Double-color injection mold for automobile tail lampshade

Abstract

The double-color injection mold comprises a fixed mold, a movable mold and an ejection mechanism, a pressing block is arranged on the periphery, corresponding to a first cavity and a second cavity, of a female mold, the pressing block is connected to the female mold in a sliding mode, an inwards-concave driving groove is formed in the pressing block, a first driving block matched with the driving groove is arranged at the position, corresponding to the first cavity, of a male mold, and a second driving block matched with the driving groove is arranged at the position, corresponding to the second cavity, of the male mold. When the first driving block is matched with the driving groove, the pressing block is driven to move to press the peripheral edge part of the primary injection molding product, when the second driving block is matched with the pressing block, the pressing block is driven to move outwards to be separated from the peripheral edge part of the primary injection molding product, and a bearing piece used for bearing and abutting against the primary injection molding product is arranged on the periphery, corresponding to the second cavity, of the male die. The bearing piece bears and abuts against the primary injection molding product before the pressing block is separated, the outer periphery of the primary injection molding product is pressed in the female die through the pressing block, the pressing block and the bearing piece are combined for use, it is ensured that the primary injection molding product is always pressed in the female die in the period of switching to the second injection molding, and the injection molding quality and effect are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of molds, and in particular to a two-color injection mold for automotive taillight covers. Background Technology

[0002] Automotive taillight covers are plastic products and are mainly injection molded using automotive injection molds. Due to the high requirements for the flatness of the surface of automotive taillight covers, inverted injection molds are currently commonly used for injection molding. Inverted molds mainly include a fixed mold, a moving mold, and an ejection mechanism. The ejection mechanism and gate system of the inverted mold are set on the fixed mold, so that the ejection mechanism contacts the non-appearance surface of the product when ejecting, thus avoiding ejection defects on the appearance surface of the product.

[0003] Some automotive taillight covers have two colors, for example, the taillight cover body is one color and the outer frame of the taillight cover is another color. For injection molding of such products, a two-color injection mold is usually required. A two-color injection mold includes two symmetrical cavities, each corresponding to a different color of plastic. After the injection of one color plastic is completed, the first color plastic part is transferred to the other cavity for secondary injection molding by rotation. However, in the two-color injection molding process of automotive taillight covers, because it uses an inverted injection method and the mold is usually horizontal, the first color plastic part will remain in the moving mold (cavity) after the mold is opened. During the rotation and switching of the moving mold, the first color plastic part is prone to loosening, which will affect the subsequent secondary injection molding effect and ultimately affect the quality of the injection molded product. Further improvement is needed. Summary of the Invention

[0004] In order to further reduce product loosening during the rotation of the moving mold and improve the final injection molding quality, this application provides a two-color injection mold for automotive taillight covers.

[0005] This application provides a two-color injection mold for automotive taillight covers, employing the following technical solution: A two-color injection mold for automotive taillight covers includes a fixed mold, a moving mold, and an ejection mechanism. The ejection mechanism is mounted on the fixed mold. A punch is mounted on the fixed mold, and a die is mounted on the moving mold. When the fixed mold and the moving mold are closed, they form a first cavity and a second cavity for injection molding. A pressure block is mounted on the outer periphery of the die corresponding to the first and second cavities. The pressure block is slidably connected to the die and has an inwardly recessed drive groove. A first drive block is mounted on the punch corresponding to the first cavity and engages with the drive groove. When the first drive block engages with the drive groove, it drives the pressure block to move and press against the outer periphery of the primary injection molded product. A second drive block is mounted on the punch corresponding to the second cavity and engages with the drive groove. When the second drive block engages with the pressure block, it drives the pressure block to move outward and disengage from the outer periphery of the primary injection molded product. A receiving member is mounted on the outer periphery of the punch corresponding to the second cavity to receive and press against the primary injection molded product. The receiving member receives and presses against the primary injection molded product before the pressure block disengages.

[0006] Optionally, the receiving component includes a receiving rod, and the ejection mechanism includes a top plate and an ejector rod. The receiving rod is elastically connected to the fixed mold, and a linkage component is provided between the receiving rod and the top plate to link the two. During the ejection of the ejector rod, the receiving rod and the top plate are linked, and after the ejector rod completes ejection, the receiving rod and the top plate are disengaged.

[0007] Optionally, the linkage includes a linkage block slidably connected to the top plate. The receiving rod has a stepped groove, and the top plate is provided with a return spring that drives the linkage block to slide into the stepped groove. The linkage block has a through hole, and the fixed mold is provided with a guide post corresponding to the through hole. The guide post is used to pass into the through hole, and the guide post and the inner wall of the through hole are provided with matching wedge-shaped surfaces. During the upward movement of the top plate, the guide post is inserted into the through hole to drive the linkage block to disengage from the stepped groove.

[0008] Optionally, the bottom of the fixed mold is provided with a base plate, and a fixed mold base is fixed on the base plate. A compression spring is provided on the fixed mold base corresponding to the receiving rod, and the compression spring is used to drive the receiving rod to push out.

[0009] Optionally, both the first and second driving blocks are conical trapezoids with guide surfaces on both sides, and the driving groove on the pressure block has a driving surface that matches the guide surface.

[0010] Optionally, multiple pressure blocks are distributed at intervals around the outer periphery of the first cavity and the second cavity, and the top rod and the receiving rod are alternately distributed on the outer periphery of the second cavity.

[0011] Optionally, the guide post is slidably and adjustablely mounted on the fixed mold, and the sliding direction of the guide post is closer to or further away from the stepped groove.

[0012] Optionally, the fixed mold is provided with a sliding groove for the guide post to slide, the guide post is provided with a fixing screw, the bottom wall of the guide post and the sliding groove are provided with corresponding screw holes that cooperate with the fixing screw, and the top plate is provided with a clearance hole to avoid the guide post at the corresponding through hole, the diameter of the clearance hole is larger than the diameter of the through hole.

[0013] Optionally, the guide pillars and the receiving rods are arranged in a one-to-one correspondence, and a linkage component is provided between the guide pillars of adjacent receiving rods to adjust their opposite movement. The fixed mold is provided with a drive source to drive the guide pillars to move and adjust.

[0014] Optionally, the driving source includes a hydraulic cylinder, the output end of which is provided with a moving block, and the linkage includes a connecting rod, which is symmetrically arranged on both sides of the moving block. One end of the connecting rod is hinged to the moving block, and the other end is hinged to the guide post.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. After the first injection molding is completed and the mold is opened in the first cavity, the outer periphery of the first injection molded product is pressed into the cavity by the pressure block. This effectively prevents the first injection molded product from shifting or loosening during the rotation and switching of the moving mold. During the second injection molding process, the second drive block cooperates with the drive groove on the pressure block to drive each pressure block to gradually move outward and no longer press against the outer periphery of the first injection molded product. This ensures that the subsequent pressure blocks will not affect the subsequent second injection molding to form the frame around the outer periphery of the first injection molded product. During the outward movement of the pressure block, the receiving part on the punch presses against the first injection molded product to prevent the first injection molded product from shifting or loosening after the pressure block moves outward. Ultimately, this ensures that the product is always pressed into the cavity and will not move during the transition from the first injection molding to the second injection molding, thus effectively improving the injection molding quality and molding effect. 2. After secondary injection molding, when the top plate rises and drives the ejector pins to move upwards to eject the product, the linkage block is located in the stepped groove. During the upward movement of the top plate, the receiving rod moves upwards synchronously to eject the product. After the top plate reaches its limit position, the guide post inserts into the through hole, driving the linkage block to move out of the stepped groove. At this time, the receiving rod is no longer blocked by the linkage block and will move further upwards under the action of the compression spring to eject the product, making the injection molded product further ejected, facilitating subsequent material removal. When the top plate moves back to its original position, the receiving rod is no longer linked with it, and at this time the receiving rod... The top of the rod remains in the ejected receiving state. After the moving mold completes the first injection molding and rotates for the second injection molding, the receiving rod, which is in the ejected state during the mold closing period, can press against the injection molded product once before the pressure block moves outward and disengages from the pressure block. This achieves pre-positioned pressure and avoids the situation where the first injection molded product becomes loose or shifted due to the pressure block moving outward and disengaging from the pressure block during the mold closing period, which would affect the injection molding quality and effect. This realizes the multi-purpose function of the receiving rod. After the second injection molding is completed and the mold is closed, the receiving rod is pressed down and returned to its initial state, and the linkage block moves back into the step groove. 3. The guide post can be adjusted according to actual needs. When the receiving rod does not need to be in the ejected state to receive and press the injection molded product in advance, the position of the guide post can be moved and adjusted towards the stepped groove so that the wedge-shaped surface of the guide post will not drive the linkage block to slide out of the stepped groove during the upward movement of the top plate. At this time, the receiving rod and the ejector rod on the top plate are always in a synchronous lifting state. In this way, the receiving rod can be used as a regular ejector rod. During use, the compression spring can play an auxiliary lifting role when the top plate moves upward and out, and the compression spring plays a certain buffering role when the top plate moves downward and resets. This makes it easy to switch the use state of the receiving rod, and the switching operation is simple and convenient. Attached Figure Description

[0016] Figure 1 This is an overall structural diagram of Example 1.

[0017] Figure 2 This is a three-dimensional view of the moving model in Example 1.

[0018] Figure 3 This is a front view of the moving mold at the die in Example 1.

[0019] Figure 4 This is a schematic diagram of the structure of the injection-molded product and the compression block in Example 1.

[0020] Figure 5 This is a three-dimensional view of the mold in Example 1.

[0021] Figure 6 yes Figure 5 Enlarged view of point A in the middle.

[0022] Figure 7 This is a front view of the fixed mold at the punch in Example 1.

[0023] Figure 8 yes Figure 7 Sectional view at point BB.

[0024] Figure 9 yes Figure 8 A magnified view of point C in the middle.

[0025] Figure 10 yes Figure 8 Enlarged view of point D in the middle.

[0026] Figure 11 This is a partial cross-sectional view of the receiving rod in Embodiment 2.

[0027] Figure 12 This is a schematic diagram of the connection structure between adjacent guide posts in Example 3.

[0028] Explanation of reference numerals in the attached figures: 1. Fixed mold; 2. Moving mold; 3. Cavity mold; 4. Gate; 5. One-time injection molded product; 6. Pressure block; 7. Guide seat; 8. Guide groove; 9. Drive groove; 10. First drive block; 11. Second drive block; 12. First punch; 13. Second punch; 14. Guide surface; 15. Drive surface; 16. Support rod; 17. Ejector plate; 18. Ejector rod; 19. Base plate; 20. Compression spring; 21. Linkage block; 22. Step groove; 23. Return spring; 24. Through hole; 25. Guide post; 26. Wedge-shaped surface; 27. Slide groove; 28. Fixing screw; 29. ​​Screw hole; 30. Clearance hole; 31. Hydraulic cylinder; 32. Moving block; 33. Connecting rod; 34. Fixed mold base. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-12 This application will be described in further detail.

[0030] Example 1: A two-color injection mold for automotive taillight covers, such as... Figures 1-5 As shown, the system includes a fixed mold 1, a moving mold 2, and an ejection mechanism. The ejection mechanism is mounted on the fixed mold 1 and is used to eject the final product after injection molding. In actual use, the moving mold 2 has a power source that drives the moving mold 2 to open, close, and rotate. A punch is mounted on the fixed mold 1, and a die 3 is mounted on the moving mold 2. After the fixed mold 1 and the moving mold 2 are closed, a cavity for injection molding is formed between the punch and the die 3. The fixed mold 1 has a gate 4 that communicates with the cavity. In this embodiment, the cavity includes a first cavity and a second cavity. There are two symmetrically arranged first cavities and two symmetrically arranged second cavities, which allows two products to be injection molded at once. The first cavity is used to injection mold a single injection product 5, and the second cavity is used to injection mold a border of different colors around the outer periphery of the single injection product 5. The single injection product 5 is the taillight cover body, and the second injection product is... The molded product is the outer circumference frame of the taillight cover. There are two gates 4, which correspond to the first cavity and the second cavity respectively. In the actual injection molding process, the moving mold 2 is driven to close with the fixed mold 1, and then injection molding is performed into the first cavity to obtain the first injection molded product 5 located in the first cavity. Then the mold is opened, at which time the first injection molded product 5 is located in the cavity 3 of the moving mold 2. The moving mold 2 is then driven to rotate 180 degrees, so that the cavity 3 with the first injection molded product 5 corresponds to another set of punches on the fixed mold 1. The mold is closed again for injection molding. The second injection molding is performed in the second cavity to mold the frame, which is located on the outer circumference of the first injection molded product 5. After completion, the mold is opened and the product is ejected with the help of the ejection mechanism to realize the dual-color injection molding of the car taillight cover. Multiple products are molded in one injection, and the rotation of the moving mold 2 is combined to realize the simultaneous injection molding of the first cavity and the second cavity, which effectively improves production efficiency.

[0031] like Figures 2-4As shown, a pressure block 6 is provided on the outer periphery of the cavity corresponding to the cavity of the die 3. The pressure blocks 6 are evenly distributed around the outer periphery of the cavity. In this embodiment, the pressure blocks 6 are slidably connected to the die 3. The sliding direction of the pressure blocks 6 is towards the inside of the cavity. The pressure blocks 6 are used to press the first injection molded product 5 formed in the first cavity. The pressure blocks 6 are used to prevent the first injection molded product 5 from being displaced or loosened during the rotation of the moving mold 2 after the mold is opened.

[0032] like Figures 4-6 As shown, a guide seat 7 is provided at the bottom of the pressure block 6, and the guide seat 7 is fixed on the die 3. The guide seat 7 has a guide groove 8 for the pressure block 6 to slide. A recessed drive groove 9 is provided on the top wall of the pressure block 6. At the same time, a drive block corresponding to the drive groove 9 on the pressure block 6 is provided on the punch. The drive block includes a first drive block 10 and a second drive block 11. The punch includes a first punch 12 and a second punch 13. The first punch 12 forms a first cavity after being molded with the die 3, and the second punch 13 forms a second cavity after being molded with the die 3. The first drive block 10 is provided on the first punch 12, and the second drive block 11 is provided on the second punch 13. Both are conical trapezoidal shapes with guide surfaces 14 on both sides. The pressure block 6 has a driving surface 15 that matches the guide surface 14. During the first injection molding mold closing, the first driving block 10 cooperates with the driving groove 9 of the pressure block 6 on the cavity mold 3. With the help of the fit between the guide surface 14 and the driving surface 15, the pressure block 6 is driven to move to press the outer periphery of the first injection molded product 5. In this way, after the mold is opened, the first injection molded product 5 remains in the cavity mold 3 and is pressed by the pressure block 6 on the outer periphery. This effectively avoids the phenomenon of displacement or loosening of the first injection molded product 5 in the cavity mold 3 when the mold is opened and the moving mold 2 rotates to switch positions. This ensures that the first injection molded product 5 can be stably located in the cavity mold 3.

[0033] like Figure 7 As shown, in this embodiment, the second driving block 11 and the first driving block 10 are in different positions relative to the cavity. When the moving mold 2 rotates and drives the first injection molded product 5 to correspond with the second punch 13, the mold closes. During this period, the second driving block 11 cooperates with the driving groove 9 on the pressure block 6 to gradually drive each pressure block 6 to move outward and separate from the outer periphery of the first injection molded product 5. This achieves synchronous outward movement and avoidance of each pressure block 6 during the mold closing period, avoiding the situation where the pressure block 6 blocks the obstruction and interference when the outer periphery of the first injection molded product 5 is injected during the subsequent secondary injection. It automatically achieves synchronous outward movement and avoidance of all pressure blocks 6, with a simple structure and no other additional operations required.

[0034] like Figures 7-10As shown, a receiving component is provided on the outer periphery of the second cavity corresponding to the second punch 13 to receive and press the first injection molded product 5. During the mold closing process of the second injection, the receiving component presses the first injection molded product 5 before the pressure block 6 moves outward and separates. With the help of the design of the receiving component, the receiving component on the fixed mold 1 can replace the pressure block 6 to press the first injection molded product 5 in advance during the mold closing period, so as to avoid the first injection molded product 5 from being displaced or loosened in a short period of time due to the pressure block 6 moving outward and separating during the mold closing period. The receiving component plays the role of taking over the pressure block 6 to press the first injection molded product 5.

[0035] like Figures 7-10 As shown, the receiving component includes a receiving rod 16, and the ejection mechanism includes a top plate 17 and ejector rods 18. Multiple ejector rods 18 are provided and fixed on the top plate 17. The top end of the ejector rod 18 corresponds to the outer periphery of the second cavity. The top plate 17 is lifted and connected to the fixed mold 1. In actual use, the top plate 17 is lifted and connected by a hydraulic cylinder to achieve the ejection of the final injection molded product. The receiving rod 16 is elastically connected to the fixed mold 1. A linkage component is provided between the receiving rod 16 and the ejector rod 18 to move upward and eject synchronously. During the ejection of the ejector rod 18, the receiving rod 16 and the top plate 17 are linked. After the ejector rod 18 is completely ejected, the receiving rod 16 and the top plate 17 are disengaged.

[0036] like Figures 7-10 As shown, a base plate 19 is provided at the bottom of the fixed mold 1, and a fixed mold base 34 is fixed on the base plate 19. A compression spring 20 is provided on the fixed mold base 34 corresponding to the receiving rod 16. The compression spring 20 is used to drive the receiving rod 16 to move upward and be ejected. The linkage component includes a linkage block 21, which is slidably connected to the top plate 17. The sliding direction of the linkage block 21 is perpendicular to the ejection direction of the receiving rod 16. The receiving rod 16 has a stepped groove 22. At the same time, a return spring 23 is provided on the top plate 17 to drive the linkage block 21 to slide into the stepped groove 22. A through hole 24 is provided on the linkage block 21. The through hole 24 is oriented in the same direction as the lifting direction of the top plate 17. The fixed mold 1 is provided with a guide post 25 corresponding to the through hole 24. The guide post 25 is fixed to the fixed mold 1 by screws. When the top plate 17 rises and drives the ejector rod 18 to eject, the guide post 25 is inserted into the through hole 24. The guide post 25 and the inner wall of the through hole 24 are provided with matching wedge-shaped surfaces 26. During the ejection process of the top plate 17 moving upward, the guide post 25 is inserted into the through hole 24 and drives the linkage block 21 to gradually disengage from the step groove 22. When the top plate 17 drives the ejector rod 18 to complete the ejection action, the linkage block 21 disengages from the step groove 22.

[0037] When the top plate 17 rises, driving the ejector rod 18 to eject, initially, because the linkage block 21 is located within the stepped groove 22, the receiving rod 16 moves upward synchronously under the action of the compression spring 20 during the rise of the top plate 17. At this time, the receiving rod 16 and the ejector rod 18 maintain the same ejection state. When the top plate 17 rises to the ejection limit position, the guide post 25 drives the linkage block 21 to disengage from the stepped groove 22. At this time, the linkage block 21 no longer presses against the receiving rod 16, and the receiving rod 16 will move further upward under the action of the compression spring 20. At this time, the top of the receiving rod 16 will be slightly higher than the top of the ejector rod 18. Thus, during the ejection, the receiving rod 16 can help the injection molded product to be further ejected, making subsequent material removal easier and achieving a better ejection and material removal effect. When the top plate 17 moves back to its original position, the receiving rod 16 is not linked with it. When the top of the receiving rod 16 is still in the ejected receiving state, after the moving mold 2 completes the first injection molding and rotates to perform the second injection molding, the receiving rod 16, which is in the ejected state during the mold closing period, can press the first injection product 5 before the pressure block 6 moves outward and disengages from the pressure block. This achieves the pre-positioned pressure, and the pressure block 6 takes over to press the first injection product 5. This avoids the situation where the first injection product 5 becomes loose or shifts due to the pressure block 6 moving outward and disengaging from the pressure block during the mold closing period, which would affect the injection quality and effect. This realizes the multi-purpose function of the receiving rod 16. After the second injection molding is completed, the receiving rod 16 gradually moves down and retracts to the initial state under the downward pressure of the moving mold 2. The guide post 25 is disengaged from the through hole 24 of the linkage block 21. Under the action of the return spring 23, the linkage block 21 is re-engaged into the step groove 22, so that the receiving rod 16 returns to the initial state.

[0038] like Figure 7 As shown, in this embodiment, the ejector rod 18 and the receiving rod 16 are alternately distributed on the outer periphery of the second cavity, which makes the ejector rod 18 and the receiving rod 16 more evenly distributed. The ejection stage can stably eject the molded product, and the relay stage can stably press against various areas on the outer periphery of the injection molded product 5, ultimately achieving a more stable ejection effect and a more stable receiving and pressing effect. In this embodiment, there are 4 receiving rods 16, which are symmetrically distributed on both sides of the second cavity.

[0039] The working principle of this embodiment is as follows: During the first injection molding, the moving mold 2 moves to close the mold, and the first raw material is injected from the gate 4 into the first cavity. The injection molding produces a first-injection molded product 5. Then, the moving mold 2 moves to open the mold. At this time, the first-injection molded product 5 is located in the cavity 3 of the moving mold 2 and is pressed by the pressure block 6 to prevent the first-injection molded product 5 from loosening. The moving mold 2 rotates 180 degrees so that the cavity 3 with the first-injection molded product 5 corresponds to the second punch 13, and the mold closes again. During the mold closing, the receiving rod 16 will first press against the first-injection molded product 5. The pressure block 6 gradually moves outward and releases from pressing against the first-injection molded product 5 during the mold closing. After the mold closing is completed, the second raw material is injected from another gate 4 into the second cavity. The second cavity forms a frame around the outer periphery of the first-injection molded product 5. The frame and the first-injection molded product 5 form an integral two-color car taillight cover. Finally, after the mold is opened, the completed injection molded product, the two-color car taillight cover, is ejected.

[0040] Example 2: A two-color injection mold for automotive taillight covers, such as... Figure 11 As shown, the main difference between this and embodiment 1 is that the guide post 25 is slidably adjustable on the fixed mold 1, and the sliding adjustment direction of the guide post 25 is closer to or further away from the stepped groove 22; a sliding groove 27 for the guide post 25 to slide is provided on the fixed mold 1, the cross section of the sliding groove 27 is T-shaped or dovetail-shaped, a fixing screw 28 is provided on the guide post 25, and corresponding screw holes 29 that cooperate with the fixing screw 28 are provided on the bottom wall of the guide post 25 and the sliding groove 27; a clearance hole 30 is provided on the top plate 17 at the corresponding through hole 24 to avoid the guide post 25, and the diameter of the clearance hole 30 is larger than the diameter of the through hole 24.

[0041] In this way, the guide post 25 can be adjusted according to actual needs. When the receiving rod 16 does not need to be in the ejected state to receive and press the injection molded product 5 in advance, the fixing screw 28 is loosened. During the upward movement of the top plate 17, the linkage block 21 will drive the guide post 25 to move towards the stepped groove 22 under the action of the return spring 23 to achieve adjustment. At this time, the linkage block 21 is always located in the stepped groove 22. The receiving rod 16 and the push rod 18 on the top plate 17 are always in a synchronous lifting state. In this way, the receiving rod 16 can be used as a normal push rod 18. During use, the compression spring 20 can play an auxiliary lifting role when the top plate 17 moves upward and ejects. When the top plate 17 moves downward and resets, the compression spring 20 plays a certain buffering role. The switching of the use state of the receiving rod 16 is simple and convenient. The movement adjustment operation of the guide post 25 is also simple. Just loosen the fixing screw 28. When it is necessary to fix the position of the guide post 25, just slide the guide post 25 to the corresponding position of the screw hole 29 and then tighten the fixing screw 28.

[0042] Example 3: A two-color injection mold for automotive taillight covers, such as... Figure 12As shown, the main difference between this embodiment and Embodiment 2 is that a linkage component is provided between the guide posts 25 of adjacent receiving rods 16 to move them in opposite directions. In this embodiment, the receiving rods 16 are no longer fixed by fixing screws 28. A drive source is provided on the fixed mold 1 to drive the guide posts 25 to move and adjust. The drive source includes a hydraulic cylinder 31, and a moving block 32 is provided at the output end of the hydraulic cylinder 31. The linkage component includes a connecting rod 33, which is symmetrically arranged on both sides of the moving block 32. One end of the connecting rod 33 is hinged to the moving block 32, and the other end is hinged to the guide post 25. In this way, the hydraulic cylinder 31 drives the moving block 32 to rise and fall, and the connecting rod 33 drives the two adjacent guide posts 25 to move in opposite directions and adjust synchronously. This realizes the switching of the position state of the guide posts 25, so that the receiving rods 16 can switch the usage state according to actual needs. The adjustment operation of the guide posts 25 is simpler, and the mold as a whole can meet the needs of more injection molding occasions, and has better practicality and applicability.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A two-color injection mold for automotive taillight covers, characterized in that: The mold includes a fixed mold (1), a moving mold (2), and an ejection mechanism. The ejection mechanism is mounted on the fixed mold (1). The fixed mold (1) has a punch, and the moving mold (2) has a cavity (3). When the fixed mold (1) and the moving mold (2) are closed, they form a first cavity and a second cavity for injection molding. The cavity (3) has a pressure block (6) on its outer periphery corresponding to the first cavity and the second cavity. The pressure block (6) is slidably connected to the cavity (3). The pressure block (6) has an inwardly recessed drive groove (9). The punch has a first drive block that mates with the drive groove (9) at the location corresponding to the first cavity. (10) When the first driving block (10) cooperates with the driving groove (9), it drives the pressure block (6) to move to press the outer periphery of the first injection molded product (5). The punch is provided with a second driving block (11) that cooperates with the driving groove (9) at the second cavity. When the second driving block (11) cooperates with the pressure block (6), it drives the pressure block (6) to move outward and disengage from the contact with the outer periphery of the first injection molded product (5). The punch is provided with a receiving member for receiving and pressing the first injection molded product (5) at the outer periphery of the second cavity. The receiving member receives and presses the first injection molded product (5) before the pressure block (6) disengages.

2. The dual-color injection mold for an automotive taillight cover according to claim 1, characterized in that: The receiving component includes a receiving rod (16), and the ejection mechanism includes a top plate (17) and an ejector rod (18). The receiving rod (16) is elastically connected to the fixed mold (1). A linkage component is provided between the receiving rod (16) and the top plate (17) to link the two. During the ejection of the ejector rod (18), the receiving rod (16) and the top plate (17) are linked. After the ejector rod (18) completes ejection, the receiving rod (16) and the top plate (17) are disengaged.

3. The dual-color injection mold for an automotive taillight cover according to claim 2, characterized in that: The linkage component includes a linkage block (21), which is slidably connected to the top plate (17). The receiving rod (16) has a stepped groove (22). The top plate (17) is provided with a return spring (23) that drives the linkage block (21) to slide into the stepped groove (22). The linkage block (21) has a through hole (24). The fixed mold (1) is provided with a guide post (25) corresponding to the through hole (24). The guide post (25) is used to penetrate into the through hole (24). The guide post (25) and the inner wall of the through hole (24) are provided with matching wedge-shaped surfaces (26). During the upward movement of the top plate (17), the guide post (25) is inserted into the through hole (24) to drive the linkage block (21) to disengage from the stepped groove (22).

4. The dual-color injection mold for an automotive taillight cover according to claim 2, characterized in that: The bottom of the fixed mold (1) is provided with a base plate (19), and a fixed mold base (34) is fixed on the base plate (19). A compression spring (20) is provided on the fixed mold base (34) corresponding to the receiving rod (16). The compression spring (20) is used to drive the receiving rod (16) to push out.

5. The dual-color injection mold for an automotive taillight cover according to claim 1, characterized in that: The first driving block (10) and the second driving block (11) are both conical trapezoids and have guide surfaces (14) on both sides. The driving groove (9) on the pressure block (6) has a driving surface (15) that matches the guide surface (14).

6. The dual-color injection mold for an automotive taillight cover according to claim 3, characterized in that: Multiple pressure blocks (6) are distributed at intervals around the outer periphery of the first cavity and the second cavity, and the top rod (18) and the receiving rod (16) are alternately distributed around the outer periphery of the second cavity.

7. A two-color injection mold for an automotive taillight cover according to claim 6, characterized in that: The guide post (25) is slidably and adjustablely disposed on the fixed mold (1), and the sliding direction of the guide post (25) is closer to or further away from the step groove (22).

8. The dual-color injection mold for an automotive taillight cover according to claim 7, characterized in that: The fixed mold (1) is provided with a sliding groove (27) for sliding the guide post (25). A fixing screw (28) is provided on the guide post (25). The bottom wall of the guide post (25) and the sliding groove (27) are provided with corresponding screw holes (29) that cooperate with the fixing screw (28). The top plate (17) is provided with a clearance hole (30) for avoiding the guide post (25) at the corresponding through hole (24). The diameter of the clearance hole (30) is larger than the diameter of the through hole (24).

9. A two-color injection mold for an automotive taillight cover according to claim 7, characterized in that: The guide post (25) and the receiving rod (16) are arranged in a one-to-one correspondence. A linkage component is provided between the guide post (25) of the adjacent receiving rod (16) to adjust their opposite movement. The fixed mold (1) is provided with a drive source to drive the guide post (25) to move and adjust.

10. A two-color injection mold for an automotive taillight cover according to claim 9, characterized in that: The driving source includes a hydraulic cylinder (31), and a moving block (32) is provided at the output end of the hydraulic cylinder (31). The linkage includes a connecting rod (33), which is symmetrically arranged on both sides of the moving block (32). One end of the connecting rod (33) is hinged to the moving block (32), and the other end is hinged to the guide post (25).

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