Ejection mechanism of a two-color injection mold

Abstract

The present invention relates to an ejection mechanism for a two-color injection mold, belonging to the technical field of plastic product production. The ejection mechanism of the two-color injection mold includes a mold body having a cavity, a first ejector plate group, a second ejector plate group, and a driving member. The first and second ejector plate groups are both slidably disposed on a side of the mold body away from the cavity. The driving member corresponds to the first and second ejector plate groups, respectively, and is used to drive the corresponding first or second ejector plate group toward or away from the cavity of the mold body. The first ejector plate group is provided with an ejector body, which slides through the mold body and extends into the cavity. The second ejector plate group is provided with a disengagement component for disengaging the product from the end of the ejector body. The present invention facilitates product removal.

Description

Technical Field

[0001] The invention relates to the technical field of plastic product production, in particular to an ejection mechanism of a double-color injection mold. Background Art

[0002] Injection molding is an important process in the production of laptop shells. To optimize the functionality of laptop shells, two-color injection molds are often used to form integrated two-color or multi-color products.

[0003] In existing two-shot molds, the ejector pin of the mold's ejector mechanism forms part of the mold cavity's inner wall during molding. After molding, the ejector pin ejects the product, freeing it from the mold cavity. However, for products with complex structures, such as those requiring grooves on the surface, the end of the ejector pin extends into the mold cavity during molding. After molding, the product wraps around the pin, causing it to remain attached to the pin after being ejected, making removal difficult. Summary of the Invention

[0004] In order to facilitate taking out of products, the present invention provides an ejection mechanism for a two-color injection mold.

[0005] The present invention provides an ejection mechanism for a two-color injection mold that adopts the following technical solutions:

[0006] A two-color injection mold ejection mechanism includes a mold body having a cavity, and also includes a first ejector plate group, a second ejector plate group and a driving member. The first ejector plate group and the second ejector plate group are both slidably arranged on a side of the mold body away from the cavity. The driving member corresponds to the first ejector plate group and the second ejector plate group respectively. The driving member is used to drive the corresponding first ejector plate group or second ejector plate group toward or away from the cavity of the mold body. The first ejector plate group is provided with an ejector body, which slides through the mold body and extends into the cavity. The second ejector plate group is provided with a disengagement component for disengaging the product from the end of the ejector body.

[0007] Preferably, the disengagement assembly includes an ejector wire drum arranged in the second ejector plate group, the ejector body is slidably inserted into the ejector wire drum, the second ejector plate group is located above the first ejector plate group, and when the product is formed, the end face of the ejector wire drum close to the cavity side serves as part of the inner wall of the cavity.

[0008] Preferably, the ejection mechanism also includes a bottom plate connected to the mold body, the first ejection plate group and the second ejection plate group are both located between the bottom plate and the mold body, a limiting cylinder is provided on the bottom plate, a limiting disk is provided on the end of the ejection body away from the cavity, the cross-sectional area of ​​the limiting disk is larger than the cross-sectional area of ​​the ejection body, a limiting groove is provided in the limiting cylinder for slidingly cooperating with the limiting disk, and the inner wall of the limiting groove has a limiting end surface for limiting the sliding of the limiting disk.

[0009] Preferably, the first ejector plate group is provided with an inclined ejector body, and the inclined ejector body includes an inclined rod slidably arranged on the mold body and a push rod arranged on the first ejector plate group. The sliding direction of the inclined rod is inclined, and an inner buckle groove for product molding is provided on the side where the angle between the inclined rod and the inner wall of the cavity is greater than 90 degrees. A matching groove is provided on the end of the push rod close to the mold body, and the end of the inclined rod away from the cavity is movably arranged in the matching groove.

[0010] Preferably, the first ejector plate group and the second ejector plate group are both provided with straight ejector bodies, and the straight ejector bodies are slidably provided on the mold body.

[0011] Preferably, the ejector body includes an ejection part arranged on the first ejection plate group and a forming part slidably arranged at the end of the ejection part, the ejection part is slidably penetrated on the mold body, the forming part is arc-shaped, and the forming part moves circumferentially along its own center of circle. When the product is molded, one end of the forming part is located in the mold cavity and the other end is located in the ejection part; the disengagement component is used to drive the forming part to move toward the direction close to the inside of the ejection part so that the forming part is separated from the product.

[0012] Preferably, the disengagement assembly includes a transmission body arranged on the second ejection plate group and a transmission member arranged on the transmission body, the transmission body is slidably penetrated on the ejection part, and the transmission member is used to drive the forming part to move toward or away from the inside of the ejection part when the transmission body and the ejection part slide relative to each other.

[0013] Preferably, the transmission member includes a rotating shaft rotatably arranged in the ejection part, a first connecting rod sleeved on the rotating shaft, a second connecting rod hinged on the forming part, a first gear sleeved on the rotating shaft and a first rack arranged on the transmission body, the rotation axis of the rotating shaft is parallel to the axis of the forming part, the length of the first connecting rod is equal to the length from the forming part to its own center of circle, and the end of the first connecting rod away from the rotating shaft is hinged to the second connecting rod.

[0014] Preferably, the second ejector plate group is located below the first ejector plate group.

[0015] Preferably, the center of the forming portion and the end surface of the ejection portion close to the cavity are located in the same plane.

[0016] In summary, the present invention has the following beneficial technical effects:

[0017] When the product is being molded, the end of the ejector body extends into the mold cavity, thereby forming a groove structure on the product; after the product is molded, the first ejector plate group and the second ejector plate group are respectively driven by the driving member to move toward the direction close to the mold body, and the product is ejected from the mold cavity by the ejector body. At this time, the end of the ejector body is still embedded in the product, and then the product is separated from the end of the ejector body by the separation component, thereby facilitating the removal of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present invention.

[0019] Figure 2 This is a first structural cross-sectional view of Example 1 of the present invention.

[0020] Figure 3 It is a cross-sectional view of the overall structure of the ejector body and the separation assembly in Example 1 of the present invention.

[0021] Figure 4 This is a second structural cross-sectional view of Example 1 of the present invention.

[0022] Figure 5 It is a cross-sectional view of the overall structure of the inclined top body in Example 1 of the present invention.

[0023] Figure 6 It is a cross-sectional view of the overall structure of Example 2 of the present invention.

[0024] Figure 7 yes Figure 6 Enlarged view of part A.

[0025] Explanation of the accompanying symbols: 1. mold body; 2. cavity; 3. ejector wire drum; 4. bottom plate; 5. limiting cylinder; 6. limiting disk; 7. limiting groove; 8. limiting end surface; 9. inclined ejector; 91. inclined rod; 92. push rod; 10. inner buckle groove; 11. matching groove; 12. straight ejector; 13. ejector part; 14. forming part; 15. transmission body; 16. rotating shaft; 17. first connecting rod; 18. second connecting rod; 19. first connecting rod A gear; 20. A first rack; 21. A support seat; 22. A first ejector plate; 23. A first additional ejector plate; 25. A fixed wire drum; 26. A ejector rod; 27. A second ejector plate; 28. A second additional ejector plate; 29. ​​A third ejector plate; 30. A fourth ejector plate; 31. A receiving groove; 32. An inclined push rod; 33. A transmission plate; 34. A second rack; 35. A second gear; 36. A third rack; 37. A support rod. DETAILED DESCRIPTION

[0026] The following combination Figure 1-Figure 7The present invention is described in further detail.

[0027] Example 1:

[0028] The embodiment of the present invention discloses an ejection mechanism for a two-color injection mold. Figure 1 The ejection mechanism of the two-color injection mold includes a base plate 4, a mold body 1, a first ejector plate group, a second ejector plate group and a driving member. The base plate 4 is used to be installed on the mold frame. The cross section of the base plate 4 is rectangular. Support seats 21 are fixed on both sides of the width direction of the base plate 4. The mold body 1 is fixedly mounted on the side of the support seat 21 away from the base plate 4. The center of the mold body 1 away from the side of the base plate 4 has a cavity 2 for injection molding the product. Specifically, the mold body 1 in the present invention is a male mold. In other embodiments, the mold body 1 can be a front mold. The base plate 4 can drive the mold body 1 to move as a whole through a driving source such as a hydraulic cylinder or a pneumatic cylinder on the mold frame to achieve mold closing and mold opening.

[0029] Reference Figure 1 and Figure 2 The first ejector plate group and the second ejector plate group are both slidably arranged on the side of the mold body 1 away from the cavity 2. Specifically, the first ejector plate group and the second ejector plate group are both located between the base plate 4 and the mold body 1, and the arrangement direction and movement direction of the first ejector plate group and the second ejector plate group are parallel to the arrangement direction of the mold body 1 and the base plate 4. The support seats 21 on both sides can guide the sliding of the first ejector plate group and the second ejector plate group. The driving member corresponds to the first ejector plate group and the second ejector plate group respectively, and the driving member is used to drive the corresponding first ejector plate group or second ejector plate group to move toward or away from the mold body 1. The first ejector plate group is provided with an ejector body, which slides through the mold body 1 and extends into the cavity 2. The second ejector plate group is provided with a disengagement component for disengaging the product from the end of the ejector body.

[0030] When the product is being formed, the end of the ejector body extends into the cavity 2, so that the product can wrap the end of the ejector body, forming a groove structure on the product; after the product is formed, the first ejector plate group and the second ejector plate group are respectively driven by the driving member to move toward the direction close to the mold body 1, and then the ejector body ejects the product from the cavity 2. At this time, the end of the ejector body is still embedded in the product, and then the second ejector plate group moves to cause the separation assembly to separate the product from the end of the ejector body, thereby facilitating the removal of the product.

[0031] Reference Figure 1 and Figure 2To facilitate the installation of the ejector body, the first ejector plate group includes a first ejector plate 22 and a first additional ejector plate 23. The first ejector plate 22 is fixed above the first additional ejector plate 23, and the ejector body is arranged on the first ejector plate 22; the first additional ejector plate 23 can limit the ejector structure on the first ejector plate 22 to a certain extent. Furthermore, the driving component corresponding to the first ejector plate group includes a first hydraulic cylinder. The first hydraulic cylinder is installed in the mold frame, and the piston rod of the first hydraulic cylinder slides through the bottom plate 4 and is fixedly connected to the bottom wall of the first additional ejector plate 23.

[0032] By activating the first hydraulic cylinder in the mold frame, the corresponding first ejector plate 22 and the first additional ejector plate 23 can be driven to slide toward or away from the mold body 1, so as to drive the ejector body to eject the product or reset the ejector body.

[0033] Reference Figure 2 and Figure 3 To facilitate the formation of a groove structure on the product, the ejector body includes a fixed wire barrel 25 and a push rod 26. The fixed wire barrel 25 is fixedly mounted on the first ejector plate 22 and the first additional ejector plate 23 and extends downward. The push rod 26 is fixedly mounted within the fixed wire barrel 25, and the upper end of the push rod 26 slides through the mold body 1. When the product is formed, the end of the push rod 26 near the mold body 1 extends into the mold cavity 2, so that the product is wrapped around the end of the push rod 26 after forming. After the product is separated from the push rod 26, a cylindrical groove can be reserved on the product, facilitating subsequent installation of the product. Multiple ejector bodies can be provided as needed, and the positions of the multiple ejector bodies are arranged according to the actual needs of the product. The separation components correspond one to one with the ejector bodies.

[0034] Reference Figure 2 To facilitate the installation of the disengagement component, the second ejector plate assembly is located above the first ejector plate assembly, and the ejector rod 26 slides through. Specifically, the second ejector plate assembly includes a second ejector plate 27 and a second additional ejector plate 28. The second ejector plate 27 is fixed above the second additional ejector plate 28, and the ejector rod 26 slides through the second ejector plate 27 and the second additional ejector plate 28.

[0035] Reference Figure 2 To facilitate the movement of the second ejector plate assembly, the corresponding driving member includes a second hydraulic cylinder installed within the mold frame. The piston rod of the second hydraulic cylinder slides sequentially through the bottom plate 4, the first additional ejector plate 23, and the first ejector plate 22, which is fixedly connected to the bottom wall of the second additional ejector plate 28. By activating the second hydraulic cylinder within the mold frame, the corresponding second ejector plate 27 and the second additional ejector plate 28 are driven to slide toward or away from the mold body 1, thereby driving the disengagement assembly.

[0036] Reference Figure 2 and Figure 3In order to facilitate the separation of the product from the end of the ejector rod 26, the separation component includes an ejector wire drum 3, which is fixedly installed on the second ejector pin plate 27 and extends upward and slides through the mold body 1. The setting of the second additional ejector pin plate 28 can limit the ejector structure on the second ejector pin plate 27; the ejector rod 26 is coaxially arranged with the ejector wire drum 3, and the ejector rod 26 slides through the corresponding ejector wire drum 3. When the product is formed, the end surface of the ejector wire drum 3 close to the cavity 2 serves as part of the inner wall of the cavity 2.

[0037] After the product is formed, the first ejector plate 22 and the first additional ejector plate 23 of the first ejector plate group and the second ejector plate 27 and the second additional ejector plate 28 of the second ejector plate group are driven by the driving member to move synchronously toward the direction close to the mold body 1, and the product is ejected from the cavity 2 by the ejector body and the ejector wire drum 3. At this time, the end of the ejector body is still embedded in the product. Then the first ejector plate group stops moving, and the second hydraulic cylinder drives the second ejector plate 27 and the second additional ejector plate 28 to continue to move upward, so that the ejector wire drum 3 pushes the product, so that the product is separated from the end of the ejector rod 26, thereby facilitating the removal of the product.

[0038] Reference Figure 2 and Figure 3 , a limiting cylinder 5 is fixed on the bottom plate 4, the limiting cylinder 5 corresponds to the ejector rod 26 one by one, the limiting cylinder 5 and the ejector rod 26 are coaxially arranged, the ejector rod 26 and the fixed wire drum 25 are slidably penetrated in the limiting cylinder 5, and a limiting disk 6 is fixed on the end of the ejector rod 26 away from the cavity 2, the cross-sectional area of ​​the limiting disk 6 is larger than the cross-sectional area of ​​the fixed wire drum 25, and the limiting disk 6 abuts against the end of the fixed wire drum 25 away from the mold body 1; a limiting groove 7 is provided in the limiting cylinder 5, which slides with the limiting disk 6, and the inner wall of the limiting groove 7 close to the end of the mold body 1 has a limiting end surface 8 for limiting the sliding of the limiting disk 6.

[0039] When the product is being formed, the limit plate 6 abuts against the inner wall of the bottom plate 4, thereby further limiting the position of the ejector rod 26; when the first ejection plate group drives the ejector rod 26 and the fixed wire drum 25 to move upward and be ejected, the limit plate 6 slides in the limit groove 7 until the limit plate 6 abuts against the limit end surface 8 of the end surface of the limit groove 7, which helps to limit the upward movement of the ejector rod 26, facilitates the separation of the ejector rod 26 from the product, and makes it difficult for the ejector rod 26 to separate from the fixed wire drum 25.

[0040] Reference Figure 2Both the first and second ejector plate assemblies are fixed with straight ejector bodies 12, which slide through the mold body 1. During product molding, the end surface of the straight ejector bodies 12 near the cavity 2 serves as part of the inner wall of the cavity 2. Specifically, the straight ejector bodies 12 corresponding to the first ejector plate assembly are fixed to the first ejector plate 22 and slide through the second ejector plate 27 and the second additional ejector plate 28. Multiple straight ejector bodies 12 are provided on the second ejector plate 27, distributed circumferentially around the edge of the cavity 2. The straight ejector bodies 12 corresponding to the second ejector plate assembly are fixed to the second ejector plate 27, provided with multiple straight ejector bodies 12, and concentrated at the sprue of the cavity 2.

[0041] After the first shot, only the second ejector plate 27 can be driven upward to eject the product from the straight ejector body 12 at the water inlet, facilitating the second shot. After the second shot, the first ejector plate 22 and the second ejector plate 27 can be driven upward synchronously to eject the product completely.

[0042] Reference Figure 2 To facilitate the ejection of the product, the straight ejector body 12 can be a round rod, or it can include a connector and a straight ejector rod. The connector is fixed on the corresponding first ejector plate 22 or the second ejector plate 27, and the straight ejector rod is connected to the corresponding connector. The straight ejector rod is slidably arranged in the mold body 1.

[0043] Reference Figure 4 and Figure 5 The first ejector plate group is provided with an inclined ejector body 9, which includes an inclined rod 91 and a push rod 92. The inclined rod 91 is slidably penetrated on the mold body 1, and the sliding direction of the inclined rod 91 is inclined. The side at which the angle between the inclined rod 91 and the inner wall of the cavity 2 is greater than 90 degrees is provided with an inner buckle groove 10 for product molding. The push rod 92 is fixed on the first ejector plate 22 of the first ejector plate group, and the push rod 92 slides through the second additional ejector plate 28 and the second ejector plate 27. A matching groove 11 is provided on the end of the push rod 92 close to the mold body 1, and the end of the inclined rod 91 away from the cavity 2 is movably provided in the matching groove 11.

[0044] During molding, a portion of the product is buckled inwardly in the buckle groove 10 of the inclined rod 91; after the product is formed, the first ejector plate 22 moves upward to cause the push rod 92 to abut against the inclined rod 91 and move upward, thereby causing the inclined rod 91 to achieve a lateral displacement change during the upward movement to move away from the buckled portion of the product, making it easier to remove the buckled portion of the product from the inclined rod 91 without causing interference.

[0045] The implementation principle of Example 1 of the present invention is as follows: when the product is being formed, the end of the ejector pin 26 in the ejector body extends into the mold cavity 2, so that the product can be wrapped around the end of the ejector pin 26 to form a trough structure, which facilitates the subsequent installation of the product.

[0046] After the product is formed, the first hydraulic cylinder and the second hydraulic cylinder are started to drive the first ejector plate group and the second ejector plate group to move synchronously toward the direction close to the mold body 1, and the ejector rod 26 and the ejector wire drum 3 eject the product from the cavity 2. At this time, the end of the ejector rod 26 is still embedded in the product. Then the first ejector plate group stops moving, and the second hydraulic cylinder drives the second ejector plate 27 to continue to move upward, so that the ejector wire drum 3 can push the product and separate the product from the end of the ejector rod 26, thereby facilitating the removal of the product.

[0047] Example 2:

[0048] Reference Figure 6 and Figure 7 The difference between this embodiment and Example 1 is that the first ejector plate group includes a third ejector plate 29, the second ejector plate group includes a fourth ejector plate 30, the third ejector plate 29 is located above the fourth ejector plate 30, the piston rod of the first hydraulic cylinder corresponding to the first ejector plate group slides through the bottom plate 4 and is fixedly connected to the bottom of the third ejector plate 29, and the piston rod of the second hydraulic cylinder corresponding to the second ejector plate group slides through the bottom plate 4 and is fixed to the bottom wall of the fourth ejector plate 30.

[0049] Reference Figure 6 and Figure 7 Furthermore, the ejector body includes an ejection portion 13 and a molding portion 14. The ejection portion 13 is fixed on the third ejector plate 29. The ejection portion 13 is slidably inserted into the mold body 1. The sliding direction of the ejection portion 13 is parallel to the arrangement direction of the mold body 1 and the bottom plate 4. When the product is molded, the end surface of the ejection portion 13 close to the cavity 2 serves as a part of the inner wall of the cavity 2.

[0050] Reference Figure 6 and Figure 7 The molding part 14 slides through the end of the ejection part 13. The molding part 14 is arc-shaped. Specifically, the center angle of the molding part 14 is 180 degrees. The molding part 14 moves circumferentially along its own center. The center of the molding part 14 and the end surface of the ejection part 13 near the mold cavity 2 are located in the same plane. The ejection part 13 is provided with a receiving groove 31 for accommodating the molding part 14. The receiving groove 31 is provided along the circumferential direction of the center of the molding part 14. When the product is formed, one end of the molding part 14 is located in the mold cavity 2, and the other end is located in the receiving groove 31 of the ejection part 13. The disengagement assembly is used to drive the molding part 14 to move toward the inside of the ejection part 13 to disengage the molding part 14 from the product.

[0051] During product molding, one end of the molding portion 14 is located within the mold cavity 2, and the other end is located within the ejection portion 13, thereby facilitating the formation of an arc-shaped groove on the product. After the product is formed, the first and second hydraulic cylinders drive the third and fourth ejector plates 29 and 30 to move upward synchronously, ejecting the product from the mold cavity 2. The disengagement assembly then drives the molding portion 14 toward the receiving groove 31 on the ejection portion 13, thereby facilitating the separation of the molding portion 14 from the product and facilitating its removal.

[0052] Reference Figure 6 and Figure 7 In order to facilitate the movement of the molding part 14, the disengagement assembly includes a transmission body 15 and a transmission member. The transmission body 15 is fixed to the fourth ejector plate 30 of the second ejector plate group. The transmission body 15 is slidably penetrated through the end of the ejection part 13 away from the cavity 2. The sliding direction of the transmission body 15 is parallel to the arrangement direction of the mold body 1 and the bottom plate 4. The transmission member is provided on the transmission body 15. The transmission member is used to drive the molding part 14 toward or away from the inside of the ejection part 13 when the transmission body 15 and the ejection part 13 slide relative to each other. Specifically, when the transmission body 15 moves in the direction away from the mold body 1, the molding part 14 moves toward the direction of the accommodating groove 31 of the ejection part 13.

[0053] Reference Figure 6 and Figure 7 In order to facilitate the relative sliding of the transmission body 15 and the ejection part 13 to drive the forming part 14 to move toward or away from the inside of the ejection part 13, the transmission member includes a rotating shaft 16, a first connecting rod 17, a second connecting rod 18, a first gear 19 and a first rack 20. The rotating shaft 16 rotates in the ejection part 13. The rotation axis of the rotating shaft 16 is parallel to the axis of the forming part 14. The rotating shaft 16 is located directly below the center of the forming part 14. The first connecting rod 17 is fixedly sleeved on the rotating shaft 16. The length of the first connecting rod 17 is equal to that of the forming part 1 4 to its own center of the circle, a fixed shaft is fixed to the end of the forming part 14 located in the accommodating groove 31, one end of the second connecting rod 18 is hinged to the end of the first connecting rod 17 away from the rotating shaft 16, and the other end is hinged to the fixed shaft of the forming part 14, and the length direction of the second connecting rod 18 is parallel to the sliding direction of the first ejector plate assembly; because the accommodating groove 31 limits the sliding direction of the forming part 14, a four-bar linkage can be realized through the first connecting rod 17 and the second connecting rod 18, so that when the rotating shaft 16 rotates, the forming part 14 is driven to move synchronously.

[0054] Reference Figure 6 and Figure 7The first gear 19 is coaxially fixed on the rotating shaft 16, and the first rack 20 is fixed on the transmission body 15. The length direction of the first rack 20 is parallel to the moving direction of the transmission body 15. The first gear 19 is engaged with the first rack 20, so that when the transmission body 15 moves, the rotating shaft 16 can be driven to rotate through the engagement of the first gear 19 and the first rack 20.

[0055] Reference Figure 6 and Figure 7 In an embodiment of the present invention, the straight ejector 12 at the water inlet is arranged on the third ejector plate 29 , while the inclined ejector 9 and the straight ejector 12 located at the edge of the cavity 2 can be arranged on the fourth ejector plate 30 .

[0056] Reference Figure 6 and Figure 7 In order to further facilitate the ejection of the product, an inclined push rod 32 is slidably provided on the ejection part 13. The inclined push rod 32 is located on the side of the forming part 14 away from its own center of circle. The distance between the inclined push rod 32 and the bottom plate 4 decreases in the direction away from the forming part 14. The sliding direction of the inclined push rod 32 is parallel to its own tilting direction. A transmission plate 33 is slidably provided in the ejection part 13. The sliding direction of the transmission plate 33 is parallel to the sliding direction of the transmission body 15. The transmission plate 33 is located on the side of the inclined push rod 32 away from the cavity 2. A movable groove is provided at one end of the transmission plate 33 close to the cavity 2. The lower end of the inclined push rod 32 is movably limited in the movable groove, similar to the structure of the inclined ejector body 9, so that when the transmission plate 33 moves up or down, the inclined push rod 32 can tilt and slide.

[0057] Reference Figure 6 and Figure 7 A second rack 34 is fixed on the transmission plate 33, and the length direction of the second rack 34 is parallel to the sliding direction of the transmission plate 33. A second gear 35 is rotatably provided in the ejection portion 13, and the rotation axis of the second gear 35 is parallel to the rotation axis of the rotating shaft 16, and the second gear 35 is meshed with the second rack 34; a support rod 37 is fixed on the transmission body 15, and a third rack 36 is fixed on the support rod 37, and the length direction of the third rack 36 is parallel to the sliding direction of the transmission plate 33, the second gear 35 is located between the second rack 34 and the third rack 36, and the third rack 36 is used to mesh with the second gear 35; when more than half of the structure of the forming portion 14 is located outside the ejection portion 13, the third rack 36 is located on the side of the second gear 35 away from the bottom plate 4, and is disengaged from the second gear 35; a torsion spring is sleeved on the shaft of the second gear 35, so that the transmission plate 33 will not move unnecessarily.

[0058] When the transmission body 15 gradually moves toward the direction close to the base plate 4, the forming part 14 is gradually recovered into the accommodating groove 31, and then the third rack 36 engages with the second gear 35, driving the second rack 34 to drive the transmission plate 33 to move toward the direction away from the base plate 4, thereby causing the inclined push rod 32 to push the product toward the product. In the case that the forming part 14 is too long to be completely recovered, the inclined push rod 32 can push the product obliquely from the end of the forming part 14. At the same time, it can also be used to separate the structure with a small curvature of the bottom wall of the cavity 2 from the product.

[0059] The implementation principle of Example 2 of the present invention is as follows: when the product is molded, one end of the molding part 14 is located in the mold cavity 2, and the other end is located in the ejection part 13. At this time, the transmission body 15 is relatively fixed to the ejection part 13, thereby achieving relative fixation of the molding part 14, which helps to form an arc-shaped groove body on the product.

[0060] After the product is formed, the first hydraulic cylinder and the second hydraulic cylinder are started to drive the third ejector plate 29 and the fourth ejector plate 30 to move upward synchronously, so that the ejection part 13, the molding part 14 and the transmission body 15 are synchronously moved upward, thereby ejecting the product from the cavity 2, and then the second hydraulic cylinder is started to drive the fourth ejector plate 30 to move downward, and the transmission body 15 moves downward relative to the ejection part 13, and the first gear 19 is driven to rotate through the first rack 20, and the first gear 19 drives the rotating shaft 16 and the first connecting rod 17 to rotate in the direction away from the cavity 2, and the first connecting rod 17 pulls the molding part 14 to move synchronously toward the accommodating groove 31 through the second connecting rod 18, thereby helping to separate the molding part 14 from the product and facilitate the removal of the product; at the same time, arc grooves of different depths can be formed on the product as needed.

[0061] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. An ejection mechanism for a two-color injection mold, comprising a mold body (1), wherein the mold body (1) has a mold cavity (2), and is characterized in that: The mold body (1) is provided with an ejector body, and the ejector body slides through the mold body (1) and extends into the mold cavity (2). The second ejector plate group is provided with a detachment component for detaching the product from the end of the ejector body. The ejector body includes an ejection portion (13) provided on the first ejector plate group and a molding portion (14) slidably provided at the end of the ejector portion (13). The ejection part (13) is slidably provided on the mold body (1), the forming part (14) is arc-shaped, the center angle of the forming part (14) is 180 degrees, the forming part (14) moves along the circumference of its own center, the center of the forming part (14) and the end face of the ejection part (13) close to the cavity (2) are located in the same plane, the disengagement assembly includes a transmission body (15) provided on the second ejection plate group and a transmission member provided on the transmission body (15), the transmission body (15) is slidably provided on the ejection part (13), the transmission member includes a rotating shaft (16) rotatably provided in the ejection part (13), a first connecting rod (17) sleeved on the rotating shaft (16), a second connecting rod (18) hinged on the forming part (14), and a sleeve A first gear (19) is provided on the rotating shaft (16) and a first rack (20) is provided on the transmission body (15); the rotation axis of the rotating shaft (16) is parallel to the axis of the forming part (14); the length of the first connecting rod (17) is equal to the length from the forming part (14) to its own center of circle; the first connecting rod (17) is hinged to the second connecting rod (18) at one end away from the rotating shaft (16); an inclined push rod (32) is slidably provided on the ejection part (13); the inclined push rod (32) is located on the side of the forming part (14) away from its own center of circle; a transmission plate (33) is slidably provided in the ejection part (13); a movable groove is provided at one end of the transmission plate (33) close to the cavity (2); the lower end of the inclined push rod (32) is movable and limited in the movable position. In the movable groove, a second rack (34) is fixed on the transmission plate (33), and a second gear (35) is rotatably provided in the ejection part (13), and the second gear (35) is meshed with the second rack (34); a support rod (37) is fixed on the transmission body (15), and a third rack (36) is fixed on the support rod (37), and the second gear (35) is located between the second rack (34) and the third rack (36), and the third rack (36) is used to mesh with the second gear (35); when the portion of the molding part (14) located outside the ejection part (13) is larger than half of its own structure, the third rack (36) is located on the side of the second gear (35) away from the bottom plate (4), and is in a disengaged state from the second gear (35);When the forming portion (14) is gradually retracted into the ejection portion (13), the third rack (36) engages with the second gear (35), driving the second rack (34) to drive the transmission plate (33) to move, so that the inclined push rod (32) is ejected toward the product; a torsion spring is sleeved on the shaft of the second gear (35).

2. The ejection mechanism of a two-color injection mold according to claim 1, characterized in that: The first ejector plate group is provided with an inclined ejector body (9), and the inclined ejector body (9) includes an inclined rod (91) slidably inserted into the mold body (1) and a push rod (92) provided on the first ejector plate group. The sliding direction of the inclined rod (91) is inclined. An inner buckle groove (10) for product molding is provided on a side where the angle between the inclined rod (91) and the inner wall of the cavity (2) is greater than 90 degrees. A matching groove (11) is provided on one end of the push rod (92) close to the mold body (1), and an end of the inclined rod (91) away from the cavity (2) is movably provided in the matching groove (11).

3. The ejection mechanism of a two-color injection mold according to claim 1, characterized in that: The first ejector plate group and the second ejector plate group are both provided with a straight ejector body (12), and the straight ejector body (12) is slidably provided on the mold body (1).

4. The ejection mechanism of a two-color injection mold according to claim 1, characterized in that: When the product is formed, one end of the forming portion (14) is located in the mold cavity (2), and the other end is located in the ejection portion (13).

5. The ejection mechanism of a two-color injection mold according to claim 4, characterized in that: The second ejector plate group is located below the first ejector plate group.

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