot front module (901); the locking blocks (13) are slidably arranged on the rear template (3); a second inclined guide column (1301) is fixedly arranged on the rear end surface of the nozzle plate (12); the second inclined guide column (1301) has a straight section and an inclined section; a second slot (302) matching the second inclined guide column (1301) is arranged on the rear template (3); the second inclined guide column (1301) is inserted into the locking block (13) to drive the locking block (13) to slide until it is plugged into the second slot (302) to lock the locking block (13).

9. The two-color injection mold according to claim 7, characterized in that: A panel (14) is also provided on the front end surface of the nozzle plate (12); the first-shot mold nozzle (101) is embedded in the panel (14) and is connected to the first-shot injection molding cavity (100) via a first glue channel (103); and the second-shot mold nozzle (102) is embedded in the panel (14) and is connected to the second-shot injection molding cavity (200) via a second glue channel (104).

10. The two-color injection mold according to claim 9, characterized in that: The side portions of the first-shot front template (201) and the rear template (3), and the side portions of the second-shot front template (202) and the rear template (3) are respectively provided with locking switches (17) for locking the two. The corners between the first-shot front template and the first-shot rear template, and the corners between the second-shot front template and the second-shot rear template are both penetrated with first guide rods (15). The corners between the first-shot front template (201) and the rear template (3), and the corners between the second-shot front template (202) and the rear template (3) are both penetrated with second guide rods (16).

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